/*
* Copyright 2007 Sun Microsystems, Inc.
*
* This file is part of jVoiceBridge.
*
* jVoiceBridge is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation and distributed hereunder
* to you.
*
* jVoiceBridge 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* Sun designates this particular file as subject to the "Classpath"
* exception as provided by Sun in the License file that accompanied this
* code.
*/
package com.sun.voip;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
public class RtcpPacket {
public static final int SENDER_INTERVAL = 30; // 30 seconds
private static final int SENDER_REPORT_LENGTH = 52;
private static final int RECEIVER_REPORT_LENGTH = 32;
private DatagramPacket packet;
protected byte[] rtcpData;
protected SocketAddress from;
/*
* This constructor is used for a packet which has been received.
*/
public RtcpPacket(DatagramPacket packet) {
rtcpData = packet.getData();
from = packet.getSocketAddress();
}
/*
* This constructor is used to create a packet to send
*/
public RtcpPacket(int SSRC, boolean isSenderReport) {
if (isSenderReport) {
rtcpData = new byte[SENDER_REPORT_LENGTH];
rtcpData[0] = (byte) 0x81;
rtcpData[1] = (byte) 200;
rtcpData[2] = (byte) 0;
rtcpData[3] = (byte) SENDER_REPORT_LENGTH;
} else {
rtcpData = new byte[RECEIVER_REPORT_LENGTH];
rtcpData[0] = (byte) 0x81;
rtcpData[1] = (byte) 201;
rtcpData[2] = (byte) 0;
rtcpData[3] = (byte) RECEIVER_REPORT_LENGTH;
}
rtcpData[4] = (byte) ((SSRC >> 24) & 0xff);
rtcpData[5] = (byte) ((SSRC >> 16) & 0xff);
rtcpData[6] = (byte) ((SSRC >> 8) & 0xff);
rtcpData[7] = (byte) (SSRC & 0xff);
packet = new DatagramPacket(rtcpData, rtcpData.length);
}
public byte[] getData() {
return rtcpData;
}
public int getSynchronizationSource() {
return ((rtcpData[4] << 24) & 0xff000000) |
((rtcpData[5] << 16) & 0x00ff0000) |
((rtcpData[6] << 8) & 0x0000ff00) |
(rtcpData[7] & 0xff);
}
public void setSynchronizationSource(int synchronizationSource) {
rtcpData[4] = (byte) ((synchronizationSource >> 24) & 0xff);
rtcpData[5] = (byte) ((synchronizationSource >> 16) & 0xff);
rtcpData[6] = (byte) ((synchronizationSource >> 8) & 0xff);
rtcpData[7] = (byte) (synchronizationSource & 0xff);
}
public DatagramPacket getDatagramPacket() {
return packet;
}
/**
* Set the SocketAddress of where to send this packet.
*/
public void setSocketAddress(InetSocketAddress isa) {
packet.setSocketAddress(isa);
}
public SocketAddress getSocketAddress() {
return packet.getSocketAddress();
}
}