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[Linphone-developers] Question about slide

From: Julien Chavanton
Subject: [Linphone-developers] Question about slide
Date: Mon, 2 Dec 2013 12:14:15 +0100


I am trying to understand why the "slide" is fluctuating so much under
significant jitter.

Question 1: In the algorithm impemented in Linphone, the slide is
trying to represent the difference between the sender time-stamp and
the receiver timestamp (+latency) ?

        "slide: an average of difference between the expected and the
socket-received timestamp"

Question 2: Instead of putting so much weight on the last packet = 1%,
shouldn't we do a real average ?

Question 2.2: Or why not taking the lowest value observed in "diff"
between local and sender TS ? (We do not trust to remote clocking ?)

Question 3: Reading :

        "slide is used to make clock-slide detection and correction."

Do we suspect remote phone will change it's clocking source and jump
in the futur or the past and this is why we can not trust it ?

thank you

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