Add ALSA, improve OSS and remove OSS4

38 files changed, 5450 insertions, 2295 deletions

diff --git a/backends/Makefile.am b/backends/Makefile.am
index 0cf8dd4..4a8afff 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -8,12 +8,12 @@ if HAVE_PULSEAUDIO
 SUBDIRS += pulse
 endif
 
-if HAVE_OSS
-SUBDIRS += oss
+if HAVE_ALSA
+SUBDIRS += alsa
 endif
 
-if HAVE_OSS4
-SUBDIRS += oss4
+if HAVE_OSS
+SUBDIRS += oss
 endif
 
 -include $(top_srcdir)/git.mk
diff --git a/backends/alsa/Makefile.am b/backends/alsa/Makefile.am
new file mode 100644
index 0000000..220bb3b
--- /dev/null
+++ b/backends/alsa/Makefile.am
@@ -0,0 +1,47 @@
+backenddir = $(libdir)/libmatemixer
+
+backend_LTLIBRARIES = libmatemixer-alsa.la
+
+AM_CPPFLAGS =                                                   \
+        -I$(top_srcdir)                                         \
+        -DG_LOG_DOMAIN=\"libmatemixer-alsa\"
+
+libmatemixer_alsa_la_CFLAGS =                                   \
+        $(GLIB_CFLAGS)                                          \
+        $(ALSA_CFLAGS)
+
+libmatemixer_alsa_la_SOURCES =                                  \
+        alsa-backend.c                                          \
+        alsa-backend.h                                          \
+        alsa-constants.c                                        \
+        alsa-constants.h                                        \
+        alsa-device.c                                           \
+        alsa-device.h                                           \
+        alsa-element.c                                          \
+        alsa-element.h                                          \
+        alsa-stream.c                                           \
+        alsa-stream.h                                           \
+        alsa-stream-control.c                                   \
+        alsa-stream-control.h                                   \
+        alsa-stream-input-control.c                             \
+        alsa-stream-input-control.h                             \
+        alsa-stream-output-control.c                            \
+        alsa-stream-output-control.h                            \
+        alsa-switch.c                                           \
+        alsa-switch.h                                           \
+        alsa-switch-option.c                                    \
+        alsa-switch-option.h                                    \
+        alsa-toggle.c                                           \
+        alsa-toggle.h
+
+libmatemixer_alsa_la_LIBADD =                                   \
+        $(GLIB_LIBS)                                            \
+        $(ALSA_LIBS)
+
+libmatemixer_alsa_la_LDFLAGS =                                  \
+        -avoid-version                                          \
+        -no-undefined                                           \
+        -export-dynamic                                         \
+        -module
+
+-include $(top_srcdir)/git.mk
diff --git a/backends/alsa/alsa-backend.c b/backends/alsa/alsa-backend.c
new file mode 100644
index 0000000..7a17b85
--- /dev/null
+++ b/backends/alsa/alsa-backend.c
@@ -0,0 +1,508 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-backend.h"
+#include "alsa-device.h"
+#include "alsa-stream.h"
+
+#define BACKEND_NAME      "ALSA"
+#define BACKEND_PRIORITY  9
+
+struct _AlsaBackendPrivate
+{
+    GSource    *timeout_source;
+    GHashTable *devices;
+    GHashTable *devices_ids;
+};
+
+static void alsa_backend_class_init     (AlsaBackendClass *klass);
+static void alsa_backend_class_finalize (AlsaBackendClass *klass);
+static void alsa_backend_init           (AlsaBackend      *alsa);
+static void alsa_backend_dispose        (GObject          *object);
+static void alsa_backend_finalize       (GObject          *object);
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+G_DEFINE_DYNAMIC_TYPE (AlsaBackend, alsa_backend, MATE_MIXER_TYPE_BACKEND)
+#pragma clang diagnostic pop
+
+static gboolean alsa_backend_open            (MateMixerBackend *backend);
+static void     alsa_backend_close           (MateMixerBackend *backend);
+static GList *  alsa_backend_list_devices    (MateMixerBackend *backend);
+static GList *  alsa_backend_list_streams    (MateMixerBackend *backend);
+
+static gboolean read_devices                 (AlsaBackend      *alsa);
+
+static gboolean read_device                  (AlsaBackend      *alsa,
+                                              const gchar      *card);
+
+static void     add_device                   (AlsaBackend      *alsa,
+                                              AlsaDevice       *device);
+
+static void     remove_device                (AlsaBackend      *alsa,
+                                              AlsaDevice       *device);
+static void     remove_stream                (AlsaBackend      *alsa,
+                                              const gchar      *name);
+
+static void     select_default_input_stream  (AlsaBackend      *alsa);
+static void     select_default_output_stream (AlsaBackend      *alsa);
+
+static MateMixerBackendInfo info;
+
+void
+backend_module_init (GTypeModule *module)
+{
+    alsa_backend_register_type (module);
+
+    info.name         = BACKEND_NAME;
+    info.priority     = BACKEND_PRIORITY;
+    info.g_type       = ALSA_TYPE_BACKEND;
+    info.backend_type = MATE_MIXER_BACKEND_ALSA;
+}
+
+const MateMixerBackendInfo *backend_module_get_info (void)
+{
+    return &info;
+}
+
+static void
+alsa_backend_class_init (AlsaBackendClass *klass)
+{
+    GObjectClass          *object_class;
+    MateMixerBackendClass *backend_class;
+
+    object_class = G_OBJECT_CLASS (klass);
+    object_class->dispose  = alsa_backend_dispose;
+    object_class->finalize = alsa_backend_finalize;
+
+    backend_class = MATE_MIXER_BACKEND_CLASS (klass);
+    backend_class->open         = alsa_backend_open;
+    backend_class->close        = alsa_backend_close;
+    backend_class->list_devices = alsa_backend_list_devices;
+    backend_class->list_streams = alsa_backend_list_streams;
+
+    g_type_class_add_private (object_class, sizeof (AlsaBackendPrivate));
+}
+
+/* Called in the code generated by G_DEFINE_DYNAMIC_TYPE() */
+static void
+alsa_backend_class_finalize (AlsaBackendClass *klass)
+{
+}
+
+static void
+alsa_backend_init (AlsaBackend *alsa)
+{
+    alsa->priv = G_TYPE_INSTANCE_GET_PRIVATE (alsa,
+                                             ALSA_TYPE_BACKEND,
+                                             AlsaBackendPrivate);
+
+    alsa->priv->devices = g_hash_table_new_full (g_str_hash,
+                                                 g_str_equal,
+                                                 g_free,
+                                                 g_object_unref);
+
+    alsa->priv->devices_ids = g_hash_table_new_full (g_str_hash,
+                                                     g_str_equal,
+                                                     g_free,
+                                                     NULL);
+}
+
+static void
+alsa_backend_dispose (GObject *object)
+{
+    MateMixerBackend *backend;
+    MateMixerState    state;
+
+    backend = MATE_MIXER_BACKEND (object);
+
+    state = mate_mixer_backend_get_state (backend);
+    if (state != MATE_MIXER_STATE_IDLE)
+        alsa_backend_close (backend);
+
+    G_OBJECT_CLASS (alsa_backend_parent_class)->dispose (object);
+}
+
+static void
+alsa_backend_finalize (GObject *object)
+{
+    AlsaBackend *alsa;
+
+    alsa = ALSA_BACKEND (object);
+
+    g_hash_table_unref (alsa->priv->devices);
+    g_hash_table_unref (alsa->priv->devices_ids);
+
+    G_OBJECT_CLASS (alsa_backend_parent_class)->finalize (object);
+}
+
+static gboolean
+alsa_backend_open (MateMixerBackend *backend)
+{
+    AlsaBackend *alsa;
+
+    g_return_val_if_fail (ALSA_IS_BACKEND (backend), FALSE);
+
+    alsa = ALSA_BACKEND (backend);
+
+    /* Poll ALSA for changes every 500 milliseconds, this actually only
+     * discovers added or changed sound cards, sound card related events
+     * are handled by AlsaDevices */
+    alsa->priv->timeout_source = g_timeout_source_new_seconds (1);
+    g_source_set_callback (alsa->priv->timeout_source,
+                           (GSourceFunc) read_devices,
+                           alsa,
+                           NULL);
+    g_source_attach (alsa->priv->timeout_source,
+                     g_main_context_get_thread_default ());
+
+    /* Read the initial list of devices so we have some starting point, there
+     * isn't really a way to detect errors here, failing to add a device may
+     * be a device-related problem so make the backend always open successfully */
+    read_devices (alsa);
+
+    _mate_mixer_backend_set_state (backend, MATE_MIXER_STATE_READY);
+    return TRUE;
+}
+
+void
+alsa_backend_close (MateMixerBackend *backend)
+{
+    AlsaBackend *alsa;
+
+    g_return_if_fail (ALSA_IS_BACKEND (backend));
+
+    alsa = ALSA_BACKEND (backend);
+
+    g_source_destroy (alsa->priv->timeout_source);
+
+    g_hash_table_remove_all (alsa->priv->devices);
+    g_hash_table_remove_all (alsa->priv->devices_ids);
+
+    _mate_mixer_backend_set_state (backend, MATE_MIXER_STATE_IDLE);
+}
+
+static GList *
+alsa_backend_list_devices (MateMixerBackend *backend)
+{
+    GList *list;
+
+    g_return_val_if_fail (ALSA_IS_BACKEND (backend), NULL);
+
+    /* Convert the hash table to a linked list, this list is expected to be
+     * cached in the main library */
+    list = g_hash_table_get_values (ALSA_BACKEND (backend)->priv->devices);
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+
+    return list;
+}
+
+static GList *
+alsa_backend_list_streams (MateMixerBackend *backend)
+{
+    AlsaBackend   *alsa;
+    GHashTableIter iter;
+    gpointer       value;
+    GList         *list = NULL;
+
+    g_return_val_if_fail (ALSA_IS_BACKEND (backend), NULL);
+
+    alsa = ALSA_BACKEND (backend);
+
+    /* We don't keep a list or hash table of all streams here, instead walk
+     * through the list of devices and create the list manually, each device
+     * has at most one input and one output stream */
+    g_hash_table_iter_init (&iter, alsa->priv->devices);
+
+    while (g_hash_table_iter_next (&iter, NULL, &value)) {
+        AlsaDevice *device = ALSA_DEVICE (value);
+        AlsaStream *stream;
+
+        stream = alsa_device_get_output_stream (device);
+        if (stream != NULL)
+            list = g_list_prepend (list, stream);
+        stream = alsa_device_get_input_stream (device);
+        if (stream != NULL)
+            list = g_list_prepend (list, stream);
+    }
+
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+
+    return list;
+}
+
+static gboolean
+read_devices (AlsaBackend *alsa)
+{
+    gint     num;
+    gint     ret;
+    gchar    card[16];
+    gboolean changed = FALSE;
+
+    /* Read the default device first, it will be either one of the hardware cards
+     * that will be queried later, or a software mixer */
+    if (read_device (alsa, "default") == TRUE)
+        changed = TRUE;
+
+    for (num = -1;;) {
+        /* Read number of the next sound card */
+        ret = snd_card_next (&num);
+        if (ret < 0 ||
+            num < 0)
+            break;
+
+        g_snprintf (card, sizeof (card), "hw:%d", num);
+
+        if (read_device (alsa, card) == TRUE)
+            changed = TRUE;
+    }
+
+    /* If any card has been added, make sure we have the most suitable default
+     * input and output streams */
+    if (changed == TRUE) {
+        select_default_input_stream (alsa);
+        select_default_output_stream (alsa);
+    }
+    return G_SOURCE_CONTINUE;
+}
+
+static gboolean
+read_device (AlsaBackend *alsa, const gchar *card)
+{
+    AlsaDevice          *device;
+    snd_ctl_t           *ctl;
+    snd_ctl_card_info_t *info;
+    const gchar         *id;
+    gint                 ret;
+
+    /* The device may be already known, remove it if it's known and fails
+     * to be read, this happens for example when PulseAudio is killed */
+    device = g_hash_table_lookup (alsa->priv->devices, card);
+
+    ret = snd_ctl_open (&ctl, card, 0);
+    if (ret < 0) {
+        g_warning ("Failed to open ALSA control for %s: %s",
+                   card,
+                   snd_strerror (ret));
+        if (device != NULL)
+            remove_device (alsa, device);
+        return FALSE;
+    }
+
+    snd_ctl_card_info_alloca (&info);
+
+    ret = snd_ctl_card_info (ctl, info);
+    if (ret < 0) {
+        g_warning ("Failed to read card info: %s", snd_strerror (ret));
+        if (device != NULL)
+            remove_device (alsa, device);
+
+        snd_ctl_close (ctl);
+        return FALSE;
+    }
+
+    id = snd_ctl_card_info_get_id (info);
+
+    /* We also keep a list of device identifiers to be sure no card is
+     * added twice, this could commonly happen because some card may
+     * also be assigned to the "default" ALSA device */
+    if (g_hash_table_contains (alsa->priv->devices_ids, id) == TRUE) {
+        snd_ctl_close (ctl);
+        return FALSE;
+    }
+
+    device = alsa_device_new (card, snd_ctl_card_info_get_name (info));
+
+    if (alsa_device_open (device) == FALSE) {
+        g_object_unref (device);
+        snd_ctl_close (ctl);
+        return FALSE;
+    }
+
+    g_object_set_data_full (G_OBJECT (device),
+                            "__matemixer_alsa_device_id",
+                            g_strdup (id),
+                            g_free);
+
+    add_device (alsa, device);
+
+    snd_ctl_close (ctl);
+    return TRUE;
+}
+
+static void
+add_device (AlsaBackend *alsa, AlsaDevice *device)
+{
+    const gchar *name;
+
+    name = mate_mixer_device_get_name (MATE_MIXER_DEVICE (device));
+
+    g_hash_table_insert (alsa->priv->devices,
+                         g_strdup (name),
+                         g_object_ref (device));
+
+    /* Remember the device identifier, use a single string copy as we only free
+     * the hash table key */
+    g_hash_table_add (alsa->priv->devices_ids,
+                      g_strdup (g_object_get_data (G_OBJECT (device),
+                                                   "__matemixer_alsa_device_id")));
+
+    g_signal_connect_swapped (G_OBJECT (device),
+                              "closed",
+                              G_CALLBACK (remove_device),
+                              alsa);
+    g_signal_connect_swapped (G_OBJECT (device),
+                              "stream-removed",
+                              G_CALLBACK (remove_stream),
+                              alsa);
+
+    g_signal_emit_by_name (G_OBJECT (alsa), "device-added", name);
+
+    /* Load the device elements after emitting device-added, because the load
+     * function will most likely emit stream-added on the device and backend */
+    alsa_device_load (device);
+}
+
+static void
+remove_device (AlsaBackend *alsa, AlsaDevice *device)
+{
+    const gchar *name;
+
+    name = mate_mixer_device_get_name (MATE_MIXER_DEVICE (device));
+
+    g_signal_handlers_disconnect_by_func (G_OBJECT (device),
+                                          G_CALLBACK (remove_device),
+                                          alsa);
+    g_signal_handlers_disconnect_by_func (G_OBJECT (device),
+                                          G_CALLBACK (remove_stream),
+                                          alsa);
+
+    /* Remove the device */
+    g_hash_table_remove (alsa->priv->devices_ids,
+                         g_object_get_data (G_OBJECT (device),
+                                            "__matemixer_alsa_device_id"));
+
+    // XXX close the device and make it remove streams
+    g_hash_table_remove (alsa->priv->devices, name);
+    g_signal_emit_by_name (G_OBJECT (alsa),
+                           "device-removed",
+                           name);
+}
+
+static void
+remove_stream (AlsaBackend *alsa, const gchar *name)
+{
+    MateMixerStream *stream;
+
+    stream = mate_mixer_backend_get_default_input_stream (MATE_MIXER_BACKEND (alsa));
+
+    // XXX see if the change happens after stream is removed or before
+    if (stream != NULL && strcmp (mate_mixer_stream_get_name (stream), name) == 0)
+        select_default_input_stream (alsa);
+
+    stream = mate_mixer_backend_get_default_output_stream (MATE_MIXER_BACKEND (alsa));
+
+    if (stream != NULL && strcmp (mate_mixer_stream_get_name (stream), name) == 0)
+        select_default_output_stream (alsa);
+}
+
+static void
+select_default_input_stream (AlsaBackend *alsa)
+{
+    AlsaDevice *device;
+    AlsaStream *stream;
+    gchar       card[16];
+    gint        num;
+
+    /* Always prefer stream in the "default" device */
+    device = g_hash_table_lookup (alsa->priv->devices, "default");
+    if (device != NULL) {
+        stream = alsa_device_get_input_stream (device);
+        if (stream != NULL) {
+            _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (alsa),
+                                                          MATE_MIXER_STREAM (stream));
+            return;
+        }
+    }
+
+    /* If there is no input stream in the default device, search the cards in
+     * the correct order */
+    for (num = 0;; num++) {
+        g_snprintf (card, sizeof (card), "hw:%d", num);
+
+        device = g_hash_table_lookup (alsa->priv->devices, card);
+        if (device == NULL)
+            break;
+        stream = alsa_device_get_input_stream (device);
+        if (stream != NULL) {
+            _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (alsa),
+                                                          MATE_MIXER_STREAM (stream));
+            return;
+        }
+    }
+
+    /* In the worst case unset the default stream */
+    _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (alsa), NULL);
+}
+
+static void
+select_default_output_stream (AlsaBackend *alsa)
+{
+    AlsaDevice *device;
+    AlsaStream *stream;
+    gchar       card[16];
+    gint        num;
+
+    /* Always prefer stream in the "default" device */
+    device = g_hash_table_lookup (alsa->priv->devices, "default");
+    if (device != NULL) {
+        stream = alsa_device_get_output_stream (device);
+        if (stream != NULL) {
+            _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (alsa),
+                                                           MATE_MIXER_STREAM (stream));
+            return;
+        }
+    }
+
+    /* If there is no input stream in the default device, search the cards in
+     * the correct order */
+    for (num = 0;; num++) {
+        g_snprintf (card, sizeof (card), "hw:%d", num);
+
+        device = g_hash_table_lookup (alsa->priv->devices, card);
+        if (device == NULL)
+            break;
+        stream = alsa_device_get_output_stream (device);
+        if (stream != NULL) {
+            _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (alsa),
+                                                           MATE_MIXER_STREAM (stream));
+            return;
+        }
+    }
+
+    /* In the worst case unset the default stream */
+    _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (alsa), NULL);
+}
diff --git a/backends/alsa/alsa-backend.h b/backends/alsa/alsa-backend.h
new file mode 100644
index 0000000..03fedf0
--- /dev/null
+++ b/backends/alsa/alsa-backend.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_BACKEND_H
+#define ALSA_BACKEND_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#define ALSA_TYPE_BACKEND                       \
+        (alsa_backend_get_type ())
+#define ALSA_BACKEND(o)                         \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_BACKEND, AlsaBackend))
+#define ALSA_IS_BACKEND(o)                      \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_BACKEND))
+#define ALSA_BACKEND_CLASS(k)                   \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_BACKEND, AlsaBackendClass))
+#define ALSA_IS_BACKEND_CLASS(k)                \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_BACKEND))
+#define ALSA_BACKEND_GET_CLASS(o)               \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_BACKEND, AlsaBackendClass))
+
+typedef struct _AlsaBackend         AlsaBackend;
+typedef struct _AlsaBackendClass    AlsaBackendClass;
+typedef struct _AlsaBackendPrivate  AlsaBackendPrivate;
+
+struct _AlsaBackend
+{
+    MateMixerBackend parent;
+
+    /*< private >*/
+    AlsaBackendPrivate *priv;
+};
+
+struct _AlsaBackendClass
+{
+    MateMixerBackendClass parent_class;
+};
+
+GType                       alsa_backend_get_type   (void) G_GNUC_CONST;
+
+/* Support function for dynamic loading of the backend module */
+void                        backend_module_init     (GTypeModule *module);
+const MateMixerBackendInfo *backend_module_get_info (void);
+
+#endif /* ALSA_BACKEND_H */
diff --git a/backends/alsa/alsa-constants.c b/backends/alsa/alsa-constants.c
new file mode 100644
index 0000000..2124a2e
--- /dev/null
+++ b/backends/alsa/alsa-constants.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <alsa/asoundlib.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-constants.h"
+
+// XXX add more and probably move them somewhere else
+const AlsaControlInfo alsa_controls[] =
+{
+    { "Master",   N_("Master"),  MATE_MIXER_STREAM_CONTROL_ROLE_MASTER },
+    { "Speaker",  N_("Speaker"), MATE_MIXER_STREAM_CONTROL_ROLE_MASTER },
+    { "Capture",  N_("Capture"), MATE_MIXER_STREAM_CONTROL_ROLE_MASTER },
+    { "PCM",      N_("PCM"),     MATE_MIXER_STREAM_CONTROL_ROLE_PCM },
+    { "Line",     N_("Line"),    MATE_MIXER_STREAM_CONTROL_ROLE_PORT },
+    { "Mic",      N_("Mic"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT },
+    { NULL }
+};
+
+const MateMixerChannelPosition alsa_channel_map_from[SND_MIXER_SCHN_LAST] =
+{
+    [SND_MIXER_SCHN_FRONT_LEFT]             = MATE_MIXER_CHANNEL_FRONT_LEFT,
+    [SND_MIXER_SCHN_FRONT_RIGHT]            = MATE_MIXER_CHANNEL_FRONT_RIGHT,
+    [SND_MIXER_SCHN_REAR_LEFT]              = MATE_MIXER_CHANNEL_BACK_LEFT,
+    [SND_MIXER_SCHN_REAR_RIGHT]             = MATE_MIXER_CHANNEL_BACK_RIGHT,
+    [SND_MIXER_SCHN_FRONT_CENTER]           = MATE_MIXER_CHANNEL_FRONT_CENTER,
+    [SND_MIXER_SCHN_WOOFER]                 = MATE_MIXER_CHANNEL_LFE,
+    [SND_MIXER_SCHN_SIDE_LEFT]              = MATE_MIXER_CHANNEL_SIDE_LEFT,
+    [SND_MIXER_SCHN_SIDE_RIGHT]             = MATE_MIXER_CHANNEL_SIDE_RIGHT,
+    [SND_MIXER_SCHN_REAR_CENTER]            = MATE_MIXER_CHANNEL_BACK_CENTER
+};
+
+const snd_mixer_selem_channel_id_t alsa_channel_map_to[MATE_MIXER_CHANNEL_MAX] =
+{
+    [MATE_MIXER_CHANNEL_UNKNOWN]            = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_MONO]               = SND_MIXER_SCHN_MONO,
+    [MATE_MIXER_CHANNEL_FRONT_LEFT]         = SND_MIXER_SCHN_FRONT_LEFT,
+    [MATE_MIXER_CHANNEL_FRONT_RIGHT]        = SND_MIXER_SCHN_FRONT_RIGHT,
+    [MATE_MIXER_CHANNEL_FRONT_CENTER]       = SND_MIXER_SCHN_FRONT_CENTER,
+    [MATE_MIXER_CHANNEL_LFE]                = SND_MIXER_SCHN_WOOFER,
+    [MATE_MIXER_CHANNEL_BACK_LEFT]          = SND_MIXER_SCHN_REAR_LEFT,
+    [MATE_MIXER_CHANNEL_BACK_RIGHT]         = SND_MIXER_SCHN_REAR_RIGHT,
+    [MATE_MIXER_CHANNEL_BACK_CENTER]        = SND_MIXER_SCHN_REAR_CENTER,
+    [MATE_MIXER_CHANNEL_FRONT_LEFT_CENTER]  = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_FRONT_RIGHT_CENTER] = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_SIDE_LEFT]          = SND_MIXER_SCHN_SIDE_LEFT,
+    [MATE_MIXER_CHANNEL_SIDE_RIGHT]         = SND_MIXER_SCHN_SIDE_RIGHT,
+    [MATE_MIXER_CHANNEL_TOP_FRONT_LEFT]     = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_TOP_FRONT_RIGHT]    = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_TOP_FRONT_CENTER]   = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_TOP_CENTER]         = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_TOP_BACK_LEFT]      = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_TOP_BACK_RIGHT]     = SND_MIXER_SCHN_UNKNOWN,
+    [MATE_MIXER_CHANNEL_TOP_BACK_CENTER]    = SND_MIXER_SCHN_UNKNOWN
+};
diff --git a/backends/oss4/oss4-common.h b/backends/alsa/alsa-constants.h
index fe55b2b..81257c7 100644
--- a/backends/oss4/oss4-common.h
+++ b/backends/alsa/alsa-constants.h
@@ -15,24 +15,21 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef OSS4_COMMON_H
-#define OSS4_COMMON_H
+#ifndef ALSA_CONSTANTS_H
+#define ALSA_CONSTANTS_H
 
-#include "config.h"
+#include <glib.h>
+#include <alsa/asoundlib.h>
+#include <libmatemixer/matemixer.h>
 
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
+typedef struct {
+    gchar                     *name;
+    gchar                     *label;
+    MateMixerStreamControlRole role;
+} AlsaControlInfo;
 
-#ifdef HAVE_SYS_SOUNDCARD_H
-#  include <sys/soundcard.h>
-#elif HAVE_SOUNDCARD_H
-#  include <soundcard.h>
-#elif HAVE_MACHINE_SOUNDCARD_H
-#  include <machine/soundcard.h>
-#else
-#  error "No OSS4 header file present"
-#endif
+extern const AlsaControlInfo                alsa_controls[];
+extern const MateMixerChannelPosition       alsa_channel_map_from[];
+extern const snd_mixer_selem_channel_id_t   alsa_channel_map_to[];
 
