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nyan.js
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nyan.js
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var Nyan = (function(ctx) {
var failed = false;
var bufs = [];
var load = (function() {
var n=0;
return function(i, url, count, cb) {
{
var request = new XMLHttpRequest();
request.open("GET", url, true);
request.responseType = "arraybuffer";
request.onload = function()
{
ctx.decodeAudioData(request.response, function(buffer)
{
bufs[i] = buffer;
if (++n == count) {
inited = true;
cb&&cb();
}
}, function(e){failed = true;});
};
request.onerror = function() { failed = true; };
request.send();
}
}
})();
function init() {
var files = [];
for (var i=0; i<10; i++) files[i] = 'nyan/'+String.fromCharCode(i+97)+'.opus';
for (var i=0; i<files.length; i++) {
load(i, files[i], files.length, wantstart?start:null);
}
}
var seq = [ 0,1,2,1,4,5,6,7,6,8,9,5,6,7,6,8,3 ];
var seqptr = 0;
var last;
var dst;
var inited = false;
var wantstart = false;
function start() {
if (failed) {
console.log("NYAN FAIL");
return;
}
if (!inited) {
wantstart = true;
init();
return;
}
/* a no-op node just so we can disconnect all the sources simultaneously */
dst = ctx.createGain();
dst.connect(ctx.destination);
var ct = ctx.currentTime;
last = ct+.1; /* start immediately */
/* queue some buffers */
next();
next();
next();
}
function stop() {
try { dst.disconnect(); } catch(e) {}
}
function next() {
var ct = ctx.currentTime;
var q = ctx.createBufferSource();
q.buffer = bufs[seq[seqptr++]];
if (seqptr == seq.length) seqptr=0;
q.connect(dst);
q.onended = next;
q.start(last);
last += q.buffer.length/q.buffer.sampleRate;
}
return { init: init, start: start, stop: stop };
})(ctx);