[wdmaudiodev] Windows XP, KS, usbaudio and 'Extension Units'
- From: "Nick Postnikov" <pnp@xxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 23 Nov 2007 15:17:12 +0300
Hi all.
My USB audio device contains Extension Unit (XU), which is enumerated as
KSNODE_TYPE_DEV_SPECIFIC by KS. I want to send Extension Unit Control
Requests (USB Audio 1.0 spec., 5.2.2.6) from user mode API. I read "USB
Audio Devices and Windows"
(http://download.microsoft.com/download/5/7/7/577a5684-8a83-43ae-9272-ff260a9c20e2/USB_Audio_and_Windows.doc)
and found two KS properties for use.
1. KSPROPSETID_TopologyNode, KSPROPERTY_TOPOLOGYNODE_ENABLE to turn XU on
and off.
2. KSPROPSETID_Audio, KSPROPERTY_AUDIO_DEV_SPECIFIC to send XU control
requests.
usbaudio.sys driver uses special struct for DEV_SPECIFIC property
struct {
KSNODEPROPERTY NodeProperty;
ULONG DevSpecificId;
ULONG DeviceInfo;
ULONG Length;
} KSNODEPROPERTY_AUDIO_DEV_SPECIFIC, *PKSNODEPROPERTY_AUDIO_DEV_SPECIFIC;
My code is (NodeId=1):
.....
pMoniker->BindToObject( NULL, NULL, IID_IBaseFilter, (void**)&pFilter );
.....
CComQIPtr<IKsControl> pCtrl = pFilter;
ULONG ret;
KSP_NODE nodeNameGet = { { KSPROPSETID_Topology, KSPROPERTY_TOPOLOGY_NAME,
KSPROPERTY_TYPE_GET | KSPROPERTY_TYPE_TOPOLOGY },1,0 };
WCHAR name[64];
hr = pCtrl->KsProperty( &nodeNameGet.Property, sizeof( nodeNameGet ), name,
sizeof( name ), &ret );
// hr = S_OK, name[] is correct
KSP_NODE nodePropGet = { { KSPROPSETID_TopologyNode,
KSPROPERTY_TOPOLOGYNODE_ENABLE,
KSPROPERTY_TYPE_GET | KSPROPERTY_TYPE_TOPOLOGY },1,0 };
BOOL enabled;
hr = pCtrl->KsProperty( &nodePropGet.Property, sizeof( nodePropGet ),
&enabled, sizeof( enabled ), &ret );
hr = 0x80070490 Element not found.
What's wrong? Any suggestions?
Thanks in advance.
******************
WDMAUDIODEV addresses:
Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx
Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe
Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe
Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx
URL to WDMAUDIODEV page:
http://www.wdmaudiodev.com/
Other related posts:
- » [wdmaudiodev] Windows XP, KS, usbaudio and 'Extension Units'
