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
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