MP3ADUTranscoder.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.
// Transcoder for ADUized MP3 frames
// C++ header
 
#ifndef _MP3_ADU_TRANSCODER_HH
#define _MP3_ADU_TRANSCODER_HH
 
#ifndef _FRAMED_FILTER_HH
#include "FramedFilter.hh"
#endif
 
class MP3ADUTranscoder: public FramedFilter {
public:
  static MP3ADUTranscoder* createNew(UsageEnvironment& env,
                                  unsigned outBitrate /* in kbps */,
                                  FramedSource* inputSource);
 
  unsigned outBitrate() const { return fOutBitrate; }
protected:
  MP3ADUTranscoder(UsageEnvironment& env,
                unsigned outBitrate /* in kbps */,
                FramedSource* inputSource);
      // called only by createNew()
  virtual ~MP3ADUTranscoder();
 
private:
  // redefined virtual functions:
  virtual void doGetNextFrame();
  virtual void getAttributes() const;
 
private:
  static void afterGettingFrame(void* clientData,
                                unsigned numBytesRead, unsigned numTruncatedBytes,
                                struct timeval presentationTime,
                                unsigned durationInMicroseconds);
  void afterGettingFrame1(unsigned numBytesRead, unsigned numTruncatedBytes,
                          struct timeval presentationTime,
                          unsigned durationInMicroseconds);
 
private:
  unsigned fOutBitrate; // in kbps
  unsigned fAvailableBytesForBackpointer;
 
  unsigned char* fOrigADU;
      // used to store incoming ADU prior to transcoding
};
 
#endif