1、BSI Standards Publication BS ISO/IEC 23001-8:2016 Information technology MPEG systems technologies Part 8: Coding-independent code pointsBS ISO/IEC 23001-8:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO/IEC 23001-8:2016. It supersedes BS ISO/IEC 23001-8
2、:2013 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IST/37, Coding of picture, audio, multimedia and hypermedia information. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not
3、 purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 91632 8 ICS 35.040 Compliance with a British Standard cannot confer immunity from legal ob
4、ligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2016. Amendments issued since publication Date Text affectedBS ISO/IEC 23001-8:2016 Information technology MPEG systems technologies Part 8: Coding-independent code points Tech
5、nologies de linformation Technologies des systmes MPEG Partie 8: Points de code indpendants du codage INTERNATIONAL STANDARD ISO/IEC 23001-8 Reference number ISO/IEC 23001-8:2016(E) Second edition 2016-05-01 ISO/IEC 2016 BS ISO/IEC 23001-8:2016ii ISO/IEC 2016 All rights reserved COPYRIGHT PROTECTED
6、DOCUMENT ISO/IEC 2016, Published in Switzerland 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 photocopying, or posting on the internet or an intranet, without prior
7、 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 Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/
8、IEC 23001-8:2016(E)BS ISO/IEC 23001-8:2016ISO/IEC 23001-8:2016(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms, definitions and abbr e viat ed t erms 1 3.1 Terms and definitions . 1 3.2 Abbreviated terms . 2 4 Conventions . 2 4.1 Arithmetic operators . 2 4.2 Relational operators . 3 4.3
9、Bit-wise operators 3 4.4 Mathematical functions . 4 5 Introduction 4 5.1 General . 4 5.2 Background 5 5.3 Applicability 6 6 Principles for definition and r efer encing of c ode points . 6 6.1 Code point encoding and defaults 6 6.2 Externally defined values . 7 6.3 Reference format . 7 6.4 URN Format
10、 . 7 7 Video code points . 7 7.1 Colour primaries . 7 7.2 Transfer characteristics . 9 7.3 Matrix coefficients.11 7.4 Video frame packing type .16 7.5 Packed video content interpretation 20 7.6 Sample aspect ratio indicator 21 8 Audio code points .22 8.1 Loudspeaker index and speaker channel positio
11、n 22 8.2 Loudspeaker layout index and channel configuration.25 8.3 Loudspeaker positioning.30 8.4 Program loudness level 33 8.5 Anchor loudness level 34 8.6 Range of loudness 34 8.7 Top of loudness range 34 8.8 Maximum of momentary loudness level 34 8.9 Maximum of short-term loudness level 35 8.10 S
12、hort-term loudness level 35 8.11 Peak level 35 8.12 Compressor characteristic .35 Bibliogr aph y .38 ISO/IEC 2016 All rights reserved iii Contents PageBS ISO/IEC 23001-8:2016ISO/IEC 23001-8:2016(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrote
13、chnical Commission) 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
14、activity. ISO 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 c
15、ommittee, ISO/IEC JTC 1. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of document should be noted. This document was drafted in
16、 accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). 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 identifying any or all such patent
17、rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not con
18、stitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The
19、 committee responsible for this document is ISO/IEC JTC 1, Information technology, SC 29, Coding of audio, picture, multimedia and hypermedia information. This second edition cancels and replaces the first edition (ISO/IEC 23001-8:2013), which has been technically revised. It also incorporates the A
20、mendment ISO/IEC 23001-8:2013/Amd 1:2015 and the Technical Corrigendum ISO/IEC 23001-8:2013/Cor 1:2015. ISO/IEC 23001 consists of the following parts, under the general title Information technology MPEG systems technologies: Part 1: Binary MPEG format for XML Part 2: Fragment request units Part 3: X
21、ML IPMP messages Part 4: Codec configuration representation Part 5: Bitstream Syntax Description Language (BSDL) Part 7: Common encryption in ISO base media file format files Part 8: Coding-independent code points Part 9: Common encryption of MPEG-2 transport streams Part 10: Carriage of timed metad