-#endif /* OSS4_COMMON_H */
+#endif /* ALSA_CONSTANTS_H */
diff --git a/backends/alsa/alsa-device.c b/backends/alsa/alsa-device.c
new file mode 100644
index 0000000..5acc6f5
--- /dev/null
+++ b/backends/alsa/alsa-device.c
@@ -0,0 +1,941 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <strings.h>
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-constants.h"
+#include "alsa-device.h"
+#include "alsa-element.h"
+#include "alsa-stream.h"
+#include "alsa-stream-control.h"
+#include "alsa-stream-input-control.h"
+#include "alsa-stream-output-control.h"
+#include "alsa-switch.h"
+#include "alsa-switch-option.h"
+#include "alsa-toggle.h"
+
+#define ALSA_DEVICE_ICON "audio-card"
+
+struct _AlsaDevicePrivate
+{
+    snd_mixer_t  *handle;
+    GMainContext *context;
+    GMutex        mutex;
+    GCond         cond;
+    AlsaStream   *input;
+    AlsaStream   *output;
+    GHashTable   *switches;
+    gboolean      events_pending;
+};
+
+enum {
+    CLOSED,
+    N_SIGNALS
+};
+
+static guint signals[N_SIGNALS] = { 0, };
+
+static void alsa_device_class_init (AlsaDeviceClass *klass);
+static void alsa_device_init       (AlsaDevice      *device);
+static void alsa_device_dispose    (GObject         *object);
+static void alsa_device_finalize   (GObject         *object);
+
+G_DEFINE_TYPE (AlsaDevice, alsa_device, MATE_MIXER_TYPE_DEVICE)
+
+static MateMixerSwitch *alsa_device_get_switch    (MateMixerDevice            *mmd,
+                                                   const gchar                *name);
+
+static GList *          alsa_device_list_streams  (MateMixerDevice            *mmd);
+static GList *          alsa_device_list_switches (MateMixerDevice            *mmd);
+
+static gboolean         add_stream_input_control  (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+static gboolean         add_stream_output_control (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+
+static gboolean         add_switch                (AlsaDevice                 *device,
+                                                   AlsaStream                 *stream,
+                                                   snd_mixer_elem_t           *el);
+
+static gboolean         add_device_switch         (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+
+static gboolean         add_stream_input_switch   (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+static gboolean         add_stream_output_switch  (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+
+static gboolean         add_stream_input_toggle   (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+static gboolean         add_stream_output_toggle  (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+
+static void             load_element              (AlsaDevice                 *device,
+                                                   snd_mixer_elem_t           *el);
+
+static void             load_elements_by_name     (AlsaDevice                 *device,
+                                                   const gchar                *name);
+
+static void             remove_elements_by_name   (AlsaDevice                 *device,
+                                                   const gchar                *name);
+
+static void             handle_poll               (AlsaDevice                 *device);
+
+static gboolean         handle_process_events     (AlsaDevice                 *device);
+
+static int              handle_callback           (snd_mixer_t                *handle,
+                                                   guint                       mask,
+                                                   snd_mixer_elem_t           *el);
+static int              handle_element_callback   (snd_mixer_elem_t           *el,
+                                                   guint                       mask);
+
+static void             close_device              (AlsaDevice                 *device);
+
+static gchar *          get_element_name          (snd_mixer_elem_t           *el);
+static void             get_control_info          (snd_mixer_elem_t           *el,
+                                                   gchar                     **name,
+                                                   gchar                     **label,
+                                                   MateMixerStreamControlRole *role);
+
+static void             get_switch_info           (snd_mixer_elem_t           *el,
+                                                   gchar                     **name,
+                                                   gchar                     **label);
+
+static void
+alsa_device_class_init (AlsaDeviceClass *klass)
+{
+    GObjectClass         *object_class;
+    MateMixerDeviceClass *device_class;
+
+    object_class = G_OBJECT_CLASS (klass);
+    object_class->dispose  = alsa_device_dispose;
+    object_class->finalize = alsa_device_finalize;
+
+    device_class = MATE_MIXER_DEVICE_CLASS (klass);
+    device_class->get_switch    = alsa_device_get_switch;
+    device_class->list_streams  = alsa_device_list_streams;
+    device_class->list_switches = alsa_device_list_switches;
+
+    signals[CLOSED] =
+        g_signal_new ("closed",
+                      G_TYPE_FROM_CLASS (object_class),
+                      G_SIGNAL_RUN_LAST,
+                      G_STRUCT_OFFSET (AlsaDeviceClass, closed),
+                      NULL,
+                      NULL,
+                      g_cclosure_marshal_VOID__VOID,
+                      G_TYPE_NONE,
+                      0,
+                      G_TYPE_NONE);
+
+    g_type_class_add_private (object_class, sizeof (AlsaDevicePrivate));
+}
+
+static void
+alsa_device_init (AlsaDevice *device)
+{
+    device->priv = G_TYPE_INSTANCE_GET_PRIVATE (device,
+                                                ALSA_TYPE_DEVICE,
+                                                AlsaDevicePrivate);
+
+    device->priv->switches = g_hash_table_new_full (g_str_hash,
+                                                    g_str_equal,
+                                                    g_free,
+                                                    g_object_unref);
+
+    device->priv->context = g_main_context_ref_thread_default ();
+
+    g_mutex_init (&device->priv->mutex);
+    g_cond_init (&device->priv->cond);
+}
+
+static void
+alsa_device_dispose (GObject *object)
+{
+    AlsaDevice *device;
+
+    device = ALSA_DEVICE (object);
+
+    g_clear_object (&device->priv->input);
+    g_clear_object (&device->priv->output);
+
+    g_hash_table_remove_all (device->priv->switches);
+
+    G_OBJECT_CLASS (alsa_device_parent_class)->dispose (object);
+}
+
+static void
+alsa_device_finalize (GObject *object)
+{
+    AlsaDevice *device;
+
+    device = ALSA_DEVICE (object);
+
+    g_mutex_clear (&device->priv->mutex);
+    g_cond_clear (&device->priv->cond);
+
+    g_hash_table_unref (device->priv->switches);
+    g_main_context_unref (device->priv->context);
+
+    if (device->priv->handle != NULL)
+        snd_mixer_close (device->priv->handle);
+
+    G_OBJECT_CLASS (alsa_device_parent_class)->dispose (object);
+}
+
+AlsaDevice *
+alsa_device_new (const gchar *name, const gchar *label)
+{
+    AlsaDevice  *device;
+    gchar       *stream_name;
+
+    g_return_val_if_fail (name != NULL, NULL);
+    g_return_val_if_fail (label != NULL, NULL);
+
+    device = g_object_new (ALSA_TYPE_DEVICE,
+                           "name", name,
+                           "label", label,
+                           "icon", ALSA_DEVICE_ICON,
+                           NULL);
+
+    /* Create input and output streams, they will exist the whole time, but
+     * the added and removed signals will be emitted when the first control or
+     * switch is added or the last one removed */
+    stream_name = g_strdup_printf ("alsa-input-%s", name);
+    device->priv->input = alsa_stream_new (stream_name,
+                                           MATE_MIXER_DEVICE (device),
+                                           MATE_MIXER_STREAM_INPUT);
+    g_free (stream_name);
+
+    stream_name = g_strdup_printf ("alsa-output-%s", name);
+    device->priv->output = alsa_stream_new (stream_name,
+                                            MATE_MIXER_DEVICE (device),
+                                            MATE_MIXER_STREAM_OUTPUT);
+    g_free (stream_name);
+
+    return device;
+}
+
+gboolean
+alsa_device_open (AlsaDevice *device)
+{
+    snd_mixer_t *handle;
+    const gchar *name;
+    gint         ret;
+
+    g_return_val_if_fail (ALSA_IS_DEVICE (device), FALSE);
+    g_return_val_if_fail (device->priv->handle == NULL, FALSE);
+
+    name = mate_mixer_device_get_name (MATE_MIXER_DEVICE (device));
+
+    g_debug ("Opening device %s (%s)",
+             name,
+             mate_mixer_device_get_label (MATE_MIXER_DEVICE (device)));
+
+    /* Open the mixer for the current device */
+    ret = snd_mixer_open (&handle, 0);
+    if (ret < 0) {
+        g_warning ("Failed to open mixer: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    ret = snd_mixer_attach (handle, name);
+    if (ret < 0) {
+        g_warning ("Failed to attach mixer to %s: %s",
+                   name,
+                   snd_strerror (ret));
+
+        snd_mixer_close (handle);
+        return FALSE;
+    }
+    ret = snd_mixer_selem_register (handle, NULL, NULL);
+    if (ret < 0) {
+        g_warning ("Failed to register simple element for %s: %s",
+                   name,
+                   snd_strerror (ret));
+
+        snd_mixer_close (handle);
+        return FALSE;
+    }
+    ret = snd_mixer_load (handle);
+    if (ret < 0) {
+        g_warning ("Failed to load mixer elements for %s: %s",
+                   name,
+                   snd_strerror (ret));
+
+        snd_mixer_close (handle);
+        return FALSE;
+    }
+
+    device->priv->handle = handle;
+    return TRUE;
+}
+
+void
+alsa_device_load (AlsaDevice *device)
+{
+    GThread          *thread;
+    GError           *error = NULL;
+    snd_mixer_elem_t *el;
+
+    g_return_if_fail (ALSA_IS_DEVICE (device));
+    g_return_if_fail (device->priv->handle != NULL);
+
+    /* Process the mixer elements */
+    el = snd_mixer_first_elem (device->priv->handle);
+    while (el != NULL) {
+        load_element (device, el);
+
+        el = snd_mixer_elem_next (el);
+    }
+
+    /* Set callback for ALSA events */
+    snd_mixer_set_callback (device->priv->handle, handle_callback);
+    snd_mixer_set_callback_private (device->priv->handle, device);
+
+    /* Start the polling thread */
+    thread = g_thread_try_new ("matemixer-alsa-poll",
+                               (GThreadFunc) handle_poll,
+                               device,
+                               &error);
+    if (thread == NULL) {
+        /* The error is not treated as fatal, because without the polling
+         * thread we still have most of the functionality */
+        g_warning ("Failed to create poll thread: %s", error->message);
+        g_error_free (error);
+    } else
+        g_thread_unref (thread);
+}
+
+AlsaStream *
+alsa_device_get_input_stream (AlsaDevice *device)
+{
+    g_return_val_if_fail (ALSA_IS_DEVICE (device), NULL);
+
+    /* Normally controlless streams should not exist, here we simulate the
+     * behaviour for the owning instance */
+    if (alsa_stream_is_empty (device->priv->input) == FALSE)
+        return device->priv->input;
+
+    return NULL;
+}
+
+AlsaStream *
+alsa_device_get_output_stream (AlsaDevice *device)
+{
+    g_return_val_if_fail (ALSA_IS_DEVICE (device), NULL);
+
+    /* Normally controlless streams should not exist, here we simulate the
+     * behaviour for the owning instance */
+    if (alsa_stream_is_empty (device->priv->output) == FALSE)
+        return device->priv->output;
+
+    return NULL;
+}
+
+static gboolean
+add_element (AlsaDevice *device, AlsaStream *stream, AlsaElement *element)
+{
+    gboolean added = FALSE;
+
+    if (alsa_element_load (element) == FALSE)
+        return FALSE;
+
+    if (stream != NULL) {
+        gboolean empty = FALSE;
+
+        if (alsa_stream_is_empty (stream) == TRUE) {
+            const gchar *name =
+                mate_mixer_stream_get_name (MATE_MIXER_STREAM (stream));
+
+            /* Pretend the stream has just been created now that we are adding
+             * the first control */
+            g_signal_emit_by_name (G_OBJECT (device),
+                                   "stream-added",
+                                   name);
+            empty = TRUE;
+        }
+
+        if (ALSA_IS_STREAM_CONTROL (element)) {
+            alsa_stream_add_control (stream, ALSA_STREAM_CONTROL (element));
+
+            /* If this is the first control, set it as the default one.
+             * The controls often seem to come in the order of importance, but this is
+             * driver specific, so we may later see if there is another control which
+             * better matches the default. */
+            if (empty == TRUE)
+                alsa_stream_set_default_control (stream, ALSA_STREAM_CONTROL (element));
+
+            added = TRUE;
+        } else if (ALSA_IS_SWITCH (element)) {
+            /* Switch belonging to a stream */
+            alsa_stream_add_switch (stream, ALSA_SWITCH (element));
+            added = TRUE;
+        }
+    } else if (ALSA_IS_SWITCH (element)) {
+        /* Switch belonging to the device */
+        const gchar *name =
+            mate_mixer_switch_get_name (MATE_MIXER_SWITCH (element));
+
+        g_hash_table_insert (device->priv->switches,
+                             g_strdup (name),
+                             g_object_ref (element));
+
+        g_signal_emit_by_name (G_OBJECT (device),
+                               "switch-added",
+                               name);
+        added = TRUE;
+    }
+
+    if G_LIKELY (added == TRUE) {
+        snd_mixer_elem_t *el = alsa_element_get_snd_element (element);
+
+        snd_mixer_elem_set_callback (el, handle_element_callback);
+        snd_mixer_elem_set_callback_private (el, device);
+    }
+    return added;
+}
+
+static MateMixerSwitch *
+alsa_device_get_switch (MateMixerDevice *mmd, const gchar *name)
+{
+    g_return_val_if_fail (ALSA_IS_DEVICE (mmd), NULL);
+    g_return_val_if_fail (name != NULL, NULL);
+
+    return g_hash_table_lookup (ALSA_DEVICE (mmd)->priv->switches, name);
+}
+
+static GList *
+alsa_device_list_streams (MateMixerDevice *mmd)
+{
+    AlsaDevice *device;
+    GList      *list = NULL;
+
+    g_return_val_if_fail (ALSA_IS_DEVICE (mmd), NULL);
+
+    device = ALSA_DEVICE (mmd);
+
+    if (device->priv->output != NULL)
+        list = g_list_prepend (list, g_object_ref (device->priv->output));
+    if (device->priv->input != NULL)
+        list = g_list_prepend (list, g_object_ref (device->priv->input));
+
+    return list;
+}
+
+static GList *
+alsa_device_list_switches (MateMixerDevice *mmd)
+{
+    GList *list;
+
+    g_return_val_if_fail (ALSA_IS_DEVICE (mmd), NULL);
+
+    /* Convert the hash table to a linked list, this list is expected to be
+     * cached in the main library */
+    list = g_hash_table_get_values (ALSA_DEVICE (mmd)->priv->switches);
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+
+    return list;
+}
+
+static gboolean
+add_stream_input_control (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    AlsaStreamControl         *control;
+    gchar                     *name;
+    gchar                     *label;
+    MateMixerStreamControlRole role;
+
+    get_control_info (el, &name, &label, &role);
+
+    g_debug ("Found device %s input control %s",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             label);
+
+    control = alsa_stream_input_control_new (name, label, role);
+    g_free (name);
+    g_free (label);
+
+    alsa_element_set_snd_element (ALSA_ELEMENT (control), el);
+
+    if (add_element (device, device->priv->input, ALSA_ELEMENT (control)) == FALSE) {
+        g_object_unref (control);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+add_stream_output_control (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    AlsaStreamControl         *control;
+    gchar                     *label;
+    gchar                     *name;
+    MateMixerStreamControlRole role;
+
+    get_control_info (el, &name, &label, &role);
+
+    g_debug ("Found device %s output control %s",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             label);
+
+    control = alsa_stream_output_control_new (name, label, role);
+    g_free (name);
+    g_free (label);
+
+    alsa_element_set_snd_element (ALSA_ELEMENT (control), el);
+
+    if (add_element (device, device->priv->output, ALSA_ELEMENT (control)) == FALSE) {
+        g_object_unref (control);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static AlsaToggle *
+create_toggle (AlsaDevice *device, snd_mixer_elem_t *el, AlsaToggleType type)
+{
+    AlsaToggle       *toggle;
+    AlsaSwitchOption *on;
+    AlsaSwitchOption *off;
+    gchar            *name;
+    gchar            *label;
+
+    on  = alsa_switch_option_new ("On", _("On"), NULL, 1);
+    off = alsa_switch_option_new ("Off", _("Off"), NULL, 0);
+
+    get_switch_info (el, &name, &label);
+    toggle = alsa_toggle_new (name,
+                              label,
+                              type,
+                              on, off);
+    g_free (name);
+    g_free (label);
+
+    alsa_element_set_snd_element (ALSA_ELEMENT (toggle), el);
+
+    g_object_unref (on);
+    g_object_unref (off);
+
+    return toggle;
+}
+
+static gboolean
+add_switch (AlsaDevice *device, AlsaStream *stream, snd_mixer_elem_t *el)
+{
+    AlsaElement *element = NULL;
+    GList       *options = NULL;
+    gchar       *name;
+    gchar       *label;
+    gchar        item[128];
+    guint        i;
+    gint         count;
+    gint         ret;
+
+    count = snd_mixer_selem_get_enum_items (el);
+    if G_UNLIKELY (count <= 0) {
+        g_debug ("Skipping mixer switch %s with %d items",
+                 snd_mixer_selem_get_name (el),
+                 count);
+        return FALSE;
+    }
+
+    for (i = 0; i < count; i++) {
+        ret = snd_mixer_selem_get_enum_item_name (el, i,
+                                                  sizeof (item),
+                                                  item);
+        if G_LIKELY (ret == 0)
+            options = g_list_prepend (options,
+                                      alsa_switch_option_new (item, item, NULL, i));
+        else
+            g_warning ("Failed to read switch item name: %s", snd_strerror (ret));
+    }
+
+    get_switch_info (el, &name, &label);
+
+    /* Takes ownership of options */
+    element = ALSA_ELEMENT (alsa_switch_new (name, label, g_list_reverse (options)));
+    g_free (name);
+    g_free (label);
+
+    alsa_element_set_snd_element (element, el);
+
+    if (add_element (device, stream, element) == FALSE) {
+        g_object_unref (element);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+add_device_switch (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    g_debug ("Reading device %s switch %s (%d items)",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             snd_mixer_selem_get_name (el),
+             snd_mixer_selem_get_enum_items (el));
+
+    return add_switch (device, NULL, el);
+}
+
+static gboolean
+add_stream_input_switch (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    g_debug ("Reading device %s input switch %s (%d items)",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             snd_mixer_selem_get_name (el),
+             snd_mixer_selem_get_enum_items (el));
+
+    return add_switch (device, device->priv->input, el);
+}
+
+static gboolean
+add_stream_output_switch (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    g_debug ("Reading device %s output switch %s (%d items)",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             snd_mixer_selem_get_name (el),
+             snd_mixer_selem_get_enum_items (el));
+
+    return add_switch (device, device->priv->output, el);
+}
+
+static gboolean
+add_stream_input_toggle (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    AlsaToggle *toggle;
+
+    g_debug ("Reading device %s input toggle %s",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             snd_mixer_selem_get_name (el));
+
+    toggle = create_toggle (device, el, ALSA_TOGGLE_CAPTURE);
+
+    if (add_element (device, device->priv->input, ALSA_ELEMENT (toggle)) == FALSE) {
+        g_object_unref (toggle);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+add_stream_output_toggle (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    AlsaToggle *toggle;
+
+    g_debug ("Reading device %s output toggle %s",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)),
+             snd_mixer_selem_get_name (el));
+
+    toggle = create_toggle (device, el, ALSA_TOGGLE_PLAYBACK);
+
+    if (add_element (device, device->priv->output, ALSA_ELEMENT (toggle)) == FALSE) {
+        g_object_unref (toggle);
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static void
+load_element (AlsaDevice *device, snd_mixer_elem_t *el)
+{
+    gboolean cvolume = FALSE;
+    gboolean pvolume = FALSE;
+
+    if (snd_mixer_selem_is_enumerated (el) == 1) {
+        gboolean cenum = FALSE;
+        gboolean penum = FALSE;
+
+        if (snd_mixer_selem_is_enum_capture (el) == 1)
+            cenum = TRUE;
+        if (snd_mixer_selem_is_enum_playback (el) == 1)
+            penum = TRUE;
+
+        /* Enumerated controls which are not marked as capture or playback
+         * are considered to be a part of the whole device, although sometimes
+         * this is incorrectly reported by the driver */
+        if (cenum == FALSE && penum == FALSE) {
+            add_device_switch (device, el);
+        }
+        else if (cenum == TRUE)
+            add_stream_input_switch (device, el);
+        else if (penum == TRUE)
+            add_stream_output_switch (device, el);
+    }
+
+    if (snd_mixer_selem_has_capture_volume (el) == 1 ||
+        snd_mixer_selem_has_common_volume (el) == 1)
+        cvolume = TRUE;
+    if (snd_mixer_selem_has_playback_volume (el) == 1 ||
+        snd_mixer_selem_has_common_volume (el) == 1)
+        pvolume = TRUE;
+
+    if (cvolume == FALSE && pvolume == FALSE) {
+        /* Control without volume and with a switch are modelled as toggles */
+        if (snd_mixer_selem_has_capture_switch (el) == 1)
+            add_stream_input_toggle (device, el);
+
+        if (snd_mixer_selem_has_playback_switch (el) == 1)
+            add_stream_output_toggle (device, el);
+    } else {
+        if (cvolume == TRUE)
+            add_stream_input_control (device, el);
+        if (pvolume == TRUE)
+            add_stream_output_control (device, el);
+    }
+}
+
+static void
+load_elements_by_name (AlsaDevice *device, const gchar *name)
+{
+    AlsaElement *element;
+
+    alsa_stream_load_elements (device->priv->input, name);
+    alsa_stream_load_elements (device->priv->output, name);
+
+    element = g_hash_table_lookup (device->priv->switches, name);
+    if (element != NULL)
+        alsa_element_load (element);
+}
+
+static void
+remove_elements_by_name (AlsaDevice *device, const gchar *name)
+{
+    if (alsa_stream_remove_elements (device->priv->input, name) == TRUE) {
+        /* Removing last stream element "removes" the stream */
+        if (alsa_stream_is_empty (device->priv->input) == TRUE) {
+            const gchar *stream_name =
+                mate_mixer_stream_get_name (MATE_MIXER_STREAM (device->priv->input));
+
+            g_signal_emit_by_name (G_OBJECT (device),
+                                   "stream-removed",
+                                   stream_name);
+        }
+    }
+
+    if (alsa_stream_remove_elements (device->priv->output, name) == TRUE) {
+        /* Removing last stream element "removes" the stream */
+        if (alsa_stream_is_empty (device->priv->output) == TRUE) {
+            const gchar *stream_name =
+                mate_mixer_stream_get_name (MATE_MIXER_STREAM (device->priv->output));
+
+            g_signal_emit_by_name (G_OBJECT (device),
+                                   "stream-removed",
+                                   stream_name);
+        }
+    }
+
+    if (g_hash_table_remove (device->priv->switches, name) == TRUE)
+        g_signal_emit_by_name (G_OBJECT (device),
+                               "switch-removed",
+                               name);
+}
+
+static void
+handle_poll (AlsaDevice *device)
+{
+    /* This function is called in a worker thread. It is supposed to wait for
+     * ALSA events and call handle_process_events(). Processing the events might
+     * result in emitting the CLOSED signal and unreffing the instance in the
+     * owner, so keep an extra reference during the lifetime of the thread. */
+    g_object_ref (device);
+
+    while (TRUE) {
+        gint ret = snd_mixer_wait (device->priv->handle, -1);
+        if (ret < 0) {
+            if (ret == EINTR)
+                continue;
+            break;
+        }
+
+        device->priv->events_pending = TRUE;
+
+        /* Process the events in the main thread because most events end up
+         * emitting signals */
+        g_main_context_invoke (device->priv->context,
+                               (GSourceFunc) handle_process_events,
+                               device);
+
+        g_mutex_lock (&device->priv->mutex);
+
+        /* Use a GCond to wait until the events are processed. The processing
+         * function may be called any time later in the main loop and snd_mixer_wait()
+         * returns instantly while there are pending events. Without the wait,
+         * g_main_context_invoke() could be called repeatedly to create idle sources
+         * until the first idle source function is called. */
+        while (device->priv->events_pending == TRUE)
+            g_cond_wait (&device->priv->cond, &device->priv->mutex);
+
+        g_mutex_unlock (&device->priv->mutex);
+
+        /* Exit the thread if the processing function closed the device */
+        if (device->priv->handle == NULL)
+            break;
+    }
+
+    g_debug ("Terminating poll thread for device %s",
+             mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)));
+
+    g_object_unref (device);
+}
+
+static gboolean
+handle_process_events (AlsaDevice *device)
+{
+    g_mutex_lock (&device->priv->mutex);
+
+    if (device->priv->handle != NULL) {
+        gint ret = snd_mixer_handle_events (device->priv->handle);
+        if (ret < 0)
+            close_device (device);
+    }
+
+    device->priv->events_pending = FALSE;
+
+    g_cond_signal (&device->priv->cond);
+    g_mutex_unlock (&device->priv->mutex);
+
+    return G_SOURCE_REMOVE;
+}
+
+/* ALSA has a per-mixer callback and per-element callback, per-mixer callback
+ * is only used for added elements and per-element callback for all the
+ * other messages (no, the documentation doesn't say anything about that). */
+static int
+handle_callback (snd_mixer_t *handle, guint mask, snd_mixer_elem_t *el)
+{
+    if (mask & SND_CTL_EVENT_MASK_ADD) {
+        AlsaDevice *device = snd_mixer_get_callback_private (handle);
+
+        load_element (device, el);
+    }
+    return 0;
+}
+
+static int
+handle_element_callback (snd_mixer_elem_t *el, guint mask)
+{
+    AlsaDevice *device;
+    gchar      *name;
+
+    device = snd_mixer_elem_get_callback_private (el);
+    name = get_element_name (el);
+
+    if (mask == SND_CTL_EVENT_MASK_REMOVE) {
+        /* Make sure this function is not called again with the element */
+        snd_mixer_elem_set_callback_private (el, NULL);
+        snd_mixer_elem_set_callback (el, NULL);
+
+        remove_elements_by_name (device, name);
+    } else {
+        if (mask & SND_CTL_EVENT_MASK_INFO) {
+            remove_elements_by_name (device, name);
+            load_element (device, el);
+        }
+        if (mask & SND_CTL_EVENT_MASK_VALUE)
+            load_elements_by_name (device, name);
+    }
+    g_free (name);
+
+    return 0;
+}
+
+static void
+close_device (AlsaDevice *device)
+{
+    if (device->priv->handle != NULL) {
+        snd_mixer_close (device->priv->handle);
+        device->priv->handle = NULL;
+    }
+
+    /* This signal tells the owner that the device has been closed voluntarily
+     * from within the instance */
+    g_signal_emit (G_OBJECT (device), signals[CLOSED], 0);
+}
+
+static gchar *
+get_element_name (snd_mixer_elem_t *el)
+{
+    return g_strdup_printf ("%s-%d",
+                            snd_mixer_selem_get_name (el),
+                            snd_mixer_selem_get_index (el));
+}
+
+static void
+get_control_info (snd_mixer_elem_t           *el,
+                  gchar                     **name,
+                  gchar                     **label,
+                  MateMixerStreamControlRole *role)
+{
+    MateMixerStreamControlRole r = MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN;
+    const gchar               *n;
+    const gchar               *l = NULL;
+    gint                       i;
+
+    n = snd_mixer_selem_get_name (el);
+
+    for (i = 0; alsa_controls[i].name != NULL; i++)
+        if (strcmp (n, alsa_controls[i].name) == 0) {
+            l = alsa_controls[i].label;
+            r = alsa_controls[i].role;
+            break;
+        }
+
+    *name = get_element_name (el);
+    if (l != NULL)
+        *label = g_strdup (l);
+    else
+        *label = g_strdup (n);
+
+    *role = r;
+}
+
+static void
+get_switch_info (snd_mixer_elem_t           *el,
+                 gchar                     **name,
+                 gchar                     **label)
+{
+    // MateMixerStreamControlRole r = MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN;
+    const gchar               *n;
+    const gchar               *l = NULL;
+    // gint                       i;
+
+    n = snd_mixer_selem_get_name (el);
+
+    // TODO provide translated label and flags
+
+/*
+    for (i = 0; alsa_controls[i].name != NULL; i++)
+        if (strcmp (n, alsa_controls[i].name) == 0) {
+            l = alsa_controls[i].label;
+            r = alsa_controls[i].role;
+            break;
+        }
+*/
+    *name = get_element_name (el);
+    if (l != NULL)
+        *label = g_strdup (l);
+    else
+        *label = g_strdup (n);
+
+    // *role = r;
+}
diff --git a/backends/alsa/alsa-device.h b/backends/alsa/alsa-device.h
new file mode 100644
index 0000000..3b3c970
--- /dev/null
+++ b/backends/alsa/alsa-device.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_DEVICE_H
+#define ALSA_DEVICE_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include "alsa-stream.h"
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_DEVICE                        \
+        (alsa_device_get_type ())
+#define ALSA_DEVICE(o)                          \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_DEVICE, AlsaDevice))
+#define ALSA_IS_DEVICE(o)                       \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_DEVICE))
+#define ALSA_DEVICE_CLASS(k)                    \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_DEVICE, AlsaDeviceClass))
+#define ALSA_IS_DEVICE_CLASS(k)                 \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_DEVICE))
+#define ALSA_DEVICE_GET_CLASS(o)                \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_DEVICE, AlsaDeviceClass))
+
+typedef struct _AlsaDevice         AlsaDevice;
+typedef struct _AlsaDeviceClass    AlsaDeviceClass;
+typedef struct _AlsaDevicePrivate  AlsaDevicePrivate;
+
+struct _AlsaDevice
+{
+    MateMixerDevice parent;
+
+    /*< private >*/
+    AlsaDevicePrivate *priv;
+};
+
+struct _AlsaDeviceClass
+{
+    MateMixerDeviceClass parent_class;
+
+    /*< private >*/
+    void (*closed) (AlsaDevice *device);
+};
+
+GType       alsa_device_get_type          (void) G_GNUC_CONST;
+
+AlsaDevice *alsa_device_new               (const gchar *name,
+                                           const gchar *label);
+
+gboolean    alsa_device_open              (AlsaDevice  *device);
+void        alsa_device_load              (AlsaDevice  *device);
+
+AlsaStream *alsa_device_get_input_stream  (AlsaDevice  *device);
+AlsaStream *alsa_device_get_output_stream (AlsaDevice  *device);
+
+G_END_DECLS
+
+#endif /* ALSA_DEVICE_H */
diff --git a/backends/alsa/alsa-element.c b/backends/alsa/alsa-element.c
new file mode 100644
index 0000000..f925064
--- /dev/null
+++ b/backends/alsa/alsa-element.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include "alsa-element.h"
+
+G_DEFINE_INTERFACE (AlsaElement, alsa_element, G_TYPE_OBJECT)
+
+static void
+alsa_element_default_init (AlsaElementInterface *iface)
+{
+}
+
+snd_mixer_elem_t *
+alsa_element_get_snd_element (AlsaElement *element)
+{
+    g_return_val_if_fail (ALSA_IS_ELEMENT (element), NULL);
+
+    return ALSA_ELEMENT_GET_INTERFACE (element)->get_snd_element (element);
+}
+
+void
+alsa_element_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el)
+{
+    g_return_if_fail (ALSA_IS_ELEMENT (element));
+
+    ALSA_ELEMENT_GET_INTERFACE (element)->set_snd_element (element, el);
+}
+
+gboolean
+alsa_element_load (AlsaElement *element)
+{
+    g_return_val_if_fail (ALSA_IS_ELEMENT (element), FALSE);
+
+    return ALSA_ELEMENT_GET_INTERFACE (element)->load (element);
+}
diff --git a/backends/alsa/alsa-element.h b/backends/alsa/alsa-element.h
new file mode 100644
index 0000000..01d30f1
--- /dev/null
+++ b/backends/alsa/alsa-element.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_ELEMENT_H
+#define ALSA_ELEMENT_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_ELEMENT                       \
+        (alsa_element_get_type ())
+#define ALSA_ELEMENT(o)                         \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_ELEMENT, AlsaElement))
+#define ALSA_IS_ELEMENT(o)                      \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_ELEMENT))
+#define ALSA_ELEMENT_GET_INTERFACE(o)           \
+        (G_TYPE_INSTANCE_GET_INTERFACE ((o), ALSA_TYPE_ELEMENT, AlsaElementInterface))
+
+typedef struct _AlsaElement           AlsaElement; /* dummy object */
+typedef struct _AlsaElementInterface  AlsaElementInterface;
+
+struct _AlsaElementInterface
+{
+    GTypeInterface parent_iface;
+
+    /*< private >*/
+    snd_mixer_elem_t *(*get_snd_element) (AlsaElement      *element);
+    void              (*set_snd_element) (AlsaElement      *element,
+                                          snd_mixer_elem_t *el);
+
+    gboolean          (*load)            (AlsaElement      *element);
+};
+
+GType             alsa_element_get_type        (void) G_GNUC_CONST;
+
+snd_mixer_elem_t *alsa_element_get_snd_element (AlsaElement      *element);
+void              alsa_element_set_snd_element (AlsaElement      *element,
+                                                snd_mixer_elem_t *el);
+
+gboolean          alsa_element_load            (AlsaElement      *element);
+
+G_END_DECLS
+
+#endif /* ALSA_ELEMENT_H */
diff --git a/backends/alsa/alsa-stream-control.c b/backends/alsa/alsa-stream-control.c
new file mode 100644
index 0000000..bc7a937
--- /dev/null
+++ b/backends/alsa/alsa-stream-control.c
@@ -0,0 +1,739 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-constants.h"
+#include "alsa-element.h"
+#include "alsa-stream-control.h"
+
+struct _AlsaStreamControlPrivate
+{
+    AlsaControlData   data;
+    guint32           channel_mask;
+    snd_mixer_elem_t *element;
+};
+
+static void alsa_element_interface_init    (AlsaElementInterface   *iface);
+
+static void alsa_stream_control_class_init (AlsaStreamControlClass *klass);
+static void alsa_stream_control_init       (AlsaStreamControl      *control);
+
+G_DEFINE_ABSTRACT_TYPE_WITH_CODE (AlsaStreamControl, alsa_stream_control,
+                                  MATE_MIXER_TYPE_STREAM_CONTROL,
+                                  G_IMPLEMENT_INTERFACE (ALSA_TYPE_ELEMENT,
+                                                         alsa_element_interface_init))
+
+static snd_mixer_elem_t *       alsa_stream_control_get_snd_element      (AlsaElement             *element);
+static void                     alsa_stream_control_set_snd_element      (AlsaElement             *element,
+                                                                          snd_mixer_elem_t        *el);
+
+static gboolean                 alsa_stream_control_load                 (AlsaElement             *element);
+
+static gboolean                 alsa_stream_control_set_mute             (MateMixerStreamControl  *mmsc,
+                                                                          gboolean                 mute);
+
+static guint                    alsa_stream_control_get_num_channels     (MateMixerStreamControl  *mmsc);
+
+static guint                    alsa_stream_control_get_volume           (MateMixerStreamControl  *mmsc);
+
+static gboolean                 alsa_stream_control_set_volume           (MateMixerStreamControl  *mmsc,
+                                                                          guint                    volume);
+
+static gdouble                  alsa_stream_control_get_decibel          (MateMixerStreamControl  *mmsc);
+
+static gboolean                 alsa_stream_control_set_decibel          (MateMixerStreamControl  *mmsc,
+                                                                          gdouble                  decibel);
+
+static gboolean                 alsa_stream_control_has_channel_position (MateMixerStreamControl  *mmsc,
+                                                                          MateMixerChannelPosition position);
+static MateMixerChannelPosition alsa_stream_control_get_channel_position (MateMixerStreamControl  *mmsc,
+                                                                          guint                    channel);
+
+static guint                    alsa_stream_control_get_channel_volume   (MateMixerStreamControl  *mmsc,
+                                                                          guint                    channel);
+static gboolean                 alsa_stream_control_set_channel_volume   (MateMixerStreamControl  *mmsc,
+                                                                          guint                    channel,
+                                                                          guint                    volume);
+
+static gdouble                  alsa_stream_control_get_channel_decibel  (MateMixerStreamControl  *mmsc,
+                                                                          guint                    channel);
+static gboolean                 alsa_stream_control_set_channel_decibel  (MateMixerStreamControl  *mmsc,
+                                                                          guint                    channel,
+                                                                          gdouble                  decibel);
+
+static gboolean                 alsa_stream_control_set_balance          (MateMixerStreamControl  *mmsc,
+                                                                          gfloat                   balance);
+
+static gboolean                 alsa_stream_control_set_fade             (MateMixerStreamControl  *mmsc,
+                                                                          gfloat                   fade);
+
+static guint                    alsa_stream_control_get_min_volume       (MateMixerStreamControl  *mmsc);
+static guint                    alsa_stream_control_get_max_volume       (MateMixerStreamControl  *mmsc);
+static guint                    alsa_stream_control_get_normal_volume    (MateMixerStreamControl  *mmsc);
+static guint                    alsa_stream_control_get_base_volume      (MateMixerStreamControl  *mmsc);
+
+static void                     control_data_get_average_left_right      (AlsaControlData         *data,
+                                                                          guint                   *left,
+                                                                          guint                   *right);
+static void                     control_data_get_average_front_back      (AlsaControlData         *data,
+                                                                          guint                   *front,
+                                                                          guint                   *back);
+
+static gfloat                   control_data_get_balance                 (AlsaControlData         *data);
+static gfloat                   control_data_get_fade                    (AlsaControlData         *data);
+
+static void
+alsa_element_interface_init (AlsaElementInterface *iface)
+{
+    iface->get_snd_element = alsa_stream_control_get_snd_element;
+    iface->set_snd_element = alsa_stream_control_set_snd_element;
