dynamic allocation for media sample?

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Hi,

I have developed 2 direct show filters: source filter and transform
filter. However, I find the method CBaseOutputPin::DecideBufferSize
very restricting.

Do I have to tell the pin what is the maximum size of media sample
before connection is made?

Cann't I dynamically allocate memory in FillBuffer (for source filter)
or Transform (for transform filter) and then pass size of this
allocated buffer to downstream filter?

Thanks,
Vikram

.

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