[asterisk-dev] [Code Review] 3800: media formats: chan_iax2 - Obey preferred codec order when selecting format for calls

[Corey Farrell]

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Before you commit be sure you can recompile against the latest revision, r3822 has been committed. This renamed ast_codec_pref* to iax2_codec_pref and a couple of the ast_format_compatibility_* to iax2_format_compatibility.

- Corey Farrell


On July 15, 2014, 6:28 p.m., Jonathan Rose wrote:
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> https://reviewboard.asterisk.org/r/3800/
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> (Updated July 15, 2014, 6:28 p.m.)
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> 
> Review request for Asterisk Developers, Joshua Colp, Matt Jordan, and opticron.
> 
> 
> Bugs: ASTERISK-23958
>     https://issues.asterisk.org/jira/browse/ASTERISK-23958
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> Repository: Asterisk
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> Description
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> At some point in the media_formats work, the function edited in this patch was modified in a way that left it abandoning the preference order of the codecs and just choosing from the first value in the codecs bitfield.  This patch changes that function to evaluate using the preferred codecs order.
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> Diffs
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>   /team/group/media_formats-reviewed-trunk/channels/chan_iax2.c 418711 
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> Diff: https://reviewboard.asterisk.org/r/3800/diff/
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> Testing
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> [lappy]
> type=friend
> ...
> disallow = all
> allow = ulaw
> allow = gsm
> allow = alaw
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> context = default
> 
> [deskbox]
> type=friend
> ...
> disallow=all
> allow=gsm
> allow=alaw
> 
> context = default
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> 
> Using these two peers, I had each call the other.
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> lappy -> deskbox
> Asterisk 11: Codec chosen for lappy was ulaw.  Codec chosen for deskbox was alaw, presumably because of favorable transcoding costs.
> without patch: Codec chosen for both was gsm in spite of preferred order for lappy favoring ulaw
> with patch: Codec chosen for lappy was ulaw. Codec chosen for deskbox was alaw, again presumably because of favorable transcoding costs.
> 
> deskbox -> lappy
> It was GSM for both endpoints in all cases because deskbox favors gsm and lappy supports it.
> 
> 
> Thanks,
> 
> Jonathan Rose
> 
>

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