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index.html
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<!doctype html>
<html>
<head>
<title>Beats Per Second Metronome</title>
<script>
const SOUNDURL = './Pop.mp3';
var myAudioContext,
myBuffer,
mySource,
myNodes = {},
myBps = 2,
isPlaying = false;
function init() {
if('webkitAudioContext' in window) {
myAudioContext = new webkitAudioContext();
} else {
myAudioContext = new AudioContext();
}
var request = new XMLHttpRequest();
request.open('GET', SOUNDURL, true);
request.responseType = 'arraybuffer';
request.addEventListener('load', bufferCallback, false);
request.send();
}
function bufferCallback(event) {
var request = event.target;
myAudioContext.decodeAudioData(request.response,
function(buffer) { myBuffer = buffer; }
);
}
function routeSound(source) {
myNodes.panner = myAudioContext.createPanner();
myNodes.volume = myAudioContext.createGain();
// set node values to current slider values
var panX = document.querySelector('#pan').value;
var volume = document.querySelector('#volume').value;
myNodes.panner.setPosition(panX, 0, 0);
myNodes.volume.gain.value = volume;
// pass source through series of nodes
source.connect(myNodes.panner);
myNodes.panner.connect(myNodes.volume);
myNodes.volume.connect(myAudioContext.destination);
return source;
}
function playSound() {
// create a new AudioBufferSourceNode
var source = myAudioContext.createBufferSource();
source.buffer = myBuffer;
source.loop = true;
source.loopStart = 0;
source.loopEnd = 1.0 / myBps;
source = routeSound(source);
source.start(0);
mySource = source;
}
function pauseSound() {
mySource.stop(0);
}
function toggleSound(button) {
if (isPlaying) {
pauseSound();
button.value = "Start";
isPlaying = false;
} else {
playSound();
button.value = "Stop";
isPlaying = true;
}
}
function volumeChange(slider) {
if (myNodes.volume) {
var volume = slider.value;
myNodes.volume.gain.value = volume;
}
}
function panChange(slider) {
if (myNodes.panner) {
var panX = slider.value;
myNodes.panner.setPosition(panX, 0, 0);
}
}
function bpsChange(radio) {
myBps = radio.value;
if (isPlaying) {
mySource.loopEnd = 1.0 / myBps;
}
}
</script>
<style>
body {
color: white;
background-color:#704;
text-align:center;
}
</style>
</head>
<body onload="init()">
<h1>Beats Per Second Metronome</h1>
<h4 style="text-align:right">by b0b</h4>
<div style="float:left; width:33%;">Volume:<br />
<input id="volume" onchange="volumeChange(this)" type="range" min="0" max="1" step="0.1" value="1" />
</div>
<div style="float:right; width:33%;">Pan:<br />
<input id="pan" onchange="panChange(this)" type="range" min="-1.0" max="1.0" step="0.5" value="0" />
</div>
<div><input id="play" onclick="toggleSound(this)" type="button" value="Start" />
</div>
<br />
<div>Beats Per Second<br />
1 <input name="bps" type="radio" onchange="bpsChange(this)" value="1" /><br />
2 <input name="bps" type="radio" onchange="bpsChange(this)" value="2" checked /><br />
3 <input name="bps" type="radio" onchange="bpsChange(this)" value="3" /><br />
4 <input name="bps" type="radio" onchange="bpsChange(this)" value="4" /><br />
5 <input name="bps" type="radio" onchange="bpsChange(this)" value="5" /><br />
6 <input name="bps" type="radio" onchange="bpsChange(this)" value="6" /><br />
7 <input name="bps" type="radio" onchange="bpsChange(this)" value="7" /><br />
8 <input name="bps" type="radio" onchange="bpsChange(this)" value="8" /><br />
9 <input name="bps" type="radio" onchange="bpsChange(this)" value="9" /><br />
10 <input name="bps" type="radio" onchange="bpsChange(this)" value="10" /><br />
11 <input name="bps" type="radio" onchange="bpsChange(this)" value="11" /><br />
12 <input name="bps" type="radio" onchange="bpsChange(this)" value="12" /><br />
13 <input name="bps" type="radio" onchange="bpsChange(this)" value="13" /><br />
14 <input name="bps" type="radio" onchange="bpsChange(this)" value="14" /><br />
15 <input name="bps" type="radio" onchange="bpsChange(this)" value="15" /><br />
16 <input name="bps" type="radio" onchange="bpsChange(this)" value="16" /><br />
17 <input name="bps" type="radio" onchange="bpsChange(this)" value="17" /><br />
18 <input name="bps" type="radio" onchange="bpsChange(this)" value="18" /><br />
19 <input name="bps" type="radio" onchange="bpsChange(this)" value="19" /><br />
20 <input name="bps" type="radio" onchange="bpsChange(this)" value="20" /><br />
21 <input name="bps" type="radio" onchange="bpsChange(this)" value="21" /><br />
22 <input name="bps" type="radio" onchange="bpsChange(this)" value="22" /><br />
23 <input name="bps" type="radio" onchange="bpsChange(this)" value="23" /><br />
24 <input name="bps" type="radio" onchange="bpsChange(this)" value="24" /><br />
</div>
<br />
</body>
</html>