mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
2.5 KiB
93 lines
2.5 KiB
/* |
|
* RV30/40 parser |
|
* Copyright (c) 2011 Konstantin Shishkov |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
/** |
|
* @file |
|
* RV30/40 parser |
|
*/ |
|
|
|
#include "parser.h" |
|
#include "libavutil/intreadwrite.h" |
|
|
|
typedef struct { |
|
ParseContext pc; |
|
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; |
|
} |
|
|
|
#if CONFIG_RV30_PARSER |
|
AVCodecParser ff_rv30_parser = { |
|
.codec_ids = { AV_CODEC_ID_RV30 }, |
|
.priv_data_size = sizeof(RV34ParseContext), |
|
.parser_parse = rv34_parse, |
|
}; |
|
#endif |
|
|
|
#if CONFIG_RV40_PARSER |
|
AVCodecParser ff_rv40_parser = { |
|
.codec_ids = { AV_CODEC_ID_RV40 }, |
|
.priv_data_size = sizeof(RV34ParseContext), |
|
.parser_parse = rv34_parse, |
|
}; |
|
#endif
|
|
|