I am finding it impossible to play any audio through Web Audio API on iPad. This is using the latest version of iOS (currently 9.3.2).
I have done a lot of investigation and testing on this. There are a number of threads online, the latest issue being autumn 2015. They talk about firing audio from a touchstart event to unlock it (or touchend while there were issues). I have tried them all and cannot get touchstart, touchend or click to work.
Here is a very simple test I have set up isolating the problem.
None of the tests work on iPad for me. No problems on iPhone or other compatible browsers.
There is another test page here.
Again none of those sounds play for me on two iPads I have tried (one old, one new).
Any insights or feedback would be much appreciated. Hoping to find a resolution to this for myself and others. I will answer here if I find a solution.
Here is the test code:
<!DOCTYPE html>
<html>
<head>
<title>Web Audio API - iPad Test</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="./jquery-2.2.3.min.js"></script>
<style>
section { padding:10px; margin:0 0 10px; background:DarkSeaGreen }
a { cursor:pointer; display:block; background: DarkSeaGreen; padding:10px; margin:0 0 3px }
</style>
</head>
<body>
<script>
var app = {};
$(document).ready(function() {
// Do we have Web Audio API?
try {
window.AudioContext = window.AudioContext || window.webkitAudioContext;
audioContext = new AudioContext();
} catch (e) {
alert('Web Audio API is not supported in this browser');
}
$('#loadClick').on('click',function(){load('./ipad_test.mp3')});
$('#playTouchEnd').on('touchend',play);
$('#playTouchStart').on('touchstart',play);
$('#playClick').on('click',play);
$('#unlockTouchEnd').on('touchend',unlock);
$('#unlockTouchStart').on('touchstart',unlock);
$('#unlockClick').on('click',unlock);
});
function unlock() {
// play empty buffer to unmute audio
var buffer = audioContext.createBuffer(1, 1, 22050);
var source = audioContext.createBufferSource();
source.audioContext = buffer;
source.connect(audioContext.destination);
source.start(0);
$('#messages').append('<p>Unlocked.</p>');
}
function load(file) {
if(app.loaded) {
$('#messages').append('<p>Already loaded.</p>');
return;
}
var request = new XMLHttpRequest();
request.open ('GET', file, true);
request.responseType = 'arraybuffer';
request.onload = function () {
audioContext.decodeAudioData(
request.response,
function (buffer) {
app.buffer = buffer;
$('#messages').append('<p>Loaded.</p>');
app.loaded = 1;
},
function(){alert('Load error.');}
)
};
request.send();
}
function play() {
if(!app.loaded) {
$('#messages').append('<p>Please load before playing.</p>');
return;
}
var sourceNode = audioContext.createBufferSource();
sourceNode.buffer = app.buffer;
sourceNode.connect (audioContext.destination);
sourceNode.start(0);
$('#messages').append('<p>Playing.</p>');
}
</script>
<h1>Web Audio API Test</h1>
<p>Unlock should not be needed at all, but offers an alternative way to try and get the audio going. Load and then play should be all any compatible device needs. Refresh to start again.</p>
<a id="unlockTouchEnd">Unlock (touchend)</a>
<a id="unlockTouchStart">Unlock (touchstart)</a>
<a id="unlockClick">Unlock (click)</a>
<a id="loadClick" style="background:#c0c0c0">Load (click)</a>
<a id="playTouchEnd">Play Audio (touchend)</a>
<a id="playTouchStart">Play Audio (touchstart)</a>
<a id="playClick">Play Audio (click)</a>
<section id="messages"></section>
</body>
</html>
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