信息技术.音视对象编码.第5部分:参考软件

[中文适用范围]： 参考软件是规范的，因为任何符合标准的软件实现，采用相同的符合比特流，使用相同的输出文件格式，都将输出相同的文件。 遵守 ISO/IEC 14496 的实现不应遵循参考软件所使用的算法或编程技术。 尽管解码软件被认为是规范性的，但它不能为 ISO/IEC 14496 第 1、2、3 和 6 部分中包含的文字技术描述添加任何内容。 ISO/IEC 14496 这部分中包含的软件分为三类： a) 基本流解码软件在第 3、4 和 5 条中进行分类。 该软件接受根据 ISO/IEC 14496 第 1、2、3 和 6 部分中的规范规范编码的基本流，并将这些流解码为相关的媒体类型与每个基本流。 虽然该软件出现在本规范的规范部分，但值得注意的是，该软件中使用的实现技术不被认为是规范的——几种不同的实现可能会产生相同的结果——但该软件被认为是规范的，因为它正确地实现 ISO/IEC 14496 第 1、2、3 和 6 部分中描述的解码过程。 b) 基本流编码软件在附件 A（资料性）中编目。 该软件从相关媒体类型创建基本流。 提供编码器是为了获得具有 ISO/IEC 14496 第 1、2 和 3 部分中描述的规范语法的基本流。 本规范未指定用于编码的技术，并且这些编码器的质量和复杂性没有被优化。 c) 实用软件编目于附录 B（资料性）。 标准开发人员发现该软件很有用，但可能不符合 ISO/IEC 14496 第 1、2、3 和 6 部分中给出的规范性规范。 ISO/IEC 14496 这部分中给出的文件位置表示为相对值到它在源树中的位置。 [外文原描述]： Reference software is normative in the sense that any conforming implementation of the software, taking the same conformant bitstreams, using the same output file format, will output the same file. Complying ISO/IEC 14496 implementations are not expected to follow the algorithms or the programming techniques used by the reference software. Although the decoding software is considered normative, it cannot add anything to the textual technical description included in parts 1, 2, 3 and 6 of ISO/IEC 14496. The software contained in this part of ISO/IEC 14496 is divided into three categories: a) Elementary stream decoding software is catalogued in clauses 3, 4 and 5. This software accepts elementary streams encoded according to the normative specification in parts 1, 2, 3 and 6 of ISO/IEC 14496 and decodes the streams into the media types associated with each elementary stream. While this software appears in the normative part of this specification, attention is drawn to the fact that the implementation techniques used in this software are not considered normative ? several different implementations could produce the same result ? but the software is considered normative in that it correctly implements the decoding processes described in parts 1, 2, 3 and 6 of ISO/IEC 14496. b) Elementary stream encoding software is catalogued in Annex A (informative). This software creates elementary streams from associated media types. The encoders are provided as a means to obtain elementary streams with the normative syntax described in parts 1, 2 and 3 of ISO/IEC 14496. The techniques used for encoding are not specified by this specification, and the quality and complexity of these encoders has not been optimized. c) Utility software is catalogued in Annex B (informative). This software was found useful by the developers of the standard, but may not conform to the normative specifications given in parts 1, 2, 3 and 6 of ISO/IEC 14496. File locations given in this part of ISO/IEC 14496 are expressed relative to its location in the source tree.