ISO/IEC 23008-3:2019/Amd 2:2020

INTERNATIONAL ISO/IEC
STANDARD 23008-3
Second edition
2019-02
AMENDMENT 2
2020-11
Information technology — High
efficiency coding and media delivery
in heterogeneous environments —
Part 3:
3D audio
AMENDMENT 2: 3D Audio baseline
profile, corrections and improvements
Technologies de l'information — Codage à haute efficacité et livraison
des medias dans des environnements hétérogènes —
Partie 3: Audio 3D
AMENDEMENT 2: Profil de base audio 3D, corrections et
améliorations
Reference number
ISO/IEC 23008-3:2019/Amd.2:2020(E)
©
ISO/IEC 2020
ISO/IEC 23008-3:2019/Amd.2:2020(E)

© ISO/IEC 2020
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ii © ISO/IEC 2020 – All rights reserved

ISO/IEC 23008-3:2019/Amd.2:2020(E)

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Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
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© ISO/IEC 2020 – All rights reserved iii

ISO/IEC 23008-3:2019/Amd.2:2020(E)
Information technology — High efficiency coding and
media delivery in heterogeneous environments —
Part 3:
3D audio
AMENDMENT 2: 3D Audio baseline profile, corrections and
improvements
Subclause 4.8.2 (Profiles)
After list item 3, add:
4) The baseline profile is a subset of the low-complexity profile which supports channel and object
signals.
Replace Table 2 with:
Table 2 — Summary of the location of and normative reference to the definitions of
MPEG-H 3D audio profiles
MPEG-H 3D
MPEG-H 3D
MPEG-H 3D audio
audio
Defined in Sub- USAC
audio
Tool/Module
Low-
ISO/IEC clause 23003-3
Baseline
High profile complexity
profile
profile
block
14496-3 4.6.11 X X X X
switching
AAC based 14496-3 4.6.11 X X X X
window
Additional
shapes
23003-3 6.2.9.3 X X X X
windows
AAC based 14496-3 4.6.11 X X X X
filter bank
additional USAC 23003-3 7.9 X X X X
TNS 14496-3 4.6.9 X X X X
intensity 14496-3 4.6.8.2
coupling 14496-3 4.6.8.3
perceptual PNS 14496-3 4.6.13
noise
noise filling 23003-3 7.2 X X X X
synthesis
a
Restrictions apply dependent on the levels.
b
Implementation of binaural rendering is only mandated if headphone reproduction is supported.
c
Multi-band DRC-1 shall be applied in the STFT domain of the TD format converter.
d
The TD format converter downmix shall be applied for downmixing.
e
In order to achieve target complexity for the LC profile at a given level, study Annex G.
f
File format encapsulation is independent of the profile that is used for the bitstream. A profile level indicator is part of
the file format specification (see subclause 20.4).
© ISO/IEC 2020 – All rights reserved 1

ISO/IEC 23008-3:2019/Amd.2:2020(E)

Table 2 (continued)
MPEG-H 3D
MPEG-H 3D
MPEG-H 3D audio
audio
Defined in Sub- USAC
audio
Tool/Module
Low-
ISO/IEC clause 23003-3
Baseline
High profile complexity
profile
profile
basic mid/side
14496-3 4.6.8.1 X X X X
coding
MS
MDCT based com-
23003-3 7.7.2 X X X X
plex prediction
non-uniform 14496-3 4.6.1 X X X X
quantization
uniform 23003-3 7.1 X X X
Huffman 14496-3 4.6.3
entropy
context adaptive
coding
23003-3 7.4 X X X X
arithmetic coding
base 14496-3 4.6.18 X X
SBR
enhanced 23003-3 7.5 X X
8.6.4 /
parametric stereo 14496-3
8.A
paramet- MPEG surround
ric stereo 2-1-2 (incl. residu- 23003-3 6.2.13 X X
extension al coding)
quad channel
23008-3 5,5 X
element
ACELP 23003-3 7.14 X X X
frequency scale factor based 14496-3 4.6.2 X X X X
domain
noise shap-
LPC based 23003-3 X X X
ing
intelligent
IGF for FD 23008-3 X X X
gap filling
IGF for TCX and
23008-3 X X
improved
TBE in ACELP
LPD coding
LPD stereo 23008-3 X X
frequency-
predictors domain prediction
23008-3 X X X
for FD and time-domain
post-filtering
frequency-
predictors domain prediction
23008-3 X X
for TCX and time-domain
post-filtering
a
Restrictions apply dependent on the levels.
b
Implementation of binaural rendering is only mandated if headphone reproduction is supported.
c
Multi-band DRC-1 shall be applied in the STFT domain of the TD format converter.
d
The TD format converter downmix shall be applied for downmixing.
e
In order to achieve target complexity for the LC profile at a given level, study Annex G.
f
File format encapsulation is independent of the profile that is used for the bitstream. A profile level indicator is part of
the file format specification (see subclause 20.4).
2 © ISO/IEC 2020 – All rights reserved

