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Removed a few int divisions from the intra prediction code.

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This commit is contained in:
Jean-Marc Valin 2008-03-27 14:18:28 +11:00
parent f958477a54
commit e28f25f0d1
2 changed files with 26 additions and 26 deletions
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44
libcelt/vq.c
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@ -270,7 +270,7 @@ void intra_prediction(celt_norm_t *x, celt_mask_t *W, int N, int K, celt_norm_t
int sign;
celt_word32_t E;
celt_word16_t pred_gain;
int max_pos = N0-N/B;
int max_pos = N0-N;
if (max_pos > MAX_INTRA)
max_pos = MAX_INTRA;
@ -283,9 +283,9 @@ void intra_prediction(celt_norm_t *x, celt_mask_t *W, int N, int K, celt_norm_t
complain to your compilor vendor */
j=0;
do {
xy = MAC16_16(xy, x[j], Y[i+N-j-1]);
yy = MAC16_16(yy, Y[i+N-j-1], Y[i+N-j-1]);
} while (++j<N); /* Promises we loop at least once */
xy = MAC16_16(xy, x[j], Y[i+B*N-j-1]);
yy = MAC16_16(yy, Y[i+B*N-j-1], Y[i+B*N-j-1]);
} while (++j<B*N); /* Promises we loop at least once */
/* Using xy^2/yy as the score but without having to do the division */
num = MULT16_16(ROUND16(xy,14),ROUND16(xy,14));
den = ROUND16(yy,14);
@ -311,9 +311,9 @@ void intra_prediction(celt_norm_t *x, celt_mask_t *W, int N, int K, celt_norm_t
/*printf ("%d %d ", sign, best);*/
ec_enc_bits(enc,sign,1);
if (max_pos == MAX_INTRA)
ec_enc_bits(enc,best/B,LOG_MAX_INTRA);
ec_enc_bits(enc,best,LOG_MAX_INTRA);
else
ec_enc_uint(enc,best/B,max_pos);
ec_enc_uint(enc,best,max_pos);
/*printf ("%d %f\n", best, best_score);*/
@ -322,21 +322,21 @@ void intra_prediction(celt_norm_t *x, celt_mask_t *W, int N, int K, celt_norm_t
else
pred_gain = pg[K];
E = EPSILON;
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
{
P[j] = s*Y[best+N-j-1];
P[j] = s*Y[best+B*N-j-1];
E = MAC16_16(E, P[j],P[j]);
}
/*pred_gain = pred_gain/sqrt(E);*/
pred_gain = MULT16_16_Q15(pred_gain,celt_rcp(SHL32(celt_sqrt(E),9)));
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
P[j] = PSHR32(MULT16_16(pred_gain, P[j]),8);
if (K>0)
{
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
x[j] -= P[j];
} else {
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
x[j] = P[j];
}
/*printf ("quant ");*/
@ -352,7 +352,7 @@ void intra_unquant(celt_norm_t *x, int N, int K, celt_norm_t *Y, celt_norm_t * r
int best;
celt_word32_t E;
celt_word16_t pred_gain;
int max_pos = N0-N/B;
int max_pos = N0-N;
if (max_pos > MAX_INTRA)
max_pos = MAX_INTRA;
@ -363,9 +363,9 @@ void intra_unquant(celt_norm_t *x, int N, int K, celt_norm_t *Y, celt_norm_t * r
s = -1;
if (max_pos == MAX_INTRA)
best = B*ec_dec_bits(dec, LOG_MAX_INTRA);
best = ec_dec_bits(dec, LOG_MAX_INTRA);
else
best = B*ec_dec_uint(dec, max_pos);
best = ec_dec_uint(dec, max_pos);
/*printf ("%d %d ", sign, best);*/
if (K>10)
@ -373,18 +373,18 @@ void intra_unquant(celt_norm_t *x, int N, int K, celt_norm_t *Y, celt_norm_t * r
else
pred_gain = pg[K];
E = EPSILON;
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
{
P[j] = s*Y[best+N-j-1];
P[j] = s*Y[best+B*N-j-1];
E = MAC16_16(E, P[j],P[j]);
}
/*pred_gain = pred_gain/sqrt(E);*/
pred_gain = MULT16_16_Q15(pred_gain,celt_rcp(SHL32(celt_sqrt(E),9)));
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
P[j] = PSHR32(MULT16_16(pred_gain, P[j]),8);
if (K==0)
{
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
x[j] = P[j];
}
}
@ -400,23 +400,23 @@ void intra_fold(celt_norm_t *x, int N, celt_norm_t *Y, celt_norm_t * restrict P,
{
for (i=0;i<B;i++)
{
for (j=0;j<N/B;j++)
for (j=0;j<N;j++)
{
P[j*B+i] = Y[(Nmax-N0-j-1)*B+i];
E += P[j*B+i]*P[j*B+i];
}
}
} else {
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
{
P[j] = Y[j];
E = MAC16_16(E, P[j],P[j]);
}
}
g = celt_rcp(SHL32(celt_sqrt(E),9));
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
P[j] = PSHR32(MULT16_16(g, P[j]),8);
for (j=0;j<N;j++)
for (j=0;j<B*N;j++)
x[j] = P[j];
}