FFmpeg
2.6.9
Main Page
Related Pages
Modules
Namespaces
Data Structures
Files
Examples
File List
Globals
All
Data Structures
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Macros
Modules
Pages
libavformat
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
29
static
int
ircam_write_header
(
AVFormatContext
*
s
)
30
{
31
AVCodecContext
*codec = s->
streams
[0]->
codec
;
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
39
tag =
ff_codec_get_tag
(
ff_codec_ircam_le_tags
, codec->
codec_id
);
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);
46
avio_wl32
(s->
pb
,
av_float2int
(codec->
sample_rate
));
47
avio_wl32
(s->
pb
, codec->
channels
);
48
avio_wl32
(s->
pb
, tag);
49
ffio_fill
(s->
pb
, 0, 1008);
50
return
0;
51
}
52
53
AVOutputFormat
ff_ircam_muxer
= {
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
};
s
const char * s
Definition:
avisynth_c.h:669
AV_CODEC_ID_NONE
Definition:
avcodec.h:103
ircam_write_header
static int ircam_write_header(AVFormatContext *s)
Definition:
ircamenc.c:29
ircam.h
ff_codec_get_tag
unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id)
Definition:
utils.c:2695
AVFormatContext
Format I/O context.
Definition:
avformat.h:1226
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition:
aviobuf.c:318
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition:
avformat.h:1294
AVCodecTag
Definition:
internal.h:40
avio_internal.h
tag
uint32_t tag
Definition:
movenc.c:1332
av_log
#define av_log(a,...)
Definition:
tableprint_vlc.h:28
ff_codec_ircam_le_tags
const AVCodecTag ff_codec_ircam_le_tags[]
Definition:
ircam.c:25
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:175
AVERROR
#define AVERROR(e)
Definition:
error.h:43
rawenc.h
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition:
internal.h:180
internal.h
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition:
avformat.h:826
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition:
avformat.h:1282
ffio_fill
void ffio_fill(AVIOContext *s, int b, int count)
Definition:
aviobuf.c:163
intreadwrite.h
AVOutputFormat::name
const char * name
Definition:
avformat.h:478
ff_raw_write_packet
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition:
rawenc.c:26
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition:
avcodec.h:1256
AVCodecContext::sample_rate
int sample_rate
samples per second
Definition:
avcodec.h:1983
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition:
avformat.h:1268
AVCodecContext
main external API structure.
Definition:
avcodec.h:1239
av_float2int
static av_always_inline uint32_t av_float2int(float f)
Reinterpret a float as a 32-bit integer.
Definition:
intfloat.h:50
avformat.h
Main libavformat public API header.
AV_CODEC_ID_PCM_S16LE
Definition:
avcodec.h:327
AVOutputFormat
Definition:
avformat.h:477
ff_ircam_muxer
AVOutputFormat ff_ircam_muxer
Definition:
ircamenc.c:53
AVCodecContext::channels
int channels
number of audio channels
Definition:
avcodec.h:1984
Generated on Tue Jun 21 2022 16:20:07 for FFmpeg by
1.8.8