cannam@154: /* Copyright (c) 2007 CSIRO
cannam@154:    Copyright (c) 2007-2009 Xiph.Org Foundation
cannam@154:    Written by Jean-Marc Valin */
cannam@154: /*
cannam@154:    Redistribution and use in source and binary forms, with or without
cannam@154:    modification, are permitted provided that the following conditions
cannam@154:    are met:
cannam@154: 
cannam@154:    - Redistributions of source code must retain the above copyright
cannam@154:    notice, this list of conditions and the following disclaimer.
cannam@154: 
cannam@154:    - Redistributions in binary form must reproduce the above copyright
cannam@154:    notice, this list of conditions and the following disclaimer in the
cannam@154:    documentation and/or other materials provided with the distribution.
cannam@154: 
cannam@154:    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
cannam@154:    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
cannam@154:    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
cannam@154:    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
cannam@154:    OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
cannam@154:    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
cannam@154:    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
cannam@154:    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
cannam@154:    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
cannam@154:    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
cannam@154:    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
cannam@154: */
cannam@154: 
cannam@154: #include "entenc.h"
cannam@154: #include "entdec.h"
cannam@154: 
cannam@154: /** Encode a value that is assumed to be the realisation of a
cannam@154:     Laplace-distributed random process
cannam@154:  @param enc Entropy encoder state
cannam@154:  @param value Value to encode
cannam@154:  @param fs Probability of 0, multiplied by 32768
cannam@154:  @param decay Probability of the value +/- 1, multiplied by 16384
cannam@154: */
cannam@154: void ec_laplace_encode(ec_enc *enc, int *value, unsigned fs, int decay);
cannam@154: 
cannam@154: /** Decode a value that is assumed to be the realisation of a
cannam@154:     Laplace-distributed random process
cannam@154:  @param dec Entropy decoder state
cannam@154:  @param fs Probability of 0, multiplied by 32768
cannam@154:  @param decay Probability of the value +/- 1, multiplied by 16384
cannam@154:  @return Value decoded
cannam@154:  */
cannam@154: int ec_laplace_decode(ec_dec *dec, unsigned fs, int decay);