摘要
ASF文件是Microsoft公司Windows Media Technology信息流式播放方案的核心，也是远程教育中使用较多的多媒体格式，ASF文件在逻辑上由头对象、数据对象和索引对象构成。文章详细分析了ASF文件格式，通过图解的方式介绍了ASF文件的解析流程和ASF格式数据传输方式，最后实现了基于Windows Media流媒体实时传输系统，并给出了ASF流格式服务器端和客户端的实现方法。ASF文件的数据传输速率可以在28．8kb／s到3Mb／s之间变化，用户可以根据自己应用环境和网络条件选择合适的速率，实现VOD点播和实时直播，在解决好流媒体同步的基础上可实现远程教育，具有较大的应用和发展潜力。
As a streaming media format, ASF is the core of Windows Media Technology and the widely used in the distance learning. Each ASF file is composed of header object, data object and index object. Analyse ASF files format in details, and then introduce the parse course and the way of data transmission of ASF by graphical presentation, finally implement the system based on real - time windows media transmission and present the way of realizing the server and the client of ASF files format. The data transfer rate of ASF may change between 28.8kb/s and 3Mb/s, the user can realize VOD order programme and real - time broadcast by choosing right rate according to application environment and network condition. It is possible to realize distance learning after solving media synchronization. ASF has big application and development potential.
出处
《计算机技术与发展》
2009年第12期209-212,216,共5页
Computer Technology and Development
基金
海南省自然科学基金项目（807002）
