[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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