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Allowing to add pulses on top of intra-band prediction

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This commit is contained in:
Jean-Marc Valin 2007-12-03 15:24:11 +11:00
parent 50d1116883
commit 25298f296a
2 changed files with 39 additions and 13 deletions
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36
libcelt/vq.c
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@ -219,6 +219,8 @@ void noise_quant(float *x, int N, int K, float *p)
}
}
static const float pg[5] = {1.f, .82f, .75f, 0.7f, 0.6f};
/* Finds the right offset into Y and copy it */
void copy_quant(float *x, int N, int K, float *Y, int B, int N0)
{
@ -249,13 +251,33 @@ void copy_quant(float *x, int N, int K, float *Y, int B, int N0)
}
}
//printf ("%d %f\n", best, best_score);
E = 1e-10;
for (j=0;j<N;j++)
if (K==0)
{
x[j] = s*Y[best+j];
E += x[j]*x[j];
E = 1e-10;
for (j=0;j<N;j++)
{
x[j] = s*Y[best+j];
E += x[j]*x[j];
}
E = 1/sqrt(E);
for (j=0;j<N;j++)
x[j] *= E;
} else {
float P[N];
float pred_gain;
if (K>4)
pred_gain = .5;
else
pred_gain = pg[K];
E = 1e-10;
for (j=0;j<N;j++)
{
P[j] = s*Y[best+j];
E += P[j]*P[j];
}
E = .8/sqrt(E);
for (j=0;j<N;j++)
P[j] *= E;
alg_quant2(x, N, K, P);
}
E = 1/sqrt(E);
for (j=0;j<N;j++)
x[j] *= E;
}