ref: 1a3ed79cbe547b53693bc79ca3a7af07fbb919cc
parent: bdb58836ce6382af858be92ec8bfe09a9d816c54
author: Jean-Marc Valin <[email protected]>
date: Sun Apr 20 16:39:53 EDT 2008
Saved two copies when computing MDCTs of mono signals
--- a/libcelt/celt.c
+++ b/libcelt/celt.c
@@ -181,10 +181,15 @@
}
CELT_MEMSET(x, 0, N4);
CELT_MEMSET(x+2*N-N4, 0, N4);
- mdct_forward(lookup, x, tmp);
- /* Interleaving the sub-frames */
- for (j=0;j<N;j++)
- out[C*j+c] = tmp[j];
+ if (C==1)
+ {+ mdct_forward(lookup, x, out);
+ } else {+ mdct_forward(lookup, x, tmp);
+ /* Interleaving the sub-frames */
+ for (j=0;j<N;j++)
+ out[C*j+c] = tmp[j];
+ }
}
RESTORE_STACK;
}
@@ -206,10 +211,14 @@
for (c=0;c<C;c++)
{int j;
- /* De-interleaving the sub-frames */
- for (j=0;j<N;j++)
- tmp[j] = X[C*j+c];
- mdct_backward(lookup, tmp, x);
+ if (C==1) {+ mdct_backward(lookup, X, x);
+ } else {+ /* 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
wanted to use them. */
for (j=0;j<overlap;j++)