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Added support for codebooks up to 64 bits.

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This commit is contained in:
Jean-Marc Valin 2007-12-11 14:52:56 +11:00
parent f13fea7b53
commit f8db800c44
5 changed files with 153 additions and 4 deletions
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1
libcelt/arch.h
View file

@ -66,6 +66,7 @@
#endif
typedef unsigned long long celt_uint64_t;
typedef int spx_int32_t;
typedef short spx_int16_t;

139
libcelt/cwrs.c
View file

@ -95,6 +95,30 @@ unsigned ncwrs(int _n,int _m){
}
#endif
celt_uint64_t ncwrs64(int _n,int _m){
celt_uint64_t ret;
celt_uint64_t f;
celt_uint64_t d;
int i;
if(_n<0||_m<0)return 0;
if(_m==0)return 1;
if(_n==0)return 0;
ret=0;
f=_n;
d=1;
for(i=1;i<=_m;i++){
ret+=f*d<<i;
#if 0
f=umuldiv(f,_n-i,i+1);
d=umuldiv(d,_m-i,i);
#else
f=(f*(_n-i))/(i+1);
d=(d*(_m-i))/i;
#endif
}
return ret;
}
/*Returns the _i'th combination of _m elements chosen from a set of size _n
with associated sign bits.
_x: Returns the combination with elements sorted in ascending order.
@ -161,6 +185,74 @@ unsigned icwrs(int _n,int _m,const int *_x,const int *_s){
return i;
}
/*Returns the _i'th combination of _m elements chosen from a set of size _n
with associated sign bits.
_x: Returns the combination with elements sorted in ascending order.
_s: Returns the associated sign bits.*/
void cwrsi64(int _n,int _m,celt_uint64_t _i,int *_x,int *_s){
celt_uint64_t pn;
int j;
int k;
pn=ncwrs64(_n-1,_m);
for(k=j=0;k<_m;k++){
celt_uint64_t pp;
celt_uint64_t p;
celt_uint64_t t;
pp=0;
p=ncwrs64(_n-j,_m-k)-pn;
if(k>0){
t=p>>1;
if(t<=_i||_s[k-1])_i+=t;
}
pn=ncwrs64(_n-j-1,_m-k-1);
while(p<=_i){
pp=p;
j++;
p+=pn;
pn=ncwrs64(_n-j-1,_m-k-1);
p+=pn;
}
t=p-pp>>1;
_s[k]=_i-pp>=t;
_x[k]=j;
_i-=pp;
if(_s[k])_i-=t;
}
}
/*Returns the index of the given combination of _m elements chosen from a set
of size _n with associated sign bits.
_x: The combination with elements sorted in ascending order.
_s: The associated sign bits.*/
celt_uint64_t icwrs64(int _n,int _m,const int *_x,const int *_s){
celt_uint64_t pn;
celt_uint64_t i;
int j;
int k;
i=0;
pn=ncwrs64(_n-1,_m);
for(k=j=0;k<_m;k++){
celt_uint64_t pp;
celt_uint64_t p;
pp=0;
p=ncwrs64(_n-j,_m-k)-pn;
if(k>0)p>>=1;
pn=ncwrs64(_n-j-1,_m-k-1);
while(j<_x[k]){
pp=p;
j++;
p+=pn;
pn=ncwrs64(_n-j-1,_m-k-1);
p+=pn;
}
i+=pp;
if((k==0||_x[k]!=_x[k-1])&&_s[k])i+=p-pp>>1;
}
return i;
}
/*Converts a combination _x of _m unit pulses with associated sign bits _s into
a pulse vector _y of length _n.
_y: Returns the vector of pulses.
@ -244,3 +336,50 @@ int main(int _argc,char **_argv){
return 0;
}
*/
/*
#include <stdio.h>
#define NMAX (32)
#define MMAX (16)
int main(int _argc,char **_argv){
int n;
for(n=0;n<=NMAX;n+=3){
int m;
for(m=0;m<=MMAX;m++){
celt_uint64_t nc;
celt_uint64_t i;
nc=ncwrs64(n,m);
printf("%d/%d: %llu",n,m, nc);
for(i=0;i<nc;i+=100000){
int x[MMAX];
int s[MMAX];
int x2[MMAX];
int s2[MMAX];
int y[NMAX];
int j;
int k;
cwrsi64(n,m,i,x,s);
//printf("%llu of %llu:",i,nc);
for(k=0;k<m;k++){
//printf(" %c%i",k>0&&x[k]==x[k-1]?' ':s[k]?'-':'+',x[k]);
}
//printf(" ->");
if(icwrs64(n,m,x,s)!=i){
fprintf(stderr,"Combination-index mismatch.\n");
}
comb2pulse(n,m,y,x,s);
//for(j=0;j<n;j++)printf(" %c%i",y[j]?y[j]<0?'-':'+':' ',abs(y[j]));
//printf("\n");
pulse2comb(n,m,x2,s2,y);
for(k=0;k<m;k++)if(x[k]!=x2[k]||s[k]!=s2[k]){
fprintf(stderr,"Pulse-combination mismatch.\n");
break;
}
}
printf("\n");
}
}
return 0;
}
*/

