BrechtDeMan@938: /**
BrechtDeMan@938:  * core.js
BrechtDeMan@938:  * 
BrechtDeMan@938:  * Main script to run, calls all other core functions and manages loading/store to backend.
BrechtDeMan@938:  * Also contains all global variables.
BrechtDeMan@938:  */
BrechtDeMan@938: 
BrechtDeMan@938: /* create the web audio API context and store in audioContext*/
BrechtDeMan@938: var audioContext; // Hold the browser web audio API
BrechtDeMan@938: var projectXML; // Hold the parsed setup XML
nicholas@952: var popup; // Hold the interfacePopup object
nicholas@952: var currentState; // Keep track of the current state (pre/post test, which test, final test? first test?)
BrechtDeMan@938: var testXMLSetups = []; // Hold the parsed test instances
BrechtDeMan@938: var testResultsHolders =[]; // Hold the results from each test for publishing to XML
BrechtDeMan@938: var currentTrackOrder = []; // Hold the current XML tracks in their (randomised) order
BrechtDeMan@938: var currentTestHolder; // Hold any intermediate results during test - metrics
BrechtDeMan@938: var audioEngineContext; // The custome AudioEngine object
BrechtDeMan@938: var projectReturn; // Hold the URL for the return
BrechtDeMan@938: var preTestQuestions = document.createElement('PreTest'); // Store any pre-test question response
BrechtDeMan@938: var postTestQuestions = document.createElement('PostTest'); // Store any post-test question response
BrechtDeMan@938: 
BrechtDeMan@938: // Add a prototype to the bufferSourceNode to reference to the audioObject holding it
BrechtDeMan@938: AudioBufferSourceNode.prototype.owner = undefined;
BrechtDeMan@938: 
BrechtDeMan@938: window.onload = function() {
BrechtDeMan@938: 	// Function called once the browser has loaded all files.
BrechtDeMan@938: 	// This should perform any initial commands such as structure / loading documents
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Create a web audio API context
BrechtDeMan@938: 	// Fixed for cross-browser support
BrechtDeMan@938: 	var AudioContext = window.AudioContext || window.webkitAudioContext;
BrechtDeMan@938: 	audioContext = new AudioContext;
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Create the audio engine object
BrechtDeMan@938: 	audioEngineContext = new AudioEngine();
nicholas@952: 	
nicholas@952: 	// Create the popup interface object
nicholas@952: 	popup = new interfacePopup();
BrechtDeMan@938: };
BrechtDeMan@938: 
nicholas@952: function interfacePopup() {
nicholas@952: 	// Creates an object to manage the popup
nicholas@952: 	this.popup = null;
nicholas@952: 	this.popupContent = null;
nicholas@952: 	this.popupButton = null;
nicholas@952: 	this.popupOptions = null;
nicholas@952: 	this.currentIndex = null;
nicholas@952: 	this.responses = null;
nicholas@952: 	this.createPopup = function(){
nicholas@952: 		// Create popup window interface
nicholas@952: 		var insertPoint = document.getElementById("topLevelBody");
nicholas@952: 		var blank = document.createElement('div');
nicholas@952: 		blank.className = 'testHalt';
nicholas@952: 		
nicholas@952: 		this.popup = document.createElement('div');
nicholas@952: 		this.popup.id = 'popupHolder';
nicholas@952: 		this.popup.className = 'popupHolder';
nicholas@952: 		this.popup.style.position = 'absolute';
nicholas@952: 		this.popup.style.left = (window.innerWidth/2)-250 + 'px';
nicholas@952: 		this.popup.style.top = (window.innerHeight/2)-125 + 'px';
nicholas@952: 		
nicholas@952: 		this.popupContent = document.createElement('div');
nicholas@952: 		this.popupContent.id = 'popupContent';
