Function gstreamer_rtp_sys::gst_rtcp_packet_xr_get_voip_packet_metrics

pub unsafe extern "C" fn gst_rtcp_packet_xr_get_voip_packet_metrics(
    packet: *mut GstRTCPPacket, 
    loss_rate: *mut u8, 
    discard_rate: *mut u8
) -> gboolean

This is supported on crate feature v1_16 only.