[Webkit-unassigned] [Bug 113527] Add a FFT implementation using kissfft in FFTFrame
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Wed Apr 3 09:46:24 PDT 2013
https://bugs.webkit.org/show_bug.cgi?id=113527
--- Comment #3 from Raymond Toy <rtoy at chromium.org> 2013-04-03 09:44:35 PST ---
(In reply to comment #2)
> (In reply to comment #1)
>
> Thx for the feedback, could you detail "runs about half as" . Do you mean slower or faster ?
Sorry, that confuses me too. To be concrete, a 1024-point complex float FFT takes 190 us with KissFFT and 89.8 us with OpenMAX on a Galaxy Nexus phone. The ratio of KissFFT times to OpenMAX times is roughly 2 for all the orders I tried. If the KissFFT times don't make sense to you, please let me know. Perhaps I made a mistake in compiling it.
>
> Thx
>
> Alex
>
> > (In reply to comment #0)
> > > This is the first step to enable WebAudio on Android.
> > > Adding an extra FFT implementation using kissfft in FFTFrame.
> > > The kissfft patch code could be found under :
> > > https://www.codeaurora.org/patches/quic/webtech/1602-kissfft-add-neon-optimized-routines.patch
> > >
> > > Expected results:
> > > This change should be seamless as used specifically for Android OS
> >
> > Thanks for the link and patch. I ran some tests using your KissFFT implementation on a Galaxy Nexus phone and compared the results with https://code.google.com/p/webrtc/source/browse#svn%2Fdeps%2Fthird_party%2Fopenmax.
> >
> > My tests show that KissFFT runs about half as the OpenMAX implementation.
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