Support OSS

10 files changed, 2128 insertions, 19 deletions

diff --git a/backends/oss/Makefile.am b/backends/oss/Makefile.am
index 3f0b8ea..44caeb8 100644
--- a/backends/oss/Makefile.am
+++ b/backends/oss/Makefile.am
@@ -11,11 +11,19 @@ libmatemixer_oss_la_CFLAGS =                                    \
         $(OSS_CFLAGS)
 
 libmatemixer_oss_la_SOURCES =                                   \
+        oss-common.h                                            \
         oss-backend.c                                           \
-        oss-backend.h
+        oss-backend.h                                           \
+        oss-device.c                                            \
+        oss-device.h                                            \
+        oss-stream.c                                            \
+        oss-stream.h                                            \
+        oss-stream-control.c                                    \
+        oss-stream-control.h
 
 libmatemixer_oss_la_LIBADD =                                    \
-        $(GLIB_LIBS)
+        $(GLIB_LIBS)                                            \
+        $(OSS_LIBS)
 
 libmatemixer_oss_la_LDFLAGS =                                   \
         -avoid-version                                          \
diff --git a/backends/oss/oss-backend.c b/backends/oss/oss-backend.c
index 22d3547..6e058f8 100644
--- a/backends/oss/oss-backend.c
+++ b/backends/oss/oss-backend.c
@@ -15,43 +15,95 @@
  * 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 "oss-backend.h"
+#include "oss-common.h"
+#include "oss-device.h"
 
 #define BACKEND_NAME      "OSS"
-#define BACKEND_PRIORITY  90
+#define BACKEND_PRIORITY  9
+
+#define PATH_SNDSTAT      "/dev/sndstat"
+
+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,
-    N_PROPERTIES
+    PROP_DEFAULT_OUTPUT
 };
 
 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))
 
-static gboolean       backend_open      (MateMixerBackend *backend);
-static MateMixerState backend_get_state (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 void     change_state                    (OssBackend        *oss,
+                                                 MateMixerState     state);
+
+static void     on_dev_monitor_changed          (GFileMonitor      *monitor,
+                                                 GFile             *file,
+                                                 GFile             *other_file,
+                                                 GFileMonitorEvent  event_type,
+                                                 OssBackend        *oss);
+
+static gboolean read_device                     (OssBackend        *oss,
+                                                 const gchar        *path);
+
+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 MateMixerBackendInfo info;
 
@@ -66,8 +118,7 @@ backend_module_init (GTypeModule *module)
     info.backend_type = MATE_MIXER_BACKEND_OSS;
 }
 
-const MateMixerBackendInfo *
-backend_module_get_info (void)
+const MateMixerBackendInfo *backend_module_get_info (void)
 {
     return &info;
 }
@@ -75,8 +126,10 @@ backend_module_get_info (void)
 static void
 mate_mixer_backend_interface_init (MateMixerBackendInterface *iface)
 {
-    iface->open      = backend_open;
-    iface->get_state = backend_get_state;
+    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
@@ -85,11 +138,15 @@ oss_backend_class_init (OssBackendClass *klass)
     GObjectClass *object_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;
 
     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 (OssBackendPrivate));
 }
 
 /* Called in the code generated by G_DEFINE_DYNAMIC_TYPE_EXTENDED() */
@@ -104,13 +161,20 @@ oss_backend_get_property (GObject    *object,
                           GValue     *value,
                           GParamSpec *pspec)
 {
+    OssBackend *oss;
+
+    oss = OSS_BACKEND (object);
+
     switch (param_id) {
     case PROP_STATE:
-        g_value_set_enum (value, MATE_MIXER_STATE_READY);
+        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, NULL);
+        g_value_set_object (value, oss->priv->default_output);
+        break;
         break;
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
@@ -121,16 +185,420 @@ oss_backend_get_property (GObject    *object,
 static void
 oss_backend_init (OssBackend *oss)
 {
+    oss->priv = G_TYPE_INSTANCE_GET_PRIVATE (oss,
+                                             OSS_TYPE_BACKEND,
+                                             OssBackendPrivate);
+
+    oss->priv->devices = g_hash_table_new_full (g_str_hash,
+                                                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));
+}
+
+static void
+oss_backend_finalize (GObject *object)
+{
+    OssBackend *oss;
+
+    oss = OSS_BACKEND (object);
+
+    g_hash_table_destroy (oss->priv->devices);
+    g_hash_table_destroy (oss->priv->streams);
 }
 
