ISO/IEC 14496-4-2004 信息技术.音频-可视对象的编码.第4部分:一致性测试

标准号：ISO/IEC 14496-4-2004
中文标准名称：信息技术.音频-可视对象的编码.第4部分:一致性测试
英文标准名称：Information technology - Coding of audio-visual objects - Part 4: Conformance testing
标准类型：L81
发布日期：2004/12/1 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：L81
国际标准分类号：35.040
适用范围：This part of ISO/IEC 14496 specifies how tests can be designed to verify whether bitstreams and decodersmeet requirements specified in parts 1, 2 and 3 of ISO/IEC IEC 14496 and for part 6 of ISO/IEC 14496 itspecifies how tests can be designed for bitstream delivery over various delivery technologies in aninteroperable transparent manner to parts 1, 2 and 3. In this part of ISO/IEC 14496, encoders are notaddressed specifically. An encoder may be said to be an ISO/IEC 14496 encoder if it generates bitstreamscompliant with the syntactic and semantic bitstream requirements specified in parts 1, 2 and 3 ofISO/IEC 14496.Characteristics of coded bitstreams and decoders are defined for parts 1, 2 and 3 of ISO/IEC 14496. Thecharacteristics of a bitstream define the subset of the standard that is exploited in the bitstream. Examples arethe applied values or range of the picture size and bitrate parameters. Decoder characteristics define theproperties and capabilities of the applied decoding process. An example of a property is the applied arithmeticaccuracy. The capabilities of a decoder specify which coded bitstreams the decoder can decode andreconstruct, by defining the subset of the standard that may be exploited in decodable bitstreams. A bitstreamcan be decoded by a decoder if the characteristics of the coded bitstream are within the subset of thestandard specified by the decoder capabilities.Procedures are described for testing conformance of bitstreams and decoders to the requirements defined inparts 1, 2 and 3 of ISO/IEC 14496. Given the set of characteristics claimed, the requirements that must bemet are fully determined by parts 1, 2 and 3 of ISO/IEC 14496. This part of ISO/IEC 14496 summarises therequirements, cross references them to characteristics, and defines how conformance with them can betested. Guidelines are given on constructing tests to verify bitstream and decoder conformance. Thisdocument gives guidelines on how to construct bitstream test suites to check or verify decoder conformance.In addition, some test bitstreams implemented according to those guidelines are provided as an electronicannex to this document. The procedures and signaling messages for session and channel establishment aredefined in part 6 of ISO/IEC 14496.Conformance with the signaling messages and procedures in this part of ISO/IEC 14496 are defined inaccordance to the specifications in part 6 of ISO/IEC 14496. This specification allows the manufacturer toidentify the conformance of the signaling message in a static review and provides abstract test cases to testthe conformance to the procedures in a dynamic review of an implementation as defined in ISO/IEC 9646Conformance Testing standard.