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How to measure download speed (Kilobytes per second) in AS3

/ Published in: ActionScript 3
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A simple snippet showing how to display download speed (Kilobytes per second or kbs/s) in flash timeline script (AS3). You can use Flash "Simulate Download" option for testing.

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  1. var howManyTimes:Number = 3; //How many times per second  the download speed will be traced
  2. var bytesLoaded:Number = 0; //don't change, necessary for calculation
  3. var lastTime:int = 0; //don't change, necessary for calculation
  4. var content:DisplayObject; //this variable will hold the content loaded
  5.  
  6. var loader:Loader = new Loader();
  7. loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, kbsPerSec);
  8. loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
  9. lastTime = getTimer();
  10. loader.load(new URLRequest("heavy_image.jpg"));
  11.  
  12. //kbsPerSec listens to ProgressEvent.PROGRESS and traces the download speed "howManyTimes" times per second
  13. function kbsPerSec(event:ProgressEvent):void
  14. {
  15. 	var time:int = getTimer();
  16. 	if(time - lastTime >= (1000/howManyTimes))
  17. 	{
  18. 		var kiloBytes:Number = (event.bytesLoaded - bytesLoaded)/1000;
  19. 		var timeInSecs:Number = (time - lastTime)/1000;
  20.  
  21. 		var kbsPerSecVal:Number = Math.floor(kiloBytes/timeInSecs);
  22. 		trace(kbsPerSecVal + " kbs/s");
  23. 		bytesLoaded = event.bytesLoaded;
  24. 		lastTime = getTimer();
  25. 	}
  26. }
  27.  
  28. function onComplete(event:Event):void
  29. {
  30. 	loader.contentLoaderInfo.removeEventListener(Event.COMPLETE, onComplete);
  31. 	loader.contentLoaderInfo.removeEventListener(ProgressEvent.PROGRESS, kbsPerSec);
  32. 	content = loader.content;
  33. 	loader = null;
  34. 	this.addChild(content);
  35. }

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