MP3AudioFileServerMediaSubsession.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.
 
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// "liveMedia"
// Copyright (c) 1996-2022 Live Networks, Inc.  All rights reserved.
// A 'ServerMediaSubsession' object that creates new, unicast, "RTPSink"s
// on demand, from an MP3 audio file.
// (Actually, any MPEG-1 or MPEG-2 audio file should work.)
// C++ header
 
#ifndef _MP3_AUDIO_FILE_SERVER_MEDIA_SUBSESSION_HH
#define _MP3_AUDIO_FILE_SERVER_MEDIA_SUBSESSION_HH
 
#ifndef _FILE_SERVER_MEDIA_SUBSESSION_HH
#include "FileServerMediaSubsession.hh"
#endif
#ifndef _MP3_ADU_INTERLEAVING_HH
#include "MP3ADUinterleaving.hh"
#endif
#ifndef _MP3_ADU_HH
#include "MP3ADU.hh"
#endif
 
class MP3AudioFileServerMediaSubsession: public FileServerMediaSubsession{
public:
  static MP3AudioFileServerMediaSubsession*
  createNew(UsageEnvironment& env, char const* fileName, Boolean reuseFirstSource,
            Boolean generateADUs, Interleaving* interleaving);
      // Note: "interleaving" is used only if "generateADUs" is True,
      // (and a value of NULL means 'no interleaving')
 
protected:
  MP3AudioFileServerMediaSubsession(UsageEnvironment& env,
                                    char const* fileName, Boolean reuseFirstSource,
                                    Boolean generateADUs,
                                    Interleaving* interleaving);
      // called only by createNew();
  virtual ~MP3AudioFileServerMediaSubsession();
 
  FramedSource* createNewStreamSourceCommon(FramedSource* baseMP3Source, unsigned mp3NumBytes, unsigned& estBitrate);
  void getBaseStreams(FramedSource* frontStream,
                      FramedSource*& sourceMP3Stream, ADUFromMP3Source*& aduStream/*if any*/);
 
protected: // redefined virtual functions
  virtual void seekStreamSource(FramedSource* inputSource, double& seekNPT, double streamDuration, u_int64_t& numBytes);
  virtual void setStreamSourceScale(FramedSource* inputSource, float scale);
  virtual FramedSource* createNewStreamSource(unsigned clientSessionId,
                                              unsigned& estBitrate);
  virtual RTPSink* createNewRTPSink(Groupsock* rtpGroupsock,
                                    unsigned char rtpPayloadTypeIfDynamic,
                                    FramedSource* inputSource);
  virtual void testScaleFactor(float& scale);
  virtual float duration() const;
 
protected:
  Boolean fGenerateADUs;
  Interleaving* fInterleaving;
  float fFileDuration;
};
 
#endif