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test.html
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<!doctype html>
<html>
<head>
<title>mySynth</title>
<script>
const PATH = '/System/Library/Sounds/',
SOUNDS = ['Basso', 'Blow', 'Bottle', 'Frog', 'Funk', 'Glass', 'Hero',
'Morse', 'Ping', 'Pop', 'Purr', 'Sosumi', 'Submarine', 'Tink'];
var myAudioContext, myAudioAnalyser,
myBuffers = {}, mySource,
myNodes = {}, mySpectrum,
isPlaying = false;
function init() {
if('webkitAudioContext' in window) {
myAudioContext = new webkitAudioContext();
// an analyser is used for the spectrum
myAudioAnalyser = myAudioContext.createAnalyser();
myAudioAnalyser.smoothingTimeConstant = 0.85;
myAudioAnalyser.connect(myAudioContext.destination);
fetchSounds();
}
}
function fetchSounds() {
var request = new XMLHttpRequest();
for (var i = 0, len = SOUNDS.length; i < len; i++) {
request = new XMLHttpRequest();
// the underscore prefix is a common naming convention
// to remind us that the variable is developer-supplied
request._soundName = SOUNDS[i];
request.open('GET', PATH + request._soundName + '.aiff', true);
request.responseType = 'arraybuffer';
request.addEventListener('load', bufferSound, false);
request.send();
}
}
function bufferSound(event) {
var request = event.target;
var buffer = myAudioContext.createBuffer(request.response, false);
myBuffers[request._soundName] = buffer;
}
function selectRandomBuffer() {
var rand = Math.floor(Math.random() * SOUNDS.length);
var soundName = SOUNDS[rand];
return myBuffers[soundName];
}
function routeSound(source) {
myNodes.filter = myAudioContext.createBiquadFilter();
myNodes.panner = myAudioContext.createPanner();
myNodes.volume = myAudioContext.createGainNode();
// var compressor = myAudioContext.createDynamicsCompressor();
// set node values to current slider values
var highpass = document.querySelector('#highpass').value;
var panX = document.querySelector('#pan').value;
var volume = document.querySelector('#volume').value;
myNodes.filter.type = 1; // highpass
myNodes.filter.frequency.value = highpass;
myNodes.panner.setPosition(panX, 0, 0);
myNodes.volume.gain.value = volume;
// pass source through series of nodes
source.connect(myNodes.filter);
myNodes.filter.connect(myNodes.panner);
myNodes.panner.connect(myNodes.volume);
myNodes.volume.connect(myAudioAnalyser);
return source;
}
function playSound() {
// create a new AudioBufferSourceNode
var source = myAudioContext.createBufferSource();
source.buffer = selectRandomBuffer();
source.loop = true;
source = routeSound(source);
// play right now (0 seconds from now)
// can also pass myAudioContext.currentTime
source.noteOn(0);
mySpectrum = setInterval(drawSpectrum, 30);
mySource = source;
}
function pauseSound() {
var source = mySource;
source.noteOff(0);
clearInterval(mySpectrum);
}
function toggleSound(button) {
if(!isPlaying) {
playSound();
button.value = "Pause sound";
isPlaying = true;
}
else {
pauseSound();
button.value = "Play random sound";
isPlaying = false;
}
}
function drawSpectrum() {
var canvas = document.querySelector('canvas');
var ctx = canvas.getContext('2d');
var width = canvas.width;
var height = canvas.height;
var bar_width = 10;
ctx.clearRect(0, 0, width, height);
var freqByteData = new Uint8Array(myAudioAnalyser.frequencyBinCount);
myAudioAnalyser.getByteFrequencyData(freqByteData);
var barCount = Math.round(width / bar_width);
for (var i = 0; i < barCount; i++) {
var magnitude = freqByteData[i];
// some values need adjusting to fit on the canvas
ctx.fillRect(bar_width * i, height, bar_width - 2, -magnitude + 60);
}
}
function sliderChange(slider) {
if(myAudioContext.activeSourceCount > 0) {
if(slider.id == 'highpass') {
var highpass = slider.value;
myNodes.filter.frequency.value = highpass;
}
else if(slider.id == 'pan') {
var panX = slider.value;
myNodes.panner.setPosition(panX, 0, 0);
}
else if(slider.id == 'volume') {
var volume = slider.value;
myNodes.volume.gain.value = volume;
}
}
}
</script>
<style>
input { display: block; }
</style>
</head>
<body onload="init()">
<input id="play" onclick="toggleSound(this)" type="button" value="Play random sound" />
<span>Highpass:</span>
<input id="highpass" onchange="sliderChange(this)" type="range" min="0" max="1024" step="1" value="512" />
<span>Pan:</span>
<input id="pan" onchange="sliderChange(this)" type="range" min="-3" max="3" step="0.01" value="0" />
<span>Volume:</span>
<input id="volume" onchange="sliderChange(this)" type="range" min="0" max="1" step="0.01" value="1" />
<canvas width="300" height="200"></canvas>
</body>
</html>