--- a/src/jlibrtp/RTPSession.java Thu May 28 14:26:06 2009 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1053 +0,0 @@
-/**
- * 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.net.DatagramSocket;
-import java.net.MulticastSocket;
-import java.net.DatagramPacket;
-import java.net.InetAddress;
-import java.net.InetSocketAddress;
-import java.util.Iterator;
-import java.util.concurrent.locks.*;
-import java.util.Random;
-import java.util.Enumeration;
-/**
- * The RTPSession object is the core of jlibrtp.
- *
- * One should be instantiated for every communication channel, i.e. if you send voice and video, you should create one for each.
- *
- * The instance holds a participant database, as well as other information about the session. When the application registers with the session, the necessary threads for receiving and processing RTP packets are spawned.
- *
- * RTP Packets are sent synchronously, all other operations are asynchronous.
- *
- * @author Arne Kepp
- */
-public class RTPSession {
- /**
- * The debug level is final to avoid compilation of if-statements.</br>
- * 0 provides no debugging information, 20 provides everything </br>
- * Debug output is written to System.out</br>
- * Debug level for RTP related things.
- */
- final static public int rtpDebugLevel = 0;
- /**
- * The debug level is final to avoid compilation of if-statements.</br>
- * 0 provides no debugging information, 20 provides everything </br>
- * Debug output is written to System.out</br>
- * Debug level for RTCP related things.
- */
- final static public int rtcpDebugLevel = 0;
-
- /** RTP unicast socket */
- protected DatagramSocket rtpSock = null;
- /** RTP multicast socket */
- protected MulticastSocket rtpMCSock = null;
- /** RTP multicast group */
- protected InetAddress mcGroup = null;
-
- // Internal state
- /** Whether this session is a multicast session or not */
- protected boolean mcSession = false;
- /** Current payload type, can be changed by application */
- protected int payloadType = 0;
- /** SSRC of this session */
- protected long ssrc;
- /** The last timestamp when we sent something */
- protected long lastTimestamp = 0;
- /** Current sequence number */
- protected int seqNum = 0;
- /** Number of packets sent by this session */
- protected int sentPktCount = 0;
- /** Number of octets sent by this session */
- protected int sentOctetCount = 0;
-
- /** The random seed */
- protected Random random = null;
-
- /** Session bandwidth in BYTES per second */
- protected int bandwidth = 8000;
-
- /** By default we do not return packets from strangers in unicast mode */
- protected boolean naiveReception = false;
-
- /** Should the library attempt frame reconstruction? */
- protected boolean frameReconstruction = true;
-
- /** Maximum number of packets used for reordering */
- protected int pktBufBehavior = 3;
-
- /** Participant database */
- protected ParticipantDatabase partDb = new ParticipantDatabase(this);
- /** Handle to application interface for RTP */
- protected RTPAppIntf appIntf = null;
- /** Handle to application interface for RTCP (optional) */
- protected RTCPAppIntf rtcpAppIntf = null;
- /** Handle to application interface for AVPF, RFC 4585 (optional) */
- protected RTCPAVPFIntf rtcpAVPFIntf = null;
- /** Handle to application interface for debugging */
- protected DebugAppIntf debugAppIntf = null;
-
- /** The RTCP session associated with this RTP Session */
- protected RTCPSession rtcpSession = null;
- /** The thread for receiving RTP packets */
- protected RTPReceiverThread recvThrd = null;
- /** The thread for invoking callbacks for RTP packets */
- protected AppCallerThread appCallerThrd = null;
-
- /** Lock to protect the packet buffers */
- final protected Lock pktBufLock = new ReentrantLock();
- /** Condition variable, to tell the */
- final protected Condition pktBufDataReady = pktBufLock.newCondition();
-
- /** Enough is enough, set to true when you want to quit. */
- protected boolean endSession = false;
- /** Only one registered application, please */
- protected boolean registered = false;
- /** We're busy resolving a SSRC conflict, please try again later */
- protected boolean conflict = false;
- /** Number of conflicts observed, exessive number suggests loop in network */
- protected int conflictCount = 0;
-
- /** SDES CNAME */
- protected String cname = null;
- /** SDES The participant's real name */
- public String name = null;
- /** SDES The participant's email */
- public String email = null;
- /** SDES The participant's phone number */
- public String phone = null;
- /** SDES The participant's location*/
- public String loc = null;
- /** SDES The tool the participants is using */
- public String tool = null;
- /** SDES A note */
- public String note = null;
- /** SDES A priv string, loosely defined */
- public String priv = null;
-
- // RFC 4585 stuff. This should live on RTCPSession, but we need to have this
- // infromation ready by the time the RTCP Session starts
- // 0 = RFC 3550 , -1 = ACK , 1 = Immediate feedback, 2 = Early RTCP,
- protected int rtcpMode = 0;
- protected int fbEarlyThreshold = -1; // group size, immediate -> early transition point
- protected int fbRegularThreshold = -1; // group size, early -> regular transition point
- protected int minInterval = 5000; // minimum interval
- protected int fbMaxDelay = 1000; // how long the information is useful
- // RTCP bandwidth
- protected int rtcpBandwidth = -1;
-
-
- /**
- * Returns an instance of a <b>unicast</b> RTP session.
