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AS3 Parse TimedText (TT) XML Captions File

/ Published in: ActionScript 3
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TimedText (TT) XML captions files can have namespaces that cause problems when parsing them in AS3. To get around this you can use this code to remove the namespace from the root XML node using Regex. This example uses

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  1. package 
  2. {
  3. 	import flash.display.Sprite;
  4. 	import flash.events.Event;
  5. 	import flash.net.URLLoader;
  6. 	import flash.net.URLLoaderDataFormat;
  7. 	import flash.net.URLRequest;
  8.  
  9. 	public class Main extends Sprite 
  10. 	{
  11. 		private var _xmlFilename:String = "captions.xml";
  12. 		private var _subtitlesXml:XML;
  13.  
  14. 		public function Main():void 
  15. 		{
  16. 			if (stage) init();
  17. 			else addEventListener(Event.ADDED_TO_STAGE, init);
  18. 		}
  19.  
  20. 		private function init(e:Event = null):void 
  21. 		{
  22. 			removeEventListener(Event.ADDED_TO_STAGE, init);
  23. 			var urlLoader:URLLoader = new URLLoader();
  24. 			urlLoader.dataFormat = URLLoaderDataFormat.TEXT;
  25. 			urlLoader.addEventListener(Event.COMPLETE, onSubtitlesXmlLoadComplete);
  26. 			urlLoader.load(new URLRequest(_xmlFilename));
  27. 		}
  28.  
  29. 		private function onSubtitlesXmlLoadComplete(e:Event):void 
  30. 		{
  31. 			_subtitlesXml = new XML(e.target.data);
  32. 			trace("ORIGINAL TIMEDTEXT XML:\n" + _subtitlesXml.toString());
  33. 			var myXmlStr:String = _subtitlesXml.toString();
  34. 			var xmlnsPattern:RegExp = new RegExp("xmlns[^\"]*\"[^\"]*\"", "gi");
  35. 			myXmlStr = myXmlStr.replace(xmlnsPattern, "");
  36. 			myXmlStr = myXmlStr.replace("aaa:lang=\"en\"", "");
  37. 			_subtitlesXml = new XML(myXmlStr);
  38. 			trace("MODIFIED TIMEDTEXT XML:\n" + _subtitlesXml.toString());
  39.  
  40. 			var numCaptions:int = _subtitlesXml.body.div.p.length();
  41. 			trace("numCaptions: " + numCaptions);
  42. 		}
  43.  
  44. 	}
  45. }
  46.  
  47.  
  48. /////////////////////////////////////////////////////////////////////
  49. // captions.xml
  50. /////////////////////////////////////////////////////////////////////
  51. <?xml version="1.0" encoding="UTF-8"?>
  52. <tt xml:lang="en" xmlns="http://www.w3.org/2006/04/ttaf1"  xmlns:tts="http://www.w3.org/2006/04/ttaf1#styling">
  53.   <head>
  54.     <styling>
  55.     </styling>
  56.   </head>
  57.   <body>
  58.     <div>
  59.       <p begin="00:00:00.440">Caption 1 here</p>
  60.       <p begin="00:00:08.799">Caption 2 here</p>
  61.     </div>
  62.   </body>
  63. </tt>
  64.  
  65.  
  66. /////////////////////////////////////////////////////////////////////
  67. // OUTPUT
  68. /////////////////////////////////////////////////////////////////////
  69. ORIGINAL TIMEDTEXT XML:
  70. <tt aaa:lang="en" xmlns="http://www.w3.org/2006/04/ttaf1" xmlns:tts="http://www.w3.org/2006/04/ttaf1#styling" xmlns:aaa="http://www.w3.org/XML/1998/namespace">
  71.   <head>
  72.     <styling/>
  73.   </head>
  74.   <body>
  75.     <div>
  76.       <p begin="00:00:00.440">Caption 1 here</p>
  77.       <p begin="00:00:08.799">Caption 2 here</p>
  78.     </div>
  79.   </body>
  80. </tt>
  81. MODIFIED TIMEDTEXT XML:
  82. <tt>
  83.   <head>
  84.     <styling/>
  85.   </head>
  86.   <body>
  87.     <div>
  88.       <p begin="00:00:00.440">Caption 1 here</p>
  89.       <p begin="00:00:08.799">Caption 2 here</p>
  90.     </div>
  91.   </body>
  92. </tt>
  93. numCaptions: 2

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