FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ircamenc.c
Go to the documentation of this file.
1 /*
2  * IRCAM muxer
3  * Copyright (c) 2012 Paul B Mahol
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 "libavutil/intreadwrite.h"
23 #include "avformat.h"
24 #include "avio_internal.h"
25 #include "internal.h"
26 #include "rawenc.h"
27 #include "ircam.h"
28 
30 {
31  AVCodecParameters *par = s->streams[0]->codecpar;
32  uint32_t tag;
33 
34  if (s->nb_streams != 1) {
35  av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
36  return AVERROR(EINVAL);
37  }
38 
40  if (!tag) {
41  av_log(s, AV_LOG_ERROR, "unsupported codec\n");
42  return AVERROR(EINVAL);
43  }
44 
45  avio_wl32(s->pb, 0x0001A364);
47  avio_wl32(s->pb, par->channels);
48  avio_wl32(s->pb, tag);
49  ffio_fill(s->pb, 0, 1008);
50  return 0;
51 }
52 
54  .name = "ircam",
55  .extensions = "sf,ircam",
56  .long_name = NULL_IF_CONFIG_SMALL("Berkeley/IRCAM/CARL Sound Format"),
57  .audio_codec = AV_CODEC_ID_PCM_S16LE,
58  .video_codec = AV_CODEC_ID_NONE,
59  .write_header = ircam_write_header,
60  .write_packet = ff_raw_write_packet,
61  .codec_tag = (const AVCodecTag *const []){ ff_codec_ircam_le_tags, 0 },
62 };
const char * s
Definition: avisynth_c.h:768
static int ircam_write_header(AVFormatContext *s)
Definition: ircamenc.c:29
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3981
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition: utils.c:3014
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3973
uint32_t av_q2intfloat(AVRational q)
Convert an AVRational to a IEEE 32-bit float expressed in fixed-point format.
Definition: rational.c:152
Format I/O context.
Definition: avformat.h:1338
void avio_wl32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:346
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1406
uint32_t tag
Definition: movenc.c:1412
#define av_log(a,...)
const AVCodecTag ff_codec_ircam_le_tags[]
Definition: ircam.c:25
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1394
void ffio_fill(AVIOContext *s, int b, int count)
Definition: aviobuf.c:190
const char * name
Definition: avformat.h:524
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
AVIOContext * pb
I/O context.
Definition: avformat.h:1380
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int sample_rate
Audio only.
Definition: avcodec.h:4091
Main libavformat public API header.
AVOutputFormat ff_ircam_muxer
Definition: ircamenc.c:53
int channels
Audio only.
Definition: avcodec.h:4087
AVCodecParameters * codecpar
Definition: avformat.h:1241