--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jlibrtp/RTPReceiverThread.java	Sat Mar 14 22:15:41 2009 +0100
@@ -0,0 +1,169 @@
+/**
+ * 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 jlibrtp;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.InetSocketAddress;
+
+/**
+ * The RTP receiver thread waits on the designated UDP socket for new packets.
+ * 
+ * Once one arrives, it is parsed and tested. We also check the ip-address of the sender. 
+ * If accepted, the packet is added onto the packet buffer of the participant.
+ * 
+ * A separate thread moves the packet from the packet buffer to the application.
+ * 
+ * @author Arne Kepp
+ */
+public class RTPReceiverThread extends Thread {
+	/** Parent RTP Session */
+	RTPSession rtpSession = null;
+
+	RTPReceiverThread(RTPSession session) {
+		rtpSession = session;
+		if(RTPSession.rtpDebugLevel > 1) {
+			System.out.println("<-> RTPReceiverThread created");
+		} 
+	}
+
+	public void run() {
+		if(RTPSession.rtpDebugLevel > 1) {
+			if(rtpSession.mcSession) {
+				System.out.println("-> RTPReceiverThread.run() starting on MC " + rtpSession.rtpMCSock.getLocalPort() );
+			} else {
+				System.out.println("-> RTPReceiverThread.run() starting on " + rtpSession.rtpSock.getLocalPort() );
+			}
+		}
+
+		while(!rtpSession.endSession) {
+			if(RTPSession.rtpDebugLevel > 6) {
+				if(rtpSession.mcSession) {
+					System.out.println("-> RTPReceiverThread.run() waiting for MC packet on " + rtpSession.rtpMCSock.getLocalPort() );
+				} else {
+					System.out.println("-> RTPReceiverThread.run() waiting for packet on " + rtpSession.rtpSock.getLocalPort() );
+				}
+			}
+
+			// Prepare a packet
+			byte[] rawPkt = new byte[1500];
+			DatagramPacket packet = new DatagramPacket(rawPkt, rawPkt.length);
+			// Wait for it to arrive
+			if(! rtpSession.mcSession) {
+				//Unicast
+				try {
+					rtpSession.rtpSock.receive(packet);
+				} catch (IOException e) {
+					if(!rtpSession.endSession) {
+						e.printStackTrace();
+					} else {
+						continue;
+					}
+				}
+			} else {
+				//Multicast 
+				try {
+					rtpSession.rtpMCSock.receive(packet);
+				} catch (IOException e) {
+					if(!rtpSession.endSession) {
+						e.printStackTrace();
+					} else {
+						continue;
+					}
+				}
+			}
+
+			// Parse the received RTP (?) packet
+			RtpPkt pkt = new RtpPkt(rawPkt, packet.getLength());
+
+			// Check whether it was valid.
+			if(pkt == null) {
+				System.out.println("Received invalid RTP packet. Ignoring");
+				continue;
+			}
+			
+			long pktSsrc = pkt.getSsrc();
+			
+			// Check for loops and SSRC collisions
+			if( rtpSession.ssrc == pktSsrc )
+				rtpSession.resolveSsrcConflict();
+			
+			long[] csrcArray = pkt.getCsrcArray();
+			if( csrcArray != null) {
+				for(int i=0; i< csrcArray.length; i++) {
+					if(csrcArray[i] == rtpSession.ssrc);
+						rtpSession.resolveSsrcConflict();
+				}
+			}
+			
+			if(RTPSession.rtpDebugLevel > 17) {
+				System.out.println("-> RTPReceiverThread.run() rcvd packet, seqNum " + pktSsrc );
+				if(RTPSession.rtpDebugLevel > 10) {
+					String str = new String(pkt.getPayload());
+					System.out.println("-> RTPReceiverThread.run() payload is " + str );
+				}
+			}
+			
+			//Find the participant in the database based on SSRC
+			Participant part = rtpSession.partDb.getParticipant(pktSsrc);
+
+			if(part == null) {
+				InetSocketAddress nullSocket = null;
+				part = new Participant((InetSocketAddress) packet.getSocketAddress(), nullSocket, pkt.getSsrc());
+				part.unexpected = true;
+				rtpSession.partDb.addParticipant(1,part);
+			}
+
+			// Do checks on whether the datagram came from the expected source for that SSRC.
+			if(part.rtpAddress == null || packet.getAddress().equals(part.rtpAddress.getAddress())) {
+				PktBuffer pktBuffer = part.pktBuffer;
+
+				if(pktBuffer != null) {
+					//A buffer already exists, append to it
+					pktBuffer.addPkt(pkt);
+				} else {
+					// Create a new packet/frame buffer
+					pktBuffer = new PktBuffer(this.rtpSession, part,pkt);
+					part.pktBuffer = pktBuffer;
+				}
+			} else {
+				System.out.println("RTPReceiverThread: Got an unexpected packet from " + pkt.getSsrc() 
+						+ " the sending ip-address was " + packet.getAddress().toString() 
+						+ ", we expected from " + part.rtpAddress.toString());
+			}
+
+			// Statistics for receiver report.
+			part.updateRRStats(packet.getLength(), pkt);
+			// Upate liveness
+			part.lastRtpPkt = System.currentTimeMillis();
+
+			if(RTPSession.rtpDebugLevel > 5) {
+				System.out.println("<-> RTPReceiverThread signalling pktBufDataReady");
+			}
+			
+			// Signal the thread that pushes data to application
+			rtpSession.pktBufLock.lock();
+			try { rtpSession.pktBufDataReady.signalAll(); } finally {
+				rtpSession.pktBufLock.unlock();
+			}
+
+		}
+	}
+
+}