liveMedia/include/MPEG2TransportStreamMultiplexor.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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option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)

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
along with this library; if not, write to the Free Software Foundation, Inc.,
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**********/
// "liveMedia"
// Copyright (c) 1996-2008 Live Networks, Inc.  All rights reserved.
// A class for generating MPEG-2 Transport Stream from one or more input
// Elementary Stream data sources
// C++ header

#ifndef _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH
#define _MPEG2_TRANSPORT_STREAM_MULTIPLEXOR_HH

#ifndef _FRAMED_SOURCE_HH
#include "FramedSource.hh"
#endif
#ifndef _MPEG_1OR2_DEMUX_HH
#include "MPEG1or2Demux.hh" // for SCR
#endif

#define PID_TABLE_SIZE 256

class MPEG2TransportStreamMultiplexor: public FramedSource {
protected:
  MPEG2TransportStreamMultiplexor(UsageEnvironment& env);
  virtual ~MPEG2TransportStreamMultiplexor();

  virtual void awaitNewBuffer(unsigned char* oldBuffer) = 0;
      // implemented by subclasses

  void handleNewBuffer(unsigned char* buffer, unsigned bufferSize,
                       int mpegVersion, MPEG1or2Demux::SCR scr);
  // called by "awaitNewBuffer()"

private:
  // Redefined virtual functions:
  virtual void doGetNextFrame();

private:
  void deliverDataToClient(u_int8_t pid, unsigned char* buffer, unsigned bufferSize,
                           unsigned& startPositionInBuffer);

  void deliverPATPacket();
  void deliverPMTPacket(Boolean hasChanged);

  void setProgramStreamMap(unsigned frameSize);

protected:
  Boolean fHaveVideoStreams;

private:
  unsigned fOutgoingPacketCounter;
  unsigned fProgramMapVersion;
  u_int8_t fPreviousInputProgramMapVersion, fCurrentInputProgramMapVersion;
      // These two fields are used if we see "program_stream_map"s in the input.
  struct {
    unsigned counter;
    u_int8_t streamType; // for use in Program Maps
  } fPIDState[PID_TABLE_SIZE];
  u_int8_t fPCR_PID, fCurrentPID;
      // Note: We map 8-bit stream_ids directly to PIDs
  MPEG1or2Demux::SCR fPCR;
  unsigned char* fInputBuffer;
  unsigned fInputBufferSize, fInputBufferBytesUsed;
  Boolean fIsFirstAdaptationField;
};

#endif

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