Hello all-
Here are some questions that have come up on unrelated projects:
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Our current PCI cards are 32 bit/33 MHz. I am investigating porting to
64 bit Windows. The snag, obviously, is that the card can't address
physical memory past 4 GB.
Right now, the driver uses the WavePci port/miniport model. I would
think that this would be OK if, in the NewStream call, I just return a
pointer to an IDmaChannel that's set up properly for this situation.
However, the docs state "...port driver never uses the /DmaChannel/
pointer that it receives from the *NewStream* call".
So - is this statement still true in 64 bit Windows? Are my DMA
parameters being ignored for the WavePci mappings? Do I have to
double-buffer the memory myself?
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My second question has to do with cloning stream pointers in an AVStream
driver. Are stream pointer clones allocated from a lookaside list or
something similar? The docs seem to encourage cloning; I just want to
have warm fuzzies that I'm not doing lots of heap allocations and
causing memory fragmentation.
Thanks,
Matt
