[asterisk-dev] [Code Review] Adjust formats of chan_local when channel we proxying changes

[David Vossel]

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/trunk/channels/chan_local.c
<https://reviewboard.asterisk.org/r/1137/#comment8606>

    This kind of constant checking of the format fields would work, but it is very expensive to do this on every audio frame.  Isn't there a way we can detect if we start getting a different audio format than we did in the past and use that to trigger that something needs to be updated?



/trunk/channels/chan_local.c
<https://reviewboard.asterisk.org/r/1137/#comment8602>

    don't do this :)


- David


On Sept. 29, 2011, 9:43 a.m., irroot wrote:
> 
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> (Updated Sept. 29, 2011, 9:43 a.m.)
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> 
> Review request for Asterisk Developers and David Vossel.
> 
> 
> Summary
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> 
> This is a most annoying pain and tripped me up no end testing the T38 gateway patch for res_fax.
> 
> Scenario :-
> 
> i have a Linksys 2102 on a fax machine that uses G.729 and switches to ALAW on CNG and then negotiates T.38
> this is awesome as i can now Chat/Fax from same terminal using most effective bandwidth [these are to be deployed
> on sugar cane farms surrounding the kruger park here in south africa over wi-fi]
> 
> for testing purposes im using a local channel into T.30 fax app in res_fax.
> 
> Problem :-
> 
> when the device reinvites ALAW then T.38 it leaves the nativeformat on chan_local as G.729 this will not work
> as it is transcoding the FAX from G.729 to SLIN this will not work and took me a while to spot the problem.
> 
> Soloution :-
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> Check the format on the proxy and adjust it if it changes this should be what Local does been a proxy of the channel
> it should follow changes ...
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> 
> Diffs
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>   /trunk/channels/chan_local.c 338435 
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> Diff: https://reviewboard.asterisk.org/r/1137/diff
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> 
> Testing
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> 
> Thanks,
> 
> irroot
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>

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