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><H1
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><A
NAME="MSACM"
>14.6. MS ACM Dlls</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN4581"
>14.6.1. Contents</A
></H2
><P
> The MSACM32 (and its 16 bit sibbling MSACM) provide a way to
map a given wave format to another format. It also provides
filtering capabilities. Those DLLs only implement the proper
switch between a caller and a driver providing the
implementation of the requested format change or filter
operation.
</P
><P
> There's nothing specific in Wine's implementation compared
to Windows' one. Here's however a list of the builtin format
change drivers (there's no filter driver yet):
<DIV
CLASS="TABLE"
><A
NAME="AEN4585"
></A
><P
><B
>Table 14-3. Wine ACM drivers</B
></P
><TABLE
BORDER="1"
FRAME="border"
RULES="all"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Provides</TH
></TR
></THEAD
><TBODY
><TR
><TD
>imaadp32</TD
><TD
>IMA ADPCM (adaptative PCM)</TD
></TR
><TR
><TD
>msadp32</TD
><TD
>Microsoft's ADPCM (adaptative PCM)</TD
></TR
><TR
><TD
>msg711</TD
><TD
>Microsoft's G.711 (A-Law and ยต-Law)</TD
></TR
><TR
><TD
>winemp3</TD
><TD
> Wine's MP3 (MPEG Layer 3), based on mpglib library
</TD
></TR
></TBODY
></TABLE
></DIV
>
</P
><P
> Note that Wine also supports native audio codecs as
well.
</P
><P
> All builtin ACM drivers are 32 bit Unicode DLLs
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN4607"
>14.6.2. Caching</A
></H2
><P
> The MSACM/MSACM32 keeps some data cached for all known ACM
drivers. Under the key
<PRE
CLASS="SCREEN"
> Software\Microsoft\AudioCompressionManager\DriverCache\<driver name>
</PRE
>
, are kept for values:
<P
></P
><UL
><LI
><P
> <TT
CLASS="LITERAL"
>aFormatTagCache</TT
> which
contains an array of <TT
CLASS="LITERAL"
>DWORD</TT
>. There
are two <TT
CLASS="LITERAL"
>DWORD</TT
>s per <TT
CLASS="LITERAL"
>cFormatTags</TT
>
entry. The first <TT
CLASS="LITERAL"
>DWORD</TT
> contains a
format tag value, and the second the associated
maximum size for a <TT
CLASS="LITERAL"
>WAVEFORMATEX</TT
> structure.
(Fields <TT
CLASS="LITERAL"
>dwFormatTag</TT
> and <TT
CLASS="LITERAL"
>cbFormatSize</TT
> from
ACMFORMATDETAILS)
</P
></LI
><LI
><P
> <TT
CLASS="LITERAL"
>cFilterTags</TT
> contains the number of tags supported by the driver
for filtering.
</P
></LI
><LI
><P
> <TT
CLASS="LITERAL"
>cFormatTags</TT
> contains the number of tags support
by the driver for conversions.
</P
></LI
><LI
><P
> <TT
CLASS="LITERAL"
>fdwSupport</TT
> (the same as the one returned from
<CODE
CLASS="FUNCTION"
>acmDriverDetails</CODE
>).
</P
></LI
></UL
>
</P
><P
> The <TT
CLASS="LITERAL"
>cFilterTags</TT
>,
<TT
CLASS="LITERAL"
>cFormatTags</TT
>,
<TT
CLASS="LITERAL"
>fdwSupport</TT
> are the same values as the
ones returned from <CODE
CLASS="FUNCTION"
>acmDriverDetails</CODE
>
function.
</P
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