private void ProcessPacketFec(RtpPacketFec packet)
{
pcFecPacketsLost += LostPackets(ref maxFecSeq, packet.Sequence);
pcFecPackets++;
pcFecBytes += packet.PayloadSize;
if (InRangeFec(packet))
{
// New sequence of packets
if (dataPxAct + fecPxAct == 0)
{
ResetDecodingState(packet);
}
int checksumFecIndex = packet.FecIndex;
// Duplicate packet check for flaky networks
if (dataPx[dataPxExp + checksumFecIndex] != null)
{
eventLog.WriteEntry("Duplicate packet received!", EventLogEntryType.Warning,
(int)RtpEL.ID.DuplicatePacketReceived);
return;
}
fecPxAct++;
dataPx[dataPxExp + checksumFecIndex] = packet;
data[dataPxExp + checksumFecIndex] = packet.Payload;
recovery[recoveryIndex++] = getBufferHandler();
}
}
internal void ReturnFecPacket(RtpPacketFec packet)
{
Debug.Assert(packet != null);
packet.Reset();
fecPool.Push(packet);
}
internal void SendPacketFec(RtpPacketFec packet)
{
packet.Sequence = fecSeq++;
packet.DataRangeMin = dataRangeMin;
packet.PacketsInFrame = cDataPx;
packet.SSRC = SSRC;
packet.FecIndex = checksumFecIndex++;
rtpNetworkSender.Send((BufferChunk)packet);
fecPackets++;
fecBytes += packet.PayloadSize;
}
protected void SendPacketsFec()
{
checksumFecIndex = 0;
for (int i = 0; i < cFecPx; i++)
{
RtpPacketFec packet = checksumPx[i];
packet.PayloadSize = checksum[i].Length;
SendPacketFec(packet);
checksum[i].Reset(checksum[i].Index, 0);
}
// Clear cache of data packets
ClearData();
}
/// <summary>
/// Initialize storage for Data and Checksum
/// </summary>
protected void InitializeDCStorage()
{
dataPx = new RtpPacket[cDataPx];
data = new BufferChunk[cDataPx];
ReturnFecPackets();
checksumPx = new RtpPacketFec[cFecPx];
checksum = new BufferChunk[cFecPx];
for (int i = 0; i < cFecPx; i++)
{
RtpPacketFec packet = GetPacketFec();
checksumPx[i] = packet;
checksum[i] = packet.Payload;
}
}
// Check to see if packet is inside the recovery range
protected bool InRangeFec(RtpPacketFec packet)
{
bool inRange = true;
if (rangeInitialized)
{
ushort minDiff = unchecked ((ushort)(packet.DataRangeMin - minSeq));
// Correct data range but not needed - late (frame already complete)
// OR Wrong data range - really late
if ((minDiff == 0 && (dataPxAct + fecPxAct == 0)) || minDiff > HALF_USHORT_MAX)
{
inRange = false;
pcFecPacketsLate++;
ReturnFecBuffer(packet.ReleaseBuffer());
}
else if (minDiff != 0) // Wrong data range - too new
{
Undecodable();
}
}
return(inRange);
}
internal void ReturnFecPacket(RtpPacketFec packet)
{
Debug.Assert(packet != null);
packet.Reset();
fecPool.Push(packet);
}
internal void SendPacketFec(RtpPacketFec packet)
{
packet.Sequence = fecSeq++;
packet.DataRangeMin = dataRangeMin;
packet.PacketsInFrame = cDataPx;
packet.SSRC = SSRC;
packet.FecIndex = checksumFecIndex++;
rtpNetworkSender.Send((BufferChunk)packet);
fecPackets++;
fecBytes += packet.PayloadSize;
}
/// <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);
}
}
}
}
// Check to see if packet is inside the recovery range
protected bool InRangeFec(RtpPacketFec packet)
{
bool inRange = true;
if(rangeInitialized)
{
ushort minDiff = unchecked((ushort)(packet.DataRangeMin - minSeq));
// Correct data range but not needed - late (frame already complete)
// OR Wrong data range - really late
if((minDiff == 0 && (dataPxAct + fecPxAct == 0)) || minDiff > HALF_USHORT_MAX)
{
inRange = false;
pcFecPacketsLate++;
ReturnFecBuffer(packet.ReleaseBuffer());
}
else if(minDiff != 0) // Wrong data range - too new
{
Undecodable();
}
}
return inRange;
}
private void ProcessPacketFec(RtpPacketFec packet)
{
pcFecPacketsLost += LostPackets(ref maxFecSeq, packet.Sequence);
pcFecPackets++;
pcFecBytes += packet.PayloadSize;
if(InRangeFec(packet))
{
// New sequence of packets
if(dataPxAct + fecPxAct == 0)
{
ResetDecodingState(packet);
}
int checksumFecIndex = packet.FecIndex;
// Duplicate packet check for flaky networks
if(dataPx[dataPxExp + checksumFecIndex] != null)
{
eventLog.WriteEntry("Duplicate packet received!", EventLogEntryType.Warning,
(int)RtpEL.ID.DuplicatePacketReceived);
return;
}
fecPxAct++;
dataPx[dataPxExp + checksumFecIndex] = packet;
data[dataPxExp + checksumFecIndex] = packet.Payload;
recovery[recoveryIndex++] = getBufferHandler();
}
}
/// <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);
}
}
}
}
