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Common library for all Osmocom projects (libosmocore, libosmogsm, libosmovty, libosmogb, libosmosim, libosmousb, ...) https://osmocom.org/projects/libosmocore
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Mychaela N. Falconia 6e529a2c74 coding: gsm0503_tch_{fr,hr}_encode(): add ability to emit BFI 
Every BTS needs to have some graceful handling for the scenario
where it is time to send out a speech frame on TCH DL, but there is
no frame to be sent.  One possible solution is to transmit dummy
FACCH, but this option is unattractive for TCH/HS where FACCH
displaces two speech frames rather than one.  A more elegant
solution is to emit a speech frame with inverted CRC3, causing
the MS receiver to declare a BFI condition to its Rx DTX handler.
Setting all u(k) bits to 0 is one way to produce such an inverted-CRC
speech frame (normal TCH FR/HR CRC3 for an all-zeros frame would be
111), and this method is in fact what sysmoBTS PHY is observed to do.
Add the same ability to gsm0503_tch_{fr,hr}_encode() functions,
indicated by payload length of 0.

Change-Id: Iade3310e16b906efb6892d28f474a0d15204e861
 		2023-05-27 11:06:57 +00:00
contrib contrib/talloc_count.sh: improve hexadecimal masking 2023-03-14 20:12:57 +00:00
debian debian: set compat level to 10 2023-04-27 12:28:12 +00:00
doc merge_doc.xsl: move to osmo-gsm-manuals.git 2018-11-12 14:07:05 +01:00
include codec: new function osmo_hr_sid_reset() 2023-05-27 10:51:17 +00:00
m4 Add code coverage support 2019-11-30 02:17:23 +00:00
src coding: gsm0503_tch_{fr,hr}_encode(): add ability to emit BFI 2023-05-27 11:06:57 +00:00
tapset support for stats static userspace probes via systemtap 2021-02-22 09:58:00 +01:00
tests coding: fix _tch_csd_burst_map(): do not overwrite FACCH 2023-05-26 02:48:21 +07:00
utils gsm: fix convolutional code definition for TCH/F4.8 2023-05-25 19:08:53 +07:00
.gitignore New osmo-gsmtap-logsend utility 2023-03-15 11:53:08 +00:00
.gitreview add .gitreview 2016-05-19 06:39:13 +00:00
.mailmap Add .mailmap file for mapping mail addresses in shortlog 2016-08-08 13:12:17 +02:00
COPYING add GPL to project source 2010-02-21 09:21:30 +01:00
Doxyfile.codec.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.coding.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.core.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.ctrl.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.gb.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.gsm.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.isdn.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Doxyfile.sim.in doxygen: also generate documentation for libosmo{sim,usb} 2023-02-27 11:14:40 +00:00
Doxyfile.usb.in doxygen: also generate documentation for libosmo{sim,usb} 2023-02-27 11:14:40 +00:00
Doxyfile.vty.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
Makefile.am doxygen: also generate documentation for libosmo{sim,usb} 2023-02-27 11:14:40 +00:00
README.md update git URLs (git -> https; gitea) 2022-06-17 23:20:26 +02:00
TODO-RELEASE gsm0503_tch_hr_decode2(): new function, emits TS101318 format 2023-05-23 16:42:01 +00:00
configure.ac configure.ac: Fix typo in enable flag description 2023-03-14 13:13:40 +01:00
git-version-gen add git-version-gen magic to automatically generate package version 2010-03-23 00:30:19 +08:00
libosmocodec.pc.in clean-up pkg-config files: Make use of "Requires" as documented 2022-03-24 14:57:22 +00:00
libosmocoding.pc.in clean-up pkg-config files: Make use of "Requires" as documented 2022-03-24 14:57:22 +00:00
libosmocore.pc.in configure --enable-libmnl: Add libmnl to libosmocore.pc.in Requires 2023-01-25 17:12:07 +01:00
libosmoctrl.pc.in clean-up pkg-config files: Make use of "Requires" as documented 2022-03-24 14:57:22 +00:00
libosmogb.pc.in libosmogb.pc.in: Fix missing dependency on libosmogsm 2023-02-20 12:21:30 +01:00
libosmogsm.pc.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
libosmoisdn.pc.in create libosmoisdn sub-library 2023-01-21 22:41:57 +01:00
libosmosim.pc.in clean-up pkg-config files: Make use of "Requires" as documented 2022-03-24 14:57:22 +00:00
libosmousb.pc.in clean-up pkg-config files: Make use of "Requires" as documented 2022-03-24 14:57:22 +00:00
libosmovty.pc.in libosmo{gb,vty}.pc.in: Add talloc to 'Requires' 2022-03-25 09:45:42 +00:00
osmo-release.mk Fixup severe build performance issues 2017-10-04 16:26:37 +02:00
osmo-release.sh osmo-release.sh: Use variable containing bumpversion path everywhere 2022-01-05 23:09:17 +00:00

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