Output Pin Custom Allocator

Hi all,
I am also facing a similar situation as described in this
previous thread
http://groups.google.co.in/group/microsoft.public.win32.programmer.directx.video/browse_thread/thread/6d1817c7da70e5e7/8430c14a004875a3?hl=en&lnk=gst&q=own+allocator+output+pin#8430c14a004875a3

- i have a transform filter using a CTransformFilter class
-I want the GetPointer in transform method return me a buffer using
custom allocator(maybe a physical address,which i have allocated)
-And i want the downstream default video renderer to take this buffer.

the msdn pages about custom allocator is not very clear on this.Is
this possible in the first place?any help would be appreciated
thnx and regards
anand
.

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