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/*
* RV30/40 parser
* Copyright (c) 2011 Konstantin Shishkov
*
* 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
*/
/**
* @file
* RV30/40 parser
*/
#include "avcodec.h"
#include "libavutil/intreadwrite.h"
typedef struct RV34ParseContext {
int64_t key_dts;
int key_pts;
} RV34ParseContext;
static const int rv_to_av_frame_type[4] = {
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B,
};
static int rv34_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
const uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
RV34ParseContext *pc = s->priv_data;
int type, pts, hdr;
if (buf_size < 13 + *buf * 8) {
*poutbuf = buf;
*poutbuf_size = buf_size;
return buf_size;
}
hdr = AV_RB32(buf + 9 + *buf * 8);
if (avctx->codec_id == AV_CODEC_ID_RV30) {
type = (hdr >> 27) & 3;
pts = (hdr >> 7) & 0x1FFF;
} else {
type = (hdr >> 29) & 3;
pts = (hdr >> 6) & 0x1FFF;
}
if (type != 3 && s->pts != AV_NOPTS_VALUE) {
pc->key_dts = s->pts;
pc->key_pts = pts;
} else {
if (type != 3)
s->pts = pc->key_dts + ((pts - pc->key_pts) & 0x1FFF);
else
s->pts = pc->key_dts - ((pc->key_pts - pts) & 0x1FFF);
}
s->pict_type = rv_to_av_frame_type[type];
*poutbuf = buf;
*poutbuf_size = buf_size;
return buf_size;
}
const AVCodecParser ff_rv34_parser = {
.codec_ids = { AV_CODEC_ID_RV30, AV_CODEC_ID_RV40 },
.priv_data_size = sizeof(RV34ParseContext),
.parser_parse = rv34_parse,
};
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