You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

312 lines
8.1 KiB

/* Copyright (C) 2002 Jean-Marc Valin
File: quant_lsp.c
LSP vector quantization
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.
*/
#include "quant_lsp.h"
#include <math.h>
extern int lsp_nb_vqid[64];
static float quant_weight[MAX_LSP_SIZE];
/* Note: x is modified*/
static int lsp_quant(float *x, signed char *cdbk, int nbVec, int nbDim)
{
int i,j;
float dist, tmp;
float best_dist=0;
int best_id=0;
signed char *ptr=cdbk;
for (i=0;i<nbVec;i++)
{
dist=0;
for (j=0;j<nbDim;j++)
{
tmp=(x[j]-*ptr++);
dist+=tmp*tmp;
}
if (dist<best_dist || i==0)
{
best_dist=dist;
best_id=i;
}
}
for (j=0;j<nbDim;j++)
x[j] -= cdbk[best_id*nbDim+j];
return best_id;
}
/* Note: x is modified*/
static int lsp_weight_quant(float *x, float *weight, signed char *cdbk, int nbVec, int nbDim)
{
int i,j;
float dist, tmp;
float best_dist=0;
int best_id=0;
signed char *ptr=cdbk;
for (i=0;i<nbVec;i++)
{
dist=0;
for (j=0;j<nbDim;j++)
{
tmp=(x[j]-*ptr++);
dist+=weight[j]*tmp*tmp;
}
if (dist<best_dist || i==0)
{
best_dist=dist;
best_id=i;
}
}
for (j=0;j<nbDim;j++)
x[j] -= cdbk[best_id*nbDim+j];
return best_id;
}
void lsp_quant_nb(float *lsp, float *qlsp, int order, SpeexBits *bits)
{
int i;
float tmp1, tmp2;
int id;
for (i=0;i<order;i++)
qlsp[i]=lsp[i];
quant_weight[0] = 1/(qlsp[1]-qlsp[0]);
quant_weight[order-1] = 1/(qlsp[order-1]-qlsp[order-2]);
for (i=1;i<order-1;i++)
{
#if 1
tmp1 = 1/((.15+qlsp[i]-qlsp[i-1])*(.15+qlsp[i]-qlsp[i-1]));
tmp2 = 1/((.15+qlsp[i+1]-qlsp[i])*(.15+qlsp[i+1]-qlsp[i]));
#else
tmp1 = 1/(qlsp[i]-qlsp[i-1]);
tmp2 = 1/(qlsp[i+1]-qlsp[i]);
#endif
quant_weight[i] = tmp1 > tmp2 ? tmp1 : tmp2;
}
for (i=0;i<order;i++)
qlsp[i]-=(.25*i+.25);
for (i=0;i<order;i++)
qlsp[i]*=256;
id = lsp_quant(qlsp, cdbk_nb, NB_CDBK_SIZE, order);
speex_bits_pack(bits, id, 6);
for (i=0;i<order;i++)
qlsp[i]*=2;
id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low1, NB_CDBK_SIZE_LOW1, 5);
speex_bits_pack(bits, id, 6);
for (i=0;i<5;i++)
qlsp[i]*=2;
id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low2, NB_CDBK_SIZE_LOW2, 5);
speex_bits_pack(bits, id, 6);
id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high1, NB_CDBK_SIZE_HIGH1, 5);
speex_bits_pack(bits, id, 6);
for (i=5;i<10;i++)
qlsp[i]*=2;
id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high2, NB_CDBK_SIZE_HIGH2, 5);
speex_bits_pack(bits, id, 6);
for (i=0;i<order;i++)
qlsp[i]*=.00097656;
for (i=0;i<order;i++)
qlsp[i]=lsp[i]-qlsp[i];
}
void lsp_unquant_nb(float *lsp, int order, SpeexBits *bits)
{
int i, id;
for (i=0;i<order;i++)
lsp[i]=.25*i+.25;
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<10;i++)
lsp[i] += 0.0039062*cdbk_nb[id*10+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<5;i++)
lsp[i] += 0.0019531 * cdbk_nb_low1[id*5+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<5;i++)
