Part 2: Write a media player using JMF Your MMF media player should have the fol

Question

Part 2: Write a media player using JMF

Your MMF media player should have the following components and functionalities:

It should play video files in MPEG, AVI and MOV formats, and audio files in MIDI format. Feel free to add other supported formats.

A menu bar with an Open option to open a media file, a Close option to close the currently opened file, and an Exit option to quit the application.

A control that consists of the following buttons:

Playbutton – plays the current video or audio file.

Stopbutton – stops the current video or audio file.

Pausebutton – stop playing the current video or audio file. When the play button is pressed, it continues to play the file from the paused position.

Position bar – display the current position of the media file.

Explanation / Answer

Answer:

Media player using JMF:

Code:

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);
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);
} catch (NoPlayerException e) {
Fatal("Error: " + e);
}
} catch (MalformedURLException e) {
Fatal("Error:" + e);
} catch (IOException e) {
Fatal("Error:" + e);
}
if (player != null) {
this.filename = filename;
JMFrame jmframe = new JMFrame(player, filename);
desktop.add(jmframe);
}
}
}

class JMFrame extends JInternalFrame implements ControllerListener {
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();
}
}
}

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