Re: waveformatex and fillbuffer()

On Mon, 23 May 2005 23:03:43 -0700, "James" <j.w at No_Spam_Please zoom
co uk> wrote:

>Hi Thore, Sorry, I looked one too far... I was actually returning 128KB from
>CBaseOutputPin::DecideBufferSize(). What I am actually doing is implementing
>my own audio renderer to captrure PCM data, transform it, then feeding it
>back into a recompression graph (to save it back to disk... I am doing more
>than can be applied to a transform filter).
>
>I got the 128KB from the incoming audio renderer (I then use this to set the
>output on the outgoing wav source filter). The trouble turns out to be in
>the renderer. I have overriden just two funcs:
>
>DoRenderSample() and CheckMediaType()

[...]

>Could you advise why FillBuffer is comming back with 128KB in DoRenderSample
>when I would expect 125KB as per CheckMediaType? Have I just got my math
>wrong?

The buffer size is decided when the filters are negotiating an
allocator. Try overriding CBaseInputPin::GetAllocatorRequirements() on
your renderer and propose a buffer size of 128000 bytes, and see if the
upstream filter respects that.

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