ges: Fix several memory leaks

https://bugzilla.gnome.org/show_bug.cgi?id=710390

ges/ges-audio-source.c

@@ -88,6 +88,7 @@ ges_audio_source_create_element (GESTrackElement * trksrc)
   _sync_element_to_layer_property_float (trksrc, volume, GES_META_VOLUME,
       "volume");
   ges_track_element_add_children_props (trksrc, volume, NULL, NULL, props);
+  gst_object_unref (volume);
 
   return topbin;
 }

ges/ges-image-source.c

@@ -98,10 +98,9 @@ pad_added_cb (GstElement * timeline, GstPad * pad, GstElement * scale)
     GST_DEBUG ("got sink pad, trying to link");
 
     ret = gst_pad_link (pad, sinkpad);
-    if GST_PAD_LINK_SUCCESSFUL
-      (ret) {
-      GST_DEBUG ("linked ok, returning");
     gst_object_unref (sinkpad);
+    if (GST_PAD_LINK_SUCCESSFUL (ret)) {
+      GST_DEBUG ("linked ok, returning");
       return;
     }
   }

ges/ges-pipeline.c

@@ -733,6 +733,7 @@ pad_removed_cb (GstElement * timeline, GstPad * pad, GESPipeline * self)
     gst_object_unref (peer);
     gst_element_release_request_pad (self->priv->encodebin,
         chain->encodebinpad);
+    gst_object_unref (chain->encodebinpad);
   }
 
   /* Unlink playsink */

ges/ges-smart-adder.c

@@ -63,8 +63,10 @@ destroy_pad (PadInfos * infos)
     gst_bin_remove (GST_BIN (infos->self), infos->bin);
   }
 
-  if (infos->adder_pad)
+  if (infos->adder_pad) {
     gst_element_release_request_pad (infos->self->adder, infos->adder_pad);
+    gst_object_unref (infos->adder_pad);
+  }
   g_slice_free (PadInfos, infos);
 }
 
@@ -191,6 +193,7 @@ ges_smart_adder_init (GESSmartAdder * self)
   pad = gst_element_get_static_pad (self->adder, "src");
   self->srcpad = gst_ghost_pad_new ("src", pad);
   gst_pad_set_active (self->srcpad, TRUE);
+  gst_object_unref (pad);
 
   gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
 

ges/ges-smart-video-mixer.c

@@ -59,8 +59,10 @@ destroy_pad (PadInfos * infos)
     gst_bin_remove (GST_BIN (infos->self), infos->bin);
   }
 
-  if (infos->mixer_pad)
+  if (infos->mixer_pad) {
     gst_element_release_request_pad (infos->self->mixer, infos->mixer_pad);
+    gst_object_unref (infos->mixer_pad);
+  }
 
   g_slice_free (PadInfos, infos);
 }
@@ -216,7 +218,7 @@ ges_smart_mixer_init (GESSmartMixer * self)
   pad = gst_element_get_static_pad (self->mixer, "src");
   self->srcpad = gst_ghost_pad_new ("src", pad);
   gst_pad_set_active (self->srcpad, TRUE);
-
+  gst_object_unref (pad);
   gst_element_add_pad (GST_ELEMENT (self), self->srcpad);
 
   self->pads_infos = g_hash_table_new_full (g_direct_hash, g_direct_equal,

ges/ges-source.c

@@ -116,6 +116,9 @@ ges_source_create_topbin (const gchar * bin_name, GstElement * sub_element, ...)
         G_CALLBACK (_ghost_pad_added_cb), bin);
   }
 
+  if (sub_srcpad)
+    gst_object_unref (sub_srcpad);
+
   return bin;
 }
 

ges/ges-title-source.c

@@ -144,7 +144,7 @@ ges_title_source_create_source (GESTrackElement * object)
   GESTitleSource *self = GES_TITLE_SOURCE (object);
   GESTitleSourcePrivate *priv = self->priv;
   GstElement *topbin, *background, *text;
-  GstPad *src;
+  GstPad *src, *pad;
 
   topbin = gst_bin_new ("titlesrc-bin");
   background = gst_element_factory_make ("videotestsrc", "titlesrc-bg");
@@ -172,7 +172,9 @@ ges_title_source_create_source (GESTrackElement * object)
   gst_element_link_pads_full (background, "src", text, "video_sink",
       GST_PAD_LINK_CHECK_NOTHING);
 
-  src = gst_ghost_pad_new ("src", gst_element_get_static_pad (text, "src"));
+  pad = gst_element_get_static_pad (text, "src");
+  src = gst_ghost_pad_new ("src", pad);
+  gst_object_unref (pad);
   gst_element_add_pad (topbin, src);
 
   gst_object_ref (text);

ges/ges-track.c

@@ -265,10 +265,12 @@ pad_added_cb (GstElement * element, GstPad * pad, GESTrack * track)
   GST_DEBUG ("track:%p, pad %s:%s", track, GST_DEBUG_PAD_NAME (pad));
 
   gst_pad_link (pad, capsfilter_sink);
+  gst_object_unref (capsfilter_sink);
 
   capsfilter_src = gst_element_get_static_pad (priv->capsfilter, "src");
   /* ghost the pad */
   priv->srcpad = gst_ghost_pad_new ("src", capsfilter_src);
+  gst_object_unref (capsfilter_src);
   gst_pad_set_active (priv->srcpad, TRUE);
   gst_element_add_pad (GST_ELEMENT (track), priv->srcpad);
 
@@ -423,6 +425,9 @@ ges_track_dispose (GObject * object)
   g_sequence_free (priv->trackelements_by_start);
   g_list_free_full (priv->gaps, (GDestroyNotify) free_gap);
 
+  if (priv->mixing_operation)
+    gst_object_unref (priv->mixing_operation);
+
   if (priv->composition) {
     gst_bin_remove (GST_BIN (object), priv->composition);
     priv->composition = NULL;
@@ -758,6 +763,8 @@ ges_track_set_mixing (GESTrack * track, gboolean mixing)
   }
 
   if (mixing) {
+    // increase ref count to hold the object
+    gst_object_ref (track->priv->mixing_operation);
     if (!gst_bin_add (GST_BIN (track->priv->composition),
             track->priv->mixing_operation)) {
       GST_WARNING_OBJECT (track, "Could not add the mixer to our composition");

ges/ges-video-track.c

@@ -90,6 +90,8 @@ create_element_for_raw_video_gap (GESTrack * track)
 
   _sync_capsfilter_with_track (track, capsfilter);
 
+  gst_object_unref (capsfilter);
+
   return bin;
 }