/**
* $RCSfile: ScreenShareSession.java,v $
* $Revision: 1.2 $
* $Date: 08/11/2006
* <p/>
* Copyright 2003-2006 Jive Software.
* <p/>
* All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* <p/>
* http://www.apache.org/licenses/LICENSE-2.0
* <p/>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smackx.jingle.mediaimpl.sshare;
import java.awt.Rectangle;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.IOException;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.UnknownHostException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jivesoftware.smackx.jingle.JingleSession;
import org.jivesoftware.smackx.jingle.SmackLogger;
import org.jivesoftware.smackx.jingle.media.JingleMediaSession;
import org.jivesoftware.smackx.jingle.media.PayloadType;
import org.jivesoftware.smackx.jingle.mediaimpl.sshare.api.ImageDecoder;
import org.jivesoftware.smackx.jingle.mediaimpl.sshare.api.ImageEncoder;
import org.jivesoftware.smackx.jingle.mediaimpl.sshare.api.ImageReceiver;
import org.jivesoftware.smackx.jingle.mediaimpl.sshare.api.ImageTransmitter;
import org.jivesoftware.smackx.jingle.nat.TransportCandidate;
/**
* This Class implements a complete JingleMediaSession.
* It sould be used to transmit and receive captured images from the Display.
* This Class should be automaticly controlled by JingleSession.
* For better NAT Traversal support this implementation don't support only receive or only transmit.
* To receive you MUST transmit. So the only implemented and functionally methods are startTransmit() and stopTransmit()
*
* @author Thiago Camargo
*/
public class ScreenShareSession extends JingleMediaSession {
private static final SmackLogger LOGGER = SmackLogger.getLogger(ScreenShareSession.class);
private ImageTransmitter transmitter = null;
private ImageReceiver receiver = null;
private int width = 600;
private int height = 600;
/**
* Creates a org.jivesoftware.jingleaudio.jmf.AudioMediaSession with defined payload type, remote and local candidates
*
* @param payloadType Payload of the jmf
* @param remote the remote information. The candidate that the jmf will be sent to.
* @param local the local information. The candidate that will receive the jmf
* @param locator media locator
*/
public ScreenShareSession(final PayloadType payloadType, final TransportCandidate remote, final TransportCandidate local,
final String locator, JingleSession jingleSession) {
super(payloadType, remote, local, "Screen", jingleSession);
initialize();
}
/**
* Initialize the screen share channels.
*/
public void initialize() {
JingleSession session = getJingleSession();
if ((session != null) && (session.getInitiator().equals(session.getConnection().getUser()))) {
// If the initiator of the jingle session is us then we transmit a screen share.
try {
InetAddress remote = InetAddress.getByName(getRemote().getIp());
transmitter = new ImageTransmitter(new DatagramSocket(getLocal().getPort()), remote, getRemote().getPort(),
new Rectangle(0, 0, width, height));
} catch (Exception e) {
e.printStackTrace();
}
} else {
// Otherwise we receive a screen share.
JFrame window = new JFrame();
JPanel jp = new JPanel();
window.add(jp);
window.setLocation(0, 0);
window.setSize(600, 600);
window.addWindowListener(new WindowAdapter() {
public void windowClosed(WindowEvent e) {
receiver.stop();
}
});
try {
receiver = new ImageReceiver(InetAddress.getByName("0.0.0.0"), getRemote().getPort(), getLocal().getPort(), width,
height);
LOGGER.debug("Receiving on:" + receiver.getLocalPort());
} catch (UnknownHostException e) {
e.printStackTrace();
}
jp.add(receiver);
receiver.setVisible(true);
window.setAlwaysOnTop(true);
window.setVisible(true);
}
}
/**
* Starts transmission and for NAT Traversal reasons start receiving also.
*/
public void startTrasmit() {
new Thread(transmitter).start();
}
/**
* Set transmit activity. If the active is true, the instance should trasmit.
* If it is set to false, the instance should pause transmit.
*
* @param active active state
*/
public void setTrasmit(boolean active) {
transmitter.setTransmit(true);
}
/**
* For NAT Reasons this method does nothing. Use startTransmit() to start transmit and receive jmf
*/
public void startReceive() {
// Do nothing
}
/**
* Stops transmission and for NAT Traversal reasons stop receiving also.
*/
public void stopTrasmit() {
if (transmitter != null) {
transmitter.stop();
}
}
/**
* For NAT Reasons this method does nothing. Use startTransmit() to start transmit and receive jmf
*/
public void stopReceive() {
if (receiver != null) {
receiver.stop();
}
}
/**
* Obtain a free port we can use.
*
* @return A free port number.
*/
protected int getFreePort() {
ServerSocket ss;
int freePort = 0;
for (int i = 0; i < 10; i++) {
freePort = (int) (10000 + Math.round(Math.random() * 10000));
freePort = freePort % 2 == 0 ? freePort : freePort + 1;
try {
ss = new ServerSocket(freePort);
freePort = ss.getLocalPort();
ss.close();
return freePort;
} catch (IOException e) {
e.printStackTrace();
}
}
try {
ss = new ServerSocket(0);
freePort = ss.getLocalPort();
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
return freePort;
}
public void setEncoder(ImageEncoder encoder) {
if (encoder != null) {
this.transmitter.setEncoder(encoder);
}
}
public void setDecoder(ImageDecoder decoder) {
if (decoder != null) {
this.receiver.setDecoder(decoder);
}
}
}