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ffmpeg / libavcodec / vp56rac.c @ 2912e87a

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/*
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 * VP5/6/8 decoder
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 * Copyright (c) 2010 Jason Garrett-Glaser <darkshikari@gmail.com>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/common.h"
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#include "vp56.h"
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const uint8_t ff_vp56_norm_shift[256]= {
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 8,7,6,6,5,5,5,5,4,4,4,4,4,4,4,4,
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 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,
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 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
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 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
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 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,
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 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,
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 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,
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 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,
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};
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void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
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{
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    c->high = 255;
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    c->bits = -16;
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    c->buffer = buf;
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    c->end = buf + buf_size;
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    c->code_word = bytestream_get_be24(&c->buffer);
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}