libcelt/vq.h

/* Copyright (c) 2007-2008 CSIRO
   Copyright (c) 2007-2009 Xiph.Org Foundation
   Written by Jean-Marc Valin */
/**
   @file vq.h
   @brief Vector quantisation of the residual
 */
/*
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   modification, are permitted provided that the following conditions
   are met:
   
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   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
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   - Neither the name of the Xiph.org Foundation nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.
   
   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 FOUNDATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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*/

#ifndef VQ_H
#define VQ_H

#include "entenc.h"
#include "entdec.h"
#include "modes.h"

/** Algebraic pulse-vector quantiser. The signal x is replaced by the sum of 
  * the pitch and a combination of pulses such that its norm is still equal 
  * to 1. This is the function that will typically require the most CPU. 
 * @param x Residual signal to quantise/encode (returns quantised version)
 * @param W Perceptual weight to use when optimising (currently unused)
 * @param N Number of samples to encode
 * @param K Number of pulses to use
 * @param p Pitch vector (it is assumed that p+x is a unit vector)
 * @param enc Entropy encoder state
*/
void alg_quant(celt_norm *X, int N, int K, int spread, int B, celt_norm *lowband,
      int resynth, ec_enc *enc, celt_int32 *seed, celt_word16 gain);

/** Algebraic pulse decoder
 * @param x Decoded normalised spectrum (returned)
 * @param N Number of samples to decode
 * @param K Number of pulses to use
 * @param p Pitch vector (automatically added to x)
 * @param dec Entropy decoder state
 */
void alg_unquant(celt_norm *X, int N, int K, int spread, int B,
      celt_norm *lowband, ec_dec *dec, celt_int32 *seed, celt_word16 gain);

void renormalise_vector(celt_norm *X, int N, celt_word16 gain);

celt_word16 vector_norm(const celt_norm *X, int N);

#endif /* VQ_H */