Hi Vadim,
I tried your forked project, works fine and faster in 64bit version, but in
32bit i get
./c2demo ../raw/hts1a.raw hts1a_c2.raw
Segmentation fault
Thanks/Andreas
On Nov 14, 2012, at 9:45 AM, Markovtsev Vadim <[email protected]> wrote:
> Hi all,
>
> since KISS FFT used by codec2 is rather slow (it is KISS after all), it is
> reasonable to add other FFT engines support to codec2 (like in speex). I
> managed to implement libavcodec FFT support. The forked project is at
> https://github.com/vmarkovtsev/codec2
>
> I had to move from autoconf/configure.in to autogen.sh/configure.ac,
> improving the build system a little bit. I could have broken some things
> though. configure script has two new options now, --enable-libavcodec-fft and
> –enable-neon. The former switches FFT engine from KISS to libavcodec. The
> latter adds “-mfpu=neon” to CFLAGS and defines NEON macro (used for ARM NEON
> optimizations). Currently, there are no NEON optimizations actually except
> load/store in FFT bridge, which do not improve the performance much but are
> still a good idea.
>
> I measured the time needed to encode+decode a sample file (20-minute radio
> broadcast) with c2demo, using KISS FFT and libavcodec FFT. Briefly: on intel
> core i7-2600 CPU, I got a 34% speedup and on Samsung Exynos 4 CPU, I got a
> 15% speedup.
>
> I would be glad to merge with upstream.
>
> Regards,
> Vadim Markovtsev,
> Engineer, Algorithmic Lab,
> Moscow R&D center, Samsung Electronics
>
>
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