ISO/IEC 23003-2:2010/Amd 4:2016

INTERNATIONAL ISO/IEC
STANDARD 23003-2
First edition
2010-10-01
AMENDMENT 4
2016-11-01
Information technology — MPEG
audio technologies —
Part 2:
Spatial Audio Object Coding (SAOC)
AMENDMENT 4: SAOC Conformance
Technologies de l’information — Technologies audio MPEG —
Partie 2: Codage d’objet audio spatial (SAOC)
AMENDEMENT 4: Conformité SAOC
Reference number
ISO/IEC 23003-2:2010/Amd.4:2016(E)
©
ISO/IEC 2016
ISO/IEC 23003-2:2010/Amd.4:2016(E)

© ISO/IEC 2016, Published in Switzerland
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ii © ISO/IEC 2016 – All rights reserved

ISO/IEC 23003-2:2010/Amd.4:2016(E)

Foreword
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Commission) form the specialized system for worldwide standardization. National bodies that are
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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 criteria needed for
the different types of document should be noted. This document was drafted in accordance with the
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assessment, as well as information about ISO’s adherence to the 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 reserved iii

ISO/IEC 23003-2:2010/Amd.4:2016(E)
Information technology — MPEG audio technologies —
Part 2:
Spatial Audio Object Coding (SAOC)
AMENDMENT 4: SAOC Conformance
Add Clause 10, Conformance testing:
10  Conformance testing
10.1  Introduction
This clause specifies conformance criteria for both bitstreams and decoders compliant with the SAOC
standard as defined in Clauses 1 to 9 and Annexes A to G. This is done to assist implementers and to
ensure interoperability.
10.2   Terms and definitions
The terms and definitions as stated in Clause 3 apply. Furthermore, the following terms and definitions
will be used throughout this clause.
bitstream data encoded according to the SAOC standard
conformance test bitstream bitstream used for testing the conformance of an SAOC decoder.
10.3  SAOC conformance testing
5.5 defines the SAOC profiles and levels. Some conformance criteria apply to SAOC in general, while
others are specific to the specific SAOC profile and its levels. Conformance shall be tested for the level of
the profile with which a given bitstream or decoder/transcoder claims to comply.
10.4  Bitstreams
10.4.1  Characteristics
The SAOC audio object type (AOT) can be used in combination with various AOTs.
10.4.2  Test procedure
10.4.2.1  Introduction
An SAOC bitstream shall have the syntax and semantics as specified in Clauses 1 to 9 and Annexes A to G.
The present subclause defines the conformance criteria that shall be fulfilled by a compliant bitstream.
These criteria are specified for the syntactic elements of the bitstream and for some parameters
decoded from the SAOC bitstream payload.
ISO/IEC 23003-2:2010/Amd.4:2016(E)

10.4.2.2   Configuration header
10.4.2.2.1   SAOCSpecificConfig()/SAOCDESpecificConfig()
bsVersion For restrictions, see 10.4.2.5.
bsSamplingFrequencyIndex Shall be in the range 0x0.0xc or 0xf. For further restrictions, see
10.4.2.5.
bsSamplingFrequency For restrictions, see 10.4.2.5.
bsLowDelayMode For restrictions, see 10.4.2.5.
bsFreqRes Shall not be encoded with a value of 0.
bsFrameLength For restrictions, see 10.4.2.5.
bsNumObjects For restrictions, see 10.4.2.5.
bsNumFGOs For restrictions, see 10.4.2.5.
bsRelatedTo[i][j] No restrictions apply.
bsTransmitAbsNrg No restrictions apply.
bsNumDmxChannels For restrictions, see 10.4.2.5.
bsTttDualMode No restrictions apply.
bsTttBandsLow Shall not be encoded with a value larger than the value of
numBands as given by Table 33.
bsPdgFlag No restrictions apply.
bsOneIOC No restrictions apply.
bsDcuFlag For restrictions, see 10.4.2.5.
bsDcuMandatory No restrictions apply.
bsDcuDynamic No restrictions apply.
bsDcuMode No restrictions apply.
bsDcuParam No restrictions apply.
bsDeLimitFlag For restrictions, see 10.4.2.5
bsDeLimitFgo No restrictions apply.
bsDeLimitBgo No restrictions apply.
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ISO/IEC 23003-2:2010/Amd.4:2016(E)

