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Changed the rules for using the pulse spreading. It should be used less often

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and mainly in the mid-range.
This commit is contained in:
Jean-Marc Valin 2008-03-28 17:59:36 +11:00
parent 9c50c6bc68
commit ae76e553db
1 changed files with 13 additions and 7 deletions
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20
libcelt/bands.c
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@ -331,11 +331,15 @@ void quant_bands(const CELTMode *m, celt_norm_t * restrict X, celt_norm_t *P, ce
if (q > 0) if (q > 0)
{ {
int nb_rotations = (B*(eBands[i+1]-eBands[i])+4*q)/(8*q); int nb_rotations = q <= 2*B ? 2*B/q : 0;
exp_rotation(P+B*eBands[i], B*(eBands[i+1]-eBands[i]), -1, B, nb_rotations); if (nb_rotations != 0)
exp_rotation(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), -1, B, nb_rotations); {
exp_rotation(P+B*eBands[i], B*(eBands[i+1]-eBands[i]), -1, B, nb_rotations);
exp_rotation(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), -1, B, nb_rotations);
}
alg_quant(X+B*eBands[i], W+B*eBands[i], B*(eBands[i+1]-eBands[i]), q, P+B*eBands[i], enc); alg_quant(X+B*eBands[i], W+B*eBands[i], B*(eBands[i+1]-eBands[i]), q, P+B*eBands[i], enc);
exp_rotation(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), 1, B, nb_rotations); if (nb_rotations != 0)
exp_rotation(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), 1, B, nb_rotations);
} }
for (j=B*eBands[i];j<B*eBands[i+1];j++) for (j=B*eBands[i];j<B*eBands[i+1];j++)
norm[j] = MULT16_16_Q15(n,X[j]); norm[j] = MULT16_16_Q15(n,X[j]);
@ -388,10 +392,12 @@ void unquant_bands(const CELTMode *m, celt_norm_t * restrict X, celt_norm_t *P,
if (q > 0) if (q > 0)
{ {
int nb_rotations = (B*(eBands[i+1]-eBands[i])+4*q)/(8*q); int nb_rotations = q <= 2*B ? 2*B/q : 0;
exp_rotation(P+B*eBands[i], B*(eBands[i+1]-eBands[i]), -1, B, nb_rotations); if (nb_rotations != 0)
exp_rotation(P+B*eBands[i], B*(eBands[i+1]-eBands[i]), -1, B, nb_rotations);
alg_unquant(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), q, P+B*eBands[i], dec); alg_unquant(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), q, P+B*eBands[i], dec);
exp_rotation(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), 1, B, nb_rotations); if (nb_rotations != 0)
exp_rotation(X+B*eBands[i], B*(eBands[i+1]-eBands[i]), 1, B, nb_rotations);
} }
for (j=B*eBands[i];j<B*eBands[i+1];j++) for (j=B*eBands[i];j<B*eBands[i+1];j++)
norm[j] = MULT16_16_Q15(n,X[j]); norm[j] = MULT16_16_Q15(n,X[j]);