- * Following this you should adjust any settings and then register your application.
- *
- * The sockets should have external ip addresses, else your CNAME automatically
- * generated CNAMe will be bad.
- *
- * @param rtpSocket UDP socket to receive RTP communication on
- * @param rtcpSocket UDP socket to receive RTCP communication on, null if none.
- */
- public RTPSession(DatagramSocket rtpSocket, DatagramSocket rtcpSocket) {
- mcSession = false;
- rtpSock = rtpSocket;
- this.generateCNAME();
- this.generateSsrc();
- this.rtcpSession = new RTCPSession(this,rtcpSocket);
-
- // The sockets are not always imediately available?
- try { Thread.sleep(1); } catch (InterruptedException e) { System.out.println("RTPSession sleep failed"); }
- }
-
- /**
- * Returns an instance of a <b>multicast</b> RTP session.
- * Following this you should register your application.
- *
- * The sockets should have external ip addresses, else your CNAME automatically
- * generated CNAMe will be bad.
- *
- * @param rtpSock a multicast socket to receive RTP communication on
- * @param rtcpSock a multicast socket to receive RTP communication on
- * @param multicastGroup the multicast group that we want to communicate with.
- */
- public RTPSession(MulticastSocket rtpSock, MulticastSocket rtcpSock, InetAddress multicastGroup) throws Exception {
- mcSession = true;
- rtpMCSock =rtpSock;
- mcGroup = multicastGroup;
- rtpMCSock.joinGroup(mcGroup);
- rtcpSock.joinGroup(mcGroup);
- this.generateCNAME();
- this.generateSsrc();
- this.rtcpSession = new RTCPSession(this,rtcpSock,mcGroup);
-
- // The sockets are not always imediately available?
- try { Thread.sleep(1); } catch (InterruptedException e) { System.out.println("RTPSession sleep failed"); }
- }
-
- /**
- * Registers an application (RTPAppIntf) with the RTP session.
- * The session will call receiveData() on the supplied instance whenever data has been received.
- *
- * Following this you should set the payload type and add participants to the session.
- *
- * @param rtpApp an object that implements the RTPAppIntf-interface
- * @param rtcpApp an object that implements the RTCPAppIntf-interface (optional)
- * @return -1 if this RTPSession-instance already has an application registered.
- */
- public int RTPSessionRegister(RTPAppIntf rtpApp, RTCPAppIntf rtcpApp, DebugAppIntf debugApp) {
- if(registered) {
- System.out.println("RTPSessionRegister(): Can\'t register another application!");
- return -1;
- } else {
- registered = true;
- generateSeqNum();
- if(RTPSession.rtpDebugLevel > 0) {
- System.out.println("-> RTPSessionRegister");
- }
- this.appIntf = rtpApp;
- this.rtcpAppIntf = rtcpApp;
- this.debugAppIntf = debugApp;
-
- recvThrd = new RTPReceiverThread(this);
- appCallerThrd = new AppCallerThread(this, rtpApp);
- recvThrd.start();
- appCallerThrd.start();
- rtcpSession.start();
- return 0;
- }
- }
-
- /**
- * Send data to all participants registered as receivers, using the current timeStamp,
- * dynamic sequence number and the current payload type specified for the session.
