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

[Marc Hoffman]

On 8/16/07, Michael Niedermayer <michaelni at gmx.at> wrote:
> Hi
>
> 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...)

I'm working on it. Although, your assessment that it would be easier
than arguing is not true.