 static gboolean
-backend_open (MateMixerBackend *backend)
+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);
     return TRUE;
 }
 
-static MateMixerState
-backend_get_state (MateMixerBackend *backend)
+void
+oss_backend_close (MateMixerBackend *backend)
+{
+    OssBackend *oss;
+
+    g_return_if_fail (OSS_IS_BACKEND (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_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);
+}
+
+static GList *
+oss_backend_list_devices (MateMixerBackend *backend)
+{
+    GList *list;
+
+    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->devices);
+    if (list != NULL) {
+        g_list_foreach (list, (GFunc) g_object_ref, NULL);
+
+        return list;
+    }
+    return NULL;
+}
+
+static GList *
+oss_backend_list_streams (MateMixerBackend *backend)
+{
+    GList *list;
+
+    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);
+
+        return list;
+    }
+    return NULL;
+}
+
+static void
+change_state (OssBackend *oss, MateMixerState state)
+{
+    if (oss->priv->state == state)
+        return;
+
+    oss->priv->state = state;
+
+    g_object_notify (G_OBJECT (oss), "state");
+}
+
+static void
+on_dev_monitor_changed (GFileMonitor     *monitor,
+                        GFile            *file,
+                        GFile            *other_file,
+                        GFileMonitorEvent event_type,
+                        OssBackend       *oss)
+{
+    gchar *path;
+
+    if (event_type != G_FILE_MONITOR_EVENT_CREATED &&
+        event_type != G_FILE_MONITOR_EVENT_DELETED)
+        return;
+
+    path = g_file_get_path (file);
+
+    /* 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);
+}
+
+static gboolean
+read_device (OssBackend *oss, const gchar *path)
+{
+    OssDevice   *device;
+    gint         fd;
+    gboolean     ret;
+    const gchar *description;
+
+    /* 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;
+    }
+
+    fd = g_open (path, O_RDWR, 0);
+    if (fd == -1) {
+        if (errno != ENOENT && errno != ENXIO)
+            g_debug ("%s: %s", path, g_strerror (errno));
+        return FALSE;
+    }
+
+    device = oss_device_new (path, fd);
+
+    description = read_device_description (oss, path, fd);
+    if (description != NULL)
+        oss_device_set_description (device, description);
+    else
+        oss_device_set_description (device, _("Unknown device"));
+
+    /* Close the descriptor as the device should dup it if it intends
+     * to keep it */
+    g_close (fd, NULL);
+
+    ret = oss_device_read (device);
+    if (ret == TRUE)
+        add_device (oss, device);
+
+    g_object_unref (device);
+    return ret;
+}
+
+static gchar *
+read_device_description (OssBackend *oss, const gchar *path, gint fd)
+{
+    struct mixer_info info;
+
+    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);
+    }
+
+    /* 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);
+
+                g_clear_object (&oss->priv->sndstat);
+            }
+            g_error_free (error);
+        } else
+            return read_device_sndstat_description (path, input);
+    }
+
+    return NULL;
+}
+
+static gchar *
+read_device_sndstat_description (const gchar *path, GFileInputStream *input)
 {
-    return MATE_MIXER_STATE_READY;
+    gchar            *line;
+    gchar            *prefix;
+    gchar            *description = NULL;
+    GDataInputStream *stream;
+
+    if (G_UNLIKELY (g_str_has_prefix (path, "/dev/mixer")) == FALSE) {
+        g_warn_if_reached ();
+        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;
+        }
+
+        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;
+    }
+
+    g_object_unref (stream);
+    g_free (prefix);
+
+    return description;
+}
+
+static void
+add_device (OssBackend *oss, OssDevice *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,
+                         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));
+    }
+
+    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),
+                               "stream-added",
+                               mate_mixer_stream_get_name (stream));
+    }
+}
+
+static void
+remove_device (OssBackend *oss, OssDevice *device)
+{
+    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);
+
+        g_hash_table_remove (oss->priv->streams, name);
+        g_signal_emit_by_name (G_OBJECT (oss),
+                               "stream-removed",
+                               name);
+    }
+
+    stream = oss_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);
+    }
+
+    path = oss_device_get_path (device);
+
+    /* Remove the device */
+    g_object_ref (device);
+
+    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)));
+
+    g_object_unref (device);
 }
diff --git a/backends/oss/oss-backend.h b/backends/oss/oss-backend.h
index 02567ed..b766799 100644
--- a/backends/oss/oss-backend.h
+++ b/backends/oss/oss-backend.h
@@ -36,12 +36,16 @@
 #define OSS_BACKEND_GET_CLASS(o)                \
         (G_TYPE_INSTANCE_GET_CLASS ((o), OSS_TYPE_BACKEND, OssBackendClass))
 
