Function gstreamer_rtsp_sys::gst_rtsp_connection_poll_usec

pub unsafe extern "C" fn gst_rtsp_connection_poll_usec(
    conn: *mut GstRTSPConnection, 
    events: GstRTSPEvent, 
    revents: *mut GstRTSPEvent, 
    timeout: i64
) -> GstRTSPResult

This is supported on crate feature v1_18 only.