ref: d0f57874ef3c2ca2d6b5cb2a0e3b557ea2868279
dir: /libcelt/bands.h/
/* (C) 2007 Jean-Marc Valin, CSIRO
*/
/*
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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
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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*/
#ifndef BANDS_H
#define BANDS_H
#include "arch.h"
#include "modes.h"
#include "entenc.h"
#include "entdec.h"
#include "rate.h"
/** Applies a series of rotations so that pulses are spread like a two-sided
exponential. The effect of this is to reduce the tonal noise created by the
sparse spectrum resulting from the pulse codebook */
void exp_rotation(celt_norm_t *X, int len, int dir, int stride, int iter);
/** Compute the amplitude (sqrt energy) in each of the bands
* @param m Mode data
* @param X Spectrum
* @param bands Square root of the energy for each band (returned)
*/
void compute_band_energies(const CELTMode *m, const celt_sig_t *X, celt_ener_t *bands);
/** Normalise each band of X such that the energy in each band is
equal to 1
* @param m Mode data
* @param X Spectrum (returned normalised)
* @param bands Square root of the energy for each band
*/
void normalise_bands(const CELTMode *m, const celt_sig_t *freq, celt_norm_t *X, const celt_ener_t *bands);
void renormalise_bands(const CELTMode *m, celt_norm_t *X);
/** Denormalise each band of X to restore full amplitude
* @param m Mode data
* @param X Spectrum (returned de-normalised)
* @param bands Square root of the energy for each band
*/
void denormalise_bands(const CELTMode *m, const celt_norm_t *X, celt_sig_t *freq, const celt_ener_t *bands);
/** Compute the pitch predictor gain for each pitch band
* @param m Mode data
* @param X Spectrum to predict
* @param P Pitch vector (normalised)
* @param gains Gain computed for each pitch band (returned)
* @param bank Square root of the energy for each band
*/
void compute_pitch_gain(const CELTMode *m, const celt_norm_t *X, const celt_norm_t *P, celt_pgain_t *gains);
void pitch_quant_bands(const CELTMode *m, celt_norm_t *P, const celt_pgain_t *gains);
/** Quantisation/encoding of the residual spectrum
* @param m Mode data
* @param X Residual (normalised)
* @param P Pitch vector (normalised)
* @param W Perceptual weighting
* @param total_bits Total number of bits that can be used for the frame (including the ones already spent)
* @param enc Entropy encoder
*/
void quant_bands(const CELTMode *m, celt_norm_t *X, celt_norm_t *P, celt_mask_t *W, int total_bits, ec_enc *enc);
/** Decoding of the residual spectrum
* @param m Mode data
* @param X Residual (normalised)
* @param P Pitch vector (normalised)
* @param total_bits Total number of bits that can be used for the frame (including the ones already spent)
* @param dec Entropy decoder
*/
void unquant_bands(const CELTMode *m, celt_norm_t *X, celt_norm_t *P, int total_bits, ec_dec *dec);
void stereo_mix(const CELTMode *m, celt_norm_t *X, const celt_ener_t *bank, int dir);
#endif /* BANDS_H */