57 lines
2.5 KiB
C
57 lines
2.5 KiB
C
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/* Copyright (c) 2001-2008 Timothy B. Terriberry
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Copyright (c) 2008-2009 Xiph.Org Foundation */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#if !defined(_mfrngcode_H)
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# define _mfrngcode_H (1)
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# include "entcode.h"
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/*Constants used by the entropy encoder/decoder.*/
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/*The number of bits to output at a time.*/
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# define EC_SYM_BITS (8)
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/*The total number of bits in each of the state registers.*/
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# define EC_CODE_BITS (32)
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/*The maximum symbol value.*/
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# define EC_SYM_MAX ((1U<<EC_SYM_BITS)-1)
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/*Bits to shift by to move a symbol into the high-order position.*/
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# define EC_CODE_SHIFT (EC_CODE_BITS-EC_SYM_BITS-1)
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/*Carry bit of the high-order range symbol.*/
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# define EC_CODE_TOP (((ec_uint32)1U)<<EC_CODE_BITS-1)
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/*Low-order bit of the high-order range symbol.*/
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# define EC_CODE_BOT (EC_CODE_TOP>>EC_SYM_BITS)
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/*Code for which propagating carries are possible.*/
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# define EC_CODE_CARRY (((ec_uint32)EC_SYM_MAX)<<EC_CODE_SHIFT)
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/*The number of bits available for the last, partial symbol in the code field.*/
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# define EC_CODE_EXTRA ((EC_CODE_BITS-2)%EC_SYM_BITS+1)
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/*A mask for the bits available in the coding buffer.
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This allows different platforms to use a variable with more bits, if it is
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convenient.
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We will only use EC_CODE_BITS of it.*/
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# define EC_CODE_MASK ((((ec_uint32)1U)<<EC_CODE_BITS-1)-1<<1|1)
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#endif
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