[empathy/gnome-3-4] audiosrc: Don't use stream volumes properties if the src doesn't support them

[Sjoerd Simons <sjoerds src gnome org>]

commit 108b3fa233660bdd0e88ac2d4642a75efa8f1eb7
Author: Sjoerd Simons <sjoerd luon net>
Date:   Mon May 21 13:44:06 2012 +0200

    audiosrc: Don't use stream volumes properties if the src doesn't support them

 src/empathy-audio-src.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/src/empathy-audio-src.c b/src/empathy-audio-src.c
index 5a82979..ca08614 100644
--- a/src/empathy-audio-src.c
+++ b/src/empathy-audio-src.c
@@ -75,6 +75,7 @@ struct _EmpathyGstAudioSrcPrivate
 
   gdouble volume;
   gboolean mute;
+  gboolean have_stream_volume;
 
   GMutex *lock;
   guint level_idle_id;
@@ -97,7 +98,8 @@ empathy_audio_set_hw_mute (EmpathyGstAudioSrc *self, gboolean mute)
   if (mute == self->priv->mute)
     return;
 
-  g_object_set (self->priv->src, "mute", mute, NULL);
+  if (self->priv->have_stream_volume)
+    g_object_set (self->priv->src, "mute", mute, NULL);
 
   /* Belt and braces: If for some reason the underlying src doesn't mute
    * correctly or doesn't update us when it unmutes correctly enforce it using
@@ -124,7 +126,8 @@ empathy_audio_src_set_hw_volume (EmpathyGstAudioSrc *self,
   if (volume == self->priv->volume)
     return;
 
-  g_object_set (self->priv->src, "volume", volume, NULL);
+  if (self->priv->have_stream_volume)
+    g_object_set (self->priv->src, "volume", volume, NULL);
   self->priv->volume = volume;
 }
 
@@ -293,6 +296,8 @@ empathy_audio_src_init (EmpathyGstAudioSrc *obj)
     {
       gdouble volume;
       gboolean mute;
+
+      priv->have_stream_volume = TRUE;
       /* We can't do a bidirection bind as the ::notify comes from another
        * thread, for other bits of empathy it's most simpler if it comes from
        * the main thread */
@@ -313,6 +318,11 @@ empathy_audio_src_init (EmpathyGstAudioSrc *obj)
       g_signal_connect (priv->src, "notify::mute",
         G_CALLBACK (empathy_audio_src_volume_changed), obj);
     }
+  else
+    {
+      g_message ("No stream volume available :(, mute will work though");
+      priv->have_stream_volume = FALSE;
+    }
 
   gst_bin_add (GST_BIN (obj), priv->src);