Andrew Kohlsmith [EMAIL PROTECTED] wrote:
> [EMAIL PROTECTED] wrote:
> > My qualification is having worked on the IAX2 jitter buffer,
> > consequently having studied how audio flows from the received frames
> > through the jitter buffer and then via ast_translate() into the codec.
> >
> Hmm... having worked on the IAX2 jitter buffer, can you tell us why
> trunking and jitter buffers don't get along? When trunking with nufone I
> get ... interesting... audio if I have a jitter buffer enabled. :-)
>
Getting back to loss concealment for a moment, it seems to me that we
could do something like the following:
* Every 20ms, call a scheduled function that inserts a "silent"
voice frame into the stream. The frame would be marked as
"bogus" in some way and would be timestamped appropriately.
* The jitter buffer should then remove the "duplicate" voice
frames, leaving a constant 20ms stream of either voice data
or silence.
* The individual codecs should then either spot the frame's
"bogus" marker and deal with it as a dropped frame or, if the
codec can't do reconstruction, process the frame as silent audio.
I expect that a silent frame would sound much the same as a
dropped frame (with no reconstruction) anyway.
Does that sound feasible with the current framework? My initial
inspection of the SIP/IAX2 code says that it should be, although
it'd introduce a fair amount of overhead.
--
_/ _/ _/_/_/_/ _/ _/ _/_/_/ _/ _/
_/_/_/ _/_/ _/ _/ _/ _/_/ _/ K e v i n W a l s h
_/ _/ _/ _/ _/ _/ _/ _/_/ [EMAIL PROTECTED]
_/ _/ _/_/_/_/ _/ _/_/_/ _/ _/
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