nicholas@952: 		this.popupContent.style.marginTop = '25px';
nicholas@952: 		this.popupContent.align = 'center';
nicholas@952: 		this.popup.appendChild(this.popupContent);
nicholas@952: 		
nicholas@952: 		this.popupButton = document.createElement('button');
nicholas@952: 		this.popupButton.className = 'popupButton';
nicholas@952: 		this.popupButton.innerHTML = 'Next';
nicholas@952: 		this.popupButton.onclick = function(){popup.buttonClicked();};
nicholas@952: 		insertPoint.appendChild(this.popup);
nicholas@952: 		insertPoint.appendChild(blank);
nicholas@952: 	};
nicholas@951: 	
nicholas@952: 	this.showPopup = function(){
nicholas@952: 		if (this.popup == null || this.popup == undefined) {
nicholas@952: 			this.createPopup();
nicholas@952: 		}
nicholas@952: 		this.popup.style.zIndex = 3;
nicholas@952: 		this.popup.style.visibility = 'visible';
nicholas@952: 		var blank = document.getElementsByClassName('testHalt')[0];
nicholas@952: 		blank.style.zIndex = 2;
nicholas@952: 		blank.style.visibility = 'visible';
nicholas@952: 	};
nicholas@952: 	
nicholas@952: 	this.hidePopup = function(){
nicholas@952: 		this.popup.style.zIndex = -1;
nicholas@952: 		this.popup.style.visibility = 'hidden';
nicholas@952: 		var blank = document.getElementsByClassName('testHalt')[0];
nicholas@952: 		blank.style.zIndex = -2;
nicholas@952: 		blank.style.visibility = 'hidden';
nicholas@952: 	};
nicholas@952: 	
nicholas@952: 	this.postNode = function() {
nicholas@952: 		// This will take the node from the popupOptions and display it
nicholas@952: 		var node = this.popupOptions[this.currentIndex];
nicholas@952: 		this.popupContent.innerHTML = null;
nicholas@952: 		if (node.nodeName == 'statement') {
nicholas@952: 			var span = document.createElement('span');
nicholas@952: 			span.textContent = node.textContent;
nicholas@952: 			this.popupContent.appendChild(span);
nicholas@952: 		} else if (node.nodeName == 'question') {
nicholas@952: 			var span = document.createElement('span');
nicholas@952: 			span.textContent = node.textContent;
nicholas@952: 			var textArea = document.createElement('textarea');
nicholas@952: 			var br = document.createElement('br');
nicholas@952: 			this.popupContent.appendChild(span);
nicholas@952: 			this.popupContent.appendChild(br);
nicholas@952: 			this.popupContent.appendChild(textArea);
nicholas@952: 		}
nicholas@952: 		this.popupContent.appendChild(this.popupButton);
nicholas@952: 	}
nicholas@952: 	
nicholas@952: 	this.initState = function(node) {
nicholas@952: 		//Call this with your preTest and postTest nodes when needed to
nicholas@952: 		// initialise the popup procedure.
nicholas@952: 		this.popupOptions = $(node).children();
nicholas@952: 		if (this.popupOptions.length > 0) {
nicholas@952: 			if (node.nodeName == 'preTest' || node.nodeName == 'PreTest') {
nicholas@952: 				this.responses = document.createElement('PreTest');
nicholas@952: 			} else if (node.nodeName == 'postTest' || node.nodeName == 'PostTest') {
nicholas@952: 				this.responses = document.createElement('PostTest');
nicholas@952: 			} else {
nicholas@952: 				console.log ('WARNING - popup node neither pre or post!');
nicholas@952: 				this.responses = document.createElement('responses');
nicholas@952: 			}
nicholas@952: 			this.currentIndex = 0;
nicholas@952: 			this.showPopup();
nicholas@952: 			this.postNode();
nicholas@952: 		}
nicholas@952: 	}
nicholas@952: 	
nicholas@952: 	this.buttonClicked = function() {
nicholas@952: 		// Each time the popup button is clicked!
