| <!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#introduction"> |
| <link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreams-as-media-elements"> |
| </head> |
| <body> |
| <p class="instructions">When prompted, accept to share your audio stream.</p> |
| <h1 class="instructions">Description</h1> |
| <p class="instructions">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> |
| var t = async_test("Tests that a disabled audio track in a MediaStream is rendered as silence"); |
| var aud = document.getElementById("aud"); |
| t.step(function() { |
| navigator.mediaDevices.getUserMedia({audio: true}).then(t.step_func(function (stream) { |
| 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> |
