WO2013119023A1 - Structure d'éléments de contenu mmt pour prendre en charge un accès aléatoire à des systèmes qui sont utilisés afin de transmettre des données multimédias codées dans des réseaux hétérogènes, et procédé et appareil adaptés pour créer cette structure - Google Patents

Structure d'éléments de contenu mmt pour prendre en charge un accès aléatoire à des systèmes qui sont utilisés afin de transmettre des données multimédias codées dans des réseaux hétérogènes, et procédé et appareil adaptés pour créer cette structure Download PDF

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WO2013119023A1
WO2013119023A1 PCT/KR2013/000921 KR2013000921W WO2013119023A1 WO 2013119023 A1 WO2013119023 A1 WO 2013119023A1 KR 2013000921 W KR2013000921 W KR 2013000921W WO 2013119023 A1 WO2013119023 A1 WO 2013119023A1
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unit
mmt
random access
media
access information
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PCT/KR2013/000921
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English (en)
Korean (ko)
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배성준
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한국전자통신연구원
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Priority claimed from KR1020130012439A external-priority patent/KR20130090824A/ko
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to US14/375,719 priority Critical patent/US20150020138A1/en
Publication of WO2013119023A1 publication Critical patent/WO2013119023A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/23614—Multiplexing of additional data and video streams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H04N2007/246—Bitstream transport arrangements

Definitions

  • the present invention relates to a method of transmitting media data, and more particularly, to a method of generating a transmission unit of encoded media data in a system for transmitting encoded media data through a heterogeneous IP network.
  • the MPEG-2 system has standardized MPEG-2 Transport Stream (TS) technology as a standard for packetization, synchronization, and multiplexing for transmitting AV (Audio Video) content in a broadcasting network.
  • TS MPEG-2 Transport Stream
  • MPEG-2 TS is inefficient in a new environment in which the network is All IP (Internet Protocol).
  • a new media transmission technology is required in a system for transmitting encoded media data through a heterogeneous IP network in consideration of the new media transmission environment and the expected media transmission environment.
  • An object of the present invention is to provide a structure, a generating method, and a generating apparatus of an empty asset that supports random access to a system for transmitting encoded media data in a heterogeneous network.
  • the present invention provides a method of generating an MMT asset for transmitting media data in a system for transmitting coded media data, the method comprising receiving media data including a media processing unit (MPU). step; Generating random access information; And generating an MMT asset using the media data and the random access information.
  • MPU media processing unit
  • the random access information may include an indicator indicating the number of media processing units included in the MMT asset.
  • the random access information may further include a unit offset indicator indicating a position of the media processing unit.
  • At least one unit offset indicator may be generated to correspond to the media processing unit, respectively.
  • the unit offset indicator may indicate a position of a media processing unit corresponding to a start position of the MMT asset.
  • the random access information may further include a unit size indicator indicating the size of the media processing unit.
  • At least one unit size indicator may be generated to correspond to at least one of the media processing units, respectively, to indicate the size of the corresponding media processing unit.
  • the random access information may further include an indicator indicating whether to possess the random access information.
  • the present invention provides a method for generating an MMT asset for transmitting media data in a system for transmitting coded media data, the media data including a media processing unit (MPU); Receiving step; Generating random access information; And generating a MPEG Media Transport Asset (MMT Asset) using the media data and the random access information.
  • MPU media processing unit
  • a computer-readable recording medium having recorded thereon a program for executing the method of generating an MMT asset on a computer. To provide.
  • the random access information may include an indicator indicating the number of media processing units included in the MMT asset.
  • the random access information may further include a unit offset indicator indicating a position of the media processing unit.
  • At least one unit offset indicator may be generated to correspond to the media processing unit, respectively.
  • the unit offset indicator may indicate a position of a media processing unit corresponding to a start position of the MMT asset.
  • the random access information may further include a unit size indicator indicating the size of the media processing unit.
  • At least one unit size indicator may be generated to correspond to at least one of the media processing units, respectively, to indicate the size of the corresponding media processing unit.
  • the random access information may further include an indicator indicating whether to possess the random access information.
  • the present invention also provides an apparatus for generating MMT assets for transmitting media data in a system for transmitting coded media data, the apparatus comprising a media processing unit (MPU).
