[Speex-dev] Speex on Nokia Symbian S60 phones

[Jean-Marc Valin]

Quoting "Fabio Pietrosanti (naif)" <lists at infosecurity.ch>:
> It would be very nice to know about some good success without too much
> cpu issues on Nokia devices, i tried pjsip.org project on S60 FP1 E65
> +200mhz ARM cpu with speex but don't had much luck in using it without
> having 100% cpu usage :(

Make sure to use complexity 1 (using SPEEX_SET_COMPLEXITY) and use 6, 8, or 15
kbps, which are the rates that take up the least amount of CPU. Also, make sure
you don't have VBR, VAD or DTX enabled as those still use floating-point code.
If it still takes 100% CPU on a 200 MHz ARM, you either did something wrong or
you should switch compiler.

Cheers,

    Jean-Marc

> Please let us to know about your testing
>
> E65 CPU: http://www.nokia-tuning.net/index.php?s=processor
>
> Fabio Pietrosanti
>
> Jordan Dimov wrote:
> > Thank you, guys.
> >
> > Most smartphones in production today run at ~300MHz and above.  So
> > this shouldn't be a problem.  I'll try to compile speex for Symbian (I
> > see it's been ported, but the Symbian port is somewhat out of date?)
> > and I'll run it on a pair of Nokia N76 phones.  I'll let you know how
> > it works out.
> >
> > If someone has any further advice in this direction, I would deeply
> > appreciate it.
> >
> >     Quoting "Fabio Pietrosanti (naif)" <lists at infosecurity.ch>:
> >
> >     > If you are using CSD, like for a secure telephony solution
> >     > (http://m.privategsm.com), consider that speex is VBR and VBR
> >     codecs are
> >     > not recommended for security reasons
> >     (http://zfoneproject.com/faq.html#vbr) .
> >
> >
> > Does this have something to do with side-channel attacks?
> >
> > Anyway... I'll just use speex with CBR.  Thanks for the tip.
> >
> > ~ J
> >
>
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