audio/include/utilite/UWav.h

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#ifndef UWAV_H
#define UWAV_H

#include "utilite/UtiLiteAudioExp.h" // DLL export/import defines

#include <stdio.h>

class UTILITEAUDIO_EXP UWav
{

public:
        static void writeWavHeader(FILE *fp, unsigned int length, float rate, int channels, int bits);

public:
    UWav();
    ~UWav();

    int init(const char* fileName);

    //getters
    unsigned short getChannels() const       {return _fmtChunk.wChannels;}
    unsigned long getSamplesPerSec() const   {return _fmtChunk.dwSamplesPerSec;}
    unsigned long getAvgBytesPerSec() const  {return _fmtChunk.dwAvgBytesPerSec;}
    unsigned short getBlockAlign() const     {return _fmtChunk.wBlockAlign;}
    unsigned short getBitsPerSample() const  {return _fmtChunk.wBitsPerSample;}

    unsigned long getDataLength() const      {return _dataChunk.header.size;}

    unsigned long getNumSamplesPerChannel() const;
    unsigned long getNumTotalSamples() const;
    unsigned short getBytesPerSample() const;

    long readData(unsigned char data[], 
                  long offset, 
                  long dataLength);

    long readNextData(unsigned char data[], 
                      long dataLength);

    long readNextSamples(short samples[], 
                         long numSamples);

protected:

private:
    // Define wav structures
    struct ChunkHeader {
        signed char id[4];
        int        size;
    } ;

    struct WavHeader {
        ChunkHeader      header;
        signed char  rifftype[4];
    };

    struct FmtChunk {
      ChunkHeader        header;
      short          wFormatTag;
      unsigned short wChannels;
      unsigned int  dwSamplesPerSec;
      unsigned int  dwAvgBytesPerSec;
      unsigned short wBlockAlign;
      unsigned short wBitsPerSample;
      /* Note: there may be additional fields here, depending upon wFormatTag. */
    };

    struct DataChunk{
      ChunkHeader        header;
    };

private:
    WavHeader _wavHeader;
    FmtChunk _fmtChunk;
    DataChunk _dataChunk;

    const char* _fileName;
    FILE* _pFile;
    bool _initialized;
    long _dataOffset;
};

#endif