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