public static List <T> CreateAllFromPackets <T>(List <MPEGTransportStreamPacket> packets, long PID, int tableId) where T : DVBTTable, new()
{
var res = new List <T>();
var filteredPackets = MPEGTransportStreamPacket.GetAllPacketsPayloadBytesByPID(packets, PID);
foreach (var kvp in filteredPackets)
{
var t = new T();
try
{
t.Parse(kvp.Value);
if (t.CRCIsValid())
{
if (t.ID == tableId)
{
res.Add(t);
}
else
{
// not SDT table
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
return(res);
}
public EITScanResult Scan(List <byte> bytes)
{
if (bytes == null || bytes.Count == 0)
{
return(new EITScanResult()
{
OK = false
});
}
var packets = MPEGTransportStreamPacket.Parse(bytes);
return(Scan(packets));
}
public static T CreateFromPackets <T>(List <MPEGTransportStreamPacket> packets, long PID) where T : DVBTTable, new()
{
var filteredPackets = MPEGTransportStreamPacket.GetAllPacketsPayloadBytesByPID(packets, PID);
foreach (var kvp in filteredPackets)
{
var t = new T();
try
{
t.Parse(kvp.Value);
if (t.CRCIsValid())
{
return(t);
}
} catch (Exception ex)
{
Console.WriteLine(ex);
}
}
return(null);
}
public static List <MPEGTransportStreamPacket> Parse(List <byte> bytes, int PIDFilter = -1)
{
var pos = FindSyncBytePosition(bytes);
var res = new List <MPEGTransportStreamPacket>();
if (pos == -1)
{
return(res);
}
while (pos + 188 < bytes.Count)
{
var buff = new byte[188];
for (var i = 0; i < 188; i++)
{
buff[i] = bytes[pos + i];
}
var packet = new MPEGTransportStreamPacket();
packet.Parse(buff);
if (
(PIDFilter == -1) // add all packets
||
((PIDFilter != -1) && (packet.PID == PIDFilter))
)
{
res.Add(packet);
}
pos += 188;
}
return(res);
}
/// <summary>
/// Scanning actual and scheduled events for actual TS
/// </summary>
/// <param name="packets"></param>
public EITScanResult Scan(List <MPEGTransportStreamPacket> packets)
{
_log.Debug($"Scanning EIT from packets");
var res = new EITScanResult()
{
OK = true
};
try
{
var eitData = MPEGTransportStreamPacket.GetAllPacketsPayloadBytesByPID(packets, 18);
_log.Debug($"EIT packets count: {eitData.Count}");
var eventIDs = new Dictionary <int, Dictionary <int, EventItem> >(); // ServiceID -> (event id -> event item )
var currentEventsCountFound = 0;
var scheduledEventsCountFound = 0;
foreach (var kvp in eitData)
{
try
{
var eit = DVBTTable.Create <EITTable>(kvp.Value);
if (eit == null || !eit.CRCIsValid())
{
continue;
}
if (eit.ID == 78) // actual TS, present/following event information = table_id = 0x4E;
{
foreach (var item in eit.EventItems)
{
if (item.StartTime < DateTime.Now &&
item.FinishTime > DateTime.Now)
{
// reading only the actual event
// there can be event that start in future!
CurrentEvents[eit.ServiceId] = item;
currentEventsCountFound++;
break;
}
}
}
else
if (eit.ID >= 80 && eit.ID <= 95) // actual TS, event schedule information = table_id = 0x50 to 0x5F;
{
foreach (var item in eit.EventItems)
{
if (!eventIDs.ContainsKey(eit.ServiceId))
{
eventIDs[eit.ServiceId] = new Dictionary <int, EventItem>();
}
var serviceItems = eventIDs[eit.ServiceId];
if (!serviceItems.ContainsKey(item.EventId))
{
serviceItems.Add(item.EventId, item);
scheduledEventsCountFound++;
}
}
}
}
catch (MPEGTSUnsupportedEncodingException)
{
res.UnsupportedEncoding = true;
}
catch (Exception ex)
{
// Bad data EIT data
}
}
_log.Debug($"Scheduled Events found: {scheduledEventsCountFound}");
_log.Debug($"Current Events found: {currentEventsCountFound}");
// transform to List and sorting:
foreach (var kvp in eventIDs)
{
foreach (var eventItem in kvp.Value)
{
AddScheduledEventItem(kvp.Key, eventItem.Value);
}
ScheduledEvents[kvp.Key].Sort();
}
var psiTable = DVBTTable.CreateFromPackets <PSITable>(packets, 0);
if (psiTable != null && psiTable.ProgramAssociations != null)
{
foreach (var kvp in psiTable.ProgramAssociations)
{
_log.Debug($"Associate program number {kvp.ProgramNumber} to PID {kvp.ProgramMapPID}");
ProgramNumberToMapPID[kvp.ProgramNumber] = kvp.ProgramMapPID;
}
}
else
{
_log.Debug($"No PSI table found");
}
} catch (Exception e)
{
_log.Error(e);
res.OK = false;
}
return(res);
}
