1、I NTERNAT IO NAL STANDARD ISO/IEC 11172-4 Fi rst edit ion 1995-03-1 5 (Reaffirmed 2004) Information technology - Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s - Part 4: Compliance testing Technologies de /information - Codage de !image animee et d
2、u son associe pour les supports de stockage numerIque jusqua environ Partie 4: Essais de conformite 7,5 Mbit/s - National Standard of Canada CA N/CSA-ISO/IEC-1 1 172-4-96 International Standard ISO/IEC 111724:1995 has been adopted, without modification, as CAN/CSA-ISO/IEGl1172-496, which has been ap
3、proved as a National Standard of Canada by the Standards Council of Canada. December 1996 ISSN 031 7-5669 Reference number ISO/IEC 17 172-4:1995(E) ICS 35.040 Ref. No. ISO/IEC 11172-4:1995/Cor.1:2007(E) ISO/IEC 2007 All rights reserved INTERNATIONAL STANDARD ISO/IEC 11172-4:1995 TECHNICAL CORRIGENDU
4、M 1 Published 2007-02-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATIONINTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALEInformation technology Coding of moving pictures and associated audio for digital storage media at up
5、 to about 1,5 Mbit/s Part 4: Compliance testing TECHNICAL CORRIGENDUM 1 Technologies de linformation Codage de limage anime et du son associ pour les supports de stockage numrique jusqu environ 1,5 Mbit/s Partie 4: Essais de conformit RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to ISO/IEC 11172
6、-4:1995 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. International Organization for Standardization (ISO), 2007. All rights reserved. International Electrotechnical Commission (IE
7、C), 2007. All rights reserved. NOT FOR RESALE.Technical Corrigendum 1:2007 toNational Standard of CanadaCAN/CSA-ISO/IEC 11172-4-96Technical Corrigendum 1:2007 to International Standard ISO/IEC 11172-4:1995 has been adopted withoutmodification (IDT) as Technical Corrigendum 1:2007 to CAN/CSA-ISO/IEC
8、11172-4-96. This TechnicalCorrigendum was reviewed by the CSA Technical Committee on Information Technology (TCIT) under thejurisdiction of the Strategic Steering Committee on Information Technology and deemed acceptable for use inCanada.August 2007ISO/IEC 11172-4:1995/Cor.1:2007(E) 2 ISO/IEC 2007 A
9、ll rights reservedIn subclause 1.2, “Normative references”, remove the following: IEEE Draft Standard P1180/D2 1990, Specification for the implementation of 8x8 inverse discrete cosine transform. In subclause 1.2, “Normative references”, add the following: ISO/IEC 23002-1, Information technology MPE
10、G video technologies Part 1: Accuracy requirements for implementation of integer-output 8x8 inverse discrete cosine transform In subclause 2.4.2, “Video decoders”, replace the following: For a video decoder to be compliant to ISO/IEC 11172-2 a statement of whether or not computation is carried out w
11、ith the full accuracy specified in ISO/IEC 11172-2 is required. If the full arithmetic precision is not implemented, the accuracy shall be specified. In the case of the inverse DCT, compliance testing requires performing the tests described in IEEE standard P1180/D2, as indicated in Annex A of ISO/I
12、EC 11172-2, and a statement of the numerical results for peak error and mean square error. with: For a video decoder to be compliant to ISO/IEC 11172-2 a statement of whether or not computation is carried out with the full accuracy specified in ISO/IEC 11172-2 is required. If the full arithmetic pre
13、cision is not implemented, the accuracy shall be specified. In the case of the inverse DCT, compliance testing requires performing the tests specified in Annex A of ISO/IEC 11172-2 (which are the tests specified in the main body of ISO/IEC 23002-1), and a statement of the numerical results for maxim
14、um peak absolute error (PAE) and overall mean square error (OMSE), which shall be measured as specified in ISO/IEC 23002-1. In subclause 2.6.2, “Video decoder tests”, replace the following: b) Encode the video material using a range of parameters to cover the decoder characteristics to be tested. Pa
15、rameters should be tested at normal values as well as close to the maximum and minimum values permitted by the decoder characteristics. Horizontal and vertical picture sizes should be tested that are not multiples of 16. The bitstreams should contain a mix of I-, B- and P-pictures, as appropriate fo
