/*
  * RTP VP8 Packetizer
  * Copyright (c) 2010 Josh Allmann
  *
  * 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"
 
 /* Based on a draft spec for VP8 RTP.

  * ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */

 void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
 {
     RTPMuxContext *s = s1->priv_data;

     int len, max_packet_size, header_size;

 
     s->buf_ptr      = s->buf;
     s->timestamp    = s->cur_timestamp;
 

     // extended control bit set, reference frame, start of partition,

     // partition id 0

     *s->buf_ptr++ = 0x90;
     *s->buf_ptr++ = 0x80; // Picture id present
     *s->buf_ptr++ = s->frame_count++ & 0x7f;
     // Calculate the number of remaining bytes
     header_size     = s->buf_ptr - s->buf;
     max_packet_size = s->max_payload_size - header_size;
 

     while (size > 0) {
         len = FFMIN(size, max_packet_size);
 
         memcpy(s->buf_ptr, buf, len);

         // marker bit is last packet in frame
         ff_rtp_send_data(s1, s->buf, len + header_size, size == len);

 
         size         -= len;
         buf          += len;

         // Clear the partition start bit, keep the rest of the header untouched
         s->buf[0]    &= ~0x10;

     }
 }