ext/gconf/: When we can't create a fakesink/fakesrc complain instead of unreffing

Original commit message from CVS:
* ext/gconf/gstgconfaudiosrc.c: (gst_gconf_audio_src_reset),
(gst_gconf_audio_src_change_state):
* ext/gconf/gstgconfvideosink.c: (gst_gconf_video_sink_reset),
(gst_gconf_video_sink_change_state):
* ext/gconf/gstgconfvideosrc.c: (gst_gconf_video_src_reset),
(gst_gconf_video_src_change_state):
* ext/gconf/gstswitchsink.c: (gst_switch_sink_reset),
(gst_switch_commit_new_kid), (gst_switch_sink_change_state):
When we can't create a fakesink/fakesrc complain instead of unreffing
NULL pointers and crashing later. See bug #530535.

ChangeLog

@@ -1,3 +1,16 @@
+2008-05-03  Sebastian Dröge  <slomo@circular-chaos.org>
+
+	* ext/gconf/gstgconfaudiosrc.c: (gst_gconf_audio_src_reset),
+	(gst_gconf_audio_src_change_state):
+	* ext/gconf/gstgconfvideosink.c: (gst_gconf_video_sink_reset),
+	(gst_gconf_video_sink_change_state):
+	* ext/gconf/gstgconfvideosrc.c: (gst_gconf_video_src_reset),
+	(gst_gconf_video_src_change_state):
+	* ext/gconf/gstswitchsink.c: (gst_switch_sink_reset),
+	(gst_switch_commit_new_kid), (gst_switch_sink_change_state):
+	When we can't create a fakesink/fakesrc complain instead of unreffing
+	NULL pointers and crashing later. See bug #530535.
+
 2008-05-02  Wim Taymans  <wim.taymans@collabora.co.uk>
 
 	* gst/rtp/gstrtph263pdepay.c: (gst_rtp_h263p_depay_process):

ext/gconf/gstgconfaudiosrc.c

@@ -71,7 +71,7 @@ gst_gconf_audio_src_class_init (GstGConfAudioSrcClass * klass)
  * Hack to make negotiation work.
  */
 
-static void
+static gboolean
 gst_gconf_audio_src_reset (GstGConfAudioSrc * src)
 {
   GstPad *targetpad;
@@ -82,6 +82,10 @@ gst_gconf_audio_src_reset (GstGConfAudioSrc * src)
     gst_bin_remove (GST_BIN (src), src->kid);
   }
   src->kid = gst_element_factory_make ("fakesrc", "testsrc");
+  if (!src->kid) {
+    GST_ERROR_OBJECT (src, "Failed to create fakesrc");
+    return FALSE;
+  }
   gst_bin_add (GST_BIN (src), src->kid);
 
   targetpad = gst_element_get_pad (src->kid, "src");
@@ -90,6 +94,7 @@ gst_gconf_audio_src_reset (GstGConfAudioSrc * src)
 
   g_free (src->gconf_str);
   src->gconf_str = NULL;
+  return TRUE;
 }
 
 static void
@@ -225,7 +230,8 @@ gst_gconf_audio_src_change_state (GstElement * element,
 
   switch (transition) {
     case GST_STATE_CHANGE_READY_TO_NULL:
-      gst_gconf_audio_src_reset (src);
+      if (!gst_gconf_audio_src_reset (src))
+        ret = GST_STATE_CHANGE_FAILURE;
       break;
     default:
       break;

ext/gconf/gstgconfvideosink.c

@@ -70,7 +70,7 @@ gst_gconf_video_sink_class_init (GstGConfVideoSinkClass * klass)
  * Hack to make negotiation work.
  */
 
