bytemedia

battery_low.c (1091B)

#define _XOPEN_SOURCE 700
#include <stdio.h>
#include <inttypes.h> // uint32_t
#include "au.h"
#include "misc.h"
#include "instruments.h"
#include "effects.h"
void
note(int dur, struct au_header *header, int hertz, float volume) {
	char buf[4];
	for(int t = 0;t<dur;t++) {
		//float tune = pure_sin(header, hertz, t);
		float tune = clarinet(header, hertz, t);
		float vol = crossfade(dur, t, volume);
		putchar((uint8_t)(tune * vol));
	}
}
int
main(void)
{
	// Use AU defaults
	struct au_header header = {
		.offset = 24, // no-annotation, in octets
		.length = 0xFFFFFFFF, // unknown data size
		.encoding = AU_ENCODING_8B_LPCM,
		.samplerate = 48000, // Hz
		.channels = 1
	};
	header.length = header.samplerate;
	// fd 1 is stdout
	write_au_header(1, &header);
	int volume = 60;
	int ref_tune = 440;
	note(header.samplerate/4, &header, note_to_hertz(ref_tune, 2-8), volume);
	note(header.samplerate/4, &header, note_to_hertz(ref_tune, 3-8), volume*0.9);
	note(header.samplerate/4, &header, note_to_hertz(ref_tune, 0-8), volume*0.7);
	silence(header.samplerate/4);
	return 0;
}