-typedef struct _OssBackend       OssBackend;
-typedef struct _OssBackendClass  OssBackendClass;
+typedef struct _OssBackend         OssBackend;
+typedef struct _OssBackendClass    OssBackendClass;
+typedef struct _OssBackendPrivate  OssBackendPrivate;
 
 struct _OssBackend
 {
     GObject parent;
+
+    /*< private >*/
+    OssBackendPrivate *priv;
 };
 
 struct _OssBackendClass
diff --git a/backends/oss/oss-common.h b/backends/oss/oss-common.h
new file mode 100644
index 0000000..7251b86
--- /dev/null
+++ b/backends/oss/oss-common.h
@@ -0,0 +1,38 @@
+/*
+ * 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 OSS_COMMON_H
+#define OSS_COMMON_H
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#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 OSS header file present"
+#endif
+
+#endif /* OSS_COMMON_H */
diff --git a/backends/oss/oss-device.c b/backends/oss/oss-device.c
new file mode 100644
index 0000000..f33ff57
--- /dev/null
+++ b/backends/oss/oss-device.c
@@ -0,0 +1,525 @@
+/*
+ * 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 "oss-common.h"
+#include "oss-device.h"
+#include "oss-stream.h"
+#include "oss-stream-control.h"
+
+#define OSS_DEVICE_ICON "audio-card"
+
+typedef struct
+{
+    gchar                     *name;
+    gchar                     *description;
+    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 },
+    /* 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 },
+    /* 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 }
+};
+
+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
+};
+
+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_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))
+
+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 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 void
+oss_device_class_init (OssDeviceClass *klass)
+{
+    GObjectClass *object_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");
+
+    g_type_class_add_private (object_class, sizeof (OssDevicePrivate));
+}
+
+static void
+oss_device_get_property (GObject    *object,
+                         guint       param_id,
+                         GValue     *value,
+                         GParamSpec *pspec)
+{
+    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;
+    }
+}
+
+static void
+oss_device_set_property (GObject      *object,
+                         guint         param_id,
+                         const GValue *value,
+                         GParamSpec   *pspec)
+{
+    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;
+    }
+}
+
+static void
+oss_device_init (OssDevice *device)
+{
+    device->priv = G_TYPE_INSTANCE_GET_PRIVATE (device,
+                                                OSS_TYPE_DEVICE,
+                                                OssDevicePrivate);
+}
+
+static void
+oss_device_finalize (GObject *object)
+{
+    OssDevice *device;
+
+    device = OSS_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 (oss_device_parent_class)->finalize (object);
+}
+
+OssDevice *
+oss_device_new (const gchar *path, gint fd)
+{
+    OssDevice *device;
+    gchar     *basename;
+
+    g_return_val_if_fail (path != NULL, NULL);
+
+    device = g_object_new (OSS_TYPE_DEVICE,
+                           "path", path,
+                           "fd", fd,
+                           NULL);
+
+    basename = g_path_get_basename (path);
+
+    device->priv->name = g_strdup_printf ("oss-%s", basename);
+    g_free (basename);
+
+    return device;
+}
+
+gboolean
+oss_device_read (OssDevice *device)
+{
+    gchar                  *name;
+    gchar                  *basename;
+    MateMixerStreamControl *ctl;
+
+    g_return_val_if_fail (OSS_IS_DEVICE (device), FALSE);
+
+    // XXX avoid calling this function repeatedly
+
+    g_debug ("Querying 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);
+    }
+
+    if (ctl != 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);
