1、 Reference numberISO/IEC 14496-4:2004/Amd.8:2005(E)ISO/IEC 2005 International Organization for Standardization (ISO), 2005. All rights reserved. International Electrotechnical Commission (IEC), 2005. All rights reserved. NOT FOR RESALE. Information technology Coding of audio-visual objects Part 4: C
2、onformance testing AMENDMENT 8: High Efficiency Advanced Audio Coding, audio BIFS, and structured audio conformance Technologies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 8: Codage sonore avanc haute efficacit, BIFS sonore et conformit sonore structure Am
3、endment 8:2006 toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-4:06Amendment 8:2005 to International Standard ISO/IEC 14496-4:2004 has been adopted withoutmodification (IDT) as Amendment 8:2006 to CAN/CSA-ISO/IEC 14496-4:06. This Amendment was reviewedby the CSA Technical Committee on Information
4、 Technology (TCIT) under the jurisdiction of the StrategicSteering Committee on Information Technology and deemed acceptable for use in Canada.December 2006ISO/IEC 14496-4:2004/Amd.8:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this
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9、+ 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org ii ISO/IEC 2005 All rights reservedAmendment 8:2006 toCAN/CSA-ISO/IEC 14496-4:06Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 8: High Efficiency Advanced Audio Coding, audio BIFS, and structured a
10、udio conformance Technical Corrigendum 1:2009 (IDT) toAmendment 8:2006 (IDT) toNational Standard of CanadaCAN/CSA-ISO/IEC 14496-4-06(ISO/IEC 14496-4:2004, IDT)NOT FOR RESALE.PUBLICATION NON DESTINE LA REVENTE.CSA Standards Update ServiceTechnical Corrigendum 1:2009 toAmendment 8:2006 toCAN/CSA-ISO/I
11、EC 14496-4-06October 2009Title: Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 8: High Efficiency Advanced Audio Coding, audio BIFS, and structured audio conformancePagination: 2 pages (2 text)To register for e-mail notification about any updates to this
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13、acy at www.csagroup.org/legal to find out how we protect your personal information.ICS 35.040 Ref. No. ISO/IEC 14496-4:2004/Amd.8:2005/Cor.1:2008(E) ISO/IEC 2008 All rights reserved INTERNATIONAL STANDARD ISO/IEC 14496-4:2004/Amd.8:2005TECHNICAL CORRIGENDUM 1 Published 2008-06-15 INTERNATIONAL ORGAN
14、IZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATIONINTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALEInformation technology Coding of audio-visual objects Part 4: Conformance testing AMENDEMENT 8: High Efficiency Advanced Audio Coding, audio BIFS
15、, and structured audio conformance TECHNICAL CORRIGENDUM 1 Technologies de linformation Codage des objets audiovisuels Partie 4: Essai de conformit AMENDEMENT 8: Codage sonore avanc haute efficacit, BIFS sonore et conformit sonore structure RECTIFICATIF TECHNIQUE 1 Technical Corrigendum 1 to ISO/IEC
16、 14496-4:2004/Amd.8:2005 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. In the electronic attachment, replace the correspondingly named test sequences in SBR_CONFORMANCE_1 with thos
17、e provided (which have filenames suffixed “new”). ISO/IEC 14496-4:2004/Amd.8:2005/Cor.1:2008(E) 2 ISO/IEC 2008 All rights reservedPage 16, replace Table AMD8-3, SBR Test sequences, with the following table (where the changes are highlighted in grey): filebase name content bitrate (kbit/s) QMF Identi
18、fication QMFAccuracy Envelope Adjuster AccuracyGridcontrol testsHeader Change TestsInverse Filtering TestsAdditionalSinesTestsCRCDiff max RMSmax (linear value) test procedure al_sbr_twi none 24 y y - - - - y - - - - al_sbr_qmf Sine Sweep 24 - Y - - - - - - 5 1.4 maxDiff/RMS al_sbr_e rectangle * 10Hz
19、 sine 24/48 - - y - - - - y (Note 1)90 2.0 maxDiff/RMS al_sbr_gh rectangle * 10Hz sine 24/48 - - - y y - - - 51 1.5 maxDiff/RMS al_sbr_i (Note 2) rectangle + noise 24/48 - - - - - y - y (Note 1) 36 3.4 maxDiff/RMS al_sbr_s noise 24 - - - - - - y - 120 1.9 maxDiff/RMS al_sbr_cm (Note 2) music 24-128
