public override void ProcessTsPacket(TsPacketMetadata tsPacketMetadata, byte[] packetBuffer, Int64 packetOffsetInBuffer)
{
Result result = new Result();
//Int64 dataLeftInBit = (Int64)tsPacketMetadata.PacketSize;
Int64 dataLeftInBit = (Int64)TsPacketSize.SIZE_188 * 8; //Important!!!!No matter 188 or 204 bytes, the valid data will always be 188 bytes.16 bytes are checksum that is not useful for parsing.
Int64 bitOffset = packetOffsetInBuffer * 8; //Key point to set the beginning offset!!!!!
if (result.Fine)
{
//8-bit sync_byte.
result = Utility.ByteArraySkipBits(ref dataLeftInBit, ref bitOffset, 8);
}
if (result.Fine)
{
//1-bit transport_error_indicator.
result = Utility.ByteArraySkipBits(ref dataLeftInBit, ref bitOffset, 1);
}
Int64 payloadUnitStartIndicator = 0;
if (result.Fine)
{
//1-bit payload_unit_start_indicator.
result = Utility.ByteArrayReadBits(packetBuffer, ref dataLeftInBit, ref bitOffset, 1, ref payloadUnitStartIndicator);
//GetContext().WriteLog(Utility.GetValueBinaryString(fieldValue, 1) + Environment.NewLine);
}
if (result.Fine)
{
//1-bit transport_priority.
result = Utility.ByteArraySkipBits(ref dataLeftInBit, ref bitOffset, 1);
}
Int64 pid = 0;
if (result.Fine)
{
//13-bit PID.
result = Utility.ByteArrayReadBits(packetBuffer, ref dataLeftInBit, ref bitOffset, 13, ref pid);
//GetContext().WriteLog(Utility.GetValueBinaryString(fieldValue, 13) + Environment.NewLine);
}
//To update the PID according to the request.
if (result.Fine)
{
PidUpdate pidUpdate = null;
//If this pid needs update.
if (pidUpdateList.TryGetValue((UInt16)pid, out pidUpdate))
{
//To update the PID.
packetBuffer[packetOffsetInBuffer + 1] = (byte)((packetBuffer[packetOffsetInBuffer + 1] & (byte)0xE0) | (pidUpdate.NewPid >> 8)); //To update the high 5 bits of PID.
packetBuffer[packetOffsetInBuffer + 2] = (byte)(pidUpdate.NewPid & 0xFF); //To update the low 8 bits of PID.
//Write to output file now.
outputFileStream.Write(packetBuffer, (int)packetOffsetInBuffer, (int)tsPacketMetadata.PacketSize);
}
else
{
//Write the original packet directly.
outputFileStream.Write(packetBuffer, (int)packetOffsetInBuffer, (int)tsPacketMetadata.PacketSize);
}
}
}
public override void ProcessTsPacket(TsPacketMetadata tsPacketMetadata, byte[] packetBuffer, Int64 packetOffsetInBuffer)
{
Result result = new Result();
//Int64 dataLeftInBit = (Int64)tsPacketMetadata.PacketSize;
Int64 dataLeftInBit = (Int64)TsPacketSize.SIZE_188 * 8; //Important!!!!No matter 188 or 204 bytes, the valid data will always be 188 bytes.16 bytes are checksum that is not useful for parsing.
Int64 bitOffset = packetOffsetInBuffer * 8; //Key point to set the beginning offset!!!!!
if (result.Fine)
{
//8-bit sync_byte.
result = Utility.ByteArraySkipBits(ref dataLeftInBit, ref bitOffset, 8);
}
if (result.Fine)
{
//1-bit transport_error_indicator.
result = Utility.ByteArraySkipBits(ref dataLeftInBit, ref bitOffset, 1);
}
Int64 payloadUnitStartIndicator = 0;
if (result.Fine)
{
//1-bit payload_unit_start_indicator.
result = Utility.ByteArrayReadBits(packetBuffer, ref dataLeftInBit, ref bitOffset, 1, ref payloadUnitStartIndicator);
//GetContext().WriteLog(Utility.GetValueBinaryString(fieldValue, 1) + Environment.NewLine);
}
if (result.Fine)
{
//1-bit transport_priority.
result = Utility.ByteArraySkipBits(ref dataLeftInBit, ref bitOffset, 1);
}
Int64 pid = 0;
if (result.Fine)
{
//13-bit PID.
result = Utility.ByteArrayReadBits(packetBuffer, ref dataLeftInBit, ref bitOffset, 13, ref pid);
//GetContext().WriteLog(Utility.GetValueBinaryString(fieldValue, 13) + Environment.NewLine);
}
Int64 scrambled = 0;
if (result.Fine)
{
//1-bit scrambling indicator. If 1, scrambled, else clear.
result = Utility.ByteArrayReadBits(packetBuffer, ref dataLeftInBit, ref bitOffset, 1, ref scrambled);
}
Int64 evenOdd = 0;
if (result.Fine)
{
//1-bit even/odd indicator.
result = Utility.ByteArrayReadBits(packetBuffer, ref dataLeftInBit, ref bitOffset, 1, ref evenOdd);
}
if ((totalLengthOfDataParsed - previousTotalLengthOfDataParsed) * 8 >= (muxBitrate * cwPeriod))//Need to do a CW cycle.
{
//To switch the CW.
//Get the control word.
int realControlWordId = currentControlWord;
currentControlWord++; //Increase so that we can pick up next control word.
realControlWordId = realControlWordId % controlWordCount; //We like to loop back if necessary.
byte[] csaKey = new byte[8];
Array.Copy(controlWordSerials, realControlWordId * 8, csaKey, 0, 8);//Copy the key into a new buffer.
//Set the CW.
csaDescrambler.SetCW(csaKey, doEntropy);
//Switch even/odd flag.
evenOddFlag = (evenOddFlag + 1) % 2;
//Save the new value as the previous one.
previousTotalLengthOfDataParsed = totalLengthOfDataParsed;
}
//To process the PID according to the request.
if (result.Fine)
{
PidUpdate pidToProcess = null;
//If this pid needs to be extracted.
if (pidUpdateList.TryGetValue((UInt16)pid, out pidToProcess))
{
//Scramble the packet in place.
csaDescrambler.EncryptTSPacket(packetBuffer, (int)packetOffsetInBuffer, (int)TsPacketSize.SIZE_188, evenOddFlag);
}
//Write the output no matter clear or descrambled.
outputFileStream.Write(packetBuffer, (int)packetOffsetInBuffer, (int)tsPacketMetadata.PacketSize);
}
}
