ISO/IEC 23008-1:2017 情報技術—異種環境での高効率コーディングとメディア配信—パート1：MPEGメディアトランスポート（MMT） | ページ 6

3.1.1

access unit

AU

smallest media data entity to which timing information can be attributed

3.1.2

asset

any multimedia data entity that is associated with a unique identifier and that is used for building a multimedia presentation

3.1.3

dependent asset

asset (3.1.2) for which one or more other assets are necessary for decoding of the contained media content

3.1.4

encoding symbol

unit of data generated by the encoding process

3.1.5

encoding symbol block

set of encoding symbols (3.1.4)

3.1.6

FEC code

algorithm for encoding data such that the encoded data flow is resilient to data loss

3.1.7

FEC encoded flow

logical set of flows that consists of an FEC source flow (3.1.11) and one or more associated FEC repair flows (3.1.9)

3.1.8

FEC payload ID

identifier that identifies the contents of an MMTP packet (3.1.20) with respect to the MMT FEC scheme (3.1.16)

3.1.9

FEC repair flow

data flow carrying repair symbols to protect an FEC source flow (3.1.11)

3.1.10

FEC repair packet

MMTP packet (3.1.20) along with repair FEC payload identifier (3.1.27) to deliver one or more repair symbols (3.1.29) of a repair symbol block (3.1.30)

3.1.11

FEC source flow

flow of MMTP packets (3.1.20) protected by an MMT FEC scheme (3.1.16)

3.1.12

FEC source packet

MMTP packet (3.1.20) protected by an FEC encoding

3.1.13

media fragment unit

MFU

fragment of a media processing unit (3.1.14)

3.1.14

media processing unit

MPU

generic container for independently decodable timed (3.1.35) or non-timed data (3.1.25) that is media codec agnostic

3.1.15

MMT entity

software and/or hardware implementation that is compliant to a profile of MMT

3.1.16

MMT FEC scheme

forward error correction procedure that defines the additional protocol aspects required to use an FEC scheme in MMT

3.1.17

MMT protocol

MMTP

application layer transport protocol for delivering MMTP payload (3.1.22) over IP networks

3.1.18

MMT receiving entity

MMT entity (3.1.15) that receives and consumes media data

3.1.19

MMT sending entity

MMT entity (3.1.15) that sends media data to one or more MMT receiving entities (3.1.18)

3.1.20

MMTP packet

formatted unit of the media data to be delivered using the MMT protocol (3.1.17)

3.1.21

MMTP packet flow

sequence of MMTP packets (3.1.20) with same MMT sending entity (3.1.19) and MMT receiving entity (3.1.18)

3.1.22

MMTP payload

formatted unit of media data to carry Packages (3.1.26) and/or signalling messages using either the MMT protocol (3.1.17) or an Internet application layer transport protocols

3.1.23

MMTP session

single MMTP transport flow (3.1.24) that is used for certain period of time

3.1.24

MMTP transport flow

series of MMTP packet flow (3.1.21) delivered to the same destination

3.1.25

non-timed data

media data that do not have inherent timeline for the decoding and/or presenting of its media content

3.1.26

package

logical collection of media data, delivered using MMT

3.1.27

repair FEC payload ID

FEC payload ID (3.1.8) for repair packets

3.1.28

repair packet block

segmented set of FEC repair flow (3.1.9) which can be used to recover lost source packets

3.1.29

repair symbol

encoding symbol that contains redundancy information for error correction

3.1.30

repair symbol block

set of repair symbols (3.1.29) which can be used to recover lost source symbols (3.1.33)

3.1.31

source FEC payload ID

FEC payload ID (3.1.8) for source packets

3.1.32

source packet block

segmented set of FEC source flow (3.1.11) that is to be protected as a single block

3.1.33

source symbol

unit of data to be encoded by an FEC encoding process

3.1.34

source symbol block

set of source symbols (3.1.33) generated from a single source packet block (3.1.32)

3.1.35

timed data

data that has inherent timeline information for the decoding and/or presentation of its media contents

3.1.36

asset delivery characteristics

ADC

description about required quality of service (QoS) for delivery of assets (3.1.2)

Note 1 to entry: ADC is represented by the parameters agnostic to a specific delivery environment.

3.1.37

network abstraction for media

parameter that is used for an interface between media application layer and underlying network layer