blob: e70302bf856da9771830ff5fcc64f2891613461c
1 | /* |
2 | * VP5/6/8 decoder |
3 | * Copyright (c) 2010 Fiona Glaser <fiona@x264.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 | |
25 | const uint8_t ff_vp56_norm_shift[256]= { |
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 | int 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 | if (buf_size < 1) |
47 | return AVERROR_INVALIDDATA; |
48 | c->code_word = bytestream_get_be24(&c->buffer); |
49 | return 0; |
50 | } |
51 |