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/*
* sine.c
*
* @copyright (C) 2021 SML# Development Team.
* @author UENO Katsuhiro
* @version $Id: sine.c,v 1.2 2007/04/02 09:42:29 katsu Exp $
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#define PI 3.141592653549793238462643383279
#define SAMPLE_RATE 44100
int main(int argc, char **argv)
{
int hz = 441.0;
int r = 0;
int n;
short sample[2];
if (argc > 1)
hz = strtol(argv[1], NULL, 10);
for (;;) {
n = sin(hz * 2 * PI * r / SAMPLE_RATE) * 32768 * 0.8;
if (n > SHRT_MAX) n = SHRT_MAX;
if (n < SHRT_MIN) n = SHRT_MIN;
sample[0] = n;
sample[1] = n;
fwrite(sample, sizeof(short), 2, stdout);
r++;
if (r > 44100) r = 0;
}
return 0;
}
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