Function switch_rtp_write_frame 

pub unsafe extern "C" fn switch_rtp_write_frame(
    rtp_session: *mut switch_rtp_t,
    frame: *mut switch_frame_t,
) -> c_int

\brief Write data to a given RTP session \param rtp_session the RTP session to write to \param frame the frame to write \return the number of bytes written