1、BSI Standards PublicationBS ISO/IEC 23008-8:2015Part 8: Conformance Specification for HEVCInformation technology High efficiency codingand media delivery inheterogeneous environmentsBS ISO/IEC 23008-8:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO/IEC2300
2、8-8:2015.The UK participation in its preparation was entrusted to TechnicalCommittee IST/37, Coding of picture, audio, multimedia andhypermedia information.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include al
3、l the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 83301 4ICS 35.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Stand
4、ard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO/IEC 23008-8:2015Reference numberISO/IEC 23008-8:2015(E)ISO/IEC 2015INTERNATIONAL STANDARD ISO/IEC23008-8First edition2
5、015-04-15Information technology High efficiency coding and media delivery in heterogeneous environments Part 8: Conformance Specification for HEVC Technologies de linformation Codage haute efficacit et livraison des mdias dans des environnements htrognes Partie 8: Spcification de conformit du codage
6、 video haute efficacitBS ISO/IEC 23008-8:2015ISO/IEC 23008-8:2015(E) COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photoco
7、pying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 4
8、7 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2015 All rights reservedBS ISO/IEC 23008-8:2015ISO/IEC 23008-8:2015(E) ISO/IEC 2015 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commi
9、ssion) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO
10、 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO
11、/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to nationa
12、l bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for
13、identifying any or all such patent rights. ISO/IEC 23008-8 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, in collaboration with ITU-T. The identical text is published as ITU-T H.265
14、 (08/2014). BS ISO/IEC 23008-8:2015BS ISO/IEC 23008-8:2015Page: 1 Date Saved: 2014-08-26HEVC Conformance Testing 1 Scope This Recommendation | International Standard1specifies a set of tests and procedures designed to indicate whether encoders or decoders meet the normative requirements specified in
15、 Rec. ITU-T H.265 | ISO/IEC 23008-2. 2 Normative references 2.1 General The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recommendation | International Standard. At the time of publication, the editions
16、indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation | International Standard are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Member
17、s of IEC and ISO maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. 2.2 Identical Recommendations | International Standards None.2.3 Paired Recommendations | International S
18、tandards equivalent in technical content Recommendation ITU-T H.265 (in force), High efficiency video coding. ISO/IEC 23008-2: in force, Information technology High efficiency video coding and mediadelivery in heterogeneous environment Part 2: High Efficiency Video Coding. Recommendation ITU-T H.265
19、.2 (in force), High efficiency coding reference software. ISO/IEC 23008-5: in force, Information technology High efficiency video coding and mediadelivery in heterogeneous environment Part 2: High Efficiency Video Coding Reference Software.2.4 Additional references None.3 Definitions For the purpose
20、s of this Recommendation | International Standard, the terms, definitions, abbreviations and symbols specified in Rec. ITU-T H.265 | ISO/IEC 23008-2 (particularly in clauses 3) apply. The following terms are further clarified for purposes herein as follows. 3.1 bitstream: A Rec. ITU-T H.265 | ISO/IE
21、C 23008-2 video bitstream. 3.2 decoder: A Rec. ITU-T H.265 | ISO/IEC 23008-2 video decoder, i.e., an embodiment of the decoding process specified by Rec. ITU-T H.265 | ISO/IEC 23008-2. The decoder does not include the display process, which is outside the scope of this Recommendation | International
22、 Standard. 1This Recommendation | International Standard includes an electronic attachment containing the conformance bitstreams identified within the text. ISO/IEC 2015 All rights reserved BS ISO/IEC 23008-8:2015ISO/IEC 23008-8:2015(E) BS ISO/IEC 23008-8:2015Page: 2 Date Saved: 2014-08-263.3 encode
23、r: An embodiment of a process, not specified in this Recommendation | International Standard (except in regard to identification of the reference software encoder), that produces a bitstream. 3.4 reference software decoder: The software decoder provided in Rec. ITU-T H.265.2 | ISO/IEC 23008-5. 3.5 r
24、eference software encoder: The software encoder provided in Rec. ITU-T H.265.2 | ISO/IEC 23008-5. 4 Abbreviations and acronyms For the purposes of this Recommendation | International Standard, relevant abbreviations and acronyms are specified in clause 4 of Rec. ITU-T H.265 | ISO/IEC 23008-2. 5 Conv
25、entions For the purposes of this Recommendation | International Standard, relevant conventions are specified in clause 5 of Rec. ITU-T H.265 | ISO/IEC 23008-2. 6 Conformance testing for ITU-T H.265 | ISO/IEC 23008-2 6.1 Introduction The following clauses specify normative tests for verifying conform
26、ance of video bitstreams as well as decoders. Those normative tests make use of test data (bitstream test suites) provided as an electronic annex to this Recommendation | International Standard and the reference software decoder specified in Rec. ITU-T H.265.2 | ISO/IEC 23008-5. 6.2 Bitstream confor
27、mance Bitstream conformance for Rec. ITU-T H.265 | ISO/IEC 23008-2 is specified by clause C.4 of Rec. ITU-T H.265 | ISO/IEC 23008-2. 6.3 Decoder conformance Decoder conformance for Rec. ITU-T H.265 | ISO/IEC 23008-2 is specified by clause C.5 of Rec. ITU-T H.265 | ISO/IEC 23008-2. 6.4 Procedure to t
28、est bitstreams A bitstream that claims conformance with Rec. ITU-T H.265 | ISO/IEC 23008-2 shall pass the following normative test. The bitstream shall be decoded by processing it with the reference software decoder. When processed by the reference software decoder, the bitstream shall not cause any
29、 error or non-conformance messages to be reported by the reference software decoder. This test should not be applied to bitstreams that are known to contain errors introduced by transmission, as such errors are highly likely to result in bitstreams that lack conformance to Rec. ITU-T H.265 | ISO/IEC
