michael@0: /* Copyright (c) 2007 CSIRO
michael@0:    Copyright (c) 2007-2009 Xiph.Org Foundation
michael@0:    Written by Jean-Marc Valin */
michael@0: /*
michael@0:    Redistribution and use in source and binary forms, with or without
michael@0:    modification, are permitted provided that the following conditions
michael@0:    are met:
michael@0: 
michael@0:    - Redistributions of source code must retain the above copyright
michael@0:    notice, this list of conditions and the following disclaimer.
michael@0: 
michael@0:    - Redistributions in binary form must reproduce the above copyright
michael@0:    notice, this list of conditions and the following disclaimer in the
michael@0:    documentation and/or other materials provided with the distribution.
michael@0: 
michael@0:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
michael@0:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
michael@0:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
michael@0:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
michael@0:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
michael@0:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
michael@0:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
michael@0:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
michael@0:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
michael@0: */
michael@0: 
michael@0: #include "entenc.h"
michael@0: #include "entdec.h"
michael@0: 
michael@0: /** Encode a value that is assumed to be the realisation of a
michael@0:     Laplace-distributed random process
michael@0:  @param enc Entropy encoder state
michael@0:  @param value Value to encode
michael@0:  @param fs Probability of 0, multiplied by 32768
michael@0:  @param decay Probability of the value +/- 1, multiplied by 16384
michael@0: */
michael@0: void ec_laplace_encode(ec_enc *enc, int *value, unsigned fs, int decay);
michael@0: 
michael@0: /** Decode a value that is assumed to be the realisation of a
michael@0:     Laplace-distributed random process
michael@0:  @param dec Entropy decoder state
michael@0:  @param fs Probability of 0, multiplied by 32768
michael@0:  @param decay Probability of the value +/- 1, multiplied by 16384
michael@0:  @return Value decoded
michael@0:  */
michael@0: int ec_laplace_decode(ec_dec *dec, unsigned fs, int decay);