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