private bool SanityCheck(TSHeader header, byte[] tsPacket)
{
//LogDebug("PesDecoder::OnTsPacket %i", tsPacketCount++);
if (tsPacket == null)
{
ServiceRegistration.Get <ILogger>().Debug("tsPacket null!");
return(false);
}
// Assume that correct pid is passed!
/*if (header.Pid != m_pid)
* {
* ServiceRegistration.Get<ILogger>().Debug("Header Pid is %i, expected %i", header.Pid, m_pid);
* return false;
* }*/
if (header.SyncByte != TS_PACKET_SYNC)
{
ServiceRegistration.Get <ILogger>().Debug("pesdecoder pid:%x sync error", _pid);
return(false);
}
if (header.TransportError)
{
_bStart = false;
_iWritePos = 0;
_iPesLength = 0;
ServiceRegistration.Get <ILogger>().Debug("pesdecoder pid:%x transport error", _pid);
return(false);
}
bool scrambled = (header.TScrambling != 0);
if (scrambled)
{
ServiceRegistration.Get <ILogger>().Debug("pesdecoder scrambled!");
return(false);
}
if (header.AdaptionFieldOnly())
{
ServiceRegistration.Get <ILogger>().Debug("pesdecoder AdaptionFieldOnly!");
return(false);
}
return(true);
}
private bool SanityCheck(TSHeader header, byte[] tsPacket)
{
//LogDebug("PesDecoder::OnTsPacket %i", tsPacketCount++);
if (tsPacket == null)
{
ServiceRegistration.Get<ILogger>().Debug("tsPacket null!");
return false;
}
// Assume that correct pid is passed!
/*if (header.Pid != m_pid)
{
ServiceRegistration.Get<ILogger>().Debug("Header Pid is %i, expected %i", header.Pid, m_pid);
return false;
}*/
if (header.SyncByte != TS_PACKET_SYNC)
{
ServiceRegistration.Get<ILogger>().Debug("pesdecoder pid:%x sync error", _pid);
return false;
}
if (header.TransportError)
{
_bStart = false;
_iWritePos = 0;
_iPesLength = 0;
ServiceRegistration.Get<ILogger>().Debug("pesdecoder pid:%x transport error", _pid);
return false;
}
bool scrambled = (header.TScrambling != 0);
if (scrambled)
{
ServiceRegistration.Get<ILogger>().Debug("pesdecoder scrambled!");
return false;
}
if (header.AdaptionFieldOnly())
{
ServiceRegistration.Get<ILogger>().Debug("pesdecoder AdaptionFieldOnly!");
return false;
}
return true;
}
public void OnTsPacket(byte[] tsPacket, UInt64 presentTime)
{
// ServiceRegistration.Get<ILogger>().Debug("PESDECODER ONTSPACKET");
TSHeader header = new TSHeader(tsPacket);
if (!SanityCheck(header, tsPacket))
{
return;
}
int pos = header.PayLoadStart; // where in the pes packet does the payload data start?
if (header.PayloadUnitStart) // if this header starts a new PES packet
{
//ServiceRegistration.Get<ILogger>().Debug("PESDECODER: PayLoadUnitStart");
_hasPayloadStart = true;
if (tsPacket[pos + 0] == 0 && tsPacket[pos + 1] == 0 && tsPacket[pos + 2] == 1)
{
if (_iStreamId < 0)
{
//if stream id not set yet, get it from this
_iStreamId = tsPacket[pos + 3];
if (_iStreamId < 0)
{
throw new Exception("Stream id less than zero :" + _iStreamId);
}
}
else
{
Assert(_iStreamId == tsPacket[pos + 3], "Stream id changed!"); // stream id should not change!
