typedef struct SHAPE_PCM_CONTEXT {
    UINT32 bufferStart : 32;  
    UINT32 bufferLength : 21;  
    UINT32 reserved0 : 11;  
    UINT32 loopCount : 8;  
    UINT32 reserved1 : 8;  
    UINT32 full : 1;  
    UINT32 reserved2 : 15;  
    UINT32 readPointer : 21;  
    UINT32 reserved3 : 11;  
    UINT32 loopStartWritePointer : 21;  
    UINT32 reserved4 : 11;  
    UINT32 loopEnd : 21;  
    UINT32 reserved5 : 11;  
    UINT32 mode : 1;  
    UINT32 reserved6 : 15;  
    UINT32 format : 2;  
    UINT32 reserved7 : 14;  
    UINT32 reserved[1];  
} SHAPE_PCM_CONTEXT