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Making decode_pulses() compute the L2-norm on the fly

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This commit is contained in:
Jean-Marc Valin 2014-01-21 15:17:01 -05:00
parent 17b197837f
commit 6218cba258
3 changed files with 31 additions and 19 deletions
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40
celt/cwrs.c
View file

@ -460,10 +460,12 @@ void encode_pulses(const int *_y,int _n,int _k,ec_enc *_enc){
ec_enc_uint(_enc,icwrs(_n,_y),CELT_PVQ_V(_n,_k));
}
static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y){
static opus_val32 cwrsi(int _n,int _k,opus_uint32 _i,int *_y){
opus_uint32 p;
int s;
int k0;
opus_int16 val;
opus_val32 yy=0;
celt_assert(_k>0);
celt_assert(_n>1);
while(_n>2){
@ -487,7 +489,9 @@ static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y){
}
else for(p=row[_k];p>_i;p=row[_k])_k--;
_i-=p;
*_y++=(k0-_k+s)^s;
val=(k0-_k+s)^s;
*_y++=val;
yy=MAC16_16(yy,val,val);
}
/*Lots of dimensions case:*/
else{
@ -507,7 +511,9 @@ static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y){
do p=CELT_PVQ_U_ROW[--_k][_n];
while(p>_i);
_i-=p;
*_y++=(k0-_k+s)^s;
val=(k0-_k+s)^s;
*_y++=val;
yy=MAC16_16(yy,val,val);
}
}
_n--;
@ -519,14 +525,19 @@ static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y){
k0=_k;
_k=(_i+1)>>1;
if(_k)_i-=2*_k-1;
*_y++=(k0-_k+s)^s;
val=(k0-_k+s)^s;
*_y++=val;
yy=MAC16_16(yy,val,val);
/*_n==1*/
s=-(int)_i;
*_y=(_k+s)^s;
val=(_k+s)^s;
*_y=val;
yy=MAC16_16(yy,val,val);
return yy;
}
void decode_pulses(int *_y,int _n,int _k,ec_dec *_dec){
cwrsi(_n,_k,ec_dec_uint(_dec,CELT_PVQ_V(_n,_k)),_y);
opus_val32 decode_pulses(int *_y,int _n,int _k,ec_dec *_dec){
return cwrsi(_n,_k,ec_dec_uint(_dec,CELT_PVQ_V(_n,_k)),_y);
}
#else /* SMALL_FOOTPRINT */
@ -591,8 +602,10 @@ static opus_uint32 ncwrs_urow(unsigned _n,unsigned _k,opus_uint32 *_u){
_y: Returns the vector of pulses.
_u: Must contain entries [0..._k+1] of row _n of U() on input.
Its contents will be destructively modified.*/
static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y,opus_uint32 *_u){
static opus_val32 cwrsi(int _n,int _k,opus_uint32 _i,int *_y,opus_uint32 *_u){
int j;
opus_int16 val;
opus_val32 yy=0;
celt_assert(_n>0);
j=0;
do{
@ -607,10 +620,13 @@ static void cwrsi(int _n,int _k,opus_uint32 _i,int *_y,opus_uint32 *_u){
while(p>_i)p=_u[--_k];
_i-=p;
yj-=_k;
_y[j]=(yj+s)^s;
val=(yj+s)^s;
_y[j]=val;
yy=MAC16_16(yy,val,val);
uprev(_u,_k+2,0);
}
while(++j<_n);
return yy;
}
/*Returns the index of the given combination of K elements chosen from a set
@ -685,13 +701,15 @@ void encode_pulses(const int *_y,int _n,int _k,ec_enc *_enc){
RESTORE_STACK;
}
void decode_pulses(int *_y,int _n,int _k,ec_dec *_dec){
opus_val32 decode_pulses(int *_y,int _n,int _k,ec_dec *_dec){
VARDECL(opus_uint32,u);
int ret;
SAVE_STACK;
celt_assert(_k>0);
ALLOC(u,_k+2U,opus_uint32);
cwrsi(_n,_k,ec_dec_uint(_dec,ncwrs_urow(_n,_k,u)),_y,u);
ret = cwrsi(_n,_k,ec_dec_uint(_dec,ncwrs_urow(_n,_k,u)),_y,u);
RESTORE_STACK;
return ret;
}
#endif /* SMALL_FOOTPRINT */

2
celt/cwrs.h
View file

@ -43,6 +43,6 @@ void get_required_bits(opus_int16 *bits, int N, int K, int frac);
void encode_pulses(const int *_y, int N, int K, ec_enc *enc);
void decode_pulses(int *_y, int N, int K, ec_dec *dec);
opus_val32 decode_pulses(int *_y, int N, int K, ec_dec *dec);
#endif /* CWRS_H */

8
celt/vq.c
View file

@ -325,7 +325,6 @@ unsigned alg_quant(celt_norm *X, int N, int K, int spread, int B, ec_enc *enc
unsigned alg_unquant(celt_norm *X, int N, int K, int spread, int B,
ec_dec *dec, opus_val16 gain)
{
int i;
opus_val32 Ryy;
unsigned collapse_mask;
VARDECL(int, iy);
@ -334,12 +333,7 @@ unsigned alg_unquant(celt_norm *X, int N, int K, int spread, int B,
celt_assert2(K>0, "alg_unquant() needs at least one pulse");
celt_assert2(N>1, "alg_unquant() needs at least two dimensions");
ALLOC(iy, N, int);
decode_pulses(iy, N, K, dec);
Ryy = 0;
i=0;
do {
Ryy = MAC16_16(Ryy, iy[i], iy[i]);
} while (++i < N);
Ryy = decode_pulses(iy, N, K, dec);
normalise_residual(iy, X, N, Ryy, gain);
exp_rotation(X, N, -1, B, K, spread);
collapse_mask = extract_collapse_mask(iy, N, B);