}
if (_iWritePos != 0)
{
//throw new Exception("Buffer is not empty, but new packet is being received!");
ServiceRegistration.Get <ILogger>().Warn("PESDECODER: Buffer is not empty, but new packet is being received!");
}
_iWritePos = 0;
_iPesHeaderLen = tsPacket[pos + 8] + 9;
if (_pesHeader.Length < _iPesHeaderLen)
{
ServiceRegistration.Get <ILogger>().Error(
"PESDecoder: Reported header length is bigger than header buffer! : {0} vs {1}", _pesHeader.Length,
_iPesHeaderLen);
}
Array.Copy(tsPacket, pos, _pesHeader, 0, _iPesHeaderLen);
//above replaces -> memcpy(m_pesHeader,&tsPacket[pos],m_iPesHeaderLen);
pos += (_iPesHeaderLen);
_bStart = true;
int a = _pesHeader[4];
int b = _pesHeader[5];
_iPesLength = (a << 8) + b - (_iPesHeaderLen - 6); // calculate expected actual payload length
}
}
else if (!_hasPayloadStart)
{
//ServiceRegistration.Get<ILogger>().Debug("PACKET DISCARDED: END OF PACKET FOR WHICH WE DONT HAVE START");
return;
}
if (_iWritePos < 0)
{
ServiceRegistration.Get <ILogger>().Debug("m_iWritePos < 0");
return;
}
if (_iStreamId <= 0)
{
ServiceRegistration.Get <ILogger>().Debug("m_iStreamId <= 0");
return;
}
Assert(pos > 0 && pos < 188, "Pos error : " + pos);
Assert(_iWritePos + 188 - pos <= MAX_PES_PACKET, "About to exceed buffer size!");
// check that the buffer is not overrunning
int bytesToWrite = 188 - pos;
Assert(bytesToWrite < 188, "Bytes to write too big : " + bytesToWrite);
Array.Copy(tsPacket, pos, _pesBuffer, _iWritePos, bytesToWrite);
_iWritePos += bytesToWrite;
if (_iPesLength == _iWritePos) // we have the expected data
{
// ServiceRegistration.Get<ILogger>().Debug("PESDECODER: GOT COMPLETE PACKET");
// assert(cb != null, "cb is null!");
if (_iWritePos > 0 && _cb != null)
{
//ServiceRegistration.Get<ILogger>().Debug("PESDECODER: CALLING CALLBACK");
_cb(_iStreamId, _pesHeader, _iPesHeaderLen, _pesBuffer, _iWritePos, _bStart, presentTime);
_bStart = false;
_iWritePos = 0;
_hasPayloadStart = false;
}
}
}
public void OnTsPacket(byte[] tsPacket, UInt64 presentTime)
{
// ServiceRegistration.Get<ILogger>().Debug("PESDECODER ONTSPACKET");
TSHeader header = new TSHeader(tsPacket);
if (!SanityCheck(header, tsPacket)) return;
int pos = header.PayLoadStart; // where in the pes packet does the payload data start?
if (header.PayloadUnitStart) // if this header starts a new PES packet
{
//ServiceRegistration.Get<ILogger>().Debug("PESDECODER: PayLoadUnitStart");
_hasPayloadStart = true;
if (tsPacket[pos + 0] == 0 && tsPacket[pos + 1] == 0 && tsPacket[pos + 2] == 1)
{
if (_iStreamId < 0)
{
//if stream id not set yet, get it from this
_iStreamId = tsPacket[pos + 3];
if (_iStreamId < 0)
{
throw new Exception("Stream id less than zero :" + _iStreamId);
}
}
else Assert(_iStreamId == tsPacket[pos + 3], "Stream id changed!"); // stream id should not change!
if (_iWritePos != 0)
{
//throw new Exception("Buffer is not empty, but new packet is being received!");
ServiceRegistration.Get<ILogger>().Warn("PESDECODER: Buffer is not empty, but new packet is being received!");
}
_iWritePos = 0;
_iPesHeaderLen = tsPacket[pos + 8] + 9;
if (_pesHeader.Length < _iPesHeaderLen)
{
ServiceRegistration.Get<ILogger>().Error(
"PESDecoder: Reported header length is bigger than header buffer! : {0} vs {1}", _pesHeader.Length,
_iPesHeaderLen);
}
Array.Copy(tsPacket, pos, _pesHeader, 0, _iPesHeaderLen);
//above replaces -> memcpy(m_pesHeader,&tsPacket[pos],m_iPesHeaderLen);
pos += (_iPesHeaderLen);
_bStart = true;
int a = _pesHeader[4];
int b = _pesHeader[5];
_iPesLength = (a << 8) + b - (_iPesHeaderLen - 6); // calculate expected actual payload length
}
}
else if (!_hasPayloadStart)
{
//ServiceRegistration.Get<ILogger>().Debug("PACKET DISCARDED: END OF PACKET FOR WHICH WE DONT HAVE START");
return;
}
if (_iWritePos < 0)
{
ServiceRegistration.Get<ILogger>().Debug("m_iWritePos < 0");
return;
}
if (_iStreamId <= 0)
{
ServiceRegistration.Get<ILogger>().Debug("m_iStreamId <= 0");
return;
}
Assert(pos > 0 && pos < 188, "Pos error : " + pos);
Assert(_iWritePos + 188 - pos <= MAX_PES_PACKET, "About to exceed buffer size!");
// check that the buffer is not overrunning
int bytesToWrite = 188 - pos;
Assert(bytesToWrite < 188, "Bytes to write too big : " + bytesToWrite);
Array.Copy(tsPacket, pos, _pesBuffer, _iWritePos, bytesToWrite);
_iWritePos += bytesToWrite;
if (_iPesLength == _iWritePos) // we have the expected data
{
// ServiceRegistration.Get<ILogger>().Debug("PESDECODER: GOT COMPLETE PACKET");
// assert(cb != null, "cb is null!");
if (_iWritePos > 0 && _cb != null)
{
//ServiceRegistration.Get<ILogger>().Debug("PESDECODER: CALLING CALLBACK");
_cb(_iStreamId, _pesHeader, _iPesHeaderLen, _pesBuffer, _iWritePos, _bStart, presentTime);
_bStart = false;
_iWritePos = 0;
_hasPayloadStart = false;
}
}
}
