ISO/IEC 23008-3:2019
(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
Second edition
2019-02
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 2019
© ISO/IEC 2019
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ii © ISO/IEC 2019 – All rights reserved
Contents Page
Foreword . x
Introduction . xii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols, abbreviations 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 . 9
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 . 10
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 . 12
5 MPEG-H 3D audio core decoder . 22
5.1 Definitions . 22
5.1.1 Joint stereo . 22
5.1.2 MPEG surround based stereo (MPS 212) . 22
5.2 Syntax . 22
5.2.1 General . 22
5.2.2 Decoder configuration . 23
5.2.3 MPEG-H 3D audio core bitstream payloads . 41
5.3 Data structure . 60
5.3.1 General . 60
5.3.2 General configuration data elements . 61
5.3.3 Loudspeaker configuration data elements . 63
5.3.4 Core decoder configuration data elements . 65
5.3.5 Downmix matrix data elements . 69
5.3.6 HOA rendering matrix data elements . 72
5.3.7 Signal group information elements . 74
5.3.8 Low frequency enhancement (LFE) channel element, mpegh3daLfeElement() . 75
5.4 Configuration element descriptions . 75
5.4.1 General . 75
5.4.2 Downmix configuration . 76
5.4.3 HOA rendering matrix configuration . 81
5.5 Tool descriptions . 86
5.5.1 General . 86
5.5.2 Quad channel element . 86
5.5.3 Transform splitting . 88
© ISO/IEC 2019 – All rights reserved iii
5.5.4 MPEG surround for mono to stereo upmixing . 95
5.5.5 Enhanced noise filling . 97
5.5.6 Audio pre-roll . 121
5.5.7 Fullband LPD . 124
5.5.8 Time-domain bandwidth extension. 135
5.5.9 LPD stereo coding . 148
5.5.10 Multichannel coding tool . 155
5.5.11 Filterbank and block switching . 166
5.5.12 Frequency domain prediction . 166
5.5.13 Long-term postfilter . 169
5.5.14 Tonal component coding . 175
5.5.15 Internal channel on MPS212 for low complexity format conversion . 184
5.5.16 High resolution envelope processing (HREP) tool . 196
5.6 Buffer requirements . 202
5.6.1 Minimum decoder input buffer . 202
5.6.2 Bit reservoir . 203
5.6.3 Maximum bit rate . 203
5.7 Stream access point requirements and inter-frame dependency . 203
6 Dynamic range control and loudness processing . 205
6.1 General . 205
6.2 Description . 205
6.3 Syntax . 205
6.3.1 Loudness metadata . 205
6.3.2 Dynamic range control metadata. 205
6.3.3 Data elements . 206
6.4 Decoding process . 207
6.4.1 General . 207
6.4.2 Dynamic range control . 209
6.4.3 Usage of downmixId in MPEG-H . 209
6.4.4 DRC set selection process . 210
6.4.5 DRC-1 for SAOC 3D Content . 212
6.4.6 DRC-1 for HOA content . 212
6.4.7 Loudness normalization . 214
6.4.8 Peak limiter . 214
6.4.9 Time-synchronization of DRC gains . 214
6.4.10 Default parameters . 214
7 Object metadata decoding . 215
7.1 General . 215
7.2 Description . 215
7.3 Syntax . 216
7.3.1 Object met
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