KR102049039B1 - Method configuring and transmitting mmt transport packet - Google Patents

Abstract

The present specification discloses a structure and a method of setting an MMT transport packet for transmitting an MMT payload format. The specification sets the MMT transport packet to include at least one MMT payload format unit and to include a sequence number field for a packet stream, wherein the sequence number field is consistent with the sequence number field included in the MMT payload format. (consistency) is maintained. According to the present invention, a packet sequence number is provided in an MMT transmission, and when an MMT payload format is used over an RTP and an MMT payload format is used over an MMT transport packet, it can simultaneously support a general sequence number scheme for a packet stream. have.

Description

Setting method and transmission method of MMT transport packet {METHOD CONFIGURING AND TRANSMITTING MMT TRANSPORT PACKET}

The present invention relates to a MPEG Media Transport (MMT) transport packet, and more particularly, to a method and apparatus for setting or transmitting an MMT transport packet.

Since the conventional media fragment header is a part that is accessed and processed by the media encoder rather than a part that is processed by the system, it has a problem in that it is difficult to implement when the structure has a complicated structure and the availability is reduced.

Korean Registered Patent "Video Data Encoding System and Decoding System" (Registration No. 0965881, Cited Invention 1) discloses a video data encoding system and decoding system. According to an aspect of the present invention, an apparatus for encoding video data includes: a first encoding unit which encodes input video data according to a predetermined syntax to generate a first bitstream; A second encoder for generating a second bitstream by encoding input video data according to a syntax different from the predetermined syntax; And receiving the first bitstream or the second bitstream, and including header information including syntax type information indicating which syntax bitstream is encoded according to the first bitstream or the second bitstream. It includes a header information generation unit. According to Citation 1, image data may be independently encoded / decoded according to different encoding schemes, and scalable encoding / scalable decoding may be performed using different encoding schemes together. Citation Invention 1 includes the type information of the data stream, the layer type information, and the scalability type information, but does not include information regarding random access and AU.

In addition, U.S. Patents "MOVING PICTURE DECODING DEVICE, SEMICONDUCTOR DEVICE, VIDEO DEVICE, AND MOVING PICTURE DECODING METHOD" (Publication No. 2010-0021142, Cited Invention 2) and the standard U.S. Patent Publication "Advance macro-block entropy coding for advanced video standard" (Publication No. 2008-0260041, Cited Invention 3), which discloses a device that encodes a digital signature, is disclosed but does not depend on a specific media or codec. There remains a need for a method of transmitting and receiving relevant information.

An object of the present invention is to provide an MMT transport packet structure having a new structure and a method and apparatus for setting the structure.

According to an aspect of the present invention, the step of setting an MMT transport packet for transmitting an MMT payload format includes the at least one MMT payload format unit and includes the MMT transport packet so as to include a sequence number field for a packet stream. The sequence number field may be configured to maintain consistency with the sequence number field included in the MMT payload format.

The MMT payload format may include a field regarding a sequence number supported in an RTP packet.

PTS-equivalent functionality may be provided through an E-layer function.

The E-layer function may be provided by an M-unit.

The MMT payload format may aggregate or fragment units in MTU units.

According to another aspect of the present invention, a method of transmitting an MMT transport packet for transmitting an MMT payload format includes at least one MMT payload format unit and sets the MMT transport packet to include a sequence number field for a packet stream. Doing; And transmitting the set MMT transport packet, wherein the sequence number field may maintain consistency with a sequence number field included in the MMT payload format.

The MMT payload format may include a field regarding a sequence number supported in an RTP packet.

PTS-equivalent functionality may be provided through an E-layer function.

The E-layer function may be provided by an M-unit.

The MMT payload format may aggregate or fragment units in MTU units.

According to another aspect of the invention the MMT transport packet comprises a header portion and at least one media fragment unit (MFU), the MFU comprises at least one MMT payload format unit, the header portion for the packet stream A sequence number field may be included, and the sequence number field may maintain consistency with a sequence number field included in the MMT payload format.

The MMT payload format may include a field regarding a sequence number supported in an RTP packet.

PTS-equivalent functionality may be provided through an E-layer function.

The E-layer function may be provided by an M-unit.

