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Saved two copies when computing MDCTs of mono signals

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This commit is contained in:
Jean-Marc Valin 2008-04-20 20:39:53 +10:00
parent bdb58836ce
commit 1a3ed79cbe
1 changed files with 17 additions and 8 deletions
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25
libcelt/celt.c
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@ -181,10 +181,15 @@ static void compute_mdcts(const CELTMode *mode, const celt_word16_t * restrict w
} }
CELT_MEMSET(x, 0, N4); CELT_MEMSET(x, 0, N4);
CELT_MEMSET(x+2*N-N4, 0, N4); CELT_MEMSET(x+2*N-N4, 0, N4);
mdct_forward(lookup, x, tmp); if (C==1)
/* Interleaving the sub-frames */ {
for (j=0;j<N;j++) mdct_forward(lookup, x, out);
out[C*j+c] = tmp[j]; } else {
mdct_forward(lookup, x, tmp);
/* Interleaving the sub-frames */
for (j=0;j<N;j++)
out[C*j+c] = tmp[j];
}
} }
RESTORE_STACK; RESTORE_STACK;
} }
@ -206,10 +211,14 @@ static void compute_inv_mdcts(const CELTMode *mode, const celt_word16_t * restri
for (c=0;c<C;c++) for (c=0;c<C;c++)
{ {
int j; int j;
/* De-interleaving the sub-frames */ if (C==1) {
for (j=0;j<N;j++) mdct_backward(lookup, X, x);
tmp[j] = X[C*j+c]; } else {
mdct_backward(lookup, tmp, x); /* De-interleaving the sub-frames */
for (j=0;j<N;j++)
tmp[j] = X[C*j+c];
mdct_backward(lookup, tmp, x);
}
/* The first and last part would need to be set to zero if we actually /* The first and last part would need to be set to zero if we actually
wanted to use them. */ wanted to use them. */
for (j=0;j<overlap;j++) for (j=0;j<overlap;j++)