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