[wdmaudiodev] Re: RegisterSubdevice() and notification
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 23 Nov 2005 08:47:06 -0800
Subdevice registration involves the class driver registering the device
interface with the system. This is alluded to in the
PCRegisterSubdevice() function description at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/Audio_r
/hh/Audio_r/audpc-routines_ba884bcc-8193-4434-9747-d2bce0156eb8.xml.asp?
frame=true
Since a driver can register to receive notification of when device
interfaces are added or removed you can track this. See the
documentation for IORegisterPlugPlayNotification() at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/kmarch/
hh/kmarch/k104_2210e60c-f9ca-4848-8aab-7b01d2d2ffd7.xml.asp
And for a more thorough explanation read "Registering for Device
Interface Change Notification" at:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/Kernel_
d/hh/Kernel_d/PlugPlay_c34c39cd-8cdb-4e80-9c71-4da168de62fd.xml.asp?fram
e=true
Hope this helps,
Richard Fricks
Microsoft DDK - Audio
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Sam Tertzakian
Sent: Wednesday, November 23, 2005 8:25 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: RegisterSubdevice() and notification
Using AVStream model, I am pretty sure you can do what you need. It is
very dynamic and filters and pins can easily be created/destroyed.
Using the other models, it may be more difficult...if not impossible.
But, perhaps someone else has a different point of view.
If you have not written code yet, then I would look at using AVStream.
If you already have a driver written using Portcls or something else,
then I am not sure.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of R. Geller
Sent: Monday, November 21, 2005 1:10 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] RegisterSubdevice() and notification
I am trying to develop an virtual driver which can
pass audio data to the other device. However I
encounter a problem that the hardware codec driver can
change the playback or recording devices on the fly.
The hardware code driver uses RegisterSubdevice() and
UnregisterSubdevice() to change the devices
dynamically. These two calls don't issue any
unload/reload IRP. Then how can I know the change of
the hardware codec driver?
Does anybody know how the virtual driver can get the notification for
the change of the hardware codec driver if the virtual driver is on top
of the portcls? Thanks
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