FFmpeg
Main Page
Related Pages
Modules
Namespaces
Data Structures
Files
Examples
File List
Globals
All
Data Structures
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Macros
Groups
Pages
libavformat
soxenc.c
Go to the documentation of this file.
1
/*
2
* SoX native format muxer
3
* Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
4
*
5
* Based on libSoX sox-fmt.c
6
* Copyright (c) 2008 robs@users.sourceforge.net
7
*
8
* This file is part of FFmpeg.
9
*
10
* FFmpeg is free software; you can redistribute it and/or
11
* modify it under the terms of the GNU Lesser General Public
12
* License as published by the Free Software Foundation; either
13
* version 2.1 of the License, or (at your option) any later version.
14
*
15
* FFmpeg is distributed in the hope that it will be useful,
16
* but WITHOUT ANY WARRANTY; without even the implied warranty of
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
* Lesser General Public License for more details.
19
*
20
* You should have received a copy of the GNU Lesser General Public
21
* License along with FFmpeg; if not, write to the Free Software
22
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23
*/
24
25
/**
26
* @file
27
* SoX native format muxer
28
* @author Daniel Verkamp
29
* @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
30
*/
31
32
#include "
libavutil/intreadwrite.h
"
33
#include "
libavutil/intfloat.h
"
34
#include "
libavutil/dict.h
"
35
#include "
avformat.h
"
36
#include "
avio_internal.h
"
37
#include "
rawenc.h
"
38
#include "
sox.h
"
39
40
typedef
struct
{
41
int64_t
header_size
;
42
}
SoXContext
;
43
44
static
int
sox_write_header
(
AVFormatContext
*
s
)
45
{
46
SoXContext
*sox = s->
priv_data
;
47
AVIOContext
*pb = s->
pb
;
48
AVCodecContext
*enc = s->
streams
[0]->
codec
;
49
AVDictionaryEntry
*comment;
50
size_t
comment_len = 0, comment_size;
51
52
comment =
av_dict_get
(s->
metadata
,
"comment"
, NULL, 0);
53
if
(comment)
54
comment_len = strlen(comment->
value
);
55
comment_size =
FFALIGN
(comment_len, 8);
56
57
sox->
header_size
=
SOX_FIXED_HDR
+ comment_size;
58
59
if
(enc->
codec_id
==
AV_CODEC_ID_PCM_S32LE
) {
60
ffio_wfourcc
(pb,
".SoX"
);
61
avio_wl32
(pb, sox->
header_size
);
62
avio_wl64
(pb, 0);
/* number of samples */
63
avio_wl64
(pb,
av_double2int
(enc->
sample_rate
));
64
avio_wl32
(pb, enc->
channels
);
65
avio_wl32
(pb, comment_size);
66
}
else
if
(enc->
codec_id
==
AV_CODEC_ID_PCM_S32BE
) {
67
ffio_wfourcc
(pb,
"XoS."
);
68
avio_wb32
(pb, sox->
header_size
);
69
avio_wb64
(pb, 0);
/* number of samples */
70
avio_wb64
(pb,
av_double2int
(enc->
sample_rate
));
71
avio_wb32
(pb, enc->
channels
);
72
avio_wb32
(pb, comment_size);
73
}
else
{
74
av_log
(s,
AV_LOG_ERROR
,
"invalid codec; use pcm_s32le or pcm_s32be\n"
);
75
return
-1;
76
}
77
78
if
(comment_len)
79
avio_write
(pb, comment->
value
, comment_len);
80
81
ffio_fill
(pb, 0, comment_size - comment_len);
82
83
avio_flush
(pb);
84
85
return
0;
86
}
87
88
static
int
sox_write_trailer
(
AVFormatContext
*
s
)
89
{
90
SoXContext
*sox = s->
priv_data
;
91
AVIOContext
*pb = s->
pb
;
92
AVCodecContext
*enc = s->
streams
[0]->
codec
;
93
94
if
(s->
pb
->
seekable
) {
95
/* update number of samples */
96
int64_t file_size =
avio_tell
(pb);
97
int64_t num_samples = (file_size - sox->
header_size
- 4LL) >> 2LL;
98
avio_seek
(pb, 8, SEEK_SET);
99
if
(enc->
codec_id
==
AV_CODEC_ID_PCM_S32LE
) {
100
avio_wl64
(pb, num_samples);
101
}
else
102
avio_wb64
(pb, num_samples);
103
avio_seek
(pb, file_size, SEEK_SET);
104
105
avio_flush
(pb);
106
}
107
108
return
0;
109
}
110
111
AVOutputFormat
ff_sox_muxer
= {
112
.
name
=
"sox"
,
113
.long_name =
NULL_IF_CONFIG_SMALL
(
"SoX native"
),
114
.extensions =
"sox"
,
115
.priv_data_size =
sizeof
(
SoXContext
),
116
.audio_codec =
AV_CODEC_ID_PCM_S32LE
,
117
.video_codec =
AV_CODEC_ID_NONE
,
118
.
write_header
=
sox_write_header
,
119
.
write_packet
=
ff_raw_write_packet
,
120
.
write_trailer
=
sox_write_trailer
,
121
};
Generated on Wed Jul 10 2013 23:48:14 for FFmpeg by
1.8.2