1、 ISO/IEC 2012. CSA Group 2014. All rights reserved. Unauthorized reproduction is strictly prohibited.Amendment3:2014(IDT) toCAN/CSA-ISO/IEC 14496-3-10(ISO/IEC 14496-3:2009, IDT)National Standard of CanadaInformationtechnology Coding of audio-visualobjects Part 3:AudioAMENDMENT 3: Transport of unifie
2、dspeech and audio coding(USAC)Standards UpdateServiceAmendment 3:2014 (IDT) toCAN/CSA-ISO/IEC-14496-3-10March 2014Title: Information technology Coding of audio-visual objects Part 3: AudioAMENDMENT 3: Transport of unified speech and audio coding (USAC)To register for e-mail notification about any up
3、dates to this publication go to shop.csa.ca click on CSA Update ServiceThe List ID that you will need to register for updates to this publication is 2422934.If you require assistance, please e-mail techsupportcsagroup.org or call 416-747-2233.Visit CSA Groups policy on privacy at csagroup.org/legalt
4、o find out how we protect your personalinformation.Information technology Coding of audio-visual objects Part 3: AudioAMENDMENT 3: Transport of unified speech and audio coding (USAC)Technologies de linformation Codage des objets audiovisuels Partie 3: Codage audioAMENDEMENT 3: Transport de discours
5、unifi et codage audio (USAC)INTERNATIONAL STANDARDISO/IEC14496-3Fourth edition2009-09-01Reference numberISO/IEC 14496-3:2009/Amd.3:2012(E)AMENDMENT 32012-08-01 ISO/IEC 2012ISO/IEC 14496-3:2009/Amd.3:2012(E)ii ISO/IEC 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO/IEC 2012All rights reserve
6、d. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester
7、.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgAmendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 ISO/IEC 14496-3:2009/Amd.3:2012(E)ForewordISO (the International Organization for Standardization) and IEC (the Intern
8、ational 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 fie
9、lds 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
10、joint technical committee, ISO/IEC JTC 1.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committ
11、ee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall n
12、ot be held responsible for identifying any or all such patent rights.Amendment 3 to ISO/IEC 14496-3:2009 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. ISO/IEC 2012 All rights reser
13、ved iiiAmendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 Amendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 Information technology Coding of audio-visual objects Part 3: AudioAMENDMENT 3: Transport of unified speech and audio coding (USAC)1.2 Normative referencesAdd the following reference:ISO/IEC 23003-3,
14、 Information technology MPEG audio technologies Part 3: Unified speech and audio coding1.3 Terms and definitionsInsert the following term at the appropriate place and align numbering:x.y.z. USAC: Unified Speech and Audio Coding.1.5.1.1, Table 1.1Add a new row for USAC audio object type:Object Type I
15、DAudio Object Typegain control BPGC/CBAC/LEMC Remark0 Null 41 SMR Main 42 USAC 43 SAOC 44 LD MPEG Surround 45 - 95 (reserved) 1.5.1.2Add the following subclause describing the USAC audio object type:1.5.1.2.40 USAC object typeThe USAC object type conveys Unified Speech and Audio Coding payload (see
16、ISO/IEC 23003-3) in the MPEG-4 Audio framework.ISO/IEC 14496-3:2009/Amd.3:2012(E) ISO/IEC 2012 All rights reserved 1Amendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 ISO/IEC 14496-3:2009/Amd.3:2012(E)1.5.2.1Add the following list item:15. The Low Delay AAC v2 Profile contains the audio object types 23
17、(ER AAC LD), 39 (ER AAC ELD) and 44 (LD MPEG Surround).Table 1.3, Audio Profiles definitionAdd a column with the term “Low Delay AAC v2 Profile” in the first (header) row, and an “X” in the rows with the Object Type IDs 23, 39 and 44, as follows:Object Type ID Audio Object Type Low DelayAAC v2 Profi