+    }
+
+    if (ctl != NULL)
+        g_debug ("Default output stream control is %s",
+                 mate_mixer_stream_control_get_description (ctl));
+
+    return TRUE;
+}
+
+const gchar *
+oss_device_get_path (OssDevice *odevice)
+{
+    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+
+    return odevice->priv->path;
+}
+
+MateMixerStream *
+oss_device_get_input_stream (OssDevice *odevice)
+{
+    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+
+    return odevice->priv->input;
+}
+
+MateMixerStream *
+oss_device_get_output_stream (OssDevice *odevice)
+{
+    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+
+    return odevice->priv->output;
+}
+
+gboolean
+oss_device_set_description (OssDevice *odevice, const gchar *description)
+{
+    g_return_val_if_fail (OSS_IS_DEVICE (odevice), FALSE);
+
+    if (g_strcmp0 (odevice->priv->description, description) != 0) {
+        g_free (odevice->priv->description);
+
+        odevice->priv->description = g_strdup (description);
+
+        g_object_notify (G_OBJECT (odevice), "description");
+        return TRUE;
+    }
+    return FALSE;
+}
+
+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;
+
+    for (i = 0; i < MIN (G_N_ELEMENTS (oss_devices), SOUND_MIXER_NRDEVICES); i++) {
+        gboolean       stereo;
+        gboolean       input = FALSE;
+        MateMixerPort *port = NULL;
+
+        /* Skip unavailable controls */
+        if ((devmask & (1 << i)) == 0)
+            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].flags == MATE_MIXER_STREAM_INPUT) {
+            if ((recmask & (1 << i)) == 0) {
+                g_debug ("Skipping non-input device %s", oss_devices[i].name);
+                continue;
+            }
+            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);
+
+        if (input == TRUE) {
+            oss_stream_add_control (OSS_STREAM (device->priv->input), ctl);
+
+            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 (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);
+            }
+
+            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)));
+
+        oss_stream_control_update (ctl);
+    }
+    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)
+{
+    g_return_val_if_fail (OSS_IS_DEVICE (device), NULL);
+
+    return OSS_DEVICE_ICON;
+}
diff --git a/backends/oss/oss-device.h b/backends/oss/oss-device.h
new file mode 100644
index 0000000..fe40eb2
--- /dev/null
+++ b/backends/oss/oss-device.h
@@ -0,0 +1,73 @@
+/*
+ * 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 OSS_DEVICE_H
+#define OSS_DEVICE_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define OSS_TYPE_DEVICE                         \
+        (oss_device_get_type ())
+#define OSS_DEVICE(o)                           \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), OSS_TYPE_DEVICE, OssDevice))
+#define OSS_IS_DEVICE(o)                        \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSS_TYPE_DEVICE))
+#define OSS_DEVICE_CLASS(k)                     \
+        (G_TYPE_CHECK_CLASS_CAST ((k), OSS_TYPE_DEVICE, OssDeviceClass))
+#define OSS_IS_DEVICE_CLASS(k)                  \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), OSS_TYPE_DEVICE))
+#define OSS_DEVICE_GET_CLASS(o)                 \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), OSS_TYPE_DEVICE, OssDeviceClass))
+
+typedef struct _OssDevice         OssDevice;
+typedef struct _OssDeviceClass    OssDeviceClass;
+typedef struct _OssDevicePrivate  OssDevicePrivate;
+
+struct _OssDevice
+{
+    GObject parent;
+
+    /*< private >*/
+    OssDevicePrivate *priv;
+};
+
+struct _OssDeviceClass
+{
+    GObjectClass parent;
+};
+
+GType            oss_device_get_type          (void) G_GNUC_CONST;
+
+OssDevice *      oss_device_new               (const gchar *path,
+                                               gint         fd);
