[wdmaudiodev] Re: Problems with wrapping the Microsoft APO (was Multiple APOs in Vista?)
- From: "Jeff Claar" <JClaar@xxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 4 Oct 2006 15:51:13 -0700
Thanks for the updates. In a separate email thread I got some
clarification from Hakon Strande.
He said that multiple APOs per device should be allowed. However, there
can only be one LFX and one GFX APO per endpoint.
This is in conflict with what's on page 10 of the same document, where
it describes how to install multiple APOs on the same endpoint. (Using
FX\0, FX\1, FX\2, etc.) Hakon said that this was never the intention,
and will not be supported.
I also agree about the frustrations with the Enhancements page. This is
true if you add features as well -- there seems to be no way to add any
additional features without writing a separate app. But if you do that,
you can only get read-only access to the endpoint property store, and
there is no way to get a pointer to the FX store.
Jeff
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R.
Preston
Sent: Wednesday, October 04, 2006 2:56 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Problems with wrapping the Microsoft APO (was
Multiple APOs in Vista?)
No, that's not correct. The LFX, GFX, and GUI are all registered under
the same FX subkey, but with different property IDs (a property ID is a
combination of a GUID and an integer index value). It's not clear from
the SysFX document what purpose multiple APOs for the same endpoint
would be. Elsewhere in the same document (on page 4) the following is
stated:
"Each Plug and Play hardware ID can be associated with only one GFX and
one LFX sAPO."
I don't think this is referring to multiple endpoints within the same
Hardware ID, since each of them would get installed as "FX\0" for each
endpoint. Sounds like we need some clarification here...
Mike
Tim Roberts wrote:
> Michael R. Preston wrote:
>
>
>> The more I've looked into wrapping the Microsoft APO, the more
>>difficult I find it. Sure, Microsoft gives you examples on how to do
>>it, but the manner in which it's supported is extremely limiting for
>>the IHVs. I'm not sure about the multiple FX key issue from the APO
>>standpoint, ...
>
>
>
> My interpretation of the "multiple FX key" thing in the document is
that
> you can have one subkey for the LFX, one subkey for the GFX, and one
> subkey for the configuration UI.
>
--
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| Mike Preston | Home/Office: (360)756-1655 |
| E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 |
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| The man who follows the crowd will usually get no |
| further than the crowd. The man who walks alone is |
| likely to find himself in places no one has ever been. |
| -- Alan Ashley-Pitt |
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