playbin2: remove the group cond + cleanups

Remove the group GCond that we used for waiting for groups to finish because we
use pad blocking on the selectors and counters instead for waiting for the
groups to complete.

remove the obsolete about_to_finish variable set while emiting the
about-to-finish signal and fix some old comments.

We don't need to take the playbin lock when querying the uridecodebin.

gst/playback/gstplaybin2.c

@@ -251,13 +251,8 @@ struct _GstSourceSelect
 };
 
 #define GST_SOURCE_GROUP_GET_LOCK(group) (((GstSourceGroup*)(group))->lock)
-#define GST_SOURCE_GROUP_GET_COND(group) (((GstSourceGroup*)(group))->cond)
 #define GST_SOURCE_GROUP_LOCK(group) (g_mutex_lock (GST_SOURCE_GROUP_GET_LOCK(group)))
 #define GST_SOURCE_GROUP_UNLOCK(group) (g_mutex_unlock (GST_SOURCE_GROUP_GET_LOCK(group)))
-#define GST_SOURCE_GROUP_WAIT(group) (g_cond_wait \
-		(GST_SOURCE_GROUP_GET_COND (group),GST_SOURCE_GROUP_GET_LOCK(group)))
-#define GST_SOURCE_GROUP_BROADCAST(group) (g_cond_broadcast \
-		(GST_SOURCE_GROUP_GET_COND (group)))
 
 /* a structure to hold the objects for decoding a uri and the subtitle uri
  */
@@ -266,7 +261,6 @@ struct _GstSourceGroup
   GstPlayBin *playbin;
 
   GMutex *lock;
-  GCond *cond;
 
   gboolean valid;               /* the group has valid info to start playback */
   gboolean active;              /* the group is active */
@@ -342,8 +336,6 @@ struct _GstPlayBin
   GstSourceGroup *curr_group;   /* pointer to the currently playing group */
   GstSourceGroup *next_group;   /* pointer to the next group */
 
-  gboolean about_to_finish;     /* the about-to-finish signal is emitted */
-
   /* properties */
   guint connection_speed;       /* connection speed in bits/sec (0 = unknown) */
   gint current_video;           /* the currently selected stream */
@@ -943,7 +935,6 @@ init_group (GstPlayBin * playbin, GstSourceGroup * group)
   group->audio_channels = g_ptr_array_new ();
   group->text_channels = g_ptr_array_new ();
   group->lock = g_mutex_new ();
-  group->cond = g_cond_new ();
   /* init selectors */
   group->playbin = playbin;
   group->selector[0].media = "audio/x-raw-";
@@ -971,7 +962,6 @@ free_group (GstPlayBin * playbin, GstSourceGroup * group)
   g_ptr_array_free (group->audio_channels, TRUE);
   g_ptr_array_free (group->text_channels, TRUE);
   g_mutex_free (group->lock);
-  g_cond_free (group->cond);
 }
 
 static void
@@ -1959,18 +1949,6 @@ no_more_pads_cb (GstElement * decodebin, GstSourceGroup * group)
   } else {
     GST_LOG_OBJECT (playbin, "have more pending groups");
     configure = FALSE;
-    /* check if there are more decodebins to wait for */
-    while (group->pending) {
-      GST_DEBUG_OBJECT (playbin, "%d pending in group %p, waiting",
-          group->pending, group);
-
-      GST_PLAY_BIN_SHUTDOWN_UNLOCK (playbin);
-
-      /* FIXME, unlock when shutting down */
-      GST_SOURCE_GROUP_WAIT (group);
-
-      GST_PLAY_BIN_SHUTDOWN_LOCK (playbin, shutdown2);
-    }
   }
   GST_SOURCE_GROUP_UNLOCK (group);
 
@@ -1992,8 +1970,6 @@ no_more_pads_cb (GstElement * decodebin, GstSourceGroup * group)
             NULL);
       }
     }
-    GST_DEBUG_OBJECT (playbin, "signal other decodebins");
-    GST_SOURCE_GROUP_BROADCAST (group);
     GST_SOURCE_GROUP_UNLOCK (group);
   }
 
@@ -2001,11 +1977,6 @@ no_more_pads_cb (GstElement * decodebin, GstSourceGroup * group)
 
   return;
 
-shutdown2:
-  {
-    GST_SOURCE_GROUP_UNLOCK (group);
-    goto shutdown;
-  }
 shutdown:
   {
     GST_DEBUG ("ignoring, we are shutting down");
@@ -2046,17 +2017,11 @@ drained_cb (GstElement * decodebin, GstSourceGroup * group)
 
   GST_DEBUG_OBJECT (playbin, "about to finish in group %p", group);
 
-  /* mark us as sending out the about-to-finish signal. When the app sets a URI
-   * when this signal is emitted, we're marking it as next-uri */
-  playbin->about_to_finish = TRUE;
-
   /* after this call, we should have a next group to activate or we EOS */
   g_signal_emit (G_OBJECT (playbin),
       gst_play_bin_signals[SIGNAL_ABOUT_TO_FINISH], 0, NULL);
 
-  playbin->about_to_finish = FALSE;
+  /* now activate the next group. If the app did not set a uri, this will
-
-  /* now activate the next group. If the app did not set a next-uri, this will
    * fail and we can do EOS */
   setup_next_source (playbin);
 }
@@ -2170,8 +2135,9 @@ notify_source_cb (GstElement * uridecodebin, GParamSpec * pspec,
 
   playbin = group->playbin;
 
-  GST_OBJECT_LOCK (playbin);
   g_object_get (group->uridecodebin, "source", &source, NULL);
+
+  GST_OBJECT_LOCK (playbin);
   if (playbin->source)
     gst_object_unref (playbin->source);
   playbin->source = source;