The MMT payload format may aggregate or fragment units in MTU units.

According to the present invention, a packet sequence number is provided in an MMT transmission, and when an MMT payload format is used over an RTP and an MMT payload format is used over an MMT transport packet, it can simultaneously support a general sequence number scheme for a packet stream. have.

1 is a conceptual diagram illustrating an MMT hierarchical structure.
2 is a conceptual diagram illustrating a format of unit information (or data or packet) used for each layer of the MMT hierarchical structure.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Also, in order to clearly disclose the present invention, parts not related to the present invention are omitted, and the same or similar reference numerals in the drawings indicate the same or similar elements.

Hereinafter, the meaning of the term is defined as follows.

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 (AU) is the smallest data entity and may have time information as an attribute.

If coded media data for which decoding and presentation time information is not specified is relevant, 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 (MMT-ADC) is a description related to QoS requirements for delivering MMT assets. MMT-ADC is expressed without knowing the specific transmission environment.

MMT Composition Information (MMT CI) describes spatial and temporal relationships between MMT assets.

Media Fragment Unit (MFU) is a general container, which is independent of any particular codec, and accommodates encoded media data that can be consumed independently by a media decoder. It has information that is less than or equal to the access unit (AU) and can be used at the transport layer.

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 MMT Processing Unit is a generic container that is independent of any particular media codec and holds 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.

1 is a conceptual diagram illustrating an MMT hierarchical structure.

Referring to FIG. 1, 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 (E-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. In order to provide the necessary information for adaptive delivery, 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).

The E.3 layer encapsulates a Media Fragment Unit (MFU) provided from the Media Codec (A) layer to create a Media Processing Unit (MPU).

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.

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 made up 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.

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. 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 application layer protocol and format of the payload. 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 (D.3-layer) supports QoS by providing the function of exchanging information between layers by cross-layer design. For example, 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.

As illustrated in FIG. 1, 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. In addition, 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 (MFU) 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 dependencies between the MFUs in a single AU are 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. For example, 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. For time data, an AU may be delivered from at least one MFU, but one AU may not be divided into multiple MPUs. In non-time data, 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. In the time data, 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 (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 file, MPEG-U Widget Package, and JPEG file.

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. However, MMT program providers and clients that allow relaying or future reuse of MMT programs store them in MMT package format.

In parsing the MMT package, 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 thereof, 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.

The 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.

Like information to assist in the transmission and presentation of the 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. If HTML5 is designed to describe page-based presentations of text-based content, MMT-CI mainly represents spatial relationships between sources. In order to support the presentation of the temporal relationship between MMT assets, information related to MMT assets in the MMT package, such as presentation resources, time information for determining the order in which the 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. For example, if the loss indicator is '1', it may represent 'lossless', and if it is '0', it may represent '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. Alternatively, one content may consist of a plurality of MMT packages.

When one content consists of a plurality of MMT packages, composition information or composition information indicating temporal, spatial, and adaptive relations between the plurality of MMT packages ( configuration information) may exist inside one MMT package or outside the MMT package.

For example, in the case of hybrid delivery, some of the content components are transmitted through a broadcast network and the rest of the content components are transmitted through a broadband network. Can be. 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. Can be individually received and stored. Alternatively, there may be a scenario in which 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.

In the multi-view service scenario and / or widget scenario as described above, 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. .

In the multi-view service scenario and / or widget scenario as described above, 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 MMT package units and requires composition information or configuration information indicating a relationship between MMT packages.

The composition information or configuration information included in one MMT package may refer to an MMT asset in another MMT package, and may refer to an outside of an MMT package that refers to the MMT package in an out-band situation. I can express it.

Meanwhile, in order to inform the client terminal of a list of MMT assets 160 provided by a service provider and a possible path for delivery of the MMT package 160, the MMT package 160 is controlled through a control (C) layer. Translated into service discovery information, the MMT control message may include an information table for service discovery.

The server that divides 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 referred to by various names such as 'media presentation description (MPD)' or 'manifest file' according to a standardization mechanism for standardizing HTTP streaming. Hereinafter, the media information file is referred to and described as a media presentation description (MPD).

The cross-layer interface is described below.

The Cross Layer Interface (CLI) 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.

