MPEG2TransportStreamFramer.hh

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/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
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This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
more details.
 
You should have received a copy of the GNU Lesser General Public License
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// "liveMedia"
// Copyright (c) 1996-2024 Live Networks, Inc.  All rights reserved.
// A filter that passes through (unchanged) chunks that contain an integral number
// of MPEG-2 Transport Stream packets, but returning (in "fDurationInMicroseconds")
// an updated estimate of the time gap between chunks.
// C++ header
 
#ifndef _MPEG2_TRANSPORT_STREAM_FRAMER_HH
#define _MPEG2_TRANSPORT_STREAM_FRAMER_HH
 
#ifndef _FRAMED_FILTER_HH
#include "FramedFilter.hh"
#endif
 
#ifndef _HASH_TABLE_HH
#include "HashTable.hh"
#endif
 
class MPEG2TransportStreamFramer: public FramedFilter {
public:
  static MPEG2TransportStreamFramer*
  createNew(UsageEnvironment& env, FramedSource* inputSource);
 
  u_int64_t tsPacketCount() const { return fTSPacketCount; }
 
  void changeInputSource(FramedSource* newInputSource) { fInputSource = newInputSource; }
 
  void clearPIDStatusTable();
  void setNumTSPacketsToStream(unsigned long numTSRecordsToStream);
  void setPCRLimit(float pcrLimit);
 
protected:
  MPEG2TransportStreamFramer(UsageEnvironment& env, FramedSource* inputSource);
      // called only by createNew()
  virtual ~MPEG2TransportStreamFramer();
 
private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();
  virtual void doStopGettingFrames();
 
private:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          struct timeval presentationTime);
 
  Boolean updateTSPacketDurationEstimate(unsigned char* pkt, double timeNow);
 
private:
  u_int64_t fTSPacketCount;
  double fTSPacketDurationEstimate;
  HashTable* fPIDStatusTable;
  u_int64_t fTSPCRCount;
  Boolean fLimitNumTSPacketsToStream;
  unsigned long fNumTSPacketsToStream; // used iff "fLimitNumTSPacketsToStream" is True
  Boolean fLimitTSPacketsToStreamByPCR;
  float fPCRLimit; // used iff "fLimitTSPacketsToStreamByPCR" is True
};
 
#endif