嵌入环境下面向PVR应用的文件系统的设计与实现
文献类型：学位论文
| 作者 | 彭红卿 |
| 学位类别 | 博士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 中国科学院声学研究所 |
| 关键词 | 文件系统 个人视频录像机 嵌入式 机顶盒 特技模式 |
| 其他题名 | The Design and Implementation of File System for PVR in Embedded System |
| 中文摘要 | 个人视频录像机是将硬盘与机顶盒相结合而出现的产物，它既可以用于接收并观看节目也可以将节目以数字格式保存在本地硬盘中，它除了具有与传统模拟录像机相同的功能外还引入了时移播放等新的特性，极大地方便了使用者。随着技术和市场的发展，在机顶盒中加入数字录放功能已成为一种趋势。在个人视频录像机中，需要对硬盘上存储的文件和硬盘本身进行有效的管理，因而一个高效简洁的文件系统就必不可少了。目前与个人视频录像机的文件系统有关的信息相当少，设计并实现一个这样的文件系统就成了主要难点和任务之一。本文首先回顾了文件系统相关理论，对典型文件系统进行了介绍和分析，总结出在个人视频录像机中实现文件系统的特殊性，接下来探讨了移植和改进现有嵌入式文件系统和个人计算机所用文件系统作为专用文件系统的可能性，归纳出设计适合嵌入式环境的文件系统时所应遵循的原则，并以此为基础设计了私有文件系统PFs。文中详细解释了确定PFS主要数据结构和关键参数的依据，重点讲述了硬盘驱动程序和PFS主要接口函数的实现细节。文章还介绍了如何基于PFS在特定平台上实现时移等个人视频录像功能以及如何解决在播放过程中的音视频同步问题，对快进快退等特技模式的实现也进行了探讨并提出具体方法。测试的结果表明，PFS适合运用于个人视频录像机。 |
| 英文摘要 | Personal Video Recorder(PVR) is a land of Set-top-box(STB) which integrate witli Hard Disk.lt can be used for receiving and viewing programmes as well as storing them.Besides the functions provided with Video Cassette Recorder,new features such as tdmeshifting have been introduced into PVRs which bring great facilities for customers.Witli the development in embedded technology and the rapid growth in STB market, it is the trend to add PVR characters to STBs. In PVRs files stored on Hard Disk and Hard Disk itself should be efficiendy managed, so it is necessary to develop a pithy and efficient file system to achieve this task.At present, little information about file system designed for PVR is available,therefore the. crucial task is to design and realize a private file system for PVR.In this paper,firsdy conventional dieories of file system are reviewed and typical file systems are introduced and analysed.Basing on above materials,the particularity of environment of PVRs is inclused which will gready influence die designment of file system.The probability of adapting existing embedded file system and file system employed by Personal Computer is discussed The principles of designing file system which applied to embedded system are proposed also.A new private file system which is named as PFS is developed.In this file system some special data structures and some key parameters are carefully chosen.The realization of Hard Disk driver and main interface function of PFS is described in emphasis.Based on PFS, realization of PVR functions such as timeshifting on given platform and solution on the problem of synchronization between audio and video while playing back from Hard Disk are described in detailAt last, some metiiods on realizing trick mode are proposed.Experimental result shows that PFS is suitable for PVRs. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 69 |
| 源URL | [http://159.226.59.140/handle/311008/1088]  |
| 专题 | 声学研究所_声学所博硕士学位论文_1981-2009博硕士学位论文 |
| 推荐引用方式 GB/T 7714 | 彭红卿. 嵌入环境下面向PVR应用的文件系统的设计与实现[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2003. |
入库方式： OAI收割
来源：声学研究所
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