ISO/IEC 23008-3:2026/Amd 1

• Status: Not Published
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29/WG 6 - MPEG Audio coding
• Current Stage: 6000 - International Standard under publication
• Start Date: 19-Sep-2026
• Completion Date: 26-Sep-2026

• Amends: ISO/IEC 23008-3:2026 - Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 3: 3D audio
• Effective Date: 08-Nov-2025

Overview

ISO/IEC 23008-3:2026/Amd 1 is an amendment to the international standard for high efficiency coding and media delivery in heterogeneous environments, specifically addressing Part 3: 3D Audio. This amendment introduces media authenticity features to 3D audio bitstreams, enhancing integrity, reliability, and trust in high-efficiency audio delivery systems. By defining new syntax and semantics for handling authentication data, the amendment enables robust verification of audio content across varied platforms and applications.

Key Topics

• Media Authenticity in 3D Audio: The amendment specifies how to embed authenticating information within MPEG-H 3D audio bitstreams using MHAS (MPEG-H Audio Stream) packets.
• New Packet Types: The standard introduces new MHASPacketTypes such as PACTYP_AUTH_START, PACTYP_AUTH_SIG, PACTYP_UUID, PACTYP_TIMESTAMP, PACTYP_AUTH_TAG, and PACTYP_AUTH_SEQUENCE_AU_COUNTER to carry different media authenticity data.
• Authentication Syntax and Semantics: Each authenticity-related packet type has a defined structure and purpose, such as carrying digital signatures, sequence counters, universal unique identifiers (UUIDs), and timestamps.
• Optional Implementation: Media authenticity is optional-decoders in applications not requiring authenticity can ignore related packets, ensuring backward compatibility and flexible integration.
• Hashing Algorithms and Providers: The amendment references recognized hash functions (SHA-1, SHA-224, SHA-256, SHA-384, SHA-512) for signature calculation, and allows extensibility via authentication provider identifiers.
• Adaptive Bitrate Support: The packet structure supports authentication of streams with adaptive bitrate (ABR) schemes, ensuring integrity in dynamic streaming environments.
• Multi-Stream & Resilience Levels: Authentication information can be signaled for multi-stream scenarios and across multiple resilience levels, offering robust protection for complex media scenarios.

Applications

ISO/IEC 23008-3:2026/Amd 1 is applicable in a wide range of use cases, particularly where 3D audio content integrity is critical:

• Broadcast and Streaming Services: Ensures transmitted or streamed 3D audio content is authentic and untampered, supporting content protection in professional audio streaming platforms.
• Media Archiving: Enables long-term verification of audio assets in archives, essential for legal compliance and digital preservation.
• Digital Rights Management (DRM): Complements existing DRM systems by adding robust, stream-integrated authenticity markers.
• Multimedia Synchronization: UUIDs and timestamps allow cross-referencing with other media types (such as video), improving asset management and content synchronization.
• Interactive and Immersive Media: Games, virtual reality, and augmented reality environments benefit from trustworthy, verifiable 3D audio assets.
• Forensic and Legal Media: Supports chain-of-custody and evidentiary requirements by embedding signatures and timestamps at the bitstream level.

Related Standards

• ISO/IEC 23008-3:2026
  Core standard for MPEG-H 3D audio, defining underlying codecs and media transport.

• IETF RFC 3986
  Uniform Resource Identifier (URI) Syntax - referenced for embedding source URIs in authenticity metadata.

• IETF RFC 9562
  Universally Unique Identifiers (UUIDs) - specifies UUID syntax used in packet payloads for unique stream identification.

• ISO/IEC 23001-17
  Media timing and timestamp management, utilized for precise audio timestamping and synchronization.

• ISO/IEC 14496-3
  Advanced Audio Coding (AAC) and error-checking (CRC) methods referenced in signature processes.

By integrating media authenticity into 3D audio streams, ISO/IEC 23008-3:2026/Amd 1 sets the foundation for secure, trustworthy, and interoperable content delivery across modern connected media environments, meeting crucial needs in digital media protection, authenticity verification, and rights management.

Keywords: media authenticity, MPEG-H 3D audio, ISO/IEC 23008-3, MHAS, digital signature, audio content protection, multimedia authentication, ABR, UUID, audio streaming integrity.

FINAL DRAFT
Amendment
ISO/IEC
23008-3:2026/
FDAM 1
ISO/IEC JTC 1/SC 29
Information technology — High
Secretariat: JISC
efficiency coding and media
Voting begins on:
delivery in heterogeneous
2026-07-24
environments —
Voting terminates on:
2026-09-18
Part 3:
3D audio
AMENDMENT 1: Media authenticity
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/IEC 23008­3:2026/FDAM 1:2026(en) © ISO/IEC 2026

FINAL DRAFT
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Amendment
ISO/IEC
23008-3:2026/
FDAM 1
ISO/IEC JTC 1/SC 29
Information technology — High
Secretariat: JISC
efficiency coding and media
Voting begins on:
delivery in heterogeneous
environments —
Voting terminates on:
Part 3:
3D audio
AMENDMENT 1: Media authenticity
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO/IEC 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/IEC 23008­3:2026/FDAM 1:2026(en) © ISO/IEC 2026

