pub unsafe extern "C" fn gst_rtsp_message_append_headers(
msg: *const GstRTSPMessage,
str: *mut GString,
) -> GstRTSPResult
pub unsafe extern "C" fn gst_rtsp_message_append_headers(
msg: *const GstRTSPMessage,
str: *mut GString,
) -> GstRTSPResult