  • MPU media processing unit
  • a random access information generator for receiving data and generating random access information
  • an MMT asset generator configured to generate an MMT asset from the media data and the random access information.
  • the random access information may include an indicator indicating the number of media processing units included in the MMT asset.
  • the random access information may further include a unit offset indicator indicating a position of the media processing unit.
  • the unit offset indicator may be generated to correspond to the media processing unit, respectively.
  • the unit offset indicator may store the position of the corresponding media processing unit from the start position of the MMT asset.
  • the random access information may further include a unit size indicator indicating a size of the media processing unit.
  • the unit size indicator may indicate the size of the media processing unit corresponding to each of the at least one media processing unit.
  • the random access information may further include an indicator indicating whether to possess the random access information.
  • the present invention provides a structure of an MMT asset for transmitting media data in a system for transmitting coded media data, comprising: random access information; And a Media Processing Unit (MPU) including a Media Processing Unit (MPU) for storing media data.
  • MPU Media Processing Unit
  • MPU Media Processing Unit
  • the MMT asset structure may further include an indicator indicating the number of the media processing units, and the MMT asset may indicate the number of media processing units included in the MMT asset.
  • the random access information may further include a unit offset indicator indicating a position of the media processing unit.
  • the MMT asset structure may have the unit offset indicators corresponding to the media processing units, respectively.
  • the MMT asset sequentially stores the media processing unit in a memory of the system, and the unit offset indicator may indicate a position where a corresponding media processing unit is located from a start position of the MMT asset.
  • the random access information may further include a unit size indicator indicating the size of the media processing unit to indicate the size of the corresponding media processing unit.
  • the random access information may further include an indicator indicating whether to possess the random access information.
  • the structure, method and apparatus for generating an MMT asset according to the present invention provides a free access to an M-Unit existing in a specific MMT asset by using an indicator indicating the position of the M-Unit and an indicator indicating the size of the M-Unit. Has the effect of
  • FIG. 1 is a conceptual diagram illustrating an MMT hierarchical structure.
  • FIG. 2 is a conceptual diagram illustrating a format of unit information (or data or packet) used for each layer of the MMT hierarchical structure.
  • 3 is a conceptual diagram of an MMT package configuration.
  • FIG. 4 is a block diagram of an MMT asset generating apparatus according to an embodiment of the present invention.
  • FIG. 5 is a flowchart illustrating a method of generating MMT assets according to an embodiment of the present invention.
  • FIG. 6 is a structure of an MMT asset according to an embodiment of the present invention.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • MMT MPEG Media Transport
  • the content component or media component is defined as a media of a single type or a subset of the media of a single type. , Video tracks, movie subtitles, or a video enhancement layer of video.
  • Content is defined as a set of content components, and may be, for example, a movie or a song.
  • a presentation is defined as an operation performed by one or more devices to allow a user to experience one content component or one service (eg, watch a movie).
  • a service is defined as one or more content components that are transmitted for presentation or storage.
  • Service information is defined as metadata describing one service, characteristics and components of the service.
  • An access unit is the smallest data entity that can have time information as an attribute.
  • the AU is not defined.
  • An MMT asset is a logical data entity consisting of at least one MPU with the same MMT asset ID or a specific chunk of data with a format defined by other standards.
  • the MMT asset is the largest data unit to which the same composition information and transmission characteristics apply.
  • MMT Asset Delivery Characteristics is a description related to QoS requirements for delivering MMT assets. MMT-ADC is expressed without knowing the specific transmission environment.
  • MMT Composition Information describes spatial and temporal relationships between MMT assets.
  • MFU Media Fragment Unit
  • AU access unit
  • An MMT package is a collection of logically structured data and includes at least one MMT asset, MMT composition information, MMT asset asset, and descriptive information.
  • the MMT packet is a format of data generated or consumed by the MMT protocol.
  • the MMT payload format is a format for payload of an MMT package or MMT signaling message to be delivered by an MMT protocol or an internet application layer protocol (eg, RTP).
  • the Media Processing Unit is a generic container that is independent of any particular media codec and contains at least one AU and information related to additional transmission and consumption. For non-temporal data, the MPU accepts a portion of data that does not fall within the AU range. MPU is encoded media data that can be processed completely and independently. In this context, processing means encapsulation or packetization into an MMT package for transmission.
  • Non-timed data defines all data elements that are consumed without specifying time.
