面向数字家庭的媒体分发技术研究
文献类型：学位论文
| 作者 | 朱小勇 |
| 学位类别 | 博士 |
| 答辩日期 | 2009-05-25 |
| 授予单位 | 中国科学院声学研究所 |
| 授予地点 | 声学研究所 |
| 关键词 | 数字家庭 媒体分发 家庭媒体中心 VCR操作 流媒体 文件传输 |
| 其他题名 | Research on Technologies of Media Distribution Oriented to Digital Family |
| 学位专业 | 信号与信息处理 |
| 中文摘要 | 随着网络融合的推进，越来越多的数字媒体内容通过网络进入家庭。在数字家庭网络中，采用高效的媒体分发策略和技术，实现家庭内部媒体内容的分发和共享，既是现代服务业中高质量开展媒体服务的迫切需求，也是数字家庭为融合型新媒体服务提供技术及设备支撑的重要所在。 与通常媒体分发技术不同的是，家庭中的媒体分发主要是设备间点对点的媒体内容传输。家庭网络技术和各种互联互通协议的成熟为媒体内容传输提供了有效支撑，但传统的点对点的媒体分发技术难以实现为处理能力不同的异构终端提供高质量的媒体内容分发。面向家庭媒体内容高清化和嵌入式异构媒体终端，本文对以下几个关键技术展开研究：1）如何将大型多媒体文件快速传输到嵌入式媒体终端；2）如何保证家庭内流媒体，特别是高清晰度流媒体业务的服务质量；3）如何为各种类型和格式的多媒体文件提供有效的VCR操作；4）家庭中的媒体内容多以压缩的形式存在，限制了低解码能力的显示设备的访问，如何为这些设备提供有效的媒体内容共享。论文的主要贡献如下： 1、提出了一种面向嵌入式终端的多媒体文件快速传输技术FTPU。 针对家庭中采用普通的文件传输技术难以快速将大型多媒体文件分发到嵌入式终端上的缺陷，FTPU采用UDP协议进行文件数据传输，发送端根据接收端处理能力对数据传输速率进行适配，能够充分利用接收端的处理能力，使传输效率最大化，以快速地将多媒体文件传输到嵌入式终端。与FTP协议相比，传输大型多媒体文件时FTPU能够将传输时间缩短25%左右。 2、提出了一种基于贪婪算法的流媒体码率平滑技术G-RCBS。 G-RCBS能够在保证客户端流畅播放的前提下，根据客户端的数据处理能力和缓冲区大小进行数据传输速率规划。与RCBS相比，在同等资源条件下能够获得更小的启动播放延迟，提高了家庭中流媒体业务的服务质量。 3、提出了一种多层协作的嵌入式流媒体数据处理技术。 通过在应用层监测流媒体数据出现突发的时刻，在满足流媒体数据实时性要求的前提下，延迟应用层的数据处理，减轻数据突发时嵌入式系统的压力。与普通的流媒体数据处理技术相比，该方案能够有效降低流媒体分组丢失的概率。 4、提出了一种针对无索引信息的TS文件的时间快速定位算法以及快进、快退过程中的数据挑选机制。 TS格式面向广播系统设计，其固有的封装格式难以支撑灵活的人机交互，如VCR功能。针对该问题，提出了相应的改进措施：时间快速定位算法能够比普通的估算法更精确，而且与二分搜索算法相比具有更低的时间消耗；数据挑选机制能够有效保证快进、快退过程中画面的均匀性。通过上述两种技术充分保证了基于TS文件的VCR功能的实现效果。 5、提出了一种交互式非压缩媒体内容的分发方法，使得家庭中一些不具备解码能力的显示设备能够访问压缩后多媒体内容。 在分析家庭网络环境和多媒体设备特点的基础上，设计了非压缩媒体内容分发系统架构和分发方法。首先，家庭媒体中心整合媒体内容信息，并将其发送到对应的多媒体设备上。然后设备根据内容列表浏览和选择所需媒体内容。最终，家庭媒体中心对选定的内容进行解压缩后传输到多媒体设备。由于媒体传输的高带宽需求，本方案中选用家庭中广泛铺设的同轴电缆作为内容信息和非压缩媒体数据的传输信道，而多媒体设备反馈的交互信息则通过无线信道传输。 |
| 英文摘要 | Along with the progress of converged network, more and more digital media contents become available in home through network. In the digital home network, to carry out media content sharing service with high-quality content distribution strategy and technology is not only the urgent demand of modern service industry but also the technical and device support of the new converged media service in digital family. Unlike the usual media distribution technology, media distribution in home mainly refers to point-to-point transmission of media content between devices. Various home network technology and interconnection protocols provide effective support for media content transmission. However, it is difficult to provide high-quality media content distribution for heterogeneous terminals with the common technology.Oriented to high-definition media content and embedded heterogeneous media devices in home, this thesis focuses on the following key technologies: 1) how to deliver large media files to embedded media devices in a short time; 2) how to guarantee QoS of stream media in home network, especially the stream of high-definition content; 3) how to provide effective VCR function over different multimedia file formats; 4) some display devices without decoding capacity can not access multimedia contents which exist in compressed form, how to provide media content sharing for these devices. Contributions and innovative work of this dissertation are described as follows: 1．