Libav
Main Page
Related Pages
Modules
Data Structures
Files
Examples
File List
Globals
libavformat
ivfenc.c
Go to the documentation of this file.
1
/*
2
* Copyright (c) 2010 Reimar Döffinger
3
*
4
* This file is part of Libav.
5
*
6
* Libav is free software; you can redistribute it and/or
7
* modify it under the terms of the GNU Lesser General Public
8
* License as published by the Free Software Foundation; either
9
* version 2.1 of the License, or (at your option) any later version.
10
*
11
* Libav is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
* Lesser General Public License for more details.
15
*
16
* You should have received a copy of the GNU Lesser General Public
17
* License along with Libav; if not, write to the Free Software
18
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
*/
20
#include "
avformat.h
"
21
#include "
libavutil/intreadwrite.h
"
22
23
static
int
ivf_write_header
(
AVFormatContext
*s)
24
{
25
AVCodecContext
*ctx;
26
AVIOContext
*pb = s->
pb
;
27
28
if
(s->
nb_streams
!= 1) {
29
av_log
(s,
AV_LOG_ERROR
,
"Format supports only exactly one video stream\n"
);
30
return
AVERROR
(EINVAL);
31
}
32
ctx = s->
streams
[0]->
codec
;
33
if
(ctx->
codec_type
!=
AVMEDIA_TYPE_VIDEO
|| ctx->
codec_id
!=
AV_CODEC_ID_VP8
) {
34
av_log
(s,
AV_LOG_ERROR
,
"Currently only VP8 is supported!\n"
);
35
return
AVERROR
(EINVAL);
36
}
37
avio_write
(pb,
"DKIF"
, 4);
38
avio_wl16
(pb, 0);
// version
39
avio_wl16
(pb, 32);
// header length
40
avio_wl32
(pb, ctx->
codec_tag
? ctx->
codec_tag
:
AV_RL32
(
"VP80"
));
41
avio_wl16
(pb, ctx->
width
);
42
avio_wl16
(pb, ctx->
height
);
43
avio_wl32
(pb, s->
streams
[0]->
time_base
.
den
);
44
avio_wl32
(pb, s->
streams
[0]->
time_base
.
num
);
45
avio_wl64
(pb, s->
streams
[0]->
duration
);
// TODO: duration or number of frames?!?
46
47
return
0;
48
}
49
50
static
int
ivf_write_packet
(
AVFormatContext
*s,
AVPacket
*pkt)
51
{
52
AVIOContext
*pb = s->
pb
;
53
avio_wl32
(pb, pkt->
size
);
54
avio_wl64
(pb, pkt->
pts
);
55
avio_write
(pb, pkt->
data
, pkt->
size
);
56
57
return
0;
58
}
59
60
AVOutputFormat
ff_ivf_muxer
= {
61
.
name
=
"ivf"
,
62
.long_name =
NULL_IF_CONFIG_SMALL
(
"On2 IVF"
),
63
.extensions =
"ivf"
,
64
.audio_codec =
AV_CODEC_ID_NONE
,
65
.video_codec =
AV_CODEC_ID_VP8
,
66
.write_header =
ivf_write_header
,
67
.write_packet =
ivf_write_packet
,
68
};
avio_wl16
void avio_wl16(AVIOContext *s, unsigned int val)
Definition:
aviobuf.c:336
AVIOContext
Bytestream IO Context.
Definition:
avio.h:68
AV_CODEC_ID_NONE
Definition:
avcodec.h:106
ivf_write_header
static int ivf_write_header(AVFormatContext *s)
Definition:
ivfenc.c:23
AVRational::num
int num
numerator
Definition:
rational.h:44
AVPacket::size
int size
Definition:
avcodec.h:974
ff_ivf_muxer
AVOutputFormat ff_ivf_muxer
Definition:
ivfenc.c:60
ivf_write_packet
static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition:
ivfenc.c:50
AVFormatContext
Format I/O context.
Definition:
avformat.h:922
avio_wl32
void avio_wl32(AVIOContext *s, unsigned int val)
Definition:
aviobuf.c:260
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition:
avformat.h:990
AVPacket::data
uint8_t * data
Definition:
avcodec.h:973
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition:
aviobuf.c:165
avio_wl64
void avio_wl64(AVIOContext *s, uint64_t val)
Definition:
aviobuf.c:324
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:123
AVERROR
#define AVERROR(e)
Definition:
error.h:43
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:150
av_log
void av_log(void *avcl, int level, const char *fmt,...)
Definition:
log.c:169
AVStream::codec
AVCodecContext * codec
Codec context associated with this stream.
Definition:
avformat.h:718
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition:
avformat.h:978
intreadwrite.h
AVCodecContext::width
int width
picture width / height.
Definition:
avcodec.h:1224
AVOutputFormat::name
const char * name
Definition:
avformat.h:446
AV_RL32
#define AV_RL32
Definition:
intreadwrite.h:146
AV_CODEC_ID_VP8
Definition:
avcodec.h:251
AVCodecContext::height
int height
Definition:
avcodec.h:1224
AVCodecContext::codec_type
enum AVMediaType codec_type
Definition:
avcodec.h:1058
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition:
avcodec.h:1067
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition:
avformat.h:964
AVCodecContext
main external API structure.
Definition:
avcodec.h:1050
AVCodecContext::codec_tag
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition:
avcodec.h:1082
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition:
avformat.h:756
avformat.h
Main libavformat public API header.
AVOutputFormat
Definition:
avformat.h:445
AVRational::den
int den
denominator
Definition:
rational.h:45
AVMEDIA_TYPE_VIDEO
Definition:
avutil.h:187
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition:
avformat.h:741
AVPacket
This structure stores compressed data.
Definition:
avcodec.h:950
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition:
avcodec.h:966
Generated on Wed May 13 2015 03:54:22 for Libav by
1.8.9.1