+
+gboolean         oss_device_read              (OssDevice   *device);
+
+const gchar *    oss_device_get_path          (OssDevice   *odevice);
+
+MateMixerStream *oss_device_get_input_stream  (OssDevice   *odevice);
+MateMixerStream *oss_device_get_output_stream (OssDevice   *odevice);
+
+gboolean         oss_device_set_description   (OssDevice   *odevice,
+                                               const gchar *description);
+
+G_END_DECLS
+
+#endif /* OSS_DEVICE_H */
diff --git a/backends/oss/oss-stream-control.c b/backends/oss/oss-stream-control.c
new file mode 100644
index 0000000..0b1db26
--- /dev/null
+++ b/backends/oss/oss-stream-control.c
@@ -0,0 +1,529 @@
+/*
+ * 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 <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 "oss-common.h"
+#include "oss-stream-control.h"
+
+struct _OssStreamControlPrivate
+{
+    gint                        fd;
+    gint                        dev_number;
+    gchar                      *name;
+    gchar                      *description;
+    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_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      *octl);
+static void oss_stream_control_finalize     (GObject               *object);
+
+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 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  *ctl);
+
+static gboolean                 oss_stream_control_set_volume           (MateMixerStreamControl  *ctl,
+                                                                         guint                    volume);
+
+static guint                    oss_stream_control_get_channel_volume   (MateMixerStreamControl  *ctl,
+                                                                         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,
+                                                                         guint                    channel);
+static gboolean                 oss_stream_control_has_channel_position (MateMixerStreamControl  *ctl,
+                                                                         MateMixerChannelPosition position);
+
+static gboolean                 oss_stream_control_set_balance          (MateMixerStreamControl  *ctl,
+                                                                         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 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 void
+oss_stream_control_class_init (OssStreamControlClass *klass)
+{
+    GObjectClass *object_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");
+
+    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)
+{
+    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);
+}
+
+static void
+oss_stream_control_finalize (GObject *object)
+{
+    OssStreamControl *octl;
+
+    octl = OSS_STREAM_CONTROL (object);
+
+    g_free (octl->priv->name);
+    g_free (octl->priv->description);
+
+    if (octl->priv->fd != -1)
+        g_close (octl->priv->fd, NULL);
+
+    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)
+{
+    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);
+
+    return ctl;
+}
+
+gboolean
+oss_stream_control_update (OssStreamControl *octl)
+{
+    gint v;
+    gint ret;
+
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+
+    ret = ioctl (octl->priv->fd, MIXER_READ (octl->priv->dev_number), &v);
+    if (ret < 0) {
+        g_warning ("Failed to read volume: %s", g_strerror (errno));
+        return FALSE;
+    }
+
+    octl->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);
+
+    // XXX provide property
+
+    if (octl->priv->port != NULL)
+        g_object_unref (octl->priv->port);
+
+    octl->priv->port = g_object_ref (port);
+    return TRUE;
+}
+
+gboolean
+oss_stream_control_set_role (OssStreamControl *octl, MateMixerStreamControlRole role)
+{
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+
