308 typedef struct DVDCommandBlock DVDCommandBlock;  typedef
310 typedef void (*DVDCBCallback)(s32 result, DVDCommandBlock* block);
312 struct DVDCommandBlock  struct
314     DVDCommandBlock* next;  argument
315     DVDCommandBlock* prev;  argument
346     DVDCommandBlock cb;  argument
473 s32  DVDChangeDisk       ( DVDCommandBlock* block, DVDDiskID* id );
475 BOOL DVDChangeDiskAsync  ( DVDCommandBlock* block, DVDDiskID* id,
480                          ( const DVDCommandBlock* block );
577 BOOL DVDCancelAsync(DVDCommandBlock* block, DVDCBCallback callback);
578 s32 DVDCancel(DVDCommandBlock* block);
588 BOOL DVDCheckDiskAsync(DVDCommandBlock* block, DVDCBCallback callback);