10.4.2.2.2   SAOCExtensionConfigData()
bsSaocExtType No restrictions apply. Note that in case of values indicated as “N/A” in
Table 43, the parsing function SAOCExtensionConfigData(bsSaocExtType)
shall return the value 0, such that possibly present data is read as bsFillBits
(i.e. skipped) and correct parsing of the bitstream can continue.
bsSaocExtLen No restrictions apply.
bsSaocExtLenAdd No restrictions apply.
bsSaocExtLenAddAdd No restrictions apply.
bsFillBits No restrictions apply.
10.4.2.2.3   SAOCExtensionConfigData(0)
The syntactic element SAOCExtensionConfigData(0) shall not be present in case of Low Delay profile.
This syntactic element shall not be present in case of Baseline and Dialogue Enhancement profiles of
Level 1. Furthermore, this syntactic element shall not be present if the helper variable numSlots has
a value that is not listed in ISO/IEC 23003-1:2007, Table 55. Furthermore, if this syntactic element is
present, the bitstream shall fulfil the requirements outlined in ISO/IEC 23003-1:2007, 6.1.13. For
further restrictions, see 10.4.2.5.
bsDeLimitFgoEAO No restrictions apply.
bsDeLimitBgoEAO No restrictions apply.
bsDcuFlag2 No restrictions apply.
bsDcuMode2 No restrictions apply.
bsDcuParam2 No restrictions apply.
10.4.2.2.3.1   ResidualConfig()
bsResidualSamplingFrequencyIndex Shall fulfil the requirements outlined in
ISO/IEC 23003-1:2007, 6.1.13 and Table 88.
bsResidualFramesPerSAOCFrame Shall fulfil the requirements outlined in
ISO/IEC 23003-1:2007, 6.1.13 and Table 87
bsNumGroupsFGO For restrictions, see 10.4.2.5.
bsResidualPresent[i] No restrictions apply.
bsResidualBands[i] Shall not be encoded with a value larger than the value of
bsTtnBandsLow[i].
bsTtnDualMode[i] No restrictions apply.
bsTtnBandsLow[i] Shall not be encoded with a value larger than the value of
numBands as given by Table 33.
10.4.2.2.4   SAOCExtensionConfigData(1)
No restrictions apply.
ISO/IEC 23003-2:2010/Amd.4:2016(E)

10.4.2.2.5   SAOCExtensionConfigData(2)
The syntactic element SAOCExtensionConfigData(2) shall not be present in case of SAOC-DE profile.
Shall fulfil the requirements outlined in Table 51.
10.4.2.2.6   SAOCExtensionConfigData(3)
No restrictions apply.
10.4.2.2.7   SAOCExtensionConfigData(8)
10.4.2.2.7.1  ObjectMetaData()
bsNumByteMetaData[i] No restrictions apply.
bsMetaData[i][j] Shall be encoded in UTF-8 encoding format.
10.4.2.2.8   SAOCExtensionConfigData(9)
10.4.2.2.8.1   PresetConfig()
bsNumPresets No restrictions apply.
bsNumBytePresetLabel[i] No restrictions apply.
bsPresetLabel[i][j] Shall be encoded in UTF-8 encoding
format.
bsPresetMatrix No restrictions apply.
10.4.2.2.8.2   PresetMatrixData()
bsPresetMatrixType Shall not be encoded with a value of 3.
bsPresetMatrixElements[i][j] No restrictions apply.
10.4.2.2.8.3   PresetMatrixData()
bsPresetUserDataIdentifier[i] Shall be encoded in UTF-8 encoding format.
bsPresetUserDataLen No restrictions apply.
10.4.2.2.9   SAOCExtensionConfigData(10)
The syntactic element SAOCExtensionConfigData(10) shall not be present in case of SAOC-DE profile.
10.4.2.2.9.1   SeparationMetaData()
bsNumSeparationPairs No restrictions apply.
bsSeparationMainObjectID[i] No restrictions apply.
bsSeparationSubObjectID[i] No restrictions apply.
10.4.2.3  Bitstream payload
10.4.2.3.1  SAOCFrame()/SAOCDEFrame()
bsIndependencyFlag   No restrictions apply.
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ISO/IEC 23003-2:2010/Amd.4:2016(E)

