302 typedef struct DVDCommandBlock DVDCommandBlock;  typedef
304 typedef void (*DVDCBCallback)(s32 result, DVDCommandBlock* block);
306 struct DVDCommandBlock  struct
308     DVDCommandBlock* next;  argument
309     DVDCommandBlock* prev;  argument
340     DVDCommandBlock cb;  argument
467 s32  DVDChangeDisk       ( DVDCommandBlock* block, DVDDiskID* id );
469 BOOL DVDChangeDiskAsync  ( DVDCommandBlock* block, DVDDiskID* id,
474                          ( const DVDCommandBlock* block );
571 BOOL DVDCancelAsync(DVDCommandBlock* block, DVDCBCallback callback);
572 s32 DVDCancel(DVDCommandBlock* block);
582 BOOL DVDCheckDiskAsync(DVDCommandBlock* block, DVDCBCallback callback);