/// <summary>
/// setup the initial buffers and write the basic stream data to the db
/// </summary>
/// <param name="participant">for this participant</param>
/// <param name="stream">using this rtp stream</param>
public StreamRecorder( int participantID, RtpStream stream, ConferenceRecorderPC conferencePerfCounter )
{
this.rtpStream = stream;
this.perfCounter = conferencePerfCounter;
this.partID = participantID;
// We do *not* re-use existing streams if a stream goes away and comes back. This decision was made
// becuase it causes the client not to see the Rtcp data die & come back during playback, though it
// did during recording. This inconsistency was viewed to cause problems, and was removed.
InitStream();
buffers = new BufferRecorder[Constants.MaxBuffers];
bufferCount = Constants.InitialBuffers;
for ( int i = 0; i < bufferCount; i++)
{
buffers[i] = new BufferRecorder( i, streamID );
buffers[i].Overflowed += new EventHandler(this.OnOverflowException);
perfCounter.AddInstanceForCollection(buffers[i]);
}
curBufIndex = 0;
currentBuffer = buffers[curBufIndex];
rtpStream.FrameReceived += new MSR.LST.Net.Rtp.RtpStream.FrameReceivedEventHandler(FrameReceived);
}
void OnStreamRemoved(MSR.LST.Net.Rtp.RtpStream rtpStream)
{
//Debug.WriteLine("OnStreamRemoved ssrc=" + rtpStream.SSRC.ToString() + ";cname=" + rtpStream.Properties.CName);
// Do not check (or care) whether the RTPMessageSender has been disposed,
// because we will get lots of RtpStreamRemoved events when the RtpSession is closed.
// Unregister the ParticipantModel and remove it from the classroom.
string cname = rtpStream.Properties.CName;
if (this.m_Participants.ContainsKey(cname))
{
using (Synchronizer.Lock(this.m_Classroom.SyncRoot)) {
if (this.m_Classroom.Participants.Contains(m_Participants[cname]))
{
this.m_Classroom.Participants.Remove(m_Participants[cname]);
}
}
this.m_Participants.Remove(cname);
}
//If the stream being removed is our currently associated instructor:
if (cname.Equals(m_AssociationCname))
{
using (Synchronizer.Lock(this.m_Model.Network.SyncRoot)) {
this.m_Model.Network.Association = null;
}
m_AssociationCname = null;
}
if (this.m_Receivers.ContainsKey(cname))
{
uint remoteSsrc = this.m_Receivers[cname].RemoteSsrc;
if (this.m_SsrcToSenderId.ContainsKey(remoteSsrc))
{
this.m_SsrcToSenderId.Remove(remoteSsrc);
}
else
{
Trace.WriteLine("!!!!Warning: Failed to find SSRC in lookup table when removing stream.");
}
// Discard all pending Nacks so the NackManager doesn't keep nacking them forever.
this.NackManager.Discard(remoteSsrc, Range.UNIVERSE);
//Clean up the receiver
//Debug.WriteLine("Removed receiver cname: " + cname + "; receiver SSRC: " + remoteSsrc.ToString());
this.m_Receivers[cname].Dispose();
this.m_Receivers.Remove(cname);
}
else
{
//Debug.WriteLine("Removed a stream for which we have no capability receiver cname: " + cname);
}
}
public static Guid IDFromRtpStream(RtpStream rtpStream)
{
string id = rtpStream.Properties.GetPrivateExtension(PEP_IDENTIFIER);
if(id != null)
{
return new Guid(id);
}
else
{
throw new InvalidOperationException(Strings.StreamLacksACapabilityidentifier);
}
}
void OnStreamAdded(MSR.LST.Net.Rtp.RtpStream rtpStream)
{
//Debug.WriteLine("OnStreamAdded ssrc=" + rtpStream.SSRC.ToString() + ";cname=" + rtpStream.Properties.CName);
using (Synchronizer.Lock(this.m_Classroom.SyncRoot)) {
if (rtpStream.SSRC != this.m_Capability.RtpSender.SSRC)
{
//We need the participant Guid before we can set up the participant model. Do that on receipt of the first message from a given remote node.
