[Ekiga-devel-list] strange functioning jitter buffer

[alex <alexcordella gmail com>]

Hi all,
I'm run a set of measurements about playing delay of the jitter buffer 
in Opal, using a testbed. For taking out time values and seq number 
packets, I made light modifications in the file jitter.cxx (in 
particular in the function: PBoolean 
OpalJitterBuffer::ReadData(RTP_DataFrame & frame)) and rtp.cxx. These 
values were inserted in files .csv  (sending.csv contains time and seq 
num of packets transmitted, playout.csv those ones of packets played)

Plotting these  values  extracted,  I noticed an unusual behaviour of 
the playing delay:
1- presence of _discrete levels_ in both directions (caller-->callee, 
caller<--callee)
2- presence of a _drop_ only in uplink direction (caller-->callee)

Studying the debug file referring "no traffic" simulation, I observed a 
"periodic" resizing buffer.

- Could you help me to understand the adaptive algorithm used for 
resizing the buffer?

- Is it possible that there are two or more buffers implemented in Opal 
or that Ekiga has a particular equipment to equalize the playing delay?? 
Would you please  give me  any  advice/help/useful link??

Best regards,
Alex