nicholas@952: 		var node = this.popupOptions[this.currentIndex];
nicholas@952: 		if (node.nodeName == 'question') {
nicholas@952: 			// Must extract the question data
nicholas@952: 			var mandatory = node.attributes['mandatory'];
nicholas@952: 			if (mandatory == undefined) {
nicholas@952: 				mandatory = false;
nicholas@952: 			} else {
nicholas@952: 				if (mandatory.value == 'true'){mandatory = true;}
nicholas@952: 				else {mandatory = false;}
nicholas@952: 			}
nicholas@952: 			var textArea = $(popup.popupContent).find('textarea')[0];
nicholas@952: 			if (mandatory == true && textArea.value.length == 0) {
nicholas@952: 				alert('This question is mandatory');
nicholas@952: 				return;
nicholas@952: 			} else {
nicholas@952: 				// Save the text content
nicholas@952: 				var hold = document.createElement('comment');
nicholas@952: 				hold.id = node.attributes['id'].value;
nicholas@952: 				hold.innerHTML = textArea.value;
nicholas@953: 				console.log("Question: "+ node.textContent);
nicholas@953: 				console.log("Question Response: "+ textArea.value);
nicholas@952: 				this.responses.appendChild(hold);
nicholas@952: 			}
nicholas@952: 		}
nicholas@952: 		this.currentIndex++;
nicholas@952: 		if (this.currentIndex < this.popupOptions.length) {
nicholas@952: 			this.postNode();
nicholas@952: 		} else {
nicholas@952: 			// Reached the end of the popupOptions
nicholas@952: 			this.hidePopup();
nicholas@952: 			advanceState();
nicholas@952: 		}
nicholas@952: 	}
nicholas@951: }
nicholas@951: 
nicholas@952: function advanceState()
nicholas@951: {
nicholas@952: 	console.log(currentState);
nicholas@952: 	if (currentState == 'preTest')
nicholas@952: 	{
nicholas@952: 		// End of pre-test, begin the test
nicholas@952: 		preTestQuestions = popup.responses;
nicholas@952: 		loadTest(0);
nicholas@952: 	} else if (currentState == 'postTest') {
nicholas@952: 		postTestQuestions = popup.responses;
nicholas@952: 		console.log('ALL COLLECTED!'); 
nicholas@952: 	}else if (currentState.substr(0,10) == 'testRunPre')
nicholas@952: 	{
nicholas@952: 		// Start the test
nicholas@952: 		var testId = currentState.substr(11,currentState.length-10);
nicholas@952: 		currentState = 'testRun-'+testId;
nicholas@952: 		currentTestHolder.appendChild(popup.responses);
nicholas@952: 		//audioEngineContext.timer.startTest();
nicholas@952: 		//audioEngineContext.play();
nicholas@952: 	} else if (currentState.substr(0,11) == 'testRunPost')
nicholas@952: 	{
nicholas@952: 		var testId = currentState.substr(12,currentState.length-11);
nicholas@952: 		currentTestHolder.appendChild(popup.responses);
nicholas@952: 		testEnded(testId);
nicholas@952: 	} else if (currentState.substr(0,7) == 'testRun')
nicholas@952: 	{
nicholas@952: 		var testId = currentState.substr(8,currentState.length-7);
nicholas@952: 		// Check if we have any post tests to perform
nicholas@952: 		var postXML = $(testXMLSetups[testId]).find('PostTest')[0];
nicholas@952: 		if (postXML == undefined || postXML.childElementCount == 0) {
nicholas@952: 			testEnded(testId);
nicholas@952: 		}
nicholas@952: 		else if (postXML.childElementCount > 0)
nicholas@952: 		{
nicholas@952: 			currentState = 'testRunPost-'+testId; 
nicholas@952: 			popup.initState(postXML);
nicholas@952: 		}
nicholas@952: 		else {
nicholas@952: 		
nicholas@952: 		
nicholas@952: 			// No post tests, check if we have another test to perform instead
nicholas@952: 			
nicholas@952: 		}
nicholas@951: 	}
nicholas@952: 	console.log(currentState);
nicholas@951: }
nicholas@951: 
nicholas@952: function testEnded(testId)
nicholas@951: {
nicholas@952: 	pageXMLSave(testId);
nicholas@952: 	if (testXMLSetups.length-1 > testId)
nicholas@952: 	{
nicholas@952: 		// Yes we have another test to perform
nicholas@952: 		testId = (Number(testId)+1);
nicholas@952: 		currentState = 'testRun-'+testId;
nicholas@952: 		loadTest(testId);
nicholas@952: 	} else {
nicholas@952: 		console.log('Testing Completed!');
nicholas@952: 		currentState = 'postTest';
nicholas@952: 		// Check for any post tests
nicholas@952: 		var xmlSetup = projectXML.find('setup');
nicholas@952: 		var postTest = xmlSetup.find('PostTest')[0];
nicholas@952: 		popup.initState(postTest);
nicholas@952: 	}
nicholas@951: }
nicholas@951: 
BrechtDeMan@938: function loadProjectSpec(url) {
BrechtDeMan@938: 	// Load the project document from the given URL, decode the XML and instruct audioEngine to get audio data
BrechtDeMan@938: 	// If url is null, request client to upload project XML document
BrechtDeMan@938: 	var r = new XMLHttpRequest();
BrechtDeMan@938: 	r.open('GET',url,true);
BrechtDeMan@938: 	r.onload = function() {
BrechtDeMan@938: 		loadProjectSpecCallback(r.response);
BrechtDeMan@938: 	};
BrechtDeMan@938: 	r.send();
BrechtDeMan@938: };
BrechtDeMan@938: 
BrechtDeMan@938: function loadProjectSpecCallback(response) {
BrechtDeMan@938: 	// Function called after asynchronous download of XML project specification
BrechtDeMan@938: 	var decode = $.parseXML(response);
BrechtDeMan@938: 	projectXML = $(decode);
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Now extract the setup tag
BrechtDeMan@938: 	var xmlSetup = projectXML.find('setup');
BrechtDeMan@938: 	// Detect the interface to use and load the relevant javascripts.