+    iface->load            = alsa_stream_control_load;
+}
+
+static void
+alsa_stream_control_class_init (AlsaStreamControlClass *klass)
+{
+    MateMixerStreamControlClass *control_class;
+
+    control_class = MATE_MIXER_STREAM_CONTROL_CLASS (klass);
+
+    control_class->set_mute             = alsa_stream_control_set_mute;
+    control_class->get_num_channels     = alsa_stream_control_get_num_channels;
+    control_class->get_volume           = alsa_stream_control_get_volume;
+    control_class->set_volume           = alsa_stream_control_set_volume;
+    control_class->get_decibel          = alsa_stream_control_get_decibel;
+    control_class->set_decibel          = alsa_stream_control_set_decibel;
+    control_class->has_channel_position = alsa_stream_control_has_channel_position;
+    control_class->get_channel_position = alsa_stream_control_get_channel_position;
+    control_class->get_channel_volume   = alsa_stream_control_get_channel_volume;
+    control_class->set_channel_volume   = alsa_stream_control_set_channel_volume;
+    control_class->get_channel_decibel  = alsa_stream_control_get_channel_decibel;
+    control_class->set_channel_decibel  = alsa_stream_control_set_channel_decibel;
+    control_class->set_balance          = alsa_stream_control_set_balance;
+    control_class->set_fade             = alsa_stream_control_set_fade;
+    control_class->get_min_volume       = alsa_stream_control_get_min_volume;
+    control_class->get_max_volume       = alsa_stream_control_get_max_volume;
+    control_class->get_normal_volume    = alsa_stream_control_get_normal_volume;
+    control_class->get_base_volume      = alsa_stream_control_get_base_volume;
+
+    g_type_class_add_private (G_OBJECT_CLASS (klass), sizeof (AlsaStreamControlPrivate));
+}
+
+static void
+alsa_stream_control_init (AlsaStreamControl *control)
+{
+    control->priv = G_TYPE_INSTANCE_GET_PRIVATE (control,
+                                                 ALSA_TYPE_STREAM_CONTROL,
+                                                 AlsaStreamControlPrivate);
+}
+
+AlsaControlData *
+alsa_stream_control_get_data (AlsaStreamControl *control)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), NULL);
+
+    return &control->priv->data;
+}
+
+void
+alsa_stream_control_set_data (AlsaStreamControl *control, AlsaControlData *data)
+{
+    MateMixerStreamControlFlags flags = MATE_MIXER_STREAM_CONTROL_NO_FLAGS;
+    MateMixerStreamControl     *mmsc;
+
+    g_return_if_fail (ALSA_IS_STREAM_CONTROL (control));
+    g_return_if_fail (data != NULL);
+
+    mmsc = MATE_MIXER_STREAM_CONTROL (control);
+
+    g_object_freeze_notify (G_OBJECT (control));
+
+    if (data->channels > 0) {
+        if (data->switch_usable == TRUE) {
+            flags |= MATE_MIXER_STREAM_CONTROL_HAS_MUTE;
+            if (data->active == TRUE)
+                flags |= MATE_MIXER_STREAM_CONTROL_CAN_SET_MUTE;
+        }
+        flags |= MATE_MIXER_STREAM_CONTROL_HAS_VOLUME;
+        if (data->active == TRUE)
+            flags |= MATE_MIXER_STREAM_CONTROL_CAN_SET_VOLUME;
+    }
+    if (data->max_decibel > -MATE_MIXER_INFINITY)
+        flags |= MATE_MIXER_STREAM_CONTROL_HAS_DECIBEL;
+
+    control->priv->data = *data;
+    control->priv->channel_mask = _mate_mixer_create_channel_mask (data->c, data->channels);
+
+    if (data->volume_joined == FALSE) {
+        if (MATE_MIXER_CHANNEL_MASK_HAS_LEFT (control->priv->channel_mask) &&
+            MATE_MIXER_CHANNEL_MASK_HAS_RIGHT (control->priv->channel_mask))
+            flags |= MATE_MIXER_STREAM_CONTROL_CAN_BALANCE;
+
+        if (MATE_MIXER_CHANNEL_MASK_HAS_FRONT (control->priv->channel_mask) &&
+            MATE_MIXER_CHANNEL_MASK_HAS_BACK (control->priv->channel_mask))
+            flags |= MATE_MIXER_STREAM_CONTROL_CAN_FADE;
+    }
+
+    _mate_mixer_stream_control_set_flags (mmsc, flags);
+
+    if (data->switch_usable == TRUE) {
+        gboolean mute;
+
+        /* If the mute switch is joined, all the channels get the same value,
+         * otherwise the element has per-channel mute, which we don't support.
+         * In that case, treat the control as unmuted if any channel is
+         * unmuted. */
+        if (data->channels == 1 || data->switch_joined == TRUE) {
+            mute = data->m[0];
+        } else {
+            gint i;
+            mute = TRUE;
+            for (i = 0; i < data->channels; i++)
+                if (data->m[i] == FALSE) {
+                    mute = FALSE;
+                    break;
+                }
+        }
+        _mate_mixer_stream_control_set_mute (mmsc, mute);
+    } else
+        _mate_mixer_stream_control_set_mute (mmsc, FALSE);
+
+    if (flags & MATE_MIXER_STREAM_CONTROL_CAN_BALANCE)
+        _mate_mixer_stream_control_set_balance (mmsc, control_data_get_balance (data));
+    if (flags & MATE_MIXER_STREAM_CONTROL_CAN_FADE)
+        _mate_mixer_stream_control_set_fade (mmsc, control_data_get_fade (data));
+
+    g_object_thaw_notify (G_OBJECT (control));
+}
+
+static snd_mixer_elem_t *
+alsa_stream_control_get_snd_element (AlsaElement *element)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (element), NULL);
+
+    return ALSA_STREAM_CONTROL (element)->priv->element;
+}
+
+static void
+alsa_stream_control_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el)
+{
+    g_return_if_fail (ALSA_IS_STREAM_CONTROL (element));
+    g_return_if_fail (el != NULL);
+
+    ALSA_STREAM_CONTROL (element)->priv->element = el;
+}
+
+static gboolean
+alsa_stream_control_load (AlsaElement *element)
+{
+    AlsaStreamControl *control;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (element), FALSE);
+
+    control = ALSA_STREAM_CONTROL (element);
+
+    return ALSA_STREAM_CONTROL_GET_CLASS (control)->load (control);
+}
+
+static gboolean
+alsa_stream_control_set_mute (MateMixerStreamControl *mmsc, gboolean mute)
+{
+    AlsaStreamControl *control;
+    gboolean           change = FALSE;
+    gint               i;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+
+    /* If the switch is joined, only verify the first channel */
+    if (control->priv->data.switch_joined == TRUE) {
+        if (control->priv->data.m[0] != mute)
+            change = TRUE;
+    } else {
+        /* Avoid trying to set the mute if all channels are already at the
+         * selected mute value */
+        for (i = 0; i < control->priv->data.channels; i++)
+            if (control->priv->data.m[i] != mute) {
+                change = TRUE;
+                break;
+            }
+    }
+
+    if (change == TRUE) {
+        AlsaStreamControlClass *klass;
+
+        klass = ALSA_STREAM_CONTROL_GET_CLASS (control);
+        if (klass->set_mute (control, mute) == FALSE)
+            return FALSE;
+
+        for (i = 0; i < control->priv->data.channels; i++)
+            control->priv->data.m[i] = mute;
+    }
+    return TRUE;
+}
+
+static guint
+alsa_stream_control_get_num_channels (MateMixerStreamControl *mmsc)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), 0);
+
+    return ALSA_STREAM_CONTROL (mmsc)->priv->data.channels;
+}
+
+static guint
+alsa_stream_control_get_volume (MateMixerStreamControl *mmsc)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), 0);
+
+    return ALSA_STREAM_CONTROL (mmsc)->priv->data.volume;
+}
+
+static gboolean
+alsa_stream_control_set_volume (MateMixerStreamControl *mmsc, guint volume)
+{
+    AlsaStreamControl *control;
+    gboolean           change = FALSE;
+    gint               i;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+    volume  = CLAMP (volume, control->priv->data.min, control->priv->data.max);
+
+    /* If the volume is joined, only verify the first channel */
+    if (control->priv->data.volume_joined == TRUE) {
+        if (control->priv->data.v[0] != volume)
+            change = TRUE;
+    } else {
+        /* Avoid trying to set the volume if all channels are already at the
+         * selected volume */
+        for (i = 0; i < control->priv->data.channels; i++)
+            if (control->priv->data.v[i] != volume) {
+                change = TRUE;
+                break;
+            }
+    }
+
+    if (change == TRUE) {
+        AlsaStreamControlClass *klass;
+
+        klass = ALSA_STREAM_CONTROL_GET_CLASS (control);
+        if (klass->set_volume (control, volume) == FALSE)
+            return FALSE;
+
+        for (i = 0; i < control->priv->data.channels; i++)
+            control->priv->data.v[i] = volume;
+
+        g_object_notify (G_OBJECT (control), "volume");
+    }
+    return TRUE;
+}
+
+static gdouble
+alsa_stream_control_get_decibel (MateMixerStreamControl *mmsc)
+{
+    AlsaStreamControl      *control;
+    AlsaStreamControlClass *klass;
+    guint                   volume;
+    gdouble                 decibel;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), -MATE_MIXER_INFINITY);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+    klass   = ALSA_STREAM_CONTROL_GET_CLASS (control);
+    volume  = alsa_stream_control_get_volume (mmsc);
+
+    if (klass->get_decibel_from_volume (control, volume, &decibel) == FALSE)
+        return FALSE;
+
+    return decibel;
+}
+
+static gboolean
+alsa_stream_control_set_decibel (MateMixerStreamControl *mmsc, gdouble decibel)
+{
+    AlsaStreamControl      *control;
+    AlsaStreamControlClass *klass;
+    guint                   volume;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+    klass   = ALSA_STREAM_CONTROL_GET_CLASS (control);
+
+    if (klass->get_volume_from_decibel (control, decibel, &volume) == FALSE)
+        return FALSE;
+
+    return alsa_stream_control_set_volume (mmsc, volume);
+}
+
+static gboolean
+alsa_stream_control_has_channel_position (MateMixerStreamControl  *mmsc,
+                                          MateMixerChannelPosition position)
+{
+    AlsaStreamControl *control;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+
+    if MATE_MIXER_CHANNEL_MASK_HAS_CHANNEL (control->priv->channel_mask, position)
+        return TRUE;
+    else
+        return FALSE;
+}
+
+static MateMixerChannelPosition
+alsa_stream_control_get_channel_position (MateMixerStreamControl *mmsc, guint channel)
+{
+    AlsaStreamControl *control;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), MATE_MIXER_CHANNEL_UNKNOWN);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+
+    if (channel >= control->priv->data.channels)
+        return MATE_MIXER_CHANNEL_UNKNOWN;
+
+    return control->priv->data.c[channel];
+}
+
+static guint
+alsa_stream_control_get_channel_volume (MateMixerStreamControl *mmsc, guint channel)
+{
+    AlsaStreamControl *control;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), 0);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+
+    if (channel >= control->priv->data.channels)
+        return FALSE;
+
+    return control->priv->data.v[channel];
+}
+
+static gboolean
+alsa_stream_control_set_channel_volume (MateMixerStreamControl *mmsc, guint channel, guint volume)
+{
+    AlsaStreamControl *control;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+
+    if (channel >= control->priv->data.channels)
+        return FALSE;
+
+    /* Set volume for all channels at once when channels are joined */
+    if (control->priv->data.volume_joined == TRUE)
+        return alsa_stream_control_set_volume (mmsc, volume);
+
+    if (volume != control->priv->data.v[channel]) {
+        AlsaStreamControlClass *klass;
+
+        /* Convert channel index to ALSA channel position and make sure it is valid */
+        snd_mixer_selem_channel_id_t c = alsa_channel_map_to[control->priv->data.c[channel]];
+        if G_UNLIKELY (c == SND_MIXER_SCHN_UNKNOWN) {
+            g_warn_if_reached ();
+            return FALSE;
+        }
+
+        klass = ALSA_STREAM_CONTROL_GET_CLASS (control);
+        if (klass->set_channel_volume (control, c, volume) == FALSE)
+            return FALSE;
+
+        control->priv->data.v[channel] = volume;
+
+        g_object_notify (G_OBJECT (control), "volume");
+    }
+    return TRUE;
+}
+
+static gdouble
+alsa_stream_control_get_channel_decibel (MateMixerStreamControl *mmsc, guint channel)
+{
+    AlsaStreamControl      *control;
+    AlsaStreamControlClass *klass;
+    guint                   volume;
+    gdouble                 decibel;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), -MATE_MIXER_INFINITY);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+
+    if (channel >= control->priv->data.channels)
+        return FALSE;
+
+    klass  = ALSA_STREAM_CONTROL_GET_CLASS (control);
+    volume = control->priv->data.v[channel];
+
+    if (klass->get_decibel_from_volume (control, volume, &decibel) == FALSE)
+        return FALSE;
+
+    return decibel;
+}
+
+static gboolean
+alsa_stream_control_set_channel_decibel (MateMixerStreamControl *mmsc,
+                                         guint                   channel,
+                                         gdouble                 decibel)
+{
+    AlsaStreamControl      *control;
+    AlsaStreamControlClass *klass;
+    guint                   volume;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+    klass   = ALSA_STREAM_CONTROL_GET_CLASS (control);
+
+    if (klass->get_volume_from_decibel (control, decibel, &volume) == FALSE)
+        return FALSE;
+
+    return alsa_stream_control_set_channel_volume (mmsc, channel, volume);
+}
+
+static gboolean
+alsa_stream_control_set_balance (MateMixerStreamControl *mmsc, gfloat balance)
+{
+    AlsaStreamControlClass *klass;
+    AlsaStreamControl      *control;
+    AlsaControlData        *data;
+    guint                   left,
+                            right;
+    guint                   nleft,
+                            nright;
+    guint                   max;
+    guint                   channel;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+    klass   = ALSA_STREAM_CONTROL_GET_CLASS (control);
+
+    data = &control->priv->data;
+    control_data_get_average_left_right (data, &left, &right);
+
+    max = MAX (left, right);
+    if (balance <= 0) {
+        nright = (balance + 1.0f) * max;
+        nleft  = max;
+    } else {
+        nleft  = (1.0f - balance) * max;
+        nright = max;
+    }
+
+    for (channel = 0; channel < data->channels; channel++) {
+        gboolean lc = MATE_MIXER_IS_LEFT_CHANNEL (data->c[channel]);
+        gboolean rc = MATE_MIXER_IS_RIGHT_CHANNEL (data->c[channel]);
+
+        if (lc == TRUE || rc == TRUE) {
+            guint volume;
+            if (lc == TRUE) {
+                if (left == 0)
+                    volume = nleft;
+                else
+                    volume = CLAMP (((guint64) data->v[channel] * (guint64) nleft) / (guint64) left,
+                                    data->min,
+                                    data->max);
+            } else {
+                if (right == 0)
+                    volume = nright;
+                else
+                    volume = CLAMP (((guint64) data->v[channel] * (guint64) nright) / (guint64) right,
+                                    data->min,
+                                    data->max);
+            }
+
+            if (klass->set_channel_volume (control,
+                                           alsa_channel_map_to[data->c[channel]],
+                                           volume) == TRUE)
+                data->v[channel] = volume;
+        }
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_control_set_fade (MateMixerStreamControl *mmsc, gfloat fade)
+{
+    AlsaStreamControlClass *klass;
+    AlsaStreamControl      *control;
+    AlsaControlData        *data;
+    guint                   front,
+                            back;
+    guint                   nfront,
+                            nback;
+    guint                   max;
+    guint                   channel;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (mmsc), FALSE);
+
+    control = ALSA_STREAM_CONTROL (mmsc);
+    klass   = ALSA_STREAM_CONTROL_GET_CLASS (control);
+
+    data = &control->priv->data;
+    control_data_get_average_front_back (data, &front, &back);
+
+    max = MAX (front, back);
+    if (fade <= 0) {
+        nback  = (fade + 1.0f) * max;
+        nfront = max;
+    } else {
+        nfront = (1.0f - fade) * max;
+        nback  = max;
+    }
+
+    for (channel = 0; channel < data->channels; channel++) {
+        gboolean fc = MATE_MIXER_IS_FRONT_CHANNEL (data->c[channel]);
+        gboolean bc = MATE_MIXER_IS_BACK_CHANNEL (data->c[channel]);
+
+        if (fc == TRUE || bc == TRUE) {
+            guint volume;
+            if (fc == TRUE) {
+                if (front == 0)
+                    volume = nfront;
+                else
+                    volume = CLAMP (((guint64) data->v[channel] * (guint64) nfront) / (guint64) front,
+                                    data->min,
+                                    data->max);
+            } else {
+                if (back == 0)
+                    volume = nback;
+                else
+                    volume = CLAMP (((guint64) data->v[channel] * (guint64) nback) / (guint64) back,
+                                    data->min,
+                                    data->max);
+            }
+
+            if (klass->set_channel_volume (control,
+                                           alsa_channel_map_to[data->c[channel]],
+                                           volume) == TRUE)
+                data->v[channel] = volume;
+        }
+    }
+    return TRUE;
+}
+
+static guint
+alsa_stream_control_get_min_volume (MateMixerStreamControl *msc)
+{
+    return ALSA_STREAM_CONTROL (msc)->priv->data.min;
+}
+
+static guint
+alsa_stream_control_get_max_volume (MateMixerStreamControl *msc)
+{
+    return ALSA_STREAM_CONTROL (msc)->priv->data.max;
+}
+
+static guint
+alsa_stream_control_get_normal_volume (MateMixerStreamControl *msc)
+{
+    return ALSA_STREAM_CONTROL (msc)->priv->data.max;
+}
+
+static guint
+alsa_stream_control_get_base_volume (MateMixerStreamControl *msc)
+{
+    return ALSA_STREAM_CONTROL (msc)->priv->data.max;
+}
+
+static void
+control_data_get_average_left_right (AlsaControlData *data, guint *left, guint *right)
+{
+    guint l = 0,
+          r = 0;
+    guint nl = 0,
+          nr = 0;
+    guint channel;
+
+    for (channel = 0; channel < data->channels; channel++)
+        if MATE_MIXER_IS_LEFT_CHANNEL (data->c[channel]) {
+            l += data->v[channel];
+            nl++;
+        }
+        else if MATE_MIXER_IS_RIGHT_CHANNEL (data->c[channel]) {
+            r += data->v[channel];
+            nr++;
+        }
+
+    *left  = (nl > 0) ? l / nl : data->max;
+    *right = (nr > 0) ? r / nr : data->max;
+}
+
+static void
+control_data_get_average_front_back (AlsaControlData *data, guint *front, guint *back)
+{
+    guint f = 0,
+          b = 0;
+    guint nf = 0,
+          nb = 0;
+    guint channel;
+
+    for (channel = 0; channel < data->channels; channel++)
+        if MATE_MIXER_IS_FRONT_CHANNEL (data->c[channel]) {
+            f += data->v[channel];
+            nf++;
+        }
+        else if MATE_MIXER_IS_RIGHT_CHANNEL (data->c[channel]) {
+            b += data->v[channel];
+            nb++;
+        }
+
+    *front = (nf > 0) ? f / nf : data->max;
+    *back  = (nb > 0) ? b / nb : data->max;
+}
+
+static gfloat
+control_data_get_balance (AlsaControlData *data)
+{
+    guint left;
+    guint right;
+
+    control_data_get_average_left_right (data, &left, &right);
+    if (left == right)
+        return 0.0f;
+
+    if (left > right)
+        return -1.0f + ((gfloat) right / (gfloat) left);
+    else
+        return +1.0f - ((gfloat) left / (gfloat) right);
+}
+
+static gfloat
+control_data_get_fade (AlsaControlData *data)
+{
+    guint front;
+    guint back;
+
+    control_data_get_average_front_back (data, &front, &back);
+    if (front == back)
+        return 0.0f;
+
+    if (front > back)
+        return -1.0f + ((gfloat) back / (gfloat) front);
+    else
+        return +1.0f - ((gfloat) front / (gfloat) back);
+}
diff --git a/backends/alsa/alsa-stream-control.h b/backends/alsa/alsa-stream-control.h
new file mode 100644
index 0000000..f9ac6b6
--- /dev/null
+++ b/backends/alsa/alsa-stream-control.h
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_STREAM_CONTROL_H
+#define ALSA_STREAM_CONTROL_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+#include <libmatemixer/matemixer.h>
+
+G_BEGIN_DECLS
+
+typedef struct {
+    gboolean                 active;
+    MateMixerChannelPosition c[MATE_MIXER_CHANNEL_MAX];
+    guint                    v[MATE_MIXER_CHANNEL_MAX];
+    gboolean                 m[MATE_MIXER_CHANNEL_MAX];
+    guint                    volume;
+    gboolean                 volume_joined;
+    gboolean                 switch_usable;
+    gboolean                 switch_joined;
+    guint                    min;
+    guint                    max;
+    gdouble                  min_decibel;
+    gdouble                  max_decibel;
+    guint                    channels;
+} AlsaControlData;
+
+extern const MateMixerChannelPosition     alsa_channel_map_from[SND_MIXER_SCHN_LAST];
+extern const snd_mixer_selem_channel_id_t alsa_channel_map_to[MATE_MIXER_CHANNEL_MAX];
+
+#define ALSA_TYPE_STREAM_CONTROL                \
+        (alsa_stream_control_get_type ())
+#define ALSA_STREAM_CONTROL(o)                  \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_STREAM_CONTROL, AlsaStreamControl))
+#define ALSA_IS_STREAM_CONTROL(o)               \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_STREAM_CONTROL))
+#define ALSA_STREAM_CONTROL_CLASS(k)            \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_STREAM_CONTROL, AlsaStreamControlClass))
+#define ALSA_IS_STREAM_CONTROL_CLASS(k)         \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_STREAM_CONTROL))
+#define ALSA_STREAM_CONTROL_GET_CLASS(o)        \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_STREAM_CONTROL, AlsaStreamControlClass))
+
+typedef struct _AlsaStreamControl         AlsaStreamControl;
+typedef struct _AlsaStreamControlClass    AlsaStreamControlClass;
+typedef struct _AlsaStreamControlPrivate  AlsaStreamControlPrivate;
+
+struct _AlsaStreamControl
+{
+    MateMixerStreamControl parent;
+
+    /*< private >*/
+    AlsaStreamControlPrivate *priv;
+
+};
+
+struct _AlsaStreamControlClass
+{
+    MateMixerStreamControlClass parent_class;
+
+    /*< private >*/
+    gboolean (*load)                    (AlsaStreamControl           *control);
+
+    gboolean (*set_mute)                (AlsaStreamControl           *control,
+                                         gboolean                     mute);
+
+    gboolean (*set_volume)              (AlsaStreamControl           *control,
+                                         guint                        volume);
+
+    gboolean (*set_channel_volume)      (AlsaStreamControl           *control,
+                                         snd_mixer_selem_channel_id_t channel,
+                                         guint                        volume);
+
+    gboolean (*get_volume_from_decibel) (AlsaStreamControl           *control,
+                                         gdouble                      decibel,
+                                         guint                       *volume);
+
+    gboolean (*get_decibel_from_volume) (AlsaStreamControl           *control,
+                                         guint                        volume,
+                                         gdouble                     *decibel);
+};
+
+GType              alsa_stream_control_get_type        (void) G_GNUC_CONST;
+
+AlsaControlData *  alsa_stream_control_get_data        (AlsaStreamControl         *control);
+
+void               alsa_stream_control_set_data        (AlsaStreamControl         *control,
+                                                        AlsaControlData           *data);
+
+gboolean           alsa_stream_control_set_role        (AlsaStreamControl         *control,
+                                                        MateMixerStreamControlRole role);
+
+G_END_DECLS
+
+#endif /* ALSA_STREAM_CONTROL_H */
diff --git a/backends/alsa/alsa-stream-input-control.c b/backends/alsa/alsa-stream-input-control.c
new file mode 100644
index 0000000..2ef0c42
--- /dev/null
+++ b/backends/alsa/alsa-stream-input-control.c
@@ -0,0 +1,329 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-element.h"
+#include "alsa-stream-control.h"
+#include "alsa-stream-input-control.h"
+
+static void alsa_stream_input_control_class_init (AlsaStreamInputControlClass *klass);
+static void alsa_stream_input_control_init       (AlsaStreamInputControl      *control);
+
+G_DEFINE_TYPE (AlsaStreamInputControl, alsa_stream_input_control, ALSA_TYPE_STREAM_CONTROL)
+
+static gboolean alsa_stream_input_control_load                    (AlsaStreamControl           *control);
+
+static gboolean alsa_stream_input_control_set_mute                (AlsaStreamControl           *control,
+                                                                   gboolean                     mute);
+
+static gboolean alsa_stream_input_control_set_volume              (AlsaStreamControl           *control,
+                                                                   guint                        volume);
+
+static gboolean alsa_stream_input_control_set_channel_volume      (AlsaStreamControl           *control,
+                                                                   snd_mixer_selem_channel_id_t channel,
+                                                                   guint                        volume);
+
+static gboolean alsa_stream_input_control_get_volume_from_decibel (AlsaStreamControl           *control,
+                                                                   gdouble                      decibel,
+                                                                   guint                       *volume);
+
+static gboolean alsa_stream_input_control_get_decibel_from_volume (AlsaStreamControl           *control,
+                                                                   guint                        volume,
+                                                                   gdouble                     *decibel);
+
+static void     read_volume_data (snd_mixer_elem_t *el,
+                                  AlsaControlData  *data);
+
+static void
+alsa_stream_input_control_class_init (AlsaStreamInputControlClass *klass)
+{
+    AlsaStreamControlClass *control_class;
+
+    control_class = ALSA_STREAM_CONTROL_CLASS (klass);
+
+    control_class->load                    = alsa_stream_input_control_load;
+    control_class->set_mute                = alsa_stream_input_control_set_mute;
+    control_class->set_volume              = alsa_stream_input_control_set_volume;
+    control_class->set_channel_volume      = alsa_stream_input_control_set_channel_volume;
+    control_class->get_volume_from_decibel = alsa_stream_input_control_get_volume_from_decibel;
+    control_class->get_decibel_from_volume = alsa_stream_input_control_get_decibel_from_volume;
+}
+
+static void
+alsa_stream_input_control_init (AlsaStreamInputControl *control)
+{
+}
+
+AlsaStreamControl *
+alsa_stream_input_control_new (const gchar               *name,
+                               const gchar               *label,
+                               MateMixerStreamControlRole role)
+{
+    return g_object_new (ALSA_TYPE_STREAM_INPUT_CONTROL,
+                         "name", name,
+                         "label", label,
+                         "role", role,
+                         NULL);
+}
+
+static gboolean
+alsa_stream_input_control_load (AlsaStreamControl *control)
+{
+    AlsaControlData   data;
+    snd_mixer_elem_t *el;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_INPUT_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Expect that the element has a volume control */
+    if G_UNLIKELY (snd_mixer_selem_has_capture_volume (el) == 0 &&
+                   snd_mixer_selem_has_common_volume (el) == 0) {
+        g_warn_if_reached ();
+        return FALSE;
+    }
+
+    memset (&data, 0, sizeof (AlsaControlData));
+
+    /* We model any control switch as mute */
+    if (snd_mixer_selem_has_capture_switch (el) == 1 ||
+        snd_mixer_selem_has_common_switch (el) == 1)
+        data.switch_usable = TRUE;
+
+    data.active = snd_mixer_selem_is_active (el);
+
+    /* Read the volume data but do not error out if it fails, since ALSA reports
+     * the control to have a volume, expect the control to match what we need - slider
+     * with an optional mute toggle.
+     * If it fails to read the volume data, just treat it as a volumeless control */
+    read_volume_data (el, &data);
+
+    alsa_stream_control_set_data (control, &data);
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_input_control_set_mute (AlsaStreamControl *control, gboolean mute)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the switch for all channels */
+    ret = snd_mixer_selem_set_capture_switch_all (el, !mute);
+    if (ret < 0) {
+        g_warning ("Failed to set capture switch: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_input_control_set_volume (AlsaStreamControl *control, guint volume)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the volume for all channels */
+    ret = snd_mixer_selem_set_capture_volume_all (el, volume);
+    if (ret < 0) {
+        g_warning ("Failed to set volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_input_control_set_channel_volume (AlsaStreamControl           *control,
+                                              snd_mixer_selem_channel_id_t channel,
+                                              guint                        volume)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the volume for a single channels, the volume may still be "joined" and
+     * set all the channels by itself */
+    ret = snd_mixer_selem_set_capture_volume (el, channel, volume);
+    if (ret < 0) {
+        g_warning ("Failed to set channel volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_input_control_get_volume_from_decibel (AlsaStreamControl *control,
+                                                   gdouble            decibel,
+                                                   guint             *volume)
+{
+    snd_mixer_elem_t *el;
+    glong             value;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    ret = snd_mixer_selem_ask_capture_dB_vol (el, (glong) (decibel * 100), 0, &value);
+    if (ret < 0) {
+        g_warning ("Failed to convert volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+
+    *volume = value;
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_input_control_get_decibel_from_volume (AlsaStreamControl *control,
+                                                   guint              volume,
+                                                   gdouble           *decibel)
+{
+    snd_mixer_elem_t *el;
+    glong             value;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    ret = snd_mixer_selem_ask_capture_vol_dB (el, (glong) volume, &value);
+    if (ret < 0) {
+        g_warning ("Failed to convert volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+
+    *decibel = value / 100.0;
+    return TRUE;
+}
+
+static void
+read_volume_data (snd_mixer_elem_t *el, AlsaControlData *data)
+{
+    glong volume;
+    glong min, max;
+    gint  ret;
+    gint  i;
+
+    /* Read volume ranges, this call should never fail on valid input */
+    ret = snd_mixer_selem_get_capture_volume_range (el, &min, &max);
+    if G_UNLIKELY (ret < 0) {
+        g_warning ("Failed to read capture volume range: %s", snd_strerror (ret));
+        return;
+    }
+    data->min = (guint) min;
+    data->max = (guint) max;
+
+    /* This fails when decibels are not supported */
+    ret = snd_mixer_selem_get_capture_dB_range (el, &min, &max);
+    if (ret == 0) {
+        data->min_decibel = min / 100.0;
+        data->max_decibel = max / 100.0;
+    } else
+        data->min_decibel = data->max_decibel = -MATE_MIXER_INFINITY;
+
+    for (i = 0; i < MATE_MIXER_CHANNEL_MAX; i++)
+        data->v[i] = data->min;
+
+    data->volume = data->min;
+    data->volume_joined = snd_mixer_selem_has_capture_volume_joined (el);
+
+    if (data->switch_usable == TRUE)
+        data->switch_joined = snd_mixer_selem_has_capture_switch_joined (el);
+
+    if (snd_mixer_selem_is_capture_mono (el) == 1) {
+        /* Special handling for single channel controls */
+        ret = snd_mixer_selem_get_capture_volume (el, SND_MIXER_SCHN_MONO, &volume);
+        if (ret == 0) {
+            data->channels = 1;
+
+            data->c[0] = MATE_MIXER_CHANNEL_MONO;
+            data->v[0] = data->volume = (guint) volume;
+        } else {
+            g_warning ("Failed to read capture volume: %s", snd_strerror (ret));
+        }
+
+        if (data->switch_usable == TRUE) {
+            gint value;
+
+            ret = snd_mixer_selem_get_capture_switch (el, SND_MIXER_SCHN_MONO, &value);
+            if G_LIKELY (ret == 0)
+                data->m[0] = !value;
+        }
+    } else {
+        snd_mixer_selem_channel_id_t channel;
+
+        /* We use numeric channel indices, but ALSA only works with channel
+         * positions, go over all the positions supported by ALSA and create
+         * a list of channels */
+         for (channel = 0; channel < SND_MIXER_SCHN_LAST; channel++) {
+            if (snd_mixer_selem_has_capture_channel (el, channel) == 0)
+                continue;
+
+            if (data->switch_usable == TRUE) {
+                gint value;
+
+                ret = snd_mixer_selem_get_capture_switch (el, channel, &value);
+                if (ret == 0)
+                    data->m[channel] = !value;
+            }
+
+            ret = snd_mixer_selem_get_capture_volume (el, channel, &volume);
+            if (ret < 0) {
+                g_warning ("Failed to read capture volume: %s", snd_strerror (ret));
+                continue;
+            }
+            data->channels++;
+
+            /* The single value volume is the highest channel volume */
+            if (data->volume < volume)
+                data->volume = volume;
+
+            data->c[channel] = alsa_channel_map_from[channel];
+            data->v[channel] = (guint) volume;
+        }
+    }
+}
diff --git a/backends/alsa/alsa-stream-input-control.h b/backends/alsa/alsa-stream-input-control.h
new file mode 100644
index 0000000..c427e3c
--- /dev/null
+++ b/backends/alsa/alsa-stream-input-control.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_STREAM_INPUT_CONTROL_H
+#define ALSA_STREAM_INPUT_CONTROL_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-stream-control.h"
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_STREAM_INPUT_CONTROL          \
+        (alsa_stream_input_control_get_type ())
+#define ALSA_STREAM_INPUT_CONTROL(o)            \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_STREAM_INPUT_CONTROL, AlsaStreamInputControl))
+#define ALSA_IS_STREAM_INPUT_CONTROL(o)         \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_STREAM_INPUT_CONTROL))
+#define ALSA_STREAM_INPUT_CONTROL_CLASS(k)      \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_STREAM_INPUT_CONTROL, AlsaStreamInputControlClass))
+#define ALSA_IS_STREAM_INPUT_CONTROL_CLASS(k)   \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_STREAM_INPUT_CONTROL))
+#define ALSA_STREAM_INPUT_CONTROL_GET_CLASS(o)  \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_STREAM_INPUT_CONTROL, AlsaStreamInputControlClass))
+
+typedef struct _AlsaStreamInputControl         AlsaStreamInputControl;
+typedef struct _AlsaStreamInputControlClass    AlsaStreamInputControlClass;
+typedef struct _AlsaStreamInputControlPrivate  AlsaStreamInputControlPrivate;
+
+struct _AlsaStreamInputControl
+{
+    AlsaStreamControl parent;
+};
+
+struct _AlsaStreamInputControlClass
+{
+    AlsaStreamControlClass parent_class;
+};
+
+GType              alsa_stream_input_control_get_type (void) G_GNUC_CONST;
+
+AlsaStreamControl *alsa_stream_input_control_new      (const gchar               *name,
+                                                       const gchar               *label,
+                                                       MateMixerStreamControlRole role);
+
+G_END_DECLS
+
+#endif /* ALSA_STREAM_INPUT_CONTROL_H */
diff --git a/backends/alsa/alsa-stream-output-control.c b/backends/alsa/alsa-stream-output-control.c
new file mode 100644
index 0000000..5a3e6b3
--- /dev/null
+++ b/backends/alsa/alsa-stream-output-control.c
@@ -0,0 +1,329 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-element.h"
+#include "alsa-stream-control.h"
+#include "alsa-stream-output-control.h"
+
+static void alsa_stream_output_control_class_init (AlsaStreamOutputControlClass *klass);
+static void alsa_stream_output_control_init       (AlsaStreamOutputControl      *control);
+
+G_DEFINE_TYPE (AlsaStreamOutputControl, alsa_stream_output_control, ALSA_TYPE_STREAM_CONTROL)
+
+static gboolean alsa_stream_output_control_load                    (AlsaStreamControl           *control);
+
+static gboolean alsa_stream_output_control_set_mute                (AlsaStreamControl           *control,
+                                                                    gboolean                     mute);
+
+static gboolean alsa_stream_output_control_set_volume              (AlsaStreamControl           *control,
+                                                                    guint                        volume);
+
+static gboolean alsa_stream_output_control_set_channel_volume      (AlsaStreamControl           *control,
+                                                                    snd_mixer_selem_channel_id_t channel,
+                                                                    guint                        volume);
+
+static gboolean alsa_stream_output_control_get_volume_from_decibel (AlsaStreamControl           *control,
+                                                                    gdouble                      decibel,
+                                                                    guint                       *volume);
+
+static gboolean alsa_stream_output_control_get_decibel_from_volume (AlsaStreamControl           *control,
+                                                                    guint                        volume,
+                                                                    gdouble                     *decibel);
+
+static void     read_volume_data (snd_mixer_elem_t *el,
+                                  AlsaControlData  *data);
+
+static void
+alsa_stream_output_control_class_init (AlsaStreamOutputControlClass *klass)
+{
+    AlsaStreamControlClass *control_class;
+
+    control_class = ALSA_STREAM_CONTROL_CLASS (klass);
+
+    control_class->load                    = alsa_stream_output_control_load;
+    control_class->set_mute                = alsa_stream_output_control_set_mute;
+    control_class->set_volume              = alsa_stream_output_control_set_volume;
+    control_class->set_channel_volume      = alsa_stream_output_control_set_channel_volume;
+    control_class->get_volume_from_decibel = alsa_stream_output_control_get_volume_from_decibel;
+    control_class->get_decibel_from_volume = alsa_stream_output_control_get_decibel_from_volume;
+}
+
+static void
+alsa_stream_output_control_init (AlsaStreamOutputControl *control)
+{
+}
+
+AlsaStreamControl *
+alsa_stream_output_control_new (const gchar               *name,
+                                const gchar               *label,
+                                MateMixerStreamControlRole role)
+{
+    return g_object_new (ALSA_TYPE_STREAM_OUTPUT_CONTROL,
+                         "name", name,
+                         "label", label,
+                         "role", role,
+                         NULL);
+}
+
+static gboolean
+alsa_stream_output_control_load (AlsaStreamControl *control)
+{
+    AlsaControlData   data;
+    snd_mixer_elem_t *el;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_OUTPUT_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Expect that the element has a volume control */
+    if G_UNLIKELY (snd_mixer_selem_has_playback_volume (el) == 0 &&
+                   snd_mixer_selem_has_common_volume (el) == 0) {
+        g_warn_if_reached ();
+        return FALSE;
+    }
+
+    memset (&data, 0, sizeof (AlsaControlData));
+
+    /* We model any control switch as mute */
+    if (snd_mixer_selem_has_playback_switch (el) == 1 ||
+        snd_mixer_selem_has_common_switch (el) == 1)
+        data.switch_usable = TRUE;
+
+    data.active = snd_mixer_selem_is_active (el);
+
+    /* Read the volume data but do not error out if it fails, since ALSA reports
+     * the control to have a volume, expect the control to match what we need - slider
+     * with an optional mute toggle.
+     * If it fails to read the volume data, just treat it as a volumeless control */
