gst_message_parse_structure_change 1321 gst/gstbin.c           gst_message_parse_structure_change (message, NULL, &owner, NULL);
gst_message_parse_structure_change 3270 gst/gstbin.c         gst_message_parse_structure_change (message, NULL, NULL, &busy);
gst_message_parse_structure_change  457 gst/gstmessage.h void            gst_message_parse_structure_change (GstMessage *message, GstStructureChangeType *type,