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rtpdec_ilbc.c
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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 
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->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 
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 };
const char * s
Definition: avisynth_c.h:631
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
RTP/JPEG specific private data.
Definition: rdt.c:83
RTPDynamicProtocolHandler ff_ilbc_dynamic_handler
Definition: rtpdec_ilbc.c:69
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2049
Format I/O context.
Definition: avformat.h:1272
mode
Definition: f_perms.c:27
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1340
static int ilbc_parse_sdp_line(AVFormatContext *s, int st_index, PayloadContext *data, const char *line)
Definition: rtpdec_ilbc.c:47
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
Definition: graph2dot.c:48
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
ret
Definition: avfilter.c:974
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
Stream structure.
Definition: avformat.h:842
int ff_parse_fmtp(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *p, int(*parse_fmtp)(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *attr, const char *value))
Definition: rtpdec.c:850
const char * enc_name
Definition: rtpdec.h:116
int av_strstart(const char *str, const char *pfx, const char **ptr)
Return non-zero if pfx is a prefix of str.
Definition: avstring.c:34
Main libavformat public API header.
static int ilbc_parse_fmtp(AVFormatContext *s, AVStream *stream, PayloadContext *data, const char *attr, const char *value)
Definition: rtpdec_ilbc.c:26