Function gstreamer_rtsp_sys::gst_rtsp_message_get_header

pub unsafe extern "C" fn gst_rtsp_message_get_header(
    msg: *const GstRTSPMessage, 
    field: GstRTSPHeaderField, 
    value: *mut *mut c_char, 
    indx: c_int
) -> GstRTSPResult