© ISO/IEC 2026 – All rights reserved
ii
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
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 23008 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 2026 – All rights reserved
iii
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Information technology — High efficiency coding and media
delivery in heterogeneous environments —
Part 3:
3D audio
AMENDMENT 1: Media authenticity

Add the following at the end of Section 2:
IETF RFC 3986, Uniform Resource Identifier (URI): Generic Syntax
IETF RFC 9562, Universally Unique IDentifiers (UUIDs)

14.2.1, Table 223
Replace Table 223 with the following:
Syntax No. of bits Mnemonic
MHASPacketPayload(MHASPacketType)
{
switch (MHASPacketType) {
case PACTYP_SYNC:
0xA5;                    /* syncword*/ 8 uimsbf
break;
case PACTYP_MPEGH3DACFG:
mpegh3daConfig();
break;
case PACTYP_MPEGH3DAFRAME:
mpegh3daFrame();
break;
case PACTYP_AUDIOSCENEINFO:
mae_AudioSceneInfo();
break;
case PACTYP_FILLDATA:
for (i=0; i< MHASPacketLength; i++) {
mhas_fill_data_byte(i); 8 bslbf
}
break;
case PACTYP_SYNCGAP:
syncSpacingLength = escapedValue(16,24,24); 16,40,64 uimsbf
break;
© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Syntax No. of bits Mnemonic
case PACTYP_MARKER:
for (i=0; i< MHASPacketLength; i++) {
marker_byte(i); 8 bslbf
}
break;
case PACTYP_CRC16:
mhasParity16Data; 16 bslbf
break;
case PACTYP_CRC32:
mhasParity32Data; 32 bslbf
break;
case PACTYP_GLOBAL_CRC16:
global_CRC_type; 2 bslbf
numProtectedPackets; 6 bslbf
mhasParity16Data; 16 bslbf
break;
case PACTYP_ GLOBAL_CRC32:
global_CRC_type; 2 bslbf
numProtectedPackets; 6 bslbf
mhasParity32Data; 32 bslbf
break;
case PACTYP_DESCRIPTOR:
for (i=0; i< MHASPacketLength; i++) {
mhas_descriptor_data_byte(i); 8 bslbf
}
break;
case PACTYP_USERINTERACTION:
mpegh3daElementInteraction();
break;
case PACTYP_LOUDNESS_DRC:
mpegh3daLoudnessDrcInterface();
break;
case PACTYP_BUFFERINFO:
mhas_buffer_fullness_present 1 uimsbf
if (mhas_buffer_fullness_present)
mhas_buffer_fullness = escapedValue(15,24,32); 15,39,71 uimsbf
}
break;
case PACTYP_AUDIOTRUNCATION:
audioTruncationInfo();
break;
case PACTYP_GENDATA:
GenDataPayload();
break;
case PACTYP_EARCON:
© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Syntax No. of bits Mnemonic
earconInfo();
break;
case PACTYP_PCMCONFIG:
pcmDataConfig();
break;
case PACTYP_PCMDATA:
pcmDataPayload();
break;
case PACTYP_LOUDNESS:
mpegh3daLoudnessInfoSet();
break;
case PACTYP_AUTH_START:
mpegh3daAuthStart();
break;
case PACTYP_AUTH_SIG:
mpegh3daAuthSig();
break;
case PACTYP_UUID:
authUUID();
break;
case PACTYP_TIMESTAMP:
authTimestamp();
break;
case PACTYP_AUTH_TAG:
mpegh3daAuthResilienceTag();
break;
case PACTYP_AUTH_SEQUENCE_AU_COUNTER:
mpegh3daAuthSequenceAUCounter();
break;
}
ByteAlign();
}
14.3.1, Table 226
Replace Table 226 with the following:
Table 1 — MHASPacketType   Table 2 — Value
PACTYP_FILLDATA 0
PACTYP_MPEGH3DACFG 1
PACTYP_MPEGH3DAFRAME 2
PACTYP_AUDIOSCENEINFO 3
/* reserved for ISO use */ 4-5
Application-specific MHASPacketType values are mandated to be in the space reserved for use outside
of ISO scope. These shall be skipped by a decoder as a minimum of structure is required by the decoder
to skip these extensions.
© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Table 1 — MHASPacketType   Table 2 — Value
PACTYP_SYNC 6
PACTYP_SYNCGAP 7
PACTYP_MARKER 8
PACTYP_CRC16 9
PACTYP_CRC32 10
PACTYP_DESCRIPTOR 11
PACTYP_USERINTERACTION 12
PACTYP_LOUDNESS_DRC 13
PACTYP_BUFFERINFO 14
PACTYP_GLOBAL_CRC16 15
PACTYP_GLOBAL_CRC32 16
PACTYP_AUDIOTRUNCATION 17
PACTYP_GENDATA 18
PACTYP_EARCON 19
PACTYP_PCMCONFIG 20
PACTYP_PCMDATA 21
PACTYP_LOUDNESS 22
/* reserved for ISO/IEC 23090-4 use */ 23 – 31
PACTYP_AUTH_START 32
PACTYP_AUTH_SIG 33
PACTYP_UUID 34
PACTYP_TIMESTAMP 35
PACTYP_AUTH_TAG 36
PACTYP_AUTH_ SEQUENCE_AU_COUNTER 37
/* reserved for ISO use */ 38-127
/* reserved for use outside of ISO scope */ 128-261
/* reserved for ISO use */ 262-389
/* reserved for use outside of ISO scope */ 390-517
Application-specific MHASPacketType values are mandated to be in the space reserved for use outside
of ISO scope. These shall be skipped by a decoder as a minimum of structure is required by the decoder
to skip these extensions.
After 14.4.19, add the following:

