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  1. /*
  2.  * RTP iLBC Depacketizer, RFC 3952
  3.  * Copyright (c) 2012 Martin Storsjo
  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 "rtpdec_formats.h"
  24. #include "libavutil/avstring.h"
  25.  
  26. static int ilbc_parse_fmtp(AVStream *stream, PayloadContext *data,
  27.                            char *attr, char *value)
  28. {
  29.     if (!strcmp(attr, "mode")) {
  30.         int mode = atoi(value);
  31.         switch (mode) {
  32.         case 20:
  33.             stream->codec->block_align = 38;
  34.             break;
  35.         case 30:
  36.             stream->codec->block_align = 50;
  37.             break;
  38.         default:
  39.             av_log(NULL, AV_LOG_ERROR, "Unsupported iLBC mode %d\n", mode);
  40.             return AVERROR(EINVAL);
  41.         }
  42.     }
  43.     return 0;
  44. }
  45.  
  46. static int ilbc_parse_sdp_line(AVFormatContext *s, int st_index,
  47.                                PayloadContext *data, const char *line)
  48. {
  49.     const char *p;
  50.     AVStream *st;
  51.  
  52.     if (st_index < 0)
  53.         return 0;
  54.     st = s->streams[st_index];
  55.  
  56.     if (av_strstart(line, "fmtp:", &p)) {
  57.         int ret = ff_parse_fmtp(st, data, p, ilbc_parse_fmtp);
  58.         if (ret < 0)
  59.             return ret;
  60.         if (!st->codec->block_align) {
  61.             av_log(s, AV_LOG_ERROR, "No iLBC mode set\n");
  62.             return AVERROR(EINVAL);
  63.         }
  64.     }
  65.     return 0;
  66. }
  67.  
  68. RTPDynamicProtocolHandler ff_ilbc_dynamic_handler = {
  69.     .enc_name         = "iLBC",
  70.     .codec_type       = AVMEDIA_TYPE_AUDIO,
  71.     .codec_id         = AV_CODEC_ID_ILBC,
  72.     .parse_sdp_a_line = ilbc_parse_sdp_line,
  73. };
  74.