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
This change defines the GSM FR bit positions as described
in RFC 3551, which will be used by further ECU
(Error Correction Unit) implementation.
Change-Id: I1d0a198af0f8dd1f690b5a81f5c9eb92c43aefed
There are some projects, such as OsmoBTS and OsmocomBB, which
are dealing with raw TCH payloads, so they need to have the
FR/HR/EFR frame length defined. At the moment, each project
defines them itself. Let's share these definitions.
Change-Id: Ib19dd1bf81712d034157f9ce061008be0000ef38
Considering the various styles and implications found in the sources, edit
scores of files to follow the same API doc guidelines around the doxygen
grouping and the \file tag.
Many files now show a short description in the generated API doc that was so
far only available as C comment.
The guidelines and reasoning behind it is documented at
https://osmocom.org/projects/cellular-infrastructure/wiki/Guidelines_for_API_documentation
In some instances, remove file comments and add to the corresponding group
instead, to be shared among several files (e.g. bitvec).
Change-Id: Ifa70e77e90462b5eb2b0457c70fd25275910c72b
Especially for short descriptions, it is annoying to have to type \brief for
every single API doc.
Drop all \brief and enable the AUTOBRIEF feature of doxygen, which always takes
the first sentence of an API doc as the brief description.
Change-Id: I11a8a821b065a128108641a2a63fb5a2b1916e87
Add convenience function osmo_amr_is_speech() to check if given AMR
frame is speech frame: non-speech frames often require special
processing.
Change-Id: Ifaab02a2f581acc302b367d34fd2fc28a4d1e2e3
Add functions which check if given FR or HR frame (packed in RTP)
contains SID (SIlence Descriptor) and corresponding tests.
Related: OS#22
Change-Id: I4051e3c0d4fb9ee93d7e9e0ef4abaf9f18e227ca
Reviewed-on: https://gerrit.osmocom.org/160
Tested-by: Jenkins Builder
Reviewed-by: Harald Welte <laforge@gnumonks.org>
* add functions to encode/decode various codec paramters from RTP payload with
AMR frame according to RFC 4867
* those functions are extended version based on code from osmo-bts'
amr.c by Andreas Eversberg
* add corresponding enum types and strings for logging
* add regression tests
It's useful both to replace manual parsing in osmo-bts with fuctions
covered by test suite and as a debugging helpers for issues related to
AMR.
Change-Id: Ia217679a07d3fbc970f435e20f6eac33d34bd597
Related: OS#1562
Reviewed-on: https://gerrit.osmocom.org/118
Tested-by: Jenkins Builder
Reviewed-by: Holger Freyther <holger@freyther.de>
When declaring them constant, they are written on the .rodata section
instead of .data, which means that they can be mapped directly from
disk to memory.
Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
There is no real reason to keep the include directory a multi-level
recursion, so instead declare everything within include (so that we
can use proper nobase_ declarations) and be it.
Please note that since we removed the sub-Makefile.am, ./configure
will not create the directory structure for us on out-of-tree builds,
so we have to make sure the directory we're generating to exists first.
Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
Philipp Maier
Vadim Yanitskiy
Neels Hofmeyr
Harald Welte
Sylvain Munaut