22、ata metrics of media in ISO base media file format Part 11: Energy-efficient media consumption (green metadata)iv ISO/IEC 2016 All rights reservedBS ISO/IEC 23001-8:2016INTERNATIONAL ST ANDARD ISO/IEC 23001-8:2016(E) Information technology MPEG systems technologies Part 8: Coding-independent code po
23、ints 1 Scope This part of ISO/IEC 23001 defines various code points and fields that establish properties of a video or audio stream that are independent of the compression encoding and bit rate. These properties may describe the appropriate interpretation of decoded video or audio data or may, simil
24、arly, describe the characteristics of such signals before the signal is compressed by an encoder that is suitable for compressing such an input signal. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its appli
25、cation. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11664-1, Colorimetry Part 1: CIE standard colorimetric observers Rec. ITU-R BS.1770, Algorithms to measure audio programme loudn
26、ess and true-peak audio level Rec. ITU-R BS.1771-1, Requirements for loudness and true-peak indicating meters EBU R 128, Loudness normalization and permitted maximum level of audio signals EBU Tech 3341, Loudness Metering: EBU mode metering to supplement loudness normalization in accordance with EBU
27、 R128 EBU Tech 3342, Loudness Range: A measure to supplement loudness normalisation in accordance with EBU R 128 3 T erms, d efinitions and abbr e viat ed t erms 3.1 T erms and definiti ons For the purposes of this document, the following terms and definitions apply. 3.1.1 channel Ch. conceptual rep
28、resentation of an audio signal for coding or transmission as it may be used within the digital signal processing chain of an audio codec Note 1 to entry: A channel may correspond directly to one specific loudspeaker or it may carry an audio signal that is meant to be further processed and played bac
29、k on more than one loudspeaker by some means not further specified here. 3.1.2 DRC dynamic range compressor process that modifies the amplitude of an audio signal ISO/IEC 2016 All rights reserved 1BS ISO/IEC 23001-8:2016ISO/IEC 23001-8:2016(E) 3.1.3 K-weighted frequency weighting by means of a two-s
30、tage filter, as defined in Rec. ITU-R BS.1770 3.1.4 LKFS loudness, K-weighted, relative to nominal full scale, as defined in Rec. ITU-R BS.1770 3.1.5 loudspeaker LS physical loudspeaker with a given geometric position relative to the listener and, if applicable, a label or name Note 1 to entry: Even
31、 though the loudspeaker names used in this part of ISO/IEC 23001 each describe one discrete loudspeaker position, some loudspeaker signals may, in practice, be rendered on a loudspeaker array consisting of multiple loudspeakers which are all driven with the same audio signal, for example, in a theat
32、rical setting. 3.1.6 loudspeaker index association of a loudspeaker geometric position to a given index 3.1.7 loudspeaker layout set of loudspeakers with a specific constellation of geometric positions meant for authoring or play- back of audio content 3.1.8 loudspeaker layout index association of a
33、 loudspeaker layout to a given index 3.2 A bbr e viat ed t erms For the purposes of this document, the following abbreviated terms apply. LSB least-significant bit MSB most-significant bit 4 Conventions NOTE The mathematical operators used in this part of ISO/IEC 23001 are similar to those used in t
34、he C programming language. However, integer division and arithmetic shift operations are specifically defined. Numbering and counting conventions generally begin from 0. 4.1 Arithmetic operators The following arithmetic operators are defined as follows: + Addition. Subtraction (as a two-argument ope
35、rator) or negation (as a unary prefix operator). * Multiplication, including matrix multiplication. Exponentiation. Specifies x to the power of y. In other contexts, such notation is used for superscripting not intended for interpretation as exponentiation.2 ISO/IEC 2016 All rights reservedBS ISO/IE
