Function gst_ rtp_ buffer_ set_ packet_ len 
Source pub unsafe extern "C" fn gst_rtp_buffer_set_packet_len(
    rtp: *mut GstRTPBuffer,
    len: c_uint,
)pub unsafe extern "C" fn gst_rtp_buffer_set_packet_len(
    rtp: *mut GstRTPBuffer,
    len: c_uint,
)