lsp[i] += 0.00097656 * cdbk_nb_low2[id*5+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<5;i++)
lsp[i+5] += 0.0019531 * cdbk_nb_high1[id*5+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<5;i++)
lsp[i+5] += 0.00097656 * cdbk_nb_high2[id*5+i];
}
void lsp_quant_lbr(float *lsp, float *qlsp, int order, SpeexBits *bits)
{
int i;
float tmp1, tmp2;
int id;
for (i=0;i<order;i++)
qlsp[i]=lsp[i];
quant_weight[0] = 1/(qlsp[1]-qlsp[0]);
quant_weight[order-1] = 1/(qlsp[order-1]-qlsp[order-2]);
for (i=1;i<order-1;i++)
{
#if 1
tmp1 = 1/((.15+qlsp[i]-qlsp[i-1])*(.15+qlsp[i]-qlsp[i-1]));
tmp2 = 1/((.15+qlsp[i+1]-qlsp[i])*(.15+qlsp[i+1]-qlsp[i]));
#else
tmp1 = 1/(qlsp[i]-qlsp[i-1]);
tmp2 = 1/(qlsp[i+1]-qlsp[i]);
#endif
quant_weight[i] = tmp1 > tmp2 ? tmp1 : tmp2;
}
for (i=0;i<order;i++)
qlsp[i]-=(.25*i+.25);
for (i=0;i<order;i++)
qlsp[i]*=256;
id = lsp_quant(qlsp, cdbk_nb, NB_CDBK_SIZE, order);
speex_bits_pack(bits, id, 6);
for (i=0;i<order;i++)
qlsp[i]*=2;
id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low1, NB_CDBK_SIZE_LOW1, 5);
speex_bits_pack(bits, id, 6);
id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high1, NB_CDBK_SIZE_HIGH1, 5);
speex_bits_pack(bits, id, 6);
for (i=0;i<order;i++)
qlsp[i]*=0.0019531;
for (i=0;i<order;i++)
qlsp[i]=lsp[i]-qlsp[i];
}
void lsp_unquant_lbr(float *lsp, int order, SpeexBits *bits)
{
int i, id;
for (i=0;i<order;i++)
lsp[i]=.25*i+.25;
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<10;i++)
lsp[i] += 0.0039062*cdbk_nb[id*10+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<5;i++)
lsp[i] += 0.0019531*cdbk_nb_low1[id*5+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<5;i++)
lsp[i+5] += 0.0019531*cdbk_nb_high1[id*5+i];
}
extern signed char high_lsp_cdbk[];
extern signed char high_lsp_cdbk2[];
void lsp_quant_high(float *lsp, float *qlsp, int order, SpeexBits *bits)
{
int i;
float tmp1, tmp2;
int id;
for (i=0;i<order;i++)
qlsp[i]=lsp[i];
quant_weight[0] = 1/(qlsp[1]-qlsp[0]);
quant_weight[order-1] = 1/(qlsp[order-1]-qlsp[order-2]);
for (i=1;i<order-1;i++)
{
tmp1 = 1/(qlsp[i]-qlsp[i-1]);
tmp2 = 1/(qlsp[i+1]-qlsp[i]);
quant_weight[i] = tmp1 > tmp2 ? tmp1 : tmp2;
}
for (i=0;i<order;i++)
qlsp[i]-=(.3125*i+.75);
for (i=0;i<order;i++)
qlsp[i]*=256;
id = lsp_quant(qlsp, high_lsp_cdbk, 64, order);
speex_bits_pack(bits, id, 6);
for (i=0;i<order;i++)
qlsp[i]*=2;
id = lsp_weight_quant(qlsp, quant_weight, high_lsp_cdbk2, 64, order);
speex_bits_pack(bits, id, 6);
for (i=0;i<order;i++)
qlsp[i]*=0.0019531;
for (i=0;i<order;i++)
qlsp[i]=lsp[i]-qlsp[i];
}
void lsp_unquant_high(float *lsp, int order, SpeexBits *bits)
{
int i, id;
for (i=0;i<order;i++)
lsp[i]=.3125*i+.75;
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<order;i++)
lsp[i] += 0.0039062*high_lsp_cdbk[id*order+i];
id=speex_bits_unpack_unsigned(bits, 6);
for (i=0;i<order;i++)
lsp[i] += 0.0019531*high_lsp_cdbk2[id*order+i];
}