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现行 ISO/IEC 16500-6:1999
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Information technology — Generic digital audio-visual systems — Part 6: Information representation 信息技术——通用数字视听系统第6部分:信息表示
发布日期: 1999-12-16
ISO/IEC 16500的这一部分采用了一种实用的方法来规范信息表示。只是 在制作DAVIC应用程序集(即广播、电影)时无法省略的信息类型 规定了按需购物、家庭购物等)。ISO/IEC 16500本部分采用的方法从定义 各种单媒体信息类型。它们包括字符、文本、字体、服务信息、音频、视频和视频 图样根据DAVIC原则,为每种信息类型选择一种工具进行编码。 多媒体组件包括一个或多个单媒体组件。ISO/IEC 16500的这一部分定义了 多媒体信息的编码和交换。这包括虚拟机和集合的定义 支持程序代码的互操作交换的API。最后,ISO/IEC 16500的这一部分定义了一个参考 内容解码的解码器模型,它提供了对内容的约束。政府解决的主要问题 该模型通过为内容指定内存和行为约束来确保应用程序的互操作性 由假设的STU解码,而不指定STU的内部设计。根据 参考解码器模型将是“符合ISO/IEC 16500标准的应用”,并将在 符合ISO/IEC 16500的STU。 对于每个单媒体和多媒体组件,都指定了编码格式,以及适用的约束条件 组件的编码。 区分了三种类型的单媒体组件。单媒体组件 包含在其他单媒体组件中的,例如文本中的字符,属于隐含类型。非暗示 播放时不需要与时基同步的单媒体组件属于独立类型。 最后,非隐含的单媒体组件,其呈现可能需要与时基同步 属于stream类型。ISO/IEC 16500的这一部分定义了每个DAVIC定义的单媒体组件可以使用的类型 take,并指定流类型的单媒体组件的编码表示在PES中打包 数据包(关于PES数据包的定义,请参考ISO/IEC 13818-1)。PES数据包允许(1)包含时间戳 支持基于公共时基的多个单媒体组件的相互同步(2)到 在内容解码的通用参考模型中定义定时和缓冲区行为。虽然有各种 ISO/IEC 16500的这一部分定义了如何向STU交付单媒体和多媒体组件 组件在MPEG-2传输流中携带。 DAVIC指定了许多不同的配置文件。在特定的配置文件中,可能支持 单媒体组件。符合DAVIC特定配置文件的每个STU应能够解码和 展示该配置文件中允许的每个单媒体和多媒体组件。 ISO/IEC 16500的本部分还规定了内容和元数据的包装方法。 以什么方式 内容打包交付独立于内容数据交付给SPS的方式(可能是 通过物理介质或传输系统交付给服务提供商)。所有编程内容都是 在DAVIC系统中表示为多媒体组件。多媒体组件包括一个或多个 单媒体组件与单媒体组件之间的逻辑关系耦合。多媒体 内容提供商将创建组件,以输入服务器。
This part of ISO/IEC 16500 takes a practical approach to the specification of Information Representation. Just the information types that cannot be dispensed with in producing the set of DAVIC applications (viz. broadcast, movies on demand, home shopping, etc.) are specified. The approach taken in this part of ISO/IEC 16500 starts by defining the various monomedia information types. They include character, text, fonts, service information, audio, video, and graphics. Consistent with DAVIC principles, one tool is selected for the encoding of each information type. Multimedia components comprise one or more monomedia components. This part of ISO/IEC 16500 defines the way in which multimedia information is coded and exchanged. This includes the definition of a virtual machine and a set of APIs to support interoperable exchange of program code. Finally, this part of ISO/IEC 16500 defines a Reference Decoder Model for contents decoding which provides constraints on content. The major problem addressed by the model is to ensure interoperability of applications by specifying memory and behaviour constraints for contents decoding by a hypothetical STU, without specifying the internal design of an STU. An application built according to the reference decoder model will be an "ISO/IEC 16500 conforming application" and will successfully execute on a STU that is compliant to ISO/IEC 16500. For each monomedia and multimedia component the coding format is specified, as well as applicable constraints for coding of the components. Three types of monomedia components are distinguished. Monomedia components which are included within other monomedia components, such as characters within text, are of type implied. Non-implied monomedia components that do not require synchronization with a time base at play back, are of type stand-alone. Finally, non-implied monomedia components of which the presentation may require synchronization with a time base are of type stream. This part of ISO/IEC 16500 defines which type each DAVIC defined monomedia component may take, and specifies that the coded representation of monomedia components of type stream are packetized in PES packets (for definition of PES packets refer to ISO/IEC 13818-1). PES packets permit (1) to include time stamps to support mutual synchronisation of multiple monomedia components in reference to a common time base and (2) to define timing and buffer behaviour in a common reference model for contents decoding. While there are various ways to deliver the monomedia and multimedia components to the STU, This part of ISO/IEC 16500 defines how the components are carried in an MPEG-2 Transport Stream. DAVIC specifies a number of different profiles. In a specific profile there may be support of a subset of the monomedia components. Each STU that complies to a specific profile of DAVIC shall be capable of decoding and presenting each monomedia and multimedia component permitted within that profile. This part of ISO/IEC 16500 also specifies methods for packaging of contents and metadata. The way in which content is packaged for delivery is independent of the way in which content data is delivered to the SPS (it may be delivered to a Service Provider either on physical media or over a transmission system). All programming content is represented in the DAVIC system as multimedia components. Multimedia components comprise one or more monomedia components coupled with the logical relationships between the monomedia components. The multimedia components will be created by content providers for input to the servers.
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发布单位或类别: 国际组织-国际标准化组织
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归口单位: ISO/IEC JTC 1/SC 29
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