Chromium Code Reviews Chromium Code Reviews
Issue 10411007:
Add new PyAuto test for measuring audio tag latency. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src| OLD | NEW |
|---|---|
| (Empty) | |
| 1 <html> | |
|
scherkus (not reviewing)
2012/05/21 21:08:26
<!DOCTYPE html>
DaleCurtis
2012/05/21 22:22:01
Done.
| |
| 2 <head> | |
| 3 <title>Audio Loop Benchmark</title> | |
| 4 <style>* { font-family: monospace; }</style> | |
| 5 </head> | |
| 6 <body> | |
| 7 <h1>Audio Loop Benchmark</h1> | |
| 8 <p> | |
| 9 Benchmark measuring how fast we can continuously repeat a short sound | |
| 10 clip. In the ideal scenario we'd have zero latency processing script, | |
| 11 seeking back to the beginning of the clip, and resuming audio playback. | |
| 12 </p> | |
| 13 <p> | |
| 14 Using the loop attribute will avoid involving script to seek back to the | |
| 15 beginning of the clip, but testing reveals it isn't adding to latency. | |
| 16 </p> | |
| 17 | |
| 18 <input id="loop" type="checkbox" />Use loop attribute | |
|
scherkus (not reviewing)
2012/05/21 21:08:26
I'd either:
a) Remove loop related stuff
b) Ha
DaleCurtis
2012/05/21 22:22:01
Done. Made loop the default, cleaned up resulting
| |
| 19 <button onclick="startTest(document.getElementById('loop').checked);">Start< /button> | |
| 20 | |
| 21 <p> | |
| 22 Times Played: <span id="times"></span></span><br> | |
| 23 Clip Duration: <span id="clip"></span></span><br> | |
| 24 Ideal Duration: <span id="ideal"></span><br> | |
| 25 Actual Duration: <span id="actual"></span><br> | |
| 26 Average Latency: <span id="average"></span><br> | |
| 27 </p> | |
| 28 | |
| 29 <script> | |
| 30 var TIMES = 50, averageLatency = 0; | |
| 31 | |
| 32 function getAndClearElement(id) { | |
| 33 var elem = document.getElementById(id); | |
| 34 elem.innerText = ''; | |
| 35 return elem; | |
| 36 } | |
| 37 | |
| 38 function startTest(use_loop) { | |
| 39 var timesElem = getAndClearElement('times'); | |
| 40 var clipElem = getAndClearElement('clip'); | |
| 41 var idealElem = getAndClearElement('ideal'); | |
| 42 var actualElem = getAndClearElement('actual'); | |
| 43 var averageElem = getAndClearElement('average'); | |
| 44 var buttonElem = document.querySelector('button'); | |
| 45 | |
| 46 var loopCount = 0, idealDuration = 0, actualDuration = 0; | |
| 47 var startTime; | |
| 48 | |
| 49 buttonElem.disabled = true; | |
| 50 | |
| 51 function onLoaded() { | |
| 52 idealDuration = Math.round(audio.duration * TIMES * 1000, 0); | |
| 53 idealElem.innerText = idealDuration + ' ms'; | |
| 54 clipElem.innerText = Math.round(audio.duration * 1000, 0) + ' ms'; | |
| 55 | |
| 56 if (use_loop) { | |
| 57 audio.addEventListener('seeked', onLoop); | |
| 58 audio.loop = true; | |
| 59 } else { | |
| 60 audio.addEventListener('ended', onEnded); | |
| 61 audio.addEventListener('seeked', onSeeked); | |
| 62 } | |
| 63 startTime = new Date(); | |
| 64 audio.play(); | |
| 65 } | |
| 66 | |
| 67 var audio = document.createElement('audio'); | |
| 68 audio.addEventListener('canplaythrough', onLoaded); | |
| 69 audio.src = '../pink_noise_140ms.wav'; | |
| 70 | |
| 71 function isTestDone() { | |
| 72 ++loopCount; | |
| 73 timesElem.innerText = loopCount + '/' + TIMES; | |
| 74 if (loopCount == TIMES) { | |
| 75 actualDuration = new Date() - startTime; | |
| 76 actualElem.innerText = actualDuration + ' ms'; | |
| 77 buttonElem.disabled = false; | |
| 78 | |
| 79 averageLatency = (actualDuration - idealDuration) / loopCount; | |
| 80 averageElem.innerText = averageLatency + ' ms'; | |
| 81 | |
| 82 // Let the PyAuto test know we're done testing. | |
| 83 if (window.domAutomationController) | |
| 84 window.domAutomationController.send(true); | |
| 85 | |
| 86 return true; | |
| 87 } | |
| 88 | |
| 89 return false; | |
| 90 } | |
| 91 | |
| 92 function onEnded() { | |
| 93 if (!isTestDone()) | |
| 94 audio.currentTime = 0; | |
| 95 } | |
| 96 | |
| 97 function onSeeked() { | |
| 98 audio.play(); | |
| 99 } | |
| 100 | |
| 101 function onLoop() { | |
| 102 if (isTestDone()) | |
| 103 audio.pause(); | |
| 104 } | |
| 105 } | |
| 106 </script> | |
| 107 </body> | |
| 108 </html> | |
| OLD | NEW |
