WO2012173391A2 - Procédé de transmission de données multimédia par paquets comprenant un en-tête dans lequel le surdébit est réduit au minimum - Google Patents

Procédé de transmission de données multimédia par paquets comprenant un en-tête dans lequel le surdébit est réduit au minimum Download PDF

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Publication number
WO2012173391A2
WO2012173391A2 PCT/KR2012/004670 KR2012004670W WO2012173391A2 WO 2012173391 A2 WO2012173391 A2 WO 2012173391A2 KR 2012004670 W KR2012004670 W KR 2012004670W WO 2012173391 A2 WO2012173391 A2 WO 2012173391A2
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WIPO (PCT)
Prior art keywords
header
mmt
media data
layer
packet
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PCT/KR2012/004670
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English (en)
Korean (ko)
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WO2012173391A3 (fr
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배성준
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한국전자통신연구원
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Priority to US14/126,207 priority Critical patent/US9386125B2/en
Priority claimed from KR1020120063213A external-priority patent/KR101857416B1/ko
Publication of WO2012173391A2 publication Critical patent/WO2012173391A2/fr
Publication of WO2012173391A3 publication Critical patent/WO2012173391A3/fr
Priority to US15/175,953 priority patent/US9473378B1/en

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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
    • H04N21/238—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
    • H04N21/2381—Adapting the multiplex stream to a specific network, e.g. an Internet Protocol [IP] network