//Debug.WriteLine("Adding stream ssrc: " + rtpStream.SSRC.ToString());
}
else
{
//Debug.WriteLine("Ignoring RTP Stream Add because the stream SSRC matches the RTPSender SSRC");
}
}
}
public RTPMessageReceiver(RTPMessageSender sender, RtpStream stream, PresenterModel model, ClassroomModel classroom, ParticipantModel participant)
{
this.m_Model = model;
this.m_Sender = sender;
this.m_RtpStream = stream;
this.m_Context = new ReceiveContext(model, classroom, participant);
this.m_ContextArgs = new object[] { this.m_Context };
this.m_Queue = new MessageProcessingQueue(this);
this.m_Serializer = new BinaryFormatter();
this.m_Assembler = new ChunkAssembler();
this.m_Assembler.Nack += new ChunkAssembler.NackDelegate(this.HandleAssemblerNack);
this.m_RtpStream.FrameReceived += new RtpStream.FrameReceivedEventHandler(this.HandleFrameReceived);
}
static void stream_FrameReceived(object sender, RtpStream.FrameReceivedEventArgs ea)
{
Console.Out.WriteLine("Frame received of length: " + ea.Frame.Length);
byte[] hash = MD5.Create().ComputeHash(ea.Frame.Buffer, ea.Frame.Index, ea.Frame.Length);
// compare arrays:
for (int i = 0; i < oracleHash.Length; i++)
{
if (oracleHash[i] != hash[i])
{
Console.Out.WriteLine("Hash values not equal!");
return;
}
}
Console.Out.WriteLine("Hash value is good!");
}
public static CapabilityType ChannelFromRtpStream(RtpStream rtpStream)
{
string chan = rtpStream.Properties.GetPrivateExtension(PEP_CHANNEL);
if(chan != null)
{
if (Boolean.Parse(chan))
{
return CapabilityType.Channel;
}
else
{
return CapabilityType.Owned;
}
}
else
{
return CapabilityType.Unknown;
}
}
public static DynamicProperties DynaPropsFromRtpStream(RtpStream rtpStream)
{
DynamicProperties dynaProps = new DynamicProperties();
dynaProps.ID = IDFromRtpStream(rtpStream);
dynaProps.Name = rtpStream.Properties.Name;
dynaProps.SharedFormID = SharedFormIDFromRtpStream(rtpStream);
// Establish the channelness or ownership of this capability
CapabilityType streamType = ChannelFromRtpStream(rtpStream);
// by default, capabilities are owned (i.e. the "unknown" streams are considered owned)
dynaProps.Channel = (streamType == CapabilityType.Channel);
if (streamType == CapabilityType.Owned) // the stream is being sent by the owner
{
dynaProps.OwnerName = rtpStream.Properties.CName;
}
return dynaProps;
}
public FrameReceivedEventArgs(RtpStream rtpStream, BufferChunk frame)
{
RtpStream = rtpStream;
Frame = frame;
}
public IPStreamPair(IPAddress ip, RtpStream rtp)
{ senderIP = ip; stream = rtp; }
public void StopListening()
{
if( rtpStream != null )
{
rtpStream.FrameReceived -= new RtpStream.FrameReceivedEventHandler(FrameReceived);
this.rtpStream = null;
}
int curIndex = curBufIndex;
if( buffers != null )
{
do
{
BufferRecorder buf = buffers[curBufIndex];
perfCounter.RemoveInstanceForCollection(buf);
buf.Dispose();
curBufIndex = (curBufIndex + 1) % bufferCount;
}
while ( curBufIndex != curIndex);
this.buffers = null;
}
}
private void ValidateStream(RtpStream rtpStream)
{
// Make sure that the capability properties of the streams agree
if((ChannelFromRtpStream(rtpStream) == CapabilityType.Channel) != Channel ||
IDFromRtpStream(rtpStream) != ID ||
SharedFormIDFromRtpStream(rtpStream) != SharedFormID)
{
throw new ArgumentException("Stream to add does not match the settings for this capability.");
}
}
/// <summary>
/// DistributePackets is responsible for receiving all incoming packets on the Rtp Listener,
/// casting them into RtpPackets, creating new RtpStreams if one doesn't exist for the RtpPacket's SSRC,
/// then calling RtpStream.newPacket(rtpPacket) to place the RtpPacket into the RtpStream's Queue for processing.
