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 <!DOCTYPE html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Audio Loop Benchmark</title> | |
| 5 <style>* { font-family: monospace; }</style> | |
| 6 </head> | |
| 7 <body> | |
| 8 <h1>Audio Loop Benchmark</h1> | |
| 9 <p> | |
| 10 Benchmark measuring how fast we can continuously repeat a short sound | |
| 11 clip. In the ideal scenario we'd have zero latency processing script, | |
| 12 seeking back to the beginning of the clip, and resuming audio playback. | |
| 13 </p> | |
| 14 | |
| 15 <button onclick="startTest();">Start</button> | |
| 16 | |
| 17 <p> | |
| 18 Times Played: <span id="times"></span></span><br> | |
| 19 Clip Duration: <span id="clip"></span></span><br> | |
| 20 Ideal Duration: <span id="ideal"></span><br> | |
| 21 Actual Duration: <span id="actual"></span><br> | |
| 22 Average Latency: <span id="average"></span><br> | |
| 23 </p> | |
| 24 | |
| 25 <script> | |
| 26 var TIMES = 50, averageLatency = 0; | |
| 27 | |
| 28 function getAndClearElement(id) { | |
| 29 var elem = document.getElementById(id); | |
| 30 elem.innerText = ''; | |
| 31 return elem; | |
| 32 } | |
| 33 | |
| 34 function startTest() { | |
| 35 var timesElem = getAndClearElement('times'); | |
| 36 var clipElem = getAndClearElement('clip'); | |
| 37 var idealElem = getAndClearElement('ideal'); | |
| 38 var actualElem = getAndClearElement('actual'); | |
| 39 var averageElem = getAndClearElement('average'); | |
| 40 var buttonElem = document.querySelector('button'); | |
| 41 | |
| 42 var loopCount = 0, idealDuration = 0, actualDuration = 0; | |
| 43 var startTime; | |
| 44 | |
| 45 buttonElem.disabled = true; | |
| 46 | |
| 47 function onLoaded() { | |
| 48 idealDuration = Math.round(audio.duration * TIMES * 1000, 0); | |
| 49 idealElem.innerText = idealDuration + ' ms'; | |
| 50 clipElem.innerText = Math.round(audio.duration * 1000, 0) + ' ms'; | |
| 51 audio.addEventListener('seeked', onLoop); | |
| 52 startTime = new Date(); | |
| 53 audio.play(); | |
| 54 } | |
| 55 | |
| 56 var audio = document.createElement('audio'); | |
| 57 audio.addEventListener('canplaythrough', onLoaded); | |
| 58 audio.loop = true; | |
| 59 audio.src = '../pink_noise_140ms.wav'; | |
| 60 | |
| 61 function onLoop() { | |
| 62 ++loopCount; | |
| 63 timesElem.innerText = loopCount + '/' + TIMES; | |
| 64 if (loopCount == TIMES) { | |
| 65 actualDuration = new Date() - startTime; | |
|
scherkus (not reviewing)
2012/05/21 22:30:30
nit: sorry for not commenting earlier but we shoul
DaleCurtis
2012/05/21 22:34:57
Done. Raises the results from ~52ms to ~55ms.
| |
| 66 actualElem.innerText = actualDuration + ' ms'; | |
| 67 buttonElem.disabled = false; | |
| 68 | |
| 69 averageLatency = (actualDuration - idealDuration) / loopCount; | |
| 70 averageElem.innerText = averageLatency + ' ms'; | |
| 71 | |
| 72 // Let the PyAuto test know we're done testing. | |
| 73 if (window.domAutomationController) | |
| 74 window.domAutomationController.send(true); | |
| 75 | |
| 76 audio.pause(); | |
| 77 } | |
| 78 } | |
| 79 } | |
| 80 </script> | |
| 81 </body> | |
| 82 </html> | |
| OLD | NEW |
