Function gstreamer_rtp_sys::gst_rtcp_packet_xr_get_voip_signal_metrics

pub unsafe extern "C" fn gst_rtcp_packet_xr_get_voip_signal_metrics(
    packet: *mut GstRTCPPacket, 
    signal_level: *mut u8, 
    noise_level: *mut u8, 
    rerl: *mut u8, 
    gmin: *mut u8
) -> gboolean

This is supported on crate feature v1_16 only.