Gitiles
Code Review Sign In
gerrit.osmocom.org / libosmocore / c87c6a3a7367e4a5ec14fb91b3470d475929eb0f
commitc87c6a3a7367e4a5ec14fb91b3470d475929eb0f[log] [tgz]
authorSylvain Munaut <tnt@246tNt.com>Fri Jul 07 15:57:32 2023 +0200
committerSylvain Munaut <tnt@246tNt.com>Fri Jul 07 16:06:26 2023 +0200
tree68ae07af93698d692b1fc4d1ce07781c90cfc867
parentc27a8ae3d915ae93505a040d060f4f619a19ce94 [diff]
gsm: Improve the TCH/H2.4 coding routines

The spec isn't super clear, but basically the conv coding is done
in two blocks of 72 bits.

The way it's currently implemented isn't "wrong" in the sense it will
produce correct output given no bit errors, but it's better to do the
decoding in two blocks because this then it makes use of the fact we
know the state of the encoder after the 72 bits, which improves the
corrective ability of the code.

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Id2551ffe2a0ebfd0a6df0e1d288a6f0af7e1eda7
4 files changed
tree: 68ae07af93698d692b1fc4d1ce07781c90cfc867
  1. contrib/
  2. debian/
  3. doc/
  4. include/
  5. m4/
  6. src/
  7. tapset/
  8. tests/
  9. utils/
  10. .checkpatch.conf
  11. .gitignore
  12. .gitreview
  13. .mailmap
  14. configure.ac
  15. COPYING
  16. Doxyfile.codec.in
  17. Doxyfile.coding.in
  18. Doxyfile.core.in
  19. Doxyfile.ctrl.in
  20. Doxyfile.gb.in
  21. Doxyfile.gsm.in
  22. Doxyfile.isdn.in
  23. Doxyfile.sim.in
  24. Doxyfile.usb.in
  25. Doxyfile.vty.in
  26. git-version-gen
  27. libosmocodec.pc.in
  28. libosmocoding.pc.in
  29. libosmocore.pc.in
  30. libosmoctrl.pc.in
  31. libosmogb.pc.in
  32. libosmogsm.pc.in
  33. libosmoisdn.pc.in
  34. libosmosim.pc.in
  35. libosmousb.pc.in
  36. libosmovty.pc.in
  37. Makefile.am
  38. osmo-release.mk
  39. osmo-release.sh
  40. README.md
  41. TODO-RELEASE
README.md

libosmocore - set of Osmocom core libraries

This repository contains a set of C-language libraries that form the core infrastructure of many Osmocom Open Source Mobile Communications projects.

Historically, a lot of this code was developed as part of the OpenBSC project, but which are of a more generic nature and thus useful to (at least) other programs that we develop in the sphere of Free Software / Open Source mobile communications.

There is no clear scope of it. We simply move all shared code between the various Osmocom projects in this library to avoid code duplication.

The libosmocore.git repository build multiple libraries:

  • libosmocore contains some general-purpose functions like select-loop abstraction, message buffers, timers, linked lists
  • libosmovty contains routines related to the interactive command-line interface called VTY
  • libosmogsm contains definitions and helper code related to GSM protocols
  • libosmoctrl contains a shared implementation of the Osmocom control interface
  • libosmogb contains an implementation of the Gb interface with its NS/BSSGP protocols
  • libosmocodec contains an implementation of GSM voice codecs
  • libosmocoding contains an implementation of GSM channel coding
  • libosmosim contains infrastructure to interface SIM/UICC/USIM cards

Homepage

The official homepage of the project is https://osmocom.org/projects/libosmocore/wiki/Libosmocore

GIT Repository

You can clone from the official libosmocore.git repository using

git clone https://gitea.osmocom.org/osmocom/libosmocore

There is a web interface at https://gitea.osmocom.org/osmocom/libosmocore

Documentation

Doxygen-generated API documentation is generated during the build process, but also available online for each of the sub-libraries at https://ftp.osmocom.org/api/latest/libosmocore/

Mailing List

Discussions related to libosmocore are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.

Please observe the Osmocom Mailing List Rules when posting.

Contributing

Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards

We us a gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details

The current patch queue for libosmocore can be seen at https://gerrit.osmocom.org/#/q/project:libosmocore+status:open