[wdmaudiodev] Re: Anybody got any information about the IRPs in an upper filter?
- From: NCH Obble Smith <Obble@xxxxxxxxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sun, 18 Oct 2009 16:55:53 +1100
It's amusing that you couldn't chase down this information, because it
is all clearly documented. The ioctl code is IOCTL_KS_PROPERTY, which
is documented. The buffer contains a KSPROPERTY and a KSDATAFORMAT.
The property GUID is "1D58C920-...", which is KSPROPSETID_Connection.
The property number is 2, which is KSPROPERTY_CONNECTION_DATAFORMAT,
also well documented. The flags word is KSPROPERTY_TYPE_SET, which
means the caller is trying to set the data format. The rest of this
should be a KSDATAFORMAT.
A bit embarrassing, I had a bug in the output where I was looping for
the buffer with i++ and p++ meaning i missed every 2nd line which was
why I was baffled why the guid didn't match. I have since learn how
to debug in kernel mode :-D and in a ureaka moment I released what
KSPROPERTY.id is for from your statement above.
The IO codes are all making scene now.
Thanks again for your help.
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