Add API to get and set the volume

From: Sjoerd Simons <sjoerd.simons@collabora.co.uk>

svn path=/trunk/; revision=2484

2 files changed, 99 insertions, 5 deletions

diff --git a/libempathy-gtk/empathy-audio-sink.c b/libempathy-gtk/empathy-audio-sink.c
index 8db046a85..d304a2676 100644
--- a/libempathy-gtk/empathy-audio-sink.c
+++ b/libempathy-gtk/empathy-audio-sink.c
@@ -22,8 +22,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <gst/farsight/fs-element-added-notifier.h>
+
 #include "empathy-audio-sink.h"
 
+
 G_DEFINE_TYPE(EmpathyGstAudioSink, empathy_audio_sink, GST_TYPE_BIN)
 
 /* signal enum */
@@ -36,6 +39,10 @@ enum
 static guint signals[LAST_SIGNAL] = {0};
 #endif
 
+enum {
+  PROP_VOLUME = 1,
+};
+
 /* private structure */
 typedef struct _EmpathyGstAudioSinkPrivate EmpathyGstAudioSinkPrivate;
 
@@ -43,6 +50,8 @@ struct _EmpathyGstAudioSinkPrivate
 {
   gboolean dispose_has_run;
   GstElement *sink;
+  GstElement *volume;
+  FsElementAddedNotifier *notifier;
 };
 
 #define EMPATHY_GST_AUDIO_SINK_GET_PRIVATE(o) \
@@ -50,19 +59,37 @@ struct _EmpathyGstAudioSinkPrivate
   EmpathyGstAudioSinkPrivate))
 
 static void
+empathy_audio_sink_element_added_cb (FsElementAddedNotifier *notifier,
+  GstBin *bin, GstElement *element, EmpathyGstAudioSink *self)
+{
+  EmpathyGstAudioSinkPrivate *priv = EMPATHY_GST_AUDIO_SINK_GET_PRIVATE (self);
+
+  if (g_object_class_find_property (G_OBJECT_CLASS (element), "volume"))
+    {
+      priv->volume = element;
+    }
+}
+
+static void
 empathy_audio_sink_init (EmpathyGstAudioSink *obj)
 {
   EmpathyGstAudioSinkPrivate *priv = EMPATHY_GST_AUDIO_SINK_GET_PRIVATE (obj);
   GstElement *resample;
   GstPad *ghost, *sink;
 
-  /* allocate any data required by the object here */
-  resample = gst_element_factory_make ("audioresample", NULL);
+  priv->notifier = fs_element_added_notifier_new ();
+  g_signal_connect (priv->notifier, "element-added",
+    G_CALLBACK (empathy_audio_sink_element_added_cb), obj);
 
+  resample = gst_element_factory_make ("audioresample", NULL);
+  priv->volume = gst_element_factory_make ("volume", NULL);
   priv->sink = gst_element_factory_make ("gconfaudiosink", NULL);
 
-  gst_bin_add_many (GST_BIN (obj), resample, priv->sink, NULL);
-  gst_element_link_many (resample, priv->sink, NULL);
+  fs_element_added_notifier_add (priv->notifier, GST_BIN (priv->sink));
+
+
+  gst_bin_add_many (GST_BIN (obj), resample, priv->volume, priv->sink, NULL);
+  gst_element_link_many (resample, priv->volume, priv->sink, NULL);
 
   sink = gst_element_get_static_pad (resample, "sink");
 
@@ -76,16 +103,57 @@ static void empathy_audio_sink_dispose (GObject *object);
 static void empathy_audio_sink_finalize (GObject *object);
 
 static void
+empathy_audio_sink_set_property (GObject *object,
+  guint property_id, const GValue *value, GParamSpec *pspec)
+{
+  switch (property_id)
+    {
+      case PROP_VOLUME:
+        empathy_audio_sink_set_volume (EMPATHY_GST_AUDIO_SINK (object),
+          g_value_get_double (value));
+        break;
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+empathy_audio_sink_get_property (GObject *object,
+  guint property_id, GValue *value, GParamSpec *pspec)
+{
+  switch (property_id)
+    {
+      case PROP_VOLUME:
+        g_value_set_double (value,
+          empathy_audio_sink_get_volume (EMPATHY_GST_AUDIO_SINK (object)));
+        break;
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+
+
+static void
 empathy_audio_sink_class_init (EmpathyGstAudioSinkClass
   *empathy_audio_sink_class)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (empathy_audio_sink_class);
+  GParamSpec *param_spec;
 
   g_type_class_add_private (empathy_audio_sink_class,
     sizeof (EmpathyGstAudioSinkPrivate));
 
   object_class->dispose = empathy_audio_sink_dispose;
   object_class->finalize = empathy_audio_sink_finalize;
+
+  object_class->set_property = empathy_audio_sink_set_property;
+  object_class->get_property = empathy_audio_sink_get_property;
+
+  param_spec = g_param_spec_double ("volume", "Volume", "volume factory",
+    0.0, 5.0, 1.0,
+    G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (object_class, PROP_VOLUME, param_spec);
 }
 
 void
@@ -99,7 +167,10 @@ empathy_audio_sink_dispose (GObject *object)
 
   priv->dispose_has_run = TRUE;
 
-  /* release any references held by the object here */
+  if (priv->notifier != NULL)
+    g_object_unref (priv->notifier);
+  priv->notifier = NULL;
+
 
   if (G_OBJECT_CLASS (empathy_audio_sink_parent_class)->dispose)
     G_OBJECT_CLASS (empathy_audio_sink_parent_class)->dispose (object);
@@ -122,3 +193,22 @@ empathy_audio_sink_new (void)
 {
   return GST_ELEMENT (g_object_new (EMPATHY_TYPE_GST_AUDIO_SINK, NULL));
 }
+
+void
+empathy_audio_sink_set_volume (EmpathyGstAudioSink *sink, gdouble volume)
+{
+  EmpathyGstAudioSinkPrivate *priv = EMPATHY_GST_AUDIO_SINK_GET_PRIVATE (sink);
+
+  g_object_set (G_OBJECT (priv->volume), "volume", volume, NULL);
+}
+
+gdouble
+empathy_audio_sink_get_volume (EmpathyGstAudioSink *sink)
+{
+  EmpathyGstAudioSinkPrivate *priv = EMPATHY_GST_AUDIO_SINK_GET_PRIVATE (sink);
+  gdouble volume;
+
+  g_object_get (G_OBJECT (priv->volume), "volume", &volume, NULL);
+
+  return volume;
+}
diff --git a/libempathy-gtk/empathy-audio-sink.h b/libempathy-gtk/empathy-audio-sink.h
index 8efafde5e..57579dc3e 100644
--- a/libempathy-gtk/empathy-audio-sink.h
+++ b/libempathy-gtk/empathy-audio-sink.h
@@ -58,6 +58,10 @@ GType empathy_audio_sink_get_type (void);
 
 GstElement *empathy_audio_sink_new (void);
 
+void empathy_audio_sink_set_volume (EmpathyGstAudioSink *sink, gdouble volume);
+
+gdouble empathy_audio_sink_get_volume (EmpathyGstAudioSink *sink);
+
 G_END_DECLS
 
 #endif /* #ifndef __EMPATHY_GST_AUDIO_SINK_H__*/