JS1k 2015 - 2329 - Details - A hyped JavaScript golfing competition

Author:

Joseph Culbert

Twitter:

GitHub:

neckro

Facebook:

Google+:

Reddit:

/r/

Pouet:

Website:

mental.decay.us

Compo:

pure

Demo link:

https://js1k.com/2015-hypetrain/demo/2329

Shortlink:

https://js1k.com/2329

Blog post:

please update here!

Bytes:

1024

Chars:

1024

Submission

_=' e,ng=1!g?(2g*=2,2!g)/8,v=0](g),3v*=3!n,v):0}r=8e3,O={s#Mh.s(6.3*t/r*f)sqr#t%p<p/2?1:$saw#t%p/p/.5$"},b=prec~eU"l: djput!^=5,hUc=0;cz<16;c>9?c#0Kc,x=$;xz<4;if(e=,e" K[c<5?"out"#oscPvolPfPfmPam"][x]+": x)i=put@;else{i=select@;e  O)iopt`ne}ij311370470523Y,..,,,.,7,,-.1][5*c+x-5]||"d.push(bi}bU4==c&&hr}addEv~Listerkeydown(eif(n="ZSXDCVGBHNJM".dexOf(	e.keyCode,f=256*2,1/12),n),n>$oj!c=16n=5*c-5,o[c]jeval((v(fp=r/f;v*+O[]+@}})@()];a="t=0;t<r*^;tzv=0,c=5v+=c,f)/4;a+=	v>1?255:v<$?0:127*(v+1}new Aud`da:aud`/wav;base64,KbtoaRIFF_oO_WAVEfmt KobEAEQBAHwQB8AEAC@+"daKa.play()}});docum~.creeElem~d[zn].nerHTML=Yfunct`no[e][,eva)||0	Strg.fromCharCode("Mh.pow(for(.valuelabelP,return .appdChild(){in))en("1,atAAb;--c;)"sqrl(!],#:"$-1@")K"+P"Ur,Y,5,6,^d[0]`ioj=[z++~t]&&(';for(Y in $='~zj`^YUPK@$#!	')with(_.split($[Y]))_=join(pop());eval(_)

Description

Play notes with bottom row of keyboard. Try "f" in freq field. Freq field is eval'd, so you can use a formula here. The var "f" represents the freq of the key that was pressed. A numeric value, like in the "train horn" default, will result in a fixed pitch for every key. "fm" and "am" fields determine which channel to get the corresponding modulation from. Watch out for infinite loops! Channels 1-4 are output, although it's possible to use an output channel as an auxiliary oscillator if you're careful about loops. For FM oscillators, the volume determines the modulation width. The "black keys" on the second row (sdghj) are also available. Feature, not bug: If a note key is pressed while the previous note is still generating, the two notes will play simultaneously. This can be exploited to play chords. Other tips: Try layering sounds with one channel at "f", another at "f*2", etc. Use AM modulation with low-frequency sines to create a fade in/out effect, like in the default setting. Try AM modulating an FM channel for fancy effects. Generally, you'll get better results using multiples of "f" in your FM/AM channels instead of fixed values. Github repository: https://github.com/neckro/js1k-2015-synth

Base64 encoded

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

Original source

/* jshint evil: true, loopfunc: true, elision: true, undef: false, -W008 */

// Sampling rate
r=8000;

// Oscillators
// t = curr time (samples)
// f = frequency (hz)
// r = sample rate (hz)
// p = cycle period (samples)
O={
	'sin': 'Math.sin(6.3*t/r*f)',
//	'cos': 'Math.cos(6.3*t/r*f)',  // ~12 bytes
	'sqr': 't%p<p/2?1:-1',
//	'saw': 't%p/p',  // not as loud
	'saw': 't%p/p/.5-1'
};

// Draw interface
b=b.appendChild(document.createElement('pre')).appendChild(document.createElement('center'));
// init form
b.appendChild(document.createElement('label')).innerHTML='len: ';
d = [b.appendChild(document.createElement('input'))];
d[0].value = 5;  // default len
b.appendChild(document.createElement('hr'));

for (c=0; c++<16;) {
	b.appendChild(document.createElement('label')).innerHTML = c>9?c:'0'+c;
	for (x=-1; x++<4;) {
		e=b.appendChild(document.createElement('label'));
		e.innerHTML = ' '+[c<5?'out':'osc','vol','f','fm','am'][x]+': ';
		if (x) {
			i=document.createElement('input');
//			if(x>2) i.type='number';  // ~21 bytes
		} else {
			i=document.createElement('select');
			for (e in O) {
				i.appendChild(document.createElement('option')).innerHTML = e;
			}
		}
		// train horn!
		i.value = ['sqr',1,311,5,6,'sqr',1,370,5,6,'sqr',1,470,5,6,'sqr',1,523,5,6,,.1,.1,,,,1,.1,,7,,-1,.1][5*c+x-5]||'';
		// fm synthesis test
//		i.value = [,.3,'f',5,,'saw',2,'f/2',,6,,1,,,,,1,,,,,1,'f/4',,,'saw',1,'f/2',,7,,1,1][5*c+x-5]||'';
		d.push(b.appendChild(i));
	}
	b.appendChild(document.createElement('br'));
	if (c==4) b.appendChild(document.createElement('hr')); // ~11 bytes
}

// Get sample for channel c at time t with main freq f
function y(c, f){
	// initial freq
	g = o[c][1];
	if (!g) return 0;
	// FM: modulate freq by osc channel, if any
	if (o[c][2]) g *= Math.pow(2, y(o[c][2], g)/8);
	// run current vol oscillator
	v = o[c][0](g);
	// AM: attenuate vol by osc channel, if any
	if (o[c][3]) v *= y(o[c][3],f);
	return v;
}

addEventListener('keydown', function(e) {
	// Chromatic scale, bottom row of keyboard, middle row is "black keys"
	n = 'ZSXDCVGBHNJM'.indexOf(String.fromCharCode(e.keyCode));
	f = 256*Math.pow(Math.pow(2, 1/12), n);
	if (n > -1) {
		// Prepare oscillators
		o = [];
		for(c=16; --c;) {
			n = 5*c-5;
			o[c] = [
				eval('(function(v){return function(f){p=r/f;return v*('+O[d[++n].value]+')}})')(d[++n].value),
				eval(d[++n].value)||0,
				eval(d[++n].value)||0,
				eval(d[++n].value)||0
			];
		}

		// Compute all oscillator params
		a = '';
		for (t=0; t<r*d[0].value; t++){
			v = 0;
			// Mix samples, divide result by # of channels (4)
			for (c=5; --c;) v += y(c,f)/4;
			a += String.fromCharCode(v>1?255:v<-1?0:(v+1)*127);
		}
		new Audio('data:audio/wav;base64,'+btoa('RIFF_oO_WAVEfmt '+atob('EAAAAAEAAQBAHwAAQB8AAAEACAA')+'data'+a)).play();
	}
});

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1k FM Synthesizer