[AS3]as3中NetConnection、NetStream应用实例

怎么使用onMetaData和onCuePoint事件来处理视频的元数据和嵌入提示点。代码如下：

import mx.events.FlexEvent;  
          import mx.utils.ObjectUtil;  
          private var nc:NetConnection;  
          private var ns:NetStream;  
          private var video:Video;  
          private var meta:Object;  
 
          protected function init():void  
          {  
              // TODO Auto-generated method stub  
                
              var nsClient:Object = new Object();  
                
              nsClient.onMetaData = ns_onMetaData;  
                
              nsClient.onCuePoint = ns_onCuePoint;  
                
              nc = new NetConnection();  
                
              nc.connect(null);  
                
              ns = new NetStream(nc);  
                
              ns.play("http://192.168.0.50:81/TestRSL/avatar.flv");  
 
              ns.client = nsClient;  
                
              video = new Video();  
                
              video.attachNetStream(ns);  
                
              uic.addChild(video);  
                
          }  
            
          private function ns_onMetaData(item:Object):void  
          {  
              trace("meta");  
                
              meta = item;  
                
              video.width = item.width;  
              video.height = item.height;  
                
              uic.width = video.width;  
              uic.height = video.height;  
                
              panel.title = "frame rate:" + item.framerate;  
              panel.visible = true;  
                
              trace(ObjectUtil.toString(item));  
          }  
            
          private function ns_onCuePoint(item:Object):void  
          {  
              trace("cue");     
          }