Linux-based open-source VOIP system LinPhone [2]

**************************************** **************************************** **************************************** ***
Author: EasyWave time: 2013.01.26

Category: Linux application LinPhone component oRTP Declaration: reprinted, please keep the link

NOTE: If any error occurs, please correct it. These are my Learning Log articles ......

**************************************** **************************************** **************************************** ***

In the LinPhone system, the first third-party library component we want to introduce: oRTP -- a Real-time Transport Protocol (RTP, RFC3550) library, oRTP is an open source real-time transmission protocol based on LGPL. For RTP, it is mainly used for real-time network transmission of audio and video. There are two methods: UDP and TCP. Now we will briefly introduce the basic functions of oRTP. In the future, we will also explain how to compile it in ARM-Linux and how to compile it in Windows. Go to oRTP to introduce the functions. The main functions are as follows:

• Code written in pure C can be run and transplanted on Linux and Windows.
• Based on RFC3550 (RTP: Real-time application transfer protocol), easy-to-use API functions, high-level and low-level access
• AV profile (RFC3551) is supported by default after multiple configuration files are included.
• Contains a packet scheduler to support receiving and sending packets on time. Based on their timestamps, scheduling is optional and RTP sessions can be maintained without scheduled.
• IO multiplexing is supported, allowing hundreds of RTP sessions to be scheduled by a single process
• The receiver of the adaptive jitter algorithm to adapt to the clock rate at the sending end.
• Support for telephone events in RFC2833
• Use doxygen API documentation
• Licensed under the GNU General Public License
• RTCP messages sent periodically since 0.7.0 (compound packet including sender report or javaser report + SDES) [it is not easy to translate. Use the original article]
• Contains an API for parsing the imported RTCP package

Download

• Releases of source tar.gz are
  Here.
• Use git, read only access: 

git clone git.linphone.org/ortp.git

Documentation

Read there: API documentation.

Authors

ORTP was written by Simon MORLAT (simon dot morlat at linphone dot org ).
More information is availlable in the source tree, see the README file.

Next, we will introduce the third-party libraries required by oRTP, LinPhone, and LinPhone, and introduce how to port them to ARM Linux.

Http://www.linphone.org/eng/documentation/dev/ortp.html:

Source code download: http://download.savannah.gnu.org/releases/linphone/ortp/sources/

API documentation download: http://download.savannah.gnu.org/releases/linphone/ortp/docs/