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channel.c: Allow generic plc then channel formats are equal

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If the two formats on a channel are equal, we don't transcode and since
the generic plc needs slin to work, it doesn't get invoked.

* A new configuration option "genericplc_on_equal_codecs" was added
  to the "plc" section of codecs.conf to allow generic packet loss
  concealment even if no transcoding was originally needed.
  Transcoding via SLIN is forced in this case.

ASTERISK-27743

Change-Id: I0577026a179dea34232e63123254b4e0508378f4
This commit is contained in:
George Joseph
2018-03-16 09:19:11 -06:00
parent 5843a19797
commit 5d097f8236
6 changed files with 35 additions and 4 deletions
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9
configs/samples/codecs.conf.sample
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@@ -64,8 +64,15 @@ experimental_rtcp_feedback => false
[plc]
; for all codecs which do not support native PLC
; this determines whether to perform generic PLC
; there is a minor performance penalty for this
; there is a minor performance penalty for this.
; By default plc is applied only when the 2 codecs
; in a channel are different.
genericplc => true
; Apply generic plc to channels even if the 2 codecs
; are the same. This forces transcoding via slin so
; the performance impact should be considered.
; Ignored if genericplc is not also enabled.
genericplc_on_equal_codecs => false
; Generate custom formats for formats requiring attributes.
; After defining the custom format, the name used in defining