[wdmaudiodev] Software-only GFX APO
- From: "Chunk Systems" <junk@xxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 2 Jul 2007 16:46:32 +1000
Hi all,
I'm trying to figure out whether its possible to create a software-only GFX
APO so that a customer can download and install a software package which
affects all audio coming out of the machine. Would it feasible to create an
install program which:
1. registers a new APO dll.
2. creates or overwrites the following registry key with the CLSID of the
new APO:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render\<endpo
int>\FxProperties\d04e05a6-594b-4fb6-a80d-01af5eed7d1d},2
3. creates or overwrites the following registry key with the CLSID of the
new property page:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render\<endpo
int>\FxProperties\d04e05a6-594b-4fb6-a80d-01af5eed7d1d},3
4. the original APO calls through to whatever APO was originally installed
and then applies its effect afterwards.
Now, I realise that the APO system is designed for IHVs, but does anybody
have any comments on the feasibility of this approach?
On a related question, Microsoft's sysfx.doc document says:
Note: The INF does not modify the FXProperties registry key directly.
Instead, it modifies the FX key as shown in the preceding example, and the
value is then migrated to the FXProperties key in the MMDevice section.
In other words, at some point, the APO settings from
HKLM\SYSTEM\CurrentControlSet\Control\DeviceClasses\...
to
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\...
Is anybody able to explain when or how this migration takes place, and which
keys are migrated?
Any help you can offer would be greatly appreciated.
Thanks,
Richard Cartwright
Chunk Systems
http://www.chunksystems.com
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