android系统无线视频流媒体接收 解码与播放word格式论文.docxVIP

优秀毕业论文 精品参考文献资料 摘要 摘 要 Android 系统自问世以来就迅猛发展，并迅速占据着移动终端的主导地位。 随着 Android 系统发展以及移动终端的应用需求的增长，Android 平台的应用开 发越来越丰富。Android 系统的不断更新使得它更支持用户或程序员直接利用 系统资源在应用层开发。然而，Android 系统本身的局限性在一定程度上束缚 了应用程序的多功能化和可扩展性。 本文从不同层次上对 Android 流媒体播放器进行研究和开发。由于 Android 系统带有自身的媒体框架，且在不同层面上开放，包括已有的媒体框架—— OpenCore，以及基于 OpenCore 封装的 Media 库，因此本文针对 Android 系统 的三层架构，基于最接近应用层的 Media 库、原生的 OpenCore、第三方移植的 FFmpeg 开发流媒体播放器。由于 Media 库是以 OpenCore 为基础封装的，因此 使用 Media 库开发时，主要是在应用层的设计及对库的调用，其开发出的播放 器性能也因底层的固化而受局限。虽然 OpenCore 本身支持格式较少，但是直 接基于它开发可以减少一些无需或无关的文件，简化系统，减少对内存的占用。 而使用的第三方移植的流媒体解决方案，可以根据我们的需要，同时满足支持 较多的格式和减少内存的占用。本文选择功能强大，移植性强的 FFmpeg 进行 开发，通过剪裁、优化、编译、移植，实现了一套完整的、精简的 Android 流 媒体播放方案。 关键词：Android 流媒体 Opencore FFmpeg I Abstract Abstract Android system developed rapidly since it was born quickly occupied the dominant position of the mobile terminal. With the development of the Android system and the growth of mobile terminal application, the development of Android application platform increased diversely. Constantly updated Android system makes it develop directly in the application layer through direct using of system resources by user or programmer. However, Android system itself bound the limitations of the application of multi-functional and scalability to some extent. This thesis research and develop Android streaming media player in different levels. Because Android system have its own media framework and open at different levels, including the existing media framework - OpenCore, and based on OpenCore Media library package , so in this thesis, for Android’s three-tier framework, develop streaming media player based on media Library which closest to application layer, a native OpenCore and FFmpeg from third-party. Because OpenCore Media library is based on the package, so, when develop with Media library is about design of the application layer and the call to the library，as a result, the function of media player will be confined. Although OpenCore supports fewer formats,but based on it, can