Sample program to demonstrate FramePositioningControl.
/*
* @(#)Seek.java 1.2 01/03/13
*
* Copyright (c) 1999-2001 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
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* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
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import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Component;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import javax.media.ConfigureCompleteEvent;
import javax.media.ControllerEvent;
import javax.media.ControllerListener;
import javax.media.Duration;
import javax.media.EndOfMediaEvent;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.PrefetchCompleteEvent;
import javax.media.RealizeCompleteEvent;
import javax.media.ResourceUnavailableEvent;
import javax.media.SizeChangeEvent;
import javax.media.Time;
import javax.media.control.FramePositioningControl;
import javax.media.protocol.DataSource;
/**
* Sample program to demonstrate FramePositioningControl.
*/
public class Seek extends Frame implements ControllerListener, ActionListener {
Player p;
FramePositioningControl fpc;
Object waitSync = new Object();
boolean stateTransitionOK = true;
int totalFrames = FramePositioningControl.FRAME_UNKNOWN;
Panel cntlPanel;
Button fwdButton;
Button bwdButton;
Button rndButton;
/**
* Given a DataSource, create a player and use that player
* as a player to playback the media.
*/
public boolean open(DataSource ds) {
System.err.println("create player for: " + ds.getContentType());
try {
p = Manager.createPlayer(ds);
} catch (Exception e) {
System.err.println("Failed to create a player from the given DataSource: " + e);
return false;
}
p.addControllerListener(this);
p.realize();
if (!waitForState(p.Realized)) {
System.err.println("Failed to realize the player.");
return false;
}
// Try to retrieve a FramePositioningControl from the player.
fpc = (FramePositioningControl)p.getControl("javax.media.control.FramePositioningControl");
if (fpc == null) {
System.err.println("The player does not support FramePositioningControl.");
System.err.println("There's no reason to go on for the purpose of this demo.");
return false;
}
Time duration = p.getDuration();
if (duration != Duration.DURATION_UNKNOWN) {
System.err.println("Movie duration: " + duration.getSeconds());
totalFrames = fpc.mapTimeToFrame(duration);
if (totalFrames != FramePositioningControl.FRAME_UNKNOWN)
System.err.println("Total # of video frames in the movies: " + totalFrames);
else
System.err.println("The FramePositiongControl does not support mapTimeToFrame.");
} else {
System.err.println("Movie duration: unknown");
}
// Prefetch the player.
p.prefetch();
if (!waitForState(p.Prefetched)) {
System.err.println("Failed to prefetch the player.");
return false;
}
// Display the visual & control component if there's one.
setLayout(new BorderLayout());
cntlPanel = new Panel();
fwdButton = new Button("Forward");
bwdButton = new Button("Backward");
rndButton = new Button("Random");
fwdButton.addActionListener(this);
bwdButton.addActionListener(this);
rndButton.addActionListener(this);
cntlPanel.add(fwdButton);
cntlPanel.add(bwdButton);
cntlPanel.add(rndButton);
Component vc;
if ((vc = p.getVisualComponent()) != null) {
add("Center", vc);
}
add("South", cntlPanel);
setVisible(true);
return true;
}
public void addNotify() {
super.addNotify();
pack();
}
/**
* Block until the player has transitioned to the given state.
* Return false if the transition failed.
*/
boolean waitForState(int state) {
synchronized (waitSync) {
try {
while (p.getState() < state && stateTransitionOK)
waitSync.wait();
} catch (Exception e) {}
}
return stateTransitionOK;
}
public void actionPerformed(ActionEvent ae) {
String command = ae.getActionCommand();
if (command.equals("Forward")) {
int dest = fpc.skip(1);
System.err.println("Step forward " + dest + " frame.");
} else if (command.equals("Backward")) {
int dest = fpc.skip(-1);
System.err.println("Step backward " + dest + " frame.");
} else if (command.equals("Random")) {
if (totalFrames == FramePositioningControl.FRAME_UNKNOWN)
System.err.println("Cannot jump to a random frame.");
else {
int randomFrame = (int)(totalFrames * Math.random());
randomFrame = fpc.seek(randomFrame);
System.err.println("Jump to a random frame: " + randomFrame);
}
}
int currentFrame = fpc.mapTimeToFrame(p.getMediaTime());
if (currentFrame != FramePositioningControl.FRAME_UNKNOWN)
System.err.println("Current frame: " + currentFrame);
}
/**
* Controller Listener.
*/
public void controllerUpdate(ControllerEvent evt) {
if (evt instanceof ConfigureCompleteEvent ||
evt instanceof RealizeCompleteEvent ||
evt instanceof PrefetchCompleteEvent) {
synchronized (waitSync) {
stateTransitionOK = true;
waitSync.notifyAll();
}
} else if (evt instanceof ResourceUnavailableEvent) {
synchronized (waitSync) {
stateTransitionOK = false;
waitSync.notifyAll();
}
} else if (evt instanceof EndOfMediaEvent) {
p.setMediaTime(new Time(0));
//p.start();
//p.close();
//System.exit(0);
} else if (evt instanceof SizeChangeEvent) {
}
}
/**
* Main program
*/
public static void main(String [] args) {
if (args.length == 0) {
prUsage();
System.exit(0);
}
MediaLocator ml;
if ((ml = new MediaLocator(args[0])) == null) {
System.err.println("Cannot build media locator from: " + args[0]);
prUsage();
System.exit(0);
}
DataSource ds = null;
// Create a DataSource given the media locator.
try {
ds = Manager.createDataSource(ml);
} catch (Exception e) {
System.err.println("Cannot create DataSource from: " + ml);
System.exit(0);
}
Seek seek = new Seek();
if (!seek.open(ds))
System.exit(0);
}
static void prUsage() {
System.err.println("Usage: java Seek <url>");
}
}
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