mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
|
|
* VP9 compatible video decoder
|
|
*
|
|
* Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
|
|
* Copyright (C) 2013 Clément Bœsch <u pkh me>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavcodec/get_bits.h"
|
|
#include "parser.h"
|
|
|
|
static int parse(AVCodecParserContext *ctx,
|
|
AVCodecContext *avctx,
|
|
const uint8_t **out_data, int *out_size,
|
|
const uint8_t *data, int size)
|
|
{
|
|
GetBitContext gb;
|
|
int res, profile, keyframe;
|
|
|
|
*out_data = data;
|
|
*out_size = size;
|
|
|
|
if (!size || (res = init_get_bits8(&gb, data, size)) < 0)
|
|
return size; // parsers can't return errors
|
|
get_bits(&gb, 2); // frame marker
|
|
profile = get_bits1(&gb);
|
|
profile |= get_bits1(&gb) << 1;
|
|
if (profile == 3) profile += get_bits1(&gb);
|
|
if (profile > 3)
|
|
return size;
|
|
|
|
avctx->profile = profile;
|
|
|
|
if (get_bits1(&gb)) {
|
|
keyframe = 0;
|
|
} else {
|
|
keyframe = !get_bits1(&gb);
|
|
}
|
|
|
|
if (!keyframe) {
|
|
ctx->pict_type = AV_PICTURE_TYPE_P;
|
|
ctx->key_frame = 0;
|
|
} else {
|
|
ctx->pict_type = AV_PICTURE_TYPE_I;
|
|
ctx->key_frame = 1;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
AVCodecParser ff_vp9_parser = {
|
|
.codec_ids = { AV_CODEC_ID_VP9 },
|
|
.parser_parse = parse,
|
|
};
|