10.4.2.3.1.1  SAOCFramingInfo()
bsFramingType No restrictions apply.
bsNumParamSets For restrictions, see 10.4.2.5.
bsParamSlot[i] Shall be in the range 0…bsFrameLength.
10.4.2.3.1.2  EcDataSaoc()
bsXXXdataMode[i][j] Shall fulfil the requirements outlined in ISO/IEC 23003-1:2007, 6.1.13.
Shall not be encoded with the value 2 if EAO mode (residual coding) is
applied.
bsDataPairXXX[i][j] Shall have the value 0 if setIdx == dataSets-1. No further restrictions apply.
bsQuantCoarseXXX[i][j] No restrictions apply.
bsFreqResStrideXXX[i][j] No restrictions apply.
10.4.2.3.1.3  SAOCEcDataPair()
bsPcmCodingXXX[i][j]   No restrictions apply.
10.4.2.3.1.4  SAOCDiffHuffData()
bsDiffType No restrictions apply.
bsCodingScheme No restrictions apply.
10.4.2.3.1.5  SAOCHuffData1D()
hcodFirstBand_XXX bsCodeW shall have a value out of a set of values as defined by column “code-
word” of Tables A.2 and A.3, respectively, and shall have a length as defined by
the corresponding entry in column “length”.
hcod1D_XXX_YY bsCodeW shall have a value out of a set of values as defined by column “code-
word” of Tables A.4 and A.5, respectively, and shall have a length as defined by
the corresponding entry in column ‘length’.
bsSign No restrictions apply.
ISO/IEC 23003-2:2010/Amd.4:2016(E)

10.4.2.3.1.6  SAOCHuffData2DFreqPair()
hcodLavIdx bsCodeW shall have a value out of a set of values as defined by column “code-
word” of Table A.24, and shall have a length as defined by the corresponding
entry in column “length”.
hcodFirstBand_XXX bsCodeW shall have a value out of a set of values as defined by column “code-
word” of Tables A.2 and A.3, respectively, and shall have a length as defined by
the corresponding entry in column “length”.
hcod2D_XXX_YY_FP_LL bsCodeW shall have a value out of a set of values as defined by column “code-
word” of the applicable table out of Tables A.11 to A.22, and shall have a length
as defined by the corresponding entry in column “length”.
hcod1D_XXX_YY bsCodeW shall have a value out of a set of values as defined by column “code-
word” of Tables A.4 and A.5, respectively, and shall have a length as defined by
the corresponding entry in column “length”.
bsSign No restrictions apply.
10.4.2.3.2  SAOCExtensionFrame()
No restrictions apply. Note that in case of bsSaocExtType having values indicated as “N/A” in Table 43,
the parsing function SAOCExtensionFrameData(bsSaocExtType) shall return the value 0, such that
possibly present data is read as bsFillBits (i.e. skipped) and correct parsing of the bitstream can
continue.
bsSaocExtLen No restrictions apply.
bsSaocExtLenAdd No restrictions apply.
bsFillBits No restrictions apply.
10.4.2.3.3  SAOCExtensionFrameData(0)
bsDeLimitEaoUpdate No restrictions apply.
bsDeLimitFgoEAO No restrictions apply.
bsDeLimitBgoEAO No restrictions apply.
bsDcuDynamicUpdate2 No restrictions apply.
bsDcuMode2 No restrictions apply.
bsDcuParam2 No restrictions apply.
10.4.2.4  Transport of SAOC data
10.4.2.4.1  Transport in an MPEG environment
10.4.2.4.1.1  Introduction
In case of transport of SAOC data in an MPEG-4 environment, the following restrictions apply. In case
of SAOCSpecificConfig() (or SAOCDESpecificConfig() for SAOC-DE profile) is conveyed out-of-band, any
in-band SAOCSpecificConfig() (or SAOCDESpecificConfig() for SAOC-DE profile) shall be identical to the
out-of-band one.
6 © ISO 2016 – All rights reserved

ISO/IEC 23003-2:2010/Amd.4:2016(E)