30、 23008-2. Successfully passing the reference software decoder test provides only a strong presumption that the bitstream under test is conforming to the video layer, i.e., that it does indeed meet all the requirements for the video layer (except Annexes C, D and E) specified in Rec. ITU-T H.265 | IS
31、O/IEC 23008-2 that are tested by the reference software decoder. Additional tests may be necessary to more thoroughly check that the bitstream properly meets all the requirements specified in Rec. ITU-T H.265 | ISO/IEC 23008-2 including the hypothetical reference decoder (HRD) conformance (based on
32、Annexes C, D and E). These complementary tests may be ISO/IEC 2015 All rights reserved BS ISO/IEC 23008-8:2015ISO/IEC 23008-8:2015(E) BS ISO/IEC 23008-8:2015Page: 3 Date Saved: 2014-08-26performed using other video bitstream verifiers that perform more complete tests than those implemented by the re
33、ference software decoder. Rec. ITU-T H.265 | ISO/IEC 23008-2 contains several informative recommendations that are not an integral part of that Recommendation | International Standard. When testing a bitstream for conformance, it may also be useful to test whether or not the bitstream follows those
34、recommendations. To check correctness of a bitstream, it is necessary to parse the entire bitstream and to extract all the syntax elements and other values derived from those syntactic elements and used by the decoding process specified in Rec. ITU-T H.265 | ISO/IEC 23008-2. A verifier may not neces
35、sarily perform all stages of the decoding process specified in Rec. ITU-T H.265 | ISO/IEC 23008-2 in order to verify bitstream correctness. Many tests can be performed on syntax elements in a state prior to their use in some processing stages. 6.5 Procedure to test decoder conformance 6.5.1 Conforma
36、nce bitstreams A bitstream has values of general_profile_idc, general_tier_flag, and general_level_idc corresponding to a set of specified constraints on a bitstream for which a decoder conforming to a specified profile, tier, and level is required in Annex A of Rec. ITU-T H.265 | ISO/IEC 23008-2 to
37、 properly perform the decoding process. 6.5.2 Contents of the bitstream file The conformance bitstreams are included in this Recommendation | International Standard as an electronic attachment. The following information is included in a single zipped file for each such bitstream. bitstream; decoded
38、pictures or hashes of decoded pictures (may not be present); short description of the bitstream; trace file (results while decoding the bitstream, in ASCII format).In cases where the decoded pictures or hashes of decoded pictures are not available, the reference software decoder shall be used to gen
39、erate the necessary reference decoded pictures from the bitstream. 6.5.3 Requirements on output of the decoding process and timing Two classes of decoder conformance are specified: output order conformance; and output timing conformance.The output of the decoding process is specified in clause 8 and
40、 Annex C of Rec. ITU-T H.265 | ISO/IEC 23008-2. For output order conformance, it is a requirement that all of the decoded pictures specified for output in Annex C of Rec. ITU-T H.265 | ISO/IEC 23008-2 shall be output by a conforming decoder in the specified order and that the values of the decoded s
41、amples in all of the pictures that are output shall be (exactly equal to) the values specified in clause 8 of Rec. ITU-T H.265 | ISO/IEC 23008-2. For output timing conformance, it is a requirement that a conforming decoder shall also output the decoded samples at the rates and times specified in Ann
42、ex C of Rec. ITU-T H.265 | ISO/IEC 23008-2. The display process, which ordinarily follows the output of the decoding process, is outside the scope of this Recommendation | International Standard. ISO/IEC 2015 All rights reserved BS ISO/IEC 23008-8:2015ISO/IEC 23008-8:2015(E) BS ISO/IEC 23008-8:2015P
43、age: 4 Date Saved: 2014-08-266.5.4 Recommendations (informative) This clause does not form an integral part of this Recommendation | International Standard. In addition to the requirements, it is desirable that conforming decoders implement various informative recommendations specified in Rec. ITU-T
44、 H.265 | ISO/IEC 23008-2 that are not an integral part of that Recommendation | International Standard. This clause discusses some of these recommendations. It is recommended that a conforming decoder be able to resume the decoding process as soon as possible after the loss or corruption of part of
45、a bitstream. In most cases it is possible to resume decoding at the next start code or slice header. It is recommended that a conforming decoder be able to perform concealment for the coding tree blocks or video packets for which all the coded data has not been received. 6.5.5 Static tests for outpu
46、t order conformance Static tests of a video decoder require testing of the decoded samples. This clause will explain how this test can be accomplished when the decoded samples at the output of the decoding process are available. It may not be possible to perform this type of test with a production d
47、ecoder (due to the lack of an appropriate accessible interface in the design at which to perform the test). In that case this test should be performed by the manufacturer during the design and development phase. Static tests are used for testing the decoding process. The test will check that the val
48、ues of the samples decoded by the decoder under test shall be identical to the values of the samples decoded by the reference decoder. When a hash of the values of the samples of the decoded pictures is attached to the bitstream file, a corresponding hash operation performed on the values of the sam
49、ples of the decoded pictures produced by the decoder under test shall produce the same results. 6.5.6 Dynamic tests for output timing conformance Dynamic tests are applied to check that all the decoded samples are output and that the timing of the output of the decoders decoded samples conforms to the specification of clause 8 and Annex C of Rec. ITU-T H.265 | ISO/IEC 23008-2, and to verify that the HRD models (as specified by the CPB and DPB specification in Annex C of Rec. ITU-T H.265 | ISO/IEC 23008-2) are not viol