+    read_volume_data (el, &data);
+
+    alsa_stream_control_set_data (control, &data);
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_set_mute (AlsaStreamControl *control, gboolean mute)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the switch for all channels */
+    ret = snd_mixer_selem_set_playback_switch_all (el, !mute);
+    if (ret < 0) {
+        g_warning ("Failed to set playback switch: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_set_volume (AlsaStreamControl *control, guint volume)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the volume for all channels */
+    ret = snd_mixer_selem_set_playback_volume_all (el, volume);
+    if (ret < 0) {
+        g_warning ("Failed to set volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_set_channel_volume (AlsaStreamControl           *control,
+                                               snd_mixer_selem_channel_id_t channel,
+                                               guint                        volume)
+{
+    snd_mixer_elem_t *el;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    /* Set the volume for a single channels, the volume may still be "joined" and
+     * set all the channels by itself */
+    ret = snd_mixer_selem_set_playback_volume (el, channel, volume);
+    if (ret < 0) {
+        g_warning ("Failed to set channel volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_get_volume_from_decibel (AlsaStreamControl *control,
+                                                    gdouble            decibel,
+                                                    guint             *volume)
+{
+    snd_mixer_elem_t *el;
+    glong             value;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    ret = snd_mixer_selem_ask_playback_dB_vol (el, (glong) (decibel * 100), 0, &value);
+    if (ret < 0) {
+        g_warning ("Failed to convert volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+
+    *volume = value;
+    return TRUE;
+}
+
+static gboolean
+alsa_stream_output_control_get_decibel_from_volume (AlsaStreamControl *control,
+                                                    guint              volume,
+                                                    gdouble           *decibel)
+{
+    snd_mixer_elem_t *el;
+    glong             value;
+    gint              ret;
+
+    g_return_val_if_fail (ALSA_IS_STREAM_CONTROL (control), FALSE);
+
+    el = alsa_element_get_snd_element (ALSA_ELEMENT (control));
+    if G_UNLIKELY (el == NULL)
+        return FALSE;
+
+    ret = snd_mixer_selem_ask_playback_vol_dB (el, (glong) volume, &value);
+    if (ret < 0) {
+        g_warning ("Failed to convert volume: %s", snd_strerror (ret));
+        return FALSE;
+    }
+
+    *decibel = value / 100.0;
+    return TRUE;
+}
+
+static void
+read_volume_data (snd_mixer_elem_t *el, AlsaControlData *data)
+{
+    glong volume;
+    glong min, max;
+    gint  ret;
+    gint  i;
+
+    /* Read volume ranges, this call should never fail on valid input */
+    ret = snd_mixer_selem_get_playback_volume_range (el, &min, &max);
+    if G_UNLIKELY (ret < 0) {
+        g_warning ("Failed to read playback volume range: %s", snd_strerror (ret));
+        return;
+    }
+    data->min = (guint) min;
+    data->max = (guint) max;
+
+    /* This fails when decibels are not supported */
+    ret = snd_mixer_selem_get_playback_dB_range (el, &min, &max);
+    if (ret == 0) {
+        data->min_decibel = min / 100.0;
+        data->max_decibel = max / 100.0;
+    } else
+        data->min_decibel = data->max_decibel = -MATE_MIXER_INFINITY;
+
+    for (i = 0; i < MATE_MIXER_CHANNEL_MAX; i++)
+        data->v[i] = data->min;
+
+    data->volume = data->min;
+    data->volume_joined = snd_mixer_selem_has_playback_volume_joined (el);
+
+    if (data->switch_usable == TRUE)
+        data->switch_joined = snd_mixer_selem_has_playback_switch_joined (el);
+
+    if (snd_mixer_selem_is_playback_mono (el) == 1) {
+        /* Special handling for single channel controls */
+        ret = snd_mixer_selem_get_playback_volume (el, SND_MIXER_SCHN_MONO, &volume);
+        if (ret == 0) {
+            data->channels = 1;
+
+            data->c[0] = MATE_MIXER_CHANNEL_MONO;
+            data->v[0] = data->volume = (guint) volume;
+        } else {
+            g_warning ("Failed to read playback volume: %s", snd_strerror (ret));
+        }
+
+        if (data->switch_usable == TRUE) {
+            gint value;
+
+            ret = snd_mixer_selem_get_playback_switch (el, SND_MIXER_SCHN_MONO, &value);
+            if G_LIKELY (ret == 0)
+                data->m[0] = !value;
+        }
+    } else {
+        snd_mixer_selem_channel_id_t channel;
+
+        /* We use numeric channel indices, but ALSA only works with channel
+         * positions, go over all the positions supported by ALSA and create
+         * a list of channels */
+         for (channel = 0; channel < SND_MIXER_SCHN_LAST; channel++) {
+            if (snd_mixer_selem_has_playback_channel (el, channel) == 0)
+                continue;
+
+            if (data->switch_usable == TRUE) {
+                gint value;
+
+                ret = snd_mixer_selem_get_playback_switch (el, channel, &value);
+                if (ret == 0)
+                    data->m[channel] = !value;
+            }
+
+            ret = snd_mixer_selem_get_playback_volume (el, channel, &volume);
+            if (ret < 0) {
+                g_warning ("Failed to read playback volume: %s", snd_strerror (ret));
+                continue;
+            }
+            data->channels++;
+
+            /* The single value volume is the highest channel volume */
+            if (data->volume < volume)
+                data->volume = volume;
+
+            data->c[channel] = alsa_channel_map_from[channel];
+            data->v[channel] = (guint) volume;
+        }
+    }
+}
diff --git a/backends/alsa/alsa-stream-output-control.h b/backends/alsa/alsa-stream-output-control.h
new file mode 100644
index 0000000..845eaae
--- /dev/null
+++ b/backends/alsa/alsa-stream-output-control.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_STREAM_OUTPUT_CONTROL_H
+#define ALSA_STREAM_OUTPUT_CONTROL_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-stream-control.h"
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_STREAM_OUTPUT_CONTROL         \
+        (alsa_stream_output_control_get_type ())
+#define ALSA_STREAM_OUTPUT_CONTROL(o)           \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_STREAM_OUTPUT_CONTROL, AlsaStreamOutputControl))
+#define ALSA_IS_STREAM_OUTPUT_CONTROL(o)        \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_STREAM_OUTPUT_CONTROL))
+#define ALSA_STREAM_OUTPUT_CONTROL_CLASS(k)     \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_STREAM_OUTPUT_CONTROL, AlsaStreamOutputControlClass))
+#define ALSA_IS_STREAM_OUTPUT_CONTROL_CLASS(k)  \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_STREAM_OUTPUT_CONTROL))
+#define ALSA_STREAM_OUTPUT_CONTROL_GET_CLASS(o) \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_STREAM_OUTPUT_CONTROL, AlsaStreamOutputControlClass))
+
+typedef struct _AlsaStreamOutputControl         AlsaStreamOutputControl;
+typedef struct _AlsaStreamOutputControlClass    AlsaStreamOutputControlClass;
+typedef struct _AlsaStreamOutputControlPrivate  AlsaStreamOutputControlPrivate;
+
+struct _AlsaStreamOutputControl
+{
+    AlsaStreamControl parent;
+};
+
+struct _AlsaStreamOutputControlClass
+{
+    AlsaStreamControlClass parent_class;
+};
+
+GType              alsa_stream_output_control_get_type (void) G_GNUC_CONST;
+
+AlsaStreamControl *alsa_stream_output_control_new      (const gchar               *name,
+                                                        const gchar               *label,
+                                                        MateMixerStreamControlRole role);
+
+G_END_DECLS
+
+#endif /* ALSA_STREAM_OUTPUT_CONTROL_H */
diff --git a/backends/alsa/alsa-stream.c b/backends/alsa/alsa-stream.c
new file mode 100644
index 0000000..d2f68d4
--- /dev/null
+++ b/backends/alsa/alsa-stream.c
@@ -0,0 +1,273 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-element.h"
+#include "alsa-stream.h"
+#include "alsa-stream-control.h"
+#include "alsa-switch.h"
+
+struct _AlsaStreamPrivate
+{
+    GHashTable             *switches;
+    GHashTable             *controls;
+    MateMixerStreamControl *control;
+};
+
+static void alsa_stream_class_init (AlsaStreamClass *klass);
+static void alsa_stream_init       (AlsaStream      *stream);
+static void alsa_stream_dispose    (GObject         *object);
+static void alsa_stream_finalize   (GObject         *object);
+
+G_DEFINE_TYPE (AlsaStream, alsa_stream, MATE_MIXER_TYPE_STREAM)
+
+static MateMixerStreamControl *alsa_stream_get_control         (MateMixerStream *mms,
+                                                                const gchar     *name);
+static MateMixerStreamControl *alsa_stream_get_default_control (MateMixerStream *mms);
+
+static MateMixerSwitch *       alsa_stream_get_switch          (MateMixerStream *mms,
+                                                                const gchar     *name);
+
+static GList *                 alsa_stream_list_controls       (MateMixerStream *mms);
+static GList *                 alsa_stream_list_switches       (MateMixerStream *mms);
+
+static void
+alsa_stream_class_init (AlsaStreamClass *klass)
+{
+    GObjectClass         *object_class;
+    MateMixerStreamClass *stream_class;
+
+    object_class = G_OBJECT_CLASS (klass);
+    object_class->dispose  = alsa_stream_dispose;
+    object_class->finalize = alsa_stream_finalize;
+
+    stream_class = MATE_MIXER_STREAM_CLASS (klass);
+    stream_class->get_control         = alsa_stream_get_control;
+    stream_class->get_default_control = alsa_stream_get_default_control;
+    stream_class->get_switch          = alsa_stream_get_switch;
+    stream_class->list_controls       = alsa_stream_list_controls;
+    stream_class->list_switches       = alsa_stream_list_switches;
+
+    g_type_class_add_private (object_class, sizeof (AlsaStreamPrivate));
+}
+
+static void
+alsa_stream_init (AlsaStream *stream)
+{
+    stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
+                                                ALSA_TYPE_STREAM,
+                                                AlsaStreamPrivate);
+
+    stream->priv->controls = g_hash_table_new_full (g_str_hash,
+                                                    g_str_equal,
+                                                    g_free,
+                                                    g_object_unref);
+
+    stream->priv->switches = g_hash_table_new_full (g_str_hash,
+                                                    g_str_equal,
+                                                    g_free,
+                                                    g_object_unref);
+}
+
+static void
+alsa_stream_dispose (GObject *object)
+{
+    AlsaStream *stream;
+
+    stream = ALSA_STREAM (object);
+
+    g_hash_table_remove_all (stream->priv->controls);
+    g_hash_table_remove_all (stream->priv->switches);
+
+    g_clear_object (&stream->priv->control);
+
+    G_OBJECT_CLASS (alsa_stream_parent_class)->dispose (object);
+}
+
+static void
+alsa_stream_finalize (GObject *object)
+{
+    AlsaStream *stream;
+
+    stream = ALSA_STREAM (object);
+
+    g_hash_table_destroy (stream->priv->controls);
+    g_hash_table_destroy (stream->priv->switches);
+
+    G_OBJECT_CLASS (alsa_stream_parent_class)->finalize (object);
+}
+
+AlsaStream *
+alsa_stream_new (const gchar         *name,
+                 MateMixerDevice     *device,
+                 MateMixerStreamFlags flags)
+{
+    return g_object_new (ALSA_TYPE_STREAM,
+                         "name", name,
+                         "device", device,
+                         "flags", flags,
+                         NULL);
+}
+
+void
+alsa_stream_add_control (AlsaStream *stream, AlsaStreamControl *control)
+{
+    const gchar *name;
+
+    g_return_if_fail (ALSA_IS_STREAM (stream));
+    g_return_if_fail (ALSA_IS_STREAM_CONTROL (control));
+
+    name = mate_mixer_stream_control_get_name (MATE_MIXER_STREAM_CONTROL (control));
+    g_hash_table_insert (stream->priv->controls,
+                         g_strdup (name),
+                         g_object_ref (control));
+}
+
+void
+alsa_stream_add_switch (AlsaStream *stream, AlsaSwitch *swtch)
+{
+    const gchar *name;
+
+    g_return_if_fail (ALSA_IS_STREAM (stream));
+    g_return_if_fail (ALSA_IS_SWITCH (swtch));
+
+    name = mate_mixer_switch_get_name (MATE_MIXER_SWITCH (swtch));
+    g_hash_table_insert (stream->priv->switches,
+                         g_strdup (name),
+                         g_object_ref (swtch));
+}
+
+gboolean
+alsa_stream_is_empty (AlsaStream *stream)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM (stream), FALSE);
+
+    if (g_hash_table_size (stream->priv->controls) > 0 ||
+        g_hash_table_size (stream->priv->switches) > 0)
+        return FALSE;
+
+    return TRUE;
+}
+
+void
+alsa_stream_set_default_control (AlsaStream *stream, AlsaStreamControl *control)
+{
+    g_return_if_fail (ALSA_IS_STREAM (stream));
+    g_return_if_fail (ALSA_IS_STREAM_CONTROL (control));
+
+    /* This function is only used internally so avoid validating that the control
+     * belongs to this stream */
+    if (stream->priv->control != NULL)
+        g_object_unref (stream->priv->control);
+
+    if (control != NULL)
+        stream->priv->control = MATE_MIXER_STREAM_CONTROL (g_object_ref (control));
+    else
+        stream->priv->control = NULL;
+}
+
+void
+alsa_stream_load_elements (AlsaStream *stream, const gchar *name)
+{
+    AlsaElement *element;
+
+    g_return_if_fail (ALSA_IS_STREAM (stream));
+    g_return_if_fail (name != NULL);
+
+    element = g_hash_table_lookup (stream->priv->controls, name);
+    if (element != NULL)
+        alsa_element_load (element);
+
+    element = g_hash_table_lookup (stream->priv->switches, name);
+    if (element != NULL)
+        alsa_element_load (element);
+}
+
+gboolean
+alsa_stream_remove_elements (AlsaStream *stream, const gchar *name)
+{
+    gboolean removed = FALSE;
+
+    g_return_val_if_fail (ALSA_IS_STREAM (stream), FALSE);
+    g_return_val_if_fail (name != NULL, FALSE);
+
+    if (g_hash_table_remove (stream->priv->controls, name) == TRUE)
+        removed = TRUE;
+    if (g_hash_table_remove (stream->priv->switches, name) == TRUE)
+        removed = TRUE;
+
+    return removed;
+}
+
+static MateMixerStreamControl *
+alsa_stream_get_control (MateMixerStream *mms, const gchar *name)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM (mms), NULL);
+
+    return g_hash_table_lookup (ALSA_STREAM (mms)->priv->controls, name);
+}
+
+static MateMixerStreamControl *
+alsa_stream_get_default_control (MateMixerStream *mms)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM (mms), NULL);
+
+    return ALSA_STREAM (mms)->priv->control;
+}
+
+static MateMixerSwitch *
+alsa_stream_get_switch (MateMixerStream *mms, const gchar *name)
+{
+    g_return_val_if_fail (ALSA_IS_STREAM (mms), NULL);
+
+    return g_hash_table_lookup (ALSA_STREAM (mms)->priv->switches, name);
+}
+
+static GList *
+alsa_stream_list_controls (MateMixerStream *mms)
+{
+    GList *list;
+
+    g_return_val_if_fail (ALSA_IS_STREAM (mms), NULL);
+
+    /* Convert the hash table to a linked list, this list is expected to be
+     * cached in the main library */
+    list = g_hash_table_get_values (ALSA_STREAM (mms)->priv->controls);
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+
+    return list;
+}
+
+static GList *
+alsa_stream_list_switches (MateMixerStream *mms)
+{
+    GList *list;
+
+    g_return_val_if_fail (ALSA_IS_STREAM (mms), NULL);
+
+    /* Convert the hash table to a linked list, this list is expected to be
+     * cached in the main library */
+    list = g_hash_table_get_values (ALSA_STREAM (mms)->priv->switches);
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+
+    return list;
+}
diff --git a/backends/alsa/alsa-stream.h b/backends/alsa/alsa-stream.h
new file mode 100644
index 0000000..f26a643
--- /dev/null
+++ b/backends/alsa/alsa-stream.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_STREAM_H
+#define ALSA_STREAM_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-element.h"
+#include "alsa-stream-control.h"
+#include "alsa-switch.h"
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_STREAM                        \
+        (alsa_stream_get_type ())
+#define ALSA_STREAM(o)                          \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_STREAM, AlsaStream))
+#define ALSA_IS_STREAM(o)                       \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_STREAM))
+#define ALSA_STREAM_CLASS(k)                    \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_STREAM, AlsaStreamClass))
+#define ALSA_IS_STREAM_CLASS(k)                 \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_STREAM))
+#define ALSA_STREAM_GET_CLASS(o)                \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_STREAM, AlsaStreamClass))
+
+typedef struct _AlsaStream         AlsaStream;
+typedef struct _AlsaStreamClass    AlsaStreamClass;
+typedef struct _AlsaStreamPrivate  AlsaStreamPrivate;
+
+struct _AlsaStream
+{
+    MateMixerStream parent;
+
+    /*< private >*/
+    AlsaStreamPrivate *priv;
+};
+
+struct _AlsaStreamClass
+{
+    MateMixerStreamClass parent_class;
+};
+
+GType       alsa_stream_get_type            (void) G_GNUC_CONST;
+
+AlsaStream *alsa_stream_new                 (const gchar         *name,
+                                             MateMixerDevice     *device,
+                                             MateMixerStreamFlags flags);
+
+void        alsa_stream_add_control         (AlsaStream          *stream,
+                                             AlsaStreamControl   *control);
+
+void        alsa_stream_add_switch          (AlsaStream          *stream,
+                                             AlsaSwitch          *swtch);
+
+gboolean    alsa_stream_is_empty            (AlsaStream          *stream);
+
+void        alsa_stream_set_default_control (AlsaStream          *stream,
+                                             AlsaStreamControl   *control);
+
+void        alsa_stream_load_elements       (AlsaStream          *stream,
+                                             const gchar         *name);
+
+gboolean    alsa_stream_remove_elements     (AlsaStream          *stream,
+                                             const gchar         *name);
+
+void        alsa_stream_remove_all          (AlsaStream          *stream);
+
+G_END_DECLS
+
+#endif /* ALSA_STREAM_H */
diff --git a/backends/alsa/alsa-switch-option.c b/backends/alsa/alsa-switch-option.c
new file mode 100644
index 0000000..2173113
--- /dev/null
+++ b/backends/alsa/alsa-switch-option.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-switch-option.h"
+
+struct _AlsaSwitchOptionPrivate
+{
+    guint id;
+};
+
+static void alsa_switch_option_class_init (AlsaSwitchOptionClass *klass);
+static void alsa_switch_option_init       (AlsaSwitchOption      *option);
+
+G_DEFINE_TYPE (AlsaSwitchOption, alsa_switch_option, MATE_MIXER_TYPE_SWITCH_OPTION)
+
+static void
+alsa_switch_option_class_init (AlsaSwitchOptionClass *klass)
+{
+    g_type_class_add_private (G_OBJECT_CLASS (klass), sizeof (AlsaSwitchOptionPrivate));
+}
+
+static void
+alsa_switch_option_init (AlsaSwitchOption *option)
+{
+    option->priv = G_TYPE_INSTANCE_GET_PRIVATE (option,
+                                                ALSA_TYPE_SWITCH_OPTION,
+                                                AlsaSwitchOptionPrivate);
+}
+
+AlsaSwitchOption *
+alsa_switch_option_new (const gchar *name,
+                        const gchar *label,
+                        const gchar *icon,
+                        guint        id)
+{
+    AlsaSwitchOption *option;
+
+    option = g_object_new (ALSA_TYPE_SWITCH_OPTION,
+                           "name", name,
+                           "label", label,
+                           NULL);
+
+    option->priv->id = id;
+    return option;
+}
+
+guint
+alsa_switch_option_get_id (AlsaSwitchOption *option)
+{
+    g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (option), 0);
+
+    return option->priv->id;
+}
diff --git a/backends/alsa/alsa-switch-option.h b/backends/alsa/alsa-switch-option.h
new file mode 100644
index 0000000..c2dda87
--- /dev/null
+++ b/backends/alsa/alsa-switch-option.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_SWITCH_OPTION_H
+#define ALSA_SWITCH_OPTION_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_SWITCH_OPTION                        \
+        (alsa_switch_option_get_type ())
+#define ALSA_SWITCH_OPTION(o)                          \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_SWITCH_OPTION, AlsaSwitchOption))
+#define ALSA_IS_SWITCH_OPTION(o)                       \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_SWITCH_OPTION))
+#define ALSA_SWITCH_OPTION_CLASS(k)                    \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_SWITCH_OPTION, AlsaSwitchOptionClass))
+#define ALSA_IS_SWITCH_OPTION_CLASS(k)                 \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_SWITCH_OPTION))
+#define ALSA_SWITCH_OPTION_GET_CLASS(o)                \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_SWITCH_OPTION, AlsaSwitchOptionClass))
+
+typedef struct _AlsaSwitchOption         AlsaSwitchOption;
+typedef struct _AlsaSwitchOptionClass    AlsaSwitchOptionClass;
+typedef struct _AlsaSwitchOptionPrivate  AlsaSwitchOptionPrivate;
+
+struct _AlsaSwitchOption
+{
+    MateMixerSwitchOption parent;
+
+    /*< private >*/
+    AlsaSwitchOptionPrivate *priv;
+};
+
+struct _AlsaSwitchOptionClass
+{
+    MateMixerSwitchOptionClass parent_class;
+};
+
+GType             alsa_switch_option_get_type (void) G_GNUC_CONST;
+
+AlsaSwitchOption *alsa_switch_option_new      (const gchar      *name,
+                                               const gchar      *label,
+                                               const gchar      *icon,
+                                               guint             id);
+
+guint             alsa_switch_option_get_id   (AlsaSwitchOption *option);
+
+G_END_DECLS
+
+#endif /* ALSA_SWITCH_OPTION_H */
diff --git a/backends/alsa/alsa-switch.c b/backends/alsa/alsa-switch.c
new file mode 100644
index 0000000..15151ae
--- /dev/null
+++ b/backends/alsa/alsa-switch.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-element.h"
+#include "alsa-switch.h"
+#include "alsa-switch-option.h"
+
+struct _AlsaSwitchPrivate
+{
+    GList            *options;
+    guint32           channel_mask;
+    snd_mixer_elem_t *element;
+};
+
+static void alsa_element_interface_init (AlsaElementInterface *iface);
+
+static void alsa_switch_class_init      (AlsaSwitchClass      *klass);
+static void alsa_switch_init            (AlsaSwitch           *swtch);
+
+G_DEFINE_TYPE_WITH_CODE (AlsaSwitch, alsa_switch,
+                         MATE_MIXER_TYPE_SWITCH,
+                         G_IMPLEMENT_INTERFACE (ALSA_TYPE_ELEMENT,
+                                                alsa_element_interface_init))
+
+static gboolean               alsa_switch_set_active_option (MateMixerSwitch       *mms,
+                                                             MateMixerSwitchOption *mmso);
+
+static GList *                alsa_switch_list_options      (MateMixerSwitch       *mms);
+
+static snd_mixer_elem_t *     alsa_switch_get_snd_element   (AlsaElement           *element);
+static void                   alsa_switch_set_snd_element   (AlsaElement           *element,
+                                                             snd_mixer_elem_t      *el);
+static gboolean               alsa_switch_load              (AlsaElement           *element);
+
+static void
+alsa_element_interface_init (AlsaElementInterface *iface)
+{
+    iface->get_snd_element = alsa_switch_get_snd_element;
+    iface->set_snd_element = alsa_switch_set_snd_element;
+    iface->load            = alsa_switch_load;
+}
+
+static void
+alsa_switch_class_init (AlsaSwitchClass *klass)
+{
+    MateMixerSwitchClass *switch_class;
+
+    switch_class = MATE_MIXER_SWITCH_CLASS (klass);
+    switch_class->set_active_option = alsa_switch_set_active_option;
+    switch_class->list_options      = alsa_switch_list_options;
+
+    g_type_class_add_private (G_OBJECT_CLASS (klass), sizeof (AlsaSwitchPrivate));
+}
+
+static void
+alsa_switch_init (AlsaSwitch *swtch)
+{
+    swtch->priv = G_TYPE_INSTANCE_GET_PRIVATE (swtch,
+                                               ALSA_TYPE_SWITCH,
+                                               AlsaSwitchPrivate);
+}
+
+AlsaSwitch *
+alsa_switch_new (const gchar *name, const gchar *label, GList *options)
+{
+    AlsaSwitch *swtch;
+
+    swtch = g_object_new (ALSA_TYPE_SWITCH,
+                          "name", name,
+                          "label", label,
+                          NULL);
+
+    /* Takes ownership of options */
+    swtch->priv->options = options;
+    return swtch;
+}
+
+static gboolean
+alsa_switch_set_active_option (MateMixerSwitch *mms, MateMixerSwitchOption *mmso)
+{
+    AlsaSwitch                  *swtch;
+    guint                        index;
+    gboolean                     set_item = FALSE;
+    snd_mixer_selem_channel_id_t channel;
+
+    g_return_val_if_fail (ALSA_IS_SWITCH (mms), FALSE);
+    g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (mmso), FALSE);
+
+    swtch = ALSA_SWITCH (mms);
+
+    /* The channel mask is created when reading the active option the first
+     * time, so a successful load must be done before changing the option */
+    if G_UNLIKELY (swtch->priv->channel_mask == 0) {
+        g_debug ("Not setting active switch option, channel mask unknown");
+        return FALSE;
+    }
+
+    index = alsa_switch_option_get_id (ALSA_SWITCH_OPTION (mmso));
+
+    for (channel = 0; channel < SND_MIXER_SCHN_LAST; channel++) {
+        /* The option is set per-channel, make sure to set it only for channels
+         * we successfully read the value from */
+        if (swtch->priv->channel_mask & (1 << channel)) {
+            gint ret = snd_mixer_selem_set_enum_item (swtch->priv->element,
+                                                      channel,
+                                                      index);
+            if (ret == 0)
+                set_item = TRUE;
+            else
+                g_warning ("Failed to set active option of switch %s: %s",
+                           snd_mixer_selem_get_name (swtch->priv->element),
+                           snd_strerror (ret));
+        }
+    }
+    return set_item;
+}
+
+static GList *
+alsa_switch_list_options (MateMixerSwitch *swtch)
+{
+    g_return_val_if_fail (ALSA_IS_SWITCH (swtch), NULL);
+
+    return ALSA_SWITCH (swtch)->priv->options;
+}
+
+static snd_mixer_elem_t *
+alsa_switch_get_snd_element (AlsaElement *element)
+{
+    g_return_val_if_fail (ALSA_IS_SWITCH (element), NULL);
+
+    return ALSA_SWITCH (element)->priv->element;
+}
+
+static void
+alsa_switch_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el)
+{
+    g_return_if_fail (ALSA_IS_SWITCH (element));
+    g_return_if_fail (el != NULL);
+
+    ALSA_SWITCH (element)->priv->element = el;
+}
+
+static gboolean
+alsa_switch_load (AlsaElement *element)
+{
+    AlsaSwitch                  *swtch;
+    GList                       *list;
+    guint                        item;
+    gint                         ret;
+    snd_mixer_selem_channel_id_t c;
+
+    swtch = ALSA_SWITCH (element);
+
+    /* When reading the first time we try all the channels, otherwise only the
+     * ones which returned success before */
+    if (swtch->priv->channel_mask == 0) {
+        for (c = 0; c < SND_MIXER_SCHN_LAST; c++) {
+            ret = snd_mixer_selem_get_enum_item (swtch->priv->element, c, &item);
+
+            /* The active enum option is set per-channel, so when reading it the
+             * first time, create a mask of all channels for which we read the
+             * value successfully */
+            if (ret == 0)
+                swtch->priv->channel_mask |= 1 << c;
+        }
+
+        /* The last ALSA call might have failed, but it doesn't matter if we have
+         * a channel mask */
+        if (swtch->priv->channel_mask > 0)
+            ret = 0;
+    } else {
+        for (c = 0; !(swtch->priv->channel_mask & (1 << c)); c++)
+            ;
+
+        /* When not reading the mask, the first usable channel is enough, we don't
+         * support per-channel selections anyway */
+        ret = snd_mixer_selem_get_enum_item (swtch->priv->element, c, &item);
+    }
+
+    if (ret < 0) {
+        g_warning ("Failed to read active option of switch %s: %s",
+                   snd_mixer_selem_get_name (swtch->priv->element),
+                   snd_strerror (ret));
+        return FALSE;
+    }
+
+    list = swtch->priv->options;
+    while (list != NULL) {
+        AlsaSwitchOption *option = ALSA_SWITCH_OPTION (list->data);
+
+        /* Mark the selected option when we find it, ALSA indentifies them
+         * by numeric indices */
+        if (alsa_switch_option_get_id (option) == item) {
+            _mate_mixer_switch_set_active_option (MATE_MIXER_SWITCH (swtch),
+                                                  MATE_MIXER_SWITCH_OPTION (option));
+            return TRUE;
+        }
+        list = list->next;
+    }
+
+    g_warning ("Unknown active option of switch %s: %d",
+               snd_mixer_selem_get_name (swtch->priv->element),
+               item);
+
+    return FALSE;
+}
diff --git a/backends/alsa/alsa-switch.h b/backends/alsa/alsa-switch.h
new file mode 100644
index 0000000..fdcfb87
--- /dev/null
+++ b/backends/alsa/alsa-switch.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_SWITCH_H
+#define ALSA_SWITCH_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+G_BEGIN_DECLS
+
+#define ALSA_TYPE_SWITCH                        \
+        (alsa_switch_get_type ())
+#define ALSA_SWITCH(o)                          \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_SWITCH, AlsaSwitch))
+#define ALSA_IS_SWITCH(o)                       \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_SWITCH))
+#define ALSA_SWITCH_CLASS(k)                    \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_SWITCH, AlsaSwitchClass))
+#define ALSA_IS_SWITCH_CLASS(k)                 \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_SWITCH))
+#define ALSA_SWITCH_GET_CLASS(o)                \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_SWITCH, AlsaSwitchClass))
+
+typedef struct _AlsaSwitch         AlsaSwitch;
+typedef struct _AlsaSwitchClass    AlsaSwitchClass;
+typedef struct _AlsaSwitchPrivate  AlsaSwitchPrivate;
+
+struct _AlsaSwitch
+{
+    MateMixerSwitch parent;
+
+    /*< private >*/
+    AlsaSwitchPrivate *priv;
+};
+
+struct _AlsaSwitchClass
+{
+    MateMixerSwitchClass parent_class;
+};
+
+GType       alsa_switch_get_type (void) G_GNUC_CONST;
+
+AlsaSwitch *alsa_switch_new      (const gchar *name,
+                                  const gchar *label,
+                                  GList       *options);
+
+G_END_DECLS
+
+#endif /* ALSA_SWITCH_H */
diff --git a/backends/alsa/alsa-toggle.c b/backends/alsa/alsa-toggle.c
new file mode 100644
index 0000000..efa3460
--- /dev/null
+++ b/backends/alsa/alsa-toggle.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <glib.h>
+#include <glib-object.h>
+#include <alsa/asoundlib.h>
+
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
+
+#include "alsa-element.h"
+#include "alsa-switch-option.h"
+#include "alsa-toggle.h"
+
+struct _AlsaTogglePrivate
+{
+    AlsaToggleType    type;
+    guint32           channel_mask;
+    snd_mixer_elem_t *element;
+};
+
+static void alsa_element_interface_init (AlsaElementInterface *iface);
+
+static void alsa_toggle_class_init      (AlsaToggleClass      *klass);
+static void alsa_toggle_init            (AlsaToggle           *toggle);
+
+G_DEFINE_TYPE_WITH_CODE (AlsaToggle, alsa_toggle, MATE_MIXER_TYPE_TOGGLE,
+                         G_IMPLEMENT_INTERFACE (ALSA_TYPE_ELEMENT,
+                                                alsa_element_interface_init))
+
+static gboolean               alsa_toggle_set_active_option (MateMixerSwitch       *mms,
+                                                             MateMixerSwitchOption *mmso);
+
+static snd_mixer_elem_t *     alsa_toggle_get_snd_element   (AlsaElement           *element);
+static void                   alsa_toggle_set_snd_element   (AlsaElement           *element,
+                                                             snd_mixer_elem_t      *el);
+static gboolean               alsa_toggle_load              (AlsaElement           *element);
+
+static void
+alsa_element_interface_init (AlsaElementInterface *iface)
+{
+    iface->get_snd_element = alsa_toggle_get_snd_element;
+    iface->set_snd_element = alsa_toggle_set_snd_element;
+    iface->load            = alsa_toggle_load;
+}
+
+static void
+alsa_toggle_class_init (AlsaToggleClass *klass)
+{
+    MateMixerSwitchClass *switch_class;
+
+    switch_class = MATE_MIXER_SWITCH_CLASS (klass);
+    switch_class->set_active_option = alsa_toggle_set_active_option;
+
+    g_type_class_add_private (G_OBJECT_CLASS (klass), sizeof (AlsaTogglePrivate));
+}
+
+static void
+alsa_toggle_init (AlsaToggle *toggle)
+{
+    toggle->priv = G_TYPE_INSTANCE_GET_PRIVATE (toggle,
+                                                ALSA_TYPE_TOGGLE,
+                                                AlsaTogglePrivate);
+}
+
+AlsaToggle *
+alsa_toggle_new (const gchar      *name,
+                 const gchar      *label,
+                 AlsaToggleType    type,
+                 AlsaSwitchOption *on,
+                 AlsaSwitchOption *off)
+{
+    AlsaToggle *toggle;
+
+    toggle = g_object_new (ALSA_TYPE_TOGGLE,
+                           "name", name,
+                           "label", label,
+                           "state-option-on", on,
+                           "state-option-off", off,
+                           NULL);
+
+    toggle->priv->type = type;
+    return toggle;
+}
+
+static gboolean
+alsa_toggle_set_active_option (MateMixerSwitch *mms, MateMixerSwitchOption *mmso)
+{
+    AlsaToggle *toggle;
+    gint        value;
+    gint        ret;
+
+    g_return_val_if_fail (ALSA_IS_TOGGLE (mms), FALSE);
+    g_return_val_if_fail (ALSA_IS_SWITCH_OPTION (mmso), FALSE);
+
+    toggle = ALSA_TOGGLE (mms);
+
+    /* For toggles the 0/1 value is stored as the switch option id */
+    value = alsa_switch_option_get_id (ALSA_SWITCH_OPTION (mmso));
+    if G_UNLIKELY (value != 0 && value != 1) {
+        g_warn_if_reached ();
+        return FALSE;
+    }
+
+    if (toggle->priv->type == ALSA_TOGGLE_CAPTURE)
+        ret = snd_mixer_selem_set_capture_switch_all (toggle->priv->element, value);
+    else
+        ret = snd_mixer_selem_set_playback_switch_all (toggle->priv->element, value);
+
+    if (ret < 0) {
+        g_warning ("Failed to set value of toggle %s: %s",
+                   snd_mixer_selem_get_name (toggle->priv->element),
+                   snd_strerror (ret));
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static snd_mixer_elem_t *
+alsa_toggle_get_snd_element (AlsaElement *element)
+{
+    g_return_val_if_fail (ALSA_IS_TOGGLE (element), NULL);
+
+    return ALSA_TOGGLE (element)->priv->element;
+}
+
+static void
+alsa_toggle_set_snd_element (AlsaElement *element, snd_mixer_elem_t *el)
+{
+    g_return_if_fail (ALSA_IS_TOGGLE (element));
+    g_return_if_fail (el != NULL);
+
+    ALSA_TOGGLE (element)->priv->element = el;
+}
+
+static gboolean
+alsa_toggle_load (AlsaElement *element)
+{
+    AlsaToggle                  *toggle;
+    gint                         value;
+    gint                         ret;
+    snd_mixer_selem_channel_id_t c;
+
+    toggle = ALSA_TOGGLE (element);
+
+    /* When reading the first time we try all the channels, otherwise only the
+     * ones which returned success before */
+    if (toggle->priv->channel_mask == 0) {
+        for (c = 0; c < SND_MIXER_SCHN_LAST; c++) {
+            if (toggle->priv->type == ALSA_TOGGLE_CAPTURE)
+                ret = snd_mixer_selem_get_capture_switch (toggle->priv->element,
+                                                          c,
+                                                          &value);
+            else
+                ret = snd_mixer_selem_get_playback_switch (toggle->priv->element,
+                                                           c,
+                                                           &value);
+
+            /* The active enum option is set per-channel, so when reading it the
+             * first time, create a mask of all channels for which we read the
+             * value successfully */
+            if (ret == 0)
+                toggle->priv->channel_mask |= 1 << c;
+        }
+
+        /* The last ALSA call might have failed, but it doesn't matter if we have
+         * a channel mask */
+        if (toggle->priv->channel_mask > 0)
+            ret = 0;
+    } else {
+        for (c = 0; !(toggle->priv->channel_mask & (1 << c)); c++)
+            ;
+
+        /* When not reading the mask, the first usable channel is enough, we don't
+         * support per-channel selections anyway */
+        if (toggle->priv->type == ALSA_TOGGLE_CAPTURE)
+            ret = snd_mixer_selem_get_capture_switch (toggle->priv->element,
+                                                      c,
+                                                      &value);
+        else
+            ret = snd_mixer_selem_get_playback_switch (toggle->priv->element,
+                                                       c,
+                                                       &value);
+    }
+
+    if (ret == 0) {
+        MateMixerSwitchOption *active;
+
+        if (value > 0)
+            active = mate_mixer_toggle_get_state_option (MATE_MIXER_TOGGLE (toggle), TRUE);
+        else
+            active = mate_mixer_toggle_get_state_option (MATE_MIXER_TOGGLE (toggle), FALSE);
+
+        _mate_mixer_switch_set_active_option (MATE_MIXER_SWITCH (toggle), active);
+
+        return TRUE;
+    }
+
+    g_warning ("Failed to read state of toggle %s: %s",
+               snd_mixer_selem_get_name (toggle->priv->element),
+               snd_strerror (ret));
+
+    return FALSE;
+}
diff --git a/backends/alsa/alsa-toggle.h b/backends/alsa/alsa-toggle.h
new file mode 100644
index 0000000..d9c083b
--- /dev/null
+++ b/backends/alsa/alsa-toggle.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the licence, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALSA_TOGGLE_H
+#define ALSA_TOGGLE_H
+
+#include <glib.h>
+#include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+#include "alsa-switch-option.h"
+
+G_BEGIN_DECLS
+
+typedef enum {
+    ALSA_TOGGLE_CAPTURE,
+    ALSA_TOGGLE_PLAYBACK
+} AlsaToggleType;
+
+#define ALSA_TYPE_TOGGLE                        \
+        (alsa_toggle_get_type ())
+#define ALSA_TOGGLE(o)                          \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), ALSA_TYPE_TOGGLE, AlsaToggle))
+#define ALSA_IS_TOGGLE(o)                       \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), ALSA_TYPE_TOGGLE))
+#define ALSA_TOGGLE_CLASS(k)                    \
+        (G_TYPE_CHECK_CLASS_CAST ((k), ALSA_TYPE_TOGGLE, AlsaToggleClass))
+#define ALSA_IS_TOGGLE_CLASS(k)                 \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), ALSA_TYPE_TOGGLE))
+#define ALSA_TOGGLE_GET_CLASS(o)                \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), ALSA_TYPE_TOGGLE, AlsaToggleClass))
+
+typedef struct _AlsaToggle         AlsaToggle;
+typedef struct _AlsaToggleClass    AlsaToggleClass;
+typedef struct _AlsaTogglePrivate  AlsaTogglePrivate;
+
+struct _AlsaToggle
+{
+    MateMixerToggle parent;
+
+    /*< private >*/
+    AlsaTogglePrivate *priv;
+};
+
+struct _AlsaToggleClass
+{
+    MateMixerToggleClass parent_class;
+};
+
+GType       alsa_toggle_get_type (void) G_GNUC_CONST;
+
+AlsaToggle *alsa_toggle_new      (const gchar      *name,
+                                  const gchar      *label,
+                                  AlsaToggleType    type,
+                                  AlsaSwitchOption *on,
+                                  AlsaSwitchOption *off);
+
+G_END_DECLS
+
+#endif /* ALSA_TOGGLE_H */
diff --git a/backends/oss/oss-backend.c b/backends/oss/oss-backend.c
index 6e058f8..2b5eca7 100644
--- a/backends/oss/oss-backend.c
+++ b/backends/oss/oss-backend.c
@@ -19,91 +19,78 @@
 #include <string.h>
 #include <errno.h>
 #include <glib.h>
-#include <glib-object.h>
 #include <glib/gstdio.h>
-#include <glib/gprintf.h>
 #include <glib/gi18n.h>
-#include <gio/gio.h>
+#include <glib-object.h>
 