  • Non-timed data can have a time range within which the data can be executed or started.
  • Timed data defines data elements associated with a particular time to be decoded and presented.
  • Media data refers to data elements including both non-timed data and timed-data.
  • the media unit refers to a container including a media fragment unit (MFU) or a media processing unit (MPU).
  • MFU media fragment unit
  • MPU media processing unit
  • FIG. 1 is a conceptual diagram illustrating an MMT hierarchical structure.
  • the MMT layer includes an encapsulation layer, a delivery layer, and an S layer.
  • the MMT layer operates on a transport layer.
  • the encapsulation layer may be responsible for, for example, packetization, fragmentation, synchronization, multiplexing, and the like of transmitted media.
  • the encapsulation functional area defines the logical structure of the format of the media content, the MMT package, and the data units to be processed by the MMT compliant entity.
  • the MMT package specifies the components that contain the media content and the relationships between them.
  • the format of the data units is defined to encapsulate the encoded media to be stored or transmitted in the payload of the transport protocol and to be easily converted between them.
  • Encapsulation layer (E-layer), as shown in Figure 1, MMT E.1 Layer (MMT E.1 Layer), MMT E.2 Layer (MMT E.2 Layer) and MMT E.3 Layer (MMT) E.3 Layer).
  • MMT E.1 Layer MMT E.1 Layer
  • MMT E.2 Layer MMT E.2 Layer
  • MMT E.3 Layer MMT E.3 Layer
  • the E.3 layer encapsulates a Media Fragment Unit (MFU) provided from the Media Codec (A) layer to create a Media Processing Unit (MPU).
  • MFU Media Fragment Unit
  • A Media Codec
  • MPU Media Processing Unit
  • Encoded media data from the upper layer is encapsulated in MFU.
  • the type and value of the encoded media can be abstracted to allow the MFU to be generally used in a particular codec technology. This allows the lower layer to process the MFU without access to the encapsulated encoded media.
  • the lower layer retrieves the required encoded media data from the network or storage buffer and sends it to the media decoder.
  • the MFU has enough information media subunits to perform this operation.
  • the MFU may have a format, independent of any particular codec, that can carry data units that can be consumed independently in the media decoder.
  • the MFU can be, for example, a picture or slice of the video.
  • MFUs One or a group of multiple MFUs that can be independently transmitted and decoded create an MPU.
  • Non-temporal media that are independently transportable and executable also create an MPU.
  • MPUs describe internal structures such as the arrangement and pattern of MFUs that allow for quick access and partial consumption of MFUs.
  • the E.2 layer encapsulates the MPUs created in the E.3 layer to generate MMT assets.
  • An MMT asset is a data entity consisting of one or more MPUs from a single data source, and is a data unit in which composition information (CI) and transport characteristics (TC) are defined. Multiplexed by load format and transmitted by MMT protocol. MMT assets can correspond to packetized elementary streams (PES), for example video, audio, program information, MPEG-U widgets, JPEG images, MPEG 4 file format, M2TS (MPEG transport stream), etc.
  • PES packetized elementary streams
  • the E.1 layer creates an MMT package by encapsulating the MMT asset generated in the E.2 layer.
  • the MMT asset is packaged with MMT composition information (MMT-CI) for later response of the same user experience together or separately with other functional areas—transmission area and signal area.
  • MMT-CI MMT composition information
  • the MMT package is also packaged with a transmission characteristic that selects an appropriate transmission method for each MMT asset to satisfy the haptic quality of the MMT asset.
  • the MMT package may be composed of one or more MMT assets together with additional information such as composition information and transport characteristics.
  • Composition information includes information about a relationship between MMT assets, and when one content consists of a plurality of MMT packages, it indicates a relationship between a plurality of MMT packages. It may further include information.
  • the transport characteristics may include transmission characteristic information necessary for determining a delivery condition of an MMT asset or an MMT packet, and may include, for example, a traffic description parameter and a QoS descriptor. ) May be included.
  • the MMT package may correspond to a program of MPEG-2 TS.
  • the delivery layer may perform, for example, network flow multiplexing, network packetization, and QoS control of media transmitted through a network.
  • the delivery functional area defines the payload format and application layer protocol.
  • the application layer protocol in the present invention provides enhanced features for the delivery of MMT packages as compared to conventional application layer protocols for the transmission of multimedia including multiplexing.
