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 26static int ilbc_parse_fmtp(AVFormatContext *s, 27 AVStream *stream, PayloadContext *data, 28 char *attr, 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 47static 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 69RTPDynamicProtocolHandler 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