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); 49
