Speex dev - Dec 2008 - Speex on Nokia Symbian S60 phones

Quoting "Fabio Pietrosanti (naif)" <lists at
infosecurity.ch>:
> Speex it's too cpu expensive for general S60 usage, it would require a
> lot of ASM optimization.
Did a quick search and saw ARM CPUs with speeds above 100 MHz. That should
actually be enough for Speex, at least for narrowband.
> 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) .
Except that Speex *defaults* to CBR and only uses VBR when told to do so.

   Jean-Marc
> Regards,
> Fabio Pietrosanti
>
> Jordan Dimov wrote:
> > Is speex at this stage a good codec to use for real-time voice
> > transmission over a direct CSD connection between two phones?  Does
> > anyone have any experience with using Speex on Nokia phones?
> >
> > If speex is not a good solution for this task, what would you
recommend?
> >
------------------------------------------------------------------------
> >
> > _______________________________________________
> > Speex-dev mailing list
> > Speex-dev at xiph.org
> > http://lists.xiph.org/mailman/listinfo/speex-dev
> >
>
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev
>
>

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been ported, but the Symbian port is somewhat out of date?)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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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 :(

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
>

Just in case I'll state the obvious: make sure you compile with
FIXED_POINT defined.


Cheers,
Dave 

 

From: speex-dev-bounces at xiph.org [mailto:speex-dev-bounces at xiph.org] On
Behalf Of Jordan Dimov
Sent: Thursday, 11 December 2008 6:57 AM
To: Jean-Marc Valin
Cc: speex-dev at xiph.org
Subject: Re: [Speex-dev] Speex on Nokia Symbian S60 phones

 

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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