Function gst_ memory_ map 
Source pub unsafe extern "C" fn gst_memory_map(
    mem: *mut GstMemory,
    info: *mut GstMapInfo,
    flags: GstMapFlags,
) -> gbooleanpub unsafe extern "C" fn gst_memory_map(
    mem: *mut GstMemory,
    info: *mut GstMapInfo,
    flags: GstMapFlags,
) -> gboolean