void open_loop_nbest_pitch(spx_sig_t *sw, int start, int end, int len, int *pitch, spx_word16_t *gain, int N, char *stack)
{
int i,j,k;
VARDECL(spx_word32_t *best_score);
spx_word32_t e0;
VARDECL(spx_word32_t *corr);
VARDECL(spx_word32_t *energy);
VARDECL(spx_word32_t *score);
#ifdef FIXED_POINT
VARDECL(spx_word16_t *swn2);
#endif
spx_word16_t *swn;
ALLOC(best_score, N, spx_word32_t);
ALLOC(corr, end-start+1, spx_word32_t);
ALLOC(energy, end-start+2, spx_word32_t);
ALLOC(score, end-start+1, spx_word32_t);
#ifdef FIXED_POINT
ALLOC(swn2, end+len, spx_word16_t);
normalize16(sw-end, swn2, 16384, end+len);
swn = swn2 + end;
#else
swn = sw;
#endif
for (i=0; i<N; i++)
{
best_score[i]=-1;
pitch[i]=start;
}
energy[0]=inner_prod(swn-start, swn-start, len);
e0=inner_prod(swn, swn, len);
for (i=start; i<=end; i++)
{
/* Update energy for next pitch*/
energy[i-start+1] = SUB32(ADD32(energy[i-start],SHR32(MULT16_16(swn[-i-1],swn[-i-1]),6)), SHR32(MULT16_16(swn[-i+len-1],swn[-i+len-1]),6));
}
pitch_xcorr(swn, swn-end, corr, len, end-start+1, stack);
#ifdef FIXED_POINT
{
VARDECL(spx_word16_t *corr16);
VARDECL(spx_word16_t *ener16);
ALLOC(corr16, end-start+1, spx_word16_t);
ALLOC(ener16, end-start+1, spx_word16_t);
normalize16(corr, corr16, 16384, end-start+1);
normalize16(energy, ener16, 16384, end-start+1);
for (i=start; i<=end; i++)
{
spx_word16_t g;
spx_word32_t tmp;
tmp = corr16[i-start];
if (tmp>0)
{
if (SHR16(corr16[i-start],4)>ener16[i-start])
tmp = SHL32(EXTEND32(ener16[i-start]),14);
else if (-SHR16(corr16[i-start],4)>ener16[i-start])
tmp = -SHL32(EXTEND32(ener16[i-start]),14);
else
tmp = SHL32(tmp,10);
g = DIV32_16(tmp, 8+ener16[i-start]);
score[i-start] = MULT16_16(corr16[i-start],g);
} else
{
score[i-start] = 1;
}
}
}
#else
for (i=start; i<=end; i++)
{
float g = corr[i-start]/(1+energy[i-start]);
if (g>16)
g = 16;
else if (g<-16)
g = -16;
score[i-start] = g*corr[i-start];
}
#endif
/* Extract best scores */
for (i=start; i<=end; i++)
{
if (score[i-start]>best_score[N-1])
{
for (j=0; j<N; j++)
{
if (score[i-start] > best_score[j])
{
for (k=N-1; k>j; k--)
{
best_score[k]=best_score[k-1];
pitch[k]=pitch[k-1];
}
best_score[j]=score[i-start];
pitch[j]=i;
break;
}
}
}
}
/* Compute open-loop gain */
if (gain)
{
for (j=0; j<N; j++)
{
spx_word16_t g;
i=pitch[j];
g = DIV32(corr[i-start], 10+SHR32(MULT16_16(spx_sqrt(e0),spx_sqrt(energy[i-start])),6));
/* FIXME: g = max(g,corr/energy) */
if (g<0)
g = 0;
gain[j]=g;
}
}
}
void open_loop_nbest_pitch(spx_word16_t* sw, int start, int end, int len, int* pitch, spx_word16_t* gain, int N, char* stack) {
int i, j, k;
VARDECL(spx_word32_t * best_score);
VARDECL(spx_word32_t * best_ener);
spx_word32_t e0;
VARDECL(spx_word32_t * corr);
#ifdef FIXED_POINT
/* In fixed-point, we need only one (temporary) array of 32-bit values and two (corr16, ener16)
arrays for (normalized) 16-bit values */
