RE: [GnomeMeeting-list] jitter buffer implementation

["Brijesh" <brijesh jadav einfochips com>]

Hi all,
Can someone tell me the use of targetJitterTime and currentJitterTime
variables in the jitter buffer implementation? I am not getting them.
Brijesh

-----Original Message-----
From: Craig Southeren [mailto:craigs postincrement com] 
Sent: Tuesday, February 07, 2006 10:39 AM
To: GnomeMeeting mailing list; brijesh jadav einfochips com
Subject: Re: [GnomeMeeting-list] jitter buffer implementation

On Tue, 7 Feb 2006 10:30:46 +0530
"Brijesh" <brijesh jadav einfochips com> wrote:

> Hi all
> I was looking into the code of the jitter buffer.
> I have doubt for the implementation. 
> suppose there are three packets 1,2,3 coming in the order 2 3 1 
> now suppose that after 2 packet, jitter time is over so 2 packet will go
to
> the play out. after 3 support 1 comes but 2 is already played out. so put
> function will put 1 packet to the beginning of the buffer. Now get
function
> us removing oldest packet from the list so that is 1 packet. So play out
> sequence will be 2, 1, 3.
> Am I right? Or how does implementation handles this situation?

In this situation, packet 1 will almost always be ignored, because there
is little chance it will arrive before packet 2 finishes playing.

More interesting in the case of packets arriving 1 3 2. In this case,
packet 2 will be played if it arrives before 1 finishes playing, but
will be ignored if arrives before 3 starts playing.

However, packet reordering occurs very rarely in the real world. The
jitter buffer is mostly to deal with the varying transit times of
packets over the wire.

   Craig

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