Regis, Correct, I am using your implementation, good job! Thank you! But as I understand from SILK documentation (SILK SDK API pdf document), you should call this function SKP_Silk_SDK_search_for_LBRR to retrive lost frame from next (n+1 and n+2) frames. And in your implementation you never call this function. Regards, Oleg Lutsenko On May 25, 2012, at 4:51 PM, R?gis Montoya wrote: > Oleg, > > I guess that you use my implementation (http://code.google.com/p/csipsimple/source/browse/trunk/CSipSimple/jni/silk/pj_sources/silk.c) of silk codec. > > As far as I understood from silk codec api, the storage of previous frames is done by SILK itself. So the implementation I did is already valid to use FEC feature of SILK. > And for the few tests I did with SILK with my implementation it's already capable to retrieve lost frames. > > I could mistake however since I didn't spent a lot of time on the SILK implementation. But my guess are pretty confirmed by the Opus implementation I did later (opus is based on SILK + CELT). > > So normally, you have just nothing to do if you want to use FEC with pjsip + my codec implementation. > > Regards, > R?gis > > > Le 25 mai 2012 16:31, "Oleg Lutsenko" <oleg.lutsenko at googlemail.com> a ?crit : > Hi guys, > > I am going to use nice FEC (Forward Error Correction) feature of SILK codec, to recover lost frames. To use this feature I need to have access to the next two frames after the lost one. This two frames include redundant information about previous frame, so, potentially, its possible to recover the lost frame. > > pjmedia_codec_op struct has recover function which I need to implement: > > pj_status_t(* pjmedia_codec_op::recover)(pjmedia_codec *codec, unsigned out_size, struct pjmedia_frame *output) > > The problem I have right now, is that I have no idea how to get any frame around the lost one. Is there any way how to get specific frame in a stream? > > Regards, > Oleg Lutsenko > _______________________________________________ > 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
