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- #include <stdlib.h>
- #include <math.h>
- #include "os.h"
- #include "misc.h"
- float *_vorbis_window(int type, int window,int left,int right){
- float *ret=calloc(window,sizeof(float));
- switch(type){
- case 0:
-
- {
- int leftbegin=window/4-left/2;
- int rightbegin=window-window/4-right/2;
- int i;
-
- for(i=0;i<left;i++){
- float x=(i+.5)/left*M_PI/2.;
- x=sin(x);
- x*=x;
- x*=M_PI/2.;
- x=sin(x);
- ret[i+leftbegin]=x;
- }
-
- for(i=leftbegin+left;i<rightbegin;i++)
- ret[i]=1.;
-
- for(i=0;i<right;i++){
- float x=(right-i-.5)/right*M_PI/2.;
- x=sin(x);
- x*=x;
- x*=M_PI/2.;
- x=sin(x);
- ret[i+rightbegin]=x;
- }
- }
- break;
- default:
- free(ret);
- return(NULL);
- }
- return(ret);
- }
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