blob: cb48f7661da1811698480c55cfd7dffea1663d38
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->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 | |
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 | 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 |