[Speex-dev] Speex realtime encoding/decoding "Real world" usage for Windows Mobile / Symbian device

Ashhar Farhan farhan at phonestack.com
Thu May 22 18:11:49 PDT 2008

hi all,
I can claim that our hotfoon service has run millions of mobile voip
minutes using speex on mobile and desktops. it works!
earlier you needed more powerful cpus (until the integer port),
however now the cpus are much faster and the code complexity is much
my only regret is of not being able to write some demo apps for speex
on win mob. I will surely deliver it in june to settle this debate.

- farhan

On 5/23/08, Jean-Marc Valin <jean-marc.valin at usherbrooke.ca> wrote:
> Fabio Pietrosanti (naif) a écrit :
>> However, AMR it's not royalty free and if i need to use it on Windows
>> Mobile i will need to pay a quite expensive royalty for each peace of
>> software distributed (not sold, distributed!!!).
> This is exactly why I wrote Speex!
>> So, i am evaluating other codes and the only real alternative capable of
>> running on a 9.6kb/s link seems to be speex.
> Correct.
>> Now, i discussed with several embedded VoIP implementators and some said
>> that Speex simply does not work on mobile devices.
> There's nothing magic about "mobile devices". Either the CPU is powerful
> enough or it isn't.
>> I got the feedback that Speex require too much computation power to run
>> on Symbian OS and Windows Mobile devices doing encoding/decoding in
>> realtime with all the Narrowband-enabled features.
>> I crawled the mailing list archive and the internet and i was not able
>> to find out a precise answer to my doubt.
> I remember several mentions on the mailing list of Speex running on
> Symbian and WinCE.
>> I would like to ask for REAL WORLD experience in using Speex for
>> encoding/decoding in realtime voice streams on mobile devices.
> ...as opposed to people with FAKE WORLD experience? ;-)
>> Does exists a Symbian OS product doing encoding/decoding in realtime
>> with speex?
>> Does exists a Windows Mobile product doing encoding/decoding in realtime
>> with speex?
>> Does anyone had real world experience with such kind of codec?
> Well, I know people who've used it on Symbian/ARM, TI C5X/C6X and I've
> personally ported it to the Blackfin DSP. It even runs on music players
> now with Rockbox and I've seen wifi phones that support it.
>> If not i understand that the speex code it's still not mature enough for
>> Mobile environment VoIP and audio streaming.
> You are free to understand what you like.
> 	Jean-Marc
> _______________________________________________
> Speex-dev mailing list
> Speex-dev at xiph.org
> http://lists.xiph.org/mailman/listinfo/speex-dev

More information about the Speex-dev mailing list