Definitions

  • the present invention relates to a method of transmitting media data, and more particularly, to a packet-based method of transmitting media data having a header that minimizes transmission overhead.
  • the MPEG-2 TS when the MPEG-2 TS is developed, the multimedia transmission environment and today's multimedia transmission environment are undergoing major changes.
  • the MPEG-2 TS standard was developed in consideration of transmitting multimedia data through an ATM network at the time of enactment, but it is hard to find a case which is used for this purpose today.
  • the requirements such as multimedia transmission using the Internet were not considered at the time of enactment of the MPEG-2 TS standard, there are elements that are not efficient for multimedia transmission over the recent Internet. Therefore, in the MPEG, the establishment of the MMT (MPEG Multimedia Transport Layer), which is a new multimedia transmission standard considering the multimedia service on the Internet that is suitable for the changing multimedia environment, is recognized as a very important problem.
  • MMT MPEG Multimedia Transport Layer
  • MPEG2-TS MPEG2-TS standard
  • MPEG MMT is being standardized as a new transmission technology standard.
  • Encapsulation layer and delivery layer exist in MPEG media transmission, and the encapsulation layer includes (1) Media Fragment Unit (MFU) and (2) M-Unit. (3) MMT asset, (4) MMT package, four parts, the transport layer is (1) MMT Payload format and (2) MMT transport packet It is divided into two parts.
  • the present invention discloses an MMT transmission overhead structure considering transmission overhead minimization when transmitting media through MMT.
  • Transmit overhead is intended to be designed within a range that is not significantly large (or smaller) in a reasonable sense compared to existing delivery frameworks currently in use such as M2TS, RTP-based. can do. At least for the header fields that provide the same operation and / or precision as in existing frameworks, the newly proposed method should have the same or smaller header field size.
  • the headers for these six items are simply superimposed / added to each header sequentially to form a packet.
  • this packet may include unnecessary information in addition to the information necessary for the actual packet transmission, which may cause considerable overhead. Therefore, it is necessary to newly define only the overhead required for streaming.
  • an object of the present invention is to packetize and transmit media data, but all header fields necessary for operations in which the media fragment unit header and the M-unit header share one format and are not supported as an RTP header are included in the MMT payload format. By providing the location, it is to provide a packet-based media data transmission method having a header with a minimum of overhead.
  • Another object of the present invention is to packetize and transmit media data, but the header fields required for operations in which the media fragment unit header and the M-unit header share one format and are not supported as an RTP header are all MMT payload format. In order to provide an interface for packet-based media data transmission having a header with minimal overhead.
  • a packet-based media data transmission method having a header with minimal overhead is a media fragment unit (MFU) header and M-unit (M-unit) Encapsulating media data such that the header shares one format; Passing the encapsulated media data from one entity to another entity such that the MMT payload format includes a header field for operations not supported by the RTP header; And controlling the delivery of the media data.
  • MFU media fragment unit
  • M-unit M-unit
  • the media fragment unit header and the M-unit header share one format to provide a separate format.
  • the encoder since all header fields necessary for operations not supported by the RTP header are located in the MMT payload format, both of a case of transmitting through RTP and a case of transmitting through MMTP may operate. Therefore, it is possible to efficiently transmit the media data by minimizing the transmission overhead.
  • FIG. 1 is a conceptual diagram illustrating an MMT hierarchical structure.
  • 3 is a diagram illustrating a structure of an M-Unit header for an encoder.
  • FIG. 4 is a diagram illustrating a structure of an M-Unit header for a system.
  • FIG. 5 is a diagram illustrating an MMT payload format structure.
  • 6 is a diagram for explaining an MMT packet header structure.
  • FIG. 7 is a diagram illustrating a process of packetizing media data output from an encoder for transmission.
  • FIG. 8 is a flowchart of a packet-based media data transmission method having a header with minimized overhead 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.
  • FIG. 1 is a conceptual diagram illustrating an MMT hierarchical structure.
  • the MMT layer includes an encapsulation layer, a delivery layer, and a functional area of a control 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.
  • 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 an M-Unit.
  • MFU Media Fragment Unit
  • 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.
  • the M-unit may consist of one or a plurality of MFUs and may have a format, independent of a particular codec, that may carry one or a plurality of access units.
  • the E.2 layer encapsulates the M-units created in the E.3 layer to generate an MMT asset.
  • An MMT asset is a data entity composed of one or a plurality of M-units from a single data source and is a data unit in which composition information and transport characteristics are defined.
  • 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 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 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 ability to exchange information between layers by cross-layer design.
  • the D.3 layer may perform QoS control using QoS parameters of the MAC / PHY layer.
  • the control layer is, for example, session initialization / control / management of transmitted media, server-based and / or client-based trick modes, service discovery, synchronization ) Functions can be performed.
  • a control layer may be configured of an MMT C.1 layer and an MMT C.2 layer.
  • C.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 C.1 layer may define the format of control messages between applications for media presentation session management.
  • Layer C.2 provides delivery of 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.
  • Layer C.2 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 C.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 C.2 layer may be responsible for interfacing with the transport layer and the encapsulation layer.
  • An interface for packet-based media data transmission encapsulates media data such that a Media Fragment Unit (MFU) header and an M-unit header share one format.
  • an interface for transmitting the media data and a method of transmitting the media data will be described in detail.
  • the overhead structure used for the delivery time (for an application performing network streaming) and the encapsulation time (for an application archiving to a storage device as a file) need to be defined separately.
  • the overhead structure at the time of delivery (network streaming) is described.
  • the present application provides additional guidelines as to the overhead required for delivery.
  • a header step required for packetizing and transmitting media data generated from an encoder may be configured as a two-step structure of (1) an AU level header and (2) a packet level header.
  • MFU Media Fragment Unit
  • MU M-Uit
  • the header fields required for operations not supported by the existing RTP header in the sublayer of the MMT payload format present in the transport layer and in the sublayer of the MMT transport packet are all MMT Payload format. , MMTPL).
  • the header after the media unit created by the encoder has a two-level structure of (1) AU level header and (2) packet level header.
  • the information that needs to be transmitted from one side to the other through packet transmission can be divided into three categories.
  • session level information e.g., session configuration information such as the number of media belonging to the session, codec type, screen configuration information, etc.
  • AU-level information PTS-Presentation Timestamp: presentation timestamp, Information to be attached at AU level
  • packet level information accommodating multiple units in one packet: aggregation, splitting into multiple packets of one unit: fragmentation, packet level multiplexing, packet error processing, etc.
