302 typedef struct DVDCommandBlock DVDCommandBlock;  typedef
306 struct DVDCommandBlock  struct
308     DVDCommandBlock* next;  argument
309     DVDCommandBlock* prev;  argument
310     u32              command;
311     s32              state;
312     u32              offset;
313     u32              length;
314     void*            addr;
315     u32              currTransferSize;
316     u32              transferredSize;
340     DVDCommandBlock cb;  argument