+    octl->priv->role = role;
+    return TRUE;
+}
+
+static const gchar *
+oss_stream_control_get_name (MateMixerStreamControl *ctl)
+{
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), NULL);
+
+    return OSS_STREAM_CONTROL (ctl)->priv->name;
+}
+
+static const gchar *
+oss_stream_control_get_description (MateMixerStreamControl *ctl)
+{
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), NULL);
+
+    return OSS_STREAM_CONTROL (ctl)->priv->description;
+}
+
+static guint
+oss_stream_control_get_num_channels (MateMixerStreamControl *ctl)
+{
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), 0);
+
+    if (OSS_STREAM_CONTROL (ctl)->priv->stereo == TRUE)
+        return 2;
+    else
+        return 1;
+}
+
+static gboolean
+oss_stream_control_set_volume (MateMixerStreamControl *ctl, guint volume)
+{
+    OssStreamControl *octl;
+    int v;
+    int ret;
+
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+
+    octl = OSS_STREAM_CONTROL (ctl);
+
+    /* Some backends may allow setting higher value than maximum, but not here */
+    if (volume > 100)
+        volume = 100;
+
+    v = volume;
+    if (octl->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;
+}
+
+static guint
+oss_stream_control_get_channel_volume (MateMixerStreamControl *ctl, guint channel)
+{
+    OssStreamControl *octl;
+
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), 0);
+
+    octl = OSS_STREAM_CONTROL (ctl);
+
+    if (channel > 1)
+        return 0;
+
+    /* Right channel on mono stream will always have zero volume */
+    return octl->priv->volume[channel];
+}
+
+static gboolean
+oss_stream_control_set_channel_volume (MateMixerStreamControl *ctl,
+                                       guint                   channel,
+                                       guint                   volume)
+{
+    OssStreamControl *octl;
+    int ret;
+    int v;
+
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), 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];
+
+    if (channel == 1) {
+        if (octl->priv->stereo == FALSE)
+            return FALSE;
+
+        v |= volume << 8;
+    } else
+        v |= octl->priv->volume[1] << 8;
+
+    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;
+    }
+    return TRUE;
+}
+
+static MateMixerChannelPosition
+oss_stream_control_get_channel_position (MateMixerStreamControl *ctl, guint channel)
+{
+    OssStreamControl *octl;
+
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), MATE_MIXER_CHANNEL_UNKNOWN);
+
+    octl = OSS_STREAM_CONTROL (ctl);
+
+    if (octl->priv->stereo == TRUE) {
+        if (channel == 0)
+            return MATE_MIXER_CHANNEL_FRONT_LEFT;
+        else if (channel == 1)
+            return MATE_MIXER_CHANNEL_FRONT_RIGHT;
+    } else {
+        if (channel == 0)
+            return MATE_MIXER_CHANNEL_MONO;
+    }
+    return MATE_MIXER_CHANNEL_UNKNOWN;
+}
+
+static gboolean
+oss_stream_control_has_channel_position (MateMixerStreamControl  *ctl,
+                                         MateMixerChannelPosition position)
+{
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+
+    if (position == MATE_MIXER_CHANNEL_MONO)
+        return OSS_STREAM_CONTROL (ctl)->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 FALSE;
+}
+
+static gboolean
+oss_stream_control_set_balance (MateMixerStreamControl *ctl, gfloat balance)
+{
+    OssStreamControl *octl;
+
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (ctl), FALSE);
+
+    octl = OSS_STREAM_CONTROL (ctl);
+
+    if (octl->priv->stereo == FALSE)
+        return FALSE;
+
+    // XXX
+    return TRUE;
+}
+
+static guint
+oss_stream_control_get_min_volume (MateMixerStreamControl *ctl)
+{
+    return 0;
+}
+
+static guint
+oss_stream_control_get_max_volume (MateMixerStreamControl *ctl)
+{
+    return 100;
+}
+
+static guint
+oss_stream_control_get_normal_volume (MateMixerStreamControl *ctl)
+{
+    return 100;
+}
+
+static guint