  • the payload format is defined to carry coded media data regardless of the media type or encoding method.
  • the transport layer (D-layer), as shown in Figure 1, MMT D.1 Layer (MMT D.1 Layer), MMT D.2 Layer (MMT D.2 Layer) and MMT D.3 Layer (MMT) D.3 Layer).
  • the D.1 layer receives the MMT package generated in the E.1 layer and generates an MMT payload format.
  • the MMT payload format is a payload format for carrying MMT assets and for transmitting information for consumption by the MMT application protocol or other existing application transport protocol such as RTP.
  • the MMT payload may include a fragment of the MFU along with information such as AL-FEC.
  • the D.2 layer receives the MMT payload format generated in the D.1 layer and generates an MMT transport packet or an MMT packet.
  • the MMT transport packet or MMT packet is a data format used in an application transport protocol for MMT.
  • D.3 layer supports QoS by providing the function of exchanging information between layers by cross-layer design.
  • the D.3 layer may perform QoS control using QoS parameters of the MAC / PHY layer.
  • the S layer performs a signaling function. For example, signaling functions for session initialization / control / management of transmitted media, server-based and / or client-based trick modes, service discovery, synchronization, etc. Can be done.
  • the signaling functional area defines the format of the message that manages the delivery and consumption of the MMT package.
  • the message for consumption management is used to transmit the structure of the MMT package, and the message for delivery management is used to transmit the structure of the payload format and the configuration of the protocol.
  • the S layer may include an MMT S.1 layer and an MMT S.2 layer.
  • S.1 layer includes service discovery, media session initialization / termination of media, media session presentation / control of media, delivery (D) layer and encapsulation (E).
  • the interface function with the layer can be performed.
  • the S.1 layer may define the format of control messages between applications for media presentation session management.
  • the S.2 layer is responsible for flow control, delivery session management, delivery session monitoring, error control, and hybrid network synchronization control. It is possible to define the format of the control message exchanged between delivery end-points of the D-layer.
  • the S.2 layer supports delivery session establishment and release, delivery session monitoring, flow control, error control, resource scheduling for established delivery sessions, and synchronization in a complex delivery environment to support the behavior of the delivery layer.
  • Signaling for adaptive delivery, and signaling for adaptive delivery. Required signaling may be provided between a sender and a receiver. That is, the S.2 layer may provide signaling required between the sender and the receiver in order to support the operation of the transport layer as described above.
  • the S.2 layer may be responsible for interfacing with the transport layer and the encapsulation layer.
  • FIG. 2 illustrates a format of unit information (or data or packet) used for each layer of the MMT hierarchical structure of FIG. 1.
  • the media fragment unit (MFU) 130 may include coded media fragment data 132 and a media fragment unit header (MFUH) 134.
  • the media fragment unit 130 has a general container format independent of a specific codec and may carry the smallest data unit that can be consumed independently in a media decoder.
  • the MFUH 134 may include additional information such as media characteristics-for example, loss-tolerance.
  • MFU) 130 may be, for example, a picture or slice of a video.
  • the Media Fragment Unit may define a format that encapsulates a portion of the AU in the transport layer to perform adaptive transmission in the range of the MFU.
  • the MFU may be used to transmit certain types of encoded media so that portions of the AU can be independently decoded or discarded.
  • the MFU has an identifier for distinguishing one MFU from other MFUs and may have general relationship information between MFUs in a single AU.
  • the dependency relationship between MFUs in a single AU is described, and the relative priority of the MFUs can be described as part of such information.
  • the information can be used to handle the transmission at the lower transport layer.
  • the transport layer may omit the transmission of MFUs that may be discarded to support QoS transmission in insufficient bandwidth. Detailed description of the MFU structure will be given later.
  • the MPU is a collection of media fragment units including a plurality of media fragment units 130.
  • the MPU may have a general container format independent of a specific codec and may include media data equivalent to an access unit.
  • the MPU may have a timed data unit or a non-timed data unit.
  • MPU is data that is independently and completely processed by an entity following the MMT, and the processing may include encapsulation and packetization.
  • An MPU may consist of at least one MFU or have a portion of data having a format defined by another standard.
  • a single MPU may accommodate the integral number or non-time data of at least one AU.
