/*
  * RTP iLBC Depacketizer, RFC 3952
  * Copyright (c) 2012 Martin Storsjo
  *

  * 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 "avformat.h"
 #include "rtpdec_formats.h"
 #include "libavutil/avstring.h"
 

 static int ilbc_parse_fmtp(AVFormatContext *s,
                            AVStream *stream, PayloadContext *data,

                            const char *attr, const char *value)

 {
     if (!strcmp(attr, "mode")) {
         int mode = atoi(value);
         switch (mode) {
         case 20:

             stream->codecpar->block_align = 38;

             break;
         case 30:

             stream->codecpar->block_align = 50;

             break;
         default:

             av_log(s, AV_LOG_ERROR, "Unsupported iLBC mode %d\n", mode);

             return AVERROR(EINVAL);
         }
     }
     return 0;
 }
 
 static int ilbc_parse_sdp_line(AVFormatContext *s, int st_index,
                                PayloadContext *data, const char *line)
 {
     const char *p;
     AVStream *st;
 
     if (st_index < 0)
         return 0;
     st = s->streams[st_index];
 
     if (av_strstart(line, "fmtp:", &p)) {

         int ret = ff_parse_fmtp(s, st, data, p, ilbc_parse_fmtp);

         if (ret < 0)
             return ret;

         if (!st->codecpar->block_align) {

             av_log(s, AV_LOG_ERROR, "No iLBC mode set\n");
             return AVERROR(EINVAL);
         }
     }
     return 0;
 }
 
 RTPDynamicProtocolHandler ff_ilbc_dynamic_handler = {
     .enc_name         = "iLBC",
     .codec_type       = AVMEDIA_TYPE_AUDIO,

     .codec_id         = AV_CODEC_ID_ILBC,

     .parse_sdp_a_line = ilbc_parse_sdp_line,
 };