Hi, Agree for G711, but from our tests, it was not possible to get/write PCM audio in real time from the BB. Cheers
2011/1/12 Dragos D <[email protected]> > I think you can encode pcmu in Java in real-time. > On Jan 12, 2011 1:45 PM, "Kristian Kielhofner" <[email protected]> wrote: > > On Wed, Jan 12, 2011 at 12:48 PM, Jehan Monnier > > <[email protected]> wrote: > >> > >> As BB applications are pure java, it is nearly impossible to > encode/decode voice at the application level. For audio encoding, we rely on > what RIM provides. So far only AMR-NB is available in realtime. Today, we > think the best is use "server based" transcoding. We are thinking about > providing a server with transcoding capabilities. > >> > > > > Ideally you wouldn't want to implement this server as a standalone > > component because the delay and potential issues introduced by another > > device proxying the RTP could have a serious impact on call quality. > > Implementing transcoding to/from AMR on the final host providing the > > service is no different than transcoding ilbc or anything else > > (assuming you're going to G711u/a). > > > > For the server you may want to look at Sangoma hardware transcoding > boards: > > > > http://www.sangoma.com/products/hardware_products/transcoding.html > > > > They're supported by Asterisk and FreeSWITCH today (although I'm not > > sure AMR-NB is available from the codec API). I've found that > > licensing and indemnifying patented codecs such as G729 and AMR isn't > > really worth it in many cases. If you were to research licensing for > > a software implementation you'd find it's quite the hassle. > > > > These boards are often cheaper than their software counterparts > > (depending on volume) and offload the transcoding from the host CPU > > which is a significant advantage if you intend on large call volume. > > > > -- > > Kristian Kielhofner > > http://www.astlinux.org > > http://blog.krisk.org > > http://www.star2star.com > > http://www.submityoursip.com > > http://www.voalte.com > > > > _______________________________________________ > > Linphone-users mailing list > > [email protected] > > http://lists.nongnu.org/mailman/listinfo/linphone-users > > _______________________________________________ > Linphone-users mailing list > [email protected] > http://lists.nongnu.org/mailman/listinfo/linphone-users > > -- Jehan Monnier www.linphone.org
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