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

[Jonathan Rose]

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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


Repository: Asterisk


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.


Diffs
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  /team/group/media_formats-reviewed-trunk/channels/chan_iax2.c 418711 

Diff: https://reviewboard.asterisk.org/r/3800/diff/


Testing
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[lappy]
type=friend
...
disallow = all
allow = ulaw
allow = gsm
allow = alaw

context = default

[deskbox]
type=friend
...
disallow=all
allow=gsm
allow=alaw

context = default


Using these two peers, I had each call the other.

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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