ISO/IEC INTERNATIONAL STANDARD 23094-1 First edition 2020-10 Information technology General video coding - Part 1: Essential video coding Technologies de I'information Codage vidéo général - Partie 1: Codage vidéo essentiel Licensed copy: Imperial College, Reference number IEC IS0/IEC 23094-1:2020(E) @IS0/IEC2020 IS0/IEC 23094-1:2020(E) , Imperial College London, Version correct as of 31/10/2020 Licensed copy: Imperial College , COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 written permission. Permission can be requested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214Vernier, Geneva Phone:+41227490111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0/IEC 2020 - All rights reserved IS0/IEC 23094-1:2020(E) Contents Page Foreword. vi Introduction vii 1 Scope London, Version correct as of 31/10/2020 2 Normative references ...... 3 Terms and definitions... 4 Abbreviated terms 5 Conventions. 12 5.1 General. 12 5.2 Arithmetic operators .. 13 5.3 Logical operators. 13 5.4 Relational operators 13 5.5 Bit-wise operators 5.6 Assignment operator 14 5.7 Range notation. 5.8 Mathematical functions 14 5.9 Order of operation precedence .16 5.10 Variables, syntax elements and tables. 16 5.11 Text description of logical operations .18 5.12 Processes. 19 6 Bitstream and picture formats, partitionings, scanning processes and neighbouring relationships ...... .19 6.1 .Bitstream formats.... 6.2 Source, decoded and output picture formats ... .20 6.3 Partitioning of pictures, slices, tiles, and CTUs... .22 6.3.1 Partitioning of pictures into slices and tiles.. .22 6.3.2 Spatial or component-wise partitionings.. ...23 6.4 Availability processes. 24 6.4.1 Derivationprocessforneighbouringblockavailability 24 6.4.2 Derivation process for left and right neighbouring blocks availabilities.... 24 6.4.3 Derivation process for neighbouring block motion vector candidate availability.. .25 6.4.4 Derivation process for ALF neighbouring block availability... ..25 6.5 Scanning processes.. .26 6.5.1 CTB raster and tile scanning process ..26 6.5.2 Zig-zag scan order 1D array initialization process. 6.5.3 Inverse scan order 1D array initialization process. 29 7 Syntax and semantics ..29 7.1 Method of specifying syntax in tabular form. .29 7.2 Specification of syntax functions and descriptors.. .31 7.3 Syntax in tabular form. .32 7.3.1 NAL unit syntax... .32 7.3.2 Raw byte sequence payloads, trailing bits and byte alignment syntax .... 33 7.3.3 Supplemental enhancement information message syntax . 38 7.3.4 Slice header syntax. 39 7.3.5 Adaptive loop filter data syntax 41 7.3.6 DRA data syntax... 42 @IS0/IEC2020-Allrightsreserved ili IS0/IEC23094-1:2020(E) 7.3.7 Reference picture list structure syntax 43 7.3.8 Slice data syntax ... 7.4 Semantics.. ..56 7.4.1 56 7.4.2 NAL unit semantics... ..56 7.4.3 Raw byte sequence payloads, trailing bits and byte alignment semantics 60 tas of 31/10/2020 7.4.4 Supplemental enhancement information message semantics.... 7.4.5 Slice header semantics... .74 7.4.6 Adaptive loop filter data semantics... ..79 7.4.7 84 7.4.8 Reference picture list structure semantics.. ..86 7.4.9 Slice data semantics . ..88 8 Decoding process .... ..105 8.1 General decoding proces.. ..105 8.2 NAL unit decoding process .... ..105 8.3 Slice decoding process ... ...105 8.3.1 Decoding process for picture order count... 8.3.2 Decoding process for reference picture lists construction.... .107 8.3.3 Decoding process for reference picture marking .. .111 8.3.4 Decoding process for collocated picture .... 8.4 Decoding process for coding units