A fast media file transferring approach (FTPU) oriented at delivering large multimedia files to embedded devices in a short period of time is proposed. In FTPU UDP protocol is adopted to transfer file data and the sender adapts the data rate to the ability of the receiver to fully utilize the limited handling capacity of the embedded device. Compared with FTP, FTPU can reduce the whole transferring time by 25% when large media file is delivered. 2. A stream media rate smoothing approach based on greedy algorithm (G-RCBS) is presented. G-RCBS can guarantee media playout without any interruption and the media data transfer rate not exceeding the capacity of client. Compared with RCBS, G-RCBS can achieve smaller initial playout delay and guarantee the QoS of stream media in home network. 3. A multilayer cooperative embedded stream media data processing approach is brought forward. Throughout detecting the emergence of traffic burst during the transferring at application layer, delay data processing at application layer without missing the deadline of stream media data to alleviate the pressure over the embedded system. Compared with current stream data processing technique, the proposed approach can reduce the probability of data loss efficiently. 4. A fast time localization method and an efficient data selecting scheme used in fast/back forward based on TS (transport stream) are put forward to solve the problem about VCR function over TS format. TS format is unsuitable for user interaction, especially when used for VCR function, for it is originally designed for broadcast communication and has no straightforward information for interactive functionality. Fast time localization method can attain more accurate result than common estimation method and has lower time cost than binary search. Data selecting scheme can guarantee video display uniformity during fast/back forward. The two methods mentioned above can guarantee friendly VCR function based on TS. 5. An interactive uncompressed media content sharing approach is proposed to solve the problem that some multimedia devices with poor handling capacity cannot access compressed multimedia contents in home networks. Based on the study of characteristic of home network and multimedia devices, the system architecture and media distribution approach are put forward. In the designed system home media server is the access center and control center. Home media server aggregates multimedia content information in home and deliver it to multimedia devices. The devices browse and select required content according to content list. Finally, home media center decompresses the targeted multimedia content and delivers the uncompressed content to devices. Due to abundant bandwidth required by media data transmission, the coax cable already widely deployed in home is used for home media center to transferring the content list information and uncompressed media data. The multimedia devices transmit interactive message via wireless channel. |
| 语种 | 中文 |
| 公开日期 | 2011-05-07 |
| 页码 | 129 |
| 源URL | [http://159.226.59.140/handle/311008/468]  |
| 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 | 朱小勇. 面向数字家庭的媒体分发技术研究[D]. 声学研究所. 中国科学院声学研究所. 2009. |
入库方式： OAI收割
来源：声学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。