bytemedia

2022-02-06.c (943B)

#define _XOPEN_SOURCE 700
#include <stdio.h>
#include <inttypes.h> // uint32_t
#include <math.h> // sinf(), M_PI, pow()
#include "au.h"
int
main(void)
{
	// Use AU defaults
	struct au_header header = {
		.offset = 24, // no-annotation, in octets
		.length = 0,
		.encoding = AU_ENCODING_8B_LPCM,
		.samplerate = 44000, // Hz
		.channels = 1
	};
	char buf[4];
	int32_t t;
	// fd 1 is stdout
	write_au_header(1, &header);
	//for(t = 0;;t++) {
	for(t = 0;t<header.samplerate*60;t++) {
		float tune;
		int freq = 140;
		//int freq = 180 + (t / (header.samplerate / 666) % 10);
		int phase = t >> 5;
		int volume = 20;
		tune =  sinf(t * 2*M_PI * (freq + ((t>>3) % 300))/header.samplerate) * volume/9;
		//tune += sinf(t * 2*M_PI * (freq + ((t>>5) % 600))/header.samplerate) * volume/3;
		tune += sinf(t * 2*M_PI * (freq + ((713&t>>(t/header.samplerate/3)) % 2000))/header.samplerate) * volume/2;
		putchar((uint8_t)(tune));
	}
	return 0;
}