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