pub unsafe extern "C" fn gst_rtcp_packet_get_rb( packet: *mut GstRTCPPacket, nth: c_uint, ssrc: *mut u32, fractionlost: *mut u8, packetslost: *mut i32, exthighestseq: *mut u32, jitter: *mut u32, lsr: *mut u32, dlsr: *mut u32)