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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Javascript Audio Processing
</title>
<script src="https://google-code-prettify.googlecode.com/svn/loader/run_prettify.js?autoload=true&skin=sunburst&lang=css" defer="defer"></script>
<!-- show all line numbers-->
<style type="text/css">.prettyprint ol.linenums > li { list-style-type: decimal }</style>
<script src="../maxiLib.js"></script>
<!-- <script src="../maxiLib_noWebAudio.js"></script> -->
<!-- <script src="../../src/js/maxi_webAudio.js"></script> -->
<!-- Our javascript code -->
<script type="text/javascript">
// An example of jsMaxim with manual implementation of webAudio
var context = new (window.AudioContext || window.webkitAudioContext)();
var source;
var jsProcessor = 0;
var analyser;
var output = 0;
var bufferLoader;
// function handling audio processing
// called byjsProcessor
function process(event) {
var numChannels = event.outputBuffer.numberOfChannels;
var outputLength = event.outputBuffer.getChannelData(0).length;
for (var i = 0; i < outputLength; ++i) {
play();
if(output instanceof Array){ // check if we're using arrays
for (var channel = 0; channel < numChannels; channel++) {
event.outputBuffer.getChannelData(channel)[i] = output[channel];
}
}
else
{
for (var channel = 0; channel < numChannels; channel++) {
event.outputBuffer.getChannelData(channel)[i] = output;
}
}
}
}
function initAudio(numChannels) {
source = context.createBufferSource();
jsProcessor = context.createScriptProcessor(4096, numChannels, numChannels);
jsProcessor.onaudioprocess = process;
analyser = context.createAnalyser();
analyser.fftSize = 2048;
// Connect the processing graph: source -> jsProcessor -> analyser -> destination
source.connect(jsProcessor);
jsProcessor.connect(analyser);
analyser.connect(context.destination);
}
function init() {
initAudio(2);
setup();
}
window.onload = init;
// ----------------------------------------------------------------------
// The code
var mySine = new maximJs.maxiOsc();
var mySamp = new maximJs.maxiSample();
function setup(){
// assign sample to mySamp using current context
maximJs.maxiTools.loadSample("audio/beat2.wav", mySamp, context);
// makes temporary AudioContext to assign file
// maximJs.maxiTools.loadSample("audio/beat2.wav", mySamp);
}
// called from process() function
function play(){
// output = mySine.sinewave(440);
if(mySamp.isReady()){
output = mySamp.play();
}
}
</script>
</head>
<body>
<h1> </h1>
<p id="funcs"></p>
<p>
</p>
<pre class="prettyprint lang-js linenums:true" id="quine" style="border:4px solid #88c" >
// An example of jsMaxim with manual implementation of webAudio
var context = new (window.AudioContext || window.webkitAudioContext)();
var source;
var jsProcessor = 0;
var analyser;
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var output = 0;
var bufferLoader;
// function handling audio processing
// called byjsProcessor
function process(event) {
var numChannels = event.outputBuffer.numberOfChannels;
var outputLength = event.outputBuffer.getChannelData(0).length;
for (var i = 0; i < outputLength; ++i) {
play();
if(output instanceof Array){ // check if we're using arrays
for (var channel = 0; channel < numChannels; channel++) {
event.outputBuffer.getChannelData(channel)[i] = output[channel];
}
}
else
{
for (var channel = 0; channel < numChannels; channel++) {
event.outputBuffer.getChannelData(channel)[i] = output;
}
}
}
}
function initAudio(numChannels) {
source = context.createBufferSource();
jsProcessor = context.createScriptProcessor(4096, numChannels, numChannels);
jsProcessor.onaudioprocess = process;
analyser = context.createAnalyser();
analyser.fftSize = 2048;
// Connect the processing graph: source -> jsProcessor -> analyser -> destination
source.connect(jsProcessor);
jsProcessor.connect(analyser);
analyser.connect(context.destination);
}
function init() {
initAudio(2);
setup();
}
window.onload = init;
// ----------------------------------------------------------------------
// The code
var mySine = new maximJs.maxiOsc();
var mySamp = new maximJs.maxiSample();
function setup(){
// assign sample to mySamp using current context
maximJs.maxiTools.loadSample("audio/beat2.wav", mySamp, context);
// makes temporary AudioContext to assign file
// maximJs.maxiTools.loadSample("audio/beat2.wav", mySamp);
}
// called from process() function
function play(){
// output = mySine.sinewave(440);
if(mySamp.isReady()){
output = mySamp.play();
}
}