public Packet(byte[] packetBuffer)
{
TransportErrorIndicator = 1 == packetBuffer[1] >> 7; // Set by demodulator if can't correct errors in the stream, to tell the demultiplexer that the packet has an uncorrectable error
PayloadUnitStartIndicator = 1 == ((packetBuffer[1] & 64) >> 6); // and with 01000000 to get second byte - 1 means start of PES data or PSI otherwise zero
TransportPriority = 1 == ((packetBuffer[1] & 32) >> 5); // and with 00100000 to get third byte - 1 means higher priority than other packets with the same PID
PacketId = (packetBuffer[1] & 31) * 256 + packetBuffer[2]; // and with 00011111 to get last 5 bytes
ScramblingControl = packetBuffer[3] >> 6; // '00' = Not scrambled. The following per DVB spec:[12] '01' = Reserved for future use, '10' = Scrambled with even key, '11' = Scrambled with odd key
AdaptationFieldControl = (packetBuffer[3] & 48) >> 4; // and with 00110000, 01 = no adaptation fields (payload only), 10 = adaptation field only, 11 = adaptation field and payload
ContinuityCounter = packetBuffer[3] & 15;
AdaptionFieldLength = AdaptationFieldControl > 1 ? (0xFF & packetBuffer[4]) + 1 : 0;
if (AdaptationFieldControl == Helper.B00000010 || AdaptationFieldControl == Helper.B00000011)
{
AdaptationField = new AdaptationField(packetBuffer);
}
if (AdaptationFieldControl == Helper.B00000001 || AdaptationFieldControl == Helper.B00000011) // Payload exists - binary '01' || '11'
{
int payloadStart = 4;
if (AdaptationField != null)
{
payloadStart += (1 + AdaptationField.Length);
}
if (PacketId == ProgramAssociationTablePacketId) // PAT = Program Association Table: lists all programs available in the transport stream.
{
ProgramAssociationTable = new ProgramAssociationTable(packetBuffer, payloadStart + 1); // TODO: What index?
}
// Save payload
Payload = new byte[packetBuffer.Length - payloadStart];
Buffer.BlockCopy(packetBuffer, payloadStart, Payload, 0, Payload.Length);
}
}
public Packet(byte[] packetBuffer)
{
TransportErrorIndicator = 1 == packetBuffer[1] >> 7; // Set by demodulator if can't correct errors in the stream, to tell the demultiplexer that the packet has an uncorrectable error
PayloadUnitStartIndicator = 1 == ((packetBuffer[1] & 64) >> 6); // and with 01000000 to get second byte - 1 means start of PES data or PSI otherwise zero
TransportPriority = 1 == ((packetBuffer[1] & 32) >> 5); // and with 00100000 to get third byte - 1 means higher priority than other packets with the same PID
PacketId = (packetBuffer[1] & 31) * 256 + packetBuffer[2];// and with 00011111 to get last 5 bytes
ScramblingControl = packetBuffer[3] >> 6; // '00' = Not scrambled. The following per DVB spec:[12] '01' = Reserved for future use, '10' = Scrambled with even key, '11' = Scrambled with odd key
AdaptationFieldControl = (packetBuffer[3] & 48) >> 4; // and with 00110000, 01 = no adaptation fields (payload only), 10 = adaptation field only, 11 = adaptation field and payload
ContinuityCounter = packetBuffer[3] & 15;
AdaptionFieldLength = AdaptationFieldControl > 1 ? (0xFF & packetBuffer[4]) + 1 : 0;
if (AdaptationFieldControl == Helper.B00000010 || AdaptationFieldControl == Helper.B00000011)
AdaptationField = new AdaptationField(packetBuffer);
if (AdaptationFieldControl == Helper.B00000001 || AdaptationFieldControl == Helper.B00000011) // Payload exists - binary '01' || '11'
{
int payloadStart = 4;
if (AdaptationField != null)
payloadStart += (1 + AdaptationField.Length);
if (PacketId == ProgramAssociationTablePacketId) // PAT = Program Association Table: lists all programs available in the transport stream.
{
ProgramAssociationTable = new ProgramAssociationTable(packetBuffer, payloadStart + 1); // TODO: What index?
}
// Save payload
Payload = new byte[packetBuffer.Length - payloadStart];
Buffer.BlockCopy(packetBuffer, payloadStart, Payload, 0, Payload.Length);
}
}
/// <summary>
/// Get Program Map Tables for a Transport Stream, especially language for subtitle tracks
/// </summary>
/// <param name="ms">Input stream</param>
public void Parse(Stream ms)
{
try
{
ms.Position = 0;
const int packetLength = 188;
var isM2TransportStream = TransportStreamParser.IsM3TransportStream(ms);
var packetBuffer = new byte[packetLength];
var m2TsTimeCodeBuffer = new byte[4];
long position = 0;
// check for Topfield .rec file
ms.Seek(position, SeekOrigin.Begin);
ms.Read(m2TsTimeCodeBuffer, 0, 3);
if (m2TsTimeCodeBuffer[0] == 0x54 && m2TsTimeCodeBuffer[1] == 0x46 && m2TsTimeCodeBuffer[2] == 0x72)
{
position = 3760;
}
var pmtPids = new List <int>();
_programMapTables = new List <ProgramMapTable>();
long transportStreamLength = ms.Length;
var max = Math.Min(transportStreamLength, MaxScanSize + position);
while (position < max)
{
ms.Seek(position, SeekOrigin.Begin);
if (isM2TransportStream)
{
ms.Read(m2TsTimeCodeBuffer, 0, m2TsTimeCodeBuffer.Length);
position += m2TsTimeCodeBuffer.Length;
}
ms.Read(packetBuffer, 0, packetLength);
if (packetBuffer[0] == Packet.SynchronizationByte)
{
var packet = new Packet(packetBuffer);
if (pmtPids.Contains(packet.PacketId))
{
var pmt = new ProgramMapTable(packet.Payload, 0);
_programMapTables.Add(pmt);
}
else if (packet.IsProgramAssociationTable)
{
var pat = new ProgramAssociationTable(packet.Payload, 0);
pmtPids.AddRange(pat.ProgramIds.Where(p => !pmtPids.Contains(p)));
}
position += packetLength;
}
else
{
position++;
}
}
}
catch (Exception e)
{
Exception = e;
}
}