[wdmaudiodev] Re: Which audio model is best

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Thu, 10 Mar 2011 09:42:45 -0800

Basileios Bu wrote:
> I know it's bad form to reply to one's mail, but I did forget to
> mention that the device *may* support external clocking, and so in
> that case under Vista and up I will have to support dynamic audio
> subdevices (as I have previously done with portcls).  
> http://msdn.microsoft.com/en-us/library/ff536370(v=vs.85).aspx
> <http://msdn.microsoft.com/en-us/library/ff536370%28v=vs.85%29.aspx>
> So upon change of external clock, the current audio subdevice and
> topology are disconnected and unregistered, and the new ones
> registered and connected.  Any jump to AVStream has to allow for the
> same functionality, or the equivalent.  Note that the only the
> wavecyclic driver unloads and reloads, while the parent bus driver
> does not. Does AVStream support this?

I can't address that specific point.  The set of filters exposed by an
AVStream driver is dynamic, so filters can come and go, but I don't know
whether that supports the functionality you're talking about.

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.


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