Function gst_ event_ parse_ gap 
Source pub unsafe extern "C" fn gst_event_parse_gap(
    event: *mut GstEvent,
    timestamp: *mut GstClockTime,
    duration: *mut GstClockTime,
)pub unsafe extern "C" fn gst_event_parse_gap(
    event: *mut GstEvent,
    timestamp: *mut GstClockTime,
    duration: *mut GstClockTime,
)