public RTPMessageSender(IPEndPoint ep, PresenterModel model, ClassroomModel classroom)
        {
            this.m_Model = model;
            this.m_Classroom = classroom;

            this.m_RtpLocalParticipant = new RtpLocalParticipant(this.m_Model.Participant);

            using(Synchronizer.Lock(this)) {
                // Register the stream event listeners first, since otherwise there would be a chance
                // that streams could be added between creating the RtpSession (which connects immediately).
                this.m_ParticipantManager = new ParticipantManager(this);

                this.m_RtpSession = new RtpSession(ep, this.m_RtpLocalParticipant, true, true);

                // TODO: Choose a meaningful value for the RtpSender name.
                ushort fec;
                short interpacketdelay;
                using (Synchronizer.Lock(model.SyncRoot)) {
                    using (Synchronizer.Lock(model.ViewerState.SyncRoot)) {
                        fec = (ushort)model.ViewerState.ForwardErrorCorrection;
                        interpacketdelay = (short)model.ViewerState.InterPacketDelay;
                    }
                }
                if( fec == 0 )
                    this.m_RtpSender = this.m_RtpSession.CreateRtpSender( "Classroom Presenter", PayloadType.dynamicPresentation, null );
                else
                    this.m_RtpSender = this.m_RtpSession.CreateRtpSenderFec( "Classroom Presenter", PayloadType.dynamicPresentation, null, 0, fec );
                this.m_RtpSender.DelayBetweenPackets = interpacketdelay;

                // Initialize the message chunking utilities.
                this.m_Encoder = new Chunk.ChunkEncoder();
                // TODO: Make the buffer size dynamic, ie., grow if we send a single very large message.
                // Make the buffer store up to 5MB worth of data.
                this.m_FrameBuffer = new FrameBuffer(5 * 1024 * 1024 / this.m_Encoder.MaximumChunkSize);

                // Create the NackManager which is responsible for sending NACKs on behalf of
                // our set of RTPMessageReceivers.
                this.m_NackManager = new RTPNackManager(this, this.m_Classroom);
            }

            // Create network services outside of the "lock(this)" so they can lock their own objects
            // without worrying about locking order.

            // Create the PresenterNetworkService which will watch for changes to the model and send messages.
            this.m_PresenterNetworkService = new PresenterNetworkService(this, this.m_Model);

            // Create the StudentSubmissionsNetworkService which will watch for requests to submit and send messages.
            this.m_StudentSubmissionNetworkService = new StudentSubmissionNetworkService(this, this.m_Model);

            // Create the SynchronizationNetworkService which will watch for all synchronization messages.
            this.m_SynchronizationNetworkService = new SynchronizationNetworkService( this, this.m_Model );

            // Create the ScriptingNetworkService which will watch for all scripting messages.
            this.m_ScriptingNetworkService = new ScriptingNetworkService( this, this.m_Model );

            // Create the BeaconService which will broadcast periodic information about the presentation.
            this.m_BeaconService = new Beacons.DefaultBeaconService(this, this.m_Model);
        }
        public CXPCapabilityMessageSender(PresenterModel model, PresenterCapability capability)
        {
            this.m_Model = model;
            this.m_LocalId = m_Model.Participant.Guid;
            this.m_Classroom = new ClassroomModel(null, "CXP Capability Classroom", ClassroomModelType.CXPCapability);
            this.m_Capability = capability;
            this.m_Participants = new Dictionary<string, ParticipantModel>();
            this.m_SsrcToSenderId = new Dictionary<uint, Guid>();
            this.m_Receivers = new Dictionary<string, CXPCapabilityMessageReceiver>();

            m_Capability.OnStreamAdded += new PresenterCapability.OnStreamAddedHandler(OnStreamAdded);
            m_Capability.OnStreamRemoved +=new PresenterCapability.OnStreamRemovedHandler(OnStreamRemoved);
            using(Synchronizer.Lock(this)) {
                // Initialize the message chunking utilities.
                this.m_Encoder = new Chunk.ChunkEncoder();
                // TODO: Make the buffer size dynamic, ie., grow if we send a single very large message.
                // Make the buffer store up to 5MB worth of data.
                this.m_FrameBuffer = new FrameBuffer(5 * 1024 * 1024 / this.m_Encoder.MaximumChunkSize);

                // Create the NackManager which is responsible for sending NACKs on behalf of
                // our set of RTPMessageReceivers.
                this.m_NackManager = new RTPNackManager(this, this.m_Classroom);
            }

            // Create network services outside of the "lock(this)" so they can lock their own objects
            // without worrying about locking order.

            // Create the PresenterNetworkService which will watch for changes to the model and send messages.
            this.m_PresenterNetworkService = new PresenterNetworkService(this, this.m_Model);

            // Create the StudentSubmissionsNetworkService which will watch for requests to submit and send messages.
            this.m_StudentSubmissionNetworkService = new StudentSubmissionNetworkService(this, this.m_Model);

            // Create the SynchronizationNetworkService which will watch for all synchronization messages.
            this.m_SynchronizationNetworkService = new SynchronizationNetworkService( this, this.m_Model );

            // Create the ScriptingNetworkService which will watch for all scripting messages.
            this.m_ScriptingNetworkService = new ScriptingNetworkService( this, this.m_Model );

            // Create the BeaconService which will broadcast periodic information about the presentation.
            this.m_BeaconService = new Beacons.DefaultBeaconService(this, this.m_Model);

            // Report Network status to the UI
            m_CapabilityNetworkStatus = new CapabilityNetworkStatus(this.m_Model);
            m_CapabilityNetworkStatus.Register();

            // Send an initial message to announce our node to others in the venue.
            SendObject(new CapabilityMessageWrapper(null, m_LocalId, Guid.Empty, m_Capability.IsSender));
        }