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fixed-point: converted the pitch gain quantisation, except for the codebook

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itself
This commit is contained in:
Jean-Marc Valin 2008-03-05 11:31:57 +11:00
parent a78dc946cd
commit 92376697c6
3 changed files with 29 additions and 12 deletions
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36
libcelt/quant_pitch.c
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@ -37,21 +37,28 @@
#include <math.h>
#include "pgain_table.h"
#include "arch.h"
#include "mathops.h"
#define PGAIN(codebook, i) ((celt_pgain_t)(Q15ONE*(codebook)[i]))
#define Q1515ONE MULT16_16(Q15ONE,Q15ONE)
/* Taken from Speex.
Finds the index of the entry in a codebook that best matches the input*/
int vq_index(float *in, const float *codebook, int len, int entries)
int vq_index(celt_pgain_t *in, const float *codebook, int len, int entries)
{
int i,j;
float min_dist=0;
int index = 0;
celt_word32_t min_dist=0;
int best_index=0;
for (i=0;i<entries;i++)
{
float dist=0;
celt_word32_t dist=0;
for (j=0;j<len;j++)
{
float tmp = in[j]-*codebook++;
dist += tmp*tmp;
celt_pgain_t tmp = SHR16(SUB16(in[j],PGAIN(codebook, index)),1);
index++;
dist = MAC16_16(dist, tmp, tmp);
}
if (i==0 || dist<min_dist)
{
@ -62,20 +69,26 @@ int vq_index(float *in, const float *codebook, int len, int entries)
return best_index;
}
static void id2gains(int id, celt_pgain_t *gains, int len)
{
int i;
for (i=0;i<len;i++)
gains[i] = celt_sqrt(Q1515ONE-MULT16_16(Q15ONE-PGAIN(pgain_table,id*len+i),Q15ONE-PGAIN(pgain_table,id*len+i)));
}
int quant_pitch(celt_pgain_t *gains, int len, ec_enc *enc)
{
int i, id;
VARDECL(float *g2);
VARDECL(celt_pgain_t *g2);
SAVE_STACK;
ALLOC(g2, len, float);
ALLOC(g2, len, celt_pgain_t);
/*for (i=0;i<len;i++) printf ("%f ", gains[i]);printf ("\n");*/
for (i=0;i<len;i++)
g2[i] = 1-sqrt(1-PGAIN_SCALING_1*PGAIN_SCALING_1*gains[i]*gains[i]);
g2[i] = Q15ONE-celt_sqrt(Q1515ONE-MULT16_16(gains[i],gains[i]));
id = vq_index(g2, pgain_table, len, 128);
ec_enc_uint(enc, id, 128);
/*for (i=0;i<len;i++) printf ("%f ", pgain_table[id*len+i]);printf ("\n");*/
for (i=0;i<len;i++)
gains[i] = PGAIN_SCALING*(sqrt(1-(1-pgain_table[id*len+i])*(1-pgain_table[id*len+i])));
id2gains(id, gains, len);
RESTORE_STACK;
return id!=0;
}
@ -84,7 +97,6 @@ int unquant_pitch(celt_pgain_t *gains, int len, ec_dec *dec)
{
int i, id;
id = ec_dec_uint(dec, 128);
for (i=0;i<len;i++)
gains[i] = PGAIN_SCALING*(sqrt(1-(1-pgain_table[id*len+i])*(1-pgain_table[id*len+i])));
id2gains(id, gains, len);
return id!=0;
}