Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 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 |