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+<!DOCTYPE HTML>
+<html>
+<head>
+ <title>Test whether an audio file played with a volume set to 0 plays silence</title>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<audio preload=none src="ting-48k-1ch.ogg" controls> </audio>
+<script>
+ SimpleTest.waitForExplicitFinish();
+
+ var count = 20;
+
+ function isSilent(b) {
+ for (var i = 0; i < b.length; b++) {
+ if (b[i] != 0.0) {
+ return false;
+ }
+ }
+ return true;
+ }
+
+ var a = document.getElementsByTagName("audio")[0];
+ a.volume = 0.0;
+ var ac = new AudioContext();
+ var measn = ac.createMediaElementSource(a);
+ var sp = ac.createScriptProcessor();
+
+ sp.onaudioprocess = function(e) {
+ var inputBuffer = e.inputBuffer.getChannelData(0);
+ ok(isSilent(inputBuffer), "The volume is set to 0, so all the elements of the buffer are supposed to be equal to 0.0");
+ }
+ // Connect the MediaElementAudioSourceNode to the ScriptProcessorNode to check
+ // the audio volume.
+ measn.connect(sp);
+ a.play();
+
+ a.addEventListener("ended", function() {
+ sp.onaudioprocess = null;
+ SimpleTest.finish();
+ });
+
+</script>
+</body>
+</html>