14.4.20  PACTYP_AUTH_START
The MHASPacketType PACTYP_AUTH_START may be used to embed information for media authentication
into the bitstream.
For this packet type, MHASPacketLabel has the same value as the related packets to which this authentication
information refers to.
14.4.21  PACTYP_AUTH_SIG
© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
The MHASPacketType PACTYP_AUTH_SIG may be used to embed information for media authentication into
the bitstream.
For this packet type, MHASPacketLabel has the same value as the related packets to which this authentication
information refers to.
14.4.22  PACTYP_AUTH_UUID
The MHASPacketType PACTYP_UUID may be used to embed UUID information into the bitstream, for
instance in support of media authenticity.

For this packet type, MHASPacketLabel has the same value as the related packets to which this UUID refers
to.
14.4.23  PACTYP_TIMESTAMP
The MHASPacketType PACTYP_TIMESTAMP may be used to embed timestamp information into the
bitstream, for instance in support of media authenticity.

For this packet type, MHASPacketLabel has the same value as the related packets to which this timestamp
information refers to.
14.4.24  PACTYP_AUTH_TAG
The MHASPacketType PACTYP_AUTH_TAG may be used to embed information for media authenticity
associating (tagging) MHAS packets of MHASPacketType PACTYP_MPEGH3DAFRAME with one or more
resilience levels. If packets of MHASPacketType PACTYP_AUTH_TAG are present, they are expected to
precede their associated packet of MHASPacketType PACTYP_MPEGH3DAFRAME.
For this packet type, MHASPacketLabel has the same value as the associated packets of MHASPacketType
PACTYP_MPEGH3DAFRAME.
14.4.25  PACTYP_AUTH_SEQUENCE_AU_COUNTER
The MHASPacketType PACTYP_AUTH_SEQUENCE_AU_COUNTER may be used to embed information for
media authenticity associating MHAS packets of MHASPacketType PACTYP_MPEGH3DAFRAME with a
counter value. If packets of MHASPacketType PACTYP_AUTH_SEQUENCE_AU_COUNTER are present, they
are expected to precede their associated packet of MHASPacketType PACTYP_MPEGH3DAFRAME.
For this packet type, MHASPacketLabel has the same value as the associated packets of MHASPacketType
PACTYP_MPEGH3DAFRAME.
14.4.19, Table 229
Replace Table 229 with the following:

© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Value of MHASPacketLabel
MHASPacketType Value
0x01 – 0x10 0x11 and larger
(main stream) (sub-streams)
PACTYP_FILLDATA 0 required not allowed not allowed
PACTYP_MPEGH3DACFG 1 not allowed no restriction no restriction
PACTYP_MPEGH3DAFRAME 2 not allowed no restriction no restriction
PACTYP_AUDIOSCENEINFO 3 not allowed no restriction no restriction
/* reserved for ISO use */ 4-5 — — —
PACTYP_SYNC 6 required not allowed not allowed
PACTYP_SYNCGAP 7 required not allowed not allowed
PACTYP_MARKER 8 no restriction no restriction no restriction
PACTYP_CRC16 9 shall be identical to MHASPacketLabel of MHAS packet
immediately following the present MHAS packet
PACTYP_CRC32 10
PACTYP_DESCRIPTOR 11 required not allowed not allowed
PACTYP_USERINTERACTION 12 not allowed required not allowed
PACTYP_LOUDNESS_DRC 13 not allowed required not allowed
PACTYP_BUFFERINFO 14 no restriction no restriction no restriction
PACTYP_GLOBAL_CRC16 15 required not allowed not allowed
PACTYP_GLOBAL_CRC32 16 required not allowed not allowed
PACTYP_AUDIOTRUNCATION 17 not allowed no restriction no restriction
PACTYP_GENDATA 18 no restriction no restriction no restriction
PACTYP_ EARCON 19 shall be identical to MHASPacketLabel of MHAS packets
containing the audio addressed by the earcon
PACTYP_ PCMCONFIG 20 not allowed not allowed > 2048
PACTYP_ PCMDATA 21 not allowed not allowed > 2048
PACTYP_ LOUDNESS 22 not allowed no restriction no restriction
/* reserved for ISO/IEC 23090-4 use */ 23 – 31 — — —
PACTYP_ AUTH_START 32 no restriction no restriction no restriction
PACTYP_ AUTH_SIG 33 no restriction no restriction no restriction
PACTYP_ UUID 34 no restriction no restriction no restriction
PACTYP_ TIMESTAMP 35 no restriction no restriction no restriction
PACTYP_AUTH_TAG 36 no restriction no restriction no restriction
PACTYP_AUTH_SEQUENCE_AU_COUNTER 37 no restriction no restriction no restriction
/* reserved for ISO use */ 38-127 — — —
/* reserved for use outside of ISO scope */ 128-261 — — —
/* reserved for ISO use */ 262-389 — — —
/* reserved for use outside of ISO scope */ 390-517 — — —
Key:
—: undefined
required: MHASPacketLabel shall have (one of) the value(s) listed in the title row of this column if packet is present
no restriction: MHASPacketLabel may have (one of) the value(s) listed in the title row of this column if packet is present
not allowed: MHASPacketLabel shall not have (any of) the value(s) listed in the title row of this column

