FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vp56rac.c
Go to the documentation of this file.
1 /*
2  * VP5/6/8 decoder
3  * Copyright (c) 2010 Jason Garrett-Glaser <darkshikari@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/common.h"
23 #include "vp56.h"
24 
26  8,7,6,6,5,5,5,5,4,4,4,4,4,4,4,4,
27  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
28  2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
29  2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
30  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
31  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
32  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
33  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
34  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,
35  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,
36  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,
37  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,
38 };
39 
40 void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
41 {
42  c->high = 255;
43  c->bits = -16;
44  c->buffer = buf;
45  c->end = buf + buf_size;
46  c->code_word = bytestream_get_be24(&c->buffer);
47 }