dup_color_balance: check that element currently implements GstColorBalance

https://bugzilla.gnome.org/show_bug.cgi?id=658584

diff --git a/src/empathy-video-src.c b/src/empathy-video-src.c
index da86eda935b026ad26a6717283efc742d5b8d628..ca8370d82b66ce45592529ec95c0665043f5813a 100644 (file)
--- a/src/empathy-video-src.c
+++ b/src/empathy-video-src.c
@@ -256,6 +256,15 @@ dup_color_balance (GstElement *src)
   if (color == NULL)
     return NULL;
 
+  /* colorbalance is wrapped by GstImplementsInterface, we
+   * need to check if it is actually supported for this instance
+   * in its current state before trying to use it */
+  if (!GST_IS_COLOR_BALANCE (color))
+    {
+      g_object_unref (color);
+      return NULL;
+    }
+
   return GST_COLOR_BALANCE (color);
 }