A Bare Bones Player: play the media object : Media « 2D Graphics GUI « Java






A Bare Bones Player: play the media object

/*

Java Media APIs: Cross-Platform Imaging, Media and Visualization
Alejandro Terrazas
Sams, Published November 2002, 
ISBN 0672320940
*/
/*******************************************************************************
 * A "Bare Bones" Player Applet (BBP Applet) that will play the media object
 * indicated in the "media2Play" property of the Applet tag.
 * 
 * <p>
 * The applet demonstrates the relative ease with which the JMF can be employed,
 * particularly for playing. The applet a minimal player, placing the controls
 * for the player and the visual component for the played object within the
 * Applet. The object plays once, but can be controlled by the user through the
 * control panel provided.
 * 
 * <p>
 * The tag for the Applet should look something like:
 * 
 * <!-- Sample HTML <applet code="BBPApplet.class" width=300 height=400> <param
 * name="media2Play" value="myVideo.mpg"> </applet> -->
 * 
 * @author Spike Barlow
 ******************************************************************************/

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.media.*;

public class BBPApplet extends Applet implements ControllerListener {

  /***************************************************************************
   * Object to play the media. Only attribute that the Applet really needs.
   **************************************************************************/
  protected Player player;

  /***************************************************************************
   * The name of the media to be played.
   **************************************************************************/
  protected String nameOfMedia2Play;

  /***************************************************************************
   * Name of the Property field within the applet tage indicating the name of
   * the media to play.
   **************************************************************************/
  private static final String MEDIA_NAME_PROPERTY = "media2Play";

  /***************************************************************************
   * Object describing the location of the media to be played.
   **************************************************************************/
  protected MediaLocator locator;

  /***************************************************************************
   * Initialise the applet by attempting to create and start a Player object
   * capable of playing the media specified in the applet tag.
   **************************************************************************/
  public void init() {

    setLayout(new BorderLayout());
    setBackground(Color.lightGray);
    try {
      nameOfMedia2Play = (new URL(getDocumentBase(),
          getParameter(MEDIA_NAME_PROPERTY))).toExternalForm();
      locator = new MediaLocator(nameOfMedia2Play);
      player = Manager.createPlayer(locator);
      player.addControllerListener(this);
      player.start();
    } catch (Exception e) {
      throw new Error("Couldn't initialise BBPApplet: " + e.getMessage());
    }
  }

  /***************************************************************************
   * Respond to ControllerEvents from the Player that was created. For the
   * bare bones player the only event of import is the RealizeCompleteEvent.
   * At that stage the visual component and controller for the Player can
   * finally be obtained and thus displayed.
   **************************************************************************/
  public synchronized void controllerUpdate(ControllerEvent e) {

    if (e instanceof RealizeCompleteEvent) {
      add(player.getVisualComponent(), "North");
      add(player.getControlPanelComponent(), "South");
      validate();
    }
  }
}

           
       








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