-static void __mmplayer_gst_decode_unknown_type(GstElement *elem, GstPad *pad, GstCaps *caps, gpointer data);
-static gboolean __mmplayer_gst_decode_autoplug_continue(GstElement *bin, GstPad *pad, GstCaps *caps, gpointer data);
-static void __mmplayer_gst_decode_pad_removed(GstElement *elem, GstPad *new_pad, gpointer data);
-static void __mmplayer_gst_decode_drained(GstElement *bin, gpointer data);
-static void __mmplayer_pipeline_complete(GstElement *decodebin, gpointer data);