67 lines
2.2 KiB
C
67 lines
2.2 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 "quant_bands.h"
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#include <math.h>
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void quant_energy(CELTMode *m, float *eBands, float *oldEBands)
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{
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int i;
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float prev = 0;
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for (i=0;i<m->nbEBands;i++)
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{
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int qi;
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float q;
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float res;
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float x;
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float pred = .7*oldEBands[i];
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x = 20*log10(.3+eBands[i]);
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res = .25f*(i+3.f);
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//res = 1;
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qi = (int)floor(.5+(x-pred-prev)/res);
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q = qi*res;
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//printf("%f %f ", pred+prev+q, x);
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//printf("%d ", qi);
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//printf("%f ", x-pred-prev);
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oldEBands[i] = pred+prev+q;
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eBands[i] = pow(10, .05*oldEBands[i])-.3;
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if (eBands[i] < 0)
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eBands[i] = 0;
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prev = (prev + .5*q);
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}
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//printf ("\n");
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}
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