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
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