bouncy-egyptian-song.js

// it's a thousand degrees and I can't sleep, it's thursday,
// i'm feeling saucy and so I decided to make a song out of math.
//
// super, super high def audio (176,400 Hz = HDCD)
//
// to run:
// - install ffmpeg (`brew install ffmpeg` or `apt install ffmpeg`)
// - run (without backticks) `node bouncy-egyptian-song.js | ffplay -f f64le -ar 176400 -`
//                                                                                      ^
//                                                         this hyphen is required! > > ^
S = Math.sin;
N = Math.random;

function bouncyEgyptianSong(t) {
  return Math.min(1,(1/17)*(((S(t)+1)/4+0.5)*S(t*[1000,0,1000,0,1400,1800,0,900][Math.floor(t*8)%8])+(N()*0.15*(1-Math.pow((t*8)%1,-1)))+(S(t*390)*(1-Math.pow((t*8)%1,-1))*[4,0,0,1,4,0,1,0.5][Math.floor(t*8)%8])+(S(t*5200)*[0,0,1,0,1,0,0,0,1,0,1,0,0,0,1,0][Math.floor(t*16)%16]*([1,0][Math.floor(t*16%2)]))+(S(t*5140)*Math.sin(t*16)%16*0.2)+(N()*(Math.floor(t*4%2)==1?5:0)*Math.pow(1-((t*4)%1),10))+((n=>Math.round(S(t*(2600+n)))+Math.round(S(t*(2640+n))))([0,0,0,100,400,0,0,100,0,0,-440,0,-540,0,-750,0][Math.floor(t*4)%16])*(1-Math.pow(t*4%1,9))*1.2*[1,0.2,0,0.05][Math.floor(t*32)%4]*(0.25+Math.floor(t*8%4)))+(S(t*[480,250,250,250,250,250,450,250][Math.floor(t*8)%8])*3*(1-Math.pow(t*8%1,2)))))
}

bufferSize = 48000; //samples
rate = 176400; //sample rate

buffer = new Buffer(bufferSize * 8);

sampleLength = 1000 / rate / 1000;
time = 0.0;

function tick() {
	for (i = 0; i < bufferSize; i++) {
		offset = i * 8;
		buffer.writeDoubleLE(bouncyEgyptianSong(time)||0.0, offset);
		time += sampleLength;
	}

	process.stdout.write(buffer);
}

setInterval(tick, 240);