8
libcelt/cwrs.h
View file

@ -32,6 +32,7 @@
#ifndef CWRS_H
#define CWRS_H
#include "arch.h"
unsigned ncwrs(int _n,int _m);
@ -43,4 +44,11 @@ void comb2pulse(int _n,int _m,int *_y,const int *_x,const int *_s);
void pulse2comb(int _n,int _m,int *_x,int *_s,const int *_y);
/* 64-bit versions */
celt_uint64_t ncwrs64(int _n,int _m);
void cwrsi64(int _n,int _m,celt_uint64_t _i,int *_x,int *_s);
celt_uint64_t icwrs64(int _n,int _m,const int *_x,const int *_s);
#endif /* CWRS_H */

1
libcelt/modes.c
View file

@ -39,6 +39,7 @@ const int qbank1[NBANDS128+2] = {0, 2, 4, 6, 8, 12, 16, 20, 24, 28, 36, 44, 52
const int qpulses1[NBANDS128] = {7, 5, 5, 5, 4, 5, 4, 5, 5, 4, -2, 0, 0, 0, 0};
const int qpulses2[NBANDS128] = {28,24,20,16,24,20, 18, 12, 10, 10,-7, -4, 0, 0, 0};
const int qpulses2b[NBANDS128] = {32,28,24,20,28,24, 22, 18, 16, 15,-12, -12, 12, 12, 0};
const int pbank1[PBANDS128+2] = {0, 4, 8, 12, 20, PITCH_END128, 128};

8
libcelt/vq.c
View file

@ -187,7 +187,7 @@ void alg_quant(float *x, int N, int K, float *p, ec_enc *enc)
//for (i=0;i<N;i++)
// printf ("%d ", iy[0][i]);
pulse2comb(N, K, comb, signs, iy[0]);
ec_enc_uint(enc,icwrs(N, K, comb, signs),ncwrs(N, K));
ec_enc_uint64(enc,icwrs64(N, K, comb, signs),ncwrs64(N, K));
}
static const float pg[5] = {1.f, .82f, .75f, 0.7f, 0.6f};
@ -264,7 +264,7 @@ void copy_quant(float *x, int N, int K, float *Y, int B, int N0, ec_enc *enc)
void alg_unquant(float *x, int N, int K, float *p, ec_dec *dec)
{
int i;
unsigned int id;
celt_uint64_t id;
int comb[K];
int signs[K];
int iy[N];
@ -273,8 +273,8 @@ void alg_unquant(float *x, int N, int K, float *p, ec_dec *dec)
float Rpp=0, Ryp=0, Ryy=0;
float g;
id = ec_dec_uint(dec, ncwrs(N, K));
cwrsi(N, K, id, comb, signs);
id = ec_dec_uint64(dec, ncwrs64(N, K));
cwrsi64(N, K, id, comb, signs);
comb2pulse(N, K, iy, comb, signs);
//for (i=0;i<N;i++)
// printf ("%d ", iy[i]);