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International
Standard
ISO/IEC 23090-3
Third edition
Information technology — Coded
2024-07
representation of immersive media —
Part 3:
Versatile video coding
Technologies de l'information — Représentation codée de média
immersifs —
Partie 3: Codage vidéo polyvalent
Reference number
© ISO/IEC 2024
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Published in Switzerland
© ISO/IEC 2024 – All rights reserved
ii
Contents
Foreword . vi
Introduction .vi i
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 17
5 Conventions . 19
5.1 General . 19
5.2 Arithmetic operators . 19
5.3 Logical operators . 20
5.4 Relational operators . 20
5.5 Bit-wise operators . 20
5.6 Assignment operators . 21
5.7 Range notation . 21
5.8 Mathematical functions . 21
5.9 Order of operation precedence . 22
5.10 Variables, syntax elements and tables . 22
5.11 Text description of logical operations . 24
5.12 Processes . 25
6 Bitstream and picture formats, partitionings, scanning processes and
neighbouring relationships . 25
6.1 Bitstream formats . 25
6.2 Source, decoded and output picture formats . 26
6.3 Partitioning of pictures, subpictures, slices, tiles, and CTUs . 28
6.3.1 Partitioning of pictures into subpictures, slices, and tiles . 28
6.3.2 Block, quadtree and multi-type tree structures . 30
6.3.3 Spatial or component-wise partitionings . 31
6.4 Availability processes . 32
6.4.1 Allowed quad split process . 32
6.4.2 Allowed binary split process . 33
6.4.3 Allowed ternary split process . 35
6.4.4 Derivation process for neighbouring block availability . 36
6.5 Scanning processes. 36
6.5.1 CTB raster scanning, tile scanning, and subpicture scanning processes . 36
6.5.2 Up-right diagonal scan order array initialization process . 41
6.5.3 Horizontal and vertical traverse scan order array initialization process. 41
7 Syntax and semantics . 42
7.1 Method of specifying syntax in tabular form . 42
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 . 46
7.3.3 Profile, tier, and level syntax . 65
7.3.4 DPB parameters syntax . 68
7.3.5 Timing and HRD parameters syntax . 68
7.3.6 Supplemental enhancement information message syntax . 69
7.3.7 Slice header syntax . 70
© ISO/IEC 2024 – All rights reserved
iii
7.3.8 Weighted prediction parameters syntax .72
7.3.9 Reference picture lists syntax .73
7.3.10 Reference picture list structure syntax .74
7.3.11 Slice data syntax .74
7.4 Semantics. 97
7.4.1 General .97
7.4.2 NAL unit semantics .97
7.4.3 Raw byte sequence payloads, trailing bits and byte alignment semantics . 106
7.4.4 Profile, tier, and level semantics . 166
7.4.5 DPB parameters semantics . 173
7.4.6 Timing and HRD parameters semantics . 174
7.4.7 Supplemental enhancement information message semantics . 178
7.4.8 Slice header semantics . 178
7.4.9 Weighted prediction parameters semantics . 189
7.4.10 Reference picture lists semantics . 191
7.4.11 Reference picture list structure semantics . 192
7.4.12 Slice data semantics . 193
8 Decoding process .22 0
8.1 General decoding process .22 0
8.2 NAL unit decoding process .22 3
8.3 Slice decoding process .22 4
8.3.1 Decoding process for picture order count. 224
8.3.2 Decoding process for reference picture lists construction . 225
8.3.3 Decoding process for reference picture marking . 231
8.3.4 Decoding process for generating unavailable reference pictures . 232
8.3.5 Decoding process for symmetric motion vector difference reference indices . 233
8.3.6 Decoding process for collocated picture and no backward prediction . 234
8.4 Decoding process for coding units coded in intra prediction mode . 234
8.4.1 General decoding process for coding units coded in intra prediction mode . 234
8.4.2 Derivation process for luma intra prediction mode . 236
8.4.3 Derivation process for chroma intra prediction mode . 239
8.4.4 Cross-component chroma intra prediction mode checking process . 241
8.4.5 Decoding process for intra blocks . 243
8.5 Decoding process for coding units coded in inter prediction mode . 278
8.5.1 General decoding process for coding units coded in inter prediction mode . 278
8.5.2 Derivation process for motion vector components and reference indices . 284
8.5.3 Decoder-side motion vector refinement process . 306
8.5.4 Derivation process for geometric partitioning mode motion vector
components and reference indices . 312
8.5.5 Derivation process for subblock motion vector components and reference
indices. 314
8.5.6 Decoding process for inter blocks . 345
8.5.7 Decoding process for geometric partitioning mode inter blocks . 370
8.5.8 Decoding process for the residual signal of coding blocks coded in inter
prediction mode . 376
8.5.9 Decoding process for the reconstructed signal of chroma coding blocks
coded in inter prediction mode . 378
8.6 Decoding process for coding units coded in IBC prediction mode . 380
8.6.1 General decoding process for coding units coded in IBC prediction mode . 380
8.6.2 Derivation process for block vector components for IBC blocks . 383
8.6.3 Decoding process for IBC blocks . 387
8.7 Scaling, transformation and array construction process . 388
8.7.1 Derivation process for quantization parameters . 388
8.7.2 Scaling and transformation process. 390
8.7.3 Scaling process for transform coefficients .
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