-#include <libmatemixer/matemixer-backend.h>
-#include <libmatemixer/matemixer-backend-module.h>
-#include <libmatemixer/matemixer-enums.h>
-#include <libmatemixer/matemixer-stream.h>
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
 
 #include "oss-backend.h"
 #include "oss-common.h"
 #include "oss-device.h"
+#include "oss-stream.h"
 
 #define BACKEND_NAME      "OSS"
 #define BACKEND_PRIORITY  9
 
-#define PATH_SNDSTAT      "/dev/sndstat"
+#if !defined(__linux__) && !defined(__NetBSD__) && !defined(__OpenBSD__)
+    /* At least on systems based on FreeBSD we will need to read device names
+     * from the sndstat file, but avoid even trying that on systems where this
+     * is not needed and the file is not present */
+#define OSS_PATH_SNDSTAT  "/dev/sndstat"
+#endif
+
+#define OSS_MAX_DEVICES   32
 
 struct _OssBackendPrivate
 {
-    GFile           *sndstat;
-    GFile           *dev;
-    GFileMonitor    *dev_monitor;
-    GHashTable      *devices;
-    GHashTable      *streams;
-    MateMixerStream *default_input;
-    MateMixerStream *default_output;
-    MateMixerState   state;
-};
-
-enum {
-    PROP_0,
-    PROP_STATE,
-    PROP_DEFAULT_INPUT,
-    PROP_DEFAULT_OUTPUT
+    gchar      *default_device;
+    GSource    *timeout_source;
+    GHashTable *devices;
 };
 
-static void mate_mixer_backend_interface_init (MateMixerBackendInterface *iface);
-
 static void oss_backend_class_init     (OssBackendClass *klass);
 static void oss_backend_class_finalize (OssBackendClass *klass);
-
-static void oss_backend_get_property   (GObject         *object,
-                                        guint            param_id,
-                                        GValue          *value,
-                                        GParamSpec      *pspec);
-
 static void oss_backend_init           (OssBackend      *oss);
 static void oss_backend_dispose        (GObject         *object);
 static void oss_backend_finalize       (GObject         *object);
 
-G_DEFINE_DYNAMIC_TYPE_EXTENDED (OssBackend, oss_backend,
-                                G_TYPE_OBJECT, 0,
-                                G_IMPLEMENT_INTERFACE_DYNAMIC (MATE_MIXER_TYPE_BACKEND,
-                                                               mate_mixer_backend_interface_init))
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-function"
+G_DEFINE_DYNAMIC_TYPE (OssBackend, oss_backend, MATE_MIXER_TYPE_BACKEND)
+#pragma clang diagnostic pop
+
+static gboolean oss_backend_open             (MateMixerBackend *backend);
+static void     oss_backend_close            (MateMixerBackend *backend);
+static GList *  oss_backend_list_devices     (MateMixerBackend *backend);
+static GList *  oss_backend_list_streams     (MateMixerBackend *backend);
 
-static gboolean oss_backend_open         (MateMixerBackend  *backend);
-static void     oss_backend_close        (MateMixerBackend  *backend);
-static GList *  oss_backend_list_devices (MateMixerBackend  *backend);
-static GList *  oss_backend_list_streams (MateMixerBackend  *backend);
+static gboolean read_devices                 (OssBackend       *oss);
 
-static void     change_state                    (OssBackend        *oss,
-                                                 MateMixerState     state);
+static gboolean read_device                  (OssBackend       *oss,
+                                              const gchar      *path,
+                                              gboolean         *added);
 
-static void     on_dev_monitor_changed          (GFileMonitor      *monitor,
-                                                 GFile             *file,
-                                                 GFile             *other_file,
-                                                 GFileMonitorEvent  event_type,
-                                                 OssBackend        *oss);
+static gchar *  read_device_label            (OssBackend       *oss,
+                                              const gchar      *path,
+                                              gint              fd);
 
-static gboolean read_device                     (OssBackend        *oss,
-                                                 const gchar        *path);
+static gchar *  read_device_label_sndstat    (OssBackend       *oss,
+                                              const gchar      *sndstat,
+                                              const gchar      *path,
+                                              guint             index) G_GNUC_UNUSED;
 
-static gchar *  read_device_description         (OssBackend        *oss,
-                                                 const gchar       *path,
-                                                 gint               fd);
-static gchar *  read_device_sndstat_description (const gchar       *path,
-                                                 GFileInputStream  *input);
+static void     add_device                   (OssBackend       *oss,
+                                              OssDevice        *device);
+static void     remove_device                (OssBackend       *oss,
+                                              OssDevice        *device);
 
-static void     add_device                      (OssBackend        *oss,
-                                                 OssDevice         *device);
-static void     remove_device                   (OssBackend        *oss,
-                                                 OssDevice         *device);
+static void     remove_stream                (OssBackend       *oss,
+                                              const gchar      *name);
+
+static void     select_default_input_stream  (OssBackend       *oss);
+static void     select_default_output_stream (OssBackend       *oss);
 
 static MateMixerBackendInfo info;
 
@@ -124,65 +111,31 @@ const MateMixerBackendInfo *backend_module_get_info (void)
 }
 
 static void
-mate_mixer_backend_interface_init (MateMixerBackendInterface *iface)
-{
-    iface->open         = oss_backend_open;
-    iface->close        = oss_backend_close;
-    iface->list_devices = oss_backend_list_devices;
-    iface->list_streams = oss_backend_list_streams;
-}
-
-static void
 oss_backend_class_init (OssBackendClass *klass)
 {
-    GObjectClass *object_class;
+    GObjectClass          *object_class;
+    MateMixerBackendClass *backend_class;
 
     object_class = G_OBJECT_CLASS (klass);
-    object_class->dispose      = oss_backend_dispose;
-    object_class->finalize     = oss_backend_finalize;
-    object_class->get_property = oss_backend_get_property;
+    object_class->dispose  = oss_backend_dispose;
+    object_class->finalize = oss_backend_finalize;
 
-    g_object_class_override_property (object_class, PROP_STATE, "state");
-    g_object_class_override_property (object_class, PROP_DEFAULT_INPUT, "default-input");
-    g_object_class_override_property (object_class, PROP_DEFAULT_OUTPUT, "default-output");
+    backend_class = MATE_MIXER_BACKEND_CLASS (klass);
+    backend_class->open         = oss_backend_open;
+    backend_class->close        = oss_backend_close;
+    backend_class->list_devices = oss_backend_list_devices;
+    backend_class->list_streams = oss_backend_list_streams;
 
     g_type_class_add_private (object_class, sizeof (OssBackendPrivate));
 }
 
-/* Called in the code generated by G_DEFINE_DYNAMIC_TYPE_EXTENDED() */
+/* Called in the code generated by G_DEFINE_DYNAMIC_TYPE() */
 static void
 oss_backend_class_finalize (OssBackendClass *klass)
 {
 }
 
 static void
-oss_backend_get_property (GObject    *object,
-                          guint       param_id,
-                          GValue     *value,
-                          GParamSpec *pspec)
-{
-    OssBackend *oss;
-
-    oss = OSS_BACKEND (object);
-
-    switch (param_id) {
-    case PROP_STATE:
-        g_value_set_enum (value, oss->priv->state);
-        break;
-    case PROP_DEFAULT_INPUT:
-        g_value_set_object (value, oss->priv->default_input);
-        break;
-    case PROP_DEFAULT_OUTPUT:
-        g_value_set_object (value, oss->priv->default_output);
-        break;
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
-
-static void
 oss_backend_init (OssBackend *oss)
 {
     oss->priv = G_TYPE_INSTANCE_GET_PRIVATE (oss,
@@ -193,17 +146,21 @@ oss_backend_init (OssBackend *oss)
                                                 g_str_equal,
                                                 g_free,
                                                 g_object_unref);
-
-    oss->priv->streams = g_hash_table_new_full (g_str_hash,
-                                                g_str_equal,
-                                                g_free,
-                                                g_object_unref);
 }
 
 static void
 oss_backend_dispose (GObject *object)
 {
-    oss_backend_close (MATE_MIXER_BACKEND (object));
+    MateMixerBackend *backend;
+    MateMixerState    state;
+
+    backend = MATE_MIXER_BACKEND (object);
+
+    state = mate_mixer_backend_get_state (backend);
+    if (state != MATE_MIXER_STATE_IDLE)
+        oss_backend_close (backend);
+
+    G_OBJECT_CLASS (oss_backend_parent_class)->dispose (object);
 }
 
 static void
@@ -214,61 +171,34 @@ oss_backend_finalize (GObject *object)
     oss = OSS_BACKEND (object);
 
     g_hash_table_destroy (oss->priv->devices);
-    g_hash_table_destroy (oss->priv->streams);
+
+    G_OBJECT_CLASS (oss_backend_parent_class)->finalize (object);
 }
 
 static gboolean
 oss_backend_open (MateMixerBackend *backend)
 {
     OssBackend *oss;
-    GError     *error = NULL;
-    gint        i;
 
     g_return_val_if_fail (OSS_IS_BACKEND (backend), FALSE);
 
     oss = OSS_BACKEND (backend);
 
-    /* Monitor changes on /dev to catch hot-(un)plugged devices */
-    // XXX works on linux, doesn't on freebsd, what to do on netbsd/openbsd?
-    oss->priv->dev = g_file_new_for_path ("/dev");
-    oss->priv->dev_monitor = g_file_monitor_directory (oss->priv->dev,
-                                                       G_FILE_MONITOR_NONE,
-                                                       NULL,
-                                                       &error);
-    if (oss->priv->dev_monitor != NULL) {
-        g_signal_connect (G_OBJECT (oss->priv->dev_monitor),
-                          "changed",
-                          G_CALLBACK (on_dev_monitor_changed),
-                          oss);
-    } else {
-        g_debug ("Failed to monitor /dev: %s", error->message);
-        g_error_free (error);
-    }
-
-#if !defined(__linux__) && !defined(__NetBSD__) &&  !defined(__OpenBSD__)
-    /* At least on systems based on FreeBSD we will need to read devices names
-     * from the sndstat file, but avoid even trying that on systems where this
-     * is not needed and the file is not present */
-    oss->priv->sndstat = g_file_new_for_path (PATH_SNDSTAT);
-#endif
-
-    for (i = 0; i < 5; i++) {
-        /* According to the OSS documentation the mixer devices are
-         * /dev/mixer0 - /dev/mixer4, of course some systems create them
-         * dynamically but this approach should be good enough */
-        gchar *path = g_strdup_printf ("/dev/mixer%i", i);
-
-        if (read_device (oss, path) == FALSE && i == 0) {
-            /* For the first mixer device check also /dev/mixer, but it
-             * might be a symlink to a real mixer device */
-            if (g_file_test ("/dev/mixer", G_FILE_TEST_IS_SYMLINK) == FALSE)
-                read_device (oss, "/dev/mixer");
-        }
-
-        g_free (path);
-    }
-
-    change_state (oss, MATE_MIXER_STATE_READY);
+    /* Discover added or removed OSS devices every second */
+    oss->priv->timeout_source = g_timeout_source_new_seconds (1);
+    g_source_set_callback (oss->priv->timeout_source,
+                           (GSourceFunc) read_devices,
+                           oss,
+                           NULL);
+    g_source_attach (oss->priv->timeout_source,
+                     g_main_context_get_thread_default ());
+
+    /* Read the initial list of devices so we have some starting point, there
+     * isn't really a way to detect errors here, failing to add a device may
+     * be a device-related problem so make the backend always open successfully */
+    read_devices (oss);
+
+    _mate_mixer_backend_set_state (backend, MATE_MIXER_STATE_READY);
     return TRUE;
 }
 
@@ -281,15 +211,13 @@ oss_backend_close (MateMixerBackend *backend)
 
     oss = OSS_BACKEND (backend);
 
-    g_clear_object (&oss->priv->default_input);
-    g_clear_object (&oss->priv->default_output);
-
-    g_hash_table_remove_all (oss->priv->streams);
+    g_source_destroy (oss->priv->timeout_source);
     g_hash_table_remove_all (oss->priv->devices);
 
-    g_clear_object (&oss->priv->dev_monitor);
-    g_clear_object (&oss->priv->dev);
-    g_clear_object (&oss->priv->sndstat);
+    g_free (oss->priv->default_device);
+    oss->priv->default_device = NULL;
+
+    _mate_mixer_backend_set_state (backend, MATE_MIXER_STATE_IDLE);
 }
 
 static GList *
@@ -299,306 +227,361 @@ oss_backend_list_devices (MateMixerBackend *backend)
 
     g_return_val_if_fail (OSS_IS_BACKEND (backend), NULL);
 
-    /* Convert the hash table to a sorted linked list, this list is expected
-     * to be cached in the main library */
+    /* Convert the hash table to a linked list, this list is expected to be
+     * cached in the main library */
     list = g_hash_table_get_values (OSS_BACKEND (backend)->priv->devices);
-    if (list != NULL) {
+    if (list != NULL)
         g_list_foreach (list, (GFunc) g_object_ref, NULL);
 
-        return list;
-    }
-    return NULL;
+    return list;
 }
 
 static GList *
 oss_backend_list_streams (MateMixerBackend *backend)
 {
-    GList *list;
+    OssBackend    *oss;
+    GHashTableIter iter;
+    gpointer       value;
+    GList         *list = NULL;
 
     g_return_val_if_fail (OSS_IS_BACKEND (backend), NULL);
 
-    /* Convert the hash table to a sorted linked list, this list is expected
-     * to be cached in the main library */
-    list = g_hash_table_get_values (OSS_BACKEND (backend)->priv->streams);
-    if (list != NULL) {
-        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+    oss = OSS_BACKEND (backend);
 
-        return list;
+    /* We don't keep a list or hash table of all streams here, instead walk
+     * through the list of devices and create the list manually, each device
+     * has at most one input and one output stream */
+    g_hash_table_iter_init (&iter, oss->priv->devices);
+
+    while (g_hash_table_iter_next (&iter, NULL, &value)) {
+        OssDevice *device = OSS_DEVICE (value);
+        OssStream *stream;
+
+        stream = oss_device_get_output_stream (device);
+        if (stream != NULL)
+            list = g_list_prepend (list, stream);
+        stream = oss_device_get_input_stream (device);
+        if (stream != NULL)
+            list = g_list_prepend (list, stream);
     }
-    return NULL;
-}
-
-static void
-change_state (OssBackend *oss, MateMixerState state)
-{
-    if (oss->priv->state == state)
-        return;
 
-    oss->priv->state = state;
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
 
-    g_object_notify (G_OBJECT (oss), "state");
+    return list;
 }
 
-static void
-on_dev_monitor_changed (GFileMonitor     *monitor,
-                        GFile            *file,
-                        GFile            *other_file,
-                        GFileMonitorEvent event_type,
-                        OssBackend       *oss)
+static gboolean
+read_devices (OssBackend *oss)
 {
-    gchar *path;
+    gint     i;
+    gboolean added = FALSE;
 
-    if (event_type != G_FILE_MONITOR_EVENT_CREATED &&
-        event_type != G_FILE_MONITOR_EVENT_DELETED)
-        return;
+    for (i = 0; i < OSS_MAX_DEVICES; i++) {
+        gboolean added_current;
+        gchar   *path = g_strdup_printf ("/dev/mixer%i", i);
 
-    path = g_file_get_path (file);
+        /* On recent FreeBSD both /dev/mixer and /dev/mixer0 point to the same
+         * mixer device, on NetBSD and OpenBSD /dev/mixer is a symlink to one
+         * of the real mixer device nodes, on Linux /dev/mixer is the first
+         * device and /dev/mixer1 is the second device.
+         * Handle all of these cases by trying /dev/mixer if /dev/mixer0 fails */
+        if (read_device (oss, path, &added_current) == FALSE && i == 0)
+            read_device (oss, "/dev/mixer", &added_current);
+
+        if (added_current)
+            added = TRUE;
 
-    /* Only handle creation and deletion of mixer devices */
-    if (g_str_has_prefix (path, "/dev/mixer") == FALSE) {
-        g_free (path);
-        return;
-    }
-    if (strcmp (path, "/dev/mixer") == 0 &&
-        g_file_test (path, G_FILE_TEST_IS_SYMLINK) == TRUE) {
         g_free (path);
-        return;
     }
 
-    if (event_type == G_FILE_MONITOR_EVENT_DELETED) {
-        OssDevice *device;
-
-        device = g_hash_table_lookup (oss->priv->devices, path);
-        if (device != NULL)
-            remove_device (oss, device);
-    } else
-        read_device (oss, path);
-
-    g_free (path);
+    /* If any card has been added, make sure we have the most suitable default
+     * input and output streams */
+    if (added == TRUE) {
+        select_default_input_stream (oss);
+        select_default_output_stream (oss);
+    }
+    return G_SOURCE_CONTINUE;
 }
 
 static gboolean
-read_device (OssBackend *oss, const gchar *path)
+read_device (OssBackend *oss, const gchar *path, gboolean *added)
 {
-    OssDevice   *device;
-    gint         fd;
-    gboolean     ret;
-    const gchar *description;
+    OssDevice *device;
+    gint       fd;
+    gchar     *bname;
+    gchar     *label;
 
-    /* We assume that the name and capabilities of a device do not change */
     device = g_hash_table_lookup (oss->priv->devices, path);
-    if (G_UNLIKELY (device != NULL)) {
-        g_debug ("Attempt to re-read already know device %s", path);
-        return TRUE;
-    }
+    *added = FALSE;
 
     fd = g_open (path, O_RDWR, 0);
     if (fd == -1) {
         if (errno != ENOENT && errno != ENXIO)
             g_debug ("%s: %s", path, g_strerror (errno));
+
+        if (device != NULL)
+            remove_device (oss, device);
         return FALSE;
     }
 
-    device = oss_device_new (path, fd);
+    /* Don't proceed if the device is already known, opening the device was
+     * still tested to be absolutely sure that the device is removed it case
+     * it has disappeared, but normally the device's polling facility should
+     * handle this by itself */
+    if (device != NULL) {
+        close (fd);
+        return TRUE;
+    }
 
-    description = read_device_description (oss, path, fd);
-    if (description != NULL)
-        oss_device_set_description (device, description);
-    else
-        oss_device_set_description (device, _("Unknown device"));
+    bname = g_path_get_basename (path);
+    label = read_device_label (oss, path, fd);
 
-    /* Close the descriptor as the device should dup it if it intends
-     * to keep it */
-    g_close (fd, NULL);
+    device = oss_device_new (bname, label, path, fd);
+    g_free (bname);
+    g_free (label);
 
-    ret = oss_device_read (device);
-    if (ret == TRUE)
+    close (fd);
+
+    if ((*added = oss_device_open (device)) == TRUE)
         add_device (oss, device);
 
     g_object_unref (device);
-    return ret;
+    return *added;
 }
 
 static gchar *
-read_device_description (OssBackend *oss, const gchar *path, gint fd)
+read_device_label (OssBackend *oss, const gchar *path, gint fd)
 {
-    struct mixer_info info;
+    guint index;
 
-    if (ioctl (fd, SOUND_MIXER_INFO, &info) == 0) {
-        /* Prefer device name supplied by the system, but this fails on FreeBSD */
-        return g_strdup (info.name);
-    }
+#ifdef SOUND_MIXER_INFO
+    do {
+        struct mixer_info info;
 
-    /* Reading the sndstat file is a bit desperate, but seem to be the only
-     * way to determine the name of the sound card on FreeBSD, it also has an
-     * advantage in being able to find out the default one */
-    if (oss->priv->sndstat != NULL) {
-        GError           *error = NULL;
-        GFileInputStream *input = g_file_read (oss->priv->sndstat, NULL, &error);
-
-        if (input == NULL) {
-            /* The file can only be open by one application, otherwise the call
-             * fails with EBUSY */
-            if (error->code == G_IO_ERROR_BUSY) {
-                g_debug ("Delayed reading %s as it is busy", PATH_SNDSTAT);
-                // XXX use timeout and try again
-            } else {
-                if (error->code == G_IO_ERROR_NOT_FOUND)
-                    g_debug ("Device description is unknown as %s does not exist",
-                             PATH_SNDSTAT);
-                else
-                    g_debug ("%s: %s", PATH_SNDSTAT, error->message);
+        /* Prefer device name supplied by the system, but this calls fails
+         * with EINVAL on FreeBSD */
+        if (ioctl (fd, SOUND_MIXER_INFO, &info) == 0)
+            return g_strdup (info.name);
+    } while (0);
+#endif
 
-                g_clear_object (&oss->priv->sndstat);
-            }
-            g_error_free (error);
-        } else
-            return read_device_sndstat_description (path, input);
-    }
+    index = (guint) g_ascii_strtoull (path + sizeof ("/dev/mixer") - 1,
+                                      NULL,
+                                      10);
+#ifdef OSS_PATH_SNDSTAT
+    /* If the ioctl doesn't succeed, assume that the mixer device number
+     * matches the pcm number in the sndstat file, this is a bit desperate, but
+     * it should be correct on FreeBSD */
+    do {
+        gchar *label;
+
+        label = read_device_label_sndstat (oss, OSS_PATH_SNDSTAT, path, index);
+        if (label != NULL)
+            return label;
+    } while (0);
+#endif
 
-    return NULL;
+    return g_strdup_printf (_("OSS Mixer %d"), index);
 }
 
 static gchar *
-read_device_sndstat_description (const gchar *path, GFileInputStream *input)
+read_device_label_sndstat (OssBackend  *oss,
+                           const gchar *sndstat,
+                           const gchar *path,
+                           guint        index)
 {
-    gchar            *line;
-    gchar            *prefix;
-    gchar            *description = NULL;
-    GDataInputStream *stream;
-
-    if (G_UNLIKELY (g_str_has_prefix (path, "/dev/mixer")) == FALSE) {
-        g_warn_if_reached ();
+    FILE  *fp;
+    gchar *label = NULL;
+    gchar *prefix;
+    gchar  line[512];
+
+    fp = g_fopen (sndstat, "r");
+    if (fp == NULL) {
+        g_debug ("Failed to open %s: %s", sndstat, g_strerror (errno));
         return NULL;
     }
 
-    /* We assume that the mixer device number matches the pcm number in the
-     * sndstat file, this is a bit desperate, but it seems to do the
-     * right thing in practice */
-    prefix = g_strdup_printf ("pcm%u: ",
-                              (guint) g_ascii_strtoull (path + sizeof ("/dev/mixer") - 1,
-                                                        NULL,
-                                                        10));
-
-    stream = g_data_input_stream_new (G_INPUT_STREAM (input));
-
-    while (TRUE) {
-        GError *error = NULL;
-        gchar  *p;
-
-        line = g_data_input_stream_read_line (stream, NULL, NULL, &error);
-        if (line == NULL) {
-            if (error != NULL) {
-                g_warning ("%s: %s", path, error->message);
-                g_error_free (error);
-            }
-            break;
-        }
+    /* Example line:
+     * pcm0: <ATI R6xx (HDMI)> (play) default */
+    prefix = g_strdup_printf ("pcm%u: ", index);
+
+    while (fgets (line, sizeof (line), fp) != NULL) {
+        gchar *p;
 
         if (g_str_has_prefix (line, prefix) == FALSE)
             continue;
 
-        /* Example line:
-         * pcm0: <ATI R6xx (HDMI)> (play) default */
         p = strchr (line, '<');
         if (p != NULL && *p && *(++p)) {
             gchar *end = strchr (p, '>');
 
-            if (end != NULL)
-                description = g_strndup (p, end - p);
-        }
+            if (end != NULL) {
+                label = g_strndup (p, end - p);
 
-        // XXX we can also read "default" at the end of the line
-        // XXX http://ashish.is.lostca.se/2011/05/23/default-sound-device-in-freebsd/
-        if (g_str_has_suffix (line, "default") ||
-            g_str_has_suffix (line, "default)"))
-            ;
+                /* Normally the default OSS device is /dev/dsp, but on FreeBSD
+                 * /dev/dsp doesn't physically exist on the filesystem, but is
+                 * managed by the kernel according to the user-settable default
+                 * device, in sndstat the default card definition ends with the
+                 * word "default" */
+                if (g_str_has_suffix (line, "default")) {
+                    g_free (oss->priv->default_device);
 
-        if (description != NULL)
+                    oss->priv->default_device = g_strdup (path);
+                }
+            } else {
+                g_debug ("Failed to read sndstat line: %s", line);
+            }
             break;
+        }
     }
 
-    g_object_unref (stream);
     g_free (prefix);
+    fclose (fp);
 
-    return description;
+    return label;
 }
 
 static void
 add_device (OssBackend *oss, OssDevice *device)
 {
-    MateMixerStream *stream;
+    const gchar *name;
+
+    name = mate_mixer_device_get_name (MATE_MIXER_DEVICE (device));
 
-    /* Add device, file path is used as the key rather than the name, because
-     * the name is not known until an OssDevice instance is created */
     g_hash_table_insert (oss->priv->devices,
                          g_strdup (oss_device_get_path (device)),
                          g_object_ref (device));
 
-    g_signal_emit_by_name (G_OBJECT (oss),
-                           "device-added",
-                           mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)));
-
-    /* Add streams if they exist */
-    stream = oss_device_get_input_stream (device);
-    if (stream != NULL) {
-        g_hash_table_insert (oss->priv->streams,
-                             g_strdup (mate_mixer_stream_get_name (stream)),
-                             g_object_ref (stream));
-
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-added",
-                               mate_mixer_stream_get_name (stream));
-    }
+    // XXX make device emit it when closed
+    g_signal_connect_swapped (G_OBJECT (device),
+                              "stream-removed",
+                              G_CALLBACK (remove_stream),
+                              oss);
 
-    stream = oss_device_get_output_stream (device);
-    if (stream != NULL) {
-        g_hash_table_insert (oss->priv->streams,
-                             g_strdup (mate_mixer_stream_get_name (stream)),
-                             g_object_ref (stream));
+    g_signal_emit_by_name (G_OBJECT (oss), "device-added", name);
 
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-added",
-                               mate_mixer_stream_get_name (stream));
-    }
+    oss_device_load (device);
 }
 
 static void
 remove_device (OssBackend *oss, OssDevice *device)
 {
+    const gchar *name;
+    const gchar *path;
+
+    path = oss_device_get_path (device);
+    name = mate_mixer_device_get_name (MATE_MIXER_DEVICE (device));
+
+    g_signal_handlers_disconnect_by_func (G_OBJECT (device),
+                                          G_CALLBACK (remove_stream),
+                                          oss);
+
+    // XXX close the device and make it remove streams
+    g_hash_table_remove (oss->priv->devices, path);
+
+    g_signal_emit_by_name (G_OBJECT (oss),
+                           "device-removed",
+                           name);
+}
+
+static void
+remove_stream (OssBackend *oss, const gchar *name)
+{
     MateMixerStream *stream;
-    const gchar     *path;
 
-    /* Remove the device streams first as they are a part of the device */
-    stream = oss_device_get_input_stream (device);
-    if (stream != NULL) {
-        const gchar *name = mate_mixer_stream_get_name (stream);
+    stream = mate_mixer_backend_get_default_input_stream (MATE_MIXER_BACKEND (oss));
+
+    // XXX see if the change happens after stream is removed or before
+    if (stream != NULL && strcmp (mate_mixer_stream_get_name (stream), name) == 0)
+        select_default_input_stream (oss);
+
+    stream = mate_mixer_backend_get_default_output_stream (MATE_MIXER_BACKEND (oss));
+
+    if (stream != NULL && strcmp (mate_mixer_stream_get_name (stream), name) == 0)
+        select_default_output_stream (oss);
+}
 
-        g_hash_table_remove (oss->priv->streams, name);
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-removed",
-                               name);
+static void
+select_default_input_stream (OssBackend *oss)
+{
+    OssDevice *device = NULL;
+    OssStream *stream;
+    gint       i;
+
+    /* Always prefer stream in the "default" device */
+    if (oss->priv->default_device != NULL)
+        device = g_hash_table_lookup (oss->priv->devices, oss->priv->default_device);
+    if (device != NULL) {
+        stream = oss_device_get_input_stream (device);
+        if (stream != NULL) {
+            _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (oss),
+                                                          MATE_MIXER_STREAM (stream));
+            return;
+        }
     }
 
-    stream = oss_device_get_output_stream (device);
-    if (stream != NULL) {
-        const gchar *name = mate_mixer_stream_get_name (stream);
+    for (i = 0; i < OSS_MAX_DEVICES; i++) {
+        gchar *path = g_strdup_printf ("/dev/mixer%i", i);
 
-        g_hash_table_remove (oss->priv->streams, stream);
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-removed",
-                               name);
+        device = g_hash_table_lookup (oss->priv->devices, path);
+        if (device == NULL && i == 0)
+            device = g_hash_table_lookup (oss->priv->devices, "/dev/mixer");
+
+        if (device != NULL) {
+            stream = oss_device_get_input_stream (device);
+            if (stream != NULL) {
+                _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (oss),
+                                                              MATE_MIXER_STREAM (stream));
+                g_free (path);
+                return;
+            }
+        }
+        g_free (path);
     }
 
-    path = oss_device_get_path (device);
+    /* In the worst case unset the default stream */
+    _mate_mixer_backend_set_default_input_stream (MATE_MIXER_BACKEND (oss), NULL);
+}
 
-    /* Remove the device */
-    g_object_ref (device);
+static void
+select_default_output_stream (OssBackend *oss)
+{
+    OssDevice *device = NULL;
+    OssStream *stream;
+    gint       i;
+
+    /* Always prefer stream in the "default" device */
+    if (oss->priv->default_device != NULL)
+        device = g_hash_table_lookup (oss->priv->devices, oss->priv->default_device);
+    if (device != NULL) {
+        stream = oss_device_get_output_stream (device);
+        if (stream != NULL) {
+            _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (oss),
+                                                           MATE_MIXER_STREAM (stream));
+            return;
+        }
+    }
 
-    g_hash_table_remove (oss->priv->devices, path);
-    g_signal_emit_by_name (G_OBJECT (oss),
-                           "device-removed",
-                           mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)));
+    for (i = 0; i < OSS_MAX_DEVICES; i++) {
+        gchar *path = g_strdup_printf ("/dev/mixer%i", i);
 
-    g_object_unref (device);
+        device = g_hash_table_lookup (oss->priv->devices, path);
+        if (device == NULL && i == 0)
+            device = g_hash_table_lookup (oss->priv->devices, "/dev/mixer");
+
+        if (device != NULL) {
+            stream = oss_device_get_output_stream (device);
+            if (stream != NULL) {
+                _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (oss),
+                                                               MATE_MIXER_STREAM (stream));
+                g_free (path);
+                return;
+            }
+        }
+        g_free (path);
+    }
+
+    /* In the worst case unset the default stream */
+    _mate_mixer_backend_set_default_output_stream (MATE_MIXER_BACKEND (oss), NULL);
 }
diff --git a/backends/oss/oss-backend.h b/backends/oss/oss-backend.h
index b766799..325b61c 100644
--- a/backends/oss/oss-backend.h
+++ b/backends/oss/oss-backend.h
@@ -21,6 +21,7 @@
 #include <glib.h>
 #include <glib-object.h>
 
