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| 1 <!doctype html> |
| 2 <html> |
| 3 <head> |
| 4 <title>Test AudioContext.getOutputTimestamp() method</title> |
| 5 <style type="text/css"> |
| 6 body { |
| 7 margin: 2em; |
| 8 } |
| 9 .manual-test-ui { |
| 10 font-family: Arial; |
| 11 padding: 1em; |
| 12 border: 1px solid #999; |
| 13 } |
| 14 .manual-test-ui button { |
| 15 padding: 1em; |
| 16 font-size: 1em; |
| 17 } |
| 18 .manual-test-ui div { |
| 19 padding: 10px; |
| 20 font-size: 1.5em; |
| 21 } |
| 22 </style> |
| 23 </head> |
| 24 |
| 25 <body> |
| 26 <h1>Test AudioContext.getOutputTimestamp() method</h1> |
| 27 |
| 28 <p>Tests the values returned from AudioContext.getOutputTimestamp()</p> |
| 29 |
| 30 <p>Press "Start" to run the test. You should hear a sine tone.</p> |
| 31 |
| 32 <p>Press "Refresh" to fetch the fresh output audio timestamp values |
| 33 and compare them to 'AudioContext.currentTime' and 'Performance.now()'. </
p> |
| 34 |
| 35 <p>When context is running the obtained audio timestamp and performance time
stamp values must be always |
| 36 slightly behind of 'AudioContext.currentTime' and 'Performance.now()' cor
respondingly.</p> |
| 37 |
| 38 <p>Please see <a href="https://webaudio.github.io/web-audio-api/#methods-1">
Web Audio |
| 39 API</a> for more details.</p> |
| 40 |
| 41 <div class="manual-test-ui"> |
| 42 <div id="audioTime"></div> |
| 43 <div id="performanceTime"></div> |
| 44 <div id="timestampContextTime"></div> |
| 45 <div id="timestampPerformanceTime"></div> |
| 46 |
| 47 <button id="startButton" onclick="start()">Start</button> |
| 48 <button id="valuesButton" onclick="refreshValues()">Refresh Values</button
> |
| 49 <button onclick="context.suspend()">Suspend</button> |
| 50 <button onclick="context.resume()">Resume</button> |
| 51 </div> |
| 52 |
| 53 <script type="text/javascript"> |
| 54 var context = new AudioContext(); |
| 55 |
| 56 refreshValues(); |
| 57 |
| 58 function start() { |
| 59 document.querySelector('#startButton').disabled = true; |
| 60 let oscillator = context.createOscillator(); |
| 61 oscillator.connect(context.destination); |
| 62 oscillator.start(); |
| 63 } |
| 64 |
| 65 function refreshValues() { |
| 66 document.querySelector("#audioTime").innerHTML = "context.currentTime: "
+ context.currentTime; |
| 67 document.querySelector("#performanceTime").innerHTML = "performance.now(
): " + performance.now(); |
| 68 |
| 69 let timestamp = context.getOutputTimestamp(); |
| 70 document.querySelector("#timestampContextTime").innerHTML = "timestamp a
udio: " + timestamp.contextTime; |
| 71 document.querySelector("#timestampPerformanceTime").innerHTML = "timesta
mp performance: " + timestamp.performanceTime; |
| 72 } |
| 73 </script> |
| 74 </body> |
| 75 </html> |
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Chromium Code Reviews
Issue 2060833002:
Implementation of 'AudioContext.getOutputTimestamp' method (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master