In case of embedding of MPEG SAOC data in MPEG-2/4 AAC payloads, the following restrictions apply.
There must be at least one extension_payload() element with extension_type==EXT_SAOC_DATA (or
extension_type==EXT_SAOC_DE_DATA for SAOC-DE profile) in each AAC frame in order to enable
immediate implicit signalling.
In case of embedding of MPEG SAOC data in MPEG-1/2 Layer I/II/III bistreams, the following restrictions
apply. The first bit of the ancSyncword must be byte-aligned with respect to the first bit of the 0xFFF
syncword of the MPEG-1/2 frame header. The AncDataElement() must be completely included in the
ancillary data of a single MPEG-1/2 frame. There must be at least one AncDataElement() in the ancillary
data of each MPEG-1/2 frame in order to enable immediate implicit signalling.
10.4.2.4.1.2  AncDataElement()
ancSyncword Shall be 0x473.
ancType No restrictions apply.
ancStart No restrictions apply.
ancStop No restrictions apply.
ancLenBytes No restrictions apply.
ancLenBytesAdd No restrictions apply.
ancCrcWord Shall have the value as determined by the procedure specified in 8.2.4.
ancDataSegmentByte A data block formed by concatenation of ancDataSegmentByte as specified in
8.2.4 shall, if ancType==0x0 or ancType==0x1, constitute one SaocDataFrame()
syntax element, padded at the end to obtain an integer number of bytes.
10.4.2.4.1.3  SaocDataFrame(saocHeaderFlag)
saocHeaderFlag No restrictions apply.
saocHeaderLen No restrictions apply.
saocHeaderLenAdd No restrictions apply.
bsFillBits No restrictions apply.
saocTimeAlignFlag No restrictions apply.
saocTimeAlign Shall have an absolute value no larger than two times the number of samples
in the MPEG SAOC PCM frame as defined by bsFrameLength and
bsSamplingFrequencyIndex or bsSamplingFrequency.
10.4.2.4.2  Transport over PCM channels
10.4.2.4.2.1  Introduction
In case of transport of SAOC data over PCM channels, the following restrictions apply. The BuriedData()
data shall be embedded in the LSBs of the PCM channels. Typically, 16 bit PCM samples are used.
However, also other sample precisions shall be supported, e.g. 20 and 24 bits.
ISO/IEC 23003-2:2010/Amd.4:2016(E)

10.4.2.4.2.2  BuriedDataHeader()
bsBDSyncword Shall be 0xAA95.
bsBDChannels Shall have the value of the number of PCM channels in which the
MPEG SAOC data is embedded.
bsBDFramelength Shall define a PCM buried data frame size which is exactly the same
as the MPEG SAOC PCM frame size defined by bsFrameLength and
bsSamplingFrequencyIndex or bsSamplingFrequency.
bdBDSubframes Shall fulfil the restrictions outlined for this syntactic element in
8.3.3.
bsBDReserved Shall be 0.
bsBDAlloc[channel][subframe] Shall not exceed the value of n for n bit PCM samples.
bsBDHeaderCrc Shall fulfil the restrictions outlined for this syntactic element in
8.3.3.
bsBDHeaderPadding Shall be 0.
10.4.2.4.2.3  BuriedDataFrame()
bsBDFramePadding   Shall be 0.
10.4.2.4.2.4  BuriedDataElement()
bsBDType Each BuriedDataFrame() shall at least contain one BuriedDataElement() with
bsBDType set to the value of 4 or 5. In the case of file based applications, the first
frame shall contain a BuriedDataElement() with bsBDType set to the value of 5.
bsBDID Shall be set to a value in the range of 0.7, each value shall be used only once in a
BuriedDataFrame().
bsBDLengthIdx No restrictions apply.
bsBDLength Shall fulfil the restriction outlined for this syntactic element in 8.3.3.
bsBDBytes Shall contain exactly one SaocDataFrame().
bsBDDataCrc Shall fulfil the restrictions outlined for this syntactic element in 8.3.3.
10.4.2.5   Restrictions depending on profiles and levels
10.4.2.5.1  Introduction
Depending on the profile and level associated with the present SAOC bitstream, further restrictions
may apply.
10.4.2.5.2  Baseline SAOC profile
For the Baseline SAOC profile, the following further restrictions apply.
bsSamplingFrequencyIndex Shall be encoded with a value listed in Table AMD1.1.
bsSamplingFrequency Shall be encoded with a value listed in Table AMD1.1.
bsFrameLength Shall be in the range 3.71.
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ISO/IEC 23003-2:2010/Amd.4:2016(E)

