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TS 26.258
Codec for Immersive Voice and Audio Services
C code (floating-point)

3GPP‑Page   ETSI‑search  
V18.0.0 (Wzip)  2023/09  47 p.
Rapporteur:
Mr. Multrus, Markus
Fraunhofer IIS

full Table of Contents for  TS 26.258  Word version:  18.0.0

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1 Scope  2 References  3 Definitions of terms, symbols and abbreviations  4 C code structure  5 File Formats  A Metadata-assisted spatial audio (MASA) format  B Binary renderer config metadata format  $ Change history 

 

1  Scope  p. 6

Attached to this document is an electronic copy of the floating-point C code for the Immersive Voice and Audio Services (IVAS) Codec. This C code is the unique alternative reference specification besides the fixed-point C code for the IVAS Codec (3GPP TS 26.251) for a standard compliant implementation of the IVAS Codec (3GPP TS 26.253), Rendering (3GPP TS 26.254), Error Concealment of Lost Packets (3GPP TS 26.255) and Jitter Buffer Management (JBM) (3GPP TS 26.256).
The bit-exact fixed-point C code in 3GPP TS 26.251 is the preferred implementation for all applications, but the floating-point codec may be used instead of the fixed-point codec when the implementation platform is better suited for a floating-point implementation.
Requirements for any implementation of the IVAS codec to be standard compliant are specified in 3GPP TS 26.252 (Test sequences).
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2  References  p. 6

3  Definitions of terms, symbols and abbreviations  p. 7

3.1  Terms  p. 7

3.2  Symbols  p. 7

3.3  Abbreviations  p. 7

4  C code structure  p. 7

4.1  Contents of the C source code  p. 8

4.2  Program execution  p. 8

5  File Formats  p. 9

5.1  Audio Input/output file format  p. 9

5.2  Rate switching profile (encoder input)  p. 11

5.3  Bandwidth switching profile (encoder input)  p. 11

5.4  Channel-aware configuration file (encoder input and decoder output)  p. 11

5.5  Object based audio metadata file (encoder/renderer input and decoder output)  p. 12

5.6  Metadata-assisted spatial audio (MASA) metadata file (encoder/renderer input and decoder output)  p. 12

5.7  Parameter bitstream file (encoder output / decoder input)  p. 12

5.7.1  ITU-T G.192 compliant format  p. 12

5.8  VoIP parameter bitstream file (decoder input)  p. 13

5.9  JBM trace file (decoder output)  p. 13

5.10  HRTF filter file (decoder/renderer input)  p. 13

5.11  Head rotation trajectory file (decoder/renderer input)  p. 14

5.12  Reference rotation/vector file (decoder/renderer input)  p. 15

5.12.1  Reference Rotation format  p. 15

5.12.2  Reference Vector format  p. 15

5.13  External orientation file (decoder/renderer input)  p. 16

5.14  Renderer config file (decoder/renderer input)  p. 18

5.14.1  Binary renderer config metadata format  p. 18

5.14.2  Text renderer config metadata format  p. 18

5.15  Scene description file (renderer input)  p. 19

A (Normative)  Metadata-assisted spatial audio (MASA) format  p. 23

A.1  General  p. 23

A.2  MASA format metadata structure  p. 23

A.3  MASA format time-frequency resolution  p. 25

A.4  MASA descriptive metadata parameters  p. 26

A.5  MASA spatial metadata parameters  p. 31

B (Normative)  Binary renderer config metadata format  p. 34

B.1  Definition of binary renderer config metadata format  p. 34

B.2  Support Elements Look-up Tables  p. 40

$  Change history  p. 47

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