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