wavGen.js

var WAVE={};
(function(){
function str16(x){return (x>15)?x.toString(16):"0"+x.toString(16);}
function shortToStr(x){return "%"+str16(x&0xff)+"%"+str16((x>>>8)&0xff);}
function intToStr(x){return "%"+str16(x&0xff)+"%"+str16((x>>>8)&0xff)+"%"+str16((x>>>16)&0xff)+"%"+str16((x>>>24)&0xff);}
WAVE.makeWavDecimal=function(channels,sampleFrequency)
{
	var str="data:audio/x-wav,%52%49%46%46"+
	intToStr(channels.length*2*channels[0].length+0x24)+
	"%57%41%56%45%66%6D%74%20"+
	intToStr(0x10)+
	shortToStr(1)+
	shortToStr(channels.length)+
	intToStr(sampleFrequency)+
	intToStr(channels.length*2*sampleFrequency)+
	shortToStr(2*channels.length)+
	shortToStr(0x10)+
	"%64%61%74%61"+
	intToStr(channels.length*2*channels[0].length);
	var l=channels[0].length;
	for(var i=0;i<l;i++)
	{
		for(var c=0;c<channels.length;c++)
		{
			str+=shortToStr(Math.round((channels[c][i]+1)/2*32767.5));
		}
	}
	return str;
};
WAVE.makeWav=function(channels,sampleFrequency)
{
	var str="data:audio/x-wav,%52%49%46%46"+
	intToStr(channels.length*2*channels[0].length+0x24)+
	"%57%41%56%45%66%6D%74%20"+
	intToStr(0x10)+
	shortToStr(1)+
	shortToStr(channels.length)+
	intToStr(sampleFrequency)+
	intToStr(channels.length*2*sampleFrequency)+
	shortToStr(2*channels.length)+
	shortToStr(0x10)+
	"%64%61%74%61"+
	intToStr(channels.length*2*channels[0].length);
	var l=channels[0].length;
	for(var i=0;i<l;i++)
	{
		for(var c=0;c<channels.length;c++)
		{
			str+=shortToStr(channels[c][i]);
		}
	}
	return str;
};
WAVE.makeWavFunc=function(f,duration,sampleFrequency)
{
	var nVals=duration*sampleFrequency;
	var str="data:audio/x-wav,%52%49%46%46"+
	intToStr(2*nVals+0x24)+
	"%57%41%56%45%66%6D%74%20"+
	intToStr(0x10)+
	shortToStr(1)+
	shortToStr(1)+
	intToStr(sampleFrequency)+
	intToStr(2*sampleFrequency)+
	shortToStr(2)+
	shortToStr(0x10)+
	"%64%61%74%61"+
	intToStr(2*nVals);
	for(var i=0;i<nVals;i++)
	{
		str+=shortToStr(Math.round(f(i)));
	}
	return str;
};
})();
function TestIt()
{
	var audio=document.createElement("audio");
	audio.src=WAVE.makeWavFunc(function(t){return w=t>>9,k=32,m=2048,a=1-t/m%1,d=(14*t*t^t)%m*a,y=[3,3,4.7,2][p=w/k&3]*t/4,h="IQNNNN!!]]!Q!IW]WQNN??!!W]WQNNN?".charCodeAt(w/2&15|p/3<<4)/33*t-t,s=y*.98%80+y%80+(w>>7&&a*((5*t%m*a&128)*(0x53232323>>w/4&1)+(d&127)*(0xa444c444>>w/4&1)*1.5+(d*w&1)+(h%k+h*1.99%k+h*.49%k+h*.97%k-64)*(4-a-a))),s*s>>14?127:s;},60,8000);
	document.body.appendChild(audio);
	audio.play();
}
TestIt();