20、- - - - - - - - - - - al_sbr_sig (Note 2) music 48 - - - - - - - - - - - al_sbr_sr music 24-56 - - - - - - - - - - - Note 1: CRC enabled for 32 kHz testvectors Note 2: The following bitstreams also exist with the suffix _new: al_sbr_i_32_1, al_sbr_i_44_1, al_sbr_i_48_1, al_sbr_cm_48_5.1, al_sbr_sig_
21、24_2_fsaac24_sig1. These are preferred for conformance testing while the ones without this suffix are deprecated. Technical Corrigendum 1:2009 toAmendment 8:2006 toCAN/CSA-ISO/IEC 14496-4-06Copyright NoticeThis Amendment to the International Standard contains information copyright protected by the I
22、nternational Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). Except as permitted under the laws of Canada, no extract of this Amendment to the International Standard may be reproduced, stored in any retrieval system, or transmitted in any form or by an
23、y means, electronic, photocopying, recording, or otherwise, without prior permission from the Standards Council of Canada (SCC). Requests for permission to reproduce this Amendment to the International Standard or parts thereof should be addressed to Manager, Technical Document Centre Standards Coun
24、cil of Canada 270 Albert Street, Suite 200 Ottawa, Ontario K1P 6N7 The Canadian adoption of this Amendment to the International Standard contains information copyright protected by the Canadian Standards Association. All rights reserved. No part of this adopted Amendment may be reproduced in any for
25、m whatsoever without the prior permission of the publisher. ISO/IEC material is reprinted with permission. Requests for permission to reproduce this adopted Amendment or parts thereof should be addressed to Manager, Sales Canadian Standards Association 5060 Spectrum Way, Suite 100 Mississauga, Ontar
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27、d, and was manufactured using biogas energy.ISO/IEC 14496-4:2004/Amd.8:2005(E) ISO/IEC 2005 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. Nati
28、onal 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
29、. 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, ISO/IEC JTC 1. International Standards are drafted in accordance with the
30、 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 committee are circulated to national bodies for voting. Publication as an International Standard requires
31、 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 not be held responsible for identifying any or all such patent rights. Amendment 8 to ISO/IEC 1449
32、6-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information. Amendment 8:2006 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.8:2005(E) iv ISO/IEC 2005 All rights reservedIntroducti
33、on This document specifies the eighth amendment to the ISO/IEC 14496-4:2004 standard. The amendment adds the conformance testing for the SBR audio object type defined in 14496-3. It also specifies conformance sequences for BIFS and Structured Audio. Amendment 8:2006 toCAN/CSA-ISO/IEC 14496-4:06ISO/I
34、EC 14496-4:2004/Amd.8:2005(E) ISO/IEC 2005 All rights reserved 1Information technology Coding of audio-visual objects Part 4: Conformance testing AMENDMENT 8: High Efficiency Advanced Audio Coding, audio BIFS, and structured audio conformance In subclause 6.5.1 File name conventions, insert the foll
35、owing row into Table 29 after the row for AAC LTP: Table 29 File name conventions SBR (+AAC LC) al_sbr_fsaac_sig al_sbr_fsaac_sig_ And add: indicates the SBR module mainly targeted by the test sequence. Possible values are “e“ for testing the envelope adjuster “s“ for testing sine addition, “gh“ for
36、 testing time-grid transitions in combination with changes of SBR header data, “i“ for testing inverse filtering, “qmf“ for testing the QMF implementation, “cm” for testing various channel modes, “sig” for testing SBR signaling, “twi“ for QMF identification, and “sr” for testing various combinations
