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Hi all,
I cannot exactly understand what is the purpose of the
PresentationTimeSessionNormalizer used in live555ProxyServer.
As far as I can see, the presentation time of the incoming frames are
adjusted (as long as they have been synced with a RTCP Sender Report) by
adding an offset, which is computed at the beginning as the difference
from the current presentation time (fromPT) and the local wall clock
time (timeNow). Once this adjustment is done, the sending of RTCP Sender
Report on the downstream RTP sink is enabled.
But the NTP timestamp contained in a RTCP Sender Report packet is anyway
constructed from a wall clock time, via gettimeofday(), so its contents
does not depend on the actual frame presentation time. On the other
hand, the RTP timestamp in each RTP packet, even if computed starting
from the frame presentation time, is relative, so it should not depend
on any adjustment.
May be there is something missing in the picture...
Thanks in advance,
Massimo
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