Linphone学习目标

Description

Linphone is an open source SIP Phone, available on mobile and desktop environments (iOS, Android, Windows Phone 8, GNU/Linux, Windows Desktop, MAC OSX) and on web browsers.
Linphone has inside a separation between the user interfaces and the core engine, allowing to create various kinds of user interface on top of the same functionalities.
The user interface frontends:Gtk+ interface for windows, mac and GNU/Linux
The console interface (linphonec, linphonecsh)
The iPhone application built in objective C
The Android application running in java
The Windows Phone application written in C#

Liblinphone, the core engine: this is the library that implements all the functionalities of Linphone.Liblinphone is a powerful SIP VoIP video SDK that anyone can use to add audio or video call capabilities to an application. It provides a high level api to initiate, receive, terminate audio & video calls.
Liblinphone relies on the following software components:Mediastreamer2, a powerful multimedia SDK to make audio/video streaming and processing.
oRTP, a simple RTP library.
belle-sip the SIP library.

Liblinphone and all its dependencies are written in pure C.

Architecture

上图是最新的官方网站提出来的架构图，具有很高的价值。

Architecture

这张图是linphone3.3.2的架构图，

系统运行框图

这张图是系统运行框图，新版本跟老版本应该不会有太大的变化，毕竟已经是很多年的老程序了，应该是通用的。

linphone中各个模块的说明：

1. Callback模块
2. Genera_stat模块：
3. Address模块
4. Authorization模块
5. Chat模块
6. Friends模块
7. Configure模块
8. Offer_answer模块
9. Presence模块
10. Proxy模块
11. Sql模块
12. Core模块

几个关键数据结构之间的关系

底层模块

1. Mediastream
2. ortp

linphone中数据结构说明