基于Android的视频通话系统的设计与实现毕业设计论文

东北大学毕业设计（论文）摘要基于Android的视频通话系统的设计与实现

摘要

近年来，智能手机操作系统发展迅速，尤其是Android系统的迅猛发展已经将全球智能手机市场引领到了非常火爆的状态。随着手机社交网络、手机多媒体通信和手机游戏等应用程序不断被开发出来，各种基于智能手机操作系统的应用程序正在逐渐影响和改变人们的生活方式。实时视频流技术在可视电话、远程教育、视频点播等方面得到了广泛的应用。

本文设计并实现的基于Android的视频通话系统采用C/S架构，包括PC和手机两个客户端。手机端使用Android2.3操作系统。本系统共包含四个子系统：PC端接收子系统、发送子系统，Android端接收子系统、发送子系统。接收子系统实现数据接收、转码和呈现，发送子系统现实数据采集、编码压缩和数据发送。PC端基于JMF框架来实现，Android端使用Android Camera类及其相关类来实现。本文对国内外视频通话的研究情况以及今后的发展前景，对实现视频通话所涉及到的协议和相关技术进行了分析，在此基础上提出了一种可行的网络视频通话设计方案，并通过需求分析、详细设计、编码实现、单元测试以及集成测试等过程完成了本系统的设计与实现。

本系统实现了跨平台视频通话，使PC与Android之间的视频通话成为了可能，可以起到丰富人们日常生活交流和娱乐方式的作用。

关键词：Android，视频通话，JMF，PC，RTP/RTCP

Design and Implementation of an Android-Based

Video Calling System

Abstract

In recent years, the rapid development of smart phone operating system, especially Android system, has led the global smart phone market into explosion state. With some application such as mobile social networking, mobile media communications and mobile games being continually developed, a variety of application on smart phone operation systems are increasingly affecting and changing people’s lifestyles. The real-time video streams technology is used widely in such aspects as videophone, distance education and video on demand.

The system based on android uses c/s architecture. It includes two clients. One is on the Windows system, the other one is on the Android 2.3 system. There are four subsystems. Each of clients has a send subsystem and a receiver subsystem. The main function of the receiver subsystem is to receiver data from internet and decodes that data. After that, it will display that data as soon as possible. The main function of the send subsystem is to collect data from camera and then encodes the data. After that, the data will be sanded to the Internet. On the PC client, we use the JMF framework. One the Android client, we use Android API. This paper firstly introduces the research condition of the video call and development tendency. It analysis some technologies about the video calling system and comes up with a feasible plan. It introduces the video calling system about requirement analysis, detailed design, realize and testing.

This system achieves the cross-platform video calling. It becomes possible to make video calling between PC and Android and will enrich the people’s communication and entertainment in their daily lives.

Key words: Android, video call, JMF, PC, RTP/RTCP

目录

摘要 ................................................................................................... I Abstract................................................................................................ II 第1章绪论 .. (1)

1.1 课题概述 (1)

1.1.1 课题背景 (1)

1.1.2 课题的目的及意义 (1)

1.2 国内外发展现状 (2)

1.3 研究内容 (2)

1.4 组织结构 (3)

第2章相关技术 (4)

2.1 Java多媒体框架 (4)

2.1.1 JMF的功能 (4)

2.1.2 JMF中的数据源 (4)

2.1.3 JMF中的媒体播放器 (4)

2.1.4 JMF中的媒体处理器 (5)

2.1.5 JMF中的事件模型 (6)

2.2 RTP/RTCP协议 (6)

2.2.1 RTP实时传输协议 (6)

2.2.2 RTCP实时传输协议 (8)

2.3 FFmpeg视频编解码技术 (9)

2.3.1 FFmpeg简介 (9)

2.3.2 组成 (10)

2.3.3 编码框架 (10)

2.3.4 解码框架 (11)

2.4 本章小结 (12)

第3章系统分析 (13)

3.1 需求分析 (13)

3.1.1 系统总体需求 (13)

3.1.3 用例分析 (14)