  • an AU may be delivered from at least one MFU, but one AU may not be divided into multiple MPUs.
  • one MPU receives a portion of non-time data that has been independently and completely processed by an entity that complies with the MMT.
  • An MPU can be uniquely identified within an MMT package with a sequence number and an associated asset ID that distinguishes it from other MPUs.
  • the MPU may have at least one random access point.
  • the first byte of the MPU payload can always start with a random access point. In time data, this fact means that the decoding order of the first MFU in the MPU payload is always zero.
  • the presentation period and decoding order of each AU can be sent to inform the presentation time.
  • the MPU does not have its initial presentation time, and the presentation time of the first AU of one MPU may be described in the composition information.
  • the composition information may specify the first presentation time of the MPU. Details will be described later.
  • the MMT asset 150 is a collection of MPUs composed of a plurality of MPUs.
  • the MMT asset 150 is a data entity composed of multiple MPUs (timed or non-timed data) from a single data source, and the MMT asset information 152 is an asset packaging metadata (Asset). Additional information such as packaging metadata) and data type.
  • MMT asset 150 may include, for example, video, audio, program information, MPEG-U widgets, JPEG images, MPEG 4 FF (File Format), packetized elementary streams (PES), and MPEG transport (M2TS). streams).
  • MMT Assets are logical data entities that contain encoded media data.
  • the MMT asset may be composed of an MMT asset header and encoded media data.
  • the encoded media data may be a collective reference group of MPUs with the same MMT asset ID.
  • Types of data that can be individually consumed by an entity directly connected to the MMT client may be considered as separate MMT assets. Examples of data types that can be considered as individual MMT assets include MPEG-2 TS, PES, MP4 files, MPEG-U Widget Package, and JPEG files.
  • the encoded media of the MMT asset may be time data or non-time data.
  • Temporal data is audiovisual media data that requires synchronized decoding and presentation of specific data at specified times.
  • Non-timed data is data of a data type that can be decoded and provided at any time in accordance with the provision of a service or user interaction.
  • a service provider may create a multimedia service by integrating MMT assets and putting MMT assets on a space-time axis.
  • the MMT package 160 is a collection of MMT assets including one or more MMT assets 150.
  • MMT assets in an MMT package may be multiplexed or concatenated.
  • the MMT package is a container format for MMT asset and configuration information.
  • the MMT package provides a repository of MMT assets and configuration information for the MMT program.
  • the MMT program provider generates configuration information by encapsulating the encoded data into MMT assets and describing the temporal and spatial layout of the MMT assets and their transmission characteristics.
  • MU and MMT assets can be sent directly in the D.1 payload format.
  • the configuration information may be sent by the C.1 Presentation Session Management message.
  • MMT program providers and clients that allow relaying or future reuse of MMT programs store them in MMT package format.
  • the MMT program provider determines which transmission path (eg, broadcast or broadband) the MMT asset will be provided to the client.
  • Configuration information in the MMT package is transmitted in a C.1 presentation session management message along with transmission related information.
  • the client receives the C.1 Presentation Session Management message to know which MMT programs are available and how to receive the MMT assets for the corresponding MMT program.
  • the MMT package can also be transmitted by the D.1 payload format.
  • the MMT package is packetized and delivered in D.1 payload format.
  • the client receives the packetized MMT package and configures all or part of it, where it consumes the MMT program.
  • the package information 165 of the MMT package 160 may include configuration information.
  • the configuration information may include additional information such as a list of MMT assets, package identification information, composition information 162, and transport characteristics 164.
  • Composition information 162 includes information about a relationship between MMT assets 150.
  • composition information 162 may further include information for indicating a relationship between a plurality of MMT packages when one content includes a plurality of MMT packages.
  • Composition information 162 may include information about temporal, spatial and adaptive relations in an MMT package.
  • Composition Information in the MMT provides information about the spatial and temporal relationships between MMT assets in the MMT package.
  • MMT-CI is an explanatory language that extends HTML5 to provide such information.
  • HTML5 is designed to describe page-based presentations of text-based content
  • MMT-CI mainly represents spatial relationships between sources.
  • information related to MMT assets in an MMT package such as presentation resources, time information for determining the order in which MMT assets are sent and consumed, and various MMT assets are consumed in HTML5. It can be extended to have additional properties of media elements. Detailed description will be described later.
