--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/submitted/W3C/disabled-audio-silence.html Tue Jun 04 15:45:18 2013 +0200
@@ -0,0 +1,58 @@
+<!doctype html>
+<html>
+<head>
+<title>A disabled audio track is rendered as silence</title>
+<link rel="author" title="Dominique Hazael-Massieux" href="mailto:dom@w3.org"/>
+<link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#navigatorusermedia">
+<link rel='stylesheet' href='/resources/testharness.css' media='all'/>
+</head>
+<body>
+<p>When prompted, accept to share your audio stream.</p>
+<h1>Description</h1>
+<p>This test checks that a disabled audio track in a MediaStream is rendered as silence. It relies on the <a href="https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html">Web Audio API</a>.</p>
+
+<div id='log'></div>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src=featuredetection.js></script>
+<script src=prefix.js></script>
+<script>
+var t = async_test("Tests that a disabled audio track in a MediaStream is rendered as silence", {timeout: 200000});
+var aud = document.getElementById("aud");
+t.step(function() {
+ navigator.getUserMedia({audio: true}, t.step_func(function (stream) {
+ // TODO remove when prefixes are gone
+ var api = BrowserHasFeature(window, "AudioContext");
+ if (!window.AudioContext && undefined !== api) {
+ window.AudioContext = api;
+ }
+ var ctx = new AudioContext();
+ var streamSource = ctx.createMediaStreamSource(stream);
+ var silenceDetector = ctx.createScriptProcessor(1024);
+ var count = 10;
+ silenceDetector.onaudioprocess = t.step_func(function (e) {
+ var buffer1 = e.inputBuffer.getChannelData(0);
+ var buffer2 = e.inputBuffer.getChannelData(1);
+ var out = e.outputBuffer.getChannelData(0);
+ out = new Float32Array(buffer1);
+ for (var i = 0; i < buffer1.length; i++) {
+ assert_equals(buffer1[i], 0, "Audio buffer entry #" + i + " in channel 0 is silent");
+ }
+ for (var i = 0; i < buffer2.length; i++) {
+ assert_equals(buffer2[i], 0, "Audio buffer entry #" + i + " in channel 1 is silent");
+ }
+ count--;
+ if (count === 0) {
+ silenceDetector.onaudioprocess = null;
+ t.done();
+ }
+ });
+ stream.getAudioTracks()[0].enabled = false;
+
+ streamSource.connect(silenceDetector);
+ silenceDetector.connect(ctx.destination);
+ }), function(error) {});
+});
+</script>
+</body>
+</html>