[wdmaudiodev] Re: Obtaining unique identifier of Filter from its DispatchRoutines

  • From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Thu, 19 Feb 2009 13:53:44 +1100

Hi Swapnil,
You can use the FileObject on the IrpStack to identify which subdevice it's referring to. The field pIrpStack->FileObject->FileName will contain the name of your subdevice (eg. WAVE1). 

Jeff

I should add that the FileName field is only present in an IRP_MJ_CREATE
IRP, so you will need to save the actual FILE_OBJECT pointer in your Create
handler and compare that against the FILE_OBJECT pointer in other IRPs to
see if they relate to the same subdevice.


Jeff










----- Original Message -----
From: swapnil kamble

To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Wednesday, February 18, 2009 11:30 PM

Subject: [wdmaudiodev] Obtaining unique identifier of Filter from its
DispatchRoutines



Hi All,

 I have created multiple instances of my Filter Centric AVStream
driver by using a call KsCreateFilterFactory (), in which I give RefString
name which matches with "wave name" in INF, and FilterDescriptor table,
which contains functions pointers related with Filter. Currently I am
using DispatchCreate and DispatchProcess.



What I want is, whenever any of Dispatch Routine related to that filter is
called, I want to know, which filter is responsible or associated with
this call.



Lets say I have 2 filters name VAD1,VAD2 with wave name WAVE1,WAVE2. I
want to get either of these identifier from its DispatchRoutines to
identify the filter correctly.


Thanks and Regards,
--
...Swapnil

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|| Hare Rama    Hare Rama   Rama   Rama    Hare Hare ||
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