[FFmpeg-devel] [PATCH] allow different input/output buffers for DC filter

Ronald S. Bultje rsbultje
Fri Mar 12 23:05:36 CET 2010


On Fri, Mar 12, 2010 at 4:33 PM, Ronald S. Bultje <rsbultje at gmail.com> wrote:
> see attached. Yes, WMAVoice uses different buffers, and thus the
> history used to multiply the coefficients with are different for the
> two lines. I'm kind of surprised that this isn't the case for AMR-NB /
> Sipr also, maybe this is a bug? Wikipedia suggest that the two buffers
> SHOULD be different
> (http://en.wikipedia.org/wiki/Digital_filter#Difference_equation).

I think in hindsight I completely misunderstood the function, so patch

Now I need to still actually properly understand it.


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