typedef struct tACMFORMATDETAILSA
{
    DWORD           cbStruct;
    DWORD           dwFormatIndex;
    DWORD           dwFormatTag;
    DWORD           fdwSupport;
    LPWAVEFORMATEX  pwfx;
    DWORD           cbwfx;
    char            szFormat[ACMFORMATDETAILS_FORMAT_CHARS];

} ACMFORMATDETAILSA, *PACMFORMATDETAILSA, FAR *LPACMFORMATDETAILSA;