typedef struct SHAPE_FLOWGRAPH_ALLOC_MIXBUFFER_COMMAND {  
    UINT64 command : 5;
    UINT64 queued : 1;
    UINT64 disabled : 1;
    UINT64 error : 1;
    UINT64 reserved0 : 5;
    UINT64 numIn : 10;
    UINT64 numOut : 10;
    UINT64 virtualId : 13;
    UINT64 attenuate : 3;
    UINT64 reserved1 : 15;
} SHAPE_FLOWGRAPH_ALLOC_MIXBUFFER_COMMAND