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 > (m.privategsm.com), consider that speex is VBR and VBR codecs are > not recommended for security reasons > (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 > > lists.xiph.org/mailman/listinfo/speex-dev > > > > _______________________________________________ > Speex-dev mailing list > Speex-dev at xiph.org > 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 I'll try to compile speex for Symbian (I see it's been ported, but the Symbian port is somewhat out of date?)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 > > (m.privategsm.com), consider that speex is VBR and VBR codecs are > > not recommended for security reasons ( > 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: lists.xiph.org/pipermail/speex-dev/attachments/20081210/66bcad2e/attachment.htm
Fabio Pietrosanti (naif)
2008-Dec-10 20:42 UTC
[Speex-dev] Speex on Nokia Symbian S60 phones
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: 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 > > (m.privategsm.com), consider that speex is VBR and VBR > codecs are > > not recommended for security reasons > (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 > (m.privategsm.com), consider that speex is VBR and VBR codecs are > not recommended for security reasons (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 -------------- next part -------------- An HTML attachment was scrubbed... URL: lists.xiph.org/pipermail/speex-dev/attachments/20081211/38de0675/attachment.htm
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