Benny Prijono wrote: > Well basically almost *all* PJMEDIA features will be unavailable. The > only things that are still usable are things related to transport, > such as RTP/RTCP packetization, jitter buffer, and SRTP. mmm maybe sounds good, jitter buffering and packetization are the only things really missing from the Nokia libraries! > > Benny, Nanang am i right or not? > > > Actually I'm not sure. We tested AMR with the built in SIP user agent > in Nokia E90, and from Nokia there doesn't seem to be any VAD/DTX, > while from pjmedia there is. With casual tests, the average bitrate > from pjmedia is only about 2.6Kbps (since we use the 4.75Kbps mode), > while from Nokia it's over 12Kbps. This doesn't say if VAD/DTX feature > is not present, but at least it's not enabled by default, while in > pjmedia it is. Oh yes, but i am not talking about the built-in SIP use agent. They use AMR-WB at 12kbps without DTX. From the APS you can specify that you want AMR 4.75 samples with VAD/DTX (going to 2.6kb) and get it. At the same time you can provide samples with SID describing silence with CNG and will be up to the APS to play it the right way. The missing things is the jittering buffering that's not provided in any library by Nokia, but that's provided by pjsip right? > It shouldn't be too difficult to use device's codec with pjmedia, one > just need to replace the stream implementation with a different one, > leveraging the RTP/RTCP packetization and jitter buffer components > that are already provided in pjmedia. Something like that. Sounds cool! Manoj ?
