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1 /* Copyright (c) 2001-2008 Timothy B. Terriberry
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2 Copyright (c) 2008-2009 Xiph.Org Foundation */
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3 /*
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4 Redistribution and use in source and binary forms, with or without
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5 modification, are permitted provided that the following conditions
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6 are met:
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7
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8 - Redistributions of source code must retain the above copyright
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9 notice, this list of conditions and the following disclaimer.
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10
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11 - Redistributions in binary form must reproduce the above copyright
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12 notice, this list of conditions and the following disclaimer in the
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13 documentation and/or other materials provided with the distribution.
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14
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15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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16 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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17 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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18 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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19 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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23 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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24 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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25 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 */
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27
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28 #if !defined(_mfrngcode_H)
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29 # define _mfrngcode_H (1)
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30 # include "entcode.h"
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31
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32 /*Constants used by the entropy encoder/decoder.*/
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33
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34 /*The number of bits to output at a time.*/
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35 # define EC_SYM_BITS (8)
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36 /*The total number of bits in each of the state registers.*/
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37 # define EC_CODE_BITS (32)
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38 /*The maximum symbol value.*/
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39 # define EC_SYM_MAX ((1U<<EC_SYM_BITS)-1)
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40 /*Bits to shift by to move a symbol into the high-order position.*/
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41 # define EC_CODE_SHIFT (EC_CODE_BITS-EC_SYM_BITS-1)
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42 /*Carry bit of the high-order range symbol.*/
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43 # define EC_CODE_TOP (((opus_uint32)1U)<<(EC_CODE_BITS-1))
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44 /*Low-order bit of the high-order range symbol.*/
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45 # define EC_CODE_BOT (EC_CODE_TOP>>EC_SYM_BITS)
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46 /*The number of bits available for the last, partial symbol in the code field.*/
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47 # define EC_CODE_EXTRA ((EC_CODE_BITS-2)%EC_SYM_BITS+1)
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48 #endif
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