| 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 | 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 | } |