Flex调用摄像头

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
 <![CDATA[
   public var v_camera:Camera;
  //开始视频
  public function startCamera():void{
   v_camera=Camera.getCamera();
   S_Video.attachCamera(v_camera);
  }
  //暂停
  public function stopCamera():void{
   S_Video.attachCamera(null);
  }
 ]]>
</mx:Script>
 <mx:VideoDisplay x="170" y="29" width="444" height="267" id="S_Video"/>
 <mx:Button x="170" y="304" label="开始" click="startCamera()"/>
 <mx:Button x="566" y="304" label="暂停" click="stopCamera()"/>
 
</mx:Application>