36、C 23001-8:2016ISO/IEC 23001-8:2016(E) / Integer division with truncation of the result toward zero. For example, 7 / 4 and ( 7 ) / ( 4 ) are truncated to 1 and ( 7 ) / 4 and 7 / ( 4 ) are truncated to 1. Used to denote division in mathematical equations where no truncation or rounding is intended. U
37、sed to denote division in mathematical equations where no truncation or rounding is intended. The summation of f(i) with i taking all integer values from x up to and including y. x % y Modulus. Remainder of x divided by y, defined only for integers x and y with x = 0 and y 0. 4.2 Relational operator
38、s The following relational operators are defined as follows: greater than = greater than or equal to less than = less than or equal to = equal to != not equal to When a relational operator is applied to a syntax element or variable that has been assigned the value “na” (not applicable), the value “n
39、a” is treated as a distinct value for the syntax element or variable. The value “na” is considered not to be equal to any other value. 4.3 Bit-wise operators The following bit-wise operators are defined as follows: ; (1) Clip1 Y ( x ) = Clip3( 0, ( 1 BitDepth Y) 1, x ), (2) where BitDepth Yis the re
40、presentation bit depth of the corresponding luma colour component signal. Clip1 C ( x ) = Clip3( 0, ( 1 BitDepth C) 1, x ), (3) where BitDepth Cis the representation bit depth of the corresponding chroma colour component signal C. In general, BitDepth Cmay be distinct for different chroma colour com
41、ponents signals C, e.g. for C corresponding to Cb or Cr. (4) Floor( x ) the largest integer less than or equal to x. (5) Log10( x ) returns the base-10 logarithm of x. (6) Round( x ) = Sign( x ) * Floor( Abs( x ) + 0.5 ). (7) ; ; (8) (9) 5 Introduction 5.1 General This Clause identifies the code poi
42、nts defined in this part of ISO/IEC 23001, as listed in Table 1 with cross-references to the subclause in which each is specified.4 ISO/IEC 2016 All rights reservedBS ISO/IEC 23001-8:2016ISO/IEC 23001-8:2016(E) T a b l e 1 L i s t o f c o d e p o i n t d e f i n i t i o n s Name A b s t r ac t Su bc
43、 l a u se ColourPrimaries Video colour primaries 7.1 TransferCharacteristics Video colour transfer characteristics 7.2 M a t r i x C o ef f i c i en t s and VideoFullRangeFlag Video matrix colour coefficients 7.3 VideoFramePackingType and QuincunxSamplingFlag Video frame packing 7.4 PackedContentInt
44、erpretationType Interpretation of packed video frames 7.5 SampleAspectRatio, SarWidth, SarHeight Sample aspect ratio of video 7.6 OutputChannelPosition Audio channel assignment 8.1 C h a n n e l C on f i g u r a t ion Audio channel configuration 8.2 LoudspeakerGeometry Audio loudspeaker geometry 8.3
45、 LoudspeakerElevation Audio loudspeaker elevation 8.3 LoudspeakerAzimuth Audio loudspeaker azimuth 8.3 ProgramLoudness Audio program loudness level 8.4 AnchorLoudness Audio anchor content loudness level 8.5 LoudnessRange Range of loudness 8.6 LoudnessRangeTop Top value of loudness range 8.7 Momentar
46、yLoudnessMax Maximum Loudness (400 ms window) 8.8 ShortTermLoudnessMax Maximum Loudness (3 s window) 8.9 ShortTermLoudness Loudness (3 s window) 8.10 SamplePeakLevel Level of sample peak magnitude 8.11 TruePeakLevel Level of true peak 8.11 DrcCharacteristic Index of DRC characteristic 8.12 5.2 Backg
47、round In a number of specifications, there is a need to identify some characteristics of media that are logically independent of the compression format (for example, aspects that relate to the sourcing or presentation or the role of the media component). These media characteristics have typically be
48、en documented by fields that take an encoded value or item selected from an enumerated list, herein called code points. These code points are typically defined in the specification of compression formats to document these characteristics of the media. In past practices, the definition of these field
49、s has been copied from standard to standard, sometimes with new values being added in later standards (and sometimes with later amendments specified to add new entries to existing standards). This past practice has raised a number of issues, including the following: a) A lack of a formal way to avoid conflicting assignment