  • the transport characteristics information 164 may include information on transmission characteristics and may provide information necessary for determining a delivery condition of each MMT asset (or MMT packet).
  • the transmission characteristic information may include a traffic description parameter and a QoS descriptor.
  • the traffic description parameter may include bitrate information, priority information, or the like for the media fragment unit (MFU) 130 or the MPU.
  • the bitrate information is for example information about whether the MMT asset is Variable BitRate (VBR) or Constant BitRate (CBR), guaranteed bitrate for the Media Fragment Unit (MFU) (or MPU). ), The maximum bit rate for the media fragment unit (MFU) (or MPU).
  • the traffic description parameter may be used for resource reservation between servers, clients, and other components on a delivery path, for example, maximum size information of a media fragment unit (MFU) (or MPU) in an MMT asset. It may include.
  • the traffic description parameter may be updated periodically or aperiodically.
  • the QoS descriptor includes information for QoS control and may include, for example, delay information and loss information.
  • the loss information may include, for example, a loss indicator of whether delivery loss of the MMT asset is allowed or not.
  • a loss indicator of '1' may indicate 'lossless', and a '0' indicates 'lossy'.
  • the delay information may include a delay indicator used to distinguish the sensitivity of the transmission delay of the MMT asset.
  • the delay indicator may indicate whether the type of the MMT asset is conversation, interactive, real time, and non-realtime.
  • One content may consist of one MMT package.
  • one content may consist of a plurality of MMT packages.
  • composition information or composition information indicating temporal, spatial, and adaptive relations between the plurality of MMT packages may exist inside one MMT package or outside the MMT package.
  • some of the content components are transmitted through a broadcast network and the rest of the content components are transmitted through a broadband network.
  • a broadband network For example, in the case of a plurality of audio visual streams constituting one multi-view service, one stream may be transmitted to a broadcasting network and the other stream may be transmitted to a broadband network, and each AV stream may be multiplexed and transmitted to a client terminal. Can be individually received and stored.
  • application software such as a widget is transmitted to a broadband network and an AV stream (AV program) is transmitted to an existing broadcasting network.
  • the entire plurality of AV streams may be a single MMT package, and in this case, one of the plurality of streams may be stored in only one client terminal.
  • the storage content becomes part of the MMT package, and the client terminal needs to rewrite the composition information or the configuration information, and the rewritten content becomes a new MMT package independent of the server. .
  • each AV stream may be one MMT package, and in this case, a plurality of MMT packages constitute one content, and storage Storage is recorded in units of MMT packages and requires composition information or configuration information indicating a relationship between MMT packages.
  • composition information or configuration information included in one MMT package may refer to an MMT asset in another MMT package, and may also refer to the outside of an MMT package that refers to the MMT package in an out-band situation. I can express it.
  • the MMT package 160 is controlled through a control (C) layer.
  • the MMT control message may include an information table for service discovery.
  • the server dividing the multimedia content into a plurality of segments allocates URL information to a plurality of segments divided into a predetermined number, and stores URL information about each segment in a media information file and transmits the URL information to the client.
  • the media information file may be called various names such as “media presentation description (MPD)” or “manifest file” according to a standardization organization that standardizes HTTP streaming.
  • MPD media presentation description
  • MPD media presentation description
  • the cross-layer interface is described below.
  • the Cross Layer Interface provides a means for supporting QoS in a single entity by exchanging QoS related information between lower layers including the application layer and the MAC / PHY layer.
  • the lower layer provides bottom-up QoS information such as network channel state, while the application layer provides information related to media characteristics as top-down QoS information.
  • the cross layer interface provides an integrated interface between the application layer and various network layers including IEE802.11 WiFi, IEEE 802.16 WiMAX, 3G, 4G LTE, etc.
  • Common network parameters of popular network standards are extracted as NAM parameters for static and dynamic QoS control of real-time media applications over various networks.
  • the NAM parameter may include a BER value that is a bit error rate. BER can be measured at the PHY or MAC layer.
  • the NAM also provides the identification of the underlying network, possible bit rates, buffer conditions, peak bit rates, service unit sizes, and service data unit loss rates.
  • the first way is to provide an absolute value.
  • the second is to provide relative values.
  • the second method can be used to update the NAM while connected.
  • the application layer provides top-down QoS information related to media characteristics for lower layers.
