ISO/IEC 13818-1:2007 信息技术 运动图像及其伴音信息的通用编码 第1部分：系统

标准编号：ISO/IEC 13818-1:2007

中文名称：信息技术 运动图像及其伴音信息的通用编码 第1部分：系统

英文名称：Information technology — Generic coding of moving pictures and associated audio information: Systems — Part 1:

发布日期：2007-10

标准范围

ISO/IEC 13818-1:20 07规定了编码的系统层。它的开发主要是为了支持ISO/IEC 13818-2和ISO/IEC 13818-3中定义的视频和音频编码方法的组合。系统层支持六大基本功能:解码时多个压缩流的同步；将多个压缩流交织成单个流；用于解码启动的缓冲的初始化；连续缓冲区管理；时间识别；系统流中各种分量的复用和信令。ISO/IEC 13818-1:20 07复用比特流是传输流或程序流。这两个流都是由PES分组和包含其它必要信息的分组构成的。两种流类型都支持来自具有公共时基的一个节目的视频和音频压缩流的多路复用。传输流另外支持来自具有独立时基的多个节目的视频和音频压缩流的复用。对于几乎无错误的环境，节目流通常更合适，支持节目信息的软件处理。传输流更适合在可能出错的环境中使用。ISO/IEC 13818-1:20 07复用比特流，无论是传输流还是程序流，都被构造成两层:最外层是系统层，最内层是压缩层。系统层提供在系统中使用一个或多个压缩数据流所必需的功能。ISO/IEC 13818-1:20 07的视频和音频部分定义了音频和视频数据的压缩编码层。ISO/IEC 13818-1:20 07未定义其他类型数据的编码，但只要其他类型数据遵守2.7中定义的约束，系统层就支持这些编码。

ISO/IEC 13818-1:2007 specifies the system layer of the coding. It was developed principally to support the combination of the video and audio coding methods defined in ISO/IEC 13818-2 and ISO/IEC 13818-3. The system layer supports six basic functions:

1. the synchronization of multiple compressed streams on decoding;
2. the interleaving of multiple compressed streams into a single stream;
3. the initialization of buffering for decoding start up;
4. continuous buffer management;
5. time identification;
6. multiplexing and signalling of various components in a system stream.

An ISO/IEC 13818-1:2007 multiplexed bit stream is either a Transport Stream or a Program Stream. Both streams are constructed from PES packets and packets containing other necessary information. Both stream types support multiplexing of video and audio compressed streams from one program with a common time base.The Transport Stream additionally supports the multiplexing of video and audio compressed streams from multiple programs with independent time bases. For almost error-free environments the Program Stream is generally more appropriate, supporting software processing of program information. The Transport Stream is more suitable for use in environments where errors are likely.An ISO/IEC 13818-1:2007 multiplexed bit stream, whether a Transport Stream or a Program Stream, is constructed in two layers: the outermost layer is the system layer, and the innermost is the compression layer. The system layer provides the functions necessary for using one or more compressed data streams in a system. The video and audio parts of ISO/IEC 13818-1:2007 define the compression coding layer for audio and video data. Coding of other types of data is not defined by ISO/IEC 13818-1:2007, but is supported by the system layer provided that the other types of data adhere to the constraints defined in 2.7.

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