JMF示例（二）
import javax.media. * ;
import com.sun.media.ui. * ;
import javax.media.protocol. * ;
import javax.media.protocol.DataSource;
import javax.swing. * ;
import javax.swing. event . * ;
import java.awt. * ;
import java.awt. event . * ;
import java.net. * ;
import java.io. * ;
import java.util.Vector;
public class MDIApp extends Frame
{
/* ************************************************************************
* MAIN PROGRAM / STATIC METHODS
************************************************************************ */
public static void main(String args[])
{
MDIApp mdi = new MDIApp();
}
static void Fatal(String s)
{
MessageBox mb = new MessageBox( " JMF Error " , s);
}
/* ************************************************************************
* VARIABLES
************************************************************************ */
JMFrame jmframe = null ;
JDesktopPane desktop;
FileDialog fd = null ;
CheckboxMenuItem cbAutoLoop = null ;
Player player = null ;
Player newPlayer = null ;
String filename;
/* ************************************************************************
* METHODS
************************************************************************ */
public MDIApp()
{
super( " Java Media Player " );
// Add the desktop pane
setLayout( new BorderLayout() );
desktop = new JDesktopPane();
desktop.setDoubleBuffered( true ); // 设置双缓存
add( " Center " , desktop);
setMenuBar(createMenuBar());
setSize( 640 , 480 );
setVisible( true );
try
{
UIManager.setLookAndFeel( " javax.swing.plaf.metal.MetalLookAndFeel " );
}
catch (Exception e)
{
System.err.println( " Could not initialize java.awt Metal lnf " );
}
addWindowListener( new WindowAdapter() {
public void windowClosing(WindowEvent we) {
System.exit( 0 );
}
} );
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, new Boolean( true ));
}
private MenuBar createMenuBar()
{
ActionListener al = new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
String command = ae.getActionCommand();
if (command.equals( " Open " ))
{
if (fd == null )
{
fd = new FileDialog(MDIApp. this , " Open File " ,
FileDialog.LOAD);
fd.setDirectory( " /movies " );
}
fd.show();
if (fd.getFile() != null )
{
String filename = fd.getDirectory() + fd.getFile();
openFile( " file: " + filename);
}
}
else if (command.equals( " Exit " ))
{
dispose();
System.exit( 0 );
}
}
};
MenuItem item;
MenuBar mb = new MenuBar();
// File Menu
Menu mnFile = new Menu( " File " );
mnFile.add(item = new MenuItem( " Open " ));
item.addActionListener(al);
mnFile.add(item = new MenuItem( " Exit " ));
item.addActionListener(al);
// Options Menu
Menu mnOptions = new Menu( " Options " );
cbAutoLoop = new CheckboxMenuItem( " Auto replay " );
cbAutoLoop.setState( true );
mnOptions.add(cbAutoLoop);
mb.add(mnFile);
mb.add(mnOptions);
return mb;
}
/* *
* Open a media file.
*/
public void openFile(String filename)
{
String mediaFile = filename;
Player player = null ;
// URL for our media file
URL url = null ;
try
{
// Create an url from the file name and the url to the
// document containing this applet.
if ((url = new URL(mediaFile)) == null )
{
Fatal( " Can't build URL for " + mediaFile);
return ;
}
// Create an instance of a player for this media
try
{
player = Manager.createPlayer(url); // 创建播放器
}
catch (NoPlayerException e)
{
Fatal( " Error: " + e);
}
}
catch (MalformedURLException e)
{
Fatal( " Error: " + e);
}
catch (IOException e)
{
Fatal( " Error: " + e);
}
if (player != null )
{
this .filename = filename; // 保存文件名称
JMFrame jmframe = new JMFrame(player, filename); // 新建立一个播放窗口
desktop.add(jmframe);
}
}
}
class JMFrame extends JInternalFrame implements ControllerListener
{ // 播放器
Player mplayer;
Component visual = null ;
Component control = null ;
int videoWidth = 0 ;
int videoHeight = 0 ;
int controlHeight = 30 ;
int insetWidth = 10 ;
int insetHeight = 30 ;
boolean firstTime = true ;
public JMFrame(Player player, String title)
{
super(title, true , true , true , true );
getContentPane().setLayout( new BorderLayout() );
setSize( 320 , 10 );
setLocation( 50 , 50 );
setVisible( true );
mplayer = player;
mplayer.addControllerListener((ControllerListener) this );
mplayer.realize();
addInternalFrameListener( new InternalFrameAdapter()
{
public void internalFrameClosing(InternalFrameEvent ife)
{
mplayer.close();
}
}
);
}
public void controllerUpdate(ControllerEvent ce)
{
if (ce instanceof RealizeCompleteEvent)
{
mplayer.prefetch();
}
else if (ce instanceof PrefetchCompleteEvent)
{
if (visual != null )
return ;
if ((visual = mplayer.getVisualComponent()) != null )
{
Dimension size = visual.getPreferredSize();
videoWidth = size.width;
videoHeight = size.height;
getContentPane().add( " Center " , visual);
}
else
videoWidth = 320 ;
if ((control = mplayer.getControlPanelComponent()) != null )
{
controlHeight = control.getPreferredSize().height;
getContentPane().add( " South " , control);
}
setSize(videoWidth + insetWidth,videoHeight + controlHeight + insetHeight);
validate();
mplayer.start();
}
else if (ce instanceof EndOfMediaEvent)
{
mplayer.setMediaTime( new Time( 0 ));
mplayer.start();
}
}
}
问题：如何结合Swing组件使用JMF。Swing组件是轻量级组件，而JMF默认使用的是重量级组件（它们可以为高速率的视频使用本地的绘制方法）。
解决方案：
JMF2.0包含了几个不同的视频绘制器，可以强制让播放器使用轻量级组件。示例如下：
Manager.setHint(Manager.LIGHTWEIGHT_RENDERER, new Boolean(true));
这在内部是通过PlugInManager来使其只能使用轻量级绘制器，此后创建的任何播放器都将使用轻量级绘制器。注意的是存在父容器中的组件的双缓存功能应该要开启。