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Smack/jingle/media/source/org/jivesoftware/jingleaudio/jmf/AudioMediaSession.java
2007-01-04 17:25:30 +00:00

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package org.jivesoftware.jingleaudio.jmf; /**
* $RCSfile$
* $Revision: $
* $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.
*/
import org.jivesoftware.jingleaudio.jmf.AudioChannel;
import org.jivesoftware.jingleaudio.jmf.AudioFormatUtils;
import org.jivesoftware.smackx.jingle.media.JingleMediaSession;
import org.jivesoftware.smackx.jingle.media.PayloadType;
import org.jivesoftware.smackx.jingle.nat.TransportCandidate;
import javax.media.MediaLocator;
import javax.media.format.AudioFormat;
import java.io.IOException;
import java.net.ServerSocket;
/**
* This Class implements a complete JingleMediaSession.
* It sould be used to transmit and receive audio captured from the Mic.
* This Class should be automaticly controlled by JingleSession.
* But you could also use in any VOIP application.
* 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()
*/
public class AudioMediaSession extends JingleMediaSession {
private AudioFormat format;
private AudioChannel audioChannel;
/**
* 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
*/
public AudioMediaSession(final PayloadType payloadType, final TransportCandidate remote,
final TransportCandidate local) {
super(payloadType, remote, local);
}
/**
* Initialize the Audio Channel to make it able to send and receive audio
*/
public void initialize() {
String ip;
String localIp;
int localPort;
int remotePort;
if (this.getLocal().getSymmetric() != null) {
ip = this.getLocal().getIp();
localIp = this.getLocal().getLocalIp();
localPort = getFreePort();
remotePort = this.getLocal().getSymmetric().getPort();
System.out.println(this.getLocal().getConnection() + " " + ip + ": " + localPort + "->" + remotePort);
} else {
ip = this.getRemote().getIp();
localIp = this.getLocal().getLocalIp();
localPort = this.getLocal().getPort();
remotePort = this.getRemote().getPort();
}
audioChannel = new AudioChannel(new MediaLocator("dsound://"), localIp, ip, localPort, remotePort, AudioFormatUtils.getAudioFormat(this.getPayloadType()));
}
/**
* Starts transmission and for NAT Traversal reasons start receiving also.
*/
public void startTrasmit() {
audioChannel.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
*/
public void setTrasmit(boolean active) {
audioChannel.setTrasmit(active);
}
/**
* 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() {
audioChannel.stop();
}
/**
* For NAT Reasons this method does nothing. Use startTransmit() to start transmit and receive jmf
*/
public void stopReceive() {
// Do nothing
}
/**
* 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;
}
}