VARDECL(spx_word16_t * corr16);
VARDECL(spx_word16_t * ener16);
spx_word32_t* energy;
int cshift = 0, eshift = 0;
int scaledown = 0;
ALLOC(corr16, end - start + 1, spx_word16_t);
ALLOC(ener16, end - start + 1, spx_word16_t);
ALLOC(corr, end - start + 1, spx_word32_t);
energy = corr;
#else
/* In floating-point, we need to float arrays and no normalized copies */
VARDECL(spx_word32_t * energy);
spx_word16_t* corr16;
spx_word16_t* ener16;
ALLOC(energy, end - start + 2, spx_word32_t);
ALLOC(corr, end - start + 1, spx_word32_t);
corr16 = corr;
ener16 = energy;
#endif
ALLOC(best_score, N, spx_word32_t);
ALLOC(best_ener, N, spx_word32_t);
for (i = 0; i < N; i++) {
best_score[i] = -1;
best_ener[i] = 0;
pitch[i] = start;
}
#ifdef FIXED_POINT
for (i = -end; i < len; i++) {
if (ABS16(sw[i]) > 16383) {
scaledown = 1;
break;
}
}
/* If the weighted input is close to saturation, then we scale it down */
if (scaledown) {
for (i = -end; i < len; i++) {
sw[i] = SHR16(sw[i], 1);
}
}
#endif
energy[0] = inner_prod(sw - start, sw - start, len);
e0 = inner_prod(sw, sw, len);
for (i = start; i < end; i++) {
/* Update energy for next pitch*/
energy[i - start + 1] = SUB32(ADD32(energy[i - start], SHR32(MULT16_16(sw[-i - 1], sw[-i - 1]), 6)), SHR32(MULT16_16(sw[-i + len - 1], sw[-i + len - 1]), 6));
if (energy[i - start + 1] < 0)
energy[i - start + 1] = 0;
}
#ifdef FIXED_POINT
eshift = normalize16(energy, ener16, 32766, end - start + 1);
#endif
/* In fixed-point, this actually overrites the energy array (aliased to corr) */
pitch_xcorr(sw, sw - end, corr, len, end - start + 1, stack);
#ifdef FIXED_POINT
/* Normalize to 180 so we can square it and it still fits in 16 bits */
cshift = normalize16(corr, corr16, 180, end - start + 1);
/* If we scaled weighted input down, we need to scale it up again (OK, so we've just lost the LSB, who cares?) */
if (scaledown) {
for (i = -end; i < len; i++) {
sw[i] = SHL16(sw[i], 1);
}
}
#endif
/* Search for the best pitch prediction gain */
for (i = start; i <= end; i++) {
spx_word16_t tmp = MULT16_16_16(corr16[i - start], corr16[i - start]);
/* Instead of dividing the tmp by the energy, we multiply on the other side */
if (MULT16_16(tmp, best_ener[N - 1]) > MULT16_16(best_score[N - 1], ADD16(1, ener16[i - start]))) {
/* We can safely put it last and then check */
best_score[N - 1] = tmp;
best_ener[N - 1] = ener16[i - start] + 1;
pitch[N - 1] = i;
/* Check if it comes in front of others */
for (j = 0; j < N - 1; j++) {
if (MULT16_16(tmp, best_ener[j]) > MULT16_16(best_score[j], ADD16(1, ener16[i - start]))) {
for (k = N - 1; k > j; k--) {
best_score[k] = best_score[k - 1];
best_ener[k] = best_ener[k - 1];
pitch[k] = pitch[k - 1];
}
best_score[j] = tmp;
best_ener[j] = ener16[i - start] + 1;
pitch[j] = i;
break;
}
}
}
}
/* Compute open-loop gain if necessary */
if (gain) {
for (j = 0; j < N; j++) {
spx_word16_t g;
i = pitch[j];
