299 typedef struct DVDCommandBlock DVDCommandBlock;  typedef
301 typedef void (*DVDCBCallback)(s32 result, DVDCommandBlock* block);
303 struct DVDCommandBlock  struct
305     DVDCommandBlock* next;  argument
306     DVDCommandBlock* prev;  argument
337     DVDCommandBlock cb;  argument
464 s32  DVDChangeDisk       ( DVDCommandBlock* block, DVDDiskID* id );
466 BOOL DVDChangeDiskAsync  ( DVDCommandBlock* block, DVDDiskID* id,
471                          ( const DVDCommandBlock* block );
566 BOOL DVDCancelAsync(DVDCommandBlock* block, DVDCBCallback callback);
567 s32 DVDCancel(DVDCommandBlock* block);
577 BOOL DVDCheckDiskAsync(DVDCommandBlock* block, DVDCBCallback callback);