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Review request for Asterisk Developers.


Bugs: ASTERISK-21777 and ASTERISK-24380
    https://issues.asterisk.org/jira/browse/ASTERISK-21777
    https://issues.asterisk.org/jira/browse/ASTERISK-24380


Repository: Asterisk


Description
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Given a source capability of h264 and ulaw, a destination capability of
h264 and g722 then ast_translator_best_choice() would pick h264 as the
best choice even though h264 is a video codec and Asterisk only supports
translation of audio codecs.  When the audio starts flowing, there are
warnings about a codec mismatch when the channel tries to write a frame to
the peer.

* Made ast_translator_best_choice() only select audio codecs.

* Restore a check in channel.c:set_format() lost after v1.8 to prevent
trying to set a non-audio codec.

This patch is a partial fix for ASTERISK-21777 as the v11 version of
ast_translator_best_choice() does the same thing.  However, chan_sip
somehow sets the nativeformats capabilities to just h264 or empty.


This patch will be backported to v11 as a partial fix for ASTERISK-21777.


Diffs
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  /branches/13/main/translate.c 434447 
  /branches/13/main/channel.c 434447 

Diff: https://reviewboard.asterisk.org/r/4605/diff/


Testing
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Modified chan_pjsip.c:chan_pjsip_new() to force inclusion of the h264
video codec in the native capabilities.  Without the patch I get the path
translation warnings.  With the patch I don't get the warnings.


Thanks,

rmudgett

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