+#include <libmatemixer/matemixer-backend.h>
 #include <libmatemixer/matemixer-backend-module.h>
 
 #define OSS_TYPE_BACKEND                        \
@@ -42,7 +43,7 @@ typedef struct _OssBackendPrivate  OssBackendPrivate;
 
 struct _OssBackend
 {
-    GObject parent;
+    MateMixerBackend parent;
 
     /*< private >*/
     OssBackendPrivate *priv;
@@ -50,7 +51,7 @@ struct _OssBackend
 
 struct _OssBackendClass
 {
-    GObjectClass parent_class;
+    MateMixerBackendClass parent_class;
 };
 
 GType                       oss_backend_get_type   (void) G_GNUC_CONST;
diff --git a/backends/oss/oss-common.h b/backends/oss/oss-common.h
index 7251b86..28a138d 100644
--- a/backends/oss/oss-common.h
+++ b/backends/oss/oss-common.h
@@ -24,6 +24,7 @@
 #include <sys/stat.h>
 #include <sys/ioctl.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 #ifdef HAVE_SYS_SOUNDCARD_H
 #  include <sys/soundcard.h>
diff --git a/backends/oss/oss-device.c b/backends/oss/oss-device.c
index f33ff57..cf51705 100644
--- a/backends/oss/oss-device.c
+++ b/backends/oss/oss-device.c
@@ -22,12 +22,8 @@
 #include <glib/gstdio.h>
 #include <glib-object.h>
 
-#include <libmatemixer/matemixer-device.h>
-#include <libmatemixer/matemixer-enums.h>
-#include <libmatemixer/matemixer-port.h>
-#include <libmatemixer/matemixer-port-private.h>
-#include <libmatemixer/matemixer-stream.h>
-#include <libmatemixer/matemixer-stream-control.h>
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
 
 #include "oss-common.h"
 #include "oss-device.h"
@@ -36,490 +32,373 @@
 
 #define OSS_DEVICE_ICON "audio-card"
 
+typedef enum
+{
+    OSS_DEV_ANY,
+    OSS_DEV_INPUT,
+    OSS_DEV_OUTPUT
+} OssDevType;
+
 typedef struct
 {
     gchar                     *name;
-    gchar                     *description;
+    gchar                     *label;
     MateMixerStreamControlRole role;
-    MateMixerStreamFlags       flags;
-} OssDeviceName;
-
-static const OssDeviceName const oss_devices[] = {
-    { "vol",     N_("Volume"),     MATE_MIXER_STREAM_CONTROL_ROLE_MASTER,  MATE_MIXER_STREAM_OUTPUT },
-    { "bass",    N_("Bass"),       MATE_MIXER_STREAM_CONTROL_ROLE_BASS,    MATE_MIXER_STREAM_OUTPUT },
-    { "treble",  N_("Treble"),     MATE_MIXER_STREAM_CONTROL_ROLE_TREBLE,  MATE_MIXER_STREAM_OUTPUT },
-    { "synth",   N_("Synth"),      MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_INPUT },
-    { "pcm",     N_("PCM"),        MATE_MIXER_STREAM_CONTROL_ROLE_PCM,     MATE_MIXER_STREAM_OUTPUT },
-    { "speaker", N_("Speaker"),    MATE_MIXER_STREAM_CONTROL_ROLE_SPEAKER, MATE_MIXER_STREAM_OUTPUT },
-    { "line",    N_("Line-in"),    MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "mic",     N_("Microphone"), MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "cd",      N_("CD"),         MATE_MIXER_STREAM_CONTROL_ROLE_CD,      MATE_MIXER_STREAM_INPUT },
+    OssDevType                 type;
+} OssDev;
+
+static const OssDev oss_devices[] = {
+    { "vol",     N_("Volume"),     MATE_MIXER_STREAM_CONTROL_ROLE_MASTER,  OSS_DEV_OUTPUT },
+    { "bass",    N_("Bass"),       MATE_MIXER_STREAM_CONTROL_ROLE_BASS,    OSS_DEV_OUTPUT },
+    { "treble",  N_("Treble"),     MATE_MIXER_STREAM_CONTROL_ROLE_TREBLE,  OSS_DEV_OUTPUT },
+    { "synth",   N_("Synth"),      MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_INPUT },
+    { "pcm",     N_("PCM"),        MATE_MIXER_STREAM_CONTROL_ROLE_PCM,     OSS_DEV_OUTPUT },
+    /* OSS manual says this should be the beeper, but Linux OSS seems to assign it to
+     * regular volume control */
+    { "speaker", N_("Speaker"),    MATE_MIXER_STREAM_CONTROL_ROLE_SPEAKER, OSS_DEV_OUTPUT },
+    { "line",    N_("Line-in"),    MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "mic",     N_("Microphone"), MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "cd",      N_("CD"),         MATE_MIXER_STREAM_CONTROL_ROLE_CD,      OSS_DEV_INPUT },
     /* Recording monitor */
-    { "mix",     N_("Mixer"),      MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_OUTPUT },
-    { "pcm2",    N_("PCM-2"),      MATE_MIXER_STREAM_CONTROL_ROLE_PCM,     MATE_MIXER_STREAM_OUTPUT },
+    { "mix",     N_("Mixer"),      MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_OUTPUT },
+    { "pcm2",    N_("PCM-2"),      MATE_MIXER_STREAM_CONTROL_ROLE_PCM,     OSS_DEV_OUTPUT },
     /* Recording level (master input) */
-    { "rec",     N_("Record"),     MATE_MIXER_STREAM_CONTROL_ROLE_MASTER,  MATE_MIXER_STREAM_INPUT },
-    { "igain",   N_("In-gain"),    MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_INPUT },
-    { "ogain",   N_("Out-gain"),   MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_OUTPUT },
-    { "line1",   N_("Line-1"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "line2",   N_("Line-2"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "line3",   N_("Line-3"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "dig1",    N_("Digital-1"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_NO_FLAGS },
-    { "dig2",    N_("Digital-2"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_NO_FLAGS },
-    { "dig3",    N_("Digital-3"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_NO_FLAGS },
-    { "phin",    N_("Phone-in"),   MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "phout",   N_("Phone-out"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_OUTPUT },
-    { "video",   N_("Video"),      MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "radio",   N_("Radio"),      MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    MATE_MIXER_STREAM_INPUT },
-    { "monitor", N_("Monitor"),    MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_OUTPUT },
-    { "depth",   N_("3D-depth"),   MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_OUTPUT },
-    { "center",  N_("3D-center"),  MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_OUTPUT },
-    { "midi",    N_("MIDI"),       MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, MATE_MIXER_STREAM_INPUT }
+    { "rec",     N_("Record"),     MATE_MIXER_STREAM_CONTROL_ROLE_MASTER,  OSS_DEV_INPUT },
+    { "igain",   N_("In-gain"),    MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_INPUT },
+    { "ogain",   N_("Out-gain"),   MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_OUTPUT },
+    { "line1",   N_("Line-1"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "line2",   N_("Line-2"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "line3",   N_("Line-3"),     MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "dig1",    N_("Digital-1"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_ANY },
+    { "dig2",    N_("Digital-2"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_ANY },
+    { "dig3",    N_("Digital-3"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_ANY },
+    { "phin",    N_("Phone-in"),   MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "phout",   N_("Phone-out"),  MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_OUTPUT },
+    { "video",   N_("Video"),      MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "radio",   N_("Radio"),      MATE_MIXER_STREAM_CONTROL_ROLE_PORT,    OSS_DEV_INPUT },
+    { "monitor", N_("Monitor"),    MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_OUTPUT },
+    { "depth",   N_("3D-depth"),   MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_OUTPUT },
+    { "center",  N_("3D-center"),  MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_OUTPUT },
+    { "midi",    N_("MIDI"),       MATE_MIXER_STREAM_CONTROL_ROLE_UNKNOWN, OSS_DEV_INPUT }
 };
 
+#define OSS_N_DEVICES MIN (G_N_ELEMENTS (oss_devices), SOUND_MIXER_NRDEVICES)
+
 struct _OssDevicePrivate
 {
-    gint             fd;
-    gchar           *path;
-    gchar           *name;
-    gchar           *description;
-    MateMixerStream *input;
-    MateMixerStream *output;
-};
-
-enum {
-    PROP_0,
-    PROP_NAME,
-    PROP_DESCRIPTION,
-    PROP_ICON,
-    PROP_ACTIVE_PROFILE,
-    PROP_PATH,
-    PROP_FD
+    gint       fd;
+    gchar     *path;
+    gint       devmask;
+    gint       stereodevs;
+    gint       recmask;
+    gint       recsrc;
+    OssStream *input;
+    OssStream *output;
 };
 
-static void mate_mixer_device_interface_init (MateMixerDeviceInterface *iface);
-
 static void oss_device_class_init   (OssDeviceClass *klass);
-
-static void oss_device_get_property (GObject        *object,
-                                     guint           param_id,
-                                     GValue         *value,
-                                     GParamSpec     *pspec);
-static void oss_device_set_property (GObject        *object,
-                                     guint           param_id,
-                                     const GValue   *value,
-                                     GParamSpec     *pspec);
-
 static void oss_device_init         (OssDevice      *device);
+static void oss_device_dispose      (GObject        *object);
 static void oss_device_finalize     (GObject        *object);
 
-G_DEFINE_TYPE_WITH_CODE (OssDevice, oss_device, G_TYPE_OBJECT,
-                         G_IMPLEMENT_INTERFACE (MATE_MIXER_TYPE_DEVICE,
-                                                mate_mixer_device_interface_init))
+G_DEFINE_TYPE (OssDevice, oss_device, MATE_MIXER_TYPE_DEVICE)
 
-static const gchar *oss_device_get_name        (MateMixerDevice *device);
-static const gchar *oss_device_get_description (MateMixerDevice *device);
-static const gchar *oss_device_get_icon        (MateMixerDevice *device);
+static GList *  oss_device_list_streams    (MateMixerDevice  *device);
 
-static gboolean     read_mixer_devices         (OssDevice       *device);
+static gboolean read_mixer_devices         (OssDevice        *device);
 
-static void
-mate_mixer_device_interface_init (MateMixerDeviceInterface *iface)
-{
-    iface->get_name        = oss_device_get_name;
-    iface->get_description = oss_device_get_description;
-    iface->get_icon        = oss_device_get_icon;
-}
+static gboolean set_stream_default_control (OssStream        *stream,
+                                            OssStreamControl *control,
+                                            gboolean          force);
 
 static void
 oss_device_class_init (OssDeviceClass *klass)
 {
-    GObjectClass *object_class;
+    GObjectClass         *object_class;
+    MateMixerDeviceClass *device_class;
 
     object_class = G_OBJECT_CLASS (klass);
-    object_class->finalize     = oss_device_finalize;
-    object_class->get_property = oss_device_get_property;
-    object_class->set_property = oss_device_set_property;
-
-    g_object_class_install_property (object_class,
-                                     PROP_PATH,
-                                     g_param_spec_string ("path",
-                                                          "Path",
-                                                          "Path to the device",
-                                                          NULL,
-                                                          G_PARAM_CONSTRUCT_ONLY |
-                                                          G_PARAM_READWRITE |
-                                                          G_PARAM_STATIC_STRINGS));
-
-    g_object_class_install_property (object_class,
-                                     PROP_FD,
-                                     g_param_spec_int ("fd",
-                                                       "File descriptor",
-                                                       "File descriptor of the device",
-                                                       G_MININT,
-                                                       G_MAXINT,
-                                                       -1,
-                                                       G_PARAM_CONSTRUCT_ONLY |
-                                                       G_PARAM_READWRITE |
-                                                       G_PARAM_STATIC_STRINGS));
-
-    g_object_class_override_property (object_class, PROP_NAME, "name");
-    g_object_class_override_property (object_class, PROP_DESCRIPTION, "description");
-    g_object_class_override_property (object_class, PROP_ICON, "icon");
-    g_object_class_override_property (object_class, PROP_ACTIVE_PROFILE, "active-profile");
+    object_class->dispose  = oss_device_dispose;
+    object_class->finalize = oss_device_finalize;
+
+    device_class = MATE_MIXER_DEVICE_CLASS (klass);
+    device_class->list_streams = oss_device_list_streams;
 
     g_type_class_add_private (object_class, sizeof (OssDevicePrivate));
 }
 
 static void
-oss_device_get_property (GObject    *object,
-                         guint       param_id,
-                         GValue     *value,
-                         GParamSpec *pspec)
+oss_device_init (OssDevice *device)
 {
-    OssDevice *device;
-
-    device = OSS_DEVICE (object);
-
-    switch (param_id) {
-    case PROP_NAME:
-        g_value_set_string (value, device->priv->name);
-        break;
-    case PROP_DESCRIPTION:
-        g_value_set_string (value, device->priv->description);
-        break;
-    case PROP_ICON:
-        g_value_set_string (value, OSS_DEVICE_ICON);
-        break;
-    case PROP_ACTIVE_PROFILE:
-        /* Not supported */
-        g_value_set_object (value, NULL);
-        break;
-    case PROP_PATH:
-        g_value_set_string (value, device->priv->path);
-        break;
-    case PROP_FD:
-        g_value_set_int (value, device->priv->fd);
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
+    device->priv = G_TYPE_INSTANCE_GET_PRIVATE (device,
+                                                OSS_TYPE_DEVICE,
+                                                OssDevicePrivate);
 }
 
 static void
-oss_device_set_property (GObject      *object,
-                         guint         param_id,
-                         const GValue *value,
-                         GParamSpec   *pspec)
+oss_device_dispose (GObject *object)
 {
     OssDevice *device;
 
     device = OSS_DEVICE (object);
 
-    switch (param_id) {
-    case PROP_PATH:
-        /* Construct-only string */
-        device->priv->path = g_strdup (g_value_get_string (value));
-        break;
-    case PROP_FD:
-        device->priv->fd = dup (g_value_get_int (value));
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
+    g_clear_object (&device->priv->input);
+    g_clear_object (&device->priv->output);
 
-static void
-oss_device_init (OssDevice *device)
-{
-    device->priv = G_TYPE_INSTANCE_GET_PRIVATE (device,
-                                                OSS_TYPE_DEVICE,
-                                                OssDevicePrivate);
+    G_OBJECT_CLASS (oss_device_parent_class)->dispose (object);
 }
 
 static void
 oss_device_finalize (GObject *object)
 {
-    OssDevice *device;
-
-    device = OSS_DEVICE (object);
-
-    g_free (device->priv->name);
-    g_free (device->priv->description);
+    OssDevice *device = OSS_DEVICE (object);
 
-    if (device->priv->fd != -1)
-        g_close (device->priv->fd, NULL);
+    close (device->priv->fd);
 
     G_OBJECT_CLASS (oss_device_parent_class)->finalize (object);
 }
 
 OssDevice *
-oss_device_new (const gchar *path, gint fd)
+oss_device_new (const gchar *name, const gchar *label, const gchar *path, gint fd)
 {
     OssDevice *device;
-    gchar     *basename;
+    gchar     *stream_name;
 
-    g_return_val_if_fail (path != NULL, NULL);
+    g_return_val_if_fail (name  != NULL, NULL);
+    g_return_val_if_fail (label != NULL, NULL);
+    g_return_val_if_fail (path  != NULL, NULL);
 
     device = g_object_new (OSS_TYPE_DEVICE,
-                           "path", path,
-                           "fd", fd,
+                           "name", name,
+                           "label", label,
+                           "icon", OSS_DEVICE_ICON,
                            NULL);
 
-    basename = g_path_get_basename (path);
+    device->priv->fd   = dup (fd);
+    device->priv->path = g_strdup (path);
 
-    device->priv->name = g_strdup_printf ("oss-%s", basename);
-    g_free (basename);
+    stream_name = g_strdup_printf ("oss-input-%s", name);
+    device->priv->input = oss_stream_new (stream_name,
+                                          MATE_MIXER_DEVICE (device),
+                                          MATE_MIXER_STREAM_INPUT);
+    g_free (stream_name);
+
+    stream_name = g_strdup_printf ("oss-output-%s", name);
+    device->priv->output = oss_stream_new (stream_name,
+                                           MATE_MIXER_DEVICE (device),
+                                           MATE_MIXER_STREAM_OUTPUT);
+    g_free (stream_name);
 
     return device;
 }
 
 gboolean
-oss_device_read (OssDevice *device)
+oss_device_open (OssDevice *device)
 {
-    gchar                  *name;
-    gchar                  *basename;
-    MateMixerStreamControl *ctl;
+    gint ret;
 
     g_return_val_if_fail (OSS_IS_DEVICE (device), FALSE);
 
-    // XXX avoid calling this function repeatedly
-
-    g_debug ("Querying device %s (%s)",
+    g_debug ("Opening device %s (%s)",
              device->priv->path,
-             device->priv->description);
-
-    basename = g_path_get_basename (device->priv->path);
-
-    name = g_strdup_printf ("oss-input-%s", basename);
-    device->priv->input = MATE_MIXER_STREAM (oss_stream_new (name,
-                                                             device->priv->description,
-                                                             MATE_MIXER_STREAM_INPUT));
-    g_free (name);
-
-    name = g_strdup_printf ("oss-output-%s", basename);
-    device->priv->output = MATE_MIXER_STREAM (oss_stream_new (name,
-                                                              device->priv->description,
-                                                              MATE_MIXER_STREAM_OUTPUT |
-                                                              MATE_MIXER_STREAM_PORTS_FIXED));
-    g_free (name);
-
-    if (read_mixer_devices (device) == FALSE)
-        return FALSE;
-
-    // XXX prefer active ports as default if there is no default
-
-    ctl = mate_mixer_stream_get_default_control (device->priv->input);
-    if (ctl == NULL) {
-        const GList *list = mate_mixer_stream_list_controls (device->priv->input);
-
-        if (list != NULL) {
-            ctl = MATE_MIXER_STREAM_CONTROL (list->data);
-            oss_stream_set_default_control (OSS_STREAM (device->priv->input),
-                                            OSS_STREAM_CONTROL (ctl));
-        } else
-            g_clear_object (&device->priv->input);
+             mate_mixer_device_get_label (MATE_MIXER_DEVICE (device)));
+
+    /* Read the essential information about the device, these values are not
+     * expected to change and will not be queried */
+    ret = ioctl (device->priv->fd,
+                 MIXER_READ (SOUND_MIXER_DEVMASK),
+                 &device->priv->devmask);
+    if (ret != 0)
+        goto fail;
+
+    ret = ioctl (device->priv->fd,
+                 MIXER_READ (SOUND_MIXER_STEREODEVS),
+                 &device->priv->stereodevs);
+    if (ret < 0)
+        goto fail;
+
+    ret = ioctl (device->priv->fd,
+                 MIXER_READ (SOUND_MIXER_RECMASK),
+                 &device->priv->recmask);
+    if (ret < 0)
+        goto fail;
+
+    /* The recording source mask may change at any time, here we just read
+     * the initial value */
+    ret = ioctl (device->priv->fd,
+                 MIXER_READ (SOUND_MIXER_RECSRC),
+                 &device->priv->recsrc);
+    if (ret < 0)
+        goto fail;
+
+    /* NOTE: Linux also supports SOUND_MIXER_OUTSRC and SOUND_MIXER_OUTMASK which
+     * inform about/enable input->output, we could potentially create toggles
+     * for these, but these constants are not defined on any BSD. */
+
+    return TRUE;
+
+fail:
+    g_warning ("Failed to read device %s: %s",
+               device->priv->path,
+               g_strerror (errno));
+
+    return FALSE;
+}
+
+gboolean
+oss_device_load (OssDevice *device)
+{
+    MateMixerStreamControl *control;
+
+    g_return_val_if_fail (OSS_IS_DEVICE (device), FALSE);
+
+    read_mixer_devices (device);
+
+    control = mate_mixer_stream_get_default_control (MATE_MIXER_STREAM (device->priv->input));
+    if (control == NULL) {
+        // XXX pick something
     }
 
-    if (ctl != NULL)
+    if (control != NULL)
         g_debug ("Default input stream control is %s",
-                 mate_mixer_stream_control_get_description (ctl));
-
-    ctl = mate_mixer_stream_get_default_control (device->priv->output);
-    if (ctl == NULL) {
-        const GList *list = mate_mixer_stream_list_controls (device->priv->output);
-
-        if (list != NULL) {
-            ctl = MATE_MIXER_STREAM_CONTROL (list->data);
-            oss_stream_set_default_control (OSS_STREAM (device->priv->output),
-                                            OSS_STREAM_CONTROL (ctl));
-        } else
-            g_clear_object (&device->priv->output);
+                 mate_mixer_stream_control_get_label (control));
+
+    control = mate_mixer_stream_get_default_control (MATE_MIXER_STREAM (device->priv->output));
+    if (control == NULL) {
+        // XXX pick something
     }
 
-    if (ctl != NULL)
+    if (control != NULL)
         g_debug ("Default output stream control is %s",
-                 mate_mixer_stream_control_get_description (ctl));
+                 mate_mixer_stream_control_get_label (control));
 
     return TRUE;
 }
 
+gint
+oss_device_get_fd (OssDevice *device)
+{
+    g_return_val_if_fail (OSS_IS_DEVICE (device), -1);
+
+    return device->priv->fd;
+}
+
 const gchar *
-oss_device_get_path (OssDevice *odevice)
+oss_device_get_path (OssDevice *device)
 {
-    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
 
-    return odevice->priv->path;
+    return device->priv->path;
 }
 
-MateMixerStream *
-oss_device_get_input_stream (OssDevice *odevice)
+OssStream *
+oss_device_get_input_stream (OssDevice *device)
 {
-    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
 
-    return odevice->priv->input;
+    return device->priv->input;
 }
 
-MateMixerStream *
-oss_device_get_output_stream (OssDevice *odevice)
+OssStream *
+oss_device_get_output_stream (OssDevice *device)
 {
-    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
 
-    return odevice->priv->output;
+    return device->priv->output;
 }
 
-gboolean
-oss_device_set_description (OssDevice *odevice, const gchar *description)
+static GList *
+oss_device_list_streams (MateMixerDevice *mmd)
 {
-    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+    OssDevice *device;
+    GList     *list = NULL;
 
-    if (g_strcmp0 (odevice->priv->description, description) != 0) {
-        g_free (odevice->priv->description);
+    g_return_val_if_fail (OSS_IS_DEVICE (mmd), NULL);
 
-        odevice->priv->description = g_strdup (description);
+    device = OSS_DEVICE (mmd);
 
-        g_object_notify (G_OBJECT (odevice), "description");
-        return TRUE;
-    }
-    return FALSE;
+    if (device->priv->output != NULL)
+        list = g_list_prepend (list, g_object_ref (device->priv->output));
+    if (device->priv->input != NULL)
+        list = g_list_prepend (list, g_object_ref (device->priv->input));
+
+    return list;
 }
 
+#define OSS_MASK_HAS_DEVICE(mask,i) ((gboolean) (((mask) & (1 << (i))) > 0))
+
 static gboolean
 read_mixer_devices (OssDevice *device)
 {
-    gint              devmask,
-                      stereomask,
-                      recmask;
-    gint              ret;
-    gint              i;
-    OssStreamControl *ctl;
-
-    ret = ioctl (device->priv->fd, MIXER_READ (SOUND_MIXER_DEVMASK), &devmask);
-    if (ret < 0)
-        goto fail;
-    ret = ioctl (device->priv->fd, MIXER_READ (SOUND_MIXER_STEREODEVS), &stereomask);
-    if (ret < 0)
-        goto fail;
-    ret = ioctl (device->priv->fd, MIXER_READ (SOUND_MIXER_RECMASK), &recmask);
-    if (ret < 0)
-        goto fail;
+    gint i;
 
-    for (i = 0; i < MIN (G_N_ELEMENTS (oss_devices), SOUND_MIXER_NRDEVICES); i++) {
-        gboolean       stereo;
-        gboolean       input = FALSE;
-        MateMixerPort *port = NULL;
+    for (i = 0; i < OSS_N_DEVICES; i++) {
+        OssStreamControl *control;
+        gboolean          input = FALSE;
 
         /* Skip unavailable controls */
-        if ((devmask & (1 << i)) == 0)
+        if (OSS_MASK_HAS_DEVICE (device->priv->devmask, i) == FALSE)
             continue;
 
-        if ((stereomask & (1 << i)) > 0)
-            stereo = TRUE;
-        else
-            stereo = FALSE;
-
-        if (oss_devices[i].flags == MATE_MIXER_STREAM_NO_FLAGS) {
-            if ((recmask & (1 << i)) > 0)
-                input = TRUE;
+        if (oss_devices[i].type == OSS_DEV_ANY) {
+            input = OSS_MASK_HAS_DEVICE (device->priv->recmask, i);
         }
-        if (oss_devices[i].flags == MATE_MIXER_STREAM_INPUT) {
-            if ((recmask & (1 << i)) == 0) {
-                g_debug ("Skipping non-input device %s", oss_devices[i].name);
-                continue;
-            }
+        else if (oss_devices[i].type == OSS_DEV_INPUT) {
             input = TRUE;
         }
 
-        ctl = oss_stream_control_new (device->priv->fd,
-                                      i,
-                                      oss_devices[i].name,
-                                      oss_devices[i].description,
-                                      stereo);
-
-        if (oss_devices[i].role == MATE_MIXER_STREAM_CONTROL_ROLE_PORT)
-            port = _mate_mixer_port_new (oss_devices[i].name,
-                                         oss_devices[i].description,
-                                         NULL,
-                                         0,
-                                         0);
+        control = oss_stream_control_new (oss_devices[i].name,
+                                          oss_devices[i].label,
+                                          oss_devices[i].role,
+                                          device->priv->fd,
+                                          i,
+                                          OSS_MASK_HAS_DEVICE (device->priv->stereodevs, i));
 
         if (input == TRUE) {
-            oss_stream_add_control (OSS_STREAM (device->priv->input), ctl);
+            oss_stream_add_control (OSS_STREAM (device->priv->input), control);
 
             if (i == SOUND_MIXER_RECLEV || i == SOUND_MIXER_IGAIN) {
-                if (i == SOUND_MIXER_RECLEV) {
-                    oss_stream_set_default_control (OSS_STREAM (device->priv->input), ctl);
-                } else {
-                    MateMixerStreamControl *defctl;
-
-                    defctl = mate_mixer_stream_get_default_control (device->priv->input);
-                    if (defctl == NULL)
-                        oss_stream_set_default_control (OSS_STREAM (device->priv->input), ctl);
-                }
+                if (i == SOUND_MIXER_RECLEV)
+                    set_stream_default_control (OSS_STREAM (device->priv->input),
+                                                control,
+                                                TRUE);
+                else
+                    set_stream_default_control (OSS_STREAM (device->priv->input),
+                                                control,
+                                                FALSE);
             }
-
-            if (port != NULL)
-                oss_stream_add_port (OSS_STREAM (device->priv->input), port);
         } else {
-            oss_stream_add_control (OSS_STREAM (device->priv->output), ctl);
-
-            if (i == SOUND_MIXER_VOLUME) {
-                oss_stream_set_default_control (OSS_STREAM (device->priv->output), ctl);
-            }
-            else if (i == SOUND_MIXER_PCM) {
-                MateMixerStreamControl *defctl;
-
-                defctl = mate_mixer_stream_get_default_control (device->priv->output);
-                if (defctl == NULL)
-                    oss_stream_set_default_control (OSS_STREAM (device->priv->output), ctl);
+            oss_stream_add_control (OSS_STREAM (device->priv->output), control);
+
+            if (i == SOUND_MIXER_VOLUME || i == SOUND_MIXER_PCM) {
+                if (i == SOUND_MIXER_VOLUME)
+                    set_stream_default_control (OSS_STREAM (device->priv->output),
+                                                control,
+                                                TRUE);
+                else
+                    set_stream_default_control (OSS_STREAM (device->priv->output),
+                                                control,
+                                                FALSE);
             }
-
-            if (port != NULL)
-                oss_stream_add_port (OSS_STREAM (device->priv->output), port);
         }
 
-        if (port != NULL)
-            oss_stream_control_set_port (ctl, port);
-
-        oss_stream_control_set_role (ctl, oss_devices[i].role);
-
         g_debug ("Added control %s",
-                 mate_mixer_stream_control_get_description (MATE_MIXER_STREAM_CONTROL (ctl)));
+                 mate_mixer_stream_control_get_label (MATE_MIXER_STREAM_CONTROL (control)));
 
-        oss_stream_control_update (ctl);
+        oss_stream_control_update (control);
     }
     return TRUE;
-
-fail:
-    g_warning ("Failed to read device %s: %s",
-               device->priv->path,
-               g_strerror (errno));
-
-    return FALSE;
 }
 
-static const gchar *
-oss_device_get_name (MateMixerDevice *device)
-{
-    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
-
-    return OSS_DEVICE (device)->priv->name;
-}
-
-static const gchar *
-oss_device_get_description (MateMixerDevice *device)
-{
-    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
-
-    return OSS_DEVICE (device)->priv->description;
-}
-
-static const gchar *
-oss_device_get_icon (MateMixerDevice *device)
+static gboolean
+set_stream_default_control (OssStream *stream, OssStreamControl *control, gboolean force)
 {
-    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
+    MateMixerStreamControl *current;
 
-    return OSS_DEVICE_ICON;
+    current = mate_mixer_stream_get_default_control (MATE_MIXER_STREAM (stream));
+    if (current == NULL || force == TRUE) {
+        oss_stream_set_default_control (stream, OSS_STREAM_CONTROL (control));
+        return TRUE;
+    }
+    return FALSE;
 }
diff --git a/backends/oss/oss-device.h b/backends/oss/oss-device.h
index fe40eb2..261a884 100644
--- a/backends/oss/oss-device.h
+++ b/backends/oss/oss-device.h
@@ -20,6 +20,9 @@
 
 #include <glib.h>
 #include <glib-object.h>
+#include <libmatemixer/matemixer.h>
+
+#include "oss-stream.h"
 
 G_BEGIN_DECLS
 
@@ -42,7 +45,7 @@ typedef struct _OssDevicePrivate  OssDevicePrivate;
 
 struct _OssDevice
 {
-    GObject parent;
+    MateMixerDevice parent;
 
     /*< private >*/
     OssDevicePrivate *priv;
@@ -50,23 +53,24 @@ struct _OssDevice
 
 struct _OssDeviceClass
 {
-    GObjectClass parent;
+    MateMixerDeviceClass parent;
 };
 
-GType            oss_device_get_type          (void) G_GNUC_CONST;
-
-OssDevice *      oss_device_new               (const gchar *path,
-                                               gint         fd);
+GType        oss_device_get_type          (void) G_GNUC_CONST;
 
-gboolean         oss_device_read              (OssDevice   *device);
+OssDevice *  oss_device_new               (const gchar *name,
+                                           const gchar *label,
+                                           const gchar *path,
+                                           gint         fd);
 
-const gchar *    oss_device_get_path          (OssDevice   *odevice);
+gboolean     oss_device_open              (OssDevice   *device);
+gboolean     oss_device_load              (OssDevice   *device);
 
-MateMixerStream *oss_device_get_input_stream  (OssDevice   *odevice);
-MateMixerStream *oss_device_get_output_stream (OssDevice   *odevice);
+gint         oss_device_get_fd            (OssDevice   *device);
+const gchar *oss_device_get_path          (OssDevice   *device);
 
-gboolean         oss_device_set_description   (OssDevice   *odevice,
-                                               const gchar *description);
+OssStream *  oss_device_get_input_stream  (OssDevice   *device);
+OssStream *  oss_device_get_output_stream (OssDevice   *device);
 
 G_END_DECLS
 
diff --git a/backends/oss/oss-stream-control.c b/backends/oss/oss-stream-control.c
index 0b1db26..5161528 100644
--- a/backends/oss/oss-stream-control.c
+++ b/backends/oss/oss-stream-control.c
@@ -15,14 +15,13 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <unistd.h>
 #include <errno.h>
 #include <glib.h>
 #include <glib/gstdio.h>
 #include <glib-object.h>
 
-#include <libmatemixer/matemixer-port.h>
-#include <libmatemixer/matemixer-stream-control.h>
+#include <libmatemixer/matemixer.h>
+#include <libmatemixer/matemixer-private.h>
 
 #include "oss-common.h"
 #include "oss-stream-control.h"
@@ -30,437 +29,279 @@
 struct _OssStreamControlPrivate
 {
     gint                        fd;
-    gint                        dev_number;
-    gchar                      *name;
-    gchar                      *description;
+    gint                        devnum;
     guint                       volume[2];
     gfloat                      balance;
     gboolean                    stereo;
-    MateMixerPort              *port;
     MateMixerStreamControlRole  role;
     MateMixerStreamControlFlags flags;
 };
 
-enum {
-    PROP_0,
-    PROP_NAME,
-    PROP_DESCRIPTION,
-    PROP_FLAGS,
-    PROP_MUTE,
-    PROP_VOLUME,
-    PROP_BALANCE,
-    PROP_FADE,
-    PROP_FD,
-    PROP_DEV_NUMBER,
-    PROP_STEREO
-};
-
-static void mate_mixer_stream_control_interface_init (MateMixerStreamControlInterface *iface);
-
-static void oss_stream_control_class_init   (OssStreamControlClass *klass);
+static void oss_stream_control_class_init (OssStreamControlClass *klass);
 
-static void oss_stream_control_get_property (GObject               *object,
-                                             guint                  param_id,
-                                             GValue                *value,
-                                             GParamSpec            *pspec);
-static void oss_stream_control_set_property (GObject               *object,
-                                             guint                  param_id,
-                                             const GValue          *value,
-                                             GParamSpec            *pspec);
+static void oss_stream_control_init       (OssStreamControl      *control);
+static void oss_stream_control_finalize   (GObject               *object);
 
-static void oss_stream_control_init         (OssStreamControl      *octl);
-static void oss_stream_control_finalize     (GObject               *object);
+G_DEFINE_TYPE (OssStreamControl, oss_stream_control, MATE_MIXER_TYPE_STREAM_CONTROL)
 
-G_DEFINE_TYPE_WITH_CODE (OssStreamControl, oss_stream_control, G_TYPE_OBJECT,
-                         G_IMPLEMENT_INTERFACE (MATE_MIXER_TYPE_STREAM_CONTROL,
-                                                mate_mixer_stream_control_interface_init))
+static gboolean                 oss_stream_control_set_mute             (MateMixerStreamControl  *mmsc,
+                                                                         gboolean                 mute);
 
