JMF捕获技术（视频

        JMF通过MediaLocator(类似URL的一种媒体信息定位)来确定视频,音频或者某个音频文件在计算机中的具体位置.例如视频为vfw:Microsoft WDM Image Capture(Win32):0,多媒体文件为 file:c:\\music\123.mp3.

        知道了它的媒体信息的位置后,就可以构造一个播放器(MediaPlayer或有同样功能的Player),播放就可以了.

        使用MediaPlayer的start方法就可以启动播放器了,隐藏了具体的播放细节.JMF播放器有它的生存周期,分别是Unrealized,Realizing,Realized,Prefetching,Prefetched Started.通过监听器来由JVM来控制各种状态的转换,通过realize方法使播放器达到Realized状态,一旦达到这个状态,监听器检测到,我们再使用prefetch方法达到Prefetched状态,然后再调用start方法播放,就可以完成播放任何媒体的功能了,简单吧!

捕获视频代码

class CaptureVideo extends Frame implements ControllerListener {

       private CaptureDeviceInfo infor ;

private MediaLocator mediaLocator ;

       private String url = “vfw:Microsoft WDM Image Capture (Win32):0”;

       private Component com;

       private Panel panel ;

       MediaPlayer player;

public CaptureVideo() {

              infor = CaptureDeviceManager.getDevice(url);

              mediaLocator = infor.getLocator();

       }

       public void paly() {

              try {

                     player = Manager.createPlayer(mediaLocator);//利用mediaLocator创建Player

                     player.addControllerListener(this);

                     player.realize();

              } catch (NoPlayerException e) {

                     // TODO 自动生成 catch 块

                     e.printStackTrace();

              } catch (IOException e) {

                     // TODO 自动生成 catch 块

                     e.printStackTrace();

              }

       public void createComponent() {

              setTitle("视频信号");

              addWindowListener(new WinClose());

              setBounds(100,100,200,200);

              panel = new Panel();

              if((com = player.getVisualComponent()) != null) {

                     panel.add(com);

              }

              add(panel);

              setVisible(true);

       }

       public synchronized void controllerUpdate(ControllerEvent arg0) {

              // TODO 自动生成方法存根

              if(arg0 instanceof RealizeCompleteEvent) {

                     System.out.println("realized");

                     createComponent();                 //将播放器添加到Panel上

                     player.prefetch();

              }

              if(arg0 instanceof PrefetchCompleteEvent) {

                     player.start();

                     System.out.println("prefetched");

              }

       }

}

public class test {
        public static void main() {

                 CaptureVideo video = new CaptureVideo();

                 video.player();

        }

}