BrechtDeMan@938: 	var interfaceType = xmlSetup[0].attributes['interface'];
BrechtDeMan@938: 	var interfaceJS = document.createElement('script');
BrechtDeMan@938: 	interfaceJS.setAttribute("type","text/javascript");
BrechtDeMan@938: 	if (interfaceType.value == 'APE') {
BrechtDeMan@938: 		interfaceJS.setAttribute("src","ape.js");
BrechtDeMan@938: 		
BrechtDeMan@938: 		// APE comes with a css file
BrechtDeMan@938: 		var css = document.createElement('link');
BrechtDeMan@938: 		css.rel = 'stylesheet';
BrechtDeMan@938: 		css.type = 'text/css';
BrechtDeMan@938: 		css.href = 'ape.css';
BrechtDeMan@938: 		
BrechtDeMan@938: 		document.getElementsByTagName("head")[0].appendChild(css);
BrechtDeMan@938: 	}
BrechtDeMan@938: 	document.getElementsByTagName("head")[0].appendChild(interfaceJS);
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function createProjectSave(destURL) {
BrechtDeMan@938: 	// Save the data from interface into XML and send to destURL
BrechtDeMan@938: 	// If destURL is null then download XML in client
BrechtDeMan@938: 	// Now time to render file locally
BrechtDeMan@938: 	var xmlDoc = interfaceXMLSave();
BrechtDeMan@938: 	if (destURL == "null" || destURL == undefined) {
BrechtDeMan@938: 		var parent = document.createElement("div");
BrechtDeMan@938: 		parent.appendChild(xmlDoc);
BrechtDeMan@938: 		var file = [parent.innerHTML];
BrechtDeMan@938: 		var bb = new Blob(file,{type : 'application/xml'});
BrechtDeMan@938: 		var dnlk = window.URL.createObjectURL(bb);
BrechtDeMan@938: 		var a = document.createElement("a");
BrechtDeMan@938: 		a.hidden = '';
BrechtDeMan@938: 		a.href = dnlk;
BrechtDeMan@938: 		a.download = "save.xml";
BrechtDeMan@938: 		a.textContent = "Save File";
BrechtDeMan@938: 		
BrechtDeMan@938: 		var submitDiv = document.getElementById('download-point');
BrechtDeMan@938: 		submitDiv.appendChild(a);
BrechtDeMan@938: 	}
BrechtDeMan@938: 	return submitDiv;
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function AudioEngine() {
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Create two output paths, the main outputGain and fooGain.
BrechtDeMan@938: 	// Output gain is default to 1 and any items for playback route here
BrechtDeMan@938: 	// Foo gain is used for analysis to ensure paths get processed, but are not heard
BrechtDeMan@938: 	// because web audio will optimise and any route which does not go to the destination gets ignored.
