ISO/IEC 23008-3:2022
(Main)Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 3: 3D audio
Information technology — High efficiency coding and media delivery in heterogeneous environments — Part 3: 3D audio
This document specifies technology that supports the efficient transmission of immersive audio signals and flexible rendering for the playback of immersive audio in a wide variety of listening scenarios. These include home theatre setups with 3D loudspeaker configurations, 22.2 loudspeaker systems, automotive entertainment systems and playback over headphones connected to a tablet or smartphone.
Technologies de l'information — Codage à haute efficacité et livraison des medias dans des environnements hétérogènes — Partie 3: Audio 3D
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Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 23008-3
Third edition
2022-08
Information technology — High
efficiency coding and media delivery
in heterogeneous environments —
Part 3:
3D audio
Technologies de l'information — Codage à haute efficacité et livraison
des medias dans des environnements hétérogènes —
Partie 3: Audio 3D
Reference number
ISO/IEC 23008-3:2022(E)
© ISO/IEC 2022
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ISO/IEC 23008-3:2022(E)
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Published in Switzerland
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ISO/IEC 23008-3:2022(E)
Contents Page
Foreword . xiii
Introduction .xiv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols, abbreviated terms and mnemonics . 2
3.1 Terms, definitions, symbols and abbreviated terms . 2
3.2 Mnemonics . 2
4 Technical overview . 2
4.1 Decoder block diagram . 2
4.2 Overview over the codec building blocks . 3
4.3 Efficient combination of decoder processing blocks in the time domain and QMF
domain . 6
4.4 Rule set for determining processing domains . 9
4.4.1 Audio core codec processing domain . 9
4.4.2 Mixing . 10
4.4.3 DRC-1 Operation domains (DRC in rendering context) . 10
4.4.4 Audio core codec interface domain to rendering . 10
4.4.5 Rendering context . 10
4.4.6 Post-processing context . 11
4.4.7 End-of-chain context . 11
4.5 Sample rate converter . 11
4.6 Decoder delay . 11
4.7 Contribution mode of MPEG-H 3D audio . 12
4.8 MPEG-H 3D audio profiles and levels . 12
4.8.1 General . 12
4.8.2 Profiles . 13
5 MPEG-H 3D audio core decoder . 27
5.1 Definitions . 27
5.1.1 Joint stereo . 27
5.1.2 MPEG surround based stereo (MPS 212) . 28
5.2 Syntax . 28
5.2.1 General . 28
5.2.2 Decoder configuration . 28
5.2.3 MPEG-H 3D audio core bitstream payloads . 51
5.3 Data structure . 72
5.3.1 General . 72
5.3.2 General configuration data elements . 72
5.3.3 Loudspeaker configuration data elements . 75
5.3.4 Core decoder configuration data elements . 77
5.3.5 Downmix matrix data elements . 81
5.3.6 HOA rendering matrix data elements . 84
5.3.7 Signal group information elements . 87
5.3.8 Low frequency enhancement (LFE) channel element, mpegh3daLfeElement() . 87
5.3.9 Compatible profile and levels sets. 88
5.4 Configuration element descriptions . 88
5.4.1 General . 88
5.4.2 Downmix configuration . 88
5.4.3 HOA rendering matrix configuration . 94
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ISO/IEC 23008-3:2022(E)
5.5 Tool descriptions . 98
5.5.1 General. 98
5.5.2 Quad channel element . 98
5.5.3 Transform splitting . 100
5.5.4 MPEG surround for mono to stereo upmixing . 107
5.5.5 Enhanced noise filling . 110
5.5.6 Audio pre-roll . 134
5.5.7 Fullband LPD . 137
5.5.8 Time-domain bandwidth extension . 148
5.5.9 LPD stereo coding . 161
5.5.10 Multichannel coding tool . 169
5.5.11 Filterbank and block switching . 179
5.5.12 Frequency domain prediction . 180
5.5.13 Long-term postfilter. 183
5.5.14 Tonal component coding . 188
5.5.15 Internal channel on MPS212 for low complexity format conversion . 198
5.5.16 High resolution envelope processing (HREP) tool . 210
5.6 Buffer requirements . 216
5.6.1 Minimum decoder input buffer . 216
5.6.2 Bit reservoir . 216
5.6.3 Maximum bit rate. 217
5.7 Stream access point requirements and inter-frame dependency . 217
6 Dynamic range control and loudness processing . 218
