299 typedef struct DVDCommandBlock DVDCommandBlock;  typedef
303 struct DVDCommandBlock  struct
305     DVDCommandBlock* next;  argument
306     DVDCommandBlock* prev;  argument
307     u32              command;
308     s32              state;
309     u32              offset;
310     u32              length;
311     void*            addr;
312     u32              currTransferSize;
313     u32              transferredSize;
337     DVDCommandBlock cb;  argument