ubuntu-audio-dev team mailing list archive

["Alexander E. Patrakov" <patrakov@xxxxxxxxx>]

20.11.2014 12:35, David Henningsson wrote:
> Crossposting to Debian and upstream lists.
>
> Apparently Debian has a patch that uses fixed point by default on armhf,
> so I'm just echoing Luke's question here: Has anybody performed any
> testing or benchmarks across armhf hardware, w r t fixed point vs
> floating point resampling with speex and PulseAudio?

That patch has been superseded by this commit:

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=ac984f59d36ef555bc5b0df9af1cd48193d0d14f

So, if you prefer a fixed-point resampler on armhf (or, for that matter, 
on any other architecture), just compile speex with --enable-fixed-point 
there.

The benchmarking question is still open.

> Reference:
> http://anonscm.debian.org/cgit/pkg-pulseaudio/pulseaudio.git/tree/debian/patches/0002-Use-the-fixed-point-speex-resampler-on-ARM.patch
>
>
> On 2014-11-18 00:25, Luke Yelavich wrote:
> > Hey folks.
> > I'm starting to work on merging Ubuntu and Debian packaging for
> > pulseaudio. One of the patches Debian currently has is to use fixed
> > point on all arm flavours they support. The argument given is that
> > float resampling doesn't necessarily perform better than fixed point
> > resampling, even on hard float capable hardware, and sometimes it is
> > worse. here is the blurb taken from the patch:
> >
> > Switch to use the speex fixed point resampler method by default on ARM.
> > Traditionately there wasn't any standard floating point hardware, so for
> > those machines it's an obvious choise. On machine using the hardfloat
> > ABI floating point still isn't an obvious win over integer performance,
> > it's of equal performance on some machines, but slower on others.
> >
> > Has anybody performed any testing or benchmarks on the hardware we
> > support? Should we just drop this and continue to use floating point
> > resampler code?
> >
> > Luke
> >
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--
Alexander E. Patrakov