[wdmaudiodev] AVStream - Dynamically constraining to a specific DataRange based on HW.
- From: wade <wdawson61@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 10 Jul 2003 12:25:20 -0700 (PDT)
Hi:
I have a capture-only, pin-centric AVStreams capture driver. I need to force
clients of the driver to accept a specific bit-depth and sample rate as
dictated by the bitsream connect to my hardware. Does anyone know the best way
to do this?
I am attempting to KsEdit the KSPIN_DESCRIPTOR_EX datarange on the fly to
reflect ONLY the curent sample rate and bit depth, but don't know if this is
the right procedure. I have also tried supplying an IntersectHandler function
through the IntersectHandler member of the pin's KSPIN_DESCRIPTOR_EX structure.
I was hoping I could just return a WAVEFORMATPCMEX structure which refelcts my
current hardware reported sample rate and bit depth. Unfortunately, my
IntersectHandler function is never getting called.
Do I have to return STATUS_NO_MATCH from the pin's SetDataFormat() dispatch at
least once to force a format negotiation or something? I'm curently returning
STATUS_SUCESS form this dispatch.
Thanks for any help.
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