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vp8: Return stream format information from parser

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This commit is contained in:
Mark Thompson 2016-10-27 20:02:29 +01:00
parent b6582b2927
commit 182cf170a5
1 changed files with 44 additions and 5 deletions
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49
libavcodec/vp8_parser.c
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@ -1,6 +1,4 @@
/*
* Copyright (C) 2008 Michael Niedermayer
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
@ -18,15 +16,56 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "parser.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
static int parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
s->pict_type = (buf[0] & 0x01) ? AV_PICTURE_TYPE_P
: AV_PICTURE_TYPE_I;
unsigned int frame_type;
unsigned int profile;
if (buf_size < 3)
return AVERROR_INVALIDDATA;
frame_type = buf[0] & 1;
profile = (buf[0] >> 1) & 7;
if (profile > 3) {
av_log(avctx, AV_LOG_ERROR, "Invalid profile %u.\n", profile);
return AVERROR_INVALIDDATA;
}
avctx->profile = profile;
s->key_frame = frame_type == 0;
s->pict_type = frame_type ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
s->format = AV_PIX_FMT_YUV420P;
s->field_order = AV_FIELD_PROGRESSIVE;
s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
if (frame_type == 0) {
unsigned int sync_code;
unsigned int width, height;
if (buf_size < 10)
return AVERROR_INVALIDDATA;
sync_code = AV_RL24(buf + 3);
if (sync_code != 0x2a019d) {
av_log(avctx, AV_LOG_ERROR, "Invalid sync code %06x.\n", sync_code);
return AVERROR_INVALIDDATA;
}
width = AV_RL16(buf + 6) & 0x3fff;
height = AV_RL16(buf + 8) & 0x3fff;
s->width = width;
s->height = height;
s->coded_width = FFALIGN(width, 16);
s->coded_height = FFALIGN(height, 16);
}
*poutbuf = buf;
*poutbuf_size = buf_size;