[wdmaudiodev] Re: Wave Device Id to KsPropertySet
- From: "Daniel E. Germann" <deg@xxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Sat, 4 Mar 2006 10:03:01 -0600
Sam,
Take a look at DRV_QUERYDEVICEINTERFACE[SIZE]. These messages allow you to
get the device interface for a particular multimedia device. Given that,
you can open the device and use DeviceIoControl to issue your property
requests.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/Audio_d/hh/Audio_d/pcdesign_008b0368-ccba-42e6-be0f-29b9c8a95fdd.xml.asp
FYI, make sure you send this message to a device ID, *not* to a device
handle (as in waveOutMessage((HWAVEOUT) nId, ...)).
-Dan
----- Original Message -----
From: "Sam Tertzakian"
Subject: [wdmaudiodev] Wave Device Id to KsPropertySet
Date: Fri, 3 Mar 2006 17:01:06 -0800
Hi,
Given a Wave Device Id of an audio device for which I have written an
audio
driver, I need to get a property for the device from the driver.
But, I don't see a clean way to convert a Wave Device Id into a form for
which I can acquire the KsProxy IKsProperty interface exported by my
driver.
Can someone tell me how to do this?
I have tried several options, but none work for various reasons. For
example, I enumerate the DSound devices which give me a corresponding Wave
Device Id. But, the IKsProperty interface for DSound is different (it
seems
to be a different interterface than the KsProxy IKsProperty) and I cannot
access the property I need in the driver.
I only able to access the property if I get the DirectShow IKsProperty
interface, but then I don't know which is the corresponding Wave Device.
Same thing with using SetupApi and using IOCTL_KS_PROPERTY.
Thank you
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