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2ba45a60 DM |
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 | 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 | ||
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->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 | ||
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 | }; |