/// </summary>
private void DistributePackets()
{
while (newPacket.WaitOne())
{
while (receivedPackets.Count > 0)
{
object[] ao = (object[])receivedPackets.Dequeue();
BufferChunk bc = (BufferChunk)ao[0];
IPEndPoint ep = (IPEndPoint)ao[1];
try
{
//Turn the raw UDP packet data into an Rtp packet
RtpPacketBase packet = new RtpPacketBase(bc);
// For now, we support 2 types of packets - RtpPacket and RtpPacketFec. If
// the number of packet types grows, we may need to push the casting onto
// the streams, since they know what type of packets they expect. For now
// we will handle the casting here. JVE 6/17/2004
if (packet.PayloadType == PayloadType.FEC)
{
packet = new RtpPacketFec(packet);
}
else
{
packet = new RtpPacket(packet);
}
#region Fault Injection
#if FaultInjection
if (rtpSession.DropPacketsPercent > 0)
{
if (rtpSession.Rnd.Next(1, 100) <= rtpSession.DropPacketsPercent)
{
if (packet.PayloadType == PayloadType.FEC)
{
RtpPacketFec fecPacket = (RtpPacketFec)packet;
string msg = string.Format(CultureInfo.CurrentCulture,
"Dropping fec packet: {0}, FecIndex: {1}, DataRangeMin: {2}",
fecPacket.Sequence, fecPacket.FecIndex, fecPacket.DataRangeMin);
Trace.WriteLine(msg);
pcDroppedFecPackets++;
pcDroppedFecBytes += packet.PayloadSize;
}
else
{
RtpPacket dataPacket = (RtpPacket)packet;
string msg = string.Format(CultureInfo.CurrentCulture,
"Dropping data packet: {0}, FecIndex: {1}, FrameIndex: {2}, TS: {3}",
dataPacket.Sequence, dataPacket.FecIndex, dataPacket.FrameIndex, dataPacket.TimeStamp);
Trace.WriteLine(msg);
pcDroppedDataPackets++;
pcDroppedDataBytes += packet.PayloadSize;
}
ReturnBuffer(bc);
continue;
}
}
#endif
#endregion Fault Injection
// Get the stream if it exists
RtpStream stream = rtpSession.GetStream(packet.SSRC, ep.Address);
if (stream != null)
{
stream.ProcessPacket(packet);
}
else
{
// Otherwise return the packet to the pool
ReturnBuffer(bc);
unchecked { pcStreamlessPackets++; }
}
}
catch (ThreadAbortException) {}
catch (InvalidRtpPacketException e)
{
HandleInvalidPacket(bc, ep, e.ToString());
ReturnBuffer(bc);
}
catch (PoolExhaustedException e)
{
LogEvent(e.ToString(), EventLogEntryType.Error, (int)RtpEL.ID.UnboundedGrowth);
return; // Exit the thread gracefully
}
catch (Exception e)
{
ReturnBuffer(bc);
LogEvent(e.ToString(), EventLogEntryType.Error, (int)RtpEL.ID.Error);
}
}
}
}
/// <summary>
/// Overridden because we don't want to hook the frame received event
/// </summary>
/// <param name="rtpStream"></param>
public override void StreamAdded(RtpStream rtpStream)
{
if(this.rtpStream != null)
{
this.rtpStream.DataStarted -= new MSR.LST.Net.Rtp.RtpStream.DataStartedEventHandler(rtpStream_DataStarted);
this.rtpStream.DataStopped -= new MSR.LST.Net.Rtp.RtpStream.DataStoppedEventHandler(rtpStream_DataStopped);
}
lock(this)
{
this.rtpStream = rtpStream;
this.rtpStreams.Add(rtpStream);
}
rtpStream.IsUsingNextFrame = true;
// We only need to hook these events if we are remote players, not senders
if(!IsSender)
{
rtpStream.DataStarted += new MSR.LST.Net.Rtp.RtpStream.DataStartedEventHandler(rtpStream_DataStarted);
rtpStream.DataStopped += new MSR.LST.Net.Rtp.RtpStream.DataStoppedEventHandler(rtpStream_DataStopped);
}
}
// CF1
private void LeaveRtpSession()
{
UnhookRtpEvents();
if(rtpSession != null)
{
rtpSession.Dispose();
rtpSession = null;
rtpSender = null;
rtpStream = null;
}
}
public IPStreamPair(IPAddress ip, RtpStream rtp)
{ senderIP = ip; stream = rtp; }
public virtual void StreamRemoved(RtpStream rtpStream)
{
lock(this)
{
if(isPlaying)
{
rtpStream.FrameReceived -= new RtpStream.FrameReceivedEventHandler(frameReceived);
}
rtpStreams.Remove(rtpStream);
}
// We keep playing regardless of who leaves if it's a capability channel.
