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
wvenc.c
Go to the documentation of this file.
1
/*
2
* WavPack muxer
3
* Copyright (c) 2013 Konstantin Shishkov <kostya.shishkov@gmail.com>
4
* Copyright (c) 2012 Paul B Mahol
5
*
6
* This file is part of FFmpeg.
7
*
8
* FFmpeg is free software; you can redistribute it and/or
9
* modify it under the terms of the GNU Lesser General Public
10
* License as published by the Free Software Foundation; either
11
* version 2.1 of the License, or (at your option) any later version.
12
*
13
* FFmpeg is distributed in the hope that it will be useful,
14
* but WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* Lesser General Public License for more details.
17
*
18
* You should have received a copy of the GNU Lesser General Public
19
* License along with FFmpeg; if not, write to the Free Software
20
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
*/
22
23
#include "
libavutil/attributes.h
"
24
25
#include "
apetag.h
"
26
#include "
avformat.h
"
27
#include "
wv.h
"
28
29
typedef
struct
WvMuxContext
{
30
int64_t
samples
;
31
}
WvMuxContext
;
32
33
static
av_cold
int
wv_write_header
(
AVFormatContext
*ctx)
34
{
35
if
(ctx->
nb_streams
> 1 ||
36
ctx->
streams
[0]->
codec
->
codec_id
!=
AV_CODEC_ID_WAVPACK
) {
37
av_log
(ctx,
AV_LOG_ERROR
,
"This muxer only supports a single WavPack stream.\n"
);
38
return
AVERROR
(EINVAL);
39
}
40
41
return
0;
42
}
43
44
static
int
wv_write_packet
(
AVFormatContext
*ctx,
AVPacket
*
pkt
)
45
{
46
WvMuxContext
*
s
= ctx->
priv_data
;
47
WvHeader
header
;
48
int
ret
;
49
50
if
(pkt->
size
<
WV_HEADER_SIZE
||
51
(ret =
ff_wv_parse_header
(&header, pkt->
data
)) < 0) {
52
av_log
(ctx,
AV_LOG_ERROR
,
"Invalid WavPack packet.\n"
);
53
return
AVERROR
(EINVAL);
54
}
55
s->
samples
+= header.
samples
;
56
57
avio_write
(ctx->
pb
, pkt->
data
, pkt->
size
);
58
59
return
0;
60
}
61
62
static
av_cold
int
wv_write_trailer
(
AVFormatContext
*ctx)
63
{
64
WvMuxContext
*
s
= ctx->
priv_data
;
65
66
/* update total number of samples in the first block */
67
if
(ctx->
pb
->
seekable
&& s->
samples
&&
68
s->
samples
< UINT32_MAX) {
69
int64_t pos =
avio_tell
(ctx->
pb
);
70
avio_seek
(ctx->
pb
, 12, SEEK_SET);
71
avio_wl32
(ctx->
pb
, s->
samples
);
72
avio_seek
(ctx->
pb
, pos, SEEK_SET);
73
}
74
75
ff_ape_write_tag
(ctx);
76
return
0;
77
}
78
79
AVOutputFormat
ff_wv_muxer
= {
80
.
name
=
"wv"
,
81
.long_name =
NULL_IF_CONFIG_SMALL
(
"raw WavPack"
),
82
.mime_type =
"audio/x-wavpack"
,
83
.extensions =
"wv"
,
84
.priv_data_size =
sizeof
(
WvMuxContext
),
85
.audio_codec =
AV_CODEC_ID_WAVPACK
,
86
.video_codec =
AV_CODEC_ID_NONE
,
87
.
write_header
=
wv_write_header
,
88
.
write_packet
=
wv_write_packet
,
89
.
write_trailer
=
wv_write_trailer
,
90
.
flags
=
AVFMT_NOTIMESTAMPS
,
91
};
Generated on Sun Mar 23 2014 23:50:14 for FFmpeg by
1.8.2