laplace.h (2349B)
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 #ifndef LAPLACE_H 30 #define LAPLACE_H 31 32 #include "entenc.h" 33 #include "entdec.h" 34 35 /** Encode a value that is assumed to be the realisation of a 36 Laplace-distributed random process 37 @param enc Entropy encoder state 38 @param value Value to encode 39 @param fs Probability of 0, multiplied by 32768 40 @param decay Probability of the value +/- 1, multiplied by 16384 41 */ 42 void ec_laplace_encode(ec_enc *enc, int *value, unsigned fs, int decay); 43 44 /** Decode a value that is assumed to be the realisation of a 45 Laplace-distributed random process 46 @param dec Entropy decoder state 47 @param fs Probability of 0, multiplied by 32768 48 @param decay Probability of the value +/- 1, multiplied by 16384 49 @return Value decoded 50 */ 51 int ec_laplace_decode(ec_dec *dec, unsigned fs, int decay); 52 53 54 int ec_laplace_decode_p0(ec_dec *dec, opus_uint16 p0, opus_uint16 decay); 55 void ec_laplace_encode_p0(ec_enc *enc, int value, opus_uint16 p0, opus_uint16 decay); 56 57 #endif