[wdmaudiodev] Re: Problems with wrapping the Microsoft APO (was Multiple APOs in Vista?)

  • From: "Michael R. Preston" <mike@xxxxxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Thu, 05 Oct 2006 09:50:48 -0700

Thanks for the official response. I don't have a problem with IHVs having to do their own GUI for their own effects using their own property store GUIDs. What I do have a problem with is two things:

1. Not being able to reuse the Room Correction wizard without having to reuse the whole Microsoft APO property page GUI.
2. Not being able to replace the Microsoft speaker configuration GUI with the IHVs custom Bass Management/Speaker Phantoming GUI.

Is either of these possible? The other features provided by the Microsoft APO have much simpler GUIs - sometimes just a simple on/off switch. Those should be quite easy to replicate in the IHVs GUI. However, the Room Correction wizard is quite complicated, as it is a complicated feature. Forcing IHVs to either use the entirety of the Microsoft APO/GUI package or replace all the functionality with their own (including Room Correction) is really putting the IHVs in a bad position. It makes their decisions on doing their own custom effects much more complicated.

In light of all this, does this mean that Microsoft is going to relax its requirement about having IHVs replace all the built-in functionality? If the audio infrastructure in Vista has been defeatured, it makes sense for the IHV requirements to reflect this.


wdmaudiodev-bounce@xxxxxxxxxxxxx wrote:
You guys are pointing at one area where your disappointment truly echoes
our own. The lack of UI extensibility is regrettably true, one of the
victims of feature cut-back. The documentation will be corrected to
reflect reality better.

While we sure had larger plans for this part of the audio infrastructure
in Vista we got only half-way there this time around. Bottom line is
that if you want your own UI for your own FXs you have to create it and
map it to your own property store.


Hakon Strande
PM Integrated, Internal, External, and Wireless Audio Devices
MediaTech/DMD/Windows Client/Microsoft

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Jeff Claar
Sent: Wednesday, October 04, 2006 3:51 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Problems with wrapping the Microsoft APO (was
Multiple APOs in Vista?)

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.


-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R.
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...


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


you can have one subkey for the LFX, one subkey for the GFX, and one
subkey for the configuration UI.

-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Mike Preston | Home/Office: (360)756-1655 | | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | 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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