ISO/IEC 23008-3:2019/Amd.2:2020(E)

Table 2 (continued)
MPEG-H 3D
MPEG-H 3D
MPEG-H 3D audio
audio
Defined in Sub- USAC
audio
Tool/Module
Low-
ISO/IEC clause 23003-3
Baseline
High profile complexity
profile
profile
discrete
multi-chan- MCT 23008-3 X X X
nel coding
format
d d
generic downmix 23008-3 10, 24 X X X
converter
immersive ren-
immersive
d d
dering within 23008-3 11, 25 X X X
rendering
format converter
metadata audio
elements (MAE)
and audio scene
static
23008-3 15 X X X
information (ASI)
metadata
decoder and
renderer
object audio
dynamic
metadata (OAM)
object 23008-3 7, 8 X X X
decoder and
metadata
renderer
MPEG surround
MPS 23003-1 10 X
extension
decoder and
SAOC-3D 23008-3 9 X
renderer
decoder and
e
23008-3 12 X X
renderer
near field
a
23008-3 X X
compensation
subband direc-
23008-3 X
HOA tional prediction
parametric ambi-
ance replication 23008-3 X
(PAR)
phase-based
23008-3 X
decorrelation
FD-binaural,
b b
23008-3 13 X X X
TD-binaural
Binaural
HOA2Binaural
b
23008-3 X X
H2B
a
Restrictions apply dependent on the levels.
b
Implementation of binaural rendering is only mandated if headphone reproduction is supported.
c
Multi-band DRC-1 shall be applied in the STFT domain of the TD format converter.
d
The TD format converter downmix shall be applied for downmixing.
e
In order to achieve target complexity for the LC profile at a given level, study Annex G.
f
File format encapsulation is independent of the profile that is used for the bitstream. A profile level indicator is part of
the file format specification (see subclause 20.4).
© ISO/IEC 2020 – All rights reserved 3

ISO/IEC 23008-3:2019/Amd.2:2020(E)

Table 2 (continued)
MPEG-H 3D
MPEG-H 3D
MPEG-H 3D audio
audio
Defined in Sub- USAC
audio
Tool/Module
Low-
ISO/IEC clause 23003-3
Baseline
High profile complexity
profile
profile
c c
DRC-1 23003-4 X X X
DRC-2 (single
23003-4 X X X
band)
DRC
DRC-2 (multi
23003-4
band)
DRC-3 (single
23003-4 X X X
band)
sample rate
23008-3 X X X
converter
23008-3
unguided clipping
peak limiter D X X X
prevention
23003-4
loudness metada-
23003-4 6 X X X
ta and handling
loudness
loudness com-
23008-3 X X X
pensation
MPEG-H 3D
23008-3 14 X X X
Audio stream
truncation
MHAS
message and CRC
23008-3 X X X
packet type, ASI
packet type
carriage of
MPEG-H 3D audio
file format 23008-3 f
in ISO base media
file format
interfaces and
interfaces
processing for in-
and process- 23008-3 17,18 X X X
teraction data and
ing
local setup info
carriage of
generic data for
carriage of
the interaction 23008-3 X X
generic data
with system
engine
tonal component
TCC 23008-3 X
coding
IC internal channel 23008-3 X
high resolution
HREP envelope 23008-3 X
processing
a
Restrictions apply dependent on the levels.
b
Implementation of binaural rendering is only mandated if headphone reproduction is supported.
c
Multi-band DRC-1 shall be applied in the STFT domain of the TD format converter.
d
The TD format converter downmix shall be applied for downmixing.
e
In order to achieve target complexity for the LC profile at a given level, study Annex G.
f
File format encapsulation is independent of the profile that is used for the bitstream. A profile level indicator is part of
the file format specification (see subclause 20.4).
4 © ISO/IEC 2020 – All rights reserved

