ISO/IEC 14496-4:2004/Amd 14:2007

INTERNATIONAL ISO/IEC
STANDARD 14496-4
Second edition
2004-12-15
AMENDMENT 14
2007-12-01


Information technology — Coding of
audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 14: BSAC conformance
Technologies de l'information — Codage des objets audiovisuels —
Partie 4: Essai de conformité
AMENDEMENT 14: Conformité BSAC




Reference number
ISO/IEC 14496-4:2004/Amd.14:2007(E)
©
ISO/IEC 2007

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ISO/IEC 14496-4:2004/Amd.14:2007(E)
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ISO/IEC 14496-4:2004/Amd.14:2007(E)
Foreword
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, 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 committee 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 not be held responsible for identifying any or all such patent rights.
Amendment 14 to ISO/IEC 14496-4:2004 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
information.
It specifies the conformance testing of BSAC multichannel and BSAC extensions as specified in
ISO/IEC 14496-3:2005/Amd.2:2006 and ISO/IEC 14496-3:2005/Amd.5:2007.

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ISO/IEC 14496-4:2004/Amd.14:2007(E)

Information technology — Coding of audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 14: BSAC conformance
In subclause 6.6.6 ER BSAC, replace:
However, only mono or 2-channel stereo objects are supported.

with:
The multichannel ER BSAC object is supported with BSAC channel extension payload.

In subclause 6.6.6.2.2 Test procedure, replace “Table 52” with “Table 52.A” (three occurrences).

At the end of subclause 6.6.6.2.2 Test procedure, add the following paragraph.
The conformance bitstreams corresponding to BSAC Extensions for the multichannel extension are the
‘er_bs09’ ~ ‘er_bs11’ as listed in Table 52.A. The conformance testing criterion for the multichannel extension
is same as ER BSAC.
The conformance bitstreams corresponding to BSAC Extensions for the SBR extension are listed in Table
52.B. The conformance testing criterion for the SBR extension is specified in subclause 6.6.17. The SBR
conformance test method of BSAC Extensions is different from that of HE-AAC in terms of parsing the SBR
payload. In figure AMD8-2, the ‘Read store/input’ module is to parse the SBR payload from BSAC Extensions
payload which can be realized by either decoding the whole BSAC Extensions payload or seeking the
‘sync_word’ in the extensions payload.
The ‘coreSetup’ of naming convention for BSAC Extensions is the ‘xx_sbr__’ where the ‘nchan’
represents the number of channel and the ‘fs’ is the sampling rate of SBR tool. By comparing the decoded
wave with the reference wave for the different ‘highestLayer’, the ‘HF overlap’ decoding module specified in
14496-3:2005 subclause 4.5.2.11.4 can be checked if it’s implemented correctly. The testing criterion with
‘Diffmax’ and ‘RMS max’ shall be applied only when the bitstream is decoded up to top layer.

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ISO/IEC 14496-4:2004/Amd.14:2007(E)
In subclause 6.6.6.2.3 Test sequences, change the table index from Table 52 to Table 52.A and extend Table
52.A with:
Table 52.A — ER BSAC Object Type Test Compressed data for Mobile Audio Internetworking
...