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
ilbc_parse_fmtp(AVFormatContext * s,AVStream * stream,PayloadContext * data,const char * attr,const char * value)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->codecpar->block_align = 38;
35 break;
36 case 30:
37 stream->codecpar->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
ilbc_parse_sdp_line(AVFormatContext * s,int st_index,PayloadContext * data,const char * line)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->codecpar->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 const 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