private void BuildBasicReceiverTables(VenueState venueState, out DataTable thptTable, out DataTable lossTable,
IDictionary <IPEndPoint, SenderData> senderSummaries)
{
thptTable = new DataTable();
lossTable = new DataTable();
thptTable.Columns.Add("Receiver IP", Type.GetType("System.String"));
thptTable.Columns.Add("CName", Type.GetType("System.String"));
lossTable.Columns.Add("Receiver IP", Type.GetType("System.String"));
lossTable.Columns.Add("CName", Type.GetType("System.String"));
// add a column for each sender...
foreach (IPEndPoint endPoint in senderSummaries.Keys)
{
thptTable.Columns.Add(endPoint.ToString(), Type.GetType("System.String"));
lossTable.Columns.Add(endPoint.ToString(), Type.GetType("System.String"));
}
lock (venueState.ReceiverData)
{
// add a row for each receiver
foreach (IPEndPoint receiverEndpoint in getSortedReceivers(venueState))
{
ReceiverData receiverData = venueState.ReceiverData[receiverEndpoint];
if (receiverData == null)
{
continue; // shouldn't happen...
}
// process receiver summaries
ICollection <ReceiverSummary> summaries = receiverData.ReceiverSummaries;
if (summaries == null || summaries.Count == 0)
{
continue;
}
DataRow thptRow = thptTable.NewRow();
DataRow lossRow = lossTable.NewRow();
thptRow["Receiver IP"] = receiverEndpoint.ToString();
thptRow["CName"] = receiverData.CName;
lossRow["Receiver IP"] = receiverEndpoint.ToString();
lossRow["CName"] = receiverData.CName;
// initialize sender columns...
foreach (IPEndPoint endPoint in senderSummaries.Keys)
{
lossRow[endPoint.ToString()] = "no data";
thptRow[endPoint.ToString()] = "no data";
}
// process receiver summaries, while merging data from co-located data streams
// thus, we should end up with one column per sending host, regardless of its
// number of output streams...
IDictionary <IPEndPoint, ReceiverSummary> mergedReceiverSummaries =
new Dictionary <IPEndPoint, ReceiverSummary>();
// this is the merge phase...
foreach (ReceiverSummary summary in summaries)
{
SenderData senderData;
if (!venueState.SenderData.TryGetValue(summary.SSRC, out senderData))
{
continue; // no sender data for this receiver summary
}
IPEndPoint senderEndpoint = senderData.Source;
if (senderEndpoint == null)
{
continue;
}
if (mergedReceiverSummaries.ContainsKey(senderEndpoint))
{
// merge the summary data with existing data from this sender
ReceiverSummary existingSummary = mergedReceiverSummaries[senderEndpoint];
ReceiverSummary updatedSummary = new ReceiverSummary(existingSummary, summary);
mergedReceiverSummaries[senderEndpoint] = updatedSummary;
}
else
{
// otherwise, create a new summary entry for this EndPoint
mergedReceiverSummaries[senderEndpoint] = summary;
}
}
// At this point, we have merged data from co-located data streams. Populate
// the columns corresponding to source IP addreses.
foreach (IPEndPoint senderEndpoint in mergedReceiverSummaries.Keys)
{
if (thptTable.Columns.Contains(senderEndpoint.ToString()))
{
ReceiverSummary summary = mergedReceiverSummaries[senderEndpoint];
SenderData senderData = senderSummaries[senderEndpoint];
double throughputDifferential = summary.PacketRate - senderData.PacketRate;
try
{
thptRow[senderEndpoint.ToString()] = String.Format("{0:N} pk/sec", throughputDifferential);
//String.Format("{1:N} - {2:N} = {0:N} pk/sec", throughputDifferential,
//summary.PacketRate , senderData.PacketRate);
lossRow[senderEndpoint.ToString()] = String.Format("{0:P}", summary.LossRate);
}
catch (Exception)
{
// these operations can fail when sender and receiver tables are out of sync
}
}
}
// mark "loopback" data as such
try
{
thptRow[receiverEndpoint.ToString()] = "loopback";
lossRow[receiverEndpoint.ToString()] = "loopback";
}
catch (Exception)
{
// these operations can fail if sender, receiver tables are out of sync...
