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13.7. MS ACM Dlls

13.7.1. Contents

tbd

13.7.2. Status

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13.7.3. Caching

The MSACM/MSACM32 keeps some data cached for all known ACM drivers. Under the
key
                  Software\Microsoft\AudioCompressionManager\DriverCache\<driver
                  name>
                
are kept for values:

  * aFormatTagCache which contains an array of DWORD. There are two DWORDs per
    cFormatTags entry. The first DWORD contains a format tag value, and the
    second the associated maximum size for a WAVEFORMATEX structure. (Fields
    dwFormatTag and cbFormatSize from ACMFORMATDETAILS)
   
  * cFilterTags contains the number of tags supported by the driver for
    filtering.
   
  * cFormatTags contains the number of tags support by the driver for
    conversions.
   
  * fdwSupport (the same as the one returned from acmDriverDetails).
   
The cFilterTags, cFormatTags, fdwSupport are the same values as the ones
returned from acmDriverDetails function.

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