ISO/IEC INTERNATIONAL STANDARD 23003-2 Second edition 2018-12 Information technology MPEG audio technologies Part 2: Spatial Audio Object Coding (SAOC) Technologies de I'information-Technologies audioMPEG- Partie2: Codage d'objetaudio spatial (SAOC) Reference number IS0/IEC 23003-2:2018(E) IEC ISO @IS0/IEC2018 IS0/IEC23003-2:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2018 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 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 01 11 Fax: +41 22 749 09 47 Email:[email protected] Website: www.iso.org Published in Switzerland ii IS0/IEC2018-Allrightsreserved IS0/IEC23003-2:2018(E) Contents Page Foreword. Introduction. 1 Scope.. 2 Normative references.... 3 Terms and definitions... 4 Notations and abbreviated terms 4.1 Notation. 4.2 Operations.... 4.3 Constants...... 4.4 Variables. 4.5 Abbreviated terms.... 5 SAOC overview... 5.1 5.2 BasicstructureoftheSAoCtranscoder/decoder 5.3 Tools and functionality. 10 5.4 Delay and synchronization. 11 5.5 SAOCProfilesandlevels 17 Syntax. .20 6 6.1 Payloads for SAOC. 20 6.2 Definition ... 7 7.1 Compressed data stream decoding and dequantization of SAoC data. 43 7.2 Compressed data stream encoding and quantization of MPs data... ..46 7.3 Time/frequency transforms.. 7.4 Signals and parameters ... 7.5 SAoCtranscoding/decodingmodesforbaselineand LDprofiles 51 7.6 EAoprocessingforbaselineandLDprofiles... ..64 7.7 SAOC-DE profile decoding modes.. 7.8 DcUprocessing... 75 7.9 Modification range control for SAoC-DE processing modes 79 7.10 MBOprocessing 7.11 MCU Combiner... 81 7.12 ..83 7.13 Low power SAoC processing.. ..86 7.14 Low delay SAOC processing... .87 8 Transport of SAoC side information.. 8.1 ..89 8.2 Transport and signalling in an MPEG environment.. 8.3 Transport of SAoC data overPCM channels.... .93 9 Transport of predefined rendering information ... .94 9.1 9.2 Rendering information description file format... 10 Conformance testing. 10.1 General.... 96 10.2 Terms and definitions 10.3 SAoC conformance testing.. Bitstreams. .96 10.4 @ IS0/IEC 2018 - All rights reserved ii