[wdmaudiodev] Re: AVStream Capture question
- From: wade <wdawson61@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 17 Jul 2003 13:01:02 -0700 (PDT)
Harry:
Thanks for your response. A question though. In you opinion, should I set the
KSPIN_DESCRIPTOR.Flags (KSPIN_FLAG_INITIATE_PROCESSING_ON_EVERY_ARRIVAL) to
force a call to my AvStrProcess() when new frames arrive? I'm assuming this
way I can fill newly arriving frames with any data that may not have fit at DPC
time (if, for instance, KsStreamPointerAdvanceOffsets caused queue run off) .
I'm assuming that the arrival of a new frame should trigger me to transfer the
rest of the data that the DPC's Processing call couldn't. In the case of no
data lying around from the last DPC (it all fit in the available frames the
time DPC called KsPinAttemptProcessing()) ) I'm assuming that I should just
return STATUS_PENDING, and return STATUS_SUCCESS when I fill and complete
frames?
Thanks for your help.
Harry Graham <harry_graham@xxxxxxxxxx> wrote:
v\:* {behavior:url(#default#VML);}o\:* {behavior:url(#default#VML);}w\:*
{behavior:url(#default#VML);}.shape {behavior:url(#default#VML);}
Wade,
There are many different ways to use the stream pointers in AVStream. I have
not personally used KsStreaPointerGetNextClone, but I suspect that this is
causing your problem.
I would suggest calling KsPinAttemptProcessing from the DPC, and perform all
the stream pointer manipulation and hardware queuing in the Process callback.
Harry
-----Original Message-----
From: wade [mailto:wdawson61@xxxxxxxxx]
Sent: Wednesday, July 16, 2003 5:01 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] AVStream Capture question
Hi:
I'm writing a capture-only AVStreams driver for a simple piece of hardware. I
get an ISR dispatch and queue my DPC to move x samples to AVStream frames. In
my AvStrMiniProcess (called on every frame arrival and loosely based on Avshws)
routine I am advancing through the Avstream queue cloning pointers to each
frame. I return STATUSS_SUCCESS on the frames I'm able to clone and
STATUS_PENDING on the ones I can't. In my DPC I step through the Clones using
KsStreamPointerGetNextClone(), filling the frames and deleting the clone
pointers as the frame is filled.
KSStudio never shows the frames being completed. KS's dispatch timer is
canceling them.
Is there an easier or better way to do this? I'm about ready to break down and
allocate a NonPaged buffer for my DPC to put samples in and fill the AVStream
frames as they arrive in my AvStrMiniProcess routine. Any help is greatly
appreciated.
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