/*
 * Copyright (C) 2009 The Sipdroid Open Source Project
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * 
 * This file is part of Sipdroid (http://www.sipdroid.org)
 * 
 * Sipdroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.sipdroid.net;

import java.net.InetAddress;
import java.net.DatagramPacket;
import java.io.IOException;



/**
 * RtpSocket implements a RTP socket for receiving and sending RTP packets.
 * <p>
 * RtpSocket is associated to a DatagramSocket that is used to send and/or
 * receive RtpPackets.
 */
public class RtpSocket {
    /** UDP socket */
    SipdroidSocket socket;
    DatagramPacket datagram;

    /** Remote address */
    InetAddress r_addr;

    /** Remote port */
    int r_port;

    /** Creates a new RTP socket (only receiver) */
    public RtpSocket(SipdroidSocket datagram_socket) {
	socket = datagram_socket;
	r_addr = null;
	r_port = 0;
	datagram = new DatagramPacket(new byte[1],1);
    }

    /** Creates a new RTP socket (sender and receiver) */
    public RtpSocket(SipdroidSocket datagram_socket,
	InetAddress remote_address, int remote_port) {
	socket = datagram_socket;
	r_addr = remote_address;
	r_port = remote_port;
	datagram = new DatagramPacket(new byte[1],1);
    }

    /** Returns the RTP SipdroidSocket */
    public SipdroidSocket getDatagramSocket() {
	return socket;
    }

    /** Receives a RTP packet from this socket */
    public void receive(RtpPacket rtpp) throws IOException {
	datagram.setData(rtpp.packet);
	datagram.setLength(rtpp.packet.length);
	socket.receive(datagram);
	if (!socket.isConnected())
	    socket.connect(datagram.getAddress(),datagram.getPort());
	rtpp.packet_len = datagram.getLength();
    }

    /** Sends a RTP packet from this socket */
    public void send(RtpPacket rtpp) throws IOException {
	datagram.setData(rtpp.packet);
	datagram.setLength(rtpp.packet_len);
	datagram.setAddress(r_addr);
	datagram.setPort(r_port);
	socket.send(datagram);
    }

    /** Closes this socket */
    public void close() { // socket.close();
    }

}