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Don't bother multiplying when the window's value is one or zero

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This commit is contained in:
Jean-Marc Valin 2008-03-03 13:24:01 +11:00
parent 227ad2f82d
commit f28062fe6a
2 changed files with 48 additions and 11 deletions
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6
libcelt/modes.c
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@ -274,9 +274,15 @@ CELTMode *celt_mode_create(int Fs, int channels, int frame_size, int lookahead,
for (i=0;i<2*N;i++)
mode->window[i] = 0;
#ifndef FIXED_POINT
for (i=0;i<mode->overlap;i++)
mode->window[N4+i] = mode->window[2*N-N4-i-1]
= Q15ONE*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap));
#else
for (i=0;i<mode->overlap;i++)
mode->window[N4+i] = mode->window[2*N-N4-i-1]
= MIN32(32767,32768.*sin(.5*M_PI* sin(.5*M_PI*(i+.5)/mode->overlap) * sin(.5*M_PI*(i+.5)/mode->overlap)));
#endif
for (i=0;i<N2;i++)
mode->window[N-N4+i] = Q15ONE;