hi all what happend if VAD is on? in this case there will be more get then put.. also, what happend if one clock is faster then the other? i ask because these are the kind of problem i am facing.. thanks jay 2009/7/3 Benny Prijono <bennylp at teluu.com> > On Wed, Jul 1, 2009 at 9:38 AM, ??? <shchoi at etri.re.kr> wrote: > >> Hi, all. >> >> I am studying Adaptive Jitter Buffer in pjsip. >> >> In pjsip code, >> >> /* States */ >> int jb_level; /**< delay between source & >> destination (calculated >> according >> of the number of burst get/put >> operations) >> */ >> >> I can't understand to calculate the delay by just GET/PUT operation >> How different is between that delay and E2E delay of real packet >> timestamp? >> >> > GET is called periodially every 20 ms (or whataver frame_ptime is). PUT is > called everytime frame arrives from the network. So if there is no jitter, > then the number of GET and PUT will be equal all the time (plus/minus one). > If there is jitter, then the jitter value is the difference between the > value of the two operations. > > The pro of this approach is it doesn't rely on wall time, and if there is > actually jitter in the GET operations too, then it will be accommodated by > the jbuf as well. > > > >> Is there a PAPER or a PATENT about adaptive jitter buffer algorithm >> implemented pjsip? >> >> > I'm not aware of that, and definitely I don't want to know about it! > > cheers > Benny > > > Thanks. >> >> Seunghan. >> >> >> _______________________________________________ >> Visit our blog: http://blog.pjsip.org >> >> pjsip mailing list >> pjsip at lists.pjsip.org >> http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org >> > > > _______________________________________________ > Visit our blog: http://blog.pjsip.org > > pjsip mailing list > pjsip at lists.pjsip.org > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20090703/e6101ba5/attachment.html>
