typedef struct
{
    vlc_macroblocks_t   vlc_mc;
    XvMCBlockArray      blocks;            /* pointer to memory for dct block array  */
    int                 num_blocks;
    XvMCMacroBlock      *macroblockptr;     /* pointer to current macro block         */
    XvMCMacroBlock      *macroblockbaseptr; /* pointer to base MacroBlock in MB array */
    XvMCMacroBlockArray macro_blocks;      /* pointer to memory for macroblock array */
    int                 slices;
} xvmc_macroblocks_t;