- *
- * @param buf A buffer of bytes, less than 1496 bytes
- * @return null if there was a problem, {RTP Timestamp, Sequence number} otherwise
- */
- public long[] sendData(byte[] buf) {
- byte[][] tmp = {buf};
- long[][] ret = this.sendData(tmp, null, null, -1, null);
-
- if(ret != null)
- return ret[0];
-
- return null;
- }
-
- /**
- * Send data to all participants registered as receivers, using the specified timeStamp,
- * sequence number and the current payload type specified for the session.
- *
- * @param buf A buffer of bytes, less than 1496 bytes
- * @param rtpTimestamp the RTP timestamp to be used in the packet
- * @param seqNum the sequence number to be used in the packet
- * @return null if there was a problem, {RTP Timestamp, Sequence number} otherwise
- */
- public long[] sendData(byte[] buf, long rtpTimestamp, long seqNum) {
- byte[][] tmp = {buf};
- long[][] ret = this.sendData(tmp, null, null, -1, null);
-
- if(ret != null)
- return ret[0];
-
- return null;
- }
-
- /**
- * Send data to all participants registered as receivers, using the current timeStamp and
- * payload type. The RTP timestamp will be the same for all the packets.
- *
- * @param buffers A buffer of bytes, should not bed padded and less than 1500 bytes on most networks.
- * @param csrcArray an array with the SSRCs of contributing sources
- * @param markers An array indicating what packets should be marked. Rarely anything but the first one
- * @param rtpTimestamp The RTP timestamp to be applied to all packets
- * @param seqNumbers An array with the sequence number associated with each byte[]
- * @return null if there was a problem sending the packets, 2-dim array with {RTP Timestamp, Sequence number}
- */
- public long[][] sendData(byte[][] buffers, long[] csrcArray, boolean[] markers, long rtpTimestamp, long[] seqNumbers) {
- if(RTPSession.rtpDebugLevel > 5) {
- System.out.println("-> RTPSession.sendData(byte[])");
- }
-
- // Same RTP timestamp for all
- if(rtpTimestamp < 0)
- rtpTimestamp = System.currentTimeMillis();
-
- // Return values
- long[][] ret = new long[buffers.length][2];
-
- for(int i=0; i<buffers.length; i++) {
- byte[] buf = buffers[i];
-
- boolean marker = false;
- if(markers != null)
- marker = markers[i];
-
- if(buf.length > 1500) {
- System.out.println("RTPSession.sendData() called with buffer exceeding 1500 bytes ("+buf.length+")");
- }
-
- // Get the return values
- ret[i][0] = rtpTimestamp;
- if(seqNumbers == null) {
- ret[i][1] = getNextSeqNum();
- } else {
- ret[i][1] = seqNumbers[i];
- }
- // Create a new RTP Packet
- RtpPkt pkt = new RtpPkt(rtpTimestamp,this.ssrc,(int) ret[i][1],this.payloadType,buf);
-
- if(csrcArray != null)
- pkt.setCsrcs(csrcArray);
-
- pkt.setMarked(marker);
-
- // Creates a raw packet
- byte[] pktBytes = pkt.encode();
-
- //System.out.println(Integer.toString(StaticProcs.bytesToUIntInt(pktBytes, 2)));
-
- // Pre-flight check, are resolving an SSRC conflict?
