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  1. /*
  2.  * RTP Packetization of MPEG-4 Audio (RFC 3016)
  3.  * Copyright (c) 2011 Juan Carlos Rodriguez <ing.juancarlosrodriguez@hotmail.com>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "avformat.h"
  23. #include "rtpenc.h"
  24.  
  25. void ff_rtp_send_latm(AVFormatContext *s1, const uint8_t *buff, int size)
  26. {
  27.     /* MP4A-LATM
  28.      * The RTP payload format specification is described in RFC 3016
  29.      * The encoding specifications are provided in ISO/IEC 14496-3 */
  30.  
  31.     RTPMuxContext *s = s1->priv_data;
  32.     int header_size;
  33.     int offset = 0;
  34.     int len    = 0;
  35.  
  36.     /* skip ADTS header, if present */
  37.     if ((s1->streams[0]->codec->extradata_size) == 0) {
  38.         size -= 7;
  39.         buff += 7;
  40.     }
  41.  
  42.     /* PayloadLengthInfo() */
  43.     header_size = size/0xFF + 1;
  44.     memset(s->buf, 0xFF, header_size - 1);
  45.     s->buf[header_size - 1] = size % 0xFF;
  46.  
  47.     s->timestamp = s->cur_timestamp;
  48.  
  49.     /* PayloadMux() */
  50.     while (size > 0) {
  51.         len   = FFMIN(size, s->max_payload_size - (!offset ? header_size : 0));
  52.         size -= len;
  53.         if (!offset) {
  54.             memcpy(s->buf + header_size, buff, len);
  55.             ff_rtp_send_data(s1, s->buf, header_size + len, !size);
  56.         } else {
  57.             ff_rtp_send_data(s1, buff + offset, len, !size);
  58.         }
  59.         offset += len;
  60.     }
  61. }
  62.