Function gstreamer_rtp_sys::gst_rtp_header_extension_read

pub unsafe extern "C" fn gst_rtp_header_extension_read(
    ext: *mut GstRTPHeaderExtension, 
    read_flags: GstRTPHeaderExtensionFlags, 
    data: *const u8, 
    size: size_t, 
    buffer: *mut GstBuffer
) -> gboolean

This is supported on crate feature v1_20 only.