- if(this.conflict) {
- System.out.println("RTPSession.sendData() called while trying to resolve conflict.");
- return null;
- }
-
-
- if(this.mcSession) {
- DatagramPacket packet = null;
-
-
- try {
- packet = new DatagramPacket(pktBytes,pktBytes.length,this.mcGroup,this.rtpMCSock.getPort());
- } catch (Exception e) {
- System.out.println("RTPSession.sendData() packet creation failed.");
- e.printStackTrace();
- return null;
- }
-
- try {
- rtpMCSock.send(packet);
- //Debug
- if(this.debugAppIntf != null) {
- this.debugAppIntf.packetSent(1, (InetSocketAddress) packet.getSocketAddress(),
- new String("Sent multicast RTP packet of size " + packet.getLength() +
- " to " + packet.getSocketAddress().toString() + " via "
- + rtpMCSock.getLocalSocketAddress().toString()));
- }
- } catch (Exception e) {
- System.out.println("RTPSession.sendData() multicast failed.");
- e.printStackTrace();
- return null;
- }
-
- } else {
- // Loop over recipients
- Iterator<Participant> iter = partDb.getUnicastReceivers();
- while(iter.hasNext()) {
- InetSocketAddress receiver = iter.next().rtpAddress;
- DatagramPacket packet = null;
-
- if(RTPSession.rtpDebugLevel > 15) {
- System.out.println(" Sending to " + receiver.toString());
- }
-
- try {
- packet = new DatagramPacket(pktBytes,pktBytes.length,receiver);
- } catch (Exception e) {
- System.out.println("RTPSession.sendData() packet creation failed.");
- e.printStackTrace();
- return null;
- }
-
- //Actually send the packet
- try {
- rtpSock.send(packet);
- //Debug
- if(this.debugAppIntf != null) {
- this.debugAppIntf.packetSent(0, (InetSocketAddress) packet.getSocketAddress(),
- new String("Sent unicast RTP packet of size " + packet.getLength() +
- " to " + packet.getSocketAddress().toString() + " via "
- + rtpSock.getLocalSocketAddress().toString()));
- }
- } catch (Exception e) {
- System.out.println("RTPSession.sendData() unicast failed.");
- e.printStackTrace();
- return null;
- }
- }
- }
-
- //Update our stats
- this.sentPktCount++;
- this.sentOctetCount++;
-
- if(RTPSession.rtpDebugLevel > 5) {
- System.out.println("<- RTPSession.sendData(byte[]) " + pkt.getSeqNumber());
- }
- }
-
- return ret;
- }
-
- /**
- * Send RTCP App packet to receiver specified by ssrc
- *
- *
- *
- * Return values:
- * 0 okay
- * -1 no RTCP session established
- * -2 name is not byte[4];
- * -3 data is not byte[x], where x = 4*y for syme y
- * -4 type is not a 5 bit unsigned integer
- *
- * Note that a return value of 0 does not guarantee delivery.
- * The participant must also exist in the participant database,
- * otherwise the message will eventually be deleted.
- *
- * @param ssrc of the participant you want to reach
- * @param type the RTCP App packet subtype, default 0
- * @param name the ASCII (in byte[4]) representation
- * @param data the data itself
- * @return 0 if okay, negative value otherwise (see above)
- */
-
- public int sendRTCPAppPacket(long ssrc, int type, byte[] name, byte[] data) {
- if(this.rtcpSession == null)
- return -1;
-
- if(name.length != 4)
- return -2;
-
- if(data.length % 4 != 0)
- return -3;
-
- if(type > 63 || type < 0 )
- return -4;
-
- RtcpPktAPP pkt = new RtcpPktAPP(ssrc, type, name, data);
- this.rtcpSession.addToAppQueue(ssrc, pkt);
-
- return 0;
- }
- /**
- * Add a participant object to the participant database.
- *
- * If packets have already been received from this user, we will try to update the automatically inserted participant with the information provided here.
- *
- * @param p A participant.
- */
- public int addParticipant(Participant p) {
- //For now we make all participants added this way persistent
- p.unexpected = false;
- return this.partDb.addParticipant(0, p);
- }
-
- /**
- * Remove a participant from the database. All buffered packets will be destroyed.
- *
- * @param p A participant.
- */
- public void removeParticipant(Participant p) {
- partDb.removeParticipant(p);
- }
-
- public Iterator<Participant> getUnicastReceivers() {
- return partDb.getUnicastReceivers();
- }
-
- public Enumeration<Participant> getParticipants() {
- return partDb.getParticipants();
- }
-
- /**
- * End the RTP Session. This will halt all threads and send bye-messages to other participants.
- *
- * RTCP related threads may require several seconds to wake up and terminate.
- */
- public void endSession() {
- this.endSession = true;
-
- // No more RTP packets, please
- if(this.mcSession) {
- this.rtpMCSock.close();
- } else {
- this.rtpSock.close();
- }
-
- // Signal the thread that pushes data to application
- this.pktBufLock.lock();
- try { this.pktBufDataReady.signalAll(); } finally {
- this.pktBufLock.unlock();
- }
- // Interrupt what may be sleeping
- this.rtcpSession.senderThrd.interrupt();
-
- // Give things a chance to cool down.
