MPEG4GenericRTPSource.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
Free Software Foundation; either version 3 of the License, or (at your
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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
along with this library; if not, write to the Free Software Foundation, Inc.,
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**********/
// "liveMedia"
// Copyright (c) 1996-2024 Live Networks, Inc.  All rights reserved.
// MPEG4-GENERIC ("audio", "video", or "application") RTP stream sources
// C++ header
 
#ifndef _MPEG4_GENERIC_RTP_SOURCE_HH
#define _MPEG4_GENERIC_RTP_SOURCE_HH
 
#ifndef _MULTI_FRAMED_RTP_SOURCE_HH
#include "MultiFramedRTPSource.hh"
#endif
 
class MPEG4GenericRTPSource: public MultiFramedRTPSource {
public:
  static MPEG4GenericRTPSource*
  createNew(UsageEnvironment& env, Groupsock* RTPgs,
            unsigned char rtpPayloadFormat,
            unsigned rtpTimestampFrequency,
            char const* mediumName,
            char const* mode, unsigned sizeLength, unsigned indexLength,
            unsigned indexDeltaLength
            // add other parameters later
            );
  // mediumName is "audio", "video", or "application"
  // it *cannot* be NULL
 
protected:
  MPEG4GenericRTPSource(UsageEnvironment& env, Groupsock* RTPgs,
                        unsigned char rtpPayloadFormat,
                        unsigned rtpTimestampFrequency,
                        char const* mediumName,
                        char const* mode,
                        unsigned sizeLength, unsigned indexLength,
                        unsigned indexDeltaLength
                        );
      // called only by createNew(), or by subclass constructors
  virtual ~MPEG4GenericRTPSource();
 
protected:
  // redefined virtual functions:
  virtual Boolean processSpecialHeader(BufferedPacket* packet,
                                       unsigned& resultSpecialHeaderSize);
  virtual char const* MIMEtype() const;
 
private:
  char* fMIMEType;
 
  char* fMode;
  unsigned fSizeLength, fIndexLength, fIndexDeltaLength;
  unsigned fNumAUHeaders; // in the most recently read packet
  unsigned fNextAUHeader; // index of the next AU Header to read
  struct AUHeader* fAUHeaders;
 
  friend class MPEG4GenericBufferedPacket;
};
 
 
 
// A function that looks up the sampling frequency from an
// "AudioSpecificConfig" string.  (0 means 'unknown')
unsigned samplingFrequencyFromAudioSpecificConfig(char const* configStr);
 
#endif