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<!DOCTYPE HTML>
<html>
<head>
<title>Web Audio Spectrum Analyzer</title>
<script src="js/support/jquery-1.6.2.min.js"></script>
<script src="js/spectrum.js"></script>
<script src="js/remoteaudioplayer.js"></script>
<script src="js/recorder.js"></script>
<script src="js/brain-0.6.0.js"></script>
<script src="js/audioContext.js"></script>
<script src="js/pitchdetect.js"></script>
<link type="text/css" href="css/style.css" rel="Stylesheet" />
<link href='https://fonts.googleapis.com/css?family=Aldrich|Marvel'
rel='stylesheet' type='text/css'>
<script>
var context;
var frequencybox;
var wavebox;
var audio;
var mediaStreamSource;
var recorder;
var instances = new Array();
var net;
function initialize() {
context = new AudioContext();
// Setup frequency domain graph
frequencybox = new SpectrumBox(2048, 128, "fftbox", context);
frequencybox.setValidPoints(500);
frequencybox.getCanvasContext().fillStyle = "rgb(150, 150, 150)";
// Setup time domain graph
wavebox = new SpectrumBox(2048, 1000, "wavebox", context);
wavebox.setType(SpectrumBox.Types.TIME);
wavebox.getCanvasContext().fillStyle = "rgb(0, 0, 0)";
// Load MP3
audio = new RemoteAudioPlayer(context, "audio/track.mp3");
audio.load(function() {
//$('#play').text("Play");
//$('#play').click(play);
});
//create the NN
net = new brain.NeuralNetwork({
hiddenLayers: [4,4],
learningRate: 0.3
});
}
function play() {
if(mediaStreamSource){
// Enable graphs
wavebox.enable();
frequencybox.enable();
recorder.record();
$('#train').text("Stop");
$('#train').click(stop);
}
else{
alert("Please Connect the Microphone!");
}
}
function stop() {
// Disable graphs
wavebox.disable();
frequencybox.disable();
recorder.stop();
//audio.getSource().disconnect();
console.log(frequencybox.current);
createDownloadLink();
recorder.clear();
$('#train').text("Train");
$('#train').click(play);
}
var trained = false;
function test() {
//train the net before
if(!trained){
net = new brain.NeuralNetwork();
localStorage.setItem('instances', JSON.stringify(instances));
console.log(JSON.stringify((net.train(instances, {
errorThresh: 0.005, // error threshold to reach
iterations: 50, // maximum training iterations
log: true, // console.log() progress periodically
logPeriod: 10 // number of iterations between logging
}))));
trained=true;
}
if(mediaStreamSource){
// Enable graphs
wavebox.enable();
frequencybox.enable();
$('#test').text("Stop");
$('#test').click(stopTest);
}
else{
alert("Please Connect the Microphone!");
}
}
var th = 0.4;
function stopTest() {
// Disable graphs
wavebox.disable();
frequencybox.disable();
$('#test').text("Test");
$('#test').click(test);
var testInstance = new Object();
var out = document.getElementById('output');
out.innerHTML = "";
if(frequencybox.getSamples()){
var normalized_sample = normalize(frequencybox.getSamples(), getMax(frequencybox.getSamples()));
latestChar = undefined;
console.clear();
for(i=0; i<normalized_sample.length; i++){
res = net.run(normalized_sample[i]);
var tempmax = getJSONmax(res);
if(res[tempmax]>th && latestChar!=tempmax){
//print only vowels
if((tempmax == 'A')||(tempmax == 'E')||(tempmax == 'I')||(tempmax == 'O')||(tempmax == 'U')){
out.innerHTML= out.innerHTML + ' - '+tempmax;
latestChar = tempmax;
}
}
console.log(sortJSON(res, new Object()));
}
}
}
var source;
var wavenode;
var frequencynode;
