text: /**********
  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 2.1 of the License, or (at your
  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.,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  **********/
  // "liveMedia"
  // Copyright (c) 1996-2015 Live Networks, Inc.  All rights reserved.
  // A WAV audio file source
  // NOTE: Samples are returned in little-endian order (the same order in which
  // they were stored in the file).
  // C++ header
  
  #ifndef _WAV_AUDIO_FILE_SOURCE_HH
  #define _WAV_AUDIO_FILE_SOURCE_HH
  
  #ifndef _AUDIO_INPUT_DEVICE_HH
  #include "AudioInputDevice.hh"
  #endif
  
  typedef enum {
    WA_PCM = 0x01,
    WA_PCMA = 0x06,
    WA_PCMU = 0x07,
    WA_IMA_ADPCM = 0x11,
    WA_UNKNOWN
  } WAV_AUDIO_FORMAT;
  
  
  class WAVAudioFileSource: public AudioInputDevice {
  public:
  
    static WAVAudioFileSource* createNew(UsageEnvironment& env,
  					char const* fileName);
  
    unsigned numPCMBytes() const;
    void setScaleFactor(int scale);
    void seekToPCMByte(unsigned byteNumber);
    void limitNumBytesToStream(unsigned numBytesToStream);
        // if "numBytesToStream" is >0, then we limit the stream to that number of bytes, before treating it as EOF
  
    unsigned char getAudioFormat();
  
  protected:
    WAVAudioFileSource(UsageEnvironment& env, FILE* fid);
  	// called only by createNew()
  
    virtual ~WAVAudioFileSource();
  
    static void fileReadableHandler(WAVAudioFileSource* source, int mask);
    void doReadFromFile();
  
  private:
    // redefined virtual functions:
    virtual void doGetNextFrame();
    virtual void doStopGettingFrames();
    virtual Boolean setInputPort(int portIndex);
    virtual double getAverageLevel() const;
  
  protected:
    unsigned fPreferredFrameSize;
  
  private:
    FILE* fFid;
    double fPlayTimePerSample; // useconds
    Boolean fFidIsSeekable;
    unsigned fLastPlayTime; // useconds
    Boolean fHaveStartedReading;
    unsigned fWAVHeaderSize;
    unsigned fFileSize;
    int fScaleFactor;
    Boolean fLimitNumBytesToStream;
    unsigned fNumBytesToStream; // used iff "fLimitNumBytesToStream" is True
    unsigned char fAudioFormat;
  };
  
  #endif
  