Mediastreamer2 is a powerful and lightweight streaming engine for telephony applications. This media processing and streaming toolkit is responsible for receiving and sending all multimedia streams in Linphone, including media capture, encoding and decoding, and rendering.

BcToolBox is an utilities library used by Belledonne Communications software like belle-sip, mediastreamer2 and linphone.

Linphone is a SIP softphone for voice and video over IP calling (VoIP) and instant messaging. Amongst its features are:

• High Definition (HD) audio and video calls

• Multiple call management (pause and resume)

• Call transfer

• Audio conferencing (merge calls into a conference call)

• Call recording and replay (audio only)

• Instant Messaging with message delivery status (IMDN)

• Picture and file sharing

• Echo cancellation

• Secure user authentication using TLS client certificates

• SRTP, zRTP and SRTP-DTLS voice and video encryption

• Telephone tone (DTMF) support using SIP INFO or RFC 4733

• Audio codecs: opus, speex, g711, g729, gsm, iLBC, g722, SILK, etc.

• Video codecs: VP8, H.264 and H.265 with resolutions up to 1080P, MPEG4

BZRTP is an implementation of ZRTP keys exchange protocol, written in C. It is fully portable and can be executed on many platforms including both ARM and x86.

BcG729 is an implementation of both encoder and decoder of the ITU G729 speech codec. The library written in C 99 is fully portable and can be executed on many platforms including both ARM and x86 processors. It supports concurrent channels encoding and decoding for multi call application such as conferencing.

Belr is Belledonne Communications' language recognition library, written in C++11. It parses text inputs formatted according to a language defined by an ABNF grammar, such as the protocols standardized at IETF.

Liblinphone is a high-level SIP library integrating all calling and instant messaging features into an unified easy-to-use API. It is the cross-platform VoIP library on which the Linphone application is based on, and that anyone can use to add audio and video calls or instant messaging capabilities to an application.

BCUnit is a fork of the defunct project CUnit, with several fixes and patches applied. It is a unit testing framework for writing, administering, and running unit tests in C.

Belle-sip is a modern library implementing SIP transport, transaction and dialog layers. It is written in C, with an object-oriented API. It also comprises a simple HTTP/HTTPS client implementation.

MSSILK is a plugin of MediaStreamer, adding support for AMR codec. It is based on the Skype's SILK implementation.

GNU Linux-Libre is a free (as in freedom) variant of the Linux kernel. It has been modified to remove all non-free binary blobs.

fakeroot runs a command in an environment where it appears to have root privileges for file manipulation. This is useful for allowing users to create archives (tar, ar, deb, etc.) with files in them with root permissions and/or ownership.

Without fakeroot, one would have to have root privileges to create the constituent files of the archives with the correct permissions and ownership, and then pack them up, or one would have to construct the archives directly, without using the archiver.

This is the io_uring library, liburing. liburing provides helpers to setup and teardown io_uring instances, and also a simplified interface for applications that don't need (or want) to deal with the full kernel side implementation.

Headers of the Linux-Libre kernel.

Hotspot is a standalone GUI for performance data analysis. It aims to be similar to KCachegrind, but for data collected with perf, a profiler for use with the kernel Linux. Its main feature is graphically visualizing a perf.data file.

GNU Linux-Libre is a free (as in freedom) variant of the Linux kernel. It has been modified to remove all non-free binary blobs.

strace is a system call tracer, i.e. a debugging tool which prints out a trace of all the system calls made by a another process/program.

libnetfilter_cttimeout is the userspace library that provides the programming interface to the fine-grain connection tracking timeout infrastructure. With this library, you can create, update and delete timeout policies that can be attached to traffic flows. This library is used by conntrack-tools.

This simple Linux kernel module allows calls from user space to any ACPI method provided by your computer's firmware, by writing to /proc/acpi/call. You can pass any number of parameters of types ACPI_INTEGER, ACPI_STRING, and ACPI_BUFFER.

It grants direct and undocumented access to your hardware that may cause damage and should be used with caution, especially on untested models.

TLP is a power management tool for Linux. It comes with a default configuration already optimized for battery life. Nevertheless, TLP is customizable to fulfil system requirements. TLP settings are applied every time the power supply source is changed.

iptables is the user-space command line program used to configure the Linux 2.4.x and later IPv4 packet filtering ruleset (firewall), including NAT (Network Address Translation).

This package also includes ip6tables, which is used to configure the IPv6 packet filter.

Both commands are targeted at system administrators.

These are a set of utilities built upon sysfs, a virtual file system in Linux kernel versions 2.5+ that exposes a system's device tree. The package also contains the libsysfs library.

libnetfilter_cthelper is a userspace library that provides a programming interface to user-space connection tracking helpers.

1. register new user-space connection tracking helpers

2. unregister user-space connection tracking helpers

3. list existing registered user-space connection tracking helpers

This package provides a C library with C++ bindings and command-line tools for interacting with GPIO devices that avoids the usage of older system-wide /sys interface.