Play the media object 3
/*
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.*;
import javax.media.control.*;
public class ControlQueryPApplet 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;
protected SystemTimeBase timer;
/***************************************************************************
* 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);
Manager.setHint(Manager.PLUGIN_PLAYER, new Boolean(true));
player = Manager.createPlayer(locator);
player.addControllerListener(this);
timer = new SystemTimeBase();
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) {
Control[] allControls = player.getControls();
System.out.println("" + allControls.length
+ " controls for a Player @ REALIZED:");
for (int i = 0; i < allControls.length; i++)
System.out.println("" + (i + 1) + ": " + allControls[i]);
add(player.getVisualComponent(), "North");
add(player.getControlPanelComponent(), "South");
validate();
} else if (e instanceof StartEvent) {
Control[] allControls = player.getControls();
System.out.println("" + allControls.length
+ " controls for a Player @ START:");
Panel panel = new Panel();
for (int i = 0; i < allControls.length; i++) {
System.out.println("" + (i + 1) + ": " + allControls[i]);
Component cont = allControls[i].getControlComponent();
if (cont != null) {
System.out.println("Has a graphical component");
panel.add(cont);
}
}
panel.validate();
add(panel, "Center");
validate();
FrameGrabbingControl frameControl = (FrameGrabbingControl) player
.getControl("javax.media.control.FrameGrabbingControl");
if (frameControl == null)
System.out.println("Unable to obtain FrameRateControl");
else {
System.out.println("Have Frame Rate control");
panel.add(frameControl.getControlComponent());
panel.validate();
}
}
}
}
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