mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/*
|
|
* VP5/6/8 decoder
|
|
* Copyright (c) 2010 Jason Garrett-Glaser <darkshikari@gmail.com>
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/common.h"
|
|
#include "vp56.h"
|
|
|
|
const uint8_t ff_vp56_norm_shift[256]= {
|
|
8,7,6,6,5,5,5,5,4,4,4,4,4,4,4,4,
|
|
3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
|
|
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
|
|
};
|
|
|
|
void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
|
|
{
|
|
c->high = 255;
|
|
c->bits = -16;
|
|
c->buffer = buf;
|
|
c->end = buf + buf_size;
|
|
c->code_word = bytestream_get_be24(&c->buffer);
|
|
}
|