[Speex-dev] Speex realtime encoding/decoding "Real world" usage for Windows Mobile / Symbian device
jean-marc.valin at usherbrooke.ca
Thu May 22 16:02:40 PDT 2008
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.
> 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.
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