mediapanel.java

定要上载质量高而定要上载质量高而定要上载质量高而定要上载质量高而定要上载质量高而

/*
 * Created on Jun 27, 2005
 */
package org.flexdock.demos.raw.jmf;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextArea;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;

import javax.media.ControllerEvent;
import javax.media.ControllerListener;
import javax.media.EndOfMediaEvent;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.Time;

import org.flexdock.docking.DockingStub;
import org.flexdock.util.ResourceManager;


/**
 * @author Christopher Butler
 */
public class MediaPanel extends Panel implements DockingStub {
	private Player player;
	private Label titlebar;
	private String dockingId;
	
	public MediaPanel(String id, String title, String mediaFileName) {
        dockingId = id;
        setLayout(new BorderLayout());

        titlebar = new Label(title);
        titlebar.setBackground(new Color(183, 201, 217));
        add(titlebar, BorderLayout.NORTH);

        player = createPlayer(mediaFileName);
        if (player != null) {
            Component viewscreen = player.getVisualComponent();
            Component controls = player.getControlPanelComponent();

            if (viewscreen != null) {
                add(viewscreen, BorderLayout.CENTER);
            } else {
                TextArea ta = new TextArea("No JMF video playback support for '" + mediaFileName + "'");
                ta.setEditable(false);
                add(ta, BorderLayout.CENTER);
            }
            if (controls != null)
                add(controls, BorderLayout.SOUTH);
        } else {
            TextArea ta = new TextArea("No JMF decoder support for '" + mediaFileName + "'");
            ta.setEditable(false);
            add(ta, BorderLayout.CENTER);
        }
    }
	
	private static synchronized Player createPlayer(String mediaUri) {
	    try {
	        URL url = replaceJarUrlWithFileUrl(ResourceManager.getResource(mediaUri), mediaUri);
	        
	        MediaLocator locator = new MediaLocator(url);
	        final Player mediaPlayer = Manager.createRealizedPlayer(locator);
	        
	        // add a listener to put us in an infinite loop
	        mediaPlayer.addControllerListener(new ControllerListener() {
	            public void controllerUpdate(ControllerEvent evt) {
	                if(evt instanceof EndOfMediaEvent) {
	                    mediaPlayer.setMediaTime(new Time(0));
	                    mediaPlayer.start();
	                }
	            }
	        });
	        return mediaPlayer;
	    } catch (Exception e) {
	        e.printStackTrace();
	        return null;
	    }
	}
	
	private static HashMap jarUrlToTempFileCache = new HashMap();
	
	/**
	 * JMF doesn't realize a player/viewer for URLs pointing to resources inside jars.
	 * To workaround this problem, the jar resource will be written to a temp file 
	 * and the URL replaced with an url pointing to the temp file.
	 * I'd promote this into ResourceManager, but it appears to be isolated to JMF, so it'll stay here for now.
	 * 
	 * @param url url with jar in i
	 * @param mediaUri name of the original resource in t
	 * @return
	 * @throws IOException
	 */
	private static URL replaceJarUrlWithFileUrl(URL url, String mediaUri) throws IOException
	{
	    if(!url.getProtocol().equals("jar"))
	        return url;
	    
	    File f;
	    synchronized(jarUrlToTempFileCache) {
	        f = (File)jarUrlToTempFileCache.get(url);
	        if(f != null && f.exists() && f.isFile() && f.canRead())
	            return f.toURL();
	        
	        f = File.createTempFile("flexdock-", mediaUri);
	        f.deleteOnExit();
	        
	        FileOutputStream fos = new FileOutputStream(f);
	        BufferedOutputStream bos = new BufferedOutputStream(fos);
	        byte[] b = new byte[4096];
	        
	        URLConnection conn = url.openConnection();
	        InputStream is = conn.getInputStream();
	        int read;
	        while((read=is.read(b, 0, b.length)) != -1)
	            bos.write(b, 0, read);
	        
	        bos.close();
	        
	        jarUrlToTempFileCache.put(url, f);
	    }       
	    return f.toURL();
	}
    
	protected void finalize() {
		if(player!=null) {
			player.stop();
			player.close();
			player = null;
		}
	}
	
	public Component getDragSource() {
		return titlebar;
	}
	
	public Component getFrameDragSource() {
		return titlebar;
	}
	
	public String getPersistentId() {
		return dockingId;
	}
	
	public String getTabText() {
		return titlebar.getText();
	}
}