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| 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(); |
| 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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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