MediaStreamTrack-MediaElement-disabled-audio-is-silence.https.html (2390B)
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#introduction"> 7 <link rel="help" href="http://dev.w3.org/2011/webrtc/editor/getusermedia.html#mediastreams-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=/resources/testdriver.js></script> 21 <script src=/resources/testdriver-vendor.js></script> 22 <script src=permission-helper.js></script> 23 <script> 24 const aud = document.getElementById("aud"); 25 promise_test(async t => { 26 await setMediaPermission("granted", ["microphone"]); 27 const stream = await navigator.mediaDevices.getUserMedia({audio: true}); 28 var ctx = new AudioContext(); 29 var streamSource = ctx.createMediaStreamSource(stream); 30 var silenceDetector = ctx.createScriptProcessor(1024); 31 var count = 10; 32 let resolveAudioProcessPromise; 33 const audioProcessed = new Promise(res => resolveAudioProcessPromise = res) 34 35 silenceDetector.onaudioprocess = function (e) { 36 var buffer1 = e.inputBuffer.getChannelData(0); 37 var buffer2 = e.inputBuffer.getChannelData(1); 38 var out = e.outputBuffer.getChannelData(0); 39 out = new Float32Array(buffer1); 40 for (var i = 0; i < buffer1.length; i++) { 41 assert_equals(buffer1[i], 0, "Audio buffer entry #" + i + " in channel 0 is silent"); 42 } 43 for (var i = 0; i < buffer2.length; i++) { 44 assert_equals(buffer2[i], 0, "Audio buffer entry #" + i + " in channel 1 is silent"); 45 } 46 count--; 47 if (count === 0) { 48 silenceDetector.onaudioprocess = null; 49 resolveAudioProcessPromise(); 50 } 51 }; 52 stream.getAudioTracks()[0].enabled = false; 53 54 streamSource.connect(silenceDetector); 55 silenceDetector.connect(ctx.destination); 56 }, "Tests that a disabled audio track in a MediaStream is rendered as silence"); 57 </script> 58 </body> 59 </html>