37、 of sampling rates. corresponds to the number of channels present in the conformance test sequence. It is either a single integer, in which case it refers to the number of main audio channels, or two integers separated by a ., in which case the first integer equals the number of main audio channels,
38、 while the second number equals the number of low frequency enhancement channels. fsaac corresponds to the sampling rate of the underlying AAC-LC data. If it is omitted, it is half the sampling rate given as output sampling rate. is an integer describing the kind of signalling used according to the
39、table below. If this value is omitted, backwards compatible explicit signalling of SBR is used. Table 29A File name conventions sig Signalling method used 0 Implicit signalling of SBR 1 Hierarchical explicit signalling of SBR 2 Backwards compatible explicit signalling of SBR is either “hq“ or “lp“ f
40、or the high quality or the low power version of the SBR decoding algorithm respectively. Amendment 8:2006 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.8:2005(E) 2 ISO/IEC 2005 All rights reservedIn subclause 6.6.1.2.2 (Test procedure), replace: .testing can be done by comparing the output of
41、 a decoder under test with a reference output also supplied by ISO/IEC JTC 1/SC 29/WG 11. with: .testing can be done by comparing the output of a decoder under test with a reference output also supplied by ISO/IEC JTC 1/SC 29/WG 11. In cases where the decoder under test is followed by additional ope
42、rations (e.g. quantizing a signal to a 16 bit output signal) the conformance point is prior to such additional operations, i.e. it is permitted to use the actual decoder output (e.g. with more than 16 bit) for conformance testing. In subclause 6.6.3.1.2.3 (Bitstream payload), add: 6.6.3.1.2.3.2 aac_
43、scalable_main_header() max_sfb: Shall not be smaller than last_max_sfb (helper variable specified in ISO/IEC 14496-3). 6.6.3.1.2.3.3 aac_scalable_extension_header() max_sfb: Shall not be smaller than last_max_sfb (helper variable specified in ISO/IEC 14496-3). In subclause 6.6.4.1.2.1.1 AudioSpecifi
44、cConfig(), add: extensionAudioObjectType: Shall be the Audio Object Type SBR (AOT = 5). extensionSamplingFrequency: Shall be encoded with a value listed in Table 34, and the value shall be the same as samplingFrequency, or twice the value of samplingFrequency. extensionSamplingFrequencyIndex: Shall
45、be encoded with a value listed in Table 34, and the value shall indicate an extensionSamplingFrequency being the same as samplingFrequency as indicated by samplingFrequencyIndex, or the value shall indicate an extensionSamplingFrequency being twice the value of samplingFrequency. sbrPresentFlag: Sha
46、ll be encoded with the value zero if no SBR data is contained in the compressed MPEG-4 data. If SBR data is present in the compressed MPEG-4 data the parameter shall be encoded with the value one. In subclause 6.6.4.1.2.1.1 AudioSpecificConfig(), add the following entries to Table 34: Table 34 Speci
47、fication of samplingFrequencyIndex and samplingFrequency SamplingFrequencyIndex / SamplingFrequency Level 1 Level 2 Level 3 Level 4 Level 5 AAC Profile 0x60xc, 0xf / (k-1)while( (k) - (k-1) 1)(k) = (k) - 2elsewhile( (k-1) - (k) 1)(k) = (k) + 2xxyPkkkP ATAN IMAG H REAL HPPPPPPPPPPwhere ( )2ATAN is th
48、e arc tangent in four quadrants, and ( )REAL and ( )IMAG are operators to extract the real and the imaginary parts of the argument respectively. Perform linear curve fitting using least square error minimization as () ()11211yyxxyyxxkkkk kkkk kkKk RkSkPkTPk=( )()()2,yxyxf k ak b wherekkSRTSKaa and b
49、RKk k R=+= Identification of the terms of the complex exponent ( ) ( )jfk jakb=+ with ()0.5jkL + makes 2LaLb=Amendment 8:2006 toCAN/CSA-ISO/IEC 14496-4:06ISO/IEC 14496-4:2004/Amd.8:2005(E) 12 ISO/IEC 2005 All rights reserved Quantize in 1/L steps and in steps of one as ( )()NINT LLNINT= The synthesis QMF bank can subsequently be ide
