FFmpeg
libavcodec
vp9_parser.c
Go to the documentation of this file.
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/*
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* VP9 compatible video decoder
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*
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* Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
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* Copyright (C) 2013 Clément Bœsch <u pkh me>
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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 "
libavcodec/get_bits.h
"
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#include "
parser.h
"
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static
int
parse
(
AVCodecParserContext
*
ctx
,
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AVCodecContext
*avctx,
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const
uint8_t **out_data,
int
*
out_size
,
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const
uint8_t *
data
,
int
size
)
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{
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GetBitContext
gb;
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int
res,
profile
, keyframe;
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*out_data =
data
;
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*
out_size
=
size
;
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if
(!
size
|| (res =
init_get_bits8
(&gb,
data
,
size
)) < 0)
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return
size
;
// parsers can't return errors
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get_bits
(&gb, 2);
// frame marker
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profile
=
get_bits1
(&gb);
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profile
|=
get_bits1
(&gb) << 1;
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if
(
profile
== 3)
profile
+=
get_bits1
(&gb);
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if
(
profile
> 3)
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return
size
;
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avctx->
profile
=
profile
;
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if
(
get_bits1
(&gb)) {
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keyframe = 0;
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}
else
{
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keyframe = !
get_bits1
(&gb);
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}
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if
(!keyframe) {
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ctx
->pict_type =
AV_PICTURE_TYPE_P
;
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ctx
->key_frame = 0;
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}
else
{
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ctx
->pict_type =
AV_PICTURE_TYPE_I
;
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ctx
->key_frame = 1;
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}
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return
size
;
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}
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const
AVCodecParser
ff_vp9_parser
= {
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.
codec_ids
= {
AV_CODEC_ID_VP9
},
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.parser_parse =
parse
,
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};
parse
static int parse(AVCodecParserContext *ctx, AVCodecContext *avctx, const uint8_t **out_data, int *out_size, const uint8_t *data, int size)
Definition:
vp9_parser.c:28
out_size
int out_size
Definition:
movenc.c:56
data
const char data[16]
Definition:
mxf.c:148
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition:
get_bits.h:335
GetBitContext
Definition:
get_bits.h:108
init_get_bits8
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition:
get_bits.h:545
intreadwrite.h
AV_CODEC_ID_VP9
@ AV_CODEC_ID_VP9
Definition:
codec_id.h:220
ctx
AVFormatContext * ctx
Definition:
movenc.c:49
get_bits.h
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition:
avutil.h:279
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition:
get_bits.h:388
AVCodecParser::codec_ids
int codec_ids[7]
Definition:
avcodec.h:2908
size
int size
Definition:
twinvq_data.h:10344
parser.h
profile
int profile
Definition:
mxfenc.c:2228
AVCodecParserContext
Definition:
avcodec.h:2748
ff_vp9_parser
const AVCodecParser ff_vp9_parser
Definition:
vp9_parser.c:67
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
AVCodecParser
Definition:
avcodec.h:2907
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