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| Index: chrome/test/data/media/html/audio_latency_perf.html |
| diff --git a/chrome/test/data/media/html/audio_latency_perf.html b/chrome/test/data/media/html/audio_latency_perf.html |
| new file mode 100644 |
| index 0000000000000000000000000000000000000000..41ada7ad1335e1a5f62dde8ff84831a96ccf3acd |
| --- /dev/null |
| +++ b/chrome/test/data/media/html/audio_latency_perf.html |
| @@ -0,0 +1,108 @@ |
| +<html> |
|
scherkus (not reviewing)
2012/05/21 21:08:26
<!DOCTYPE html>
DaleCurtis
2012/05/21 22:22:01
Done.
|
| + <head> |
| + <title>Audio Loop Benchmark</title> |
| + <style>* { font-family: monospace; }</style> |
| + </head> |
| + <body> |
| + <h1>Audio Loop Benchmark</h1> |
| + <p> |
| + Benchmark measuring how fast we can continuously repeat a short sound |
| + clip. In the ideal scenario we'd have zero latency processing script, |
| + seeking back to the beginning of the clip, and resuming audio playback. |
| + </p> |
| + <p> |
| + Using the loop attribute will avoid involving script to seek back to the |
| + beginning of the clip, but testing reveals it isn't adding to latency. |
| + </p> |
| + |
| + <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
|
| + <button onclick="startTest(document.getElementById('loop').checked);">Start</button> |
| + |
| + <p> |
| + Times Played: <span id="times"></span></span><br> |
| + Clip Duration: <span id="clip"></span></span><br> |
| + Ideal Duration: <span id="ideal"></span><br> |
| + Actual Duration: <span id="actual"></span><br> |
| + Average Latency: <span id="average"></span><br> |
| + </p> |
| + |
| + <script> |
| + var TIMES = 50, averageLatency = 0; |
| + |
| + function getAndClearElement(id) { |
| + var elem = document.getElementById(id); |
| + elem.innerText = ''; |
| + return elem; |
| + } |
| + |
| + function startTest(use_loop) { |
| + var timesElem = getAndClearElement('times'); |
| + var clipElem = getAndClearElement('clip'); |
| + var idealElem = getAndClearElement('ideal'); |
| + var actualElem = getAndClearElement('actual'); |
| + var averageElem = getAndClearElement('average'); |
| + var buttonElem = document.querySelector('button'); |
| + |
| + var loopCount = 0, idealDuration = 0, actualDuration = 0; |
| + var startTime; |
| + |
| + buttonElem.disabled = true; |
| + |
| + function onLoaded() { |
| + idealDuration = Math.round(audio.duration * TIMES * 1000, 0); |
| + idealElem.innerText = idealDuration + ' ms'; |
| + clipElem.innerText = Math.round(audio.duration * 1000, 0) + ' ms'; |
| + |
| + if (use_loop) { |
| + audio.addEventListener('seeked', onLoop); |
| + audio.loop = true; |
| + } else { |
| + audio.addEventListener('ended', onEnded); |
| + audio.addEventListener('seeked', onSeeked); |
| + } |
| + startTime = new Date(); |
| + audio.play(); |
| + } |
| + |
| + var audio = document.createElement('audio'); |
| + audio.addEventListener('canplaythrough', onLoaded); |
| + audio.src = '../pink_noise_140ms.wav'; |
| + |
| + function isTestDone() { |
| + ++loopCount; |
| + timesElem.innerText = loopCount + '/' + TIMES; |
| + if (loopCount == TIMES) { |
| + actualDuration = new Date() - startTime; |
| + actualElem.innerText = actualDuration + ' ms'; |
| + buttonElem.disabled = false; |
| + |
| + averageLatency = (actualDuration - idealDuration) / loopCount; |
| + averageElem.innerText = averageLatency + ' ms'; |
| + |
| + // Let the PyAuto test know we're done testing. |
| + if (window.domAutomationController) |
| + window.domAutomationController.send(true); |
| + |
| + return true; |
| + } |
| + |
| + return false; |
| + } |
| + |
| + function onEnded() { |
| + if (!isTestDone()) |
| + audio.currentTime = 0; |
| + } |
| + |
| + function onSeeked() { |
| + audio.play(); |
| + } |
| + |
| + function onLoop() { |
| + if (isTestDone()) |
| + audio.pause(); |
| + } |
| + } |
| + </script> |
| + </body> |
| +</html> |