g = DIV32(SHL32(EXTEND32(corr16[i - start]), cshift), 10 + SHR32(MULT16_16(spx_sqrt(e0), spx_sqrt(SHL32(EXTEND32(ener16[i - start]), eshift))), 6));
/* FIXME: g = max(g,corr/energy) */
if (g < 0)
g = 0;
gain[j] = g;
}
}
}
void open_loop_nbest_pitch(spx_word16_t *sw, int start, int end, int len, int *pitch, spx_word16_t *gain, int N, char *stack)
{
int i,j,k;
VARDECL(spx_word32_t *best_score);
VARDECL(spx_word32_t *best_ener);
spx_word32_t e0;
VARDECL(spx_word32_t *corr);
VARDECL(spx_word32_t *energy);
ALLOC(best_score, N, spx_word32_t);
ALLOC(best_ener, N, spx_word32_t);
ALLOC(corr, end-start+1, spx_word32_t);
ALLOC(energy, end-start+2, spx_word32_t);
for (i=0;i<N;i++)
{
best_score[i]=-1;
best_ener[i]=0;
pitch[i]=start;
}
energy[0]=inner_prod(sw-start, sw-start, len);
e0=inner_prod(sw, sw, len);
for (i=start;i<end;i++)
{
/* Update energy for next pitch*/
energy[i-start+1] = SUB32(ADD32(energy[i-start],SHR32(MULT16_16(sw[-i-1],sw[-i-1]),6)), SHR32(MULT16_16(sw[-i+len-1],sw[-i+len-1]),6));
if (energy[i-start+1] < 0)
energy[i-start+1] = 0;
}
pitch_xcorr(sw, sw-end, corr, len, end-start+1, stack);
/* FIXME: Fixed-point and floating-point code should be merged */
#ifdef FIXED_POINT
{
VARDECL(spx_word16_t *corr16);
VARDECL(spx_word16_t *ener16);
ALLOC(corr16, end-start+1, spx_word16_t);
ALLOC(ener16, end-start+1, spx_word16_t);
/* Normalize to 180 so we can square it and it still fits in 16 bits */
normalize16(corr, corr16, 180, end-start+1);
normalize16(energy, ener16, 180, end-start+1);
for (i=start;i<=end;i++)
{
spx_word16_t tmp = MULT16_16_16(corr16[i-start],corr16[i-start]);
/* Instead of dividing the tmp by the energy, we multiply on the other side */
if (MULT16_16(tmp,best_ener[N-1])>MULT16_16(best_score[N-1],ADD16(1,ener16[i-start])))
{
/* We can safely put it last and then check */
best_score[N-1]=tmp;
best_ener[N-1]=ener16[i-start]+1;
pitch[N-1]=i;
/* Check if it comes in front of others */
for (j=0;j<N-1;j++)
{
if (MULT16_16(tmp,best_ener[j])>MULT16_16(best_score[j],ADD16(1,ener16[i-start])))
{
for (k=N-1;k>j;k--)
{
best_score[k]=best_score[k-1];
best_ener[k]=best_ener[k-1];
pitch[k]=pitch[k-1];
}
best_score[j]=tmp;
best_ener[j]=ener16[i-start]+1;
pitch[j]=i;
break;
}
}
}
}
}
#else
for (i=start;i<=end;i++)
{
float tmp = corr[i-start]*corr[i-start];
if (tmp*best_ener[N-1]>best_score[N-1]*(1+energy[i-start]))
{
for (j=0;j<N;j++)
{
if (tmp*best_ener[j]>best_score[j]*(1+energy[i-start]))
{
for (k=N-1;k>j;k--)
{
best_score[k]=best_score[k-1];
best_ener[k]=best_ener[k-1];
pitch[k]=pitch[k-1];
}
best_score[j]=tmp;
best_ener[j]=energy[i-start]+1;
pitch[j]=i;
break;
}
}
}
}
#endif
/* Compute open-loop gain */
if (gain)
{
for (j=0;j<N;j++)
{
spx_word16_t g;
i=pitch[j];
g = DIV32(corr[i-start], 10+SHR32(MULT16_16(spx_sqrt(e0),spx_sqrt(energy[i-start])),6));
/* FIXME: g = max(g,corr/energy) */
if (g<0)
g = 0;
gain[j]=g;
}
}
}