>> We have integrated G729 codec with PJSIP 0.7.0 (revision 1538) and media >> flow works fine for 1 call at a time. However, if we make multiple (even >> 2) >> G729 calls in parallel the media becomes very choppy and choppiness seems >> to >> increase with increasing number of parallel G729 calls. The root cause of >> the problem seems to be the fact that encoding and decoding happen in a >> single thread for all the calls (I printed out thread IDs in the encode >> and >> decode routine of G729 - thread ID was same). The small verification I >> did >> was that I placed 2 parallel (G729) calls and heard choppy media. On >> plaving >> of the calls on hold the choppiness dissappeared and reappeared when the >> held call was unheld. >> > > When conference bridge is used, then most media processing will be > done in the context of the sound device thread indeed, because audio > sources need to be mixed at the same time. > > Are you really tight on CPU? If so, then perhaps this was caused by > the lack of power to run more than one simultaneous G729 calls rather > than encode/decode being done in a single thread. > I dont think I am tight on CPU. I have a Centrino Duo @2GHz with a GB of RAM. BTW, I do see these frequently in the log file. 13:33:33.750 splitcomb.c Overflow in downstream direction 13:33:33.750 splitcomb.c Underflow in upstream direction Any suggestion/hints on what could be causing this? Regards, Anshuman >> I tried increasing the number of worker threads being created in >> endpoint.c >> to no effect. I was contemplating of how to put encode and decode in >> seperate threads. Maybe Benny or someone whose faced a similar problem >> could >> give some suggestions? >> > > You can create a media port with a worker thread in it, so that: > - when get_frame() is called on this port, you call get_frame() to the > stream. > - when put_frame() is called, you copy the frame and instruct the > worker thread to call put_frame() to the stream. > > Then instead of registering the stream to the bridge, you register > this port to the bridge instead. > > cheers, > -benny > > >> Thanks, >> Anshuman > > _______________________________________________ > 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 > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.19.19/1256 - Release Date: 2/2/2008 > 1:50 PM > >