bsLowDelayMode Shall be 0.
bsNumObjects Shall be encoded with a value listed in Table AMD1.1.
bsNumDmxChannels Shall be in the range 0.1.
bsNumEAO Shall be encoded with a value listed in Table AMD1.1.
Table — AMD1.1 — Restrictions for the SAOC baseline profile
Level 1 Level 2 Level 3 Level 4
bsSamplingFrequencyIndex 0x3.0xc, 0xf 0x3.0xc, 0xf 0x3.0xc, 0xf 0x0.0xc, 0xf
bsSamplingFrequency ≤48 000 ≤48 000 ≤48 000 ≤96 000
bsNumObjects 0.7 0.15 0.31 0.31
bsNumEAO N/A 0.1 0.3 0.3
bsDcuFlag   No restrictions apply.
10.4.2.5.3   Low Delay SAOC profile
For the Low Delay SAOC profile, the following further restrictions apply.
bsSamplingFrequencyIndex Shall be encoded with a value listed in Table AMD1.2.
bsSamplingFrequency Shall be encoded with a value listed in Table AMD1.2.
bsFrameLength Shall be in the range 3.31.
bsLowDelayMode Shall be 1.
bsNumObjects Shall be encoded with a value listed in Table AMD1.2.
bsNumDmxChannels Shall be encoded with a value listed in Table AMD1.2.
Table — AMD1.2 — Restrictions for the SAOC low delay profile
Level 1 Level 2 Level 3
bsSamplingFrequencyIndex 0x3.0xc, 0xf 0x3.0xc, 0xf 0x3.0xc, 0xf
bsSamplingFrequency ≤48 000 ≤48 000 ≤48 000
bsNumObjects 0.7 0.31 0.31
bsNumDmxChannels 0 0.1 0.1
bsDcuFlag   No restrictions apply.
10.4.2.5.4   Dialogue Enhancement SAOC profile
For the Dialogue Enhancement SAOC profile, the following further restrictions apply.
bsVersion Shall be 0.
bsSamplingFrequencyIndex Shall be in the range 0x3.0xc or 0xf.
bsSamplingFrequency Shall be ≤48 000.
bsFrameLength Shall be in the range 3.71.
bsNumObjects Shall be in the range 0.5.
ISO/IEC 23003-2:2010/Amd.4:2016(E)

bsNumDmxChannels Shall be in the range 0.2.
bsNumFGOs Shall be in the range 0.2.
bsDeLimitFlag Shall be 1.
bsNumEAO Shall be encoded with a value listed in Table AMD1.3. If it is present,
then it shall be equal to bsNumFGOs.
Table — AMD1.3 — Restrictions for the SAOC Dialogue Enhancement Profile
Level 1 Level 2
bsNumEAO N/A 0.2
bsDcuFlag   Shall be 0.
10.5  SAOC decoder/transcoder
10.5.1  Characteristics
10.5.1.2  General
The SAOC decoder/transcoder can be implemented in two different versions:
— High Quality (HQ) SAOC
— Low Power (LP) SAOC
10.5.2  Test procedure
10.5.2.1  Downmix decoders
An SAOC decoder/transcoder can be used in combination with a downmix decoder. In this case, the
downmix decoder shall fulfill the conformance criteria that are applicable to it. Nevertheless, for the
conformance test procedure, the PCM coding shall be applied to a downmix signal.
10.5.2.2  SAOC decoder/transcoder test procedure
With regard to the definition and further details of the conformance criterion RMS/LSB being used to
test SAOC decoders/transcoders, reference is made to ISO/IEC 14496.
The conformance test procedure for SAOC decoders/transcoders internally creates a reference for
comparison, given the conformance test sequence and the output from the decoder under test as
outlined in Figure AMD1.3.
10 © ISO 2016 – All rights reserved

ISO/IEC 23003-2:2010/Amd.4:2016(E)

Param. test
Com
paris
Yes/No
on
REF
bs Param./mps_bs
SAOC
rend
SAOC test
REF
REF REF
upmix /mps_dmx
RMS
dmx
/LSB
TEST
Param./mps_bs Yes/No
com
SAOC
paris
TEST
TEST TEST
on
upmix /mps_dmx
Figure — AMD1.3 — Block diagram of the SAOC decoding/transcoding conformance test
procedure
The relevant signals and data are:
— Data from the conformance test sequence:
— bs: SAOC bitstream from the conformance test sequence;
— rend: rendering information from the conformance test sequence;
— dmx: SAOC downmix signal from the conformance test sequence.
— Outputs for comparison from the SAOC decoder/transcoder implementation instances:
REF REF
— upmix /dmx_bs : output from the reference SAOC decoder/transcoder;
TEST TEST
— upmix /dmx_bs : output from the SAOC decoder/transcoder under test;
REF
— Param./mps_bs : Parametric or/and MPS data from the reference SAOC decoder/transcoder;
TEST
— Param./mps_bs : Parametric or/and MPS data from the SAOC decoder/transcoder under test.
— Conformance test modes:
— SAOC test (RMS/LSB comparison): This module calculates the difference signals between the
output from the SAOC decoder/transcoder under test and the internal reference. The maximum
amplitude of the difference signal (Diff max) as well as the RMS of the difference signal are
calculated. The conformance criteria are specified with respect to PCM-sample in the range
–32768 . 32767.
— Param test (ASCII comparison): This module calculates the difference between the obtained
output parameters (e.g. MPS data) from the SAOC decoder/transcoder under test and the
internal reference.
10.5.3  Test sequences
To test SAOC decoder/transcoder, ISO/IEC JTC 1/SC 29 supplies a number of test sequences. The n
...