#define GST_CAT_DEFAULT controller_debug
GST_DEBUG_CATEGORY_EXTERN (GST_CAT_DEFAULT);
-static void gst_control_source_class_init (GstControlSourceClass * klass);
-static void gst_control_source_init (GstControlSource * self);
-
G_DEFINE_ABSTRACT_TYPE (GstControlSource, gst_control_source, G_TYPE_OBJECT);
static GObjectClass *parent_class = NULL;