typedef struct adpcmwaveformat_tag {
        WAVEFORMATEX    wfx;
        WORD            wSamplesPerBlock;
        WORD            wNumCoef;
#if defined( _MSC_VER )        
        ADPCMCOEFSET    aCoef[];
#else
        ADPCMCOEFSET    aCoef[1];
#endif        
} ADPCMWAVEFORMAT;

typedef ADPCMWAVEFORMAT       *PADPCMWAVEFORMAT;

typedef ADPCMWAVEFORMAT NEAR *NPADPCMWAVEFORMAT;

typedef ADPCMWAVEFORMAT FAR  *LPADPCMWAVEFORMAT;