// If it's not a channel, then close it if the owner leaves
// (pfb, 21-Sep-04) Removing code here because Conference checks for no streams left.
}
public virtual void StreamAdded(RtpStream rtpStream)
{
ValidateStream(rtpStream);
lock(this)
{
if (isPlaying)
{
rtpStream.FrameReceived += new RtpStream.FrameReceivedEventHandler(frameReceived);
}
rtpStreams.Add(rtpStream);
}
}
private void ValidateStream(RtpStream rtpStream)
{
// Make sure that the capability properties of the streams agree
if((ChannelFromRtpStream(rtpStream) == CapabilityType.Channel) != Channel ||
IDFromRtpStream(rtpStream) != ID ||
SharedFormIDFromRtpStream(rtpStream) != SharedFormID)
{
throw new ArgumentException(Strings.StreamDoesNotMatchSettings);
}
}
private void frameReceived(object sender, RtpStream.FrameReceivedEventArgs frea)
{
MemoryStream ms = new System.IO.MemoryStream((byte[])frea.Frame);
object o = bf.Deserialize(ms);
Participant participant = (Participant)Conference.participants[frea.RtpStream.Properties.CName];
Conference.FormInvoke(ObjectReceived, new object[] { this, new ObjectReceivedEventArgs(participant, o) } );
}
/// <summary>
/// Processes a message received over the RTP network interface.
/// </summary>
private void HandleFrameReceived(object sender, RtpStream.FrameReceivedEventArgs args)
{
Debug.Assert(args.RtpStream == this.m_RtpStream);
BufferChunk chunk = args.Frame;
try {
// Attempt to deserialize the contents of the frame.
using (MemoryStream stream = new MemoryStream(chunk.Buffer, chunk.Index, chunk.Length)) {
object message = this.m_Serializer.Deserialize(stream);
// If the message is a chunked, process it with the Chunk Assembler.
// (Messages don't have to be chunked, in which case they are processed
// immediately below). If the chunk is the last remaining chunk composing
// a message, then the Assembler returns the completed message.
if (message is Chunk) {
Chunk chunked = ((Chunk)message);
// Ensure that no more NACKs are sent for this chunk, if it was recovered.
if (chunked.FrameSequence > ulong.MinValue)
this.m_Sender.NackManager.Discard(this.m_RtpStream.SSRC, chunked.FrameSequence);
// Ensure that no futile NACKs are sent for unrecoverable chunks.
if (chunked.OldestRecoverableFrame - 1 > ulong.MinValue)
this.m_Sender.NackManager.Discard(this.m_RtpStream.SSRC,
new Range(ulong.MinValue, chunked.OldestRecoverableFrame - 1));
message = this.m_Assembler.Add(chunked);
} else if (message is RtpNackMessage) {
// Otherwise, if the message is a NACK, delegate it to the RTP sender,
// which attempts to resend chunks from its buffer.
RtpNackMessage nack = ((RtpNackMessage)message);
this.m_Sender.ProcessNack(nack);
return;
}
// If we have a valid/complete message, queue it for processing on the separate
// message execution thread.
if (message is IEnumerable<object>) {
foreach (object decoded in (IEnumerable<object>)message) {
if (decoded is Message) {
// NOTE: Added by CMPRINCE for testing network performance
// Save this message
this.m_Model.ViewerState.Diagnostic.LogMessageRecv((Message)decoded);
Debug.WriteLine(string.Format("Received message: {0} bytes, type {1}",
chunk.Length, decoded.GetType()), this.GetType().ToString());
Debug.Indent();
try {
this.m_Queue.ProcessMessage((Message)decoded);
} finally {
Debug.Unindent();
}
} else {
Trace.WriteLine("Received invalid message: " + decoded != null ? decoded.GetType().ToString() : null,
this.GetType().ToString());
}
}
} else if (message != null) {
Trace.WriteLine("Received invalid message: " + message.GetType().ToString(),
this.GetType().ToString());
}
}
}
catch(Exception e) {
// The application should not crash on account of malformed messages sent from remote clients.
// Therefore, we catch all exceptions. We only want to print an error message.
