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We don't want to expose the details of a given ECU implementation to
the user (e.g. osmo-bts), but have a generic abstraction layer where
an ECU implementation can simply register a few call-back functions
with the generic core.
As the developer and copyright holder of the related code, I hereby
state that any ECU implementation using 'struct osmo_ecu_ops' and
registering with the 'osmo_ecu_register()' function shall not be
considered as a derivative work under any applicable copyright law;
the copyleft terms of GPLv2 shall hence not apply to any such ECU
implementation.
The intent of the above exception is to allow anyone to combine
third party Error Concealment Unit implementations with libosmocore,
including but not limited to such published by ETSI.
Change-Id: I4d33c9c7c2d4c7462ff38a49c178b65accae1915
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Change-Id: I64c6d3dc08ff87b673ba6225f98546e86f91bcfd
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Change-Id: I9620088e449c31e966ecb9ec5ddf283b949c5a4a
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
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As stated in its own documentation, reduce_xmaxcr_all() should only
return true when ALL XMAXC fields return true. However, previous
implementation returned true when at least one of them returned true.
As a result, if any of the sections is silent (for instance because one
of the bursts was lost), the whole frame is silenced, returning a zeroed buffer.
Related: OS#2700
Fixes: 40def49ac4b8babbd1b17c232137ce50a428706b ("libosmocodec: implement ECU (Error Concealment Unit) for FR")
Change-Id: I1624b7c6574f53d0593a61645d4fdc5d56cabe96
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When a bad GSM voice frame is received, it's being replaced
by a silence frame. This may cause unpleasant audio effects.
This change implements a functionality to craft a replacement
frame from the last known good frame. Currently, only FR is
supported, support for other codecs may be added latter.
Change-Id: I06a21f60db01bfe1c2b838f93866fad1d53fdcd1
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