ISO/IEC 23008-3:2019/Amd.2:2020(E)

The baseline profile is a subset of the low-complexity profile. If a decoder implementation supports
decoding of low complexity profile level 3 bitstreams and supports the configuration extension
CompatibleProfileLevelSet(), then the decoder shall support decoding of bitstreams encoded according
to the baseline profile level 3. Bitstreams complying to the baseline profile may be signalled using:
— the mpegh3daProfileLevelIndication field set to indicate baseline profile as specified in Table 64, or
alternatively,
— the mpegh3daProfileLevelIndication field set to indicate low complexity profile as specified in
Table 64 and the CompatibleProfileLevelSet configuration extension for indicating compatibility to
baseline profile, as described in Annex P.
Additionally, it is strongly recommended that low complexity profile bitstreams conforming to the
baseline profile, are signalled using the profile and level values for mpegh3daProfileLevelIndication
and CompatibleSetIndication given in Table P.1.

Subclause 4.8.2.4
Add new subclauses 4.8.2.5, 4.8.2.6 and 4.8.2.7 after subclause 4.8.2.4:

4.8.2.5  Levels of the baseline profile
4.8.2.5.1  General
Table AMD2.1 — Levels and their corresponding restrictions for the baseline profile
Max. number of
Max. Max. number of Max. number of
core channels in
Level sampling decoder processed channels in
compressed data
rate core channels referenceLayout
stream
1 48000 10 5 5
2 48000 18 9 9
a b a b
3 48000 32 16 or 24 16 or 24
4 48000 56 28 24
5 96000 56 28 24
a
No additional complexity restrictions are applied.
b
Additional complexity restrictions given in 4.8.2.5.1 are applied.

— The use of switch groups determines the subset of core channels from the core channels in the
bitstream that shall be decoded.
— If the mae_AudioSceneInfo() contains switch groups (mae_numSwitchGroups>0), then the
elementLengthPresent flag shall be 1.
— The number of channels of the signalled referenceLayout shall not exceed the values defined in the
levels in Table AMD2.1.
— Object renderer and binaural renderer that perform at least as well as the object and binaural
renderer specified in Clauses 8 and 13 may be integrated using the output interfaces for un-rendered
channels and objects described in subclause 17.10.
© ISO/IEC 2020 – All rights reserved 5

ISO/IEC 23008-3:2019/Amd.2:2020(E)

NOTE The performance recommendation covers the behaviour of the decoder over the complete
decoding and rendering chain, especially for the case of configuration changes as described in subclause
5.5.6, mixing of channel and object content or DRC processing, loudness compensation and user interactivity.
— For Level 3 the maximum number of decoder processed core channels and maximum number of
channels signalled in referenceLayout is:
a) 16 if no additional complexity restrictions are applied,
b) 24 if all the complexity restrictions in 4.8.2.5.1 are applied.

4.8.2.5.2  Complexity restrictions for Level 3 with more than 16 decoder processed core channels
— signalGroupType in Signals3d() shall indicate SignalGroupTypeObject (Objects only).
— usacElementType[elemIdx] in mpegh3daDecoderConfig() shall indicate ID_USAC_SCE or ID_
USAC_EXT.
— noiseFilling and enhancedNoiseFilling in mpegh3daCoreConfig() shall be set to "0".
— usacExtElementType in mpegh3daExtElementConfig() shall not be set to ID_EXT_ELE_MCT.
— Long term prediction filter shall not be used, i.e., ltpf_data_present and common_ltpf shall be
set to "0".
— Frequency domain predictor shall not be used, i.e., fdp_data_present shall be set to "0".
4.8.2.6  Restrictions for the baseline profile and levels
All restrictions defined for low complexity profile in subclause 4.8.2.2 shall apply.
The LPD path of the core coder and HOA path are not supported.
Restrictions defined in Table AMD2.2 shall apply.
Table AMD2.2 — Baseline profile restrictions
MPEG-H 3D audio bit field Structure Use description
phaseAlignStrength downmixC
...