Name: Anonymous 2011-10-30 12:52
Hey /prog/
I'm trying to teach myself how to generate PCM audio in C, and I can't figure out why this isn't generating a clear sine wave signal when I pipe it to aplay. Any ideas?
I'm trying to teach myself how to generate PCM audio in C, and I can't figure out why this isn't generating a clear sine wave signal when I pipe it to aplay. Any ideas?
#include <math.h>
#define MIDDLE_C 261.626
#define HZ 8000.0
#define ONE_CYCLE 2.0
#define PI 3.14159265
int main() {
float frames = HZ / MIDDLE_C;
float i;
float n;
unsigned int x;
int s, v;
for(v=0; v<MIDDLE_C; v++) {
for(i=0; i<frames; i++) {
n = (1 + sin((i / frames) * (PI * 2))) / 2;
x = (int)round(0xFF * n);
putchar(x);
}
}
return 0;
}