chrome/test/data/media/html/media_stat_perf.html

   1 <!-- Used by media_stat_perf to calculate <video> performance statistics. -->
   2
   3 <!DOCTYPE html>
   4 <html lang="en-US">
   5   <head>
   6     <title>CPU, Memory, and FPS Perf Test</title>
   7   </head>
   8   <body>
   9     <div id="log">
  10       Decoded frames: 0 Avg: 0<br>
  11       Dropped frames: 0 Avg: 0<br>
  12     </div>
  13     <video preload controls></video>
  14   </body>
  15
  16   <script type="text/javascript">
  17     var video = document.querySelector("video");
  18
  19     function calculateStats() {
  20       if (video.readyState <= HTMLMediaElement.HAVE_CURRENT_DATA ||
  21           video.paused || video.ended)
  22         return;
  23       // Not all test files have same duration, so to make the tests run shorter
  24       // we need a time limit.
  25       // From aggregated data, 5 seconds is enough time to get reliable results.
  26       if (video.currentTime > 5) {
  27         video.currentTime = video.duration;
  28       }
  29
  30       currentTime = new Date().getTime();
  31       deltaTime = (currentTime - startTime) / 1000;
  32       startTime = currentTime;
  33
  34       // Calculate decoded frames per sec.
  35       var fps = (video.webkitDecodedFrameCount - decodedFrames) / deltaTime;
  36       decodedFrames = video.webkitDecodedFrameCount;
  37       decodedFPS.push(fps);
  38
  39       // Calculate dropped frames per sec.
  40       fps = (video.webkitDroppedFrameCount - droppedFrames) / deltaTime;
  41       droppedFrames = video.webkitDroppedFrameCount;
  42       droppedFPS.push(fps);
  43
  44       var d = document.getElementById("log");
  45       d.innerHTML =
  46         "Decoded frames: " + decodedFrames +
  47         " Avg: " + decodedFPS + " fps.<br>" +
  48         "Dropped frames: " + droppedFrames +
  49         " Avg: " + droppedFPS + " fps.<br>";
  50     }
  51
  52     video.addEventListener("playing", function(event) {
  53       decodedFrames = 0;
  54       droppedFrames = 0;
  55       decodedFPS = [];
  56       droppedFPS = [];
  57       startTime = new Date().getTime();
  58       intID = window.setInterval(calculateStats, 1000);
  59     });
  60
  61     video.addEventListener("error", function() { endTest(false); }, false);
  62     video.addEventListener("ended", function() { endTest(true); }, false);
  63
  64     function endTest(successFlag) {
  65       window.clearInterval(intID);
  66       // Notify PyAuto that we've completed the test run.
  67       if (window.domAutomationController)
  68         window.domAutomationController.send(successFlag);
  69     }
  70
  71     function startTest(url) {
  72       video.src = url;
  73       video.play();
  74     }
  75   </script>
  76 </html>