}
thptTable.Rows.Add(thptRow);
lossTable.Rows.Add(lossRow);
} // for each receiver in the venue
} // venue.receiverData lock
}
private void BuildAdvancedReceiverTables(VenueState venueState, out DataTable thptTable, out DataTable lossTable)
{
thptTable = new DataTable();
lossTable = new DataTable();
thptTable.Columns.Add("Receiver IP", Type.GetType("System.String"));
thptTable.Columns.Add("CName", Type.GetType("System.String"));
lossTable.Columns.Add("Receiver IP", Type.GetType("System.String"));
lossTable.Columns.Add("CName", Type.GetType("System.String"));
// keep track of the packet sending rate for each sender; this avoids having
// to hold multiple locks at the same time...
IDictionary <uint, double> sendingRateMap = new Dictionary <uint, double>();
lock (venueState.SenderData)
{
// add a column for each sender... Keep the key set sorted so that elements don't
// bounce around between rows
foreach (uint ssrc in getSortedSenders(venueState))
{
thptTable.Columns.Add(ssrc.ToString(), Type.GetType("System.String"));
lossTable.Columns.Add(ssrc.ToString(), Type.GetType("System.String"));
sendingRateMap[ssrc] = venueState.SenderData[ssrc].PacketRate;
}
}
lock (venueState.ReceiverData)
{
// add a row for each receiver
foreach (IPEndPoint endPoint in getSortedReceivers(venueState))
{
ReceiverData receiverData = venueState.ReceiverData[endPoint];
if (receiverData == null)
{
continue; // shouldn't happen...
}
// process receiver summaries
ICollection <ReceiverSummary> summaries = receiverData.ReceiverSummaries;
if (summaries == null || summaries.Count == 0)
{
continue;
}
DataRow thptRow = thptTable.NewRow();
DataRow lossRow = lossTable.NewRow();
thptRow["Receiver IP"] = endPoint.ToString();
thptRow["CName"] = receiverData.CName;
lossRow["Receiver IP"] = endPoint.ToString();
lossRow["CName"] = receiverData.CName;
// initialize sender columns...
foreach (uint ssrc in getSortedSenders(venueState))
{
lossRow[ssrc.ToString()] = "no data";
thptRow[ssrc.ToString()] = "no data";
}
// process receiver summaries
//ICollection<ReceiverSummary> summaries = hostState.ReceiverSummaries;
foreach (ReceiverSummary summary in summaries)
{
uint reporteeSSRC = summary.SSRC;
if (thptTable.Columns.Contains(reporteeSSRC.ToString()))
{
double throughputDifferential = summary.PacketRate - sendingRateMap[reporteeSSRC];
thptRow[reporteeSSRC.ToString()] = String.Format("{0:N} pk/sec", throughputDifferential);
lossRow[reporteeSSRC.ToString()] = String.Format("{0:P}", summary.LossRate);
}
} // for each receiver summary...