For the base document ISO/IEC 23008-3:2026, before application of the present amendment, in sequential order,
Renumber Tables 233 to 284 in ISO/IEC 23008-3:2026 as Tables 245 to 296

© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Renumber Tables 285 to 333 in ISO/IEC 23008-3:2026 as Tables 298 to 346

14.8
After 14.7, add:
14.8  Media Authenticity
Media authenticity is optional. If supported, the corresponding data is encapsulated in multiple MHAS
packets as part of an MHAS audio data stream.
MPEG-H 3D audio decoders used in applications which do not require media authentication and MPEG-H 3D
audio decoders which do not support media authentication as described in the current section shall ignore
the media authenticity MHAS packets. The process of media authentication and verification is out of scope
for the MPEG-H 3D audio decoders.
The media authenticity data is encapsulated in multiple MHAS Packets as part of an MHAS audio data stream.
14.8.1  Syntax
For the MHAS packet with MHASPacketType of PACTYP_AUTH_START, mpegh3daAuthStart() is defined as
shown in Table 233.
For the MHAS packet with MHASPacketType of PACTYP_AUTH_SIG, mpegh3daAuthSig() is defined as shown
in Table 234.
For the MHAS packet with MHASPacketType of PACTYP_UUID, authUUID() is defined as shown in Table 235.
For the MHAS packet with MHASPacketType of PACTYP_TIMESTAMP, authTimestamp() is defined as shown
in Table 236.
For the MHAS packet with MHASPacketType of PACTYP_AUTH_TAG, mpegh3daAuthResilienceTag() is
defined as shown in Table 237.
For the MHAS packet with MHASPacketType of PACTYP_AUTH_SEQUENCE_AU_COUNTER,
mpegh3daAuthSequenceAUCounter() is defined as shown in Table 238.
Table 233 — Syntax of mpegh3daAuthStart
Syntax No. of bits Mnemonic
mpegh3daAuthStart()
{
authID 8 uimsbf
authSequence 1 uimsbf
authHashType = escapedValue(4,8,8); 4, 12, 20 uimsbf
authKeyID = escapedValue(3,8,8); 3, 11, 19 uimsbf
authProvID = escapedValue(8,8,16); 8, 16, 32 uimsbf
if (authProvID == 0x00) {
authSourceURILengthMinus1 = escapedValue(8,8,8); 8, 16, 24 uimsbf
for (i=0; i<= authSourceURILengthMinus1; i++) {
authSourceURI[i] 8 bslbf
}
}
authResilienceLevelMax 4 uimsbf

© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
TTaabbllee 233 233 ((ccoonnttiinnueuedd))
Syntax No. of bits Mnemonic
hasAuthSequenceAUCounter 1 uimsbf
isFirstSequence 1 uimsbf
isAuthCRC 1 uimsbf
authFrameTypes 1 uimsbf
if (authFrameTypes){
authPactypInclusion 1 uimsbf
authPactypListLengthMinus1 6 uimsbf
for (i=0; i <= authPactypListLengthMinus1; i++) {
authPacketType[i] = escapedValue(8,8,8); 8, 16, 24 uimsbf
}
}
authMultiStreams 1 uimsbf
if (authMultiStreams) {
authMSInclusion 1 uimsbf
authMSLabelsListLengthMinus1 6 uimsbf
for(i=0; i <= authMSLabelsListLengthMinus1; i++) {
authPacketLabel[i] 8, 16, 48 uimsbf
= escapedValue(8,8,32);
}
}
}
Table 234 — Syntax of mpegh3daAuthSig
Syntax No. of bits Mnemonic
mpegh3daAuthSig()
{
authID 8 uimsbf
authSequence 1 uimsbf
authPartialSig 1 uimsbf
authABREnable 2 uimsbf
numSig = 1;
if (authABREnable) {
authABRBitrateAtMinMax 2 uimsbf

