SimplePlayerApplet.java Source Code (original) (raw)

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import java.applet.Applet; import java.awt.; import java.awt.event.; import java.lang.String; import java.net.URL; import java.net.MalformedURLException; import java.io.IOException; import java.util.Properties; import javax.media.*; //import com.sun.media.util.JMFSecurity;

/**

• This is a Java Applet that demonstrates how to create a simple

• media player with a media event listener. It will play the

• media clip right away and continuously loop.

• *<!-- Sample HTML

• --> */ public class SimplePlayerApplet extends Applet implements ControllerListener {

  // media Player Player player = null; // component in which video is playing Component visualComponent = null; // controls gain, position, start, stop Component controlComponent = null; // displays progress during download Component progressBar = null; boolean firstTime = true; long CachingSize = 0L;
  Panel panel = null; int controlPanelHeight = 0; int videoWidth = 0; int videoHeight = 0;

  /**

  • Read the applet file parameter and create the media

  • player. */ public void init() { //$ System.out.println("Applet.init() is called"); setLayout(null); setBackground(Color.white); panel = new Panel(); panel.setLayout( null ); add(panel); panel.setBounds(0, 0, 320, 240);

    // input file name from html param String mediaFile = null; // URL for our media file MediaLocator mrl = null; URL url = null;

    // Get the media filename info. // The applet tag should contain the path to the // source media file, relative to the html page.

    if ((mediaFile = getParameter("FILE")) == null) Fatal("Invalid media file parameter"); try { url = new URL(getDocumentBase(), mediaFile); mediaFile = url.toExternalForm(); } catch (MalformedURLException mue) { }

    try { // Create a media locator from the file name if ((mrl = new MediaLocator(mediaFile)) == null) Fatal("Can't build URL for " + mediaFile); /* try { JMFSecurity.enablePrivilege.invoke(JMFSecurity.privilegeManager, JMFSecurity.writePropArgs); JMFSecurity.enablePrivilege.invoke(JMFSecurity.privilegeManager, JMFSecurity.readPropArgs); JMFSecurity.enablePrivilege.invoke(JMFSecurity.privilegeManager, JMFSecurity.connectArgs); } catch (Exception e) {} */ // Create an instance of a player for this media try { player = Manager.createPlayer(mrl); } catch (NoPlayerException e) { System.out.println(e); Fatal("Could not create player for " + mrl); } // Add ourselves as a listener for a player's events player.addControllerListener(this); } catch (MalformedURLException e) { Fatal("Invalid media file URL!"); } catch (IOException e) { Fatal("IO exception creating player for " + mrl); }

    // This applet assumes that its start() calls // player.start(). This causes the player to become // realized. Once realized, the applet will get // the visual and control panel components and add // them to the Applet. These components are not added // during init() because they are long operations that // would make us appear unresposive to the user.

  }

  /**

  • Start media file playback. This function is called the
  • first time that the Applet runs and every
  • time the user re-enters the page. */

  public void start() { //$ System.out.println("Applet.start() is called"); // Call start() to prefetch and start the player. if (player != null) player.start(); }

  /**

  • Stop media file playback and release resource before
  • leaving the page. */ public void stop() { //$ System.out.println("Applet.stop() is called"); if (player != null) { player.stop(); player.deallocate(); } }

  public void destroy() { //$ System.out.println("Applet.destroy() is called"); player.close(); }

  /**

  • This controllerUpdate function must be defined in order to
  • implement a ControllerListener interface. This
  • function will be called whenever there is a media event */ public synchronized void controllerUpdate(ControllerEvent event) { // If we're getting messages from a dead player, // just leave if (player == null) return; // When the player is Realized, get the visual // and control components and add them to the Applet if (event instanceof RealizeCompleteEvent) { if (progressBar != null) { panel.remove(progressBar); progressBar = null; } int width = 320; int height = 0; if (controlComponent == null) if (( controlComponent = player.getControlPanelComponent()) != null) {
    controlPanelHeight = controlComponent.getPreferredSize().height; panel.add(controlComponent); height += controlPanelHeight; } if (visualComponent == null) if (( visualComponent = player.getVisualComponent())!= null) { panel.add(visualComponent); Dimension videoSize = visualComponent.getPreferredSize(); videoWidth = videoSize.width; videoHeight = videoSize.height; width = videoWidth; height += videoHeight; visualComponent.setBounds(0, 0, videoWidth, videoHeight); } panel.setBounds(0, 0, width, height); if (controlComponent != null) { controlComponent.setBounds(0, videoHeight, width, controlPanelHeight); controlComponent.invalidate(); } } else if (event instanceof CachingControlEvent) { if (player.getState() > Controller.Realizing) return; // Put a progress bar up when downloading starts, // take it down when downloading ends. CachingControlEvent e = (CachingControlEvent) event; CachingControl cc = e.getCachingControl(); // Add the bar if not already there ... if (progressBar == null) { if ((progressBar = cc.getControlComponent()) != null) { panel.add(progressBar); panel.setSize(progressBar.getPreferredSize()); validate(); } } } else if (event instanceof EndOfMediaEvent) { // We've reached the end of the media; rewind and // start over player.setMediaTime(new Time(0)); player.start(); } else if (event instanceof ControllerErrorEvent) { // Tell TypicalPlayerApplet.start() to call it a day player = null; Fatal(((ControllerErrorEvent)event).getMessage()); } else if (event instanceof ControllerClosedEvent) { panel.removeAll(); }

  }

  void Fatal (String s) { // Applications will make various choices about what // to do here. We print a message System.err.println("FATAL ERROR: " + s); throw new Error(s); // Invoke the uncaught exception // handler System.exit() is another // choice.

  }

}

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