Function gst_ rtsp_ stream_ recv_ rtp 
Source pub unsafe extern "C" fn gst_rtsp_stream_recv_rtp(
    stream: *mut GstRTSPStream,
    buffer: *mut GstBuffer,
) -> GstFlowReturnpub unsafe extern "C" fn gst_rtsp_stream_recv_rtp(
    stream: *mut GstRTSPStream,
    buffer: *mut GstBuffer,
) -> GstFlowReturn