用Delphi实现一个多媒体播放器

使用Ｄｅｌｐｈｉ提供的ＴｍｅｄｉａＰｌａｙｅｒ构件加上简单的程序设计,就可以实现一个功能比较简单的多媒体播放器。Ｗｉｎｄｏｗｓ３Ｘ／Ｗｉｎｄｏｗｓ９Ｘ支持多媒体功能,提供了多媒体控制接口（ＭｕｌｔｉｍｅｄｉａＣｏｎｔｒｏｌＩｎｔｅｒｆａｃｅ,ＭＣＩ）。Ｄｅｌｐｈｉ的ＴｍｅｄｉａＰｌａｙｅｒ构件对ＭＣＩ进行了全面的封装,使得多媒体编程变得简单,它提供ＭＣＩ的驱动命令,可以控制多种多样的媒体设备和文件。这些与设备无关的高级命令可以控制Ｗｉｎ－ｄｏｗｓ提供的ＭＣＩ设备,可驱动ＣＤ－ＲＯＭ、声卡、ＭＩＤ…     

实时通信系统的网络存取协议

本文提出一种基于ＣＳＭＡ／ＣＤ方法新型网络存取协议,为了评价本协议的性能做了大量的仿真实验,并将传统的ＣＳＭＡ／ＣＤ,ＶＴＣＳＭＡ／ＣＤ－Ｌ和ＰＢＣＳＭＡ／ＣＤ三种协议的性能进行了比较。结果表明,ＰＢＣＳＭＡ／ＣＤ协议性能良好。     

DCOM／ActiveX和CORBA的比较

本文从企业计算的角度,从集成性、可用性和可扩展性三个方面较为详细的比较了ＤＣＯＭ／ＡｃｔｉｖｅＸ和ＣＯＲＢＡ这两种当今最主要的分布式构件模型。     

汽车CAD／CAE／CAM集成制造中的多媒体系统

在简述多媒体 信息处理技术的基本放关键特点的基础上，论述了汽车ＣＡＤ／ＣＡＥ／ＣＡＭ集成制造多媒体环境及应用多媒体信息处理技术的必要性，探讨了汽车ＣＡＤ／ＣＡＥ／ＣＡＭ集成制造多媒体信息处理技术构成及发展趋势。     

汽车CAD／CAE／CAM集成制造多媒体信息处理技术

本文探讨了汽车ＣＡＤ／ＣＡＥ／ＤＣＡＭ集成制造的多媒体环境，论述了汽车ＣＡＤ／ＣＡＥ／ＣＡＭ集成制造多媒体信息处理技术构成，技术线路和实施方案以及发展趋势。     

多媒体数据库管理系统DM2

本文介绍一个界面友好，结构优良，功能强，性能高的分布式多媒体数据库管理系统列当代先进的软件技术，实现了对复杂对象的常规信息和多媒体信息的分布式一体化处理，并可与流行的ＯＲＡＣＬＥ等ＤＢＭＳ兼容，从而为用户建立多媒体ＭＩＳ提供一个良好的开发环境。     

大中型电机冷冲模CAD／CAM系统

本文就开发“大中型电机冷冲模ＣＡＤ／ＣＡＭ系统”中应用ＣＡＤ／ＣＡＭ技术进行简要的论述分析。系统以ＡｕｔｏＣＡＤ为支撑平台，采用分布式ＣＡＤ系统结构，应用特征技术进行模具设计，使用内嵌式数据库和程序参数化技术提高了系统设计速度，同时也提高了系统的稳定性和可靠性。     

大中型电机冷冲模CAD／CAM系统

本文就开发“大中型电机冷冲模ＣＡＤ／ＣＡＭ系统”中应用ＣＡＤ／ＣＡＭ技术进行简要的论述分析。系统以ＡｕｔｏＣＡＤ为支撑平台，采用分布式ＣＡＤ系统结构，应用特征技术进行模具设计，使用内嵌式数据库和程序参数化技术提高了系统设计速度，同时也提高了系统的稳定性和可靠性。     

