1/* 2 * VP5/6/8 decoder 3 * Copyright (c) 2010 Jason Garrett-Glaser <darkshikari@gmail.com> 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 25const 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 40void 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} 48