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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(AVFormatContext *s,
  27.                            AVStream *stream, PayloadContext *data,
  28.                            const char *attr, const char *value)
  29. {
  30.     if (!strcmp(attr, "mode")) {
  31.         int mode = atoi(value);
  32.         switch (mode) {
  33.         case 20:
  34.             stream->codec->block_align = 38;
  35.             break;
  36.         case 30:
  37.             stream->codec->block_align = 50;
  38.             break;
  39.         default:
  40.             av_log(s, AV_LOG_ERROR, "Unsupported iLBC mode %d\n", mode);
  41.             return AVERROR(EINVAL);
  42.         }
  43.     }
  44.     return 0;
  45. }
  46.  
  47. static int ilbc_parse_sdp_line(AVFormatContext *s, int st_index,
  48.                                PayloadContext *data, const char *line)
  49. {
  50.     const char *p;
  51.     AVStream *st;
  52.  
  53.     if (st_index < 0)
  54.         return 0;
  55.     st = s->streams[st_index];
  56.  
  57.     if (av_strstart(line, "fmtp:", &p)) {
  58.         int ret = ff_parse_fmtp(s, st, data, p, ilbc_parse_fmtp);
  59.         if (ret < 0)
  60.             return ret;
  61.         if (!st->codec->block_align) {
  62.             av_log(s, AV_LOG_ERROR, "No iLBC mode set\n");
  63.             return AVERROR(EINVAL);
  64.         }
  65.     }
  66.     return 0;
  67. }
  68.  
  69. RTPDynamicProtocolHandler ff_ilbc_dynamic_handler = {
  70.     .enc_name         = "iLBC",
  71.     .codec_type       = AVMEDIA_TYPE_AUDIO,
  72.     .codec_id         = AV_CODEC_ID_ILBC,
  73.     .parse_sdp_a_line = ilbc_parse_sdp_line,
  74. };
  75.