BrechtDeMan@938: 	this.outputGain = audioContext.createGain();
BrechtDeMan@938: 	this.fooGain = audioContext.createGain();
BrechtDeMan@938: 	this.fooGain.gain = 0;
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Use this to detect playback state: 0 - stopped, 1 - playing
BrechtDeMan@938: 	this.status = 0;
n@950: 	this.audioObjectsReady = false;
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Connect both gains to output
BrechtDeMan@938: 	this.outputGain.connect(audioContext.destination);
BrechtDeMan@938: 	this.fooGain.connect(audioContext.destination);
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Create the timer Object
BrechtDeMan@938: 	this.timer = new timer();
BrechtDeMan@938: 	// Create session metrics
BrechtDeMan@938: 	this.metric = new sessionMetrics(this);
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.loopPlayback = false;
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Create store for new audioObjects
BrechtDeMan@938: 	this.audioObjects = [];
BrechtDeMan@938: 	
n@950: 	this.play = function() {
n@950: 		// Start the timer and set the audioEngine state to playing (1)
n@950: 		if (this.status == 0) {
n@950: 			// Check if all audioObjects are ready
n@950: 			if (this.audioObjectsReady == false) {
n@950: 				this.audioObjectsReady = this.checkAllReady();
n@950: 			}
n@950: 			if (this.audioObjectsReady == true) {
n@950: 				this.timer.startTest();
n@950: 				this.status = 1;
n@950: 			}
n@950: 		}
n@950: 	};
BrechtDeMan@938: 	
n@950: 	this.stop = function() {
n@950: 		// Send stop and reset command to all playback buffers and set audioEngine state to stopped (1)
n@950: 		if (this.status == 1) {
n@950: 			for (var i=0; i<this.audioObjects.length; i++)
n@950: 			{
n@950: 				this.audioObjects[i].stop();
n@950: 			}
n@950: 			this.status = 0;
n@950: 		}
n@950: 	};
BrechtDeMan@938: 	
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.newTrack = function(url) {
BrechtDeMan@938: 		// Pull data from given URL into new audio buffer
BrechtDeMan@938: 		// URLs must either be from the same source OR be setup to 'Access-Control-Allow-Origin'
BrechtDeMan@938: 		
BrechtDeMan@938: 		// Create the audioObject with ID of the new track length;
BrechtDeMan@938: 		audioObjectId = this.audioObjects.length;
BrechtDeMan@938: 		this.audioObjects[audioObjectId] = new audioObject(audioObjectId);
BrechtDeMan@938: 
BrechtDeMan@938: 		// AudioObject will get track itself.
BrechtDeMan@938: 		this.audioObjects[audioObjectId].constructTrack(url);
BrechtDeMan@938: 	};
BrechtDeMan@938: 	
n@950: 	this.newTestPage = function() {
n@950: 		this.state = 0;
n@950: 		this.audioObjectsReady = false;
n@950: 		this.metric.reset();
n@950: 		this.audioObjects = [];
n@950: 	};
n@950: 	
nicholas@944: 	this.checkAllPlayed = function() {
nicholas@944: 		arr = [];
nicholas@944: 		for (var id=0; id<this.audioObjects.length; id++) {
nicholas@944: 			if (this.audioObjects[id].played == false) {
nicholas@944: 				arr.push(this.audioObjects[id].id);
nicholas@944: 			}
nicholas@944: 		}
nicholas@944: 		return arr;
nicholas@944: 	};
nicholas@944: 	
n@950: 	this.checkAllReady = function() {
n@950: 		var ready = true;
n@950: 		for (var i=0; i<this.audioObjects.length; i++) {
n@950: 			if (this.audioObjects[i].state == 0) {
n@950: 				// Track not ready
n@950: 				console.log('WAIT -- audioObject '+i+' not ready yet!');
n@950: 				ready = false;
n@950: 			};
n@950: 		}
n@950: 		return ready;
n@950: 	};
n@950: 	
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function audioObject(id) {
BrechtDeMan@938: 	// The main buffer object with common control nodes to the AudioEngine
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.id = id;
BrechtDeMan@938: 	this.state = 0; // 0 - no data, 1 - ready
BrechtDeMan@938: 	this.url = null; // Hold the URL given for the output back to the results.
BrechtDeMan@938: 	this.metric = new metricTracker();
BrechtDeMan@938: 	
nicholas@944: 	this.played = false;
nicholas@944: 	
BrechtDeMan@938: 	// Create a buffer and external gain control to allow internal patching of effects and volume leveling.
BrechtDeMan@938: 	this.bufferNode = undefined;
BrechtDeMan@938: 	this.outputGain = audioContext.createGain();
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Default output gain to be zero
BrechtDeMan@938: 	this.outputGain.gain.value = 0.0;
BrechtDeMan@938: 	
BrechtDeMan@938: 	// Connect buffer to the audio graph
BrechtDeMan@938: 	this.outputGain.connect(audioEngineContext.outputGain);
BrechtDeMan@938: 	
BrechtDeMan@938: 	// the audiobuffer is not designed for multi-start playback
BrechtDeMan@938: 	// When stopeed, the buffer node is deleted and recreated with the stored buffer.