Trace.WriteLine("Error deserializing a message: " + e.ToString() + "\r\n" + e.StackTrace, this.GetType().ToString());
}
}
internal void RaiseRtpStreamTimeoutEvent(RtpStream stream)
{
rtpStreamTimeoutEvents++;
object[] args = {this, new RtpEvents.RtpStreamEventArgs(stream)};
EventThrower.QueueUserWorkItem(new RtpEvents.RaiseEvent(RtpEvents.RaiseRtpStreamTimeoutEvent), args);
}
public void Add(uint ssrc, RtpStream rtpStream)
{
Dictionary.Add(ssrc, rtpStream);
}
public InvalidPacketInFrameEventArgs(RtpStream rtpStream, string reason)
{
RtpStream = rtpStream;
Reason = reason;
}
// CF1, CF3
private void RtpStreamAdded(object sender, RtpEvents.RtpStreamEventArgs ea)
{
rtpStream = ea.RtpStream;
}
public RtpStreamEventArgs(RtpStream rtpStream)
{
RtpStream = rtpStream;
}
public void Add(uint ssrc, RtpStream rtpStream)
{
Dictionary.Add(ssrc, rtpStream);
}
public static Guid IDFromRtpStream(RtpStream rtpStream)
{
string id = rtpStream.Properties.GetPrivateExtension(PEP_IDENTIFIER);
if(id != null)
{
return new Guid(id);
}
else
{
throw new InvalidOperationException("Stream lacks a CapabilityIdentifier in the external private extensions. \n"
+ "Streams without this are not supported by the ConferenceXP API.");
}
}
public bool ContainsStream(RtpStream stream)
{
return (streamsAndIPs.GetStream(stream.SSRC) != null);
}
public static Guid SharedFormIDFromRtpStream(RtpStream rtpStream)
{
string sfid = rtpStream.Properties.GetPrivateExtension(PEP_SHAREDFORM);
if(sfid != null)
{
return new Guid(sfid);
}
else
{
return Guid.Empty;
}
}
public FrameOutOfSequenceEventArgs(RtpStream rtpStream, int lostFrames, string message)
{
RtpStream = rtpStream;
LostFrames = lostFrames;
Message = message;
}
private void FrameReceived(object sender, RtpStream.FrameReceivedEventArgs ea)
{
ShowMessage(string.Format(CultureInfo.CurrentCulture, "{0}: {1}", ea.RtpStream.Properties.Name,
(string)ea.Frame));
}
public PacketOutOfSequenceEventArgs ( RtpStream rtpStream, int lostPackets, string message )
{
RtpStream = rtpStream;
LostPackets = lostPackets;
Message = message;
}
private void FrameReceived(object sender, RtpStream.FrameReceivedEventArgs frea)
{
FrameWithTicks frame = new FrameWithTicks(frea.Frame);
/* A number of considerations caused this design...
*
* Due to wanting the most accurate timestamp possible, the frame is stamped with the time
* (by putting it in the FrameWithTicks structure), and then the ProcessFrame method is
* called from the ThreadPool.
*
* However, this caused problems because processing the frames and saving them to disk were
* contending for time on the threadpool. Due to the nature of the design of Archiver, it's
* important that the frames are processed with higher priority than saving them to disk
* (this minimizes the overhead of exceptions (cpu utilization) during high-stress periods,
* causing the frames to be lost with the least amount of hiccups on the server.
*
* So here we choose to process the frame on this thread only if we know that it won't get
* immediate attention on the threadpool.
*/
int workerThreads, ioThreads;
ThreadPool.GetAvailableThreads(out workerThreads, out ioThreads);
if( workerThreads > 0 )
{
ThreadPool.QueueUserWorkItem( new WaitCallback(ProcessFrame), frame );
}
else
{
Trace.WriteLine("No threads available. Processing frame on EventThrower thread.");
ProcessFrame(frame);
}
}
public static void FrameIncomplete(RtpStream rtpStream, int framesLost)
{
// Event logging and perf counting are done in called method
rtpStream.RaiseFrameOutOfSequenceEvent(framesLost, Strings.IncompleteFrameReceived);
}
public static void FrameIncomplete(RtpStream rtpStream, int framesLost)
{
// Event logging and perf counting are done in called method
rtpStream.RaiseFrameOutOfSequenceEvent(framesLost, "Incomplete Frame Received -- Frame Lost");
}