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Only the (rising) overlap part of the window is stored now. No need to hold the

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zeros and ones (nor even the second half).
This commit is contained in:
Jean-Marc Valin 2008-03-03 13:49:20 +11:00
parent f28062fe6a
commit 3e08a88389
3 changed files with 10 additions and 27 deletions
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12
libcelt/modes.c
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@ -270,21 +270,15 @@ CELTMode *celt_mode_create(int Fs, int channels, int frame_size, int lookahead,
N4 = N/4;
mdct_init(&mode->mdct, 2*N);
mode->window = (celt_word16_t*)celt_alloc(2*N*sizeof(celt_word16_t));
mode->window = (celt_word16_t*)celt_alloc(mode->overlap*sizeof(celt_word16_t));
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));
mode->window[i] = 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)));
mode->window[i] = 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;
mode->marker_start = MODEVALID;
mode->marker_end = MODEVALID;