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fixed-point: converted compute_pitch_gain() and removed the energy-based

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weighting that didn't seem to help anyway.
This commit is contained in:
Jean-Marc Valin 2008-02-27 15:35:43 +11:00
parent 3f382caeb4
commit ff74e396e4
2 changed files with 19 additions and 23 deletions
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5
libcelt/arch.h
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@ -67,12 +67,15 @@ typedef float celt_mask_t;
#define NORM_SCALING_1 (1.f/16384.f) #define NORM_SCALING_1 (1.f/16384.f)
#define ENER_SCALING 16384.f #define ENER_SCALING 16384.f
#define ENER_SCALING_1 (1.f/16384.f) #define ENER_SCALING_1 (1.f/16384.f)
#define PGAIN_SCALING 32768.f #define PGAIN_SCALING 32768.f
#define PGAIN_SCALING_1 (1.f/32768.f) #define PGAIN_SCALING_1 (1.f/32768.f)
#define PGAIN_SHIFT 15
#define DB_SCALING 256.f #define DB_SCALING 256.f
#define DB_SCALING_1 (1.f/256.f) #define DB_SCALING_1 (1.f/256.f)
#define EPSILON 1
#define VERY_SMALL 0 #define VERY_SMALL 0
#define VERY_LARGE32 ((celt_word32_t)2147483647) #define VERY_LARGE32 ((celt_word32_t)2147483647)
#define VERY_LARGE16 ((celt_word16_t)32767) #define VERY_LARGE16 ((celt_word16_t)32767)
@ -121,7 +124,7 @@ typedef float celt_mask_t;
#define DB_SCALING 1.f #define DB_SCALING 1.f
#define DB_SCALING_1 1.f #define DB_SCALING_1 1.f
#define EPSILON 1e-15
#define VERY_SMALL 1e-15f #define VERY_SMALL 1e-15f
#define VERY_LARGE32 1e15f #define VERY_LARGE32 1e15f
#define VERY_LARGE16 1e15f #define VERY_LARGE16 1e15f

37
libcelt/bands.c
View file

@ -163,36 +163,29 @@ void compute_pitch_gain(const CELTMode *m, celt_norm_t *X, celt_norm_t *P, celt_
int i, B; int i, B;
const int *eBands = m->eBands; const int *eBands = m->eBands;
const int *pBands = m->pBands; const int *pBands = m->pBands;
VARDECL(float *w);
B = m->nbMdctBlocks*m->nbChannels; B = m->nbMdctBlocks*m->nbChannels;
ALLOC(w, B*eBands[m->nbEBands], float);
for (i=0;i<m->nbEBands;i++)
{
int j;
for (j=B*eBands[i];j<B*eBands[i+1];j++)
w[j] = bank[i]*ENER_SCALING_1;
}
for (i=0;i<m->nbPBands;i++) for (i=0;i<m->nbPBands;i++)
{ {
float Sxy=0; celt_word32_t Sxy=0, Sxx=0;
float Sxx = 0;
int j; int j;
float gain; /* We know we're not going to overflow because Sxx can't be more than 1 (Q28) */
for (j=B*pBands[i];j<B*pBands[i+1];j++) for (j=B*pBands[i];j<B*pBands[i+1];j++)
{ {
Sxy += 1.f*X[j]*P[j]*w[j]; Sxy = MAC16_16(Sxy, X[j], P[j]);
Sxx += 1.f*X[j]*X[j]*w[j]; Sxx = MAC16_16(Sxx, X[j], X[j]);
} }
gain = Sxy/(1e-10*NORM_SCALING*NORM_SCALING+Sxx); /* No negative gain allowed */
if (gain > 1.f) if (Sxy < 0)
gain = 1.f; Sxy = 0;
if (gain < 0.0f) /* Not sure how that would happen, just making sure */
gain = 0.0f; if (Sxy > Sxx)
/* We need to be a bit conservative, otherwise residual doesn't quantise well */ Sxy = Sxx;
gain *= .9f; /* We need to be a bit conservative (multiply gain by 0.9), otherwise the
gains[i] = PGAIN_SCALING*gain; residual doesn't quantise well */
Sxy = MULT16_32_Q15(QCONST16(.9f, 15), Sxy);
/* gain = Sxy/Sxx */
gains[i] = DIV32_16(Sxy,ADD32(SHR32(Sxx, PGAIN_SHIFT),EPSILON));
/*printf ("%f ", 1-sqrt(1-gain*gain));*/ /*printf ("%f ", 1-sqrt(1-gain*gain));*/
} }
/*if(rand()%10==0) /*if(rand()%10==0)