function iCanHazUserMedia(stream) {
mediaStreamSource = context.createMediaStreamSource( stream );
source = mediaStreamSource || audio.getSource();
var filter = context.createBiquadFilter();
var lpfilter = context.createBiquadFilter();
wavenode = wavebox.getAudioNode();
frequencynode = frequencybox.getAudioNode();
// Route audio and graphs
source.connect(frequencynode);
frequencynode.connect(wavenode);
wavenode.connect(context.destination);
recorder = new Recorder(mediaStreamSource);
recorder && recorder.record();
// Play audio
if(mediaStreamSource==undefined){
audio.reload();
source.noteOn(0);
}
}
function useMicrophoneAsInput(){
try {
navigator.getUserMedia = ( navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
navigator.getUserMedia({audio:true},iCanHazUserMedia,// errorCallback
function(err) {
console.log("The following error occured: " + err);
});
} catch (e) {
alert('No web audio support in this browser');
console.log(e)
}
}
function acceptData(){
var str = prompt("Insert the related output");
var res = str.split(',');
if(frequencybox.getSamples()){
trained = false; // in order to allow further training, after a first test;
//normalize data
var normalized_sample = normalize(frequencybox.getSamples(), getMax(frequencybox.getSamples()));
if(res.length==3){
result = res[0];
start = parseInt(res[1]);
end = parseInt(res[2]);
}
else{
result = res[0];
start = 0;//Math.floor(normalized_sample.length*0.3);
end = normalized_sample.length;//Math.min(Math.floor(normalized_sample.length*0.3)+5,Math.floor(normalized_sample.length*0.8));
}
var temp_instances = new Array();
var j=0;
for(i=start; i<end; i++){
temp_instances[j++] = normalized_sample[i];
}
var inst_length = instances.length;
for(i=inst_length; i<inst_length+temp_instances.length-1; i++){
if(temp_instances[i-inst_length].length > 0){
instances[i] = new Object();
instances[i]['input'] = temp_instances[i-inst_length];
switch(result)
{
case 'A':
instances[i]['output'] = new Object();
instances[i]['output'][result]= 1;
break;
case 'E':
instances[i]['output']= {E : 1};
break;
case 'I':
instances[i]['output']= {I : 1};
break;
case 'O':
instances[i]['output']= {O : 1};
break;
case 'U':
instances[i]['output']= {U : 1};
break;
case 'N':
instances[i]['output']= {N : 1};
break;
default:
instances[i]['output'] = new Object();
instances[i]['output'][result] = 1;
}
}
}
//console.log(JSON.stringify(instances));
}
}
function normalize(matrix, max){
var normalized = new Array();
var noise = 0.3;
for(i=0; i<matrix.length; i++){
normalized[i] = new Array(matrix[i].length);
for(j=0; j<matrix[i].length; j++){
if(max!=0){
normalized[i][j] = Math.max(0,matrix[i][j]);
}
else normalized[i][j] = 0;
}
}
return normalized;
}
function getMax(matrix){
var max = matrix[0][0];
for(i=0; i<matrix.length; i++){
for(j=0; j<matrix[i].length; j++){
if(matrix[i][j]>max) max = matrix[i][j]
}
}
return max;
}
function getJSONmax(obj){
var max = Object.keys(obj)[0];
for (var key in obj) {
if(obj[max]< obj[key]) max = key;
}
return max;
}
function sortJSON(obj,max){
if(Object.keys(obj).length){
var key = getJSONmax(obj);
max[key] = obj[key];
delete obj[key];
sortJSON(obj,max);
}
return max;
}
function createDownloadLink() {
recorder && recorder.exportWAV(function(blob) {
var url = URL.createObjectURL(blob);
var li = document.createElement('li');
var au = document.createElement('audio');
var ahf = document.createElement('a');
