Re: AVStream: DMA & Process() QUEUEing

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From: Max Paklin (mpaklin_at_hotmail.com)
Date: 05/26/04 

Date: Wed, 26 May 2004 11:45:13 -0700

> What I was getting at was that the Flag
> (KSPIN_FLAG_INITIATE_PROCESSING_ON_EVERY_ARRIVAL) states that the
> process dispatch is only called when data arrives into a previously
> empty queue.

Which DDK are you reading?
Mine says
"Indicates that processing should occur every time a data frame arrives into
the queue. Without specifying this flag of
KSPIN_FLAG_DO_NOT_INITIATE_PROCESSING, the process dispatch is only called
when data arrives into a previously empty queue."

When you specify KSPIN_FLAG_INITIATE_PROCESSING_ON_EVERY_ARRIVAL processing
takes places every time a frame is queued.

> How can the QUEUE be empty when I have cloned stream pointers on a Frames?
>
> Cloning increases the reference count of the Frame thus not allowing the
> frame to be cancelled, thus ensuring that the QUEUE is not empty.

It is NOT empty.
You misinterpreted KSPIN_FLAG_INITIATE_PROCESSING_ON_EVERY_ARRIVAL flag.
To get what you want you have to __NOT__ specify
KSPIN_FLAG_INITIATE_PROCESSING_ON_EVERY_ARRIVAL and __NOT__ specify
KSPIN_FLAG_DO_NOT_INITIATE_PROCESSING on your pin.

> Put in what you mentioned to return STATUS_PENDING but just wondering
> why I get the second call to Process().

Because you asked for it. You get notified each time a frame is inserted in
the queue.

-- Max.

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