16、r the characteristics of the decoder under test. To test IDCT mismatch, bitstreams should contain series of 132 successive P-pictures. c) Decode the video bitstream using a reference decoder. The reference decoder could for example apply the reference inverse DCT specified in the IEEE draft standard
17、 P1180/D2 (see Annex A of ISO/IEC 11172-2). The reference decoder may be an accurate software implementation. with: b) Encode the video material using a range of parameters to cover the decoder characteristics to be tested. Parameters should be tested at normal values as well as close to the maximum
18、 and minimum values permitted by the decoder characteristics. Horizontal and vertical picture sizes should be tested that are not multiples of 16. The bitstreams should contain a mix of I-, B- and P-pictures, as appropriate for the characteristics of the decoder under test. To test IDCT mismatch, bi
19、tstreams should contain a long series of successive P-pictures in which appear a variety of cases for which a macroblock position has 131 successive uses of non-intra macroblock coding with non-zero motion vectors or non-zero transform coefficients (or both). c) Decode the video bitstream using a re
20、ference decoder that applies the ideal integer-valued 8x8 inverse DCT specified in ISO/IEC 23002-1. Technical Corrigendum 1:2007 toCAN/CSA-ISO/IEC 11172-4-96 ISO/IEC 11172-4:1995/Cor.1:2007(E) ISO/IEC 2007 All rights reserved 3In subclause 2.6.2, “Video decoder tests”, replace the following: On arit
21、hmetic precision, compliance of an ISO/IEC 11172-2 video decoder requires a statement of whether or not computation is carried out with the full accuracy specified in ISO/IEC 11172-2. If the computation is not fully accurate, the accuracy shall be specified. In the case of the IDCT, this includes pe
22、rforming the tests described in the IEEE standard P1180/D2 as indicated in annex A of ISO/IEC 11172-2, and stating the numerical results for peak error and mean square error. To be called a limited accuracy ISO/IEC 11172-2 video decoder, the numerical results for peak error and mean square error for
23、 the decoder shall not be greater than exactly twice the values specified in the IEEE standard P1180/D2. To be ISO/IEC 11172-2 compliant, a video decoder shall meet the accuracy requirements for limited accuracy ISO/IEC 11172-2 video decoders. To be called an ISO/IEC 11172-2 video decoder, the peak
24、error and mean square error of the decoder shall meet the full accuracy requirements from IEEE standard P1180/D2. with: On arithmetic precision, compliance of an ISO/IEC 11172-2 video decoder requires a statement of whether or not computation is carried out with the full accuracy specified in ISO/IE
25、C 11172-2. If the computation is not fully accurate, the accuracy shall be specified. In the case of the IDCT, this includes performing the tests specified in Annex A of ISO/IEC 11172-2 (which are the tests specified in the main body of ISO/IEC 23002-1), and stating the numerical results for maximum
26、 peak absolute error (PAE) and overall mean square error (OMSE), which shall be measured as specified in ISO/IEC 23002-1. To be called a limited accuracy ISO/IEC 11172-2 video decoder, the numerical results for maximum PAE and OMSE for the decoder shall not be greater than exactly twice the values s
27、pecified in ISO/IEC 23002-1. To be ISO/IEC 11172-2 limited-accuracy compliant, a video decoder shall meet the accuracy requirements for limited accuracy ISO/IEC 11172-2 video decoders. To be called an ISO/IEC 11172-2 video decoder, the decoder shall meet the full accuracy requirements of ISO/IEC 111
28、72-2 (including Annex A of ISO/IEC 11172-2 in particular, which requires conformance to the accuracy requirements specified in the main body of ISO/IEC 23002-1). Technical Corrigendum 1:2007 toCAN/CSA-ISO/IEC 11172-4-96 ISO/IEC 11172-4: 1995 (E) Contents Page . Foreword . 1 I 1 Introduction . . . .
29、. . . . . . + I +, . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .i v Section 1: General . 1 I. 1 Scope . _._ . . . 1 1 .2 Normative references . . . . , ,. . . . , . . . . , . . . , , . . . . . . . ,.
30、. . . . . . . . . . . . . . . . . . . . . . . . . . 1 Section 2: Technical elements . . . . . . . . . . . . . . . . . . 2 2.1 Definitions. . . . . . . . . . _, . . . . . . _ 2 2.2 Symbols and abbreviations I I 2.3 Bitstream characteristics . . . . . . . . . . . . . . . . . . . . . _ ._. . . . . . .
