_The VESA BIOS Extension/Audio Interface_
by Doug Cody


[LISTING ONE]

typedef struct {

    // housekeeping

    char wsname[4];     // name of the structure
    long wslength;      // structure length

    char wsfuture[16];      // 16 bytes for future expansion

    // device driver functions

    long (pascal far *wsDeviceCheck ) (int, long );
    int  (pascal far *wsPCMInfo     ) (int, long, int, int );
    int  (pascal far *wsPlayBlock   ) (void far *, long );
    int  (pascal far *wsPlayCont    ) (void far *, long, long);
    int  (pascal far *wsRecordBlock ) ();
    int  (pascal far *wsRecordCont  ) (void far *, long, long);
    int  (pascal far *wsPauseIO     ) ();
    int  (pascal far *wsResumeIO    ) ();
    int  (pascal far *wsStopIO      ) ();
    void (pascal far *wsTimerTick   ) ();
    int  (pascal far *wsGetLastError) ();

    // callback filled in by the application

    void (pascal far *wsApplPSyncCB ) (int, void far *, long ); //play
    void (pascal far *wsApplRSyncCB ) (int, void far *, long ); //rec

} WAVEService, far *fpWAVServ;


[LISTING TWO]

typedef struct {

     // housekeeping

     char msname[4];        // name of the structure
     long mslength;     // structure length

     // runtime data

     int  mspatches[16];    // patches loaded table bit field
     char msfuture[16];     // 16 bytes for future expansion

     // device driver functions

     long ( pascal far *msDeviceCheck ) (int, long );
     int  ( pascal far *msGlobalReset ) ();
     int  ( pascal far *msMIDImsg     ) (char far *, int );
     int  ( pascal far *msPollMIDI    ) (int );
     int  ( pascal far *msPreLoadPatch) (int, int, void far *, long );
     int  ( pascal far *msUnloadPatch ) (int, int );
     void ( pascal far *msTimerTick   ) ();
     int  ( pascal far *msGetLastError) ();

     // callbacks filled in by the application

     void ( pascal far *msApplFreeCB ) ( int, int, void far * );
     void ( pascal far *msApplMIDIIn ) ( int, int, char );

} MIDIServ, far *fpMIDServ;


[LISTING THREE]

typedef struct {

    // housekeeping

    char vsname[4];     // name of the structure
    long vslength;      // structure length

    char vsfuture[16];      // 16 bytes for future expansion

    long (pascal far *vsDeviceCheck  ) (int , long );
    void (pascal far *vsSetVolume    ) (int , int , int );
    long (pascal far *vsSetFieldVol  ) (int , int , int );
    int  (pascal far *vsToneControl  ) (int , int , int );
    long (pascal far *vsFilterControl) (long );
    void (pascal far *vsOutputPath   ) (int );
    void (pascal far *vsResetChannel ) ();
    int  (pascal far *vsGetLastError ) ();

} VolumeService, far *fpVolServ;