-static void
+static gboolean
 gst_gconf_video_sink_reset (GstGConfVideoSink * sink)
 {
   GstPad *targetpad;
@@ -81,6 +81,10 @@ gst_gconf_video_sink_reset (GstGConfVideoSink * sink)
     gst_bin_remove (GST_BIN (sink), sink->kid);
   }
   sink->kid = gst_element_factory_make ("fakesink", "testsink");
+  if (!sink->kid) {
+    GST_ERROR_OBJECT (sink, "Failed to create fakesink");
+    return FALSE;
+  }
   gst_bin_add (GST_BIN (sink), sink->kid);
 
   targetpad = gst_element_get_pad (sink->kid, "sink");
@@ -89,6 +93,8 @@ gst_gconf_video_sink_reset (GstGConfVideoSink * sink)
 
   g_free (sink->gconf_str);
   sink->gconf_str = NULL;
+
+  return TRUE;
 }
 
 static void
@@ -223,7 +229,8 @@ gst_gconf_video_sink_change_state (GstElement * element,
 
   switch (transition) {
     case GST_STATE_CHANGE_READY_TO_NULL:
-      gst_gconf_video_sink_reset (sink);
+      if (!gst_gconf_video_sink_reset (sink))
+        ret = GST_STATE_CHANGE_FAILURE;
       break;
     default:
       break;

ext/gconf/gstgconfvideosrc.c

@@ -71,7 +71,7 @@ gst_gconf_video_src_class_init (GstGConfVideoSrcClass * klass)
  * Hack to make negotiation work.
  */
 
-static void
+static gboolean
 gst_gconf_video_src_reset (GstGConfVideoSrc * src)
 {
   GstPad *targetpad;
@@ -82,6 +82,10 @@ gst_gconf_video_src_reset (GstGConfVideoSrc * src)
     gst_bin_remove (GST_BIN (src), src->kid);
   }
   src->kid = gst_element_factory_make ("fakesrc", "testsrc");
+  if (!src->kid) {
+    GST_ERROR_OBJECT (src, "Failed to create fakesrc");
+    return FALSE;
+  }
   gst_bin_add (GST_BIN (src), src->kid);
 
   targetpad = gst_element_get_pad (src->kid, "src");
@@ -90,6 +94,8 @@ gst_gconf_video_src_reset (GstGConfVideoSrc * src)
 
   g_free (src->gconf_str);
   src->gconf_str = NULL;
+
+  return TRUE;
 }
 
 static void
@@ -217,7 +223,8 @@ gst_gconf_video_src_change_state (GstElement * element,
 
   switch (transition) {
     case GST_STATE_CHANGE_READY_TO_NULL:
-      gst_gconf_video_src_reset (src);
+      if (!gst_gconf_video_src_reset (src))
+        ret = GST_STATE_CHANGE_FAILURE;
       break;
     default:
       break;

ext/gconf/gstswitchsink.c

@@ -76,15 +76,17 @@ gst_switch_sink_class_init (GstSwitchSinkClass * klass)
   }
 }
 
-static void
+static gboolean
 gst_switch_sink_reset (GstSwitchSink * sink)
 {
   /* this will install fakesink if no other child has been set,
    * otherwise we rely on the subclass to know when to unset its
    * custom kid */
   if (sink->kid == NULL) {
-    gst_switch_sink_set_child (sink, NULL);
+    return gst_switch_sink_set_child (sink, NULL);
   }
+
+  return TRUE;
 }
 
 static void
@@ -143,6 +145,10 @@ gst_switch_commit_new_kid (GstSwitchSink * sink)
   if (new_kid == NULL) {
     GST_DEBUG_OBJECT (sink, "Replacing kid with fakesink");
     new_kid = gst_element_factory_make ("fakesink", "testsink");
+    if (new_kid == NULL) {
+      GST_ERROR_OBJECT (sink, "Failed to create fakesink");
+      return FALSE;
+    }
     /* Add a reference, as it would if the element came from sink->new_kid */
     gst_object_ref (new_kid);
     g_object_set (new_kid, "sync", TRUE, NULL);
@@ -299,7 +305,8 @@ gst_switch_sink_change_state (GstElement * element, GstStateChange transition)
 
   switch (transition) {
     case GST_STATE_CHANGE_READY_TO_NULL:
-      gst_switch_sink_reset (sink);
+      if (!gst_switch_sink_reset (sink))
+        ret = GST_STATE_CHANGE_FAILURE;
       break;
     default:
       break;