31、. . . . . . . . . . . 14 2.4 Decoder characteristics 16 2.5 Procedures to test bitstream compliance . 18 2.6 Procedures to test decoder compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Annexes A Definition of audio decoder tests
32、. 3 1 B Descriptions of the ISO/IEC 11172 (MPEG) audio test bitstreams 3 2 0 ISO/IEC 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without pe
33、rmission in writing from the publisher. ISO/IEC Copyright Office Case Postale 56 CH1211 Genkve 20 Switzerland 11 0 ISOAEC ISO/IEC 11172-4: 1995 (E) Foreword IS0 (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system fo
34、r world-wide standardization. National Bodies that are members of IS0 and IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical committees colla
35、borate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with IS0 and EC, also take part in the work. In the field of information technology, IS0 and IEC have established a joint technical committee, ISOAEC JTC 1. Draft International Stand
36、ards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 7% of the national bodies casting a vote. ISOAEC 11 172 consists of the following parts, under the general title Information technolog
37、y - Coding of moving pictures and associated audio for digital storage media at up to about 1,5 MbiiYs: - Part 1: Systems - Part 2: Video - Part 3: Audio - Part 4: Compliance testing Annex A forms an integral part of this part of ISO/IEC 11 172. Annex 3 is for information only . 111 ISO/IEC 11172-4:
38、 1995 (E) 0 ISO/IEC Introduction This International Standard was prepared by ISO/IEC JTCl/SC29/WGll also known as MPEG (Moving Pictures Expert Group). MPEG was formed in 1988 to establish an International Standard for the coded representation of moving pictures and associated audio stored on digital
39、 storage media. Parts 1, 2 and 3 of this International Standard were unanimously approved by the participating National Bodies in November 1992. This International Standard is published in four parts. Part 1 - Systems - specifies the system coding layer of the standard. It defines a multiplexed stru
40、cture for combining audio and video data and means of representing the timing information needed to replay synchronized sequences in real-time. Part 2 - video - specifies the coded representation of video data and the decoding process required to reconstruct pictures. Part 3 - audio - specifies the
41、coded representation of audio data and the decoding process required to reconstruct audio. Part 4 - compliance testing - specifies procedures to determine characteristics of coded bitstreams and to test compliance of bitstreams and decoders with the requirements specified in Parts 1,2 and 3. Parts 1
42、, 2 and 3 of ISOfiEC 11 172 specify a multiplex structure and coded representations of audiovisual information. Parts 1, 2 and 3 of ISO/IEC I1 172 allow for large flexibility, achieving suitability of this International Standard for many different applications. The flexibility is obtained by includi
43、ng parameters in the bitstream that define the characteristics of coded bitstreams. Examples are the audio sampling frequency, picture size, picture rate and bitrate parameters. This part of ISOKEC 1 1172 specifies how tests can be designed to verify whether bitstreams and decoders meet the requirem
44、ents as specified in parts 1,2 and 3 of ISOEC 11 172. These tests can be used for various purposes such as: manufacturers of encoders, and their customers, can use the tests to verify whether the encoder produces valid bitstreams. manufacturers of decoders and their customers can use the tests to ve
45、rify whether the decoder meets the requirements specified in parts 1,2 and 3 of ISOAEC 11 172 for the claimed decoder capabilities. applications can use the tests to verify whether the characteristics of a given bitstream meet the application requirements, for example whether the size of the coded p
46、icture does not exceed the maximum value allowed for the application, iv INTERNATIONAL STANDARD ISOIEC ISOAEC 11172-4: 1995 (E) Information technology - Coding of moving pictures and associated audio for digital storage media at up to about 13 Mbit/s - Part 4: Compliance testing Section 1: General 1
47、.1 Scope This part of ISOIIEC 1 1172 specifies how tests can be designed to verify whether bitstreams and decoders meet requirements specified in parts 1,2 and 3 of ISO/IEC 1 1172. In this part of ISO/IEC 1 1 172, encoders are not addressed specifically. An encoder is entitled to be an ISO/IEC 11 17
48、2 encoder if it generates bitstreams compliant with the syntactic and semantic bitstream requirements specified in parts 1,2 and 3 of ISO/IEC 11 172. Characteristics of coded bitstreams and decoders are defined for parts 1,2 and 3 of ISO/IEC 11 172. The characteristics of a bitstream define the subset of the standard that is exploited in the bitstream. Examples are the applied values or range of the picture size and bitrate parameters. Decoder characteristics define the properties and capabilities of the appIied decoding process. An example of a property is the applied arithmetic accuracy. T
