[wdmaudiodev] Re: Win7 Dynamic Format Changes - Streaming Minidriver

  • From: Neetu Sand <neetu.freelist@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Fri, 11 Sep 2009 10:47:30 +0530


Thanks for your responses.

@Karthik - I already saw that post and am doing things the way they describe.

@Tim - Yes, We should be notifying the event whenever there is a
format change from driver side but we should be receive the format
changes event from class driver as well. At least this is my
interpretation based on the following link:


where it says:
"In the preceding code example, the MyEventHandler custom event
handler must monitor the KSEVENT_PINCAPS_FORMATCHANGE event .."

Also I am making sure that I call "StreamClassStreamNotification" from
streaming minidriver whenever there is a format change but class
driver does not seem to enumerate format again.

Let me know what you think.

Thanks, Neetu.

On 9/10/09, Neetu Sand <neetu.freelist@xxxxxxxxx> wrote:
> Hi,
> I am trying to implement code so that our driver can report new format
> capabilities under Win 7 using  "Dynamic format changes". Our audio driver
> has been written using "Streaming minidriver" model. So I am using
> KSEVENT_PINCAPS_FORMATCHANGE event to implement this. In order to do this I
> do the following in audio minidriver:
> - Added KSEVENT_TABLE with a KSEVENT_ITEM entry for
> - Added KSEVENT_SET_TABLE with a KSEVENT_SET entry for
> - Added event details in structure- HW_STREAM_INFORMATION.
> - Implemented StrMiniEvent.
> - Provided "HwEventRoutine" in Open Stream call.
> I am not receiving any event callbacks from class driver so I am wondering
> if I am doing something wrong here. Any help is appreciated.
> Thanks, Neetu.

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