  • top-down information such as MMT asset level information and packet level information.
  • MMT asset information is used for capacity exchange and / or resource (re) allocation at lower layers.
  • Packet level top down information is recorded in the appropriate field of every packet for the lower layer to identify the QoS level it supports.
  • the lower layer provides bottom-up QoS information to the application layer.
  • the lower layer provides information regarding network conditions that change over time, enabling faster and more accurate QoS control at the application layer.
  • Bottom-up information is expressed in an abstracted form to support heterogeneous network environments. These parameters are measured at the lower layer and read at the application layer periodically or at the request of the MMT application.
  • the MMT asset is an MPU in order to support free access to a media processing unit (Media Processing Unit; MPU) or a media unit (Media Unit; M-Unit) present in the MMT asset.
  • MPU Media Processing Unit
  • M-Unit media unit
  • the index is located in the header of the MMT asset so that the device using the media data can access any MPU or M-Unit in the MMT asset in one transaction through the index.
  • the following description of the M-Unit can be applied to the media processing unit so that any media processing unit in the MMT asset can be accessed in one transaction.
  • the description of the media processing unit may also be applied to the M-Unit.
  • FIG. 4 is a block diagram of an MMT asset generating apparatus according to an embodiment of the present invention.
  • the MMT asset generating apparatus 400 receives the media data and generates an MMT asset.
  • the MMT asset generating apparatus 400 may include an M-Unit generator 410, a random access information generator 420, and a packaging unit 430.
  • the M-Unit generation unit 410 may receive the media data and divide the media data into M-Units having a predetermined size. The sizes of the M-Units may be different.
  • the M-Unit generator 410 may calculate the size of the generated M-Unit and the number of generated M-Units.
  • the M-Unit generation unit 410 is an optional configuration that can be omitted if the MMT asset generation device 400 receives the already divided M-Unit.
  • the random access information generator 420 receives data from the M-Unit generator 410 and generates random access information.
  • the random access information generator 420 may receive and use at least one of an M-Unit, a size of the generated M-Unit, and the number of generated M-Units from the M-Unit generator 410.
  • the random access information generating unit 420 does not have the M-Unit generating unit 410 and receives the M-Unit directly or when there is no one of the information, at least one of the size of the M-Unit and the number of M-Units You can create your own.
  • the random access information may include an indicator indicating whether the MMT asset has a randomly accessible information portion or a random access point indicator indicating whether the M-Unit is a randomly accessible M-Unit.
  • the packaging unit 430 receives the random access information and the M-Unit from the random access information generation unit 420 and packages the MMT asset.
  • the packaging unit 430 may package the MMT asset by receiving at least one of a data unit, a size of the generated M-Unit, a number of generated M-Units, and random access information from the random access information generator.
  • the packaging unit 430 may directly receive and use an M-Unit.
  • the packaging unit 430 may directly receive at least one of the M-Unit, the size of the generated M-Unit, and the number of generated M-Units from the M-Unit generator 410.
  • At least two of the above-described M-Unit generation unit 410, random access information generation unit 420, and packaging unit may be merged into one module and used.
  • FIG. 5 is a flowchart illustrating a method of generating MMT assets according to an embodiment of the present invention.
  • the MMT asset generating apparatus 400 receives media data (S100). Next, M-Unit is generated (S200).
  • the M-Unit generator 410 may classify the media data into predetermined units to generate the MMT asset by receiving the media data.
  • Media data can be encapsulated in M-Units and packaged in MMT assets.
  • the M-Unit generator 410 may label the encapsulated M-Units while encapsulating the media data into M-Units, and calculate the number of M-Units and the size of each M-Unit.
  • the M-Unit generator 410 transmits at least one of the generated M-Unit, the M-Unit labeling information, the calculated number and size of the M-Unit, and the random access information generator 420. If the M-Unit is directly received, the M-Unit creation step may be omitted.
  • random access information is generated (S300).
  • the random access information generator 420 generates random access information with reference to the media data, or generates random access information using the M-Unit information received from the M-Unit generator 410.
  • the random access information is information necessary for random access.
  • the random access information may include a random access flag indicating whether the M-Unit has a random access point.
  • the random access information may be delivered to the packaging unit corresponding to the label of the M-Unit.
  • the random access information generator 420 may transfer the received information and the random access information to the package unit.
