mirror of
https://github.com/FFmpeg/FFmpeg.git
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79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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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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#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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if (buf_size < 3)
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return AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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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 AVERROR_INVALIDDATA;
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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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*poutbuf = buf;
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*poutbuf_size = buf_size;
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return buf_size;
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}
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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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};
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