thptTable.Rows.Add(thptRow);
lossTable.Rows.Add(lossRow);
} // for each receiver in the venue
} // venue.receiverData lock
}
private void Start()
{
//BufferChunk chunk = new BufferChunk(2048);
CompoundPacket compoundPacket = new CompoundPacket();
EndPoint endPoint = null;
while (isRunning)
{
try
{
compoundPacket.Reset();
udpListener.ReceiveFrom(compoundPacket.Buffer, out endPoint);
compoundPacket.ParseBuffer();
//IPAddress ipAddress = ((IPEndPoint)endPoint).Address;
IPEndPoint ipEndpoint = (IPEndPoint)endPoint;
// The compound packet enumerator destroys its list during enumeration,
// so we keep track of packets that have yet to be processed
IList <RtcpPacket> yetToBeProcessed = new List <RtcpPacket>();
String venueName = null;
//uint ssrc = 0;
long when = 0; // in units of "ticks"
// scan through the compound packet, looking for key pieces of meta-data
// first, look for the app packet that specifies the venue
// also, obtain the ssrc and the time stamp
foreach (RtcpPacket packet in compoundPacket)
{
if (packet.PacketType == (byte)Rtcp.PacketType.APP)
{
AppPacket appPacket = new AppPacket(packet);
if (appPacket.Name.Equals(Rtcp.APP_PACKET_NAME) &&
appPacket.Subtype == Rtcp.VENUE_APP_PACKET_SUBTYPE)
{
BufferChunk chunk = new BufferChunk(appPacket.Data);
when = chunk.NextInt64();
venueName = chunk.NextUtf8String(chunk.Length);
int padIndex = venueName.IndexOf((char)0);
if (padIndex > 0)
{
venueName = venueName.Substring(0, padIndex);
}
}
}
else
{
yetToBeProcessed.Add(packet);
}
}
if (venueName == null)
{
continue; // can't do anything if we don't know the venue for this packet
}
if (when == 0)
{
continue; // need a timestamp
}
VenueState venueState = null;
// compound operations must always be locked...
lock (venueStateMap)
{
if (!venueStateMap.ContainsKey(venueName))
{
venueState = new VenueState(venueName);
}
else
{
venueState = venueStateMap[venueName];
}
}
// scan again, this time processing the RTCP packets
foreach (RtcpPacket packet in yetToBeProcessed)
{
switch (packet.PacketType)
{
case (byte)Rtcp.PacketType.SR:
{
SrPacket sr = new SrPacket(packet);
SenderData senderData = venueState.GetSenderState(sr.SSRC);
senderData.Source = ipEndpoint;
senderData.updateSenderState(sr.SenderReport, when);
// this "refreshes" the host state (so that it won't expire)
venueState.SenderData[sr.SSRC] = senderData;
break;
}
case (byte)Rtcp.PacketType.RR:
{
RrPacket rr = new RrPacket(packet);
ReceiverData receiverData = venueState.GetReceiverData(ipEndpoint);
// currently, we replace all receiver summaries with the data
// from a single RR packet
receiverData.updateReceiverState(rr.ReceiverReports, when, venueState);
// this "refreshes" the host state (so that it won't expire)
venueState.ReceiverData[ipEndpoint] = receiverData;
break;
}
case (byte)Rtcp.PacketType.SDES:
{
SdesPacket sdp = new SdesPacket(packet);
foreach (SdesReport report in sdp.Reports())
{
SenderData senderData = venueState.GetSenderState(report.SSRC);
senderData.CName = report.SdesData.CName;
senderData.Source = ipEndpoint;
// this "refreshes" the host state (so that it won't expire)
venueState.SenderData[report.SSRC] = senderData;
ReceiverData receiverData =
venueState.GetReceiverDataWithoutCreating(ipEndpoint);
if (receiverData != null)
{
receiverData.CName = report.SdesData.CName;
}
}
break;
}
case (byte)Rtcp.PacketType.BYE:
{
//BYE packets occur when capabilities stop. Clean out sender data only for the
//ssrc's affected. We leave receiver reports alone for now.
ByePacket byePacket = new ByePacket(packet);
foreach (uint ssrc in byePacket.SSRCs)
{
venueState.SenderData.Remove(ssrc);
}
//Set a flag to cause the matrix for this venue to be rebuilt on the next request.
venueState.ParticipantChange = true;
continue;
}
case (byte)Rtcp.PacketType.APP:
{
// ignored
break;
}
}
} // foreach packet...
// refresh the venue state
venueStateMap[venueName] = venueState;
}
catch (Exception e)
{
Console.Out.WriteLine("Exception : " + e.ToString());
writeEventLog("Exception in receive thread: " + e.ToString(), EventLogEntryType.Warning);
}
} // loop forever...
}