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libavformat
filmstripenc.c
Go to the documentation of this file.
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/*
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* Adobe Filmstrip muxer
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* Copyright (c) 2010 Peter Ross
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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27
#include "
libavutil/intreadwrite.h
"
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#include "
avformat.h
"
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#define RAND_TAG MKBETAG('R','a','n','d')
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typedef
struct
{
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int
nb_frames
;
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}
FilmstripMuxContext
;
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static
int
write_header
(
AVFormatContext
*s)
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{
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if
(s->
streams
[0]->
codec
->
pix_fmt
!=
PIX_FMT_RGBA
) {
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av_log
(s,
AV_LOG_ERROR
,
"only PIX_FMT_RGBA is supported\n"
);
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return
AVERROR_INVALIDDATA
;
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}
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return
0;
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}
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static
int
write_packet
(
AVFormatContext
*s,
AVPacket
*pkt)
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{
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FilmstripMuxContext
*film = s->
priv_data
;
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avio_write
(s->
pb
, pkt->
data
, pkt->
size
);
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film->
nb_frames
++;
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return
0;
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}
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static
int
write_trailer
(
AVFormatContext
*s)
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{
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FilmstripMuxContext
*film = s->
priv_data
;
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AVIOContext
*pb = s->
pb
;
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AVStream
*st = s->
streams
[0];
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int
i;
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avio_wb32
(pb,
RAND_TAG
);
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avio_wb32
(pb, film->
nb_frames
);
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avio_wb16
(pb, 0);
// packing method
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avio_wb16
(pb, 0);
// reserved
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avio_wb16
(pb, st->
codec
->
width
);
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avio_wb16
(pb, st->
codec
->
height
);
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avio_wb16
(pb, 0);
// leading
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avio_wb16
(pb, 1/
av_q2d
(st->
codec
->
time_base
));
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for
(i = 0; i < 16; i++)
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avio_w8
(pb, 0x00);
// reserved
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avio_flush
(pb);
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return
0;
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}
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AVOutputFormat
ff_filmstrip_muxer
= {
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.
name
=
"filmstrip"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"Adobe Filmstrip"
),
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.extensions =
"flm"
,
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.priv_data_size =
sizeof
(
FilmstripMuxContext
),
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.audio_codec =
CODEC_ID_NONE
,
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.video_codec =
CODEC_ID_RAWVIDEO
,
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.
write_header
=
write_header
,
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.
write_packet
=
write_packet
,
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.
write_trailer
=
write_trailer
,
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};
AVCodecContext::pix_fmt
enum PixelFormat pix_fmt
Pixel format, see PIX_FMT_xxx.
Definition:
avcodec.h:1426
AVIOContext
Bytestream IO Context.
Definition:
avio.h:68
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition:
error.h:54
AVPacket::size
int size
Definition:
avcodec.h:909
CODEC_ID_RAWVIDEO
Definition:
avcodec.h:100
write_trailer
static int write_trailer(AVFormatContext *s)
Definition:
filmstripenc.c:53
AVCodecContext::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition:
avcodec.h:1398
AVFormatContext
Format I/O context.
Definition:
avformat.h:863
FilmstripMuxContext::nb_frames
int nb_frames
Definition:
filmstripenc.c:33
ff_filmstrip_muxer
AVOutputFormat ff_filmstrip_muxer
Definition:
filmstripenc.c:74
AVFormatContext::streams
AVStream ** streams
Definition:
avformat.h:908
av_q2d
static double av_q2d(AVRational a)
Convert rational to double.
Definition:
rational.h:69
AVPacket::data
uint8_t * data
Definition:
avcodec.h:908
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition:
aviobuf.c:190
FilmstripMuxContext
Definition:
filmstripenc.c:32
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:191
av_log
void av_log(void *avcl, int level, const char *fmt,...)
Definition:
log.c:140
AVStream::codec
AVCodecContext * codec
codec context
Definition:
avformat.h:623
avio_flush
int void avio_flush(AVIOContext *s)
Definition:
aviobuf.c:205
intreadwrite.h
AVCodecContext::width
int width
picture width / height.
Definition:
avcodec.h:1408
AVOutputFormat::name
const char * name
Definition:
avformat.h:390
AVCodecContext::height
int height
Definition:
avcodec.h:1408
AVStream
Stream structure.
Definition:
avformat.h:620
AVFormatContext::pb
AVIOContext * pb
Definition:
avformat.h:896
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition:
aviobuf.c:169
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:111
write_packet
static int write_packet(AVFormatContext *s, AVPacket *pkt)
Definition:
filmstripenc.c:45
avio_wb16
void avio_wb16(AVIOContext *s, unsigned int val)
Definition:
aviobuf.c:533
RAND_TAG
#define RAND_TAG
Definition:
filmstripenc.c:30
avformat.h
Main libavformat public API header.
AVOutputFormat
Definition:
avformat.h:389
CODEC_ID_NONE
Definition:
avcodec.h:84
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition:
avformat.h:883
avio_wb32
void avio_wb32(AVIOContext *s, unsigned int val)
Definition:
aviobuf.c:324
PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition:
pixfmt.h:93
AVPacket
Definition:
avcodec.h:891
write_header
static int write_header(AVFormatContext *s)
Definition:
filmstripenc.c:36