215 lines
6 KiB
C
215 lines
6 KiB
C
/* (C) 2007 Jean-Marc Valin, CSIRO
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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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#include <math.h>
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#include "bands.h"
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#include "modes.h"
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#include "vq.h"
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#include "cwrs.h"
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/* Compute the energy in each of the bands */
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void compute_band_energies(const CELTMode *m, float *X, float *bank)
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{
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int i, B;
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const int *eBands = m->eBands;
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B = m->nbMdctBlocks;
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for (i=0;i<m->nbEBands;i++)
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{
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int j;
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bank[i] = 1e-10;
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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bank[i] += X[j]*X[j];
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bank[i] = sqrt(bank[i]);
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}
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}
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/* Normalise each band such that the energy is one. */
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void normalise_bands(const CELTMode *m, float *X, float *bank)
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{
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int i, B;
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const int *eBands = m->eBands;
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B = m->nbMdctBlocks;
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for (i=0;i<m->nbEBands;i++)
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{
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int j;
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float x = 1.f/(1e-10+bank[i]);
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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X[j] *= x;
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}
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for (i=B*eBands[m->nbEBands];i<B*eBands[m->nbEBands+1];i++)
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X[i] = 0;
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}
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/* De-normalise the energy to produce the synthesis from the unit-energy bands */
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void denormalise_bands(const CELTMode *m, float *X, float *bank)
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{
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int i, B;
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const int *eBands = m->eBands;
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B = m->nbMdctBlocks;
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for (i=0;i<m->nbEBands;i++)
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{
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int j;
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float x = bank[i];
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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X[j] *= x;
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}
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for (i=B*eBands[m->nbEBands];i<B*eBands[m->nbEBands+1];i++)
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X[i] = 0;
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}
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/* Compute the best gain for each "pitch band" */
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void compute_pitch_gain(const CELTMode *m, float *X, float *P, float *gains, float *bank)
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{
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int i, B;
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const int *eBands = m->eBands;
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const int *pBands = m->pBands;
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B = m->nbMdctBlocks;
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float w[B*eBands[m->nbEBands]];
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for (i=0;i<m->nbEBands;i++)
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{
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int j;
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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w[j] = bank[i];
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}
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for (i=0;i<m->nbPBands;i++)
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{
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float Sxy=0;
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float Sxx = 0;
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int j;
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float gain;
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for (j=B*pBands[i];j<B*pBands[i+1];j++)
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{
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Sxy += X[j]*P[j]*w[j];
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Sxx += X[j]*X[j]*w[j];
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}
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gain = Sxy/(1e-10+Sxx);
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//gain = Sxy/(2*(pbank[i+1]-pbank[i]));
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//if (i<3)
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//gain *= 1+.02*gain;
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if (gain > .90)
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gain = .90;
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if (gain < 0.0)
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gain = 0.0;
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gains[i] = gain;
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}
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for (i=B*pBands[m->nbPBands];i<B*pBands[m->nbPBands+1];i++)
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P[i] = 0;
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}
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/* Apply the (quantised) gain to each "pitch band" */
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void pitch_quant_bands(const CELTMode *m, float *X, float *P, float *gains)
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{
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int i, B;
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const int *pBands = m->pBands;
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B = m->nbMdctBlocks;
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for (i=0;i<m->nbPBands;i++)
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{
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int j;
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for (j=B*pBands[i];j<B*pBands[i+1];j++)
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P[j] *= gains[i];
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//printf ("%f ", gain);
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}
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for (i=B*pBands[m->nbPBands];i<B*pBands[m->nbPBands+1];i++)
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P[i] = 0;
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}
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void quant_bands(const CELTMode *m, float *X, float *P)
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{
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int i, j, B;
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const int *eBands = m->eBands;
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B = m->nbMdctBlocks;
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float norm[B*eBands[m->nbEBands+1]];
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//float bits = 0;
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for (i=0;i<m->nbEBands;i++)
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{
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int q;
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q = m->nbPulses[i];
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if (q>0) {
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float n = sqrt(B*(eBands[i+1]-eBands[i]));
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alg_quant2(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), q, P+B*eBands[i]);
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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norm[j] = X[j] * n;
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//bits += log2(ncwrs(B*(eBands[i+1]-eBands[i]), q));
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} else {
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float n = sqrt(B*(eBands[i+1]-eBands[i]));
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copy_quant(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), -q, norm, B, eBands[i]);
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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norm[j] = X[j] * n;
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//bits += 1+log2(eBands[i])+log2(ncwrs(B*(eBands[i+1]-eBands[i]), -q));
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}
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}
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//printf ("%f\n", bits);
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for (i=B*eBands[m->nbEBands];i<B*eBands[m->nbEBands+1];i++)
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X[i] = 0;
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}
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/* Scales the pulse-codebook entry in each band such that unit-energy is conserved when
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adding the pitch */
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void pitch_renormalise_bands(const CELTMode *m, float *X, float *P)
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{
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int i, B;
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const int *eBands = m->eBands;
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B = m->nbMdctBlocks;
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for (i=0;i<m->nbEBands;i++)
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{
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int j;
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float Rpp=0;
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float Rxp=0;
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float Rxx=0;
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float gain1;
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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{
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Rxp += X[j]*P[j];
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Rpp += P[j]*P[j];
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Rxx += X[j]*X[j];
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}
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float arg = Rxp*Rxp + 1 - Rpp;
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if (arg < 0)
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arg = 0;
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gain1 = sqrt(arg)-Rxp;
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Rxx = 0;
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for (j=B*eBands[i];j<B*eBands[i+1];j++)
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{
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X[j] = P[j]+gain1*X[j];
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Rxx += X[j]*X[j];
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}
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}
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for (i=B*eBands[m->nbEBands];i<B*eBands[m->nbEBands+1];i++)
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X[i] = 0;
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}
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