在MCAI课件中利用DLL扩充数据库管理功能

本文提出了利用ＤＬＬ作为多媒体著作工具与数据库的接口,实现在ＭＣＡＩ软件中增加数据库管理功能的方法,从而有效地提高ＭＣＡＩ软件的信息组织和处理能力。     

软件构件化技术及其在桥梁CAD中的应用

软件构件化是当今软件工业发展的主流,介绍了软件的构件化开发技术和构件对象模型ＣＯＭ,并针对我国当前桥梁ＣＡＤ软件发展的现状,提出了采用构件化技术开发ＣＡＤ软件系统的必要性,最后结合一个简单实例说明了其可行性。     

分布式多媒体辅助开发工具包DMST的设计与实现

本文介绍分布式多媒体辅助开发工具包DMST的设计与实现。基于对象化的层次模型,工具包提供了功能构件和分布式多媒体对象两个层次的开发接口,具有良好的软件重用性,灵活性,平台适应性和扩展性。     

Designing a Multimedia Information System Using Internet Techology

This paper presents major technical requirements for designing and developing future distributed multimedia information system using Internet technology. The key requirements of this system are to allow users to search, access, and communicate multimedia documents consisting of text, audio, video and image. We emphasize the role of object-oriented technology for information management and real-time communication protocols to guarantee QoS. it presents a reference architecture for Web-based real-time distributed multimedia system which provides several functionalities including real-time distributed multimedia system which provides several functionalities including real-time streaming, multimedia indexing and searching, and distributed object management.     

Efficient data layout, scheduling and playout control in MARS

Large-scale on-demand multimedia servers that can provide independent and interactive access to a vast amount of multimedia information to a large number of concurrent clients will be required for a widespread deployment of exciting multimedia applications. Our project, called Massively-parallel And Real-time Storage (MARS) is aimed at prototype development of such a large-scale server. This paper primarily focuses on the distributed data layout and scheduling techniques developed as a part of this project. These techniques support a high degree of parallelism and concurrency, and efficiently implement various playout control operations, such as fast forward, rewind, pause, resume, frame advance and random access.     

An efficient synchronization scheme of multimedia streams in wireless and mobile systems

Recent advances in mobile computing and distributed multimedia systems allow mobile hosts (clients) to access wireless multimedia systems anywhere and at anytime, but not without creating a new set of issues and trade-offs. To the best of our knowledge, there has been very little research in dealing with the synchronization problem in wireless and mobile multimedia systems. In this paper, we propose an efficient distributed synchronization algorithm using quasi-sink for wireless and mobile multimedia systems to ensure and facilitate mobile client access to multimedia objects. We discuss the algorithm and provide its proof of correctness. We also present a set of simulation experiments to evaluate the performance of our scheme using message complexity and buffer usage at each frame arrival time. Our results indicate that our scheme exhibits a significant low message complexity and no underflow and overflow within the bounded delivery time.     

Techniques for Scheduling I/O in a High Performance Multimedia-on-Demand Server

One of the key components of a multiuser multimedia-on-demand system is the data server. Digitalization of traditionally analog data such as video and audio, and the feasibility of obtaining network bandwidths above the gigabit-per-second range, are two important advances that have made possible the realization, in the near future, of interactive distributed multimedia systems. Secondary-to-main memory I/O technology has not kept pace with advances in networking, main memory, and CPU processing power. Consequently, the performance of the server has a direct bearing on the overall performance of such a system. In this paper, we present a highperformance solution to the I/O retrieval problem in a distributed multimedia system. We develop a model for the architecture of a server for such a system. Parallelism of data retrieval is achieved by striping the data across multiple disks. We present the algorithms for server operation when servicing a constant number of streams, as well as the admission control policy for accepting requests for new streams. The performance of any server ultimately depends on the data access patterns. Two modifications of the basic retrieval algorithm are presented to exploit data access patterns in order to improve system throughput and response time. Finally, we present preliminary performance results of these algorithms on the IBM SP1 and Intel Paragon parallel computers.     

