private void getData(ISampleDataProvider dataProvider, AnalysisParameters analysisParameters, BackgroundWorker worker)
{
Logger.Instance.Write("Starting analysis");
analysisParameters.ScanningFrequency.CollectionType = CollectionType.MHEG5;
FrequencyScanner frequencyScanner = new FrequencyScanner(dataProvider, worker);
Collection<TVStation> stations = frequencyScanner.FindTVStations();
pidList = new Collection<PidSpec>();
dataProvider.ChangePidMapping(new int[] { -1 });
IntPtr memoryPointer = dataProvider.BufferAddress;
int currentOffset = 0;
byte[] buffer = new byte[188];
DateTime startTime = DateTime.Now;
int packetCount = 0;
int errorPackets = 0;
int nullPackets = 0;
while ((DateTime.Now - startTime).TotalSeconds < analysisParameters.DataCollectionTimeout && !worker.CancellationPending)
{
if (currentOffset >= dataProvider.BufferSpaceUsed)
{
Thread.Sleep(2000);
if (currentOffset >= dataProvider.BufferSpaceUsed)
{
Logger.Instance.Write("Analysis resetting pid after " + packetCount + " packets (errors = " + errorPackets + " null = " + nullPackets + ")");
dataProvider.ChangePidMapping(new int[] { -1 });
currentOffset = 0;
}
}
else
{
IntPtr currentPointer = new IntPtr(memoryPointer.ToInt64() + currentOffset + 136);
Marshal.Copy(currentPointer, buffer, 0, 188);
packetCount++;
/*if (dumpCount < 10000)
{
Logger.Instance.Dump("atsc " + dumpCount, buffer, buffer.Length);
dumpCount++;
}*/
TransportPacket transportPacket = new TransportPacket();
try
{
transportPacket.Process(buffer);
if (transportPacket.ErrorIndicator)
errorPackets++;
if (transportPacket.IsNullPacket)
nullPackets++;
if (!transportPacket.ErrorIndicator)
{
bool ignorePid = checkPid(transportPacket.PID, stations);
if (!ignorePid)
{
PidSpec pidSpec = findPidSpec(pidList, transportPacket.PID);
if (pidSpec == null)
{
pidSpec = new PidSpec(transportPacket.PID);
addPid(pidList, new PidSpec(transportPacket.PID));
}
pidSpec.ProcessPacket(buffer, transportPacket);
}
}
else
Logger.Instance.Write("Transport packet error in packet " + packetCount);
}
catch (ArgumentOutOfRangeException)
{
Logger.Instance.Write("Failed to parse packet " + packetCount);
}
currentOffset += buffer.Length;
}
}
Logger.Instance.Write("Analysis completed: " + pidList.Count + " PID's loaded from " + packetCount + " packets");
}
private void addPid(Collection<PidSpec> pidList, PidSpec newPID)
{
foreach (PidSpec oldPID in pidList)
{
if (oldPID.Pid == newPID.Pid)
return;
if (oldPID.Pid > newPID.Pid)
{
pidList.Insert(pidList.IndexOf(oldPID), newPID);
return;
}
}
pidList.Add(newPID);
}