FFmpeg
libavcodec
vp8_parser.c
Go to the documentation of this file.
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "
libavutil/intreadwrite.h
"
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#include "
avcodec.h
"
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static
int
parse
(
AVCodecParserContext
*
s
,
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AVCodecContext
*avctx,
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const
uint8_t **poutbuf,
int
*poutbuf_size,
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const
uint8_t *buf,
int
buf_size)
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{
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unsigned
int
frame_type
;
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unsigned
int
profile
;
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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if
(buf_size < 3)
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return
buf_size;
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frame_type
= buf[0] & 1;
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profile
= (buf[0] >> 1) & 7;
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if
(
profile
> 3) {
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av_log
(avctx,
AV_LOG_ERROR
,
"Invalid profile %u.\n"
,
profile
);
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return
buf_size;
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}
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avctx->
profile
=
profile
;
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s
->key_frame =
frame_type
== 0;
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s
->pict_type =
frame_type
?
AV_PICTURE_TYPE_P
:
AV_PICTURE_TYPE_I
;
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s
->format =
AV_PIX_FMT_YUV420P
;
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s
->field_order =
AV_FIELD_PROGRESSIVE
;
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s
->picture_structure =
AV_PICTURE_STRUCTURE_FRAME
;
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if
(
frame_type
== 0) {
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unsigned
int
sync_code;
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unsigned
int
width
,
height
;
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if
(buf_size < 10)
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return
buf_size;
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sync_code =
AV_RL24
(buf + 3);
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if
(sync_code != 0x2a019d) {
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av_log
(avctx,
AV_LOG_ERROR
,
"Invalid sync code %06x.\n"
, sync_code);
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return
buf_size;
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}
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width
=
AV_RL16
(buf + 6) & 0x3fff;
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height
=
AV_RL16
(buf + 8) & 0x3fff;
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s
->width =
width
;
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s
->height =
height
;
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s
->coded_width =
FFALIGN
(
width
, 16);
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s
->coded_height =
FFALIGN
(
height
, 16);
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}
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return
buf_size;
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}
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const
AVCodecParser
ff_vp8_parser
= {
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.
codec_ids
= {
AV_CODEC_ID_VP8
},
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.parser_parse =
parse
,
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};
AV_FIELD_PROGRESSIVE
@ AV_FIELD_PROGRESSIVE
Definition:
defs.h:202
parse
static int parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition:
vp8_parser.c:23
AV_PICTURE_STRUCTURE_FRAME
@ AV_PICTURE_STRUCTURE_FRAME
coded as frame
Definition:
avcodec.h:2745
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:209
intreadwrite.h
s
#define s(width, name)
Definition:
cbs_vp9.c:198
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition:
bytestream.h:94
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition:
pixfmt.h:73
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition:
avutil.h:279
height
#define height
Definition:
dsp.h:85
AVCodecParser::codec_ids
int codec_ids[7]
Definition:
avcodec.h:2908
AV_RL24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_RL24
Definition:
bytestream.h:93
frame_type
frame_type
Definition:
jpeg2000_parser.c:31
profile
int profile
Definition:
mxfenc.c:2228
avcodec.h
AVCodecParserContext
Definition:
avcodec.h:2748
AVCodecContext
main external API structure.
Definition:
avcodec.h:451
AVCodecContext::profile
int profile
profile
Definition:
avcodec.h:1650
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition:
avutil.h:280
FFALIGN
#define FFALIGN(x, a)
Definition:
macros.h:78
ff_vp8_parser
const AVCodecParser ff_vp8_parser
Definition:
vp8_parser.c:76
AVCodecParser
Definition:
avcodec.h:2907
AV_CODEC_ID_VP8
@ AV_CODEC_ID_VP8
Definition:
codec_id.h:192
av_log
#define av_log(a,...)
Definition:
tableprint_vlc.h:27
width
#define width
Definition:
dsp.h:85
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