[FFmpeg-devel] Fwd: Fixpoint FFT optimization, with MDCT and IMDCT wrappers for audio optimization

Michael Niedermayer michaelni
Thu Aug 16 20:23:33 CEST 2007


On Thu, Aug 16, 2007 at 04:41:21PM +0200, Guillaume POIRIER wrote:
> Hi,
> On 8/16/07, Marc Hoffman <mmhoffm at gmail.com> wrote:
> > I'm thinking that it might be better to define a fix point fft based
> > on the reference float version like you have done.  And then hook
> > optimizations via dsputils DSPContext, then you can just override the
> > default behavior how ever you want for what ever platform you desire.
> >
> > What do you think?
> Well, don't forget that according to Michael, FFmpeg's FFT sucks, so
> writing a fixed-point version of a sucky implementation may not be so
> wise :-(

dont fear ill revert any cooley tukey fixed point FFTs which get commited

which brings us back to what i already said ... someone should implement
a split radix fft (changing the current float fft to split radix would
surely be nice as well...)

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Dictatorship naturally arises out of democracy, and the most aggravated
form of tyranny and slavery out of the most extreme liberty. -- Plato
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