+oss_stream_control_get_base_volume (MateMixerStreamControl *ctl)
+{
+    return 100;
+}
diff --git a/backends/oss/oss-stream-control.h b/backends/oss/oss-stream-control.h
new file mode 100644
index 0000000..420af48
--- /dev/null
+++ b/backends/oss/oss-stream-control.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 OSS_STREAM_CONTROL_H
+#define OSS_STREAM_CONTROL_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define OSS_TYPE_STREAM_CONTROL                 \
+        (oss_stream_control_get_type ())
+#define OSS_STREAM_CONTROL(o)                   \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), OSS_TYPE_STREAM_CONTROL, OssStreamControl))
+#define OSS_IS_STREAM_CONTROL(o)                \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSS_TYPE_STREAM_CONTROL))
+#define OSS_STREAM_CONTROL_CLASS(k)             \
+        (G_TYPE_CHECK_CLASS_CAST ((k), OSS_TYPE_STREAM_CONTROL, OssStreamControlClass))
+#define OSS_IS_STREAM_CONTROL_CLASS(k)          \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), OSS_TYPE_STREAM_CONTROL))
+#define OSS_STREAM_CONTROL_GET_CLASS(o)         \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), OSS_TYPE_STREAM_CONTROL, OssStreamControlClass))
+
+typedef struct _OssStreamControl         OssStreamControl;
+typedef struct _OssStreamControlClass    OssStreamControlClass;
+typedef struct _OssStreamControlPrivate  OssStreamControlPrivate;
+
+struct _OssStreamControl
+{
+    GObject parent;
+
+    /*< private >*/
+    OssStreamControlPrivate *priv;
+};
+
+struct _OssStreamControlClass
+{
+    GObjectClass parent;
+};
+
+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);
+
+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);
+
+G_END_DECLS
+
+#endif /* OSS_STREAM_CONTROL_H */
diff --git a/backends/oss/oss-stream.c b/backends/oss/oss-stream.c
new file mode 100644
index 0000000..69bfd06
--- /dev/null
+++ b/backends/oss/oss-stream.c
@@ -0,0 +1,315 @@
+/*
+ * 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 <string.h>
+#include <glib.h>
+#include <glib-object.h>
+
+#include <libmatemixer/matemixer-device.h>
+#include <libmatemixer/matemixer-enums.h>
+#include <libmatemixer/matemixer-stream.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,
+};
+
+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);
+
+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 void
+oss_stream_class_init (OssStreamClass *klass)
+{
+    GObjectClass *object_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;
+
+    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");
+
+    g_type_class_add_private (object_class, sizeof (OssStreamPrivate));
+}
+
+static void
+oss_stream_get_property (GObject    *object,
+                         guint       param_id,
+                         GValue     *value,
+                         GParamSpec *pspec)
+{
+    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;
+    }
+}
+
+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);
+}
+
+static void
+oss_stream_dispose (GObject *object)
+{
+    OssStream *ostream;
+
+    ostream = OSS_STREAM (object);
+
+    g_hash_table_remove_all (ostream->priv->controls);
+    g_hash_table_remove_all (ostream->priv->ports);
+
+    G_OBJECT_CLASS (oss_stream_parent_class)->finalize (object);
+}
+
+static void
+oss_stream_finalize (GObject *object)
+{
+    OssStream *ostream;
+
+    ostream = OSS_STREAM (object);
+
+    g_free (ostream->priv->name);
+    g_free (ostream->priv->description);
+
+    g_hash_table_destroy (ostream->priv->controls);
+    g_hash_table_destroy (ostream->priv->ports);
+
+    G_OBJECT_CLASS (oss_stream_parent_class)->finalize (object);
+}
+
+OssStream *
+oss_stream_new (const gchar         *name,
+                const gchar         *description,
+                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;
+
+    return stream;
+}
+
+gboolean
+oss_stream_add_control (OssStream *ostream, OssStreamControl *octl)