BrechtDeMan@938: 	this.buffer;
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.play = function(startTime) {
BrechtDeMan@938: 		this.bufferNode = audioContext.createBufferSource();
nicholas@947: 		this.bufferNode.owner = this;
BrechtDeMan@938: 		this.bufferNode.connect(this.outputGain);
BrechtDeMan@938: 		this.bufferNode.buffer = this.buffer;
BrechtDeMan@938: 		this.bufferNode.loop = audioEngineContext.loopPlayback;
nicholas@947: 		if (this.bufferNode.loop == false) {
nicholas@947: 			this.bufferNode.onended = function() {
nicholas@947: 				this.owner.metric.listening(audioEngineContext.timer.getTestTime());
n@950: 			};
nicholas@947: 		}
nicholas@947: 		this.metric.listening(audioEngineContext.timer.getTestTime());
BrechtDeMan@938: 		this.bufferNode.start(startTime);
nicholas@944: 		this.played = true;
BrechtDeMan@938: 	};
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.stop = function() {
BrechtDeMan@937: 		if (this.bufferNode != undefined)
BrechtDeMan@937: 		{
BrechtDeMan@937: 			this.bufferNode.stop(0);
BrechtDeMan@937: 			this.bufferNode = undefined;
nicholas@947: 			this.metric.listening(audioEngineContext.timer.getTestTime());
BrechtDeMan@937: 		}
BrechtDeMan@938: 	};
BrechtDeMan@938: 
BrechtDeMan@938: 	this.constructTrack = function(url) {
BrechtDeMan@938: 		var request = new XMLHttpRequest();
BrechtDeMan@938: 		this.url = url;
BrechtDeMan@938: 		request.open('GET',url,true);
BrechtDeMan@938: 		request.responseType = 'arraybuffer';
BrechtDeMan@938: 		
BrechtDeMan@938: 		var audioObj = this;
BrechtDeMan@938: 		
BrechtDeMan@938: 		// Create callback to decode the data asynchronously
BrechtDeMan@938: 		request.onloadend = function() {
BrechtDeMan@938: 			audioContext.decodeAudioData(request.response, function(decodedData) {
BrechtDeMan@938: 				audioObj.buffer = decodedData;
BrechtDeMan@938: 				audioObj.state = 1;
BrechtDeMan@938: 			}, function(){
BrechtDeMan@938: 				// Should only be called if there was an error, but sometimes gets called continuously
BrechtDeMan@938: 				// Check here if the error is genuine
BrechtDeMan@938: 				if (audioObj.state == 0 || audioObj.buffer == undefined) {
BrechtDeMan@938: 					// Genuine error
BrechtDeMan@938: 					console.log('FATAL - Error loading buffer on '+audioObj.id);
BrechtDeMan@938: 				}
BrechtDeMan@938: 			});
BrechtDeMan@938: 		};
BrechtDeMan@938: 		request.send();
BrechtDeMan@938: 	};
BrechtDeMan@938: 	
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function timer()
BrechtDeMan@938: {
BrechtDeMan@938: 	/* Timer object used in audioEngine to keep track of session timings
BrechtDeMan@938: 	 * Uses the timer of the web audio API, so sample resolution
BrechtDeMan@938: 	 */
BrechtDeMan@938: 	this.testStarted = false;
BrechtDeMan@938: 	this.testStartTime = 0;
BrechtDeMan@938: 	this.testDuration = 0;
BrechtDeMan@938: 	this.minimumTestTime = 0; // No minimum test time
BrechtDeMan@938: 	this.startTest = function()
BrechtDeMan@938: 	{
BrechtDeMan@938: 		if (this.testStarted == false)
BrechtDeMan@938: 		{
BrechtDeMan@938: 			this.testStartTime = audioContext.currentTime;
BrechtDeMan@938: 			this.testStarted = true;
BrechtDeMan@938: 			this.updateTestTime();
BrechtDeMan@938: 			audioEngineContext.metric.initialiseTest();
BrechtDeMan@938: 		}
BrechtDeMan@938: 	};
BrechtDeMan@938: 	this.stopTest = function()
BrechtDeMan@938: 	{
BrechtDeMan@938: 		if (this.testStarted)
BrechtDeMan@938: 		{
BrechtDeMan@938: 			this.testDuration = this.getTestTime();
BrechtDeMan@938: 			this.testStarted = false;