  • the session level information may be sent out-of-band through a separate transport channel and does not need to include this information in the packet header. Therefore, in the present invention, it is determined that two layers having an AU level header and a packet level header with respect to the header at the time of transmission are sufficient and optimal.
  • the AU level header may include all the fields required for streaming in the sublayers included in the encapsulation layer, and may not explicitly classify each sublayer. However, the AU level header may have only one field discrimination depending on whether the field is filled by the encoder or the field is filled by the system.
  • MFU Media Fragment Unit
  • MU M-Unit
  • the encoder may need additional work to distinguish which header should be written. For example, in the case of an encoder that outputs in units of fragments, a function that needs to additionally check the AU start and end points of its output stream in order to attach a MU header at the AU level while outputting fragments. This is necessary. Given the current situation in which there are a large number of codecs and corresponding encoders, it is unreasonable to impose this distinction on all encoders.
  • operations not supported by the existing RTP header may be located in the MMT payload format (MMTPL).
  • MMTPL MMT payload format
  • the role of the MMTPL is a common layer in which various media using the newly defined MMT standard can be commonly used in existing application standards such as RTP.
  • existing application standards such as RTP.
  • a new function not supported by the existing protocol such as RTP must be placed in the MMT payload format. Both the case of transmission through and the case of transmission through MMTP can operate.
  • the header of the two level layers may include an M-Unit header as an AU level header, and may include an MMT payload header and an MMT packet header as a packet level header.
  • the M-Unit header is an AU level header and one M-Unit has one M-Unit header.
  • the M-Unit header can subsequently be divided into two parts: the M-Unit header (MUH-E) for the encoder and the M-Unit header (MUH-S) for the system.
  • the MUH-E is intended to be filled by fields by the encoder and contains the information necessary to enable the encoder to transmit more efficiently to the system.
  • MUH-S aims to fill the fields by the system and includes information that the system must process from the point of view of the MU (AU).
  • the MUH-E basically consists of a common field and can be extended to have a fragment field as an option.
  • the common field is a basic field and includes general information related to the current MU, and is commonly used by both an encoder outputting in AU units and an encoder outputting in fragments.
  • the fragment field is a field that can be expanded to include information related to fragmentation, and is used only when the current unit includes a fragment of the AU. Therefore, the fragment field may be used only in the case of an encoder outputting in units of fragments.
  • 3 is a diagram illustrating a structure of an M-Unit header for an encoder.
  • the MUH-E is filled by the encoder and may include information that the encoder can provide to the system to improve the transmission quality of the transmission system.
  • Anchor Flag-1 When Anchor Flag-1 is displayed, it means that the starting point of this unit includes an anchor point.
  • L Lossless-1 indicates that data included in this unit should be transmitted so as not to experience packet loss.
  • F Fragmented-1
  • the data included in this unit includes the MFU as a fragment of the MU. It must have an additional Fragment Field after this header field.
  • this unit contains the first of the fragments split within one MU.
  • the two bits S and E may be combined and used as one field of start_end_indicator as follows.
  • each bit combination is the same as S and E, and may be used for AU as well as MU.
  • Frg.Order Fragment Order-It indicates how many fragments this unit is among fragments divided in one MU.
  • FIG. 4 is a diagram illustrating a structure of an M-Unit header for a system.
  • the MUH-S is filled in by the system and contains the information provided by the system with respect to the current MU (AU).
  • PTS Presentation Timestamp-Time information for screen display of current M-Unit
  • FIG. 5 is a diagram illustrating an MMT payload format structure.
  • the MMT packet level may have two levels of headers. One is an MMTPL (MMT Payload Format) header and the other is an MMT Packet (MMTP Packet) header.
  • MMTPL MMT Payload Format
  • MMTP Packet MMT Packet
  • One MMT packet includes one MMT payload format unit.
  • header fields corresponding to the newly designed functions must be placed in the MMT payload format header. It inherits the functionality that RTP supports but can only accommodate the minimum functionality that MMTPL cannot support.
  • Anchor-1 When Anchor-1 is indicated, it indicates that the beginning of this packet includes the Anchor point of the media like the random access point.
  • M Multiple unit-1
  • the Multiple MU may be used as a Multiple Unit that accommodates other units besides the MU and may be used as a flag_multiple_unit.
  • Substream ID-Can serve as an identifier for multiplexing different types of assets or packages on a packet basis. It plays a role similar to PID of M2TS. The actual assignment of this ID value is determined dynamically when the session is set up, and can either be mapped in-band or separate session setup protocols sent out-of-band. It is available.
  • 6 is a diagram for explaining an MMT packet header structure.
  • FIG. 7 is a diagram illustrating a process of packetizing media data output from an encoder for transmission.
  • the encoder has an encoder that outputs in AU unit and an encoder that outputs in MFU unit, and both encoders fill the common field of MUH-E.
  • an additional fragment field of MUH-E Fill in the Fragment Field. (Fragment MU Case in Figure 7)
  • the streaming system that receives this can form a stream of MUs (or MFUs) to which MUH-S is attached followed by MUH-E to create an MMT asset stream.
  • MFUs or MFUs
  • Each MMT asset stream adds “Asset Info” to form a standalone MMT Asset Asset information is required for the current asset or needs to be transmitted during transmission. May contain missing information.
  • Independent MMT assets for each codec or media type configured as described above form an MMT package together with composition information and transmission characteristic.
  • the screen configuration information may be sent through an MMT packet of a signal type or another out-of-band transmission channel.
  • the transmission characteristic information for each MMT asset may be stored in asset information (Asset Info) or may be stored as a separate field in the MMT package.
  • the system can extract the MU (or MFU) from independent assets in the MMT package and select the appropriate packetization method (merge or split) according to the MTU packet size currently available in the network.
  • the system adds an MMTPL header (PLH in FIG. 7) and an MMTP header to the packet, and then transmits it to the lower layer UDP or TCP protocol.
  • the system may select an appropriate protocol according to transmission characteristics of each asset (UDP or TCP) or a policy for error processing such as an application layer FEC (FEC).
  • FEC application layer FEC
  • the system can attach the RTP header after the MMTPL header and send it.
  • FIG. 8 is a flowchart illustrating a packet-based media data transmission method having a header with minimized overhead according to an embodiment of the present invention.
  • a packet-based media data transmission method having a header with minimal overhead first includes a Media Fragment Unit (MFU) header and an M-unit (M-M).
  • -unit encapsulates the media data so that the header shares one format (S810). That is, the Media Fragment Unit (MFU) header and the M-Unit (MU) header share one format, and in the case of the MFU in a single format, the MFU header may be optionally extended to contain information related to fragmentation. If different formats are provided for the MFU and the MU, the encoder may need additional work to distinguish which header should be written.
  • the MMT payload format includes a header field for an operation not supported by the RTP header, thereby transferring the encapsulated media data from one entity to another entity (S820).
  • S820 a header field for an operation not supported by the RTP header
  • new functions not supported by the existing protocol such as RTP must be placed in the MMT payload format to be transmitted through RTP. Both cases and cases transmitted via MMTP can work.
  • the media data providing method controls the delivery of the media data (S830).