Two different methods can be used to provide the NAM. The first way is to provide an absolute value. And 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. There are two types of 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 transport packet is responsible for an application layer for transmitting the MMT payload format through a transport protocol of an Internet Protocol (IP) network. Hereinafter, the structure of the MMT transport packet according to the present invention will be described.

For example, according to the present invention, one MMT transport packet may include one MMT payload format (or MMT payload format unit). Aggregation or fragmentation of units according to MTU (MMT Transport Unit) units may be performed in the MMT payload format layer.

As another example, according to the present invention, an MMT transport packet may accept an operation that is commonly applicable to an existing Realtime Transport Protocol (RTP) payload format.

The MMT payload format may be used as an RTP payload format over RTP and at the same time may be used over an MMT transport packet. In the IP packet stream, a sequence number for the packet sequence such as error checking or recovery is required. The RTP packet may support a sequence number field for the sequence number. In addition, when the MMT payload format is used over the RTP, the sequence number of the RTP may be utilized. In addition, even if the MMT payload format is used over the MMT transport packet, in order to maintain consistency with the case where the MMT payload format is used over the RTP, the MMT transport packet has a general sequence number for the packet stream. It may have a field (general sequence number field).

Table 1 below shows an example of an MMT transport packet. The components of Table 1 are not limited to the order in which the components are not exclusive, and may further include other components or one or more components may be deleted.

Here, sequence_no represents the sequence number of the packet stream and increases by 1 per packet.

As RTP is used on top of the User Datagram Protocol (UDP) layer, the two largest features provided for media streaming are packet sequence numbers and timestamps. Here, the time stamp provides a PTS-equivalent function, and in the MMT, the PTS may be provided in an E-layer function, specifically, an M-unit. have.

Therefore, according to the present invention, when packet sequence number is provided in MMT transmission and MMT payload format is used over RTP and MMT payload format is used over MMT transport packet, it is possible to simultaneously support general sequence number scheme for packet stream. Can be.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (16)

In the packet generating apparatus for packetizing and transmitting the media data,
An encapsulation unit for generating a media processing unit by encapsulating a media fragment unit, and generating an asset based on the media processing unit; And
A packetizer configured to generate a packet by packetizing a media processing unit included in the asset,
The packetizer generates a packet by including a sequence number field for counting a transmitted packet,
The media processing unit comprises at least one random access point,
The asset includes an asset header and encoded media data, and is a group of media processing units having the same asset identification for the encoded media data. Packet generating device. The method of claim 1,
And the sequence number field is included in a header of the packet. The method of claim 1,
And a value of the sequence number field is increased by one for each transmitted packet. The method of claim 1,
And a predetermined data unit in the packet is packetized in a predetermined transmission unit size. The method of claim 4, wherein
And the predetermined data unit comprises a media processing unit. The method of claim 1,
And the sequence number field maintains consistency with a sequence number field included in a payload format in a packet. The method of claim 1,
Packet generation apparatus, characterized in that PTS-equivalent function is provided through an E-layer function. The method of claim 7, wherein
And wherein the E-layer function is provided is a media processing unit. In the packet generation method for packetizing and transmitting the media data,
Encapsulating a media fragment unit to generate a media processing unit, and generating an asset based on the media processing unit; And
Packetizing a media processing unit included in the asset to generate a packet,
The generating a packet comprises generating the packet by including a sequence number field for counting a transmitted packet,
The media processing unit comprises at least one random access point,
The asset includes an asset header and encoded media data, and is a group of media processing units having the same asset identification for the encoded media data. Packet generation method to do. The method of claim 9,
And the sequence number field is included in a header of the packet. The method of claim 9,
And a value of the sequence number field is increased by one for each packet to be transmitted. The method of claim 9,
And a predetermined data unit in the packet is packetized in a predetermined transmission unit (MTU) size. The method of claim 12,
And said predetermined data unit comprises a media processing unit. The method of claim 9,
And the sequence number field maintains consistency with a sequence number field included in a payload format in a packet. The method of claim 9,
PTS-Equivalent (Presentation Time stamp-equivalent) function is provided via the E-layer function (E-layer function). The method of claim 15,
And wherein said E-layer function is provided is a media processing unit.

Images