6.1 General. 218
6.2 Description . 218
6.3 Syntax . 219
6.3.1 Loudness metadata . 219
6.3.2 Dynamic range control metadata . 219
6.3.3 Data elements . 220
6.4 Decoding process . 222
6.4.1 General. 222
6.4.2 Dynamic range control . 224
6.4.3 Usage of downmixId in MPEG-H . 224
6.4.4 DRC set selection process . 225
6.4.5 DRC-1 for SAOC 3D Content . 227
6.4.6 DRC-1 for HOA content . 228
6.4.7 Loudness normalization . 229
6.4.8 Peak limiter . 230
6.4.9 Time-synchronization of DRC gains . 230
6.4.10 Default parameters . 230
7 Object metadata decoding . 230
7.1 General. 230
7.2 Description . 230
7.3 Syntax . 231
7.3.1 Object metadata configuration . 231
7.3.2 Top level object metadata syntax . 232
7.3.3 Subsidiary payloads for efficient object metadata decoding . 233
7.3.4 Subsidiary payloads for object metadata decoding with low delay . 239
7.3.5 Enhanced object metadata configuration . 244
7.4 Data structure . 247
7.4.1 Definition of ObjectMetadataConfig() payloads . 247
7.4.2 Efficient object metadata decoding . 248
7.4.3 Object metadata decoding with low delay . 256
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ISO/IEC 23008-3:2022(E)
7.4.4 Enhanced object metadata . 261
8 Object rendering . 264
8.1 Description . 264
8.2 Terms and definitions . 264
8.3 Input data . 264
8.4 Processing . 265
8.4.1 General remark . 265
8.4.2 Imaginary loudspeakers . 266
8.4.3 Dividing the loudspeaker setup into a triangle mesh . 267
8.4.4 Rendering algorithm . 269
9 SAOC 3D . 273
9.1 Description . 273
9.2 Definitions . 273
9.3 Delay and synchronization . 275
9.4 Syntax . 275
9.4.1 Payloads for SAOC 3D . 275
9.4.2 Definition of SAOC 3D payloads . 279
9.5 SAOC 3D processing . 281
9.5.1 Compressed data stream decoding and dequantization of SAOC 3D data . 281
9.5.2 Time/frequency transforms . 281
9.5.3 Signals and parameters . 282
9.5.4 SAOC 3D decoding . 284
9.5.5 Dual mode . 289
10 Generic loudspeaker rendering/format conversion . 289
10.1 Description . 289
10.2 Definitions . 291
10.2.1 General remarks . 291
10.2.2 Variable definitions . 291
10.3 Processing . 291
10.3.1 Application of transmitted downmix matrices . 291
10.3.2 Application of transmitted equalizer settings . 296
10.3.3 Downmix processing involving multiple channel groups . 296
10.3.4 Initialization of the format converter . 297
10.3.5 Audio signal processing. 313
11 Immersive loudspeaker rendering/format conversion . 319
11.1 Description . 319
11.2 Syntax . 321
11.3 Definitions . 321
11.3.1 General remarks . 321
11.3.2 Variable definitions . 322
11.4 Processing . 323
11.4.1 Initialization of the format converter . 323
11.4.2 Audio signal processing. 366
12 Higher order ambisonics (HOA) . 373
12.1 Technical overview . 373
12.1.1 Block diagram . 373
12.1.2 Overview of the decoder tools . 374
12.2 Syntax . 376
12.2.1 Configuration of HOA elements . 376
12.2.2 Payloads of HOA elements . 380
12.3 Data structure . 393
12.3.1 Definitions of HOA Config . 393
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ISO/IEC 23008-3:2022(E)
12.3.2 Syntax of getSubbandBandwidths() . 397
12.3.3 Definitions of HOA payload . 398
12.4 HOA tool description . 406
12.4.1 HOA frame converter . 406
12.4.2 Spatial HOA decoding . 423
12.4.3 HOA renderer . 452
12.4.4 Layered coding for HOA . 461
13 Binaural renderer . 464
13.1 General. 464
13.2 Frequency-domain binaural renderer . 464
13.2.1 General. 464
13.2.2 Definitions . 466
13.2.3 Parameterization of binaural room impulse responses . 470
13.2.4 Frequency-domain binaural processing . 482
13.3 Time-domain binaural renderer . 489
13.3.1 General. 489
13.3.2 Definitions . 490
13.3.3 Parameterization of binaural room impulse responses . 492
13.3.4 Time-domain binaural processing . 497
14 MPEG-H 3D audio stream (MHAS) . 498
14.1 Overview . 498
14.2 Syntax . 498
14.2.1 Main MHAS syntax elements . 498
14.2.2 Subsidiary MHAS syntax elements . 500
14.3 Semantics . 501
14.3.1 mpeghAudioStreamPacket() . 501
14.3.2 MHASPacketPayload() . 502
14.3.3 Subsidiary MHAS packets. 503
14.4 Description of MHASPacketTypes . 503
14.4.1 PACTYP_FILLDATA .
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