1 /* Copyright (c) 2001-2008 Timothy B. Terriberry 2 Copyright (c) 2008-2009 Xiph.Org Foundation */ 3 /* 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions 6 are met: 7 8 - Redistributions of source code must retain the above copyright 9 notice, this list of conditions and the following disclaimer. 10 11 - Redistributions in binary form must reproduce the above copyright 12 notice, this list of conditions and the following disclaimer in the 13 documentation and/or other materials provided with the distribution. 14 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 19 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 22 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 23 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 24 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #if !defined(_mfrngcode_H) 29 # define _mfrngcode_H (1) 30 # include "entcode.h" 31 32 /*Constants used by the entropy encoder/decoder.*/ 33 34 /*The number of bits to output at a time.*/ 35 # define EC_SYM_BITS (8) 36 /*The total number of bits in each of the state registers.*/ 37 # define EC_CODE_BITS (32) 38 /*The maximum symbol value.*/ 39 # define EC_SYM_MAX ((1U<<EC_SYM_BITS)-1) 40 /*Bits to shift by to move a symbol into the high-order position.*/ 41 # define EC_CODE_SHIFT (EC_CODE_BITS-EC_SYM_BITS-1) 42 /*Carry bit of the high-order range symbol.*/ 43 # define EC_CODE_TOP (((opus_uint32)1U)<<(EC_CODE_BITS-1)) 44 /*Low-order bit of the high-order range symbol.*/ 45 # define EC_CODE_BOT (EC_CODE_TOP>>EC_SYM_BITS) 46 /*The number of bits available for the last, partial symbol in the code field.*/ 47 # define EC_CODE_EXTRA ((EC_CODE_BITS-2)%EC_SYM_BITS+1) 48 #endif 49