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1 <!doctype html> | |
2 <html> | |
3 <head> | |
4 <title>A disabled audio track is rendered as silence</title> | |
5 <link rel="author" title="Dominique Hazael-Massieux" href="mailto:dom@w3.org"/> | |
6 <link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#in
troduction"> | |
7 <link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#me
diastreams-as-media-elements"> | |
8 </head> | |
9 <body> | |
10 <p class="instructions">When prompted, accept to share your audio stream.</p> | |
11 <h1 class="instructions">Description</h1> | |
12 <p class="instructions">This test checks that a disabled audio track in a | |
13 MediaStream is rendered as silence. It relies on the | |
14 <a href="https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html"> | |
15 Web Audio API</a>.</p> | |
16 | |
17 <div id='log'></div> | |
18 <script src=/resources/testharness.js></script> | |
19 <script src=/resources/testharnessreport.js></script> | |
20 <script src="/common/vendor-prefix.js" data-prefixed-objects='[{"ancestors":["na
vigator"], "name":"getUserMedia"}, {"ancestors":["window"], "name":"AudioContext
"}]'></script> | |
21 <script> | |
22 var t = async_test("Tests that a disabled audio track in a MediaStream is render
ed as silence", {timeout: 200000}); | |
23 var aud = document.getElementById("aud"); | |
24 t.step(function() { | |
25 navigator.getUserMedia({audio: true}, t.step_func(function (stream) { | |
26 var ctx = new AudioContext(); | |
27 var streamSource = ctx.createMediaStreamSource(stream); | |
28 var silenceDetector = ctx.createScriptProcessor(1024); | |
29 var count = 10; | |
30 silenceDetector.onaudioprocess = t.step_func(function (e) { | |
31 var buffer1 = e.inputBuffer.getChannelData(0); | |
32 var buffer2 = e.inputBuffer.getChannelData(1); | |
33 var out = e.outputBuffer.getChannelData(0); | |
34 out = new Float32Array(buffer1); | |
35 for (var i = 0; i < buffer1.length; i++) { | |
36 assert_equals(buffer1[i], 0, "Audio buffer entry #" + i + " in channel
0 is silent"); | |
37 } | |
38 for (var i = 0; i < buffer2.length; i++) { | |
39 assert_equals(buffer2[i], 0, "Audio buffer entry #" + i + " in channel
1 is silent"); | |
40 } | |
41 count--; | |
42 if (count === 0) { | |
43 silenceDetector.onaudioprocess = null; | |
44 t.done(); | |
45 } | |
46 }); | |
47 stream.getAudioTracks()[0].enabled = false; | |
48 | |
49 streamSource.connect(silenceDetector); | |
50 silenceDetector.connect(ctx.destination); | |
51 }), function(error) {}); | |
52 }); | |
53 </script> | |
54 </body> | |
55 </html> | |
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