-static const gchar *            oss_stream_control_get_name             (MateMixerStreamControl  *ctl);
-static const gchar *            oss_stream_control_get_description      (MateMixerStreamControl  *ctl);
+static guint                    oss_stream_control_get_num_channels     (MateMixerStreamControl  *mmsc);
 
-static guint                    oss_stream_control_get_num_channels     (MateMixerStreamControl  *ctl);
+static guint                    oss_stream_control_get_volume           (MateMixerStreamControl  *mmsc);
 
-static gboolean                 oss_stream_control_set_volume           (MateMixerStreamControl  *ctl,
+static gboolean                 oss_stream_control_set_volume           (MateMixerStreamControl  *mmsc,
                                                                          guint                    volume);
 
-static guint                    oss_stream_control_get_channel_volume   (MateMixerStreamControl  *ctl,
+static gboolean                 oss_stream_control_has_channel_position (MateMixerStreamControl  *mmsc,
+                                                                         MateMixerChannelPosition position);
+static MateMixerChannelPosition oss_stream_control_get_channel_position (MateMixerStreamControl  *mmsc,
                                                                          guint                    channel);
-static gboolean                 oss_stream_control_set_channel_volume   (MateMixerStreamControl  *ctl,
-                                                                         guint                    channel,
-                                                                         guint                    volume);
 
-static MateMixerChannelPosition oss_stream_control_get_channel_position (MateMixerStreamControl  *ctl,
+static guint                    oss_stream_control_get_channel_volume   (MateMixerStreamControl  *mmsc,
                                                                          guint                    channel);
-static gboolean                 oss_stream_control_has_channel_position (MateMixerStreamControl  *ctl,
-                                                                         MateMixerChannelPosition position);
+static gboolean                 oss_stream_control_set_channel_volume   (MateMixerStreamControl  *mmsc,
+                                                                         guint                    channel,
+                                                                         guint                    volume);
 
-static gboolean                 oss_stream_control_set_balance          (MateMixerStreamControl  *ctl,
+static gboolean                 oss_stream_control_set_balance          (MateMixerStreamControl  *mmsc,
                                                                          gfloat                   balance);
 
-static guint                    oss_stream_control_get_min_volume       (MateMixerStreamControl  *ctl);
-static guint                    oss_stream_control_get_max_volume       (MateMixerStreamControl  *ctl);
-static guint                    oss_stream_control_get_normal_volume    (MateMixerStreamControl  *ctl);
-static guint                    oss_stream_control_get_base_volume      (MateMixerStreamControl  *ctl);
+static guint                    oss_stream_control_get_min_volume       (MateMixerStreamControl  *mmsc);
+static guint                    oss_stream_control_get_max_volume       (MateMixerStreamControl  *mmsc);
+static guint                    oss_stream_control_get_normal_volume    (MateMixerStreamControl  *mmsc);
+static guint                    oss_stream_control_get_base_volume      (MateMixerStreamControl  *mmsc);
 
-static void
-mate_mixer_stream_control_interface_init (MateMixerStreamControlInterface *iface)
-{
-    iface->get_name             = oss_stream_control_get_name;
-    iface->get_description      = oss_stream_control_get_description;
-    iface->get_num_channels     = oss_stream_control_get_num_channels;
-    iface->set_volume           = oss_stream_control_set_volume;
-    iface->get_channel_volume   = oss_stream_control_get_channel_volume;
-    iface->set_channel_volume   = oss_stream_control_set_channel_volume;
-    iface->get_channel_position = oss_stream_control_get_channel_position;
-    iface->has_channel_position = oss_stream_control_has_channel_position;
-    iface->set_balance          = oss_stream_control_set_balance;
-    iface->get_min_volume       = oss_stream_control_get_min_volume;
-    iface->get_max_volume       = oss_stream_control_get_max_volume;
-    iface->get_normal_volume    = oss_stream_control_get_normal_volume;
-    iface->get_base_volume      = oss_stream_control_get_base_volume;
-}
+static gboolean                 write_volume                            (OssStreamControl        *control,
+                                                                         gint                     volume);
 
 static void
 oss_stream_control_class_init (OssStreamControlClass *klass)
 {
-    GObjectClass *object_class;
+    GObjectClass                *object_class;
+    MateMixerStreamControlClass *control_class;
 
     object_class = G_OBJECT_CLASS (klass);
-    object_class->finalize     = oss_stream_control_finalize;
-    object_class->get_property = oss_stream_control_get_property;
-    object_class->set_property = oss_stream_control_set_property;
-
-    g_object_class_install_property (object_class,
-                                     PROP_FD,
-                                     g_param_spec_int ("fd",
-                                                       "File descriptor",
-                                                       "File descriptor of the device",
-                                                       G_MININT,
-                                                       G_MAXINT,
-                                                       -1,
-                                                       G_PARAM_CONSTRUCT_ONLY |
-                                                       G_PARAM_READWRITE |
-                                                       G_PARAM_STATIC_STRINGS));
-
-    g_object_class_install_property (object_class,
-                                     PROP_DEV_NUMBER,
-                                     g_param_spec_int ("dev-number",
-                                                       "Dev number",
-                                                       "OSS device number",
-                                                       G_MININT,
-                                                       G_MAXINT,
-                                                       0,
-                                                       G_PARAM_CONSTRUCT_ONLY |
-                                                       G_PARAM_READWRITE |
-                                                       G_PARAM_STATIC_STRINGS));
-
-    g_object_class_install_property (object_class,
-                                     PROP_STEREO,
-                                     g_param_spec_boolean ("stereo",
-                                                           "Stereo",
-                                                           "Stereo",
-                                                           FALSE,
-                                                           G_PARAM_CONSTRUCT_ONLY |
-                                                           G_PARAM_READWRITE |
-                                                           G_PARAM_STATIC_STRINGS));
-
-    g_object_class_override_property (object_class, PROP_NAME, "name");
-    g_object_class_override_property (object_class, PROP_DESCRIPTION, "description");
-    g_object_class_override_property (object_class, PROP_FLAGS, "flags");
-    g_object_class_override_property (object_class, PROP_MUTE, "mute");
-    g_object_class_override_property (object_class, PROP_VOLUME, "volume");
-    g_object_class_override_property (object_class, PROP_BALANCE, "balance");
-    g_object_class_override_property (object_class, PROP_FADE, "fade");
+    object_class->finalize = oss_stream_control_finalize;
+
+    control_class = MATE_MIXER_STREAM_CONTROL_CLASS (klass);
+    control_class->set_mute             = oss_stream_control_set_mute;
+    control_class->get_num_channels     = oss_stream_control_get_num_channels;
+    control_class->get_volume           = oss_stream_control_get_volume;
+    control_class->set_volume           = oss_stream_control_set_volume;
+    control_class->get_channel_volume   = oss_stream_control_get_channel_volume;
+    control_class->set_channel_volume   = oss_stream_control_set_channel_volume;
+    control_class->get_channel_position = oss_stream_control_get_channel_position;
+    control_class->has_channel_position = oss_stream_control_has_channel_position;
+    control_class->set_balance          = oss_stream_control_set_balance;
+    control_class->get_min_volume       = oss_stream_control_get_min_volume;
+    control_class->get_max_volume       = oss_stream_control_get_max_volume;
+    control_class->get_normal_volume    = oss_stream_control_get_normal_volume;
+    control_class->get_base_volume      = oss_stream_control_get_base_volume;
 
     g_type_class_add_private (object_class, sizeof (OssStreamControlPrivate));
 }
 
 static void
-oss_stream_control_get_property (GObject    *object,
-                                 guint       param_id,
-                                 GValue     *value,
-                                 GParamSpec *pspec)
-{
-    OssStreamControl *octl;
-
-    octl = OSS_STREAM_CONTROL (object);
-
-    switch (param_id) {
-    case PROP_NAME:
-        g_value_set_string (value, octl->priv->name);
-        break;
-    case PROP_DESCRIPTION:
-        g_value_set_string (value, octl->priv->description);
-        break;
-    case PROP_FLAGS:
-        g_value_set_flags (value, octl->priv->flags);
-        break;
-    case PROP_MUTE:
-        /* Not supported */
-        g_value_set_boolean (value, FALSE);
-        break;
-    case PROP_VOLUME:
-        g_value_set_uint (value, MAX (octl->priv->volume[0], octl->priv->volume[1]));
-        break;
-    case PROP_BALANCE:
-        g_value_set_float (value, octl->priv->balance);
-        break;
-    case PROP_FADE:
-        /* Not supported */
-        g_value_set_float (value, 0.0f);
-        break;
-    case PROP_FD:
-        g_value_set_int (value, octl->priv->fd);
-        break;
-    case PROP_DEV_NUMBER:
-        g_value_set_int (value, octl->priv->dev_number);
-        break;
-    case PROP_STEREO:
-        g_value_set_boolean (value, octl->priv->stereo);
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
-
-static void
-oss_stream_control_set_property (GObject      *object,
-                                 guint         param_id,
-                                 const GValue *value,
-                                 GParamSpec   *pspec)
+oss_stream_control_init (OssStreamControl *control)
 {
-    OssStreamControl *octl;
-
-    octl = OSS_STREAM_CONTROL (object);
-
-    switch (param_id) {
-    case PROP_FD:
-        octl->priv->fd = dup (g_value_get_int (value));
-        break;
-    case PROP_DEV_NUMBER:
-        octl->priv->dev_number = g_value_get_int (value);
-        break;
-    case PROP_STEREO:
-        octl->priv->stereo = g_value_get_boolean (value);
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
-
-static void
-oss_stream_control_init (OssStreamControl *octl)
-{
-    octl->priv = G_TYPE_INSTANCE_GET_PRIVATE (octl,
-                                              OSS_TYPE_STREAM_CONTROL,
-                                              OssStreamControlPrivate);
+    control->priv = G_TYPE_INSTANCE_GET_PRIVATE (control,
+                                                 OSS_TYPE_STREAM_CONTROL,
+                                                 OssStreamControlPrivate);
 }
 
 static void
 oss_stream_control_finalize (GObject *object)
 {
-    OssStreamControl *octl;
-
-    octl = OSS_STREAM_CONTROL (object);
+    OssStreamControl *control;
 
-    g_free (octl->priv->name);
-    g_free (octl->priv->description);
+    control = OSS_STREAM_CONTROL (object);
 
-    if (octl->priv->fd != -1)
-        g_close (octl->priv->fd, NULL);
+    close (control->priv->fd);
 
     G_OBJECT_CLASS (oss_stream_control_parent_class)->finalize (object);
 }
 
 OssStreamControl *
-oss_stream_control_new (gint         fd,
-                        gint         dev_number,
-                        const gchar *name,
-                        const gchar *description,
-                        gboolean     stereo)
+oss_stream_control_new (const gchar               *name,
+                        const gchar               *label,
+                        MateMixerStreamControlRole role,
+                        gint                       fd,
+                        gint                       devnum,
+                        gboolean                   stereo)
 {
-    OssStreamControl *ctl;
-
-    ctl = g_object_new (OSS_TYPE_STREAM_CONTROL,
-                        "fd", fd,
-                        "dev-number", dev_number,
-                        "stereo", stereo,
-                        NULL);
-
-    ctl->priv->name = g_strdup (name);
-    ctl->priv->description = g_strdup (description);
+    OssStreamControl           *control;
+    MateMixerStreamControlFlags flags;
 
-    return ctl;
+    flags = MATE_MIXER_STREAM_CONTROL_HAS_VOLUME |
+            MATE_MIXER_STREAM_CONTROL_CAN_SET_VOLUME;
+    if (stereo == TRUE)
+        flags |= MATE_MIXER_STREAM_CONTROL_CAN_BALANCE;
+
+    control = g_object_new (OSS_TYPE_STREAM_CONTROL,
+                            "name", name,
+                            "label", label,
+                            "flags", flags,
+                            NULL);
+
+    control->priv->fd = fd;
+    control->priv->devnum = devnum;
+    control->priv->stereo = stereo;
+    return control;
 }
 
 gboolean
-oss_stream_control_update (OssStreamControl *octl)
+oss_stream_control_update (OssStreamControl *control)
 {
     gint v;
     gint ret;
 
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (control), FALSE);
 
-    ret = ioctl (octl->priv->fd, MIXER_READ (octl->priv->dev_number), &v);
+    ret = ioctl (control->priv->fd, MIXER_READ (control->priv->devnum), &v);
     if (ret < 0) {
         g_warning ("Failed to read volume: %s", g_strerror (errno));
         return FALSE;
     }
 
-    octl->priv->volume[0] = v & 0xFF;
+    control->priv->volume[0] = v & 0xFF;
 
-    if (octl->priv->stereo == TRUE)
-        octl->priv->volume[1] = (v >> 8) & 0xFF;
-
-    return TRUE;
-}
-
-gboolean
-oss_stream_control_set_port (OssStreamControl *octl, MateMixerPort *port)
-{
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+    if (control->priv->stereo == TRUE) {
+        gfloat balance;
+        guint  left;
+        guint  right;
 
-    // XXX provide property
+        control->priv->volume[1] = (v >> 8) & 0xFF;
 
-    if (octl->priv->port != NULL)
-        g_object_unref (octl->priv->port);
+        /* Calculate balance */
+        left  = control->priv->volume[0];
+        right = control->priv->volume[1];
+        if (left == right)
+            balance = 0.0f;
+        else if (left > right)
+            balance = -1.0f + ((gfloat) right / (gfloat) left);
+        else
+            balance = +1.0f - ((gfloat) left / (gfloat) right);
 
-    octl->priv->port = g_object_ref (port);
+        _mate_mixer_stream_control_set_balance (MATE_MIXER_STREAM_CONTROL (control),
+                                                balance);
+    }
     return TRUE;
 }
 
-gboolean
-oss_stream_control_set_role (OssStreamControl *octl, MateMixerStreamControlRole role)
+static gboolean
+oss_stream_control_set_mute (MateMixerStreamControl *mmsc, gboolean mute)
 {
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), FALSE);
 
-    octl->priv->role = role;
+    // TODO
     return TRUE;
 }
 
-static const gchar *
-oss_stream_control_get_name (MateMixerStreamControl *ctl)
+static guint
+oss_stream_control_get_num_channels (MateMixerStreamControl *mmsc)
 {
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), NULL);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), 0);
 
-    return OSS_STREAM_CONTROL (ctl)->priv->name;
+    return (OSS_STREAM_CONTROL (mmsc)->priv->stereo == TRUE) ? 2 : 1;
 }
 
-static const gchar *
-oss_stream_control_get_description (MateMixerStreamControl *ctl)
+static guint
+oss_stream_control_get_volume (MateMixerStreamControl *mmsc)
 {
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), NULL);
+    OssStreamControl *control;
 
-    return OSS_STREAM_CONTROL (ctl)->priv->description;
-}
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), 0);
 
-static guint
-oss_stream_control_get_num_channels (MateMixerStreamControl *ctl)
-{
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), 0);
+    control = OSS_STREAM_CONTROL (mmsc);
 
-    if (OSS_STREAM_CONTROL (ctl)->priv->stereo == TRUE)
-        return 2;
+    if (control->priv->stereo == TRUE)
+        return MAX (control->priv->volume[0], control->priv->volume[1]);
     else
-        return 1;
+        return control->priv->volume[0];
 }
 
 static gboolean
-oss_stream_control_set_volume (MateMixerStreamControl *ctl, guint volume)
+oss_stream_control_set_volume (MateMixerStreamControl *mmsc, guint volume)
 {
-    OssStreamControl *octl;
-    int v;
-    int ret;
-
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+    OssStreamControl *control;
+    gint              v;
 
-    octl = OSS_STREAM_CONTROL (ctl);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), FALSE);
 
-    /* Some backends may allow setting higher value than maximum, but not here */
-    if (volume > 100)
-        volume = 100;
+    control = OSS_STREAM_CONTROL (mmsc);
 
-    v = volume;
-    if (octl->priv->stereo == TRUE)
+    v = CLAMP (volume, 0, 100);
+    if (control->priv->stereo == TRUE)
         v |= (volume & 0xFF) << 8;
 
-    ret = ioctl (octl->priv->fd, MIXER_WRITE (octl->priv->dev_number), &v);
-    if (ret < 0) {
-        g_warning ("Failed to set volume: %s", g_strerror (errno));
-        return FALSE;
-    }
-    return TRUE;
+    return write_volume (control, v);
 }
 
 static guint
-oss_stream_control_get_channel_volume (MateMixerStreamControl *ctl, guint channel)
+oss_stream_control_get_channel_volume (MateMixerStreamControl *mmsc, guint channel)
 {
-    OssStreamControl *octl;
+    OssStreamControl *control;
 
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), 0);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), 0);
 
-    octl = OSS_STREAM_CONTROL (ctl);
+    control = OSS_STREAM_CONTROL (mmsc);
 
-    if (channel > 1)
-        return 0;
-
-    /* Right channel on mono stream will always have zero volume */
-    return octl->priv->volume[channel];
+    if (control->priv->stereo == TRUE) {
+        if (channel == 0 || channel == 1)
+            return control->priv->volume[channel];
+    } else {
+        if (channel == 0)
+            return control->priv->volume[0];
+    }
+    return 0;
 }
 
 static gboolean
-oss_stream_control_set_channel_volume (MateMixerStreamControl *ctl,
+oss_stream_control_set_channel_volume (MateMixerStreamControl *mmsc,
                                        guint                   channel,
                                        guint                   volume)
 {
-    OssStreamControl *octl;
-    int ret;
-    int v;
+    OssStreamControl *control;
+    gint              v;
 
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), FALSE);
 
-    if (channel > 1)
-        return FALSE;
-
-    octl = OSS_STREAM_CONTROL (ctl);
-
-    /* Some backends may allow setting higher value than maximum, but not here */
-    if (volume > 100)
-        volume = 100;
-
-    if (channel == 0)
-        v = volume;
-    else
-        v = octl->priv->volume[0];
+    control = OSS_STREAM_CONTROL (mmsc);
+    volume  = CLAMP (volume, 0, 100);
 
-    if (channel == 1) {
-        if (octl->priv->stereo == FALSE)
+    if (control->priv->stereo == TRUE) {
+        if (channel > 1)
             return FALSE;
 
-        v |= volume << 8;
-    } else
-        v |= octl->priv->volume[1] << 8;
+        /* Stereo channel volume - left channel is in the lowest 8 bits and
+         * right channel is in the higher 8 bits */
+        if (channel == 0)
+            v = volume | (control->priv->volume[1] << 8);
+        else
+            v = control->priv->volume[0] | (volume << 8);
+    } else {
+        if (channel > 0)
+            return FALSE;
 
-    ret = ioctl (octl->priv->fd, MIXER_WRITE (octl->priv->dev_number), &v);
-    if (ret < 0) {
-        g_warning ("Failed to set channel volume: %s", g_strerror (errno));
-        return FALSE;
+        /* Single channel volume - only lowest 8 bits are used */
+        v = volume;
     }
-    return TRUE;
+
+    return write_volume (control, v);
 }
 
 static MateMixerChannelPosition
-oss_stream_control_get_channel_position (MateMixerStreamControl *ctl, guint channel)
+oss_stream_control_get_channel_position (MateMixerStreamControl *mmsc, guint channel)
 {
-    OssStreamControl *octl;
+    OssStreamControl *control;
 
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), MATE_MIXER_CHANNEL_UNKNOWN);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), MATE_MIXER_CHANNEL_UNKNOWN);
 
-    octl = OSS_STREAM_CONTROL (ctl);
+    control = OSS_STREAM_CONTROL (mmsc);
 
-    if (octl->priv->stereo == TRUE) {
+    if (control->priv->stereo == TRUE) {
         if (channel == 0)
             return MATE_MIXER_CHANNEL_FRONT_LEFT;
         else if (channel == 1)
@@ -473,57 +314,79 @@ oss_stream_control_get_channel_position (MateMixerStreamControl *ctl, guint chan
 }
 
 static gboolean
-oss_stream_control_has_channel_position (MateMixerStreamControl  *ctl,
+oss_stream_control_has_channel_position (MateMixerStreamControl  *mmsc,
                                          MateMixerChannelPosition position)
 {
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), FALSE);
 
     if (position == MATE_MIXER_CHANNEL_MONO)
-        return OSS_STREAM_CONTROL (ctl)->priv->stereo == FALSE;
+        return OSS_STREAM_CONTROL (mmsc)->priv->stereo == FALSE;
 
     if (position == MATE_MIXER_CHANNEL_FRONT_LEFT ||
         position == MATE_MIXER_CHANNEL_FRONT_RIGHT)
-        return OSS_STREAM_CONTROL (ctl)->priv->stereo == TRUE;
+        return OSS_STREAM_CONTROL (mmsc)->priv->stereo == TRUE;
 
     return FALSE;
 }
 
 static gboolean
-oss_stream_control_set_balance (MateMixerStreamControl *ctl, gfloat balance)
+oss_stream_control_set_balance (MateMixerStreamControl *mmsc, gfloat balance)
 {
-    OssStreamControl *octl;
+    OssStreamControl *control;
+    guint             max;
+    gint              v;
 
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (mmsc), FALSE);
 
-    octl = OSS_STREAM_CONTROL (ctl);
+    control = OSS_STREAM_CONTROL (mmsc);
 
-    if (octl->priv->stereo == FALSE)
-        return FALSE;
+    max = MAX (control->priv->volume[0], control->priv->volume[1]);
+    if (balance <= 0) {
+        control->priv->volume[1] = (balance + 1.0f) * max;
+        control->priv->volume[0] = max;
+    } else {
+        control->priv->volume[0] = (1.0f - balance) * max;
+        control->priv->volume[1] = max;
+    }
 
-    // XXX
-    return TRUE;
+    v = control->priv->volume[0] | (control->priv->volume[1] << 8);
+
+    return write_volume (control, v);
 }
 
 static guint
-oss_stream_control_get_min_volume (MateMixerStreamControl *ctl)
+oss_stream_control_get_min_volume (MateMixerStreamControl *mmsc)
 {
     return 0;
 }
 
 static guint
-oss_stream_control_get_max_volume (MateMixerStreamControl *ctl)
+oss_stream_control_get_max_volume (MateMixerStreamControl *mmsc)
 {
     return 100;
 }
 
 static guint
-oss_stream_control_get_normal_volume (MateMixerStreamControl *ctl)
+oss_stream_control_get_normal_volume (MateMixerStreamControl *mmsc)
 {
     return 100;
 }
 
 static guint
-oss_stream_control_get_base_volume (MateMixerStreamControl *ctl)
+oss_stream_control_get_base_volume (MateMixerStreamControl *mmsc)
 {
     return 100;
 }
+
+static gboolean
+write_volume (OssStreamControl *control, gint volume)
+{
+    gint ret;
+
+    ret = ioctl (control->priv->fd, MIXER_WRITE (control->priv->devnum), &volume);
+    if (ret < 0) {
+        g_warning ("Failed to set volume: %s", g_strerror (errno));
+        return FALSE;
+    }
+    return TRUE;
+}
diff --git a/backends/oss/oss-stream-control.h b/backends/oss/oss-stream-control.h
index 420af48..c839faf 100644
--- a/backends/oss/oss-stream-control.h
+++ b/backends/oss/oss-stream-control.h
@@ -20,6 +20,7 @@
 
 #include <glib.h>
 #include <glib-object.h>
+#include <libmatemixer/matemixer.h>
 
 G_BEGIN_DECLS
 
@@ -42,7 +43,7 @@ typedef struct _OssStreamControlPrivate  OssStreamControlPrivate;
 
 struct _OssStreamControl
 {
-    GObject parent;
+    MateMixerStreamControl parent;
 
     /*< private >*/
     OssStreamControlPrivate *priv;
@@ -50,24 +51,19 @@ struct _OssStreamControl
 
 struct _OssStreamControlClass
 {
-    GObjectClass parent;
+    MateMixerStreamControlClass parent;
 };
 
-GType             oss_stream_control_get_type    (void) G_GNUC_CONST;
+GType             oss_stream_control_get_type (void) G_GNUC_CONST;
 
-OssStreamControl *oss_stream_control_new         (gint         fd,
-                                                  gint         dev_number,
-                                                  const gchar *name,
-                                                  const gchar *description,
-                                                  gboolean     stereo);
+OssStreamControl *oss_stream_control_new      (const gchar               *name,
+                                               const gchar               *label,
+                                               MateMixerStreamControlRole role,
+                                               gint                       fd,
+                                               gint                       devnum,
+                                               gboolean                   stereo);
 
-gboolean          oss_stream_control_update      (OssStreamControl *octl);
-
-gboolean          oss_stream_control_set_port    (OssStreamControl *octl,
-                                                  MateMixerPort    *port);
-
-gboolean          oss_stream_control_set_role    (OssStreamControl *octl,
-                                                  MateMixerStreamControlRole role);
+gboolean          oss_stream_control_update   (OssStreamControl          *control);
 
 G_END_DECLS
 
diff --git a/backends/oss/oss-stream.c b/backends/oss/oss-stream.c
index 69bfd06..5f0c629 100644
--- a/backends/oss/oss-stream.c
+++ b/backends/oss/oss-stream.c
@@ -15,301 +15,169 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <string.h>
 #include <glib.h>
 #include <glib-object.h>
+#include <libmatemixer/matemixer.h>
 
-#include <libmatemixer/matemixer-device.h>
-#include <libmatemixer/matemixer-enums.h>
-#include <libmatemixer/matemixer-stream.h>
-
+#include "oss-device.h"
 #include "oss-stream.h"
 #include "oss-stream-control.h"
 
 struct _OssStreamPrivate
 {
-    gchar                 *name;
-    gchar                 *description;
-    MateMixerDevice       *device;
-    MateMixerStreamFlags   flags;
-    MateMixerStreamState   state;
-    GHashTable            *ports;
-    GList                 *ports_list;
-    GHashTable            *controls;
-    GList                 *controls_list;
-    OssStreamControl      *control;
-};
-
-enum {
-    PROP_0,
-    PROP_NAME,
-    PROP_DESCRIPTION,
-    PROP_DEVICE,
-    PROP_FLAGS,
-    PROP_STATE,
-    PROP_ACTIVE_PORT,
+    GHashTable       *controls;
+    OssStreamControl *control;
 };
 
-static void mate_mixer_stream_interface_init (MateMixerStreamInterface *iface);
-
 static void oss_stream_class_init   (OssStreamClass *klass);
 
-static void oss_stream_get_property (GObject        *object,
-                                     guint           param_id,
-                                     GValue         *value,
-                                     GParamSpec     *pspec);
-
 static void oss_stream_init         (OssStream      *ostream);
 static void oss_stream_dispose      (GObject        *object);
 static void oss_stream_finalize     (GObject        *object);
 
-G_DEFINE_TYPE_WITH_CODE (OssStream, oss_stream, G_TYPE_OBJECT,
-                         G_IMPLEMENT_INTERFACE (MATE_MIXER_TYPE_STREAM,
-                                                mate_mixer_stream_interface_init))
-
-static const gchar *           oss_stream_get_name            (MateMixerStream *stream);
-static const gchar *           oss_stream_get_description     (MateMixerStream *stream);
+G_DEFINE_TYPE (OssStream, oss_stream, MATE_MIXER_TYPE_STREAM)
 
 static MateMixerStreamControl *oss_stream_get_control         (MateMixerStream *stream,
                                                                const gchar     *name);
 static MateMixerStreamControl *oss_stream_get_default_control (MateMixerStream *stream);
 
-static const GList *           oss_stream_list_controls       (MateMixerStream *stream);
-static const GList *           oss_stream_list_ports          (MateMixerStream *stream);
-
-static void
-mate_mixer_stream_interface_init (MateMixerStreamInterface *iface)
-{
-    iface->get_name            = oss_stream_get_name;
-    iface->get_description     = oss_stream_get_description;
-    iface->get_control         = oss_stream_get_control;
-    iface->get_default_control = oss_stream_get_default_control;
-    iface->list_controls       = oss_stream_list_controls;
-    iface->list_ports          = oss_stream_list_ports;
-}
+static GList *                 oss_stream_list_controls       (MateMixerStream *stream);
 
 static void
 oss_stream_class_init (OssStreamClass *klass)
 {
-    GObjectClass *object_class;
+    GObjectClass         *object_class;
+    MateMixerStreamClass *stream_class;
 
     object_class = G_OBJECT_CLASS (klass);
-    object_class->dispose      = oss_stream_dispose;
-    object_class->finalize     = oss_stream_finalize;
-    object_class->get_property = oss_stream_get_property;
+    object_class->dispose  = oss_stream_dispose;
+    object_class->finalize = oss_stream_finalize;
 
-    g_object_class_override_property (object_class, PROP_NAME, "name");
-    g_object_class_override_property (object_class, PROP_DESCRIPTION, "description");
-    g_object_class_override_property (object_class, PROP_DEVICE, "device");
-    g_object_class_override_property (object_class, PROP_FLAGS, "flags");
-    g_object_class_override_property (object_class, PROP_STATE, "state");
-    g_object_class_override_property (object_class, PROP_ACTIVE_PORT, "active-port");
+    stream_class = MATE_MIXER_STREAM_CLASS (klass);
+    stream_class->get_control         = oss_stream_get_control;
+    stream_class->get_default_control = oss_stream_get_default_control;
+    stream_class->list_controls       = oss_stream_list_controls;
 
     g_type_class_add_private (object_class, sizeof (OssStreamPrivate));
 }
 
 static void
-oss_stream_get_property (GObject    *object,
-                         guint       param_id,
-                         GValue     *value,
-                         GParamSpec *pspec)
+oss_stream_init (OssStream *stream)
 {
-    OssStream *ostream;
-
-    ostream = OSS_STREAM (object);
-
-    switch (param_id) {
-    case PROP_NAME:
-        g_value_set_string (value, ostream->priv->name);
-        break;
-    case PROP_DESCRIPTION:
-        g_value_set_string (value, ostream->priv->description);
-        break;
-    case PROP_DEVICE:
-        g_value_set_object (value, ostream->priv->device);
-        break;
-    case PROP_FLAGS:
-        g_value_set_flags (value, ostream->priv->flags);
-        break;
-    case PROP_STATE:
-        /* Not supported */
-        g_value_set_enum (value, MATE_MIXER_STREAM_STATE_UNKNOWN);
-        break;
-    case PROP_ACTIVE_PORT:
-        // XXX
-        g_value_set_object (value, NULL);
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
+    stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
+                                                OSS_TYPE_STREAM,
+                                                OssStreamPrivate);
 
-static void
-oss_stream_init (OssStream *ostream)
-{
-    ostream->priv = G_TYPE_INSTANCE_GET_PRIVATE (ostream,
-                                                 OSS_TYPE_STREAM,
-                                                 OssStreamPrivate);
-
-    ostream->priv->controls = g_hash_table_new_full (g_str_hash,
-                                                     g_str_equal,
-                                                     g_free,
-                                                     g_object_unref);
-
-    ostream->priv->ports = g_hash_table_new_full (g_str_hash,
-                                                  g_str_equal,
-                                                  g_free,
-                                                  g_object_unref);
+    stream->priv->controls = g_hash_table_new_full (g_str_hash,
+                                                    g_str_equal,
+                                                    g_free,
+                                                    g_object_unref);
 }
 
 static void
 oss_stream_dispose (GObject *object)
 {
-    OssStream *ostream;
+    OssStream *stream;
 
-    ostream = OSS_STREAM (object);
+    stream = OSS_STREAM (object);
 
-    g_hash_table_remove_all (ostream->priv->controls);
-    g_hash_table_remove_all (ostream->priv->ports);
+    g_clear_object (&stream->priv->control);
+    g_hash_table_remove_all (stream->priv->controls);
 
-    G_OBJECT_CLASS (oss_stream_parent_class)->finalize (object);
+    G_OBJECT_CLASS (oss_stream_parent_class)->dispose (object);
 }
 
 static void
 oss_stream_finalize (GObject *object)
 {
-    OssStream *ostream;
-
-    ostream = OSS_STREAM (object);
+    OssStream *stream;
 
-    g_free (ostream->priv->name);
-    g_free (ostream->priv->description);
+    stream = OSS_STREAM (object);
 
-    g_hash_table_destroy (ostream->priv->controls);
-    g_hash_table_destroy (ostream->priv->ports);
+    g_hash_table_destroy (stream->priv->controls);
 
     G_OBJECT_CLASS (oss_stream_parent_class)->finalize (object);
 }
 
 OssStream *
 oss_stream_new (const gchar         *name,
-                const gchar         *description,
+                MateMixerDevice     *device,
                 MateMixerStreamFlags flags)
 {
     OssStream *stream;
 
-    stream = g_object_new (OSS_TYPE_STREAM, NULL);
-
-    stream->priv->name = g_strdup (name);
-    stream->priv->description = g_strdup (description);
-    stream->priv->flags = flags;
-
+    stream = g_object_new (OSS_TYPE_STREAM,
+                           "name", name,
+                           "device", device,
+                           "flags", flags,
+                           NULL);
     return stream;
 }
 
 gboolean
-oss_stream_add_control (OssStream *ostream, OssStreamControl *octl)
+oss_stream_add_control (OssStream *stream, OssStreamControl *control)
 {
     const gchar *name;
 
-    g_return_val_if_fail (OSS_IS_STREAM (ostream), FALSE);
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM (stream), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (control), FALSE);
 
-    name = mate_mixer_stream_control_get_name (MATE_MIXER_STREAM_CONTROL (octl));
+    name = mate_mixer_stream_control_get_name (MATE_MIXER_STREAM_CONTROL (control));
 
-    g_hash_table_insert (ostream->priv->controls,
+    g_hash_table_insert (stream->priv->controls,
                          g_strdup (name),
-                         octl);
+                         control);
     return TRUE;
 }
 
 gboolean
-oss_stream_set_default_control (OssStream *ostream, OssStreamControl *octl)
+oss_stream_set_default_control (OssStream *stream, OssStreamControl *control)
 {
-    g_return_val_if_fail (OSS_IS_STREAM (ostream), FALSE);
-    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM (stream), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (control), FALSE);
 
     /* This function is only used internally so avoid validating that the control
      * belongs to this stream */
-    if (ostream->priv->control != NULL)
-        g_object_unref (ostream->priv->control);
-
-    ostream->priv->control = g_object_ref (octl);
-    return TRUE;
-}
+    if (stream->priv->control != NULL)
+        g_object_unref (stream->priv->control);
 
-gboolean
-oss_stream_add_port (OssStream *ostream, MateMixerPort *port)
-{
-    g_return_val_if_fail (OSS_IS_STREAM (ostream), FALSE);
-    g_return_val_if_fail (MATE_MIXER_IS_PORT (port), FALSE);
+    if G_LIKELY (control != NULL)
+        stream->priv->control = g_object_ref (control);
+    else
+        stream->priv->control = NULL;
 
-    g_hash_table_insert (ostream->priv->ports,
-                         g_strdup (mate_mixer_port_get_name (port)),
-                         port);
     return TRUE;
 }
 
