[wdmaudiodev] Re: Hardware acceleration format

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 09 Nov 2009 14:01:05 -0800

NCH Obble Smith wrote:
> In case anyone was thinking, the format being played isn't in a DATA
> INTERCEPT or DAtaRange return values either.  I can see the value
> being played on the stack when the function KsCreatePin is called, but
> I dont know how to get to that structure unless I walk the stack. It
> must be provided somehow / somewhere on the IRP_MJ_Create.
> Does any one know of the documentation of IRP_MJ_Create when it comes
> to audio stuff like creating pins?

Whatever you got is just an accident.  There is nothing in the
IRP_MJ_CREATE request that provides for out-of-band information like
this.  You have to watch the property stream.  That's the only way to
get this data.

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


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