internal RtpPacketFec(RtpPacketBase packet) : base(packet)
{
if (PayloadType != PayloadType.FEC)
{
throw new ArgumentException("The provided packet is not an fec packet!");
}
}
protected override void ResetDecodingState(RtpPacketBase packet)
{
ushort packetsInFrame;
if (packet.PayloadType == PayloadType)
{
packetsInFrame = ((RtpPacket)packet).PacketsInFrame;
}
else
{
packetsInFrame = ((RtpPacketFec)packet).PacketsInFrame;
}
if (dataPxExp != packetsInFrame)
{
// Resize data structures appropriately
dataPxExp = packetsInFrame;
fecPxExp = (ushort)(dataPxExp * fecPercent / 100);
if (dataPxExp * fecPercent % 100 > 0)
{
fecPxExp++;
}
fecPxExp = Math.Min(fecPxExp, RS_Fec.MaxChecksumPackets);
SetDecoder();
InitializeDCRStorage();
}
base.ResetDecodingState(packet);
}
protected virtual void ResetDecodingState(RtpPacketBase packet)
{
if (packet.PayloadType == PayloadType)
{
RtpPacket rtpPacket = (RtpPacket)packet;
minSeq = unchecked ((ushort)(rtpPacket.Sequence - rtpPacket.FecIndex));
}
else
{
minSeq = ((RtpPacketFec)packet).DataRangeMin;
}
maxSeq = unchecked ((ushort)(minSeq + dataPxExp - 1));
rangeInitialized = true;
recoveryIndex = 0;
}
internal override void ProcessPacket(RtpPacketBase packet)
{
// If any part of this code throws an exception we need to clean up what we have and
// reset back to a default state so we can start over.
try
{
PayloadType pt = packet.PayloadType;
ValidatePayloadType(pt);
// Process packet, depending on payload type
if (pt == this.pt)
{
ProcessPacketData((RtpPacket)packet);
}
else
{
ProcessPacketFec((RtpPacketFec)packet);
}
// See if we have collected enough packets
if (dataPxAct == dataPxExp)
{
ForwardDataPacketsToBase();
}
else if (dataPxAct + fecPxAct == dataPxExp)
{
Decode();
ForwardDataPacketsToBase();
}
}
catch (ThreadAbortException) {} // Because we catch a generic exception next
catch (Exception e)
{
eventLog.WriteEntry(e.ToString(), EventLogEntryType.Error, (int)RtpEL.ID.Error);
ForwardDataPacketsToBase();
}
}
internal RtpPacket(RtpPacketBase packet) : base(packet)
{
}
/// <summary>
/// Create a packet from an existing packet
/// </summary>
/// <param name="packet"></param>
internal RtpPacketBase(RtpPacketBase packet)
{
buffer = packet.buffer;
}
/// <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(
"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(
"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>
/// Method that converts RtpPacketBase to an RtpPacket and forwards
/// </summary>
internal virtual void ProcessPacket(RtpPacketBase packet)
{
ProcessPacket((RtpPacket)packet);
}
protected override void ResetDecodingState(RtpPacketBase packet)
{
ushort packetsInFrame;
if(packet.PayloadType == PayloadType)
{
packetsInFrame = ((RtpPacket)packet).PacketsInFrame;
}
else
{
packetsInFrame = ((RtpPacketFec)packet).PacketsInFrame;
}
if(dataPxExp != packetsInFrame)
{
// Resize data structures appropriately
dataPxExp = packetsInFrame;
fecPxExp = (ushort)(dataPxExp * fecPercent / 100);
if(dataPxExp * fecPercent % 100 > 0)
{
fecPxExp++;
}
fecPxExp = Math.Min(fecPxExp, RS_Fec.MaxChecksumPackets);
SetDecoder();
InitializeDCRStorage();
}
base.ResetDecodingState(packet);
}
protected virtual void ResetDecodingState(RtpPacketBase packet)
{
if(packet.PayloadType == PayloadType)
{
RtpPacket rtpPacket = (RtpPacket)packet;
minSeq = unchecked((ushort)(rtpPacket.Sequence - rtpPacket.FecIndex));
}
else
{
minSeq = ((RtpPacketFec)packet).DataRangeMin;
}
maxSeq = unchecked((ushort)(minSeq + dataPxExp - 1));
rangeInitialized = true;
recoveryIndex = 0;
}
internal override void ProcessPacket(RtpPacketBase packet)
{
// If any part of this code throws an exception we need to clean up what we have and
// reset back to a default state so we can start over.
try
{
PayloadType pt = packet.PayloadType;
ValidatePayloadType(pt);
// Process packet, depending on payload type
if(pt == this.pt)
{
ProcessPacketData((RtpPacket)packet);
}
else
{
ProcessPacketFec((RtpPacketFec)packet);
}
// See if we have collected enough packets
if(dataPxAct == dataPxExp)
{
ForwardDataPacketsToBase();
}
else if(dataPxAct + fecPxAct == dataPxExp)
{
Decode();
ForwardDataPacketsToBase();
}
}
catch(ThreadAbortException){} // Because we catch a generic exception next
catch(Exception e)
{
eventLog.WriteEntry(e.ToString(), EventLogEntryType.Error, (int)RtpEL.ID.Error);
ForwardDataPacketsToBase();
}
}
/// <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(
"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(
"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);
}
}
}
}
internal RtpPacketFec(RtpPacketBase packet) : base(packet)
{
if(PayloadType != PayloadType.FEC)
{
throw new ArgumentException("The provided packet is not an fec packet!");
}
}
internal RtpPacket(RtpPacketBase packet) : base(packet){}
/// <summary>
/// Create a packet from an existing packet
/// </summary>
/// <param name="packet"></param>
internal RtpPacketBase(RtpPacketBase packet)
{
buffer = packet.buffer;
}
/// <summary>
/// Method that converts RtpPacketBase to an RtpPacket and forwards
/// </summary>
internal virtual void ProcessPacket(RtpPacketBase packet)
{
ProcessPacket((RtpPacket)packet);
}
