1、Information technology High efficiency coding and media delivery in heterogeneous environments Part 2:High efficiency video codingTechnologies de linformation Codage haute efficacit et livraison des medias dans des environnements htrognes Partie 2:Codage vido haute efficacit ISO/IEC 2020INTERNATIONA
2、L STANDARDISO/IEC23008-2Reference numberISO/IEC 23008-2:2020(E)Fourth edition 2020-08 ISO/IEC 23008-2:2020(E)ii ISO/IEC 2020 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO/IEC 2020All rights reserved.Unless otherwise specified,or required in the context of its implementation,no part of this pub
3、lication 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 written permission.Permission can be requested from either ISO at the address below or ISOs member body in the country
4、of the requester.ISO copyright officeCP 401 Ch.de Blandonnet 8CH-1214 Vernier,GenevaPhone:+41 22 749 01 11Email:copyrightiso.orgWebsite:www.iso.orgPublished in SwitzerlandISO/IEC 23008-2:2020(E)ISO/IEC 2020 All rights reserved iii Contents Page Foreword.vii Introduction.viii 1 Scope.1 2 Normative re
5、ferences.1 3 Terms and definitions.1 4 Abbreviated terms.21 5 Conventions.23 5.1 General.23 5.2 Arithmetic operators.23 5.3 Logical operators.23 5.4 Relational operators.24 5.5 Bit-wise operators.24 5.6 Assignment operators.24 5.7 Range notation.25 5.8 Mathematical functions.25 5.9 Order of operatio
6、n precedence.26 5.10 Variables,syntax elements,and tables.27 5.11 Text description of logical operations.28 5.12 Processes.29 6 Bitstream and picture formats,partitionings,scanning processes,and neighbouring relationships.30 6.1 Bitstream formats.30 6.2 Source,decoded,and output picture formats.30 6
7、.3 Partitioning of pictures,slices,slice segments,tiles,CTUs,and CTBs.33 6.3.1 Partitioning of pictures into slices,slice segments,and tiles.33 6.3.2 Block and quadtree structures.34 6.3.3 Spatial or component-wise partitionings.35 6.4 Availability processes.36 6.4.1 Derivation process for z-scan or
8、der block availability.36 6.4.2 Derivation process for prediction block availability.37 6.5 Scanning processes.38 6.5.1 CTB raster and tile scanning conversion process.38 ISO/IEC 23008-2:2020(E)iv ISO/IEC 2020 All rights reserved 6.5.2 Z-scan order array initialization process.39 6.5.3 Up-right diag
9、onal scan order array initialization process.40 6.5.4 Horizontal scan order array initialization process.40 6.5.5 Vertical scan order array initialization process.41 6.5.6 Traverse scan order array initialization process.41 7 Syntax and semantics.41 7.1 Method of specifying syntax in tabular form.41
10、 7.2 Specification of syntax functions and descriptors.43 7.3 Syntax in tabular form.45 7.3.1 NAL unit syntax.45 7.3.2 Raw byte sequence payloads,trailing bits,and byte alignment syntax.45 7.3.3 Profile,tier and level syntax.54 7.3.4 Scaling list data syntax.57 7.3.5 Supplemental enhancement informa
11、tion message syntax.58 7.3.6 Slice segment header syntax.59 7.3.7 Short-term reference picture set syntax.63 7.3.8 Slice segment data syntax.64 7.4 Semantics.80 7.4.1 General.80 7.4.2 NAL unit semantics.80 7.4.3 Raw byte sequence payloads,trailing bits,and byte alignment semantics.90 7.4.4 Profile,t
12、ier,and level semantics.113 7.4.5 Scaling list data semantics.117 7.4.6 Supplemental enhancement information message semantics.120 7.4.7 Slice segment header semantics.121 7.4.8 Short-term reference picture set semantics.130 7.4.9 Slice segment data semantics.133 ISO/IEC 23008-2:2020(E)ISO/IEC 2020
13、All rights reserved v 8 Decoding process.149 8.1 General decoding process.149 8.1.1 General.149 8.1.2 CVSG decoding process.150 8.1.3 Decoding process for a coded picture with nuh_layer_id equal to 0.150 8.2 NAL unit decoding process.153 8.3 Slice decoding process.153 8.3.1 Decoding process for pict
14、ure order count.153 8.3.2 Decoding process for reference picture set.154 8.3.3 Decoding process for generating unavailable reference pictures.159 8.3.4 Decoding process for reference picture lists construction.160 8.3.5 Decoding process for collocated picture and no backward prediction flag.161 8.4
15、Decoding process for coding units coded in intra prediction mode.162 8.4.1 General decoding process for coding units coded in intra prediction mode.162 8.4.2 Derivation process for luma intra prediction mode.166 8.4.3 Derivation process for chroma intra prediction mode.169 8.4.4 Decoding process for
16、 intra blocks.170 8.5 Decoding process for coding units coded in inter prediction mode.183 8.5.1 General decoding process for coding units coded in inter prediction mode.183 8.5.2 Inter prediction process.184 8.5.3 Decoding process for prediction units in inter prediction mode.187 8.5.4 Decoding process for the residual signal of coding units coded in inter prediction mode220 8.6 Scaling,transformation and array construction process prior to deblocking filter process.224 8.6.1 Derivation process
