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PCM tone generator

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?


#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;

}

Name: Anonymous 2011-10-30 14:58

What the fuckkkkkk, when I run this it outputs a sine wave in the console, but when I change it to output x raw it's a buzzing noise



#include <stdio.h>
#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);

                        for(s=0; s<x / 5; s++) putchar('*');
                        putchar('\n');      
                }
        }

        return 0;
}

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