ISO/IEC 23090-26:2025

International
Standard
ISO/IEC 23090-26
First edition
Information technology — Coded
2025-06
representation of immersive media —
Part 26:
Conformance and reference
software for carriage of geometry-
based point cloud compression data
Reference number
© ISO/IEC 2025
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© ISO/IEC 2025 – All rights reserved
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Reference software for ISO/IEC 23090-18 . 1
5.1 General .1
5.2 Architecture .2
5.3 Feature support list .2
5.4 G-PCC carriage library API.3
5.4.1 General .3
5.4.2 GPCCCreateBox .4
5.4.3 GPCCParseBox .4
5.4.4 GPCCParseUnknownBox .4
5.4.5 GPCCNewBitstreamSampleEntry .4
5.4.6 GPCCNewMultiTrackGPCCSampleEntry .4
5.4.7 GPCCSetGPCCConfigurationRecord .5
5.4.8 GPCCGetConfigurationFromSampleEntry.5
5.4.9 GPCCAddGPCCParameterSet .6
5.4.10 GPCCGetGPCCParameterSet.6
5.4.11 GPCCGetGPCCParameterSets .6
5.4.12 GPCCGetGPCCParameterSetsFromItemProperty .6
5.4.13 GPCCSetGPCCComponentInfo .7
5.4.14 GPCCGetGPCCComponentInfoFromSampleEntry .7
5.5 Usage of GPCCCarriageApp .7
5.6 Copyright disclaimer for software modules .8
6 Conformance for ISO/IEC 23090-18 . 9
6.1 General .9
6.2 Timed G-PCC .9
6.3 Non-timed G-PCC .10
Bibliography .11

© ISO/IEC 2025 – All rights reserved
iii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
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 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.
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 accordance with the editorial rules of the ISO/
IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23090 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.

© ISO/IEC 2025 – All rights reserved
iv
Introduction
The conformance and reference software in this document serves two main purposes:
— validation of the written specification of ISO/IEC 23090-18;
— conformance testing for checking interoperability for the various applications against the reference
software which aims to be compliant with ISO/IEC 23090-18.
The reference software is structured as an extension of the ISOBMFF reference software library and provides
additional functions required for ISO/IEC 23090-18. In addition, it includes a small command line application
that uses the library to perform some basic file operations such as multiplexing and demultiplexing a file.
Furthermore, this document is accompanied by a collection of conformance files. These files provide practical
demonstrations of various features of ISO/IEC 23090-18, aiding in a more comprehensive understanding
and application of the standard.

© ISO/IEC 2025 – All rights reserved
v
International Standard ISO/IEC 23090-26:2025(en)
Information technology — Coded representation of
immersive media —
Part 26:
Conformance and reference software for carriage of
geometry-based point cloud compression data
1 Scope
This document specifies the reference software and conformance suite for carriage of G-PCC data as
specified in ISO/IEC 23090-18. The information provided describes the reference software modules and the
features that it supports. It includes the status of the development of the reference software for ISOBMFF
encapsulation of carriage of G-PCC data. It also provides a description of how the reference software can be
utilized and a description of conformance test vectors.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 23090-18, Information technology — Coded representation of immersive media — Part 18: Carriage of
geometry-based point cloud compression data
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Abbreviated terms
API application programming interface
G-PCC geometry-based point cloud compression
ISOBMFF ISO base media file format
N/A not applicable
5 Reference software for ISO/IEC 23090-18
5.1 General
The reference software and conformance files are available at:

© ISO/IEC 2025 – All rights reserved
https:// standards .iso .org/ iso -iec/ 23090/ -26/ ed -1/ en/
5.2 Architecture
Figure 1 shows a simplified overview of the reference software implementation architecture for the
carriage of G-PCC coded data. The reference software implementation implements the features defined
[1]
in ISO/IEC 23090-18 and is based on the reference software for ISOBMFF, the reference software for
[2]
ISO/IEC 23090-9 and other supporting libraries. Boxes with a gray background in Figure 1 are part of the
scope of the reference software implementation and are described in more detail in the following clauses.
Figure 1 — Architecture overview
The reference software implementation consists of the G-PCC carriage library libGPCCCarriage, and the
command line application with the GPCCCarriageApp. While the library implements an API to parse and
write data structures as defined in ISO/IEC 23090-18, the command line application uses this API together
with other helping libraries to implement actual multiplexing and demultiplexing functionality.
5.3 Feature support list
Table 1 summarizes a list of features specified in ISO/IEC 23090-18 and indicates which features are
currently supported by the reference software.
Table 1 — Supported feature list in G-PCC reference software
Feature 4CCs Version Status
Common GPCCConfigurationBox gpcC 0 OK
GPCCComponentInfoBox ginf 0 OK
TileInventoryInfoEntry gtii 0 Not implemented
Single GPCCSampleEntry (single track) gpe1
OK
track gpeg 0
Multiplexer N/A OK
Demultiplexer N/A OK
Sub-samples N/A OK
Multi track GPCCSampleEntry (multiple tracks) gpc1
OK
gpcg 0
Multiplexer N/A OK
Demultiplexer N/A OK
Sub-samples N/A Not implemented
track reference gpca OK
© ISO/IEC 2025 – All rights reserved
TTabablele 1 1 ((ccoonnttiinnueuedd))
Feature 4CCs Version Status
Multi track GPCCSampleEntry (Tile-base track) gpeb
In progress
with tile gpcb 0
tracks
GPCCTileSampleEntry gpt1 0 In progress
GPCCTileConfigurationBox gptC In progress
Multiplexer (tile base track and tile track) N/A Not implemented
Demultiplexer (tile base track a
...