if (authABREnable==1) {
if(authABRBitrateAtMinMax==1) {
numSig = 2;
} else {
numSig = 3;
}
© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
TTabablele 2 23344 ((ccoonnttiinnueuedd))
Syntax No. of bits Mnemonic
}
if (authABREnable==2) {
if(authABRBitrateAtMinMax==1) {
numSig = 3;
} else if(authABRBitrateAtMinMax==2) {
numSig = 4;
} else {
numSig = 5;
}
}
}
for (m=0; m<=authResilienceLevelMax; m++) {
for (n=0; n if (authPartialSig){
sigSegmentStart 1 uimsbf
sigSegmentStop 1 uimsbf
sigSegmentLengthMinus1 4 uimsbf
sigPartial (sigSegmentLengthMinus1+1)*8 uimsbf
} else {
sigLengthMinus1 6 uimsbf
sigComplete (sigLengthMinus1+1)*8 uimsbf
}
}
}
}
Table 235 — Syntax of authUUID
Syntax No. of bits Mnemonic
authUUID()
{
uuidSegmentStart 1 uimsbf
uuidSegmentStop 1 uimsbf
uuidSegmentLengthMinus1 4 uimsbf
uuid (uuidSegmentLengthMinus1+1)*8 uimsbf
}
© ISO/IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAM 1:2026(en)
Table 236 — Syntax of authTimestamp
Syntax No. of bits Mnemonic
authTimestamp()
{
authID 8 uimsbf
authTimeType 7 uimsbf
authTimeOffsetType 1 uimsbf
switch (authTimeType ) {
case authTimeLong:
authTime = escapedValue(12,16,32); 12, 28, 60 uimsbf
authTimeOffset 12 uimsbf
break;
case authTimeShort:
authTimeS = escapedValue(4,8,8); 4, 12, 20 uimsbf
authTimeOffsetS = escapedValue(4,8,8); 4, 12, 20 uimsbf
break;
case authTimeTAI: { /* acc. ISO/IEC 23001-17 */
TAI_timestamp; 64 uimsbf
status_bits; 8 uimsbf
break;
default:
break;
}
}
Table 237 — Syntax of mpegh3daAuthResilienceTag
Syntax No. of bits Mnemonic
mpegh3daAuthResilienceTag()
{
authID 8 uimsbf
numLevels 4 uimsbf
for(i=0; i authResilienceLevel 4 uimsbf
}
}
Table 238 — Syntax of mpegh3daAuthSequenceAUCounter
Syntax No. of bits Mnemonic
mpegh3daAuthSequenceAUCounter()
{
authID 8 uimsbf
authSequenceAUCounter escapedValue(8,16,16) uimsbf
}
© ISO/IEC 2026 – All rights re
...

ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
ISO/IEC JTC1JTC 1/SC 29/WG 6
Secretariat: JISC
Date: 2026-06-1907-09
Information technology — High efficiency coding and media delivery
in heterogeneous environments —
Part 3:
3D audio
Amendment
AMENDMENT 1: Media authenticity
FDIS stage
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)
© ISO/IEC 2026
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-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO #### /IEC 2026 – All rights reserved
ii
ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
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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.
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.
© ISO/IEC 2026 – All rights reserved
iii
ISO/IEC 23008-3:XXXX/DAM 1:2026(en)
Information technology — High efficiency coding and media delivery
in heterogeneous environments —
Part 3:
3D audio
Amendment
AMENDMENT 1: Media authenticity

Add the following at the end of Section 2:
IETF RFC 3986, Uniform Resource Identifier (URI): Generic Syntax
IETF RFC 9562, Universally Unique IDentifiers (UUIDs)

