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/*
wrapper for window functions
Copyright (C) 2001 Martin Vogt
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published by
the Free Software Foundation.
For more information look at the file COPYRIGHT in this package
*/
#include "mpegsound.h"
static int windowInit=0;
ATTR_ALIGN(64) REAL win[4][36];
ATTR_ALIGN(64) REAL winINV[4][36];
void initialize_win() {
if (windowInit==true) {
return;
}
windowInit=true;
int i;
for(i=0;i<18;i++) {
/*
win[0][i]=win[1][i]=0.5*sin(PI_72*(double)(2*i+1))/
cos(PI_72*(double)(2*i+19));
*/
win[0][i]=win[1][i]=0.5*sin(PI_72*(double)(2*(i+0)+1))/cos(MY_PI * (double) (2*(i+0) +19) / 72.0 );
win[0][i+18] = win[3][i+18] = 0.5 * sin( MY_PI / 72.0 * (double) (2*(i+18)+1) ) / cos ( MY_PI * (double) (2*(i+18)+19) / 72.0 );
}
/*
for(;i<36;i++) {
win[0][i]=win[3][i]=0.5*sin(PI_72*(double)(2*i+1))/cos(PI_72*(double)(2*i+19));
}
*/
for(i=0;i<6;i++) {
win[1][i+18]=0.5/cos(MY_PI*(double)(2*(i+18)+19)/72.0);
win[3][i+12]=0.5/cos(MY_PI*(double)(2*(i+12)+19)/72.0);
win[1][i+24]=0.5*sin(PI_24*(double)(2*i+13))/cos(MY_PI*(double)(2*(i+24)+19)/72.0);
win[1][i+30]=win[3][i]=0.0;
win[3][i+6 ]=0.5*sin(PI_24*(double)(2*i+1))/cos(MY_PI*(double)(2*(i+6)+19)/72.0);
}
for(i=0;i<12;i++)
win[2][i]=0.5*sin(PI_24*(double)(2*i+1))/cos(MY_PI*(double)(2*i+7)/24.0);
int j;
for(j=0;j<4;j++) {
int len[4] = { 36,36,12,36 };
for(i=0;i<len[j];i+=2)
winINV[j][i] = + win[j][i];
for(i=1;i<len[j];i+=2)
winINV[j][i] = - win[j][i];
}
}
inline REAL* getSplayWindow(int nr) { return win[nr]; }
inline REAL* getSplayWindowINV(int nr) { return winINV[nr]; }
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