Canonical processes for creating personalized semantically rich multimedia presentations

Authoring of multimedia content can be considered as composing media assets such as images, videos, text, and audio in time, space, and interaction into a coherent multimedia presentation. Personalization of such content means that it reflects the users’ or user groups’ profile information and context information. Enriching the multimedia content with semantically rich metadata allows for a better search and retrieval of the content. To actually create personalized semantically-rich multimedia content, a manual authoring of the many different documents for all the different users’ and user groups’ needs is not feasible. Rather a (semi-)automatic authoring of the content seems reasonable. We have analyzed in detail today’s approaches and systems for authoring, personalizing, and semantically enriching multimedia presentations. Based on this analysis, we derived a general creation chain for the (semi-)automatic generation of such content. In this paper, we introduce this creation chain. We present our software engineering support for the chain, the component framework SemanticMM4U. The canonical processes supported by the creation chain and SemanticMM4U framework are described in detail. We also provide an explicit mapping of SemanticMM4U framework components to the processes and argue for the benefits of defining canonical processes for creating personalized semantically rich multimedia presentations.     

Developing and Maintaining an Object-Oriented Distributed Multimedia Information System

As object-oriented analysis and design techniques mature, the promises of object-orientation become more realizable. The advent of multimedia hardware and software technology give rise to a need for generalized multimedia data access methods. This paper describes the object-oriented development and subsequent maintenance of ENFORMS, an object-oriented distributed multimedia information system. We discuss the advantages and disadvantages of using object-oriented analysis and design techniques to develop a general client–server architecture for browsing, retrieving, and analyzing distributed multimedia data. We also describe lessons learned from this project, including the impact of a rigorous application of object-oriented analysis and design techniques.     

A model for secure multimedia document database system in a distributed environment

The Internet provides a universal platform for large-scale distribution of information and supports inter-organizational services, system integration, and collaboration. Use of multimedia documents for dissemination and sharing of massive amounts of information is becoming a common practice for Internet-based applications and enterprises. With the rapid proliferation of multimedia data management technologies over the Internet, there is growing concern about security and privacy of information. Composing multimedia documents in a distributed heterogeneous environment involves integrating media objects from multiple security domains that may employ different access control policies for media objects. In this paper, we present a security model for distributed document management system that allows creation, storage, indexing, and presentation of secure multimedia documents. The model is based on a time augmented Petri-net and provides a flexible, multilevel access control mechanism that allows clearance-based access to different levels of information in a document. In addition, the model provides detailed multimedia synchronization requirements including deterministic and non-deterministic temporal relations and incomplete timing information among media objects.     

基于DCOM的领域数据访问中间件的研究与实现

中间件的发展为数据访问提供了新的途径。DCOM作为一种常用的分布式对象标准,其对数据访问的方法非常重要。结合领域数据特点,提出了一个基于DCOM的领域数据访问的中间件模型,并给出了具体的实现。     

Synthesis of decentralized and concurrent adaptors for correctly assembling distributed component-based systems

Building a distributed system from third-party components introduces a set of problems, mainly related to compatibility and communication. Our existing approach to solve such problems is to build a centralized adaptor which restricts the system’s behavior to exhibit only deadlock-free and desired interactions. However, in a distributed environment such an approach is not always suitable. In this paper, we show how to automatically generate a distributed adaptor for a set of black-box components. First, by taking into account a specification of the interaction behavior of each component, we synthesize a behavioral model for a centralized glue adaptor. Second, from the synthesized adaptor model and a specification of the desired behavior that must be enforced, we generate one local adaptor for each component. The local adaptors cooperatively behave as the centralized one restricted with respect to the specified desired interactions.