Chromium Code Reviews Chromium Code Reviews
Issue 1097373003:
Fix issue with failing to call AudioBufferSource.onended in some cases (Closed)
Base URL: svn://svn.chromium.org/blink/trunk| OLD | NEW |
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| (Empty) | |
| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test AudioBufferSource.onended</title> | |
| 5 <style type="text/css"> | |
| 6 header { | |
| 7 margin: 20px 0; | |
| 8 } | |
| 9 #results { | |
| 10 white-space: pre; | |
| 11 font-family: monospace; | |
| 12 } | |
| 13 </style> | |
| 14 </head> | |
| 15 | |
| 16 <body> | |
| 17 <h1>Test AudioBufferSource.onended</h1> | |
| 18 | |
| 19 <p>Tests that the onended event is called. This test cannot be run in an of fline context | |
| 20 because the onended event is always called. | |
| 21 </p> | |
| 22 | |
| 23 <p>Press "Test" button to run the test. You should hear two tones, each las ting 1/2 second. If | |
| 24 you do not, the test failed and onended was not correctly fired to generate the second tone. | |
| 25 There should also be messages displayed for each tone played. | |
| 26 </p> | |
| 27 | |
| 28 <button onclick="runTest()">Test</button> | |
| 29 | |
| 30 <header>Results</header> | |
| 31 <div id="results"></div> | |
| 32 | |
| 33 <script> | |
| 34 // This is a slightly modified version of http://jsfiddle.net/ep4zm233/ | |
| 35 | |
| 36 var context = new AudioContext(); | |
|
Ken Russell (switch to Gerrit)
2015/04/22 19:01:50
Could you please invest a little more time thinkin
Raymond Toy
2015/04/22 20:19:45
This is fairly hard to test, even with an online c
hongchan
2015/04/22 22:30:32
With the testRunner, capturing the actual audio st
| |
| 37 | |
| 38 function runTest() { | |
| 39 log("Starting test"); | |
| 40 | |
| 41 // Create two buffers at a sample rate of 8000. We're assuming 8000 is n ot the actual | |
| 42 // context sampleRate so that resampling happens during the play back of the buffers. | |
| 43 var bufferRate = 8000; | |
| 44 var bufferSeconds = 0.5; | |
| 45 var bufferFrames = bufferSeconds * bufferRate; | |
| 46 | |
| 47 // The tone buffers at 400Hz and 600 Hz. | |
| 48 var sin400 = context.createBuffer(1, bufferFrames, bufferRate); | |
| 49 var sin600 = context.createBuffer(1, bufferFrames, bufferRate); | |
| 50 | |
| 51 var d400 = sin400.getChannelData(0); | |
| 52 var d600 = sin600.getChannelData(0); | |
| 53 | |
| 54 var omega = 2*Math.PI/bufferRate; | |
| 55 | |
| 56 for (var k = 0; k < bufferFrames; ++k) { | |
| 57 d400[k] = Math.sin(omega * 400 * k); | |
| 58 d600[k] = Math.sin(omega * 600 * k); | |
| 59 } | |
| 60 | |
| 61 var s1 = context.createBufferSource(); | |
| 62 | |
| 63 s1.onended = function () { | |
| 64 // Create a new source using the 600Hz buffer and play it as soon as t he onended event for | |
| 65 // s1 has fired. | |
| 66 var s2 = context.createBufferSource(); | |
| 67 s2.connect(context.destination); | |
| 68 s2.buffer = sin600; | |
| 69 s2.start(); | |
| 70 log("Tone 2"); | |
| 71 } | |
| 72 | |
| 73 // Set up the 400 Hz buffer and play it. | |
| 74 s1.buffer = sin400; | |
| 75 | |
| 76 s1.connect(context.destination); | |
| 77 s1.start(); | |
| 78 log("Tone 1"); | |
| 79 } | |
| 80 | |
| 81 function clearResults() { | |
| 82 var results = document.querySelector("#results"); | |
| 83 results.textContent = ""; | |
| 84 } | |
| 85 | |
| 86 function log(message) { | |
| 87 console.log(message); | |
| 88 var results = document.querySelector("#results"); | |
| 89 results.textContent += message + "\n"; | |
| 90 } | |
| 91 </script> | |
| 92 | |
| 93 | |
| 94 | |
| 95 | |
| 96 </body> | |
| 97 </html> | |
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