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  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur un procédé de transmission de données multimédia par paquets comprenant un en-tête dans lequel un surdébit est réduit au minimum. Le procédé de transmission de données multimédia peut comprendre les étapes consistant à : encapsuler des données multimédia pour permettre à un en-tête d'unité de fragment multimédia (MFU) et à un en-tête de M unités de partager un même format ; autoriser un format de données utiles MMT à comprendre un champ d'en-tête pour une opération qui n'est pas prise en charge par un en-tête RTP, et transférer les données multimédia encapsulées d'une entité spécifique à une autre entité ; et commander le transfert des données multimédia. En conséquence, un surdébit de transmission est réduit au minimum, de sorte qu'il est possible de transmettre efficacement des données multimédia.
PCT/KR2012/004670 2011-06-13 2012-06-13 Procédé de transmission de données multimédia par paquets comprenant un en-tête dans lequel le surdébit est réduit au minimum WO2012173391A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US14/126,207 US9386125B2 (en) 2011-06-13 2012-06-13 Method for transmitting packet-based media data having header in which overhead is minimized
US15/175,953 US9473378B1 (en) 2011-06-13 2016-06-07 Method for transmitting packet-based media data having header in which overhead is minimized

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20110056661 2011-06-13
KR10-2011-0056661 2011-06-13
KR10-2012-0063213 2012-06-13
KR1020120063213A KR101857416B1 (ko) 2011-06-13 2012-06-13 오버헤드를 최소화한 헤더를 가지는 패킷 기반의 미디어 데이터 전송 방법

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US14/126,207 A-371-Of-International US9386125B2 (en) 2011-06-13 2012-06-13 Method for transmitting packet-based media data having header in which overhead is minimized
US15/175,953 Continuation US9473378B1 (en) 2011-06-13 2016-06-07 Method for transmitting packet-based media data having header in which overhead is minimized

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