ref: 43b3537d380e50db1acfd7109cfb0c091282c59f
dir: /libcelt/quant_bands.c/
/* (C) 2007 Jean-Marc Valin, CSIRO
*/
/*
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
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
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "quant_bands.h"
#include "laplace.h"
#include <math.h>
#include "os_support.h"
#include "arch.h"
#ifdef FIXED_POINT
const float eMeans[24] = {11520, -2048, -3072, -640, 256, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
#else
const float eMeans[24] = {45.f, -8.f, -12.f, -2.5f, 1.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
#endif
/*const int frac[24] = {4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2};*/
const int frac[24] = {8, 6, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2};
#ifdef FIXED_POINT
#define Q8 256.f
#define Q8_1 (1.f/256.f)
#else
#define Q8 1.f
#define Q8_1 1.f
#endif
static void quant_energy_mono(const CELTMode *m, celt_ener_t *eBands, celt_word16_t *oldEBands, int budget, ec_enc *enc)
{
int i;
int bits;
celt_word16_t prev = 0;
float coef = m->ePredCoef;
VARDECL(celt_word16_t *error);
/* The .7 is a heuristic */
float beta = .7*coef;
ALLOC(error, m->nbEBands, celt_word16_t);
bits = ec_enc_tell(enc, 0);
for (i=0;i<m->nbEBands;i++)
{
int qi;
celt_word16_t q; /* dB */
celt_word16_t res; /* dB */
celt_word16_t x; /* dB */
celt_word16_t f; /* Q8 */
celt_word16_t mean = (1-coef)*eMeans[i];
x = DB_SCALING*20*log10(.3+ENER_SCALING_1*eBands[i]);
res = DB_SCALING*6;
f = QCONST16(1.f,8)*(x-mean-coef*oldEBands[i]-prev*1.f)/res;
#ifdef FIXED_POINT
/* Rounding to nearest integer here is really important! */
qi = (f+128)>>8;
#else
qi = (int)floor(.5+f);
#endif
/*ec_laplace_encode(enc, qi, i==0?11192:6192);*/
/*ec_laplace_encode(enc, qi, 8500-i*200);*/
/* If we don't have enough bits to encode all the energy, just assume something safe. */
if (ec_enc_tell(enc, 0) - bits > budget)
qi = -1;
else
ec_laplace_encode(enc, qi, 6000-i*200);
q = qi*res;
error[i] = f - SHL16(qi,8);
/*printf("%d ", qi);*/
/*printf("%f %f ", pred+prev+q, x);*/
/*printf("%f ", x-pred);*/
oldEBands[i] = mean+coef*oldEBands[i]+prev+q;
prev = mean+prev+(1-beta)*q;
}
/*bits = ec_enc_tell(enc, 0) - bits;*/
/*printf ("%d\n", bits);*/
for (i=0;i<m->nbEBands;i++)
{
int q2;
float offset = Q8_1*(error[i]+QCONST16(.5f,8))*frac[i];
/* FIXME: Instead of giving up without warning, we should degrade everything gracefully */
if (ec_enc_tell(enc, 0) - bits +EC_ILOG(frac[i])> budget)
break;
q2 = (int)floor(offset);
if (q2 > frac[i]-1)
q2 = frac[i]-1;
ec_enc_uint(enc, q2, frac[i]);
offset = ((q2+.5)/frac[i])-.5;
oldEBands[i] += DB_SCALING*6.*offset;
/*printf ("%f ", error[i] - offset);*/
}
for (i=0;i<m->nbEBands;i++)
{
eBands[i] = ENER_SCALING*(pow(10, .05*DB_SCALING_1*oldEBands[i])-.3);
if (eBands[i] < 0)
eBands[i] = 0;
}
/*printf ("%d\n", ec_enc_tell(enc, 0)-9);*/
