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POIs Web Audio API source.start(0) supported on Safari (it works just fine on Chrome)?
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  1. POIs Web Audio API source.start(0) supported on Safari (it works just fine on Chrome)?
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    copied!<p>I'm trying to implement Web Audio API. The code works on Chrome 29.0.1547.76 but not on Safari 6.0.5 (8536.30.1). The key is whether I use noteOn(0) or start(0).</p> <p>I want to use start() so that I can play part of a sound: </p> <pre><code>asource.start(0, 2, 1); </code></pre> <p>works fine in Chrome (plays immediately, starts at the 2 s mark, plays for 1 s) but results in </p> <pre><code>TypeError: 'undefined' is not a function (evaluating 'asource.start(0, 2, 1)') </code></pre> <p>on Safari. Replacing that one line with</p> <pre><code>asource.noteOn(0); </code></pre> <p>works. [Well, I need to call noteOff(0) instead of stop(0).] I get the same error with start(0). So, I'm assuming that Safari does not implement start(0)? But if so, why do some of the examples at <a href="http://www.html5rocks.com/en/tutorials/webaudio/intro/#toc-context" rel="nofollow">HTML5 Rocks</a> that use start(0) work?</p> <p>For reference, here's the complete web page. I've tried many different sounds/formats; all result in the same error.</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html lang=en&gt; &lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;title&gt;Web Audio API Issue&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;p&gt;Example working on Chrome but not Safari when using start()&lt;/p&gt; &lt;button id="Load" onclick="init()" &gt;Load&lt;/button&gt; &lt;button id="Play" onclick="playSound()" disabled&gt;Play&lt;/button&gt; &lt;button id="Stop" onclick="stopSound()" disabled&gt;Stop&lt;/button&gt; &lt;script&gt; var web_audio_context; var abuffer; var asource; function init() { contextClass = (window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext); web_audio_context = new contextClass(); var theURL = './digits.mp3'; var xhr = new XMLHttpRequest(); xhr.open('GET', theURL, true); xhr.responseType = 'arraybuffer'; xhr.onload = function(e) { finishedLoading(this.response); }; xhr.send(); } function finishedLoading(arrayBuffer) { web_audio_context.decodeAudioData(arrayBuffer, function(buffer) { abuffer = buffer; document.getElementById('Load').disabled = true; document.getElementById('Play').disabled = false; document.getElementById('Stop').disabled = false; }, function(e) { console.log('Error decoding file', e); }); } function playSound() { asource = web_audio_context.createBufferSource(); asource.buffer = abuffer; asource.connect(web_audio_context.destination); asource.start(0, 2, 1); } function stopSound() { asource.stop(0); } &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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