BrechtDeMan@938: 		} else {
BrechtDeMan@938: 			console.log('ERR: Test tried to end before beginning');
BrechtDeMan@938: 		}
BrechtDeMan@938: 	};
BrechtDeMan@938: 	this.updateTestTime = function()
BrechtDeMan@938: 	{
BrechtDeMan@938: 		if (this.testStarted)
BrechtDeMan@938: 		{
BrechtDeMan@938: 			this.testDuration = audioContext.currentTime - this.testStartTime;
BrechtDeMan@938: 		}
BrechtDeMan@938: 	};
BrechtDeMan@938: 	this.getTestTime = function()
BrechtDeMan@938: 	{
BrechtDeMan@938: 		this.updateTestTime();
BrechtDeMan@938: 		return this.testDuration;
BrechtDeMan@938: 	};
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function sessionMetrics(engine)
BrechtDeMan@938: {
BrechtDeMan@938: 	/* Used by audioEngine to link to audioObjects to minimise the timer call timers;
BrechtDeMan@938: 	 */
BrechtDeMan@938: 	this.engine = engine;
BrechtDeMan@938: 	this.lastClicked = -1;
BrechtDeMan@938: 	this.data = -1;
n@950: 	this.reset = function() {
n@950: 		this.lastClicked = -1;
n@950: 		this.data = -1;
n@950: 	};
BrechtDeMan@938: 	this.initialiseTest = function(){};
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function metricTracker()
BrechtDeMan@938: {
BrechtDeMan@938: 	/* Custom object to track and collect metric data
BrechtDeMan@938: 	 * Used only inside the audioObjects object.
BrechtDeMan@938: 	 */
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.listenedTimer = 0;
BrechtDeMan@938: 	this.listenStart = 0;
nicholas@947: 	this.listenHold = false;
BrechtDeMan@938: 	this.initialPosition = -1;
BrechtDeMan@938: 	this.movementTracker = [];
BrechtDeMan@938: 	this.wasListenedTo = false;
BrechtDeMan@938: 	this.wasMoved = false;
BrechtDeMan@938: 	this.hasComments = false;
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.initialised = function(position)
BrechtDeMan@938: 	{
BrechtDeMan@938: 		if (this.initialPosition == -1) {
BrechtDeMan@938: 			this.initialPosition = position;
BrechtDeMan@938: 		}
BrechtDeMan@938: 	};
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.moved = function(time,position)
BrechtDeMan@938: 	{
BrechtDeMan@938: 		this.wasMoved = true;
BrechtDeMan@938: 		this.movementTracker[this.movementTracker.length] = [time, position];
BrechtDeMan@938: 	};
BrechtDeMan@938: 	
BrechtDeMan@938: 	this.listening = function(time)
BrechtDeMan@938: 	{
nicholas@947: 		if (this.listenHold == false)
BrechtDeMan@938: 		{
BrechtDeMan@938: 			this.wasListenedTo = true;
BrechtDeMan@938: 			this.listenStart = time;
nicholas@947: 			this.listenHold = true;
BrechtDeMan@938: 		} else {
BrechtDeMan@938: 			this.listenedTimer += (time - this.listenStart);
BrechtDeMan@938: 			this.listenStart = 0;
nicholas@947: 			this.listenHold = false;
BrechtDeMan@938: 		}
BrechtDeMan@938: 	};
BrechtDeMan@938: }
BrechtDeMan@938: 
BrechtDeMan@938: function randomiseOrder(input)
BrechtDeMan@938: {
BrechtDeMan@938: 	// This takes an array of information and randomises the order
BrechtDeMan@938: 	var N = input.length;
BrechtDeMan@938: 	var K = N;
BrechtDeMan@938: 	var holdArr = [];
BrechtDeMan@938: 	for (var n=0; n<N; n++)
BrechtDeMan@938: 	{
BrechtDeMan@938: 		// First pick a random number
BrechtDeMan@938: 		var r = Math.random();
BrechtDeMan@938: 		// Multiply and floor by the number of elements left
BrechtDeMan@938: 		r = Math.floor(r*input.length);
BrechtDeMan@938: 		// Pick out that element and delete from the array
BrechtDeMan@938: 		holdArr.push(input.splice(r,1)[0]);
BrechtDeMan@938: 	}
BrechtDeMan@938: 	return holdArr;
BrechtDeMan@938: }