14.2.1, Table 223
Replace Table 223 with the following:
Syntax No. of bits Mnemonic
MHASPacketPayload(MHASPacketType)
{
switch (MHASPacketType) {
case PACTYP_SYNC:
0xA5;                    /* syncword*/ 8 uimsbf
break;
case PACTYP_MPEGH3DACFG:
mpegh3daConfig();
break;
case PACTYP_MPEGH3DAFRAME:
mpegh3daFrame();
break;
case PACTYP_AUDIOSCENEINFO:
mae_AudioSceneInfo();
break;
case PACTYP_FILLDATA:
for (i=0; i< MHASPacketLength; i++) {
mhas_fill_data_byte(i); 8 bslbf
© ISO/IEC 2026 – All rights reserved
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)
Syntax No. of bits Mnemonic
}
break;
case PACTYP_SYNCGAP:
syncSpacingLength = escapedValue(16,24,24); 16,40,64 uimsbf
break;
case PACTYP_MARKER:
for (i=0; i< MHASPacketLength; i++) {
marker_byte(i); 8 bslbf
}
break;
case PACTYP_CRC16:
mhasParity16Data; 16 bslbf
break;
case PACTYP_CRC32:
mhasParity32Data; 32 bslbf
break;
case PACTYP_GLOBAL_CRC16:
global_CRC_type; 2 bslbf
numProtectedPackets; 6 bslbf
mhasParity16Data; 16 bslbf
break;
case PACTYP_ GLOBAL_CRC32:
global_CRC_type; 2 bslbf
numProtectedPackets; 6 bslbf
mhasParity32Data; 32 bslbf
break;
case PACTYP_DESCRIPTOR:
for (i=0; i< MHASPacketLength; i++) {
mhas_descriptor_data_byte(i); 8 bslbf
}
break;
case PACTYP_USERINTERACTION:
mpegh3daElementInteraction();
break;
case PACTYP_LOUDNESS_DRC:
mpegh3daLoudnessDrcInterface();
break;
2 © ISO #### /IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
Syntax No. of bits Mnemonic
case PACTYP_BUFFERINFO:
mhas_buffer_fullness_present 1 uimsbf
if (mhas_buffer_fullness_present)
mhas_buffer_fullness = escapedValue(15,24,32); 15,39,71 uimsbf
}
break;
case PACTYP_AUDIOTRUNCATION:
audioTruncationInfo();
break;
case PACTYP_GENDATA:
GenDataPayload();
break;
case PACTYP_EARCON:
earconInfo();
break;
case PACTYP_PCMCONFIG:
pcmDataConfig();
break;
case PACTYP_PCMDATA:
pcmDataPayload();
break;
case PACTYP_LOUDNESS:
mpegh3daLoudnessInfoSet();
break;
case PACTYP_AUTH_START:
mpegh3daAuthStart();
break;
case PACTYP_AUTH_SIG:
mpegh3daAuthSig();
break;
case PACTYP_UUID:
authUUID();
break;
case PACTYP_TIMESTAMP:
authTimestamp();
break;
case PACTYP_AUTH_TAG:
© ISO/IEC 2026 – All rights reserved
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)
Syntax No. of bits Mnemonic
mpegh3daAuthResilienceTag();
break;
case PACTYP_AUTH_SEQUENCE_AU_COUNTER:
mpegh3daAuthSequenceAUCounter();
break;
}
ByteAlign();
}
14.3.1, Table 226
Replace Table 226 with the following:
Table 1 — MHASPacketType    Table 2 — Value
PACTYP_FILLDATA 0
PACTYP_MPEGH3DACFG 1
PACTYP_MPEGH3DAFRAME 2
PACTYP_AUDIOSCENEINFO 3
/* reserved for ISO use */ 4-5
PACTYP_SYNC 6
PACTYP_SYNCGAP 7
PACTYP_MARKER 8
PACTYP_CRC16 9
PACTYP_CRC32 10
PACTYP_DESCRIPTOR 11
PACTYP_USERINTERACTION 12
PACTYP_LOUDNESS_DRC 13
PACTYP_BUFFERINFO 14
PACTYP_GLOBAL_CRC16 15
PACTYP_GLOBAL_CRC32 16
PACTYP_AUDIOTRUNCATION 17
PACTYP_GENDATA 18
PACTYP_EARCON 19
PACTYP_PCMCONFIG 20
PACTYP_PCMDATA 21
PACTYP_LOUDNESS 22
/* reserved for ISO/IEC 23090-4 use */ 23 – 31
4 © ISO #### /IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
Table 1 — MHASPacketType    Table 2 — Value
PACTYP_AUTH_START 32
PACTYP_AUTH_SIG 33
PACTYP_UUID 34
PACTYP_TIMESTAMP 35
PACTYP_AUTH_TAG 36
PACTYP_AUTH_ SEQUENCE_AU_COUNTER 37
/* reserved for ISO use */ 38-127
/* reserved for use outside of ISO scope */ 128-261
/* reserved for ISO use */ 262-389
/* reserved for use outside of ISO scope */ 390-517
Application-specific MHASPacketType values are mandated to be in the space reserved for use outside
of ISO scope. These shall be skipped by a decoder as a minimum of structure is required by the decoder
to skip these extensions.
After 14.4.19, add the following:

14.4.20  PACTYP_AUTH_START
The MHASPacketType PACTYP_AUTH_START may be used to embed information for media authentication
into the bitstream.
For this packet type, MHASPacketLabel has the same value as the related packets to which this authentication
information refers to.
14.4.21  PACTYP_AUTH_SIG
The MHASPacketType PACTYP_AUTH_SIG may be used to embed information for media authentication into
the bitstream.
For this packet type, MHASPacketLabel has the same value as the related packets to which this authentication
information refers to.
14.4.22  PACTYP_AUTH_UUID
The MHASPacketType PACTYP_UUID may be used to embed UUID information into the bitstream, for instance
in support of media authenticity.
© ISO/IEC 2026 – All rights reserved
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)

For this packet type, MHASPacketLabel has the same value as the related packets to which this UUID refers to.

14.4.23  PACTYP_TIMESTAMP
The MHASPacketType PACTYP_TIMESTAMP may be used to embed timestamp information into the bitstream,
for instance in support of media authenticity.

