/* (C) 2007 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"
/** 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 alpha compression factor to apply in the pitch direction (magic!)
* @param enc Entropy encoder state
*/
void alg_quant(celt_norm_t *X, celt_mask_t *W, int N, int K, celt_norm_t *P, float alpha, 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 alpha compression factor in the pitch direction (magic!)
* @param dec Entropy decoder state
*/
void alg_unquant(celt_norm_t *X, int N, int K, celt_norm_t *P, float alpha, ec_dec *dec);
/** 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
* @param enc Entropy encoder state
*/
void intra_prediction(celt_norm_t *x, celt_mask_t *W, int N, int K, celt_norm_t *Y, celt_norm_t *P, int B, int N0, ec_enc *enc);
void intra_unquant(celt_norm_t *x, int N, int K, celt_norm_t *Y, celt_norm_t *P, int B, int N0, ec_dec *dec);
/** Encode the entire band as a "fold" from other parts of the spectrum. No bits required (only use is case of an emergency!) */
void intra_fold(celt_norm_t *x, int N, celt_norm_t *Y, celt_norm_t *P, int B, int N0, int Nmax);
#endif /* VQ_H */