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Sample Ter (Click) #1

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Sample Ter (Click) #1

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Binary file added 60_Clicks_L.wav
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Binary file added 60_Clicks_R.wav
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51 changes: 48 additions & 3 deletions app.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,12 @@ window.AudioContext = window.AudioContext || window.webkitAudioContext;
var audioContext = new AudioContext();

var sampleBis = document.querySelector('#sampleBis');
var sampleTer = document.querySelector('#sampleTer');

var sampleTerUrl = './60_Clicks_R.wav';
var sampleTerBuffer;
var sampleTerBufferSource;

var initBt = document.querySelector('#init');
var timeIt = document.querySelector('#time');
var playBt = document.querySelector('#play');
Expand Down Expand Up @@ -35,6 +41,35 @@ if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i)
};


function loadBuffer(url) {
var request = new XMLHttpRequest();

request.open('GET', url);
request.responseType = 'arraybuffer';

request.onerror = function() {
alert('Failed to load ' + url + ': ' + request.status + ' ' + request.statusText);
};

request.onload = function() {
if (request.status >= 400) {
request.onerror();
return;
}

audioContext.decodeAudioData(request.response, function(loaded) {
sampleTerBuffer = loaded;
console.log(loaded);
}, function() {
alert('Failed to decode audio file ' + url);
});
};

request.send();

}


function getChart(data){
var chart = c3.generate({
bindto: '#chart',
Expand Down Expand Up @@ -68,10 +103,15 @@ playBt.onclick = function(evt){
initTime = audioContext.currentTime;
sampleBis.currentTime = 0;
sampleBis.play();
sampleTerBufferSource = audioContext.createBufferSource();
sampleTerBufferSource.buffer = sampleTerBuffer;
sampleTerBufferSource.connect(audioContext.destination);
sampleTerBufferSource.start(0);
};

stopBt.onclick = function(evt){
sampleBis.pause();
sampleTerBufferSource.stop(0);
};

timeIt.onclick = function(evt){
Expand All @@ -80,7 +120,7 @@ timeIt.onclick = function(evt){
val2.textContent = audioContext.currentTime;
val4.textContent = diff;
var currentTimeDiff = sampleBis.currentTime-diff;
val5.textContent = currentTimeDiff;
val5.textContent = '' + currentTimeDiff + ' (' + (currentTimeDiff * audioContext.sampleRate) + ')';
var now = new Date();
var ms = now.getMilliseconds();
if(now.getMilliseconds() < 100){
Expand All @@ -90,8 +130,10 @@ timeIt.onclick = function(evt){
data[0].push(d);
data[1].push(currentTimeDiff);
getChart(data);
val6.textContent = average(data[1].slice(1));
val7.textContent = standardDeviation(data[1].slice(1));
var avg = average(data[1].slice(1));
val6.textContent = '' + avg + ' (' + (avg * audioContext.sampleRate) + ')';
var stdev = standardDeviation(data[1].slice(1));
val7.textContent = '' + stdev + ' (' + (stdev * audioContext.sampleRate) + ')';
};


Expand All @@ -113,6 +155,9 @@ var initFunction = function() {
source.connect(audioContext.destination);
source.start(0);
val2.textContent = audioContext.currentTime;

console.log('init');
loadBuffer(sampleTerUrl);
};

initBt.onclick = initFunction;
Expand Down
3 changes: 2 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,8 @@ <h1>Device Latency</h1>

<button id="init">Init AudioContext on iOS</button>
<br>
<audio src="gimme.mp3" id="sampleBis" auto controls></audio>
<audio src="60_Clicks_L.wav" id="sampleBis" auto controls></audio>
<audio src="60_Clicks_R.wav" id="sampleTer" auto controls></audio>


<br>
Expand Down