For this packet type, MHASPacketLabel has the same value as the related packets to which this timestamp
information refers to.
14.4.24  PACTYP_AUTH_TAG
The MHASPacketType PACTYP_AUTH_TAG may be used to embed information for media authenticity
associating (tagging) MHAS packets of MHASPacketType PACTYP_MPEGH3DAFRAME with one or more
resilience levels. If packets of MHASPacketType PACTYP_AUTH_TAG are present, they are expected to precede
their associated packet of MHASPacketType PACTYP_MPEGH3DAFRAME.
For this packet type, MHASPacketLabel has the same value as the associated packets of MHASPacketType
PACTYP_MPEGH3DAFRAME.
14.4.25  PACTYP_AUTH_SEQUENCE_AU_COUNTER
The MHASPacketType PACTYP_AUTH_SEQUENCE_AU_COUNTER may be used to embed information for
media authenticity associating MHAS packets of MHASPacketType PACTYP_MPEGH3DAFRAME with a
counter value. If packets of MHASPacketType PACTYP_AUTH_SEQUENCE_AU_COUNTER are present, they are
expected to precede their associated packet of MHASPacketType PACTYP_MPEGH3DAFRAME.
For this packet type, MHASPacketLabel has the same value as the associated packets of MHASPacketType
PACTYP_MPEGH3DAFRAME.
14.4.19, Table 229
Replace Table 229 with the following:
Value of MHASPacketLabel
MHASPacketType Value
0x01 – 0x10 0x11 and larger
(main stream) (sub-streams)
PACTYP_FILLDATA 0 required not allowed not allowed
PACTYP_MPEGH3DACFG 1 not allowed no restriction no restriction
PACTYP_MPEGH3DAFRAME 2 not allowed no restriction no restriction
PACTYP_AUDIOSCENEINFO 3 not allowed no restriction no restriction
6 © ISO #### /IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
Value of MHASPacketLabel
MHASPacketType Value
0x01 – 0x10 0x11 and larger
(main stream) (sub-streams)
/* reserved for ISO use */ 4-5 — — —
PACTYP_SYNC 6 required not allowed not allowed
PACTYP_SYNCGAP 7 required not allowed not allowed
PACTYP_MARKER 8 no restriction no restriction no restriction
PACTYP_CRC16 9 shall be identical to MHASPacketLabel of MHAS packet
immediately following the present MHAS packet
PACTYP_CRC32 10
PACTYP_DESCRIPTOR 11 required not allowed not allowed
PACTYP_USERINTERACTION 12 not allowed required not allowed
PACTYP_LOUDNESS_DRC 13 not allowed required not allowed
PACTYP_BUFFERINFO 14 no restriction no restriction no restriction
PACTYP_GLOBAL_CRC16 15 required not allowed not allowed
PACTYP_GLOBAL_CRC32 16 required not allowed not allowed
PACTYP_AUDIOTRUNCATION 17 not allowed no restriction no restriction
PACTYP_GENDATA 18 no restriction no restriction no restriction
PACTYP_ EARCON 19 shall be identical to MHASPacketLabel of MHAS packets
containing the audio addressed by the earcon
PACTYP_ PCMCONFIG 20 not allowed not allowed > 2048
PACTYP_ PCMDATA 21 not allowed not allowed > 2048
PACTYP_ LOUDNESS 22 not allowed no restriction no restriction
/* reserved for ISO/IEC 23090-4 use */ 23 – 31 — — —
PACTYP_ AUTH_START 32 no restriction no restriction no restriction
PACTYP_ AUTH_SIG 33 no restriction no restriction no restriction
PACTYP_ UUID 34 no restriction no restriction no restriction
PACTYP_ TIMESTAMP 35 no restriction no restriction no restriction
PACTYP_AUTH_TAG 36 no restriction no restriction no restriction
PACTYP_AUTH_SEQUENCE_AU_COUNTER 37 no restriction no restriction no restriction
/* reserved for ISO use */ 38-127 — — —
/* reserved for use outside of ISO scope */ 128-261 — — —
/* reserved for ISO use */ 262-389 — — —
/* reserved for use outside of ISO scope */ 390-517 — — —
Key:
—: undefined
required: MHASPacketLabel shall have (one of) the value(s) listed in the title row of this column if packet is present
no restriction: MHASPacketLabel may have (one of) the value(s) listed in the title row of this column if packet is present
not allowed: MHASPacketLabel shall not have (any of) the value(s) listed in the title row of this column

© ISO/IEC 2026 – All rights reserved
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)
For the base document ISO/IEC 23008-3:2026, before application of the present amendment, in sequential order,
Increment numbering of Table 285 to Table 333 by 13 (resulting in Table 298 to Table 346)
Increment numbering of TableRenumber Tables 233 to Table 284 by 12 (resulting in Tablein ISO/IEC 23008-
3:2026 as Tables 245 to Table 296)
Renumber Tables 285 to 333 in ISO/IEC 23008-3:2026 as Tables 298 to 346