- try { Thread.sleep(50); } catch (Exception e){ };
-
- this.appCallerThrd.interrupt();
-
- // Give things a chance to cool down.
- try { Thread.sleep(50); } catch (Exception e){ };
-
- if(this.rtcpSession != null) {
- // No more RTP packets, please
- if(this.mcSession) {
- this.rtcpSession.rtcpMCSock.close();
- } else {
- this.rtcpSession.rtcpSock.close();
- }
- }
- }
-
-
- /**
- * Check whether this session is ending.
- *
- * @return true if session and associated threads are terminating.
- */
- boolean isEnding() {
- return this.endSession;
- }
-
- /**
- * Overrides CNAME, used for outgoing RTCP packets.
- *
- * @param cname a string, e.g. username@hostname. Must be unique for session.
- */
- public void CNAME(String cname) {
- this.cname = cname;
- }
-
- /**
- * Get the current CNAME, used for outgoing SDES packets
- */
- public String CNAME() {
- return this.cname;
- }
-
- public long getSsrc() {
- return this.ssrc;
- }
-
- private void generateCNAME() {
- String hostname;
-
- if(this.mcSession) {
- hostname = this.rtpMCSock.getLocalAddress().getCanonicalHostName();
- } else {
- hostname = this.rtpSock.getLocalAddress().getCanonicalHostName();
- }
-
- //if(hostname.equals("0.0.0.0") && System.getenv("HOSTNAME") != null) {
- // hostname = System.getenv("HOSTNAME");
- //}
-
- cname = System.getProperty("user.name") + "@" + hostname;
- }
-
- /**
- * Change the RTP socket of the session.
- * Peers must be notified through SIP or other signalling protocol.
- * Only valid if this is a unicast session to begin with.
- *
- * @param newSock integer for new port number, check it is free first.
- */
- public int updateRTPSock(DatagramSocket newSock) {
- if(!mcSession) {
- rtpSock = newSock;
- return 0;
- } else {
- System.out.println("Can't switch from multicast to unicast.");
- return -1;
- }
- }
-
- /**
- * Change the RTCP socket of the session.
- * Peers must be notified through SIP or other signalling protocol.
- * Only valid if this is a unicast session to begin with.
- *
- * @param newSock the new unicast socket for RTP communication.
- */
- public int updateRTCPSock(DatagramSocket newSock) {
- if(!mcSession) {
- this.rtcpSession.rtcpSock = newSock;
- return 0;
- } else {
- System.out.println("Can't switch from multicast to unicast.");
- return -1;
- }
- }
-
- /**
- * Change the RTP multicast socket of the session.
- * Peers must be notified through SIP or other signalling protocol.
- * Only valid if this is a multicast session to begin with.
- *
- * @param newSock the new multicast socket for RTP communication.
- */
- public int updateRTPSock(MulticastSocket newSock) {
- if(mcSession) {
- this.rtpMCSock = newSock;
- return 0;
- } else {
- System.out.println("Can't switch from unicast to multicast.");
- return -1;
- }
- }
-
- /**
- * Change the RTCP multicast socket of the session.
- * Peers must be notified through SIP or other signalling protocol.
- * Only valid if this is a multicast session to begin with.
- *
- * @param newSock the new multicast socket for RTCP communication.
- */
- public int updateRTCPSock(MulticastSocket newSock) {
- if(mcSession) {
- this.rtcpSession.rtcpMCSock = newSock;
- return 0;
- } else {
- System.out.println("Can't switch from unicast to multicast.");
- return -1;
- }
- }
-
- /**
- * Update the payload type used for the session. It is represented as a 7 bit integer, whose meaning must be negotiated elsewhere (see IETF RFCs <a href="http://www.ietf.org/rfc/rfc3550.txt">3550</a> and <a href="http://www.ietf.org/rfc/rfc3550.txt">3551</a>)
- *
- * @param payloadT an integer representing the payload type of any subsequent packets that are sent.
- */
- public int payloadType(int payloadT) {
- if(payloadT > 128 || payloadT < 0) {
- return -1;
- } else {
- this.payloadType = payloadT;
- return this.payloadType;
- }
- }
-
- /**
- * Get the payload type that is currently used for outgoing RTP packets.
