Information technology — MPEG audio technologies — Part 4: Dynamic Range Control — Amendment 2: Reference software

Technologies de l'information — Technologies audio MPEG — Partie 4: Contrôle de gamme dynamique — Amendement 2: Logiciel de référence

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STANDARD 23003-4
First edition
Information technology — MPEG
audio technologies —
Part 4:
Dynamic Range Control
AMENDMENT 2: Reference software
Technologies de l'information — Technologies audio MPEG —
Partie 4: Contrôle de gamme dynamique
AMENDEMENT 2: Logiciel de référence
Reference number
ISO/IEC 23003-4:2015/Amd.2:2017(E)
ISO/IEC 2017
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ISO/IEC 23003-4:2015/Amd.2:2017(E)
© ISO/IEC 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
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CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
ii © ISO/IEC 2017 – All rights reserved
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ISO/IEC 23003-4:2015/Amd.2:2017(E)

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. In the field of information technology, ISO and IEC have established a joint technical committee,


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 ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on 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 the following


This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, SC 29,

Coding of audio, picture, multimedia and hypermedia information.
A list of all parts in the ISO/IEC 23003 series can be found on the ISO website.
© ISO/IEC 2017 – All rights reserved iii
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ISO/IEC 23003-4:2015/Amd.2:2017(E)
Information technology — MPEG audio technologies —
Part 4:
Dynamic Range Control
AMENDMENT 2: Reference software
Clause 7
Add a new clause after Clause 7:
8 Reference software
8.1 Reference software structure
8.1.1 General

Clause 8 contains reference software for MPEG-D DRC which has been derived from reference models

used in the process of developing this document. The software is provided as an electronic attachment

to this document.

Reference software is normative in the sense that it correctly implements the MPEG-D DRC decoding

processes described in this document. Complying ISO/IEC 23003-4 implementations are not expected

to follow the algorithms or the programming techniques used by the reference software. Although the

decoding software is considered normative, it cannot add anything to the textual technical description

of MPEG-D DRC included in this document.

The software described in Clause 8 and in Annex H is divided into three categories:

a) Bitstream decoding software is catalogued in 8.2. This software accepts bitstreams encoded

according to the normative specification in this document and applies the bitstream content to

an input audio file. While this software appears in the normative part of this document, attention

is drawn to the fact that the implementation techniques used in this software are not considered

normative (

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