JS1k, the yearly JS code golfing competition

JS1k: The JavaScript code golfing competition

2010 - The Original

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A very simple synthesizer playing "The Drunken Sailor". This is not so much a demo as it is a component for other demos. It is not minified, except at the most basic levels and the notes notation isn'…

Author:
Hans Schmucker
Twitter:
@
GitHub:
Facebook:
Google+:
+
Reddit:
/r/
Pouet:
Website: 
tapper-ware.net
Compo:
classic
Demo link:
https://js1k.com/2010-first/demo/312
Shortlink:
https://js1k.com/312
Blog post:
please update here!
Bytes:
1000
Chars:
1000
Submission
C=String.fromCharCode;function Z(C,N,O,i){O="";for(i=0;i<N;i++) O+=C;return O;}function G(T,N,F,P,H,W,E,R){N/=12,F=N*N*440,S=44100,T=T*S|0,L=S/F/2|0;P=Z("!",L);H=Z("}",L);E=Z(C(0),100);for(W="";W.length<T-100;W+=P+H);return W.substr(0,T-101)+E;}M=[[.4,24],[.2,24],[.2,24],[.4,24],[.2,24],[.2,24],[.4,24],[.4,17],[.4,20],[.4,24],[.4,22],[.2,22],[.2,22],[.4,22],[.2,22],[.2,22],[.4,22],[.4,15],[.4,19],[.4,22],[.4,24],[.2,24],[.2,24],[.4,24],[.2,24],[.2,24],[.4,24],[.4,26],[.4,27],[.4,29],[.4,27],[.4,24],[.4,22],[.4,19],[.8,17],[.8,17],[.8,24],[.6,24],[.2,24],[.4,24],[.4,17],[.4,20],[.4,24],[.8,22],[.6,22],[.2,22],[.4,22],[.4,15],[.4,19],[.4,22] ,[.8,24],[.6,24],[.2,24],[.4,24],[.4,26],[.4,27],[.4,29],[.4,27],[.4,24],[.4,22],[.4,19],[.8,17],[.8,17]];Y={};X="";for(var j=0;j<M.length;j++){V=M[j];if(!Y[V])Y[V]=G.apply(0,V);X+=Y[V];}T=X.length;Audio("data:audio/wav;base64,UklGRmisAABXQVZFZm10IBAAAAABAAEARKwAAESsAAABAAgAZGF0"+btoa("a"+C(T&0xff)+C(T>>8&0xff)+C(T>>16&0xff)+C(T>>24&0xff)+X)).play();
Description
A very simple synthesizer playing "The Drunken Sailor". This is not so much a demo as it is a component for other demos. It is not minified, except at the most basic levels and the notes notation isn't at all (the song takes up about half of the filesize right now). Notes are given as half tones from A+length in seconds. With optimizations you should be able to get everything into ~400 bytes. Permission is given to use this in JS1K demo submissions (ask me if you want to use it anywhere else).
Base64 encoded
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
Original source
function repeatChar(character,length){
	var output="";
	for(i=0;i<length;i++)
		output+=character;
	return output;
}

function generateSound(lengthSeconds,halfToneFromA,F,P,H,W,E,R){
	var octave=halfToneFromA/12;
	var frequency=octave*octave*440;
	
	var lengthSamples=lengthSeconds*44100|0;
	var samplePortionLength=44100/frequency/2|0;
	var lowSamplePortion=repeatChar("!",samplePortionLength);
	var highSamplePortion=repeatChar("}",samplePortionLength);
	var spacerSample=repeatChar(String.fromCharCode(0),100);
	
	
	for(var output="";output.length<lengthSamples-100;output+=lowSamplePortion+highSamplePortion);
	return output.substr(0,lengthSamples-101)+E;
}

var notes=[[.4,24],[.2,24],[.2,24],[.4,24],[.2,24],[.2,24],[.4,24],[.4,17],[.4,20],[.4,24],[.4,22],[.2,22],[.2,22],[.4,22],[.2,22],[.2,22],[.4,22],[.4,15],[.4,19],[.4,22],[.4,24],[.2,24],[.2,24],[.4,24],[.2,24],[.2,24],[.4,24],[.4,26],[.4,27],[.4,29],[.4,27],[.4,24],[.4,22],[.4,19],[.8,17],[.8,17],[.8,24],[.6,24],[.2,24],[.4,24],[.4,17],[.4,20],[.4,24],[.8,22],[.6,22],[.2,22],[.4,22],[.4,15],[.4,19],[.4,22] ,[.8,24],[.6,24],[.2,24],[.4,24],[.4,26],[.4,27],[.4,29],[.4,27],[.4,24],[.4,22],[.4,19],[.8,17],[.8,17]];

sampleCache={};
rawData="";

for(var j=0;j<notes.length;j++){
	if(!sampleCache[notes[j]])
		sampleCache[notes[j]]=generateSound.apply(0,notes[j]);

	rawData+=sampleCache[notes[j]];
}

Audio(
	"data:audio/wav;base64,UklGRmisAABXQVZFZm10IBAAAAABAAEARKwAAESsAAABAAgAZGF0"
	+btoa(
		"a"
		+String.fromCharCode(rawData.length&0xff)+String.fromCharCode(rawData.length>>8&0xff)+String.fromCharCode(rawData.length>>16&0xff)+String.fromCharCode(rawData.length>>24&0xff)
		+rawData
	)
).play();