GST_CONTROL_SOURCE_GET_CLASS  146 libs/gst/controller/gstcontrolsource.c   g_return_val_if_fail (GST_CONTROL_SOURCE_GET_CLASS (self)->bind, FALSE);
GST_CONTROL_SOURCE_GET_CLASS  149 libs/gst/controller/gstcontrolsource.c   ret = GST_CONTROL_SOURCE_GET_CLASS (self)->bind (self, pspec);