cobalt / cobalt / ac9ac065c5083565917b15e7a672a79599f2f00b / . / src / third_party / opus / celt / laplace.h

/* Copyright (c) 2007 CSIRO | |

Copyright (c) 2007-2009 Xiph.Org Foundation | |

Written by Jean-Marc Valin */ | |

/* | |

Redistribution and use in source and binary forms, with or without | |

modification, are permitted provided that the following conditions | |

are met: | |

- Redistributions of source code must retain the above copyright | |

notice, this list of conditions and the following disclaimer. | |

- Redistributions in binary form must reproduce the above copyright | |

notice, this list of conditions and the following disclaimer in the | |

documentation and/or other materials provided with the distribution. | |

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |

``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | |

OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |

EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |

PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |

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*/ | |

#include "entenc.h" | |

#include "entdec.h" | |

/** Encode a value that is assumed to be the realisation of a | |

Laplace-distributed random process | |

@param enc Entropy encoder state | |

@param value Value to encode | |

@param fs Probability of 0, multiplied by 32768 | |

@param decay Probability of the value +/- 1, multiplied by 16384 | |

*/ | |

void ec_laplace_encode(ec_enc *enc, int *value, unsigned fs, int decay); | |

/** Decode a value that is assumed to be the realisation of a | |

Laplace-distributed random process | |

@param dec Entropy decoder state | |

@param fs Probability of 0, multiplied by 32768 | |

@param decay Probability of the value +/- 1, multiplied by 16384 | |

@return Value decoded | |

*/ | |

int ec_laplace_decode(ec_dec *dec, unsigned fs, int decay); |