/* (C) 2007-2008 Jean-Marc Valin, CSIRO

*/

/**

   @file vq.h

   @brief Vector quantisation of the residual

 */

/*

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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_t *X, celt_mask_t *W, int N, int K, celt_norm_t *P, ec_enc *enc);

/** 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_t *X, int N, int K, celt_norm_t *P, ec_dec *dec);

void renormalise_vector(celt_norm_t *X, celt_word16_t value, int N, int stride);

/** Intra-frame predictor that matches a section of the current frame (at lower

 * frequencies) to encode the current band.

 * @param x Residual signal to quantise/encode (returns quantised version)

 * @param W Perceptual weight

 * @param N Number of samples to encode

 * @param K Number of pulses to use

 * @param Y Lower frequency spectrum to use, normalised to the same standard deviation

 * @param P Pitch vector (it is assumed that p+x is a unit vector)

 * @param B Stride (number of channels multiplied by the number of MDCTs per frame)

 * @param N0 Number of valid offsets

 */

void intra_fold(const CELTMode *m, celt_norm_t * restrict x, int N, int K, celt_norm_t *Y, celt_norm_t * restrict P, int N0, int B);

#endif /* VQ_H */