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Doing stereo mixing adaptively based on amplitude difference.

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This commit is contained in:
Jean-Marc Valin 2008-01-11 14:02:07 +11:00
parent a2482aceb4
commit 45018cbfa2
3 changed files with 46 additions and 6 deletions
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21
libcelt/celt.c
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@ -309,16 +309,22 @@ int celt_encode(CELTEncoder *st, short *pcm)
normalise_bands(st->mode, P, bandEp);
}
quant_energy(st->mode, bandE, st->oldBandE, &st->enc);
if (C==2)
{
haar1(X, B*N*C, 1);
haar1(P, B*N*C, 1);
stereo_mix(st->mode, X, bandE, 1);
stereo_mix(st->mode, P, bandE, 1);
//haar1(X, B*N*C, 1);
//haar1(P, B*N*C, 1);
}
/* Simulates intensity stereo */
//for (i=30;i<N*B;i++)
// X[i*C+1] = P[i*C+1] = 0;
/* Get a tiny bit more frequency resolution and prevent unstable energy when quantising */
time_dct(X, N, B, C);
time_dct(P, N, B, C);
quant_energy(st->mode, bandE, st->oldBandE, &st->enc);
/* Pitch prediction */
compute_pitch_gain(st->mode, X, P, gains, bandE);
@ -339,7 +345,8 @@ int celt_encode(CELTEncoder *st, short *pcm)
time_idct(X, N, B, C);
if (C==2)
haar1(X, B*N*C, 1);
//haar1(X, B*N*C, 1);
stereo_mix(st->mode, X, bandE, -1);
renormalise_bands(st->mode, X);
/* Synthesis */
@ -549,7 +556,8 @@ int celt_decode(CELTDecoder *st, char *data, int len, short *pcm)
}
if (C==2)
haar1(P, B*N*C, 1);
//haar1(P, B*N*C, 1);
stereo_mix(st->mode, P, bandE, 1);
time_dct(P, N, B, C);
/* Get the pitch gains */
@ -563,7 +571,8 @@ int celt_decode(CELTDecoder *st, char *data, int len, short *pcm)
time_idct(X, N, B, C);
if (C==2)
haar1(X, B*N*C, 1);
//haar1(X, B*N*C, 1);
stereo_mix(st->mode, X, bandE, -1);
renormalise_bands(st->mode, X);