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Content for  TS 26.258  Word version:  18.1.0

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1  Scopep. 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 (TS 26.253), Rendering (TS 26.254), Error Concealment of Lost Packets (TS 26.255) and Jitter Buffer Management (JBM) (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 TS 26.252 (Test sequences).
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2  Referencesp. 6

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 26.253: "Codec for Immersive Voice and Audio Services - Detailed Algorithmic Description incl. RTP payload format and SDP parameter definitions".
[3]
TS 26.254: "Codec for Immersive Voice and Audio Services - Rendering".
[4]
TS 26.255: "Codec for Immersive Voice and Audio Services - Error concealment of lost packets".
[5]
TS 26.256: "Codec for Immersive Voice and Audio Services - Jitter Buffer Management".
[6]
TS 26.252: "Codec for Immersive Voice and Audio Services - Test Sequences".
[7]
RFC 3550:  "RTP: A Transport Protocol for Real-Time Applications".
[8]
Recommendation ITU-T G.191 (03/23): "Software tools for speech and audio coding standardization".
[9]
Recommendation ITU-T G.192: "A common digital parallel interface for speech standardization activities".
[10]
ISO/IEC 23008-3:2015: "High efficiency coding and media delivery in heterogeneous environments - Part 3: 3D audio"
[11]
ISO/IEC 23091-3:2018: "Coding-independent code points - Part 3: Audio"
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3  Definitions of terms, symbols and abbreviationsp. 7

3.1  Termsp. 7

For the purposes of the present document, the terms given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
bslbf:
Bit string, left bit first. Bit strings are written as a string of 1s and 0s within single quote marks, for example '1000 0001'. Blanks within a bit string are for ease of reading and have no significance.
uimsbf:
Unsigned integer, most significant bit first.
vlclbf:
Variable length code, left bit first, where "left" refers to the order in which the variable length codes are written.
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3.2  Symbolsp. 7

Void.

3.3  Abbreviationsp. 7

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ACN
Ambisonic Channel Number
CICP
Coding-independent Code Points
CSV
Comma Separated Values
EVS
Enhanced Voice Services
FB
Fullband
FEC
Frame Erasure Concealment
HRTF
Head Related Transfer Function
ISM
Independent Stream with Metadata
IVAS
Immersive Voice and Audio Services
ISAR
Immersive Audio for Split Rendering Scenarios
JBM
Jitter Buffer Management
LFE
Low Frequency Enhancement
MASA
Metadata-Assisted Spatial Audio
MC
Multi-channel
NB
Narrowband
OBA
Object Based Audio
SBA
Scene Based Audio
SID
Silence Insertion Descriptor
SWB
Super Wideband
WB
Wideband
WMOPS
Weighted Millions of Operations Per Second
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