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);
}
}