55 lines
1,013 B
C
55 lines
1,013 B
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <string.h>
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void usage(){
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fprintf(stderr,"tone <frequency_Hz>,[<amplitude>] [<frequency_Hz>,[<amplitude>]...]\n");
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exit(1);
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}
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int main (int argc,char *argv[]){
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int i,j;
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double *f;
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double *amp;
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if(argc<2)usage();
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f=alloca(sizeof(*f)*(argc-1));
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amp=alloca(sizeof(*amp)*(argc-1));
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i=0;
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while(argv[i+1]){
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char *pos=strchr(argv[i+1],',');
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f[i]=atof(argv[i+1]);
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if(pos)
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amp[i]=atof(pos+1)*32767.f;
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else
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amp[i]=32767.f;
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fprintf(stderr,"%g Hz, %g amp\n",f[i],amp[i]);
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i++;
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}
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for(i=0;i<44100*10;i++){
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float val=0;
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int ival;
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for(j=0;j<argc-1;j++)
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val+=amp[j]*sin(i/44100.f*f[j]*2*M_PI);
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ival=rint(val);
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if(ival>32767.f)ival=32767.f;
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if(ival<-32768.f)ival=-32768.f;
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fprintf(stdout,"%c%c%c%c",
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(char)(ival&0xff),
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(char)((ival>>8)&0xff),
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(char)(ival&0xff),
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(char)((ival>>8)&0xff));
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}
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return(0);
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}
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