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authorMichal Ratajsky <[email protected]>2014-07-27 13:12:53 +0200
committerMichal Ratajsky <[email protected]>2014-07-27 13:12:53 +0200
commit8436ec1641eee8868128755f6d1475230cea25e6 (patch)
tree1883410069b08ad7068ee1fc52df3fadb60d7bd3 /backends/oss4/oss4-backend.c
parente369a047e3a43bd149fbce0af475bdef853aaf1a (diff)
downloadlibmatemixer-8436ec1641eee8868128755f6d1475230cea25e6.tar.bz2
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Beginning of OSS4 support
Diffstat (limited to 'backends/oss4/oss4-backend.c')
-rw-r--r--backends/oss4/oss4-backend.c487
1 files changed, 487 insertions, 0 deletions
diff --git a/backends/oss4/oss4-backend.c b/backends/oss4/oss4-backend.c
new file mode 100644
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--- /dev/null
+++ b/backends/oss4/oss4-backend.c
@@ -0,0 +1,487 @@
+/*
+ * 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);
+}
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