3 Definitions, symbols and abbreviations

26.1183GPPRelease 17TSVirtual Reality (VR) profiles for streaming applications

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [1] 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 [1].

bitstream: a bitstream that conforms to a video encoding format and certain Operation Point.

field of view: the extent of visible area expressed with vertical and horizontal angles, in degrees in the 3GPP 3DOF reference system.

operation point: a collection of discrete combinations of different content formats including spatial and temporal resolutions, colour mapping, transfer functions, rendering metadata and the encoding format.

pose: position derived by the head tracking sensor expressed by (azimuth; elevation; tilt angle).

receiver: a receiver that can decode and render any bitstream that is conforming to a certain Operation Point.

viewport: the part of the 3DOF content to render based on the pose and the field of view.

3.2 Symbols

For the purposes of the present document, the following symbols apply:

α yaw of the 3GPP 3DOF coordinate system

β pitch of the 3GPP 3DOF coordinate system

γ roll of the 3GPP 3DOF coordinate system

ϕ azimuth of the 3GPP 3DOF coordinate system

θ elevation of the 3GPP 3DOF coordinate system

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [1] 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 [1].

3DOF 3 Degrees of freedom

ACN Ambisonics Channel Number

API Application Programming Interface

AVC Advanced Video Coding

BMFF Base Media File Format

BRIR Binaural Room Impulse Response

CMP Cube-Map Projection

CIBR Common Informative Binaural Renderer

DASH Dynamic Adaptive Streaming over HTTP

DRC Dynamic Range Control

EOTF Electro-Optical Transfer Function

ERP EquiRectangular Projection

ESD Equivalent Spatial Domain

FFT Fast Fourier Transform

FIR Finite Impulse Response

FOA First Order Ambisonics

FOV Field Of View

GPU Graphics Processing Unit

HDR High Dynamic Range

HDTV High Definition TeleVision

HEVC High Efficiency Video Coding

HMD Head Mounted Display

HOA High Order Ambisonics

HRD Hypothetical Reference Decoder

HRIR Head-Related Impulse Responses

HRTF Head-Related Transfer Function

HTTP HyperText Transfer Protocol

IFFT Inverse FFT

IRFFT Inverse RFFT

MAE MPEG-H Audio Metadata information

MCC Metrics Collection and Computation

MHAS MPEG-H Audio Stream

MIME Multipurpose Internet Mail Extensions

MPD Media Presentation Description

MPEG Moving Pictures Experts Group

NAL Network Abstraction Layer

OMAF Omnidirectional MediA Format

PCM Pulse Code Modulation

RAP Random Access Point

RFFT Real FFT

RWP Region-Wise Packing

SDR Standard Dynamic Range

SEI Supplemental Enhancement Information

SN3D Schmidt semi-normalisation

SOFA Spatially Oriented Format for Acoustics

SPS Sequence Parameter Set

SRQR Spherical Region-wise Quality Ranking

VCL Video Coding Layer

VST Virtual Studio Technology

VUI Video Usability Information

VR Virtual Reality