/*
  * RTP packetizer for VP9 payload format (draft version 02) - experimental
  * Copyright (c) 2016 Thomas Volkert <thomas@netzeal.de>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "rtpenc.h"
 
 #define RTP_VP9_DESC_REQUIRED_SIZE 1
 
 void ff_rtp_send_vp9(AVFormatContext *ctx, const uint8_t *buf, int size)
 {
     RTPMuxContext *rtp_ctx = ctx->priv_data;
     int len;
 
     rtp_ctx->timestamp  = rtp_ctx->cur_timestamp;
     rtp_ctx->buf_ptr    = rtp_ctx->buf;
 
     /* mark the first fragment */
     *rtp_ctx->buf_ptr++ = 0x08;
 
     while (size > 0) {
         len = FFMIN(size, rtp_ctx->max_payload_size - RTP_VP9_DESC_REQUIRED_SIZE);
 
         if (len == size) {
             /* mark the last fragment */
             rtp_ctx->buf[0] |= 0x04;
         }
 
         memcpy(rtp_ctx->buf_ptr, buf, len);
         ff_rtp_send_data(ctx, rtp_ctx->buf, len + RTP_VP9_DESC_REQUIRED_SIZE, size == len);
 
         size            -= len;
         buf             += len;
 
         /* clear the end bit */
         rtp_ctx->buf[0] &= ~0x08;
     }
 }