- *
- * @return payload type as integer
- */
- public int payloadType() {
- return this.payloadType;
- }
-
- /**
- * Should packets from unknown participants be returned to the application? This can be dangerous.
- *
- * @param doAccept packets from participants not added by the application.
- */
- public void naivePktReception(boolean doAccept) {
- naiveReception = doAccept;
- }
-
- /**
- * Are packets from unknown participants returned to the application?
- *
- * @return whether we accept packets from participants not added by the application.
- */
- public boolean naivePktReception() {
- return naiveReception;
- }
-
- /**
- * Set the number of RTP packets that should be buffered when a packet is
- * missing or received out of order. Setting this number high increases
- * the chance of correctly reordering packets, but increases latency when
- * a packet is dropped by the network.
- *
- * Packets that arrive in order are not affected, they are passed straight
- * to the application.
- *
- * The maximum delay is numberofPackets * packet rate , where the packet rate
- * depends on the codec and profile used by the sender.
- *
- * Valid values:
- * >0 - The maximum number of packets (based on RTP Timestamp) that may accumulate
- * 0 - All valid packets received in order will be given to the application
- * -1 - All valid packets will be given to the application
- *
- * @param behavior the be
- * @return the behavior set, unchanged in the case of a erroneous value
- */
- public int packetBufferBehavior(int behavior) {
- if(behavior > -2) {
- this.pktBufBehavior = behavior;
- // Signal the thread that pushes data to application
- this.pktBufLock.lock();
- try { this.pktBufDataReady.signalAll(); } finally {
- this.pktBufLock.unlock();
- }
- return this.pktBufBehavior;
- } else {
- return this.pktBufBehavior;
- }
- }
-
- /**
- * The number of RTP packets that should be buffered when a packet is
- * missing or received out of order. A high number increases the chance
- * of correctly reordering packets, but increases latency when a packet is
- * dropped by the network.
- *
- * A negative value disables the buffering, out of order packets will simply be dropped.
- *
- * @return the maximum number of packets that can accumulate before the first is returned
- */
- public int packetBufferBehavior() {
- return this.pktBufBehavior;
- }
-
- /**
- * Set whether the stack should operate in RFC 4585 mode.
- *
- * This will automatically call adjustPacketBufferBehavior(-1),
- * i.e. disable all RTP packet buffering in jlibrtp,
- * and disable frame reconstruction
- *
- * @param rtcpAVPFIntf the in
- */
- public int registerAVPFIntf(RTCPAVPFIntf rtcpAVPFIntf, int maxDelay, int earlyThreshold, int regularThreshold ) {
- if(this.rtcpSession != null) {
- this.packetBufferBehavior(-1);
- this.frameReconstruction = false;
- this.rtcpAVPFIntf = rtcpAVPFIntf;
- this.fbEarlyThreshold = earlyThreshold;
- this.fbRegularThreshold = regularThreshold;
- return 0;
- } else {
- return -1;
- }
- }
-
- /**
- * Unregisters the RTCP AVPF interface, thereby going from
- * RFC 4585 mode to RFC 3550
- *
- * You still have to adjust packetBufferBehavior() and
- * frameReconstruction.
- *
- */
- public void unregisterAVPFIntf() {
- this.fbEarlyThreshold = -1;
- this.fbRegularThreshold = -1;
- this.rtcpAVPFIntf = null;
- }
-
- /**
- * Enable / disable frame reconstruction in the packet buffers.
- * This is only relevant if getPacketBufferBehavior > 0;
- *
- * Default is true.
- */
- public void frameReconstruction(boolean toggle) {
- this.frameReconstruction = toggle;
- }
-
- /**
- * Whether the packet buffer will attempt to reconstruct
- * packet automatically.
- *
- * @return the status
- */
- public boolean frameReconstruction() {
- return this.frameReconstruction;
- }
-
- /**
- * The bandwidth currently allocated to the session,
- * in bytes per second. The default is 8000.
- *
- * This value is not enforced and currently only
- * used to calculate the RTCP interval to ensure the
- * control messages do not exceed 5% of the total bandwidth
- * described here.