/*printf ("\n");*/
}
static void unquant_energy_mono(const CELTMode *m, celt_ener_t *eBands, celt_word16_t *oldEBands, int budget, ec_dec *dec)
{
int i;
int bits;
float prev = 0;
float coef = m->ePredCoef;
/* The .7 is a heuristic */
float beta = .7*coef;
bits = ec_dec_tell(dec, 0);
for (i=0;i<m->nbEBands;i++)
{
int qi;
float q;
float res;
float mean = (1-coef)*eMeans[i];
res = 6.;
/* If we didn't have enough bits to encode all the energy, just assume something safe. */
if (ec_dec_tell(dec, 0) - bits > budget)
qi = -1;
else
qi = ec_laplace_decode(dec, 6000-i*200);
q = qi*res;
oldEBands[i] = DB_SCALING*(DB_SCALING_1*mean+coef*DB_SCALING_1*oldEBands[i]+prev+q);
prev = DB_SCALING_1*mean+prev+(1-beta)*q;
}
for (i=0;i<m->nbEBands;i++)
{
int q2;
float offset;
if (ec_dec_tell(dec, 0) - bits +EC_ILOG(frac[i])> budget)
break;
q2 = ec_dec_uint(dec, frac[i]);
offset = ((q2+.5)/frac[i])-.5;
oldEBands[i] += DB_SCALING*6.*offset;
}
for (i=0;i<m->nbEBands;i++)
{
/*printf ("%f ", error[i] - offset);*/
eBands[i] = ENER_SCALING*(pow(10, .05*DB_SCALING_1*oldEBands[i])-.3);
if (eBands[i] < 0)
eBands[i] = 0;
}
/*printf ("\n");*/
}
void quant_energy(const CELTMode *m, celt_ener_t *eBands, celt_word16_t *oldEBands, int budget, ec_enc *enc)
{
int C;
C = m->nbChannels;
if (C==1)
quant_energy_mono(m, eBands, oldEBands, budget, enc);
else
#if 1
{
int c;
VARDECL(celt_ener_t *E);
ALLOC(E, m->nbEBands, celt_ener_t);
for (c=0;c<C;c++)
{
int i;
for (i=0;i<m->nbEBands;i++)
E[i] = eBands[C*i+c];
quant_energy_mono(m, E, oldEBands+c*m->nbEBands, budget/C, enc);
for (i=0;i<m->nbEBands;i++)
eBands[C*i+c] = E[i];
}
}
#else
if (C==2)
{
int i;
int NB = m->nbEBands;
float mid[NB];
float side[NB];
float left;
float right;
for (i=0;i<NB;i++)
{
//left = eBands[C*i];
//right = eBands[C*i+1];
mid[i] = ENER_SCALING_1*sqrt(eBands[C*i]*eBands[C*i] + eBands[C*i+1]*eBands[C*i+1]);
side[i] = 20*log10((ENER_SCALING_1*eBands[2*i]+.3)/(ENER_SCALING_1*eBands[2*i+1]+.3));
//printf ("%f %f ", mid[i], side[i]);
}
//printf ("\n");
quant_energy_mono(m, mid, oldEBands, enc);
for (i=0;i<NB;i++)
side[i] = pow(10.f,floor(.5f+side[i])/10.f);
//quant_energy_side(m, side, oldEBands+NB, enc);
for (i=0;i<NB;i++)
{
eBands[C*i] = ENER_SCALING*mid[i]*sqrt(side[i]/(1.f+side[i]));
eBands[C*i+1] = ENER_SCALING*mid[i]*sqrt(1.f/(1.f+side[i]));
//printf ("%f %f ", mid[i], side[i]);
}
} else {
celt_fatal("more than 2 channels not supported");
}
#endif
}
void unquant_energy(const CELTMode *m, celt_ener_t *eBands, celt_word16_t *oldEBands, int budget, ec_dec *dec)
{
int C;
C = m->nbChannels;
if (C==1)
unquant_energy_mono(m, eBands, oldEBands, budget, dec);
else {
int c;
VARDECL(celt_ener_t *E);
ALLOC(E, m->nbEBands, celt_ener_t);
for (c=0;c<C;c++)
{
int i;
unquant_energy_mono(m, E, oldEBands+c*m->nbEBands, budget/C, dec);
for (i=0;i<m->nbEBands;i++)
eBands[C*i+c] = E[i];
}
}
}