var rhf = document.createElement('a');
au.controls = true;
au.src = url;
ahf.href = "#";
ahf.setAttribute("onclick","acceptData()");
ahf.innerHTML = " Accept ";
rhf.href = "#";
rhf.innerHTML = " Reject ";
li.appendChild(au);
li.appendChild(ahf);
li.appendChild(rhf);
document.getElementById('recordinglist').innerHTML = "";
document.getElementById('recordinglist').appendChild(li);
});
}
function loadFromLS(){
console.log("Successfully Loaded"+JSON.stringify(localStorage.getItem('instances')));
instances = eval(localStorage.getItem('instances'));
}
window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;
var fs = null;
function errorHandler(e) {
var msg = '';
switch (e.code) {
case FileError.QUOTA_EXCEEDED_ERR:
msg = 'QUOTA_EXCEEDED_ERR';
break;
case FileError.NOT_FOUND_ERR:
msg = 'NOT_FOUND_ERR';
break;
case FileError.SECURITY_ERR:
msg = 'SECURITY_ERR';
break;
case FileError.INVALID_MODIFICATION_ERR:
msg = 'INVALID_MODIFICATION_ERR';
break;
case FileError.INVALID_STATE_ERR:
msg = 'INVALID_STATE_ERR';
break;
default:
msg = 'Unknown Error';
break;
};
document.querySelector('#example-list-fs-ul').innerHTML = 'Error: ' + msg;
}
function initFS() {
window.requestFileSystem(window.TEMPORARY, 1024*1024, function(filesystem) {
fs = filesystem;
}, errorHandler);
}
function saveTS(){
fs.root.getFile('training2.json', {create: true}, function(fileEntry) {
// Create a FileWriter object for our FileEntry (log.txt).
fileEntry.createWriter(function(fileWriter) {
fileWriter.onwriteend = function(e) {
console.log('Write completed. '+e);
};
fileWriter.onerror = function(e) {
console.log('Write failed: ' + e.toString());
};
// Create a new Blob and write it to file
var blob = new Blob([JSON.stringify(instances)], {type: 'text/plain'});
fileWriter.write(blob);
}, errorHandler);
}, errorHandler);
}
function loadTS(){
fs.root.getFile('training2.json', {}, function(fileEntry) {
fileEntry.file(function(file) {
var reader = new FileReader();
reader.onloadend = function(e) {
console.log(this.result);
instances = eval(this.result);
};
reader.readAsText(file);
}, errorHandler);
}, errorHandler);
}
function loadRemoteTS(){
$.getJSON( "js/training.json", function( data ) {
instances = data;
});
}
$(function() { initialize(); initFS();});
</script>
</head>
<body>
<center>
<div id="wrapper">
<h1 style="margin: 2px" >Vowels Reconignizer</h1>
Credit: <a href="http://0xfe.blogspot.com">0xfe</a> -
Extends by: <a href="http://giacomolm.blogspot.com">@giacomolamo</a>
<p/>
<div class="boxes">
<div id="canvasbox">
<canvas id="fftbox" width=500 height=100></canvas>
<canvas id="wavebox" width=500 height=100></canvas>
</div>
</div>
<div class="pitch">Pitch <span id="pitch">--</span>Hz</div>
<p/>
<a href="#" id="play" onclick="useMicrophoneAsInput()">Microphone</a>
<a href="#" id="train" onmousedown="play()" onmouseup="stop()">Train</a>
<a href="#" id="test" onmousedown="test()" onmouseup="stopTest()">Test</a>
<div class="output">Output<span id="output">--</span></div>
<p/>
<p name="load"><a href="#load" onclick="saveTS()">Save</a> your TS on a local file, or <a href="#load" onclick="loadTS()">Load </a> your latest version<br>Or <a href="#load" onclick="loadRemoteTS()">Load </a> the italian one (1,7 MB)</p>
<div>
<ul id="recordinglist">
</ul>
</div>
<p/>
<b>Note</b>: This demo only works on new versions of Chrome and Safari.
<p/>
</div>
</body>
</html>