[wdmaudiodev] Re: How to support IMiniportAudioSignalProcessing in WaveCyclic based audio driver?
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 21 Jan 2014 16:38:42 +0000
In particular, implement IMiniportAudioSignalProcessing::GetModes, and respond
to QueryInterface for IID_IMiniportAudioSignalProcessing, and portcls will call
into your GetModes() method. This should work even though you are WaveCyclic
and not WaveRT.
The relevant code in
http://code.msdn.microsoft.com/windowshardware/slate-system-virtual-audio-f241062f/sourcecode?fileId=86816&pathId=1882676779
is:
// minwavert.h
class CMiniportWaveRT :
public IMiniportWaveRT,
public IMiniportAudioEngineNode,
public IMiniportAudioSignalProcessing,
public CUnknown
...
IMP_IMiniportAudioSignalProcessing;
// minwavert.cpp
STDMETHODIMP_(NTSTATUS)
CMiniportWaveRT::NonDelegatingQueryInterface
...
else if (IsEqualGUIDAligned(Interface, IID_IMiniportAudioSignalProcessing))
{
*Object = PVOID(PMINIPORTAudioSignalProcessing(this));
}
...
NTSTATUS
CMiniportWaveRT::GetModes
(
_In_ ULONG Pin,
_Out_writes_opt_(*NumSignalProcessingModes) GUID* SignalProcessingModes,
_Inout_ ULONG*
NumSignalProcessingModes
)
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matthew van Eerde
Sent: Tuesday, January 21, 2014 8:01 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: How to support IMiniportAudioSignalProcessing in
WaveCyclic based audio driver?
Yes, the WaveCyclic miniport model supports IMiniportAudioSignalProcessing.
What do you do with the audio data once you get it? That is, what is the layer
below you? That should determine your choice of WaveCyclic or WaveRT.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Danny
Sent: Tuesday, January 21, 2014 1:28 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] How to support IMiniportAudioSignalProcessing in
WaveCyclic based audio driver?
Hello, my driver is a virtual sound driver based on WaveCyclic. It worked fine
on Windows 8, but during WHCK KsPosition test, the test fails with the
following error message.
Message
12/6/2013 2:10:26.125 PM
Failed to query for basic support KSPROPERTY_AUDIOSIGNALPROCESSING_MODES: Last
error:1170
Can I add support for IMiniportAudioSignalProcessing in WaveCyclic based audio
driver?
I've noticed that the new WDK sample SysVad support
IMiniportAudioSignalProcessing property. But it was based on WaveRT.
Or should I change my project to WaveRT based example? Does WaveRT works for
virtual sound driver? (We don't have the codec hardware, just to capture the
pcm audio data and send out to another stack.)
Thank you!
--
Danny
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