| 题名 | 宽带智能终端上IPTV技术研究与实现 |
| 作者 | 温慧尧 |
| 学位类别 | 博士 |
| 答辩日期 | 2005 |
| 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 | 受控组播协议 零拷贝 |
| 其他题名 | The Research and Implementation of IPTV technology on Broadband Video Terminals |
| 中文摘要 | 随着数字电视技术和网络技术的不断融合，支持IPTV的智能终端以其低廉价格和简单的操作正迅速走进家庭。在国家863项目"宽带信息网运营支撑环境及接入系统研制"中提出了宽带智能终端系统的研制。本文描述了一个满足863项目要求的，基于低成本的sigmaEM8551平台的智能终端系统研制方案，在此基础上设计并实现了IPTV客户端系统和嵌入式家庭内部点播系统。在智能终端的研制中，主要完成了如下工作：（1）IPTV客户端系统，通过零拷贝技术的采用和应用层RTP库的改进，达到了SMbit／s的TS流播放能力，高于本项目中6Mbi侧s的性能要求。（2）嵌入式家庭内部点播系统，设计了以推为数据传输方式，客户端进行流量控制的家庭内部点播协议，同一个终端既可以作为服务器也可以作为客户端点播其它终端上录制的节目。（3）快速数据接收的零拷贝技术，通过修改底层网卡驱动，引入零拷贝技术用于流媒体数据的接收，大幅度提高接收效率。（4）本地／异地硬盘播放VCR控制，本地硬盘播放通过文件读取位置的变化，异地硬盘播放通过在服务器端和客户端设计适当的通信协议，服务器端轮询请求的方式实现VCR操作。（5）系统信息灾难恢复，利用flosh的先擦后写特性，对每个存储单元头尾字节合理赋值并对该字节进行开机检测，实现系统信息的灾难恢复。 |
| 英文摘要 | In recent years, Digital TV and network technology are gradually merging together. IPTV supported by intelligent terminal which is featured with its low price and convenient operation ,is getting more and more popular among families. So that the Development of Broadband Video Terminal is proposed in National 863 project tilted with "High Performance Broadband Information Network". This thesis is concerned with the development scheme of a low-cost intelligent terminal system based on sigma EM8551, which satisfies 863 project's requirement. The design and implementation of IPTV client and embedded household video on demand system are mainly investigated. In this project, the following techniques are implemented: 1) IPTV client system. By using zero-copy technique and the improvement on RTP library, the playback capability of TS stream is up to 8M bit/s, which is higher than 6M bit/s requirement in this project. 2) Embed household video on demand system. A household video on demand protocol based on pull mode data transportation method and flow control by client is proposed. The terminal can serve either as a server or as a client to play the recorded programs by other terminals. 3) Zero-copy technique on data reception. By modifying the drivers of network card and implementing zero-copy technique on the reception of stream media, the reception efficiency is improved much higher. 4) VCR playback control on local/remote hard disk. Local hard disk playback is based on file storing location, while playback on remote disks is based on the designed communication protocols between server and client, VCR control is implemented by polling-request on servers. 5) System information disaster recovery. Based on the first-erase-last-write feature of flash, every storage unit's head and tail bytes are properly evaluated. These bytes are checked on starting up so as to recover system information disaster. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 88 |
| 内容类型 | 学位论文 |
| 源URL | [http://159.226.59.140/handle/311008/1002]  |
| 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 | 温慧尧. 宽带智能终端上IPTV技术研究与实现[D]. 中国科学院声学研究所. 中国科学院声学研究所. 2005. |
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