71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
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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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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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};
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