14.8
After 14.7, add:
14.8  Media Authenticity
Media authenticity is optional. If supported, the corresponding data is encapsulated in multiple MHAS packets
as part of an MHAS audio data stream.
MPEG-H 3D audio decoders used in applications which do not require media authentication and MPEG-H 3D
audio decoders which do not support media authentication as described in the current section shall ignore the
media authenticity MHAS packets. The process of media authentication and verification is out of scope for the
MPEG-H 3D audio decoders.
The media authenticity data is encapsulated in multiple MHAS Packets as part of an MHAS audio data stream.
14.8.1  Syntax
For the MHAS packet with MHASPacketType of PACTYP_AUTH_START, mpegh3daAuthStart() is defined as
shown in Table 233.
For the MHAS packet with MHASPacketType of PACTYP_AUTH_SIG, mpegh3daAuthSig() is defined as shown
in Table 234.
For the MHAS packet with MHASPacketType of PACTYP_UUID, authUUID() is defined as shown in Table 235.
For the MHAS packet with MHASPacketType of PACTYP_TIMESTAMP, authTimestamp() is defined as shown
in Table 236.
For the MHAS packet with MHASPacketType of PACTYP_AUTH_TAG, mpegh3daAuthResilienceTag() is defined
as shown in Table 237.
For the MHAS packet with MHASPacketType of PACTYP_AUTH_SEQUENCE_AU_COUNTER,
mpegh3daAuthSequenceAUCounter() is defined as shown in Table 238.
Table 233 — Syntax of mpegh3daAuthStart
Syntax No. of bits Mnemoni
c
mpegh3daAuthStart()
{
authID 8 uimsbf
authSequence 1 uimsbf
8 © ISO #### /IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
Syntax No. of bits Mnemoni
c
authHashType = escapedValue(4,8,8); 4, 12, 20 uimsbf
authKeyID = escapedValue(3,8,8); 3, 11, 19 uimsbf
authProvID = escapedValue(8,8,16); 8, 16, 32 uimsbf
if (authProvID == 0x00) {
authSourceURILengthMinus1 = escapedValue(8,8,8); 8, 16, 24 uimsbf
for (i=0; i<= authSourceURILengthMinus1; i++) {
authSourceURI[i] 8 bslbf
}
}
authResilienceLevelMax 4 uimsbf
hasAuthSequenceAUCounter 1 uimsbf
isFirstSequence 1 uimsbf
isAuthCRC 1 uimsbf
authFrameTypes 1 uimsbf
if (authFrameTypes){
authPactypInclusion 1 uimsbf
authPactypListLengthMinus1 6 uimsbf
for (i=0; i <= authPactypListLengthMinus1; i++) {
authPacketType[i] = escapedValue(8,8,8); 8, 16, 24 uimsbf
}
}
authMultiStreams 1 uimsbf
if (authMultiStreams) {
authMSInclusion 1 uimsbf
authMSLabelsListLengthMinus1 6 uimsbf
for(i=0; i <= authMSLabelsListLengthMinus1; i++) {
authPacketLabel[i] 8, 16, 48 uimsbf
= escapedValue(8,8,32);
}
}
}
© ISO/IEC 2026 – All rights reserved
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)
Table 234 — Syntax of mpegh3daAuthSig
Syntax No. of bits Mnemonic
mpegh3daAuthSig()
{
authID 8 uimsbf
authSequence 1 uimsbf
authPartialSig 1 uimsbf
authABREnable 2 uimsbf
numSig = 1;
if (authABREnable) {
authABRBitrateAtMinMax 2 uimsbf

if (authABREnable==1) {
if(authABRBitrateAtMinMax==1) {
numSig = 2;
} else {
numSig = 3;
}
}
if (authABREnable==2) {
if(authABRBitrateAtMinMax==1) {
numSig = 3;
} else if(authABRBitrateAtMinMax==2) {
numSig = 4;
} else {
numSig = 5;
}
}
}
for (m=0; m<=authResilienceLevelMax; m++) {
for (n=0; n if (authPartialSig){
sigSegmentStart 1 uimsbf
sigSegmentStop 1 uimsbf
sigSegmentLengthMinus1 4 uimsbf
sigPartial (sigSegmentLengthMinus1+1)*8 uimsbf
} else {
10 © ISO #### /IEC 2026 – All rights reserved
ISO/IEC 23008-3:2026/FDAMFDAmd 1:2026(en)
Syntax No. of bits Mnemonic
sigLengthMinus1 6 uimsbf
sigComplete (sigLengthMinus1+1)*8 uimsbf
}
}
}
}
Table 235 — Syntax of authUUID
Syntax No. of bits Mnemonic
authUUID()
{
uuidSegmentStart 1 uimsbf
uuidSegmentStop 1 uimsbf
uuidSegmentLengthMinus1 4 uimsbf
uuid (uuidSegmentLengthMinus1+1)*8 uimsbf
}
Table 236 — Syntax of authTimestamp
Syntax No. of bits Mnemonic
authTimestamp()
{
authID 8 uimsbf
authTimeType 7 uimsbf
authTimeOffsetType 1 uimsbf
switch (authTimeType ) {
case authTimeLong:
authTime = escapedValue(12,16,32); 12, 28, 60 uimsbf
authTimeOffset 12 uimsbf
break;
case authTimeShort:
authTimeS = escapedValue(4,8,8); 4, 12, 20 uimsbf
authTimeOffsetS = escapedValue(4,8,8); 4, 12, 20 uimsbf
break;
case authTimeTAI: { /* acc. ISO/IEC 23001-17 */
© ISO/IEC 2026 – All rights reserved
ISO #####-#:####(X/IEC 23008-3:2026/FDAmd 1(en)
Syntax No. of bits Mnemonic
TAI_timestamp; 64 uimsbf
status_bits; 8 uimsbf
break;
default:
break;
}
}
Table 237 — Syntax of mpegh3daAuthResilienceTag
Syntax No. of bits Mnemonic
mpegh3daAuthResilienceTag()
{
authID 8 uimsbf
numLevels 4 uimsbf
for(i=0; i authResilienceLevel 4 uimsbf
}
}
Table 238 — Syntax of mpegh3daAuthSequenceAUCounter
Syntax No. of bits Mnemonic
mpegh3daAuthSequenceAUCounter()
{
authID 8 uimsbf
authSequenceAUCounter escapedValue(8,16,16) uimsbf
}
14.8.2  Semantics
authID Shall be used to identify the combination of authHashType, authProvID
and authKeyID to which the related authenticity information belongs to.
This may be used to enable authenticity of one authentication sequence
with different authentication configurations.
authSequence Indi
...