RTP/src/model/RTPSendSingleString.java

/**
 * Java RTP Library (jlibrtp)
 * Copyright (C) 2006 Arne Kepp
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package model;

import java.net.DatagramSocket;
import jlibrtp.*;

/**
 * <p>
 * This is an example of how to set up a Unicast session.</p>
 * <p>
 * It does not accept any input arguments and is therefore of limited practical
 * value, but it shows the basics.</p>
 *
 * <p>
 * The class has to implement RTPAppIntf.</p>
 *
 * @author Arne Kepp
 */
public class RTPSendSingleString implements RTPAppIntf {

    /**
     * Holds a RTPSession instance
     */
    RTPSession rtpSession = null;

    public RTPSendSingleString() {
    }

    /**
     * A minimal constructor
     */
    public RTPSendSingleString(RTPSession rtpSession) {
        this.rtpSession = rtpSession;
    }

    // RTPAppIntf  All of the following are documented in the JavaDocs
    /**
     * Used to receive data from the RTP Library. We expect no data
     */
    public void receiveData(DataFrame frame, Participant p) {
        /**
         * This concatenates all received packets for a single timestamp into a
         * single byte[]
         */
        byte[] data = frame.getConcatenatedData();

        /**
         * This returns the CNAME, if any, associated with the SSRC that was
         * provided in the RTP packets received.
         */
        String cname = p.getCNAME();

        System.out.println("Received data from " + cname);
        System.out.println(new String(data));
    }

    /**
     * Used to communicate updates to the user database through RTCP
     */
    public void userEvent(int type, Participant[] participant) {
        //Do nothing
    }

    /**
     * How many packets make up a complete frame for the payload type?
     */
    public int frameSize(int payloadType) {
        return 1;
    }
    // RTPAppIntf/

    public static void main(String[] args) {
        // 1. Create sockets for the RTPSession
        DatagramSocket rtpSocket = null;
        DatagramSocket rtcpSocket = null;
        try {
            rtpSocket = new DatagramSocket(5004);
            rtcpSocket = new DatagramSocket(5005);
        } catch (Exception e) {
            System.out.println(e);
            System.out.println("RTPSession failed to obtain port");
        }

        // 2. Create the RTP session
        RTPSession rtpSession = new RTPSession(rtpSocket, rtcpSocket);

        // 3. Instantiate the application object
        RTPSendSingleString uex = new RTPSendSingleString(rtpSession);

        // 4. Add participants we want to notify upon registration
        // a. Hopefully nobody is listening on this port.
        Participant part = new Participant("192.168.100.11", 5004, 5005);
        rtpSession.addParticipant(part);

        // 5. Register the callback interface, this launches RTCP threads too
        // The two null parameters are for the RTCP and debug interfaces, not use here
        rtpSession.RTPSessionRegister(uex, null, null);

        // Wait 2500 ms, because of the initial RTCP wait
        try {
            Thread.sleep(2000);
        } catch (Exception e) {
            System.out.println(e);
        }

        // Note: The wait is optional, but insures SDES packets
        //       receive participants before continuing
        // 6. Send some data
        String str = "Hi there!";
        rtpSession.sendData(str.getBytes());

        // 7. Terminate the session, takes a few ms to kill threads in order.
        rtpSession.endSession();
        //This may result in "Sleep interrupted" messages, ignore them
    }
}