18、le 23 ER AAC LD X 39 ER AAC ELD X 44 LD MPEG Surround X1.5.2.3 Levels within the profilesAdd the following paragraph:Levels for Low Delay AAC v2 ProfileThe following levels are specified:Table AMD3.1 Lev els for the Low Delay AAC v2 profileLevelAOT of Core CoderMax. number output channelsMax. sampli
19、ng ratekHz 1MPEG SurroundMax. PCU1 ER AAC (E)LD 41.0 48 n/a 52 ER AAC (E)LD 42.0 48 LD MPEG Surround 2-1-2 11.53 ER AAC (E)LD 45.1 48 LD MPEG Surround 2-1-2 30 24 ER AAC (E)LD 45.1 48 LD MPEG Surround 5-x-5 330 21: It is mandatory to operate the SBR tool in downsampled mode if the sampling rate of t
20、he AAC core is higher than 24kHz.2: Complexity of discrete 5.1 ER AAC ELD without LD MPS. (Complexity of ER AAC ELD core with LD MPS is lower than discrete 5.1 ER AAC ELD).3: with 1 x 2.4: epconfig = 0.Only applicable for ER AAC LD: LTP is not permitted. Pulse data is not permitted.2 ISO/IEC 2012 Al
21、l rights reservedAmendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 ISO/IEC 14496-3:2009/Amd.3:2012(E)1.5.2.4 audioProfileLevelIndicationInsert the following new entries into Table 1.14 “audioProfileLevelIndication values” and adapt the “reserved for ISO use” range accordingly:Value Profile Level. 0x44
22、Baseline USAC Profile L10x45 Baseline USAC Profile L20x46 Baseline USAC Profile L30x47 Baseline USAC Profile L40x48 Extended HE AAC Profile L10x49 Extended HE AAC Profile L20x4A Extended HE AAC Profile L30x4B Extended HE AAC Profile L40x4C Low Delay AAC v2 Profile L10x4D Low Delay AAC v2 Profile L20
23、x4E Low Delay AAC v2 Profile L30x4F Low Delay AAC v2 Profile L40x50 - 0x7F reserved for ISO use -. 1.6.2.1 AudioSpecificConfigAmend Table 1.15 as follows:Table 1.15 Syn tax of AudioSpecificConfig() ISO/IEC 2012 All rights reserved 3Amendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 ISO/IEC 14496-3:2009/
24、Amd.3:2012(E)Syntax No. of bits Mnemonic AudioSpecificConfig () audioObjectType = GetAudioObjectType(); switch (audioObjectType) case 41: SymbolicMusicSpecificConfig(); break; case 42: NOTE UsacConfig(); break; case 43: saocPresentFlag = 1; saocPayloadEmbedding; 1 uimsbf SaocSpecificConfig(); break;
25、 NOTE: In the Baseline USAC profile defined in ISO/IEC 23003-3 4.5.2, the backwards compatible signaling of SBR, PS, MPS, or SAOC at the end of the AudioSpecificConfig() (i.e., using the extensionIdentifier bitstream element) is not permitted. Add the following subclause after 1.6.2.1.19:1.6.2.1.20
26、UsacConfigDefined in ISO/IEC 23003-3, Clause 5.1.6.2.2.1Amend Table 1.17 “Audio Object Types” as follows:Object Type IDAudio Object Typedefinition of elementary stream payloads and detailed syntaxMapping of audio payloads to access units and elementary streams0 NULL 41 SMR Main ISO/IEC 14496-2342 US
27、AC ISO/IEC 23003-3 see 1.6.2.2.2.543 SAOC ISO/IEC 23003-2 44 LD MPEG SurroundISO/IEC 23003-2 Add the following subclause after 1.6.2.2.2.4:1.6.2.2.2.5 USACOne top level payload (UsacFrame() is mapped into one access unit. A sequence of access units forms one elementary stream.4 ISO/IEC 2012 All righ
28、ts reservedAmendment 3:2014 to CAN/CSA-ISO/IEC 14496-3-10 ISO/IEC 14496-3:2009/Amd.3:2012(E) ISO/IEC 2012 All rights reservedICS 35.040Copyright NoticeThe Canadian adopg415 on of this Amendment to the Internag415 onal Standard contains informag415 on copyright protected by CSA Group. All rights rese
29、rved. No part of this adopted Amendment may be reproduced in any form whatsoever without the prior permission of CSA Group. ISO/IEC material is reprinted with permission.Requests for permission to reproduce this adopted Amendment or parts thereof should be addressed to:Manager, SalesCSA Group5060 Spectrum Way, Suite 100Mississauga, Ontario L4W 5N6Copyright violators will be prosecuted to the full extent of the law.
