MPEG1or2VideoStreamDiscreteFramer.hh

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// "liveMedia"
// Copyright (c) 1996-2024 Live Networks, Inc.  All rights reserved.
// A simplified version of "MPEG1or2VideoStreamFramer" that takes only
// complete, discrete frames (rather than an arbitrary byte stream) as input.
// This avoids the parsing and data copying overhead of the full
// "MPEG1or2VideoStreamFramer".
// C++ header
 
#ifndef _MPEG1or2_VIDEO_STREAM_DISCRETE_FRAMER_HH
#define _MPEG1or2_VIDEO_STREAM_DISCRETE_FRAMER_HH
 
#ifndef _MPEG1or2_VIDEO_STREAM_FRAMER_HH
#include "MPEG1or2VideoStreamFramer.hh"
#endif
 
#define VSH_MAX_SIZE 1000
 
class MPEG1or2VideoStreamDiscreteFramer: public MPEG1or2VideoStreamFramer {
public:
  static MPEG1or2VideoStreamDiscreteFramer*
  createNew(UsageEnvironment& env, FramedSource* inputSource,
            Boolean iFramesOnly = False, // see MPEG1or2VideoStreamFramer.hh
            double vshPeriod = 5.0, // see MPEG1or2VideoStreamFramer.hh
            Boolean leavePresentationTimesUnmodified = False);
 
protected:
  MPEG1or2VideoStreamDiscreteFramer(UsageEnvironment& env,
                                    FramedSource* inputSource,
                                    Boolean iFramesOnly, double vshPeriod, Boolean leavePresentationTimesUnmodified);
  // called only by createNew()
  virtual ~MPEG1or2VideoStreamDiscreteFramer();
 
protected:
  // redefined virtual functions:
  virtual void doGetNextFrame();
 
protected:
  static void afterGettingFrame(void* clientData, unsigned frameSize,
                                unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned frameSize,
                          unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);
 
protected:
  Boolean fLeavePresentationTimesUnmodified;
  struct timeval fLastNonBFramePresentationTime;
  unsigned fLastNonBFrameTemporal_reference;
 
  // A saved copy of the most recently seen 'video_sequence_header',
  // in case we need to insert it into the stream periodically:
  unsigned char fSavedVSHBuffer[VSH_MAX_SIZE];
  unsigned fSavedVSHSize;
  double fSavedVSHTimestamp;
  Boolean fIFramesOnly;
  double fVSHPeriod;
};
 
#endif