  • the package unit 430 may package and generate an MMT asset including at least one of media data or M-Unit, M-Unit labeling information, M-Unit number, M-Unit size, and random access information. .
  • An MMT asset according to an embodiment of the present invention may associate and store at least two of a label of an M-Unit, an M-Unit, location information of an M-Unit, and random access information of an M-Unit. Each piece of information can be stored in association with the M-Unit's label. Alternatively, the location information of the M-Unit and the M-Unit are stored sequentially and the random access information of the M-Unit is sequentially used to associate the random access information with the M-Unit without explicitly using the label of the M-Unit. Can be stored.
  • the MMT asset uses a set of at least one M-Unit starting with an M-Unit having a random access point without packaging location information and random access information of all M-Units. Therefore, the location information and the random access information of the M-Unit for the M-Unit that does not have a random access point may be omitted.
  • a structure of an MMT asset including only an M-Unit having a random access point may be generated. It generates random access information before encapsulating the media data and uses the random access information in the step of encapsulating the media data to merge the M-Unit without the random access point with the M-Unit with the random access point to perform random access. It can also be provided by creating only M-Units with points. In addition, an indicator indicating the number of M-Units and the size of the M-Unit may be used separately.
  • 6 is a structure of MMT asset (mmt_asset) according to an embodiment of the present invention. 6 is a syntax of random access information included in an MMT asset according to an embodiment of the present invention.
  • MMT assets can be divided into header fields and payloads.
  • the header field may include random access information and data necessary for using the MMT asset.
  • 6 illustrates a structure of an MMT asset when all M-Units have random access points. Header fields of the MMT asset include flag_unit_index, no_of_unit, unit_byte_offset, and Unit_byte_size.
  • flag_unit_index indicates whether the MMT asset has a random access information portion for the M-Unit.
  • the header of mmt_asset has an information part for random access index for M-Unit.
  • the information for the random access index includes no_of_unit, unit_byte_offset, and Unit_byte_size.
  • no_of_unit means the number of all M_Units included in the MMT asset.
  • unit_byte_offset represents the byte offset at which the corresponding M_Unit is located.
  • unit_byte_offset may mean a byte offset in which the corresponding M_Unit is located from the byte position of the starting point of the M_Unit.
  • Unit_byte_size means the byte size of the corresponding M_Unit.
  • the flag_unit_index indicator has a value of 1 after the flag_unit_index indicator
  • the no_of_unit indicator may be arranged, and then a number of unit_byte_offset and Unit_byte_size indicators may be arranged according to the value of the no_of_unit indicator.
  • an indicator indicating other information may be arranged in the head field.
  • flag_unit_index indicator has a value of 0, no_of_unit, unit_byte_offset, and Unit_byte_size are not arranged, and other indicators may be arranged in the header field.
  • the MMT asset When the description of the header field of the MMT asset is completed, the MMT asset has a payload.
  • the payload may be arranged by repeating M_Unit by the value of no_of_unit.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

La présente invention se rapporte à une structure d'éléments de contenu MMT, qui est adaptée pour fournir un accès libre à une unité M existant dans un élément de contenu MMT spécifique, au moyen d'un indicateur qui indique la position de l'unité M et d'un indicateur qui indique la taille de l'unité M dans une configuration d'éléments de contenu MMT. L'invention se rapporte d'autre part à un procédé et à un appareil adaptés pour créer cette structure.
PCT/KR2013/000921 2012-02-06 2013-02-05 Structure d'éléments de contenu mmt pour prendre en charge un accès aléatoire à des systèmes qui sont utilisés afin de transmettre des données multimédias codées dans des réseaux hétérogènes, et procédé et appareil adaptés pour créer cette structure WO2013119023A1 (fr)

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KR10-2012-0011985 2012-02-06
KR20120011985 2012-02-06
KR1020130012439A KR20130090824A (ko) 2012-02-06 2013-02-04 이종망 네트워크에서 부호화된 미디어 데이터를 전송하는 시스템에 랜덤 액세스를 지원하는 엠엠티 애셋의 구조, 생성 방법 및 생성 장치
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WO2017142347A1 (fr) * 2016-02-17 2017-08-24 삼성전자 주식회사 Procédé et dispositif permettant de fournir des informations relatives à un contenu d'un service multimédia
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