+{
+    const gchar *name;
+
+    g_return_val_if_fail (OSS_IS_STREAM (ostream), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), FALSE);
+
+    name = mate_mixer_stream_control_get_name (MATE_MIXER_STREAM_CONTROL (octl));
+
+    g_hash_table_insert (ostream->priv->controls,
+                         g_strdup (name),
+                         octl);
+    return TRUE;
+}
+
+gboolean
+oss_stream_set_default_control (OssStream *ostream, OssStreamControl *octl)
+{
+    g_return_val_if_fail (OSS_IS_STREAM (ostream), FALSE);
+    g_return_val_if_fail (OSS_IS_STREAM_CONTROL (octl), 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;
+}
+
+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);
+
+    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)
+{
+    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
+    g_return_val_if_fail (name != NULL, NULL);
+
+    return g_hash_table_lookup (OSS_STREAM (stream)->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)
+{
+    OssStream *ostream;
+
+    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
+
+    ostream = OSS_STREAM (stream);
+
+    if (ostream->priv->controls_list == NULL)
+        ostream->priv->controls_list = g_hash_table_get_values (ostream->priv->controls);
+
+    return ostream->priv->controls_list;
+}
+
+static const GList *
+oss_stream_list_ports (MateMixerStream *stream)
+{
+    OssStream *ostream;
+
+    g_return_val_if_fail (OSS_IS_STREAM (stream), NULL);
+
+    ostream = OSS_STREAM (stream);
+
+    if (ostream->priv->ports_list == NULL)
+        ostream->priv->ports_list = g_hash_table_get_values (ostream->priv->ports);
+
+    return ostream->priv->ports_list;
+}
diff --git a/backends/oss/oss-stream.h b/backends/oss/oss-stream.h
new file mode 100644
index 0000000..d6c2fb2
--- /dev/null
+++ b/backends/oss/oss-stream.h
@@ -0,0 +1,75 @@
+/*
+ * 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 OSS_STREAM_H
+#define OSS_STREAM_H
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include "oss-stream-control.h"
+
+G_BEGIN_DECLS
+
+#define OSS_TYPE_STREAM                         \
+        (oss_stream_get_type ())
+#define OSS_STREAM(o)                           \
+        (G_TYPE_CHECK_INSTANCE_CAST ((o), OSS_TYPE_STREAM, OssStream))
+#define OSS_IS_STREAM(o)                        \
+        (G_TYPE_CHECK_INSTANCE_TYPE ((o), OSS_TYPE_STREAM))
+#define OSS_STREAM_CLASS(k)                     \
+        (G_TYPE_CHECK_CLASS_CAST ((k), OSS_TYPE_STREAM, OssStreamClass))
+#define OSS_IS_STREAM_CLASS(k)                  \
+        (G_TYPE_CHECK_CLASS_TYPE ((k), OSS_TYPE_STREAM))
+#define OSS_STREAM_GET_CLASS(o)                 \
+        (G_TYPE_INSTANCE_GET_CLASS ((o), OSS_TYPE_STREAM, OssStreamClass))
+
+typedef struct _OssStream         OssStream;
+typedef struct _OssStreamClass    OssStreamClass;
+typedef struct _OssStreamPrivate  OssStreamPrivate;
+
+struct _OssStream
+{
+    GObject parent;
+
+    /*< private >*/
+    OssStreamPrivate *priv;
+};
+
+struct _OssStreamClass
+{
+    GObjectClass parent;
+};
+
+GType             oss_stream_get_type            (void) G_GNUC_CONST;
+
+OssStream *       oss_stream_new                 (const gchar         *name,
+                                                  const gchar         *description,
+                                                  MateMixerStreamFlags flags);
+
+gboolean          oss_stream_add_control         (OssStream           *stream,
+                                                  OssStreamControl    *ctl);
+
+gboolean          oss_stream_set_default_control (OssStream           *stream,
+                                                  OssStreamControl    *ctl);
+
+gboolean          oss_stream_add_port            (OssStream           *ostream,
+                                                  MateMixerPort       *port);
+
+G_END_DECLS
+
+#endif /* OSS_STREAM_H */