Re: Type of memory in VMR9 allocator

"deadsy" <deadsy@xxxxxxxxx> wrote in message
news:6e0b09de35cb8c82152bb4b0982@xxxxxxxxxxxxxxxxxxxxx
[...] To prevent it I create a temporary buffer and specify it as an
output buffer for transformation function from 3r party library and after
function call I copy data from
temporary buffer to output sample. This is good decision when we use VMR9
as a downstream filter and he provide a video memory in allocator buffers,
but if downstream filter is some kind of transform filter we have a
unnecessary copy operation (and as result another perfomace degradation).

It sounds to me as though you've implemented a typical "copy" transform
filter (ie not in-place). Yes, there is a small performance loss as you do
the additional copy, but if it's a significant problem compared to your
other processing, then you have something wrong with your copy operation.
It should be extremely fast, and inconsequential compared to doing actual
decompression AND post-processing (assuming the decompression and
post-processing are non-trivial).

Pete


.

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