ISO IEC 23008-3 AMD 4-2016 Information technology - High efficiency coding and media delivery in heterogeneous environments - Part 3 3D audio - Amendment 4 Carr.pdf
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1、Information technology High efficiency coding and media delivery in heterogeneous environments Part 3: 3D audio AMENDMENT 4: Carriage of system data Technologies de linformation Codage haute efficacit et livraison des medias dans des environnements htrognes Partie 3: Audio 3D AMENDEMENT 4: Transport
2、 de donnes systme INTERNATIONAL STANDARD ISO/IEC 23008-3 First edition 2015-10-15 Reference number ISO/IEC 23008-3:2015/Amd.4:2016(E) AMENDMENT 4 2016-11-01 ISO/IEC 2016 ii ISO/IEC 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2016, Published in Switzerland All rights reserved. Unles
3、s 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 ad
4、dress below or ISOs member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.org ISO/IEC 23008-3:2015/Amd.4:2016(E) ISO/IEC 23008-3:2015/Amd.4:2016(E) Foreword
5、 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 comm
6、ittees 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
7、work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. 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 cri
8、teria 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). Attention is drawn to the possibility that some of the elements of this document may be the subject of pa
9、tent rights. ISO and IEC 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 www.iso.org/patents). Any trade
10、 name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization
11、 (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL www.iso.org/iso/foreword.html. The committee responsible for this document is ISO/IEC JTC 1, Information technology, SC 29, Coding of audio, picture, multimedia and hypermedia information. ISO/IEC 2016 All rights reserv
12、ed iii Information technology High efficiency coding and media delivery in heterogeneous environments Part 3: 3D audio AMENDMENT 4: Carriage of system data Clause 18 Add the following: 18.6 Carriage of system metadata for the interaction with system engine The system data is encapsulated in an MHAS
13、Packet as part of an MHAS audio data stream. 18.6.1 Syntax For the MHAS Packet with MHASPacketType of PACTYP _SYSMETA, SysMetaPayload is defined as shown in Table AMD.1. If a packet with MHASPacketType of PACTYP _SYSMETA is present in the MPEG-H 3D Audio MHAS stream, MHAS Packets of type PACTYP_MPEG
14、H3DAFRAME shall also be present in the stream. The total bitrate associated with all packets of type PACTYP _SYSMETA shall not be greater than 1 % of the audio bitrate, averaged over a 5 s time window. For example, if the nominal audio bitrate is 512 kb/s and one PACTYP _SYSMETA MHAS Packet of lengt
15、h 256 bytes is transmitted each second, the bitrate associated with these packets is 0.4 % of the audio bitrate. Table AMD.1 Syntax of SysMetaPayload Syntax No. of bits Mnemonic SysMetaPayload () sysType 8 uimsbfif (sysType=0) t35Code; 1640 uimsbfelse if (sysType=0xFF) uuid; 128 uimsbfshortUuid; 8 u
16、imsbfsysData; var*8 uimsbf 18.6.2 Semantics sysType This element indicates corresponding reference of the system data as shown in Table AMD.2. This field takes either a dynamically assigned value (see below under shortUUID) or one of two reserved values. ISO/IEC 23008-3:2015/Amd.4:2016(E) ISO 2016 A
17、ll rights reserved 1 ISO/IEC 23008-3:2015/Amd.4:2016(E) Table AMD.2 Value of sysType Value Corresponding References 0 ITU T.35 ID follows 1-254 sysType is UUID short form (no additional ID follows). See uuid and shortUuid field semantics below. 255 Full UUID and its short form follow t35Code For sys
18、Type value 0, this field shall be the “country code” field (1 or 2 bytes) followed by the “manufacturer code” field (1 or more bytes) as defined by ITU T.35 2. The length is variable, but cannot be less than 2 bytes. uuid A binary encoding of UUID as defined in IETF RFC 4122 1 . shortUuid For sysTyp
19、e values 1-254, the sysType value is the short form value of the UUID corresponding to the previous field, uuid. The long form identifier of the system type, uuid, is dynamically mapped to this short form identifier, shortUuid, and this short form identifier can occur later in the same stream to ref
20、er to the associ- ated UUID. This technique saves identifier overhead. The sysType value 255 both provides sysData associated with a UUID, and establishes a mapping between a shortUuid and the full uuid, such that the sysType field in subsequent packets may be equal to shortUuid to indicate that the
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