Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 1 | /* Copyright (c) 2007 CSIRO |
| 2 | Copyright (c) 2007-2009 Xiph.Org Foundation |
| 3 | Written by Jean-Marc Valin */ |
| 4 | /* |
| 5 | Redistribution and use in source and binary forms, with or without |
| 6 | modification, are permitted provided that the following conditions |
| 7 | are met: |
| 8 | |
| 9 | - Redistributions of source code must retain the above copyright |
| 10 | notice, this list of conditions and the following disclaimer. |
| 11 | |
| 12 | - Redistributions in binary form must reproduce the above copyright |
| 13 | notice, this list of conditions and the following disclaimer in the |
| 14 | documentation and/or other materials provided with the distribution. |
| 15 | |
| 16 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
| 20 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 21 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 22 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 23 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 24 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 25 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 26 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include "entenc.h" |
| 30 | #include "entdec.h" |
| 31 | |
| 32 | /** Encode a value that is assumed to be the realisation of a |
| 33 | Laplace-distributed random process |
| 34 | @param enc Entropy encoder state |
| 35 | @param value Value to encode |
| 36 | @param fs Probability of 0, multiplied by 32768 |
| 37 | @param decay Probability of the value +/- 1, multiplied by 16384 |
| 38 | */ |
| 39 | void ec_laplace_encode(ec_enc *enc, int *value, unsigned fs, int decay); |
| 40 | |
| 41 | /** Decode a value that is assumed to be the realisation of a |
| 42 | Laplace-distributed random process |
| 43 | @param dec Entropy decoder state |
| 44 | @param fs Probability of 0, multiplied by 32768 |
| 45 | @param decay Probability of the value +/- 1, multiplied by 16384 |
| 46 | @return Value decoded |
| 47 | */ |
| 48 | int ec_laplace_decode(ec_dec *dec, unsigned fs, int decay); |