- *
- * Since the actual value may change a conservative
- * estimate should be used to avoid RTCP flooding.
- *
- * see rtcpBandwidth(void)
- *
- * @return current bandwidth setting
- */
- public int sessionBandwidth() {
- return this.bandwidth;
- }
-
- /**
- * Set the bandwidth of the session.
- *
- * See sessionBandwidth(void) for details.
- *
- * @param bandwidth the new value requested, in bytes per second
- * @return the actual value set
- */
- public int sessionBandwidth(int bandwidth) {
- if(bandwidth < 1) {
- this.bandwidth = 8000;
- } else {
- this.bandwidth = bandwidth;
- }
- return this.bandwidth;
- }
-
-
- /**
- * RFC 3550 dictates that 5% of the total bandwidth,
- * as set by sessionBandwidth, should be dedicated
- * to RTCP traffic. This
- *
- * This should normally not be done, but is permissible in
- * conjunction with feedback (RFC 4585) and possibly
- * other profiles.
- *
- * Also see sessionBandwidth(void)
- *
- * @return current RTCP bandwidth setting, -1 means not in use
- */
- public int rtcpBandwidth() {
- return this.rtcpBandwidth;
- }
-
- /**
- * Set the RTCP bandwidth, see rtcpBandwidth(void) for details.
- *
- * This function must be
- *
- * @param bandwidth the new value requested, in bytes per second or -1 to disable
- * @return the actual value set
- */
- public int rtcpBandwidth(int bandwidth) {
- if(bandwidth < -1) {
- this.rtcpBandwidth = -1;
- } else {
- this.rtcpBandwidth = bandwidth;
- }
- return this.rtcpBandwidth;
- }
-
- /********************************************* Feedback message stuff ***************************************/
-
- /**
- * Adds a Picture Loss Indication to the feedback queue
- *
- * @param ssrcMediaSource
- * @return 0 if packet was queued, -1 if no feedback support, 1 if redundant
- */
- public int fbPictureLossIndication(long ssrcMediaSource) {
- int ret = 0;
-
- if(this.rtcpAVPFIntf == null)
- return -1;
-
- RtcpPktPSFB pkt = new RtcpPktPSFB(this.ssrc, ssrcMediaSource);
- pkt.makePictureLossIndication();
- ret = this.rtcpSession.addToFbQueue(ssrcMediaSource, pkt);
- if(ret == 0)
- this.rtcpSession.wakeSenderThread(ssrcMediaSource);
- return ret;
- }
-
- /**
- * Adds a Slice Loss Indication to the feedback queue
- *
- * @param ssrcMediaSource
- * @param sliFirst macroblock (MB) address of the first lost macroblock
- * @param sliNumber number of lost macroblocks
- * @param sliPictureId six least significant bits of the codec-specific identif
- * @return 0 if packet was queued, -1 if no feedback support, 1 if redundant
- */
- public int fbSlicLossIndication(long ssrcMediaSource, int[] sliFirst, int[] sliNumber, int[] sliPictureId) {
- int ret = 0;
- if(this.rtcpAVPFIntf == null)
- return -1;
-
- RtcpPktPSFB pkt = new RtcpPktPSFB(this.ssrc, ssrcMediaSource);
- pkt.makeSliceLossIndication(sliFirst, sliNumber, sliPictureId);
-
- ret = this.rtcpSession.addToFbQueue(ssrcMediaSource, pkt);
- if(ret == 0)
- this.rtcpSession.wakeSenderThread(ssrcMediaSource);
- return ret;
- }
-
- /**
- * Adds a Reference Picture Selection Indication to the feedback queue
- *
- * @param ssrcMediaSource
- * @param bitPadding number of padded bits at end of bitString
- * @param payloadType RTP payload type for codec
- * @param bitString RPSI information as natively defined by the video codec
- * @return 0 if packet was queued, -1 if no feedback support, 1 if redundant
- */
- public int fbRefPictureSelIndic(long ssrcMediaSource, int bitPadding, int payloadType, byte[] bitString) {
- int ret = 0;
-
- if(this.rtcpAVPFIntf == null)
- return -1;
-
- RtcpPktPSFB pkt = new RtcpPktPSFB(this.ssrc, ssrcMediaSource);
- pkt.makeRefPictureSelIndic(bitPadding, payloadType, bitString);
- ret = this.rtcpSession.addToFbQueue(ssrcMediaSource, pkt);
- if(ret == 0)
- this.rtcpSession.wakeSenderThread(ssrcMediaSource);
- return ret;
- }
-
- /**
- * Adds a Picture Loss Indication to the feedback queue
- *
- * @param ssrcMediaSource
- * @param bitString the original application message
- * @return 0 if packet was queued, -1 if no feedback support, 1 if redundant
- */
- public int fbAppLayerFeedback(long ssrcMediaSource, byte[] bitString) {
- int ret = 0;
-
- if(this.rtcpAVPFIntf == null)
- return -1;
-
- RtcpPktPSFB pkt = new RtcpPktPSFB(this.ssrc, ssrcMediaSource);
- pkt.makeAppLayerFeedback(bitString);
- ret = this.rtcpSession.addToFbQueue(ssrcMediaSource, pkt);
- if(ret == 0)
- this.rtcpSession.wakeSenderThread(ssrcMediaSource);
- return ret;
- }
-
-
- /**
- * Adds a RTP Feedback packet to the feedback queue.
