80 lines
3.5 KiB
C
80 lines
3.5 KiB
C
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/* (C) 2007-2008 Jean-Marc Valin, CSIRO
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*/
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/**
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@file vq.h
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@brief Vector quantisation of the residual
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*/
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef VQ_H
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#define VQ_H
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#include "entenc.h"
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#include "entdec.h"
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#include "modes.h"
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/** Algebraic pulse-vector quantiser. The signal x is replaced by the sum of
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* the pitch and a combination of pulses such that its norm is still equal
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* to 1. This is the function that will typically require the most CPU.
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* @param x Residual signal to quantise/encode (returns quantised version)
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* @param W Perceptual weight to use when optimising (currently unused)
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* @param N Number of samples to encode
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* @param K Number of pulses to use
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* @param p Pitch vector (it is assumed that p+x is a unit vector)
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* @param enc Entropy encoder state
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*/
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void alg_quant(celt_norm_t *X, celt_mask_t *W, int N, int K, celt_norm_t *P, ec_enc *enc);
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/** Algebraic pulse decoder
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* @param x Decoded normalised spectrum (returned)
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* @param N Number of samples to decode
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* @param K Number of pulses to use
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* @param p Pitch vector (automatically added to x)
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* @param dec Entropy decoder state
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*/
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void alg_unquant(celt_norm_t *X, int N, int K, celt_norm_t *P, ec_dec *dec);
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celt_word16_t renormalise_vector(celt_norm_t *X, celt_word16_t value, int N, int stride);
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/** Intra-frame predictor that matches a section of the current frame (at lower
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* frequencies) to encode the current band.
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* @param x Residual signal to quantise/encode (returns quantised version)
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* @param W Perceptual weight
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* @param N Number of samples to encode
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* @param K Number of pulses to use
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* @param Y Lower frequency spectrum to use, normalised to the same standard deviation
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* @param P Pitch vector (it is assumed that p+x is a unit vector)
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* @param B Stride (number of channels multiplied by the number of MDCTs per frame)
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* @param N0 Number of valid offsets
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*/
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void intra_fold(const CELTMode *m, celt_norm_t * __restrict x, int N, int *pulses, celt_norm_t *Y, celt_norm_t * __restrict P, int N0, int B);
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#endif /* VQ_H */
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