-static const gchar *
-oss_stream_get_name (MateMixerStream *stream)
-{
-    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
-
-    return OSS_STREAM (stream)->priv->name;
-}
-
-static const gchar *
-oss_stream_get_description (MateMixerStream *stream)
-{
-    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
-
-    return OSS_STREAM (stream)->priv->description;
-}
-
 static MateMixerStreamControl *
-oss_stream_get_control (MateMixerStream *stream, const gchar *name)
+oss_stream_get_control (MateMixerStream *mms, const gchar *name)
 {
-    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
+    g_return_val_if_fail (OSS_IS_STREAM (mms), NULL);
     g_return_val_if_fail (name != NULL, NULL);
 
-    return g_hash_table_lookup (OSS_STREAM (stream)->priv->controls, name);
+    return g_hash_table_lookup (OSS_STREAM (mms)->priv->controls, name);
 }
 
 static MateMixerStreamControl *
-oss_stream_get_default_control (MateMixerStream *stream)
-{
-    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
-
-    return MATE_MIXER_STREAM_CONTROL (OSS_STREAM (stream)->priv->control);
-}
-
-static const GList *
-oss_stream_list_controls (MateMixerStream *stream)
+oss_stream_get_default_control (MateMixerStream *mms)
 {
-    OssStream *ostream;
-
-    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
-
-    ostream = OSS_STREAM (stream);
+    g_return_val_if_fail (OSS_IS_STREAM (mms), NULL);
 
-    if (ostream->priv->controls_list == NULL)
-        ostream->priv->controls_list = g_hash_table_get_values (ostream->priv->controls);
-
-    return ostream->priv->controls_list;
+    return MATE_MIXER_STREAM_CONTROL (OSS_STREAM (mms)->priv->control);
 }
 
-static const GList *
-oss_stream_list_ports (MateMixerStream *stream)
+static GList *
+oss_stream_list_controls (MateMixerStream *mms)
 {
-    OssStream *ostream;
-
-    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
+    GList *list;
 
-    ostream = OSS_STREAM (stream);
+    g_return_val_if_fail (OSS_IS_STREAM (mms), NULL);
 
-    if (ostream->priv->ports_list == NULL)
-        ostream->priv->ports_list = g_hash_table_get_values (ostream->priv->ports);
+    /* Convert the hash table to a linked list, this list is expected to be
+     * cached in the main library */
+    list = g_hash_table_get_values (OSS_STREAM (mms)->priv->controls);
+    if (list != NULL)
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
 
-    return ostream->priv->ports_list;
+    return list;
 }
diff --git a/backends/oss/oss-stream.h b/backends/oss/oss-stream.h
index d6c2fb2..0470eb7 100644
--- a/backends/oss/oss-stream.h
+++ b/backends/oss/oss-stream.h
@@ -20,7 +20,9 @@
 
 #include <glib.h>
 #include <glib-object.h>
+#include <libmatemixer/matemixer.h>
 
+#include "oss-device.h"
 #include "oss-stream-control.h"
 
 G_BEGIN_DECLS
@@ -44,7 +46,7 @@ typedef struct _OssStreamPrivate  OssStreamPrivate;
 
 struct _OssStream
 {
-    GObject parent;
+    MateMixerStream parent;
 
     /*< private >*/
     OssStreamPrivate *priv;
@@ -52,23 +54,20 @@ struct _OssStream
 
 struct _OssStreamClass
 {
-    GObjectClass parent;
+    MateMixerStreamClass parent;
 };
 
-GType             oss_stream_get_type            (void) G_GNUC_CONST;
+GType      oss_stream_get_type            (void) G_GNUC_CONST;
 
-OssStream *       oss_stream_new                 (const gchar         *name,
-                                                  const gchar         *description,
-                                                  MateMixerStreamFlags flags);
+OssStream *oss_stream_new                 (const gchar         *name,
+                                           MateMixerDevice     *device,
+                                           MateMixerStreamFlags flags);
 
-gboolean          oss_stream_add_control         (OssStream           *stream,
-                                                  OssStreamControl    *ctl);
+gboolean   oss_stream_add_control         (OssStream           *stream,
+                                           OssStreamControl    *control);
 
-gboolean          oss_stream_set_default_control (OssStream           *stream,
-                                                  OssStreamControl    *ctl);
-
-gboolean          oss_stream_add_port            (OssStream           *ostream,
-                                                  MateMixerPort       *port);
+gboolean   oss_stream_set_default_control (OssStream           *stream,
+                                           OssStreamControl    *control);
 
 G_END_DECLS
 
diff --git a/backends/oss4/Makefile.am b/backends/oss4/Makefile.am
deleted file mode 100644
index cca8723..0000000
--- a/backends/oss4/Makefile.am
+++ /dev/null
@@ -1,29 +0,0 @@
-backenddir = $(libdir)/libmatemixer
-
-backend_LTLIBRARIES = libmatemixer-oss4.la
-
-AM_CPPFLAGS =                                                   \
-        -I$(top_srcdir)                                         \
-        -DG_LOG_DOMAIN=\"libmatemixer-oss4\"
-
-libmatemixer_oss4_la_CFLAGS =                                   \
-        $(GLIB_CFLAGS)                                          \
-        $(OSS4_CFLAGS)
-
-libmatemixer_oss4_la_SOURCES =                                  \
-        oss4-common.h                                           \
-        oss4-backend.c                                          \
-        oss4-backend.h                                          \
-        oss4-device.c                                           \
-        oss4-device.h
-
-libmatemixer_oss4_la_LIBADD =                                   \
-        $(GLIB_LIBS)
-
-libmatemixer_oss4_la_LDFLAGS =                                  \
-        -avoid-version                                          \
-        -no-undefined                                           \
-        -export-dynamic                                         \
-        -module
-
--include $(top_srcdir)/git.mk
diff --git a/backends/oss4/oss4-backend.c b/backends/oss4/oss4-backend.c
deleted file mode 100644
index bd79fdf..0000000
--- a/backends/oss4/oss4-backend.c
+++ /dev/null
@@ -1,487 +0,0 @@
-/*
- * Copyright (C) 2014 Michal Ratajsky <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the licence, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <glib.h>
-#include <glib-object.h>
-#include <glib/gstdio.h>
-#include <glib/gprintf.h>
-#include <glib/gi18n.h>
-#include <gio/gio.h>
-
-#include <libmatemixer/matemixer-backend.h>
-#include <libmatemixer/matemixer-backend-module.h>
-#include <libmatemixer/matemixer-enums.h>
-#include <libmatemixer/matemixer-stream.h>
-
-#include "oss4-backend.h"
-#include "oss4-common.h"
-#include "oss4-device.h"
-
-#define BACKEND_NAME      "OSS4"
-#define BACKEND_PRIORITY  8
-
-#define PATH_SNDSTAT      "/dev/sndstat"
-
-struct _Oss4BackendPrivate
-{
-    gint fd;
-    gchar           *sndstat;
-    GHashTable      *devices;
-    GHashTable      *streams;
-    MateMixerStream *default_input;
-    MateMixerStream *default_output;
-    MateMixerState   state;
-};
-
-enum {
-    PROP_0,
-    PROP_STATE,
-    PROP_DEFAULT_INPUT,
-    PROP_DEFAULT_OUTPUT
-};
-
-static void mate_mixer_backend_interface_init (MateMixerBackendInterface *iface);
-
-static void oss4_backend_class_init     (Oss4BackendClass *klass);
-static void oss4_backend_class_finalize (Oss4BackendClass *klass);
-
-static void oss4_backend_get_property   (GObject         *object,
-                                         guint            param_id,
-                                         GValue          *value,
-                                         GParamSpec      *pspec);
-
-static void oss4_backend_init           (Oss4Backend     *oss);
-static void oss4_backend_dispose        (GObject         *object);
-static void oss4_backend_finalize       (GObject         *object);
-
-G_DEFINE_DYNAMIC_TYPE_EXTENDED (Oss4Backend, oss4_backend,
-                                G_TYPE_OBJECT, 0,
-                                G_IMPLEMENT_INTERFACE_DYNAMIC (MATE_MIXER_TYPE_BACKEND,
-                                                               mate_mixer_backend_interface_init))
-
-static gboolean oss4_backend_open         (MateMixerBackend  *backend);
-static void     oss4_backend_close        (MateMixerBackend  *backend);
-static GList *  oss4_backend_list_devices (MateMixerBackend  *backend);
-static GList *  oss4_backend_list_streams (MateMixerBackend  *backend);
-
-static void     change_state                    (Oss4Backend       *oss,
-                                                 MateMixerState     state);
-
-static gboolean read_device (Oss4Backend *oss, gint index);
-
-static gchar *  read_device_sndstat_description (Oss4Backend *oss,
-                                                 const gchar *prefix);
-
-static void     add_device      (Oss4Backend *oss, Oss4Device *device);
-static void     remove_device   (Oss4Backend *oss, Oss4Device *device);
-
-static MateMixerBackendInfo info;
-
-void
-backend_module_init (GTypeModule *module)
-{
-    oss4_backend_register_type (module);
-
-    info.name         = BACKEND_NAME;
-    info.priority     = BACKEND_PRIORITY;
-    info.g_type       = OSS4_TYPE_BACKEND;
-    info.backend_type = MATE_MIXER_BACKEND_OSS4;
-}
-
-const MateMixerBackendInfo *backend_module_get_info (void)
-{
-    return &info;
-}
-
-static void
-mate_mixer_backend_interface_init (MateMixerBackendInterface *iface)
-{
-    iface->open         = oss4_backend_open;
-    iface->close        = oss4_backend_close;
-    iface->list_devices = oss4_backend_list_devices;
-    iface->list_streams = oss4_backend_list_streams;
-}
-
-static void
-oss4_backend_class_init (Oss4BackendClass *klass)
-{
-    GObjectClass *object_class;
-
-    object_class = G_OBJECT_CLASS (klass);
-    object_class->dispose      = oss4_backend_dispose;
-    object_class->finalize     = oss4_backend_finalize;
-    object_class->get_property = oss4_backend_get_property;
-
-    g_object_class_override_property (object_class, PROP_STATE, "state");
-    g_object_class_override_property (object_class, PROP_DEFAULT_INPUT, "default-input");
-    g_object_class_override_property (object_class, PROP_DEFAULT_OUTPUT, "default-output");
-
-    g_type_class_add_private (object_class, sizeof (Oss4BackendPrivate));
-}
-
-/* Called in the code generated by G_DEFINE_DYNAMIC_TYPE_EXTENDED() */
-static void
-oss4_backend_class_finalize (Oss4BackendClass *klass)
-{
-}
-
-static void
-oss4_backend_get_property (GObject    *object,
-                           guint       param_id,
-                           GValue     *value,
-                           GParamSpec *pspec)
-{
-    Oss4Backend *oss;
-
-    oss = OSS4_BACKEND (object);
-
-    switch (param_id) {
-    case PROP_STATE:
-        g_value_set_enum (value, oss->priv->state);
-        break;
-    case PROP_DEFAULT_INPUT:
-        g_value_set_object (value, oss->priv->default_input);
-        break;
-    case PROP_DEFAULT_OUTPUT:
-        g_value_set_object (value, oss->priv->default_output);
-        break;
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
-
-static void
-oss4_backend_init (Oss4Backend *oss)
-{
-    oss->priv = G_TYPE_INSTANCE_GET_PRIVATE (oss,
-                                             OSS4_TYPE_BACKEND,
-                                             Oss4BackendPrivate);
-
-    oss->priv->devices = g_hash_table_new_full (g_direct_hash,
-                                                g_direct_equal,
-                                                NULL,
-                                                g_object_unref);
-
-    oss->priv->streams = g_hash_table_new_full (g_str_hash,
-                                                g_str_equal,
-                                                g_free,
-                                                g_object_unref);
-}
-
-static void
-oss4_backend_dispose (GObject *object)
-{
-    oss4_backend_close (MATE_MIXER_BACKEND (object));
-}
-
-static void
-oss4_backend_finalize (GObject *object)
-{
-    Oss4Backend *oss;
-
-    oss = OSS4_BACKEND (object);
-
-    g_hash_table_destroy (oss->priv->devices);
-    g_hash_table_destroy (oss->priv->streams);
-}
-
-static gboolean
-oss4_backend_open (MateMixerBackend *backend)
-{
-    Oss4Backend       *oss;
-    gint               fd;
-    gint               i;
-    gint               ret;
-    struct oss_sysinfo info;
-
-    g_return_val_if_fail (OSS4_IS_BACKEND (backend), FALSE);
-
-    oss = OSS4_BACKEND (backend);
-
-    fd = g_open ("/dev/mixer", O_RDONLY, 0);
-    if (fd == -1)
-        fd = g_open ("/dev/mixer0", O_RDONLY, 0);
-    if (fd == -1) {
-        change_state (oss, MATE_MIXER_STATE_FAILED);
-        return FALSE;
-    }
-
-    /* Query the number of mixer devices */
-    ret = ioctl (fd, OSS_SYSINFO, &info);
-    if (ret == -1) {
-        close (fd);
-        change_state (oss, MATE_MIXER_STATE_FAILED);
-        return FALSE;
-    }
-
-    g_debug ("The sound system is %s version %s",
-             info.product,
-             info.version);
-
-#if !defined(__linux__)
-    /* At least on systems based on FreeBSD we will need to read devices names
-     * from the sndstat file, but avoid even trying that on systems where this
-     * is not needed and the file is not present */
-    oss->priv->sndstat = PATH_SNDSTAT;
-#endif
-
-    oss->priv->fd = fd;
-
-    for (i = 0; i < info.nummixers; i++)
-        read_device (oss, i);
-
-    change_state (oss, MATE_MIXER_STATE_READY);
-    return TRUE;
-}
-
-void
-oss4_backend_close (MateMixerBackend *backend)
-{
-    Oss4Backend *oss;
-
-    g_return_if_fail (OSS4_IS_BACKEND (backend));
-
-    oss = OSS4_BACKEND (backend);
-
-    g_clear_object (&oss->priv->default_input);
-    g_clear_object (&oss->priv->default_output);
-
-    g_hash_table_remove_all (oss->priv->streams);
-    g_hash_table_remove_all (oss->priv->devices);
-}
-
-static GList *
-oss4_backend_list_devices (MateMixerBackend *backend)
-{
-    GList *list;
-
-    g_return_val_if_fail (OSS4_IS_BACKEND (backend), NULL);
-
-    /* Convert the hash table to a sorted linked list, this list is expected
-     * to be cached in the main library */
-    list = g_hash_table_get_values (OSS4_BACKEND (backend)->priv->devices);
-    if (list != NULL) {
-        g_list_foreach (list, (GFunc) g_object_ref, NULL);
-
-        return list;
-    }
-    return NULL;
-}
-
-static GList *
-oss4_backend_list_streams (MateMixerBackend *backend)
-{
-    GList *list;
-
-    g_return_val_if_fail (OSS4_IS_BACKEND (backend), NULL);
-
-    /* Convert the hash table to a sorted linked list, this list is expected
-     * to be cached in the main library */
-    list = g_hash_table_get_values (OSS4_BACKEND (backend)->priv->streams);
-    if (list != NULL) {
-        g_list_foreach (list, (GFunc) g_object_ref, NULL);
-
-        return list;
-    }
-    return NULL;
-}
-
-static void
-change_state (Oss4Backend *oss, MateMixerState state)
-{
-    if (oss->priv->state == state)
-        return;
-
-    oss->priv->state = state;
-
-    g_object_notify (G_OBJECT (oss), "state");
-}
-
-static gboolean
-read_device (Oss4Backend *oss, gint index)
-{
-    Oss4Device          *device;
-    gboolean             ret;
-    gchar               *description = NULL;
-    struct oss_mixerinfo info;
-
-    /* We assume that the name and capabilities of a device do not change */
-    device = g_hash_table_lookup (oss->priv->devices, GINT_TO_POINTER (index));
-    if (G_UNLIKELY (device != NULL)) {
-        g_debug ("Attempt to re-read already know device with index %d", index);
-        return TRUE;
-    }
-
-    info.dev = index;
-    ret = ioctl (oss->priv->fd, SNDCTL_MIXERINFO, &info);
-    if (ret == -1) {
-        g_debug ("Failed to read mixer info: %s", g_strerror (errno));
-        return FALSE;
-    }
-
-    if (info.enabled == 0)
-        return TRUE;
-
-    /* Use the id as the device name and try to figure out the name of the
-     * sound card from the sndstat file if it is available, otherwise use
-     * the name from the mixer info */
-    if (oss->priv->sndstat != NULL &&
-        g_str_has_prefix (info.name, "pcm") == TRUE)
-        description = read_device_sndstat_description (oss, info.name);
-
-    if (description == NULL)
-        description = g_strdup (info.name);
-
-    device = oss4_device_new (info.id, description, oss->priv->fd, index);
-
-    ret = oss4_device_read (device);
-    if (ret == TRUE)
-        add_device (oss, device);
-
-    g_object_unref (device);
-    g_free (description);
-
-    return ret;
-}
-
-static gchar *
-read_device_sndstat_description (Oss4Backend *oss, const gchar *prefix)
-{
-    FILE  *fp;
-    gchar  line[256];
-    gchar *description = NULL;
-
-    g_debug ("reading prefix %s", prefix);
-
-    fp = fopen (oss->priv->sndstat, "r");
-    if (fp == NULL) {
-        g_warning ("Failed to read %s: %s", oss->priv->sndstat, g_strerror (errno));
-        return FALSE;
-    }
-
-    while (fgets (line, sizeof (line), fp) != NULL) {
-        gchar *p;
-
-        if (g_str_has_prefix (line, prefix) == FALSE)
-            continue;
-
-        /* Example line:
-         * pcm0: <ATI R6xx (HDMI)> (play) default */
-        p = strchr (line, '<');
-        if (p != NULL && *p && *(++p)) {
-            gchar *end = strchr (p, '>');
-
-            if (end != NULL)
-                description = g_strndup (p, end - p);
-        }
-
-        // XXX we can also read "default" at the end of the line
-        // XXX http://ashish.is.lostca.se/2011/05/23/default-sound-device-in-freebsd/
-        if (g_str_has_suffix (line, "default") ||
-            g_str_has_suffix (line, "default)"))
-            ;
-
-        if (description != NULL)
-            break;
-    }
-
-    fclose (fp);
-    return description;
-}
-
-static void
-add_device (Oss4Backend *oss, Oss4Device *device)
-{
-    MateMixerStream *stream;
-
-    /* Add device, file path is used as the key rather than the name, because
-     * the name is not known until an OssDevice instance is created */
-    g_hash_table_insert (oss->priv->devices,
-                         GINT_TO_POINTER (oss4_device_get_index (device)),
-                         g_object_ref (device));
-
-    g_signal_emit_by_name (G_OBJECT (oss),
-                           "device-added",
-                           mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)));
-
-    /* Add streams if they exist */
-    stream = oss4_device_get_input_stream (device);
-    if (stream != NULL) {
-        g_hash_table_insert (oss->priv->streams,
-                             g_strdup (mate_mixer_stream_get_name (stream)),
-                             g_object_ref (stream));
-
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-added",
-                               mate_mixer_stream_get_name (stream));
-    }
-
-    stream = oss4_device_get_output_stream (device);
-    if (stream != NULL) {
-        g_hash_table_insert (oss->priv->streams,
-                             g_strdup (mate_mixer_stream_get_name (stream)),
-                             g_object_ref (stream));
-
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-added",
-                               mate_mixer_stream_get_name (stream));
-    }
-}
-
-static void
-remove_device (Oss4Backend *oss, Oss4Device *device)
-{
-    MateMixerStream *stream;
-
-    /* Remove the device streams first as they are a part of the device */
-    stream = oss4_device_get_input_stream (device);
-    if (stream != NULL) {
-        const gchar *name = mate_mixer_stream_get_name (stream);
-
-        g_hash_table_remove (oss->priv->streams, name);
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-removed",
-                               name);
-    }
-
-    stream = oss4_device_get_output_stream (device);
-    if (stream != NULL) {
-        const gchar *name = mate_mixer_stream_get_name (stream);
-
-        g_hash_table_remove (oss->priv->streams, stream);
-        g_signal_emit_by_name (G_OBJECT (oss),
-                               "stream-removed",
-                               name);
-    }
-
-    /* Remove the device */
-    g_object_ref (device);
-
-    g_hash_table_remove (oss->priv->devices,
-                         GINT_TO_POINTER (oss4_device_get_index (device)));
-
-    g_signal_emit_by_name (G_OBJECT (oss),
-                           "device-removed",
-                           mate_mixer_device_get_name (MATE_MIXER_DEVICE (device)));
-
-    g_object_unref (device);
-}
diff --git a/backends/oss4/oss4-backend.h b/backends/oss4/oss4-backend.h
deleted file mode 100644
index bc89e72..0000000
--- a/backends/oss4/oss4-backend.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright (C) 2014 Michal Ratajsky <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the licence, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef OSS4_BACKEND_H
-#define OSS4_BACKEND_H
-
-#include <glib.h>
-#include <glib-object.h>
-
-#include <libmatemixer/matemixer-backend-module.h>
-
-#define OSS4_TYPE_BACKEND                       \
-        (oss4_backend_get_type ())
-#define OSS4_BACKEND(o)                         \
-        (G_TYPE_CHECK_INSTANCE_CAST ((o), OSS4_TYPE_BACKEND, Oss4Backend))
-#define OSS4_IS_BACKEND(o)                      \
-        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSS4_TYPE_BACKEND))
-#define OSS4_BACKEND_CLASS(k)                   \
-        (G_TYPE_CHECK_CLASS_CAST ((k), OSS4_TYPE_BACKEND, Oss4BackendClass))
-#define OSS4_IS_BACKEND_CLASS(k)                \
-        (G_TYPE_CHECK_CLASS_TYPE ((k), OSS4_TYPE_BACKEND))
-#define OSS4_BACKEND_GET_CLASS(o)               \
-        (G_TYPE_INSTANCE_GET_CLASS ((o), OSS4_TYPE_BACKEND, Oss4BackendClass))
-
-typedef struct _Oss4Backend         Oss4Backend;
-typedef struct _Oss4BackendClass    Oss4BackendClass;
-typedef struct _Oss4BackendPrivate  Oss4BackendPrivate;
-
-struct _Oss4Backend
-{
-    GObject parent;
-
-    /*< private >*/
-    Oss4BackendPrivate *priv;
-};
-
-struct _Oss4BackendClass
-{
-    GObjectClass parent_class;
-};
-
-GType                       oss4_backend_get_type   (void) G_GNUC_CONST;
-
-/* Support function for dynamic loading of the backend module */
-void                        backend_module_init     (GTypeModule *module);
-const MateMixerBackendInfo *backend_module_get_info (void);
-
-#endif /* OSS4_BACKEND_H */
diff --git a/backends/oss4/oss4-device.c b/backends/oss4/oss4-device.c
deleted file mode 100644
index b68648b..0000000
--- a/backends/oss4/oss4-device.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
- * Copyright (C) 2014 Michal Ratajsky <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the licence, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#include <errno.h>
-#include <unistd.h>
-#include <glib.h>
-#include <glib/gi18n.h>
-#include <glib/gstdio.h>
-#include <glib-object.h>
-
-#include <libmatemixer/matemixer-device.h>
-#include <libmatemixer/matemixer-enums.h>
-#include <libmatemixer/matemixer-port.h>
-#include <libmatemixer/matemixer-port-private.h>
-#include <libmatemixer/matemixer-stream.h>
-#include <libmatemixer/matemixer-stream-control.h>
-
-#include "oss4-common.h"
-#include "oss4-device.h"
-
-#define OSS4_DEVICE_ICON "audio-card"
-
-struct _Oss4DevicePrivate
-{
-    gint             fd;
-    gint             index;
-    gchar           *name;
-    gchar           *description;
-    gchar           *icon;
-    MateMixerStream *input;
-    MateMixerStream *output;
-};
-
-enum {
-    PROP_0,
-    PROP_NAME,
-    PROP_DESCRIPTION,
-    PROP_ICON,
-    PROP_ACTIVE_PROFILE,
-    PROP_FD,
-    PROP_INDEX
-};
-
-static void mate_mixer_device_interface_init (MateMixerDeviceInterface *iface);
-
-static void oss4_device_class_init   (Oss4DeviceClass *klass);
-
-static void oss4_device_get_property (GObject        *object,
-                                      guint           param_id,
-                                      GValue         *value,
-                                      GParamSpec     *pspec);
-static void oss4_device_set_property (GObject        *object,
-                                      guint           param_id,
-                                      const GValue   *value,
-                                      GParamSpec     *pspec);
-
-static void oss4_device_init         (Oss4Device     *device);
-static void oss4_device_finalize     (GObject        *object);
-
-G_DEFINE_TYPE_WITH_CODE (Oss4Device, oss4_device, G_TYPE_OBJECT,
-                         G_IMPLEMENT_INTERFACE (MATE_MIXER_TYPE_DEVICE,
-                                                mate_mixer_device_interface_init))
-
-static const gchar *oss4_device_get_name        (MateMixerDevice *device);
-static const gchar *oss4_device_get_description (MateMixerDevice *device);
-static const gchar *oss4_device_get_icon        (MateMixerDevice *device);
-
-static gboolean     read_mixer_devices          (Oss4Device      *device);
-
-static void
-mate_mixer_device_interface_init (MateMixerDeviceInterface *iface)
-{
-    iface->get_name        = oss4_device_get_name;
-    iface->get_description = oss4_device_get_description;
-    iface->get_icon        = oss4_device_get_icon;
-}
-
-static void
-oss4_device_class_init (Oss4DeviceClass *klass)
-{
-    GObjectClass *object_class;
-
-    object_class = G_OBJECT_CLASS (klass);
-    object_class->finalize     = oss4_device_finalize;
-    object_class->get_property = oss4_device_get_property;
-    object_class->set_property = oss4_device_set_property;
-
-    g_object_class_install_property (object_class,
-                                     PROP_FD,
-                                     g_param_spec_int ("fd",
-                                                       "File descriptor",
-                                                       "File descriptor of the device",
-                                                       G_MININT,
-                                                       G_MAXINT,
-                                                       -1,
-                                                       G_PARAM_CONSTRUCT_ONLY |
-                                                       G_PARAM_READWRITE |
-                                                       G_PARAM_STATIC_STRINGS));
-
-    g_object_class_install_property (object_class,
-                                     PROP_INDEX,
-                                     g_param_spec_int ("index",
-                                                       "Index",
-                                                       "Index of the device",
-                                                       G_MININT,
-                                                       G_MAXINT,
-                                                       0,
-                                                       G_PARAM_CONSTRUCT_ONLY |
-                                                       G_PARAM_READWRITE |
-                                                       G_PARAM_STATIC_STRINGS));
-
-    g_object_class_override_property (object_class, PROP_NAME, "name");
-    g_object_class_override_property (object_class, PROP_DESCRIPTION, "description");
-    g_object_class_override_property (object_class, PROP_ICON, "icon");
-    g_object_class_override_property (object_class, PROP_ACTIVE_PROFILE, "active-profile");
-
-    g_type_class_add_private (object_class, sizeof (Oss4DevicePrivate));
-}
-
-static void
-oss4_device_get_property (GObject    *object,
-                         guint       param_id,
-                         GValue     *value,
-                         GParamSpec *pspec)
-{
-    Oss4Device *device;
-
-    device = OSS4_DEVICE (object);
-
-    switch (param_id) {
-    case PROP_NAME:
-        g_value_set_string (value, device->priv->name);
-        break;
-    case PROP_DESCRIPTION:
-        g_value_set_string (value, device->priv->description);
-        break;
-    case PROP_ICON:
-        g_value_set_string (value, OSS4_DEVICE_ICON);
-        break;
-    case PROP_ACTIVE_PROFILE:
-        /* Not supported */
-        g_value_set_object (value, NULL);
-        break;
-    case PROP_FD:
-        g_value_set_int (value, device->priv->fd);
-        break;
-    case PROP_INDEX:
-        g_value_set_int (value, device->priv->index);
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
-
-static void
-oss4_device_set_property (GObject      *object,
-                         guint         param_id,
-                         const GValue *value,
-                         GParamSpec   *pspec)
-{
-    Oss4Device *device;
-
-    device = OSS4_DEVICE (object);
-
-    switch (param_id) {
-    case PROP_NAME:
-        /* Construct-only string */
-        device->priv->name = g_strdup (g_value_get_string (value));
-        break;
-    case PROP_DESCRIPTION:
-        /* Construct-only string */
-        device->priv->description = g_strdup (g_value_get_string (value));
-        break;
-    case PROP_ICON:
-        /* Construct-only string */
-        device->priv->icon = g_strdup (g_value_get_string (value));
-        break;
-    case PROP_FD:
-        device->priv->fd = dup (g_value_get_int (value));
-        break;
-    case PROP_INDEX:
-        device->priv->index = g_value_get_int (value);
-        break;
-    default:
-        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
-        break;
-    }
-}
-
-static void
-oss4_device_init (Oss4Device *device)
-{
-    device->priv = G_TYPE_INSTANCE_GET_PRIVATE (device,
-                                                OSS4_TYPE_DEVICE,
-                                                Oss4DevicePrivate);
-}
-
-static void
-oss4_device_finalize (GObject *object)
-{
-    Oss4Device *device;
-
-    device = OSS4_DEVICE (object);
-
-    g_free (device->priv->name);
-    g_free (device->priv->description);
-
-    if (device->priv->fd != -1)
-        g_close (device->priv->fd, NULL);
-
-    G_OBJECT_CLASS (oss4_device_parent_class)->finalize (object);
-}
-
-Oss4Device *
-oss4_device_new (const gchar *name,
-                 const gchar *description,
-                 gint         fd,
-                 gint         index)
-{
-    Oss4Device *device;
-
-    device = g_object_new (OSS4_TYPE_DEVICE,
-                           "name", name,
-                           "description", description,
-                           "fd", fd,
-                           "index", index,
-                           NULL);
-
-    return device;
-}
-
-gboolean
-oss4_device_read (Oss4Device *odevice)
-{
-    gint exts;
-    gint ret;
-    gint i;
-
-    ret = ioctl (odevice->priv->fd, SNDCTL_MIX_NREXT, &exts);
-    if (ret == -1)
-        return FALSE;
-
-    for (i = 0; i < exts; i++) {
-        oss_mixext ext;
-
-        ext.dev  = odevice->priv->index;
-        ext.ctrl = i;
-        ret = ioctl (odevice->priv->fd, SNDCTL_MIX_EXTINFO, &ext);
-        if (ret == -1)
-            continue;
-
-        g_debug ("Mixer control %d type %d\n"
-                 " min %d max %d\n"
-                 " id %s\n"
-                 " extname %s",
-                 i,ext.type, ext.minvalue, ext.maxvalue, ext.id, ext.extname);
-    }
-
-    return TRUE;
-}
-
-gint
-oss4_device_get_index (Oss4Device *odevice)
-{
-    g_return_val_if_fail (OSS4_IS_DEVICE (odevice), FALSE);
-
-    return odevice->priv->index;
-}
-
-MateMixerStream *
-oss4_device_get_input_stream (Oss4Device *odevice)
-{
-    g_return_val_if_fail (OSS4_IS_DEVICE (odevice), FALSE);
-
-    return odevice->priv->input;
-}
-
-MateMixerStream *
-oss4_device_get_output_stream (Oss4Device *odevice)
-{
-    g_return_val_if_fail (OSS4_IS_DEVICE (odevice), FALSE);
-
-    return odevice->priv->output;
-}
-
-static gboolean
-read_mixer_devices (Oss4Device *device)
-{
-}
-
-static const gchar *
-oss4_device_get_name (MateMixerDevice *device)
-{
-    g_return_val_if_fail (OSS4_IS_DEVICE (device), NULL);
-
-    return OSS4_DEVICE (device)->priv->name;
-}
-
-static const gchar *
-oss4_device_get_description (MateMixerDevice *device)
-{
-    g_return_val_if_fail (OSS4_IS_DEVICE (device), NULL);
-
-    return OSS4_DEVICE (device)->priv->description;
-}
-
-static const gchar *
-oss4_device_get_icon (MateMixerDevice *device)
-{
-    g_return_val_if_fail (OSS4_IS_DEVICE (device), NULL);
-
-    return OSS4_DEVICE_ICON;
-}
diff --git a/backends/oss4/oss4-device.h b/backends/oss4/oss4-device.h
deleted file mode 100644
index 3ec72e7..0000000
--- a/backends/oss4/oss4-device.h
+++ /dev/null
@@ -1,72 +0,0 @@
-/*
- * Copyright (C) 2014 Michal Ratajsky <[email protected]>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the licence, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef OSS4_DEVICE_H
-#define OSS4_DEVICE_H
-
-#include <glib.h>
-#include <glib-object.h>
-
-G_BEGIN_DECLS
-
-#define OSS4_TYPE_DEVICE                        \
-        (oss4_device_get_type ())
-#define OSS4_DEVICE(o)                          \
-        (G_TYPE_CHECK_INSTANCE_CAST ((o), OSS4_TYPE_DEVICE, Oss4Device))
-#define OSS4_IS_DEVICE(o)                       \
-        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSS4_TYPE_DEVICE))
-#define OSS4_DEVICE_CLASS(k)                    \
-        (G_TYPE_CHECK_CLASS_CAST ((k), OSS4_TYPE_DEVICE, Oss4DeviceClass))
-#define OSS4_IS_DEVICE_CLASS(k)                 \
-        (G_TYPE_CHECK_CLASS_TYPE ((k), OSS4_TYPE_DEVICE))
-#define OSS4_DEVICE_GET_CLASS(o)                \
-        (G_TYPE_INSTANCE_GET_CLASS ((o), OSS4_TYPE_DEVICE, Oss4DeviceClass))
-
-typedef struct _Oss4Device         Oss4Device;
-typedef struct _Oss4DeviceClass    Oss4DeviceClass;
-typedef struct _Oss4DevicePrivate  Oss4DevicePrivate;
-
-struct _Oss4Device
-{
-    GObject parent;
-
-    /*< private >*/
-    Oss4DevicePrivate *priv;
-};
-
-struct _Oss4DeviceClass
-{
-    GObjectClass parent;
-};
-
-GType            oss4_device_get_type          (void) G_GNUC_CONST;
-
-Oss4Device *     oss4_device_new (const gchar *name,
-                                  const gchar *description,
-                                  gint         fd,
-                                  gint         index);
-
-gboolean         oss4_device_read              (Oss4Device   *device);
-
-gint             oss4_device_get_index         (Oss4Device *odevice);
-
-MateMixerStream *oss4_device_get_input_stream  (Oss4Device   *odevice);
-MateMixerStream *oss4_device_get_output_stream (Oss4Device   *odevice);
-
-G_END_DECLS
-
-#endif /* OSS_DEVICE_H */