- *
- * These are mostly used for NACKs.
- *
- * @param ssrcMediaSource
- * @param FMT the Feedback Message Subtype
- * @param PID RTP sequence numbers of lost packets
- * @param BLP bitmask of following lost packets, shared index with PID
- * @return 0 if packet was queued, -1 if no feedback support, 1 if redundant
- */
- public int fbPictureLossIndication(long ssrcMediaSource, int FMT, int[] PID, int[] BLP) {
- int ret = 0;
-
- if(this.rtcpAVPFIntf == null)
- return -1;
-
- RtcpPktRTPFB pkt = new RtcpPktRTPFB(this.ssrc, ssrcMediaSource, FMT, PID, BLP);
- ret = this.rtcpSession.addToFbQueue(ssrcMediaSource, pkt);
- if(ret == 0)
- this.rtcpSession.wakeSenderThread(ssrcMediaSource);
- return ret;
- }
-
- /**
- * Fetches the next sequence number for RTP packets.
- * @return the next sequence number
- */
- private int getNextSeqNum() {
- seqNum++;
- // 16 bit number
- if(seqNum > 65536) {
- seqNum = 0;
- }
- return seqNum;
- }
-
- /**
- * Initializes a random variable
- *
- */
- private void createRandom() {
- this.random = new Random(System.currentTimeMillis() + Thread.currentThread().getId()
- - Thread.currentThread().hashCode() + this.cname.hashCode());
- }
-
-
- /**
- * Generates a random sequence number
- */
- private void generateSeqNum() {
- if(this.random == null)
- createRandom();
-
- seqNum = this.random.nextInt();
- if(seqNum < 0)
- seqNum = -seqNum;
- while(seqNum > 65535) {
- seqNum = seqNum / 10;
- }
- }
-
- /**
- * Generates a random SSRC
- */
- private void generateSsrc() {
- if(this.random == null)
- createRandom();
-
- // Set an SSRC
- this.ssrc = this.random.nextInt();
- if(this.ssrc < 0) {
- this.ssrc = this.ssrc * -1;
- }
- }
-
- /**
- * Resolve an SSRC conflict.
- *
- * Also increments the SSRC conflict counter, after 5 conflicts
- * it is assumed there is a loop somewhere and the session will
- * terminate.
- *
- */
- protected void resolveSsrcConflict() {
- System.out.println("!!!!!!! Beginning SSRC conflict resolution !!!!!!!!!");
- this.conflictCount++;
-
- if(this.conflictCount < 5) {
- //Don't send any more regular packets out until we have this sorted out.
- this.conflict = true;
-
- //Send byes
- rtcpSession.sendByes();
-
- //Calculate the next delay
- rtcpSession.calculateDelay();
-
- //Generate a new Ssrc for ourselves
- generateSsrc();
-
- //Get the SDES packets out faster
- rtcpSession.initial = true;
-
- this.conflict = false;
- System.out.println("SSRC conflict resolution complete");
-
- } else {
- System.out.println("Too many conflicts. There is probably a loop in the network.");
- this.endSession();
- }
- }
-}