[Asterisk-Dev] rtp jitterbuffer synchronization question

[Steve Kann]

Slav Klenov wrote:

> Hello * core developers,
>
> Currently I'm working on jitterbuffer integration in rtp.c. My 
> previous experience with chan_sip jb
> integration showed some synchronization issues, so I'm trying to be 
> very careful with this now.
>
> Basicly what I'm doing is:
> - from chan_sip (in example) create an rtp in callback mode which adds 
> rtpread() into the chan_sip
>  io context - rtpread() will be always invoked from 
> chan_sip::do_monitor(), right?
> - rtpread(), when invoked, puts frames into the jitterbuff.
> - I have another function, which is scheduled to get frames from the 
> jitterbuff and delivers them
>  to the channel.
>
> The problem is that all these activities should be stopped when the 
> channel is distroyed (or maybe
> even earler - on hangup or when the network socket is closed???)
>
> My question is:
> Is it possible (not only for chan_sip, but for all rtp channels) 
> rtpread() to be invoked after
> rtp_destroy()?


It seems that rtpread will end up being called from ast_io_wait, which 
presently gets called from chan_sip.   I suppose it could get called 
after rtp_destroy only if a packet arrives on the UDP socket associated 
with the io record, and the rtp io record is still there, but it seems 
the record gets removed in ast_rtp_destroy.


>
> Thanks,
> Slav
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