shithub: opus

ref: 2dd3d3258ab7b3acaccde06f384cd66572bd7e39
dir: /libcelt/vq.h/

/* (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);

celt_word16_t 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 */