KR20120029300A - Method and apparatus for representing common attribute for a plurality of content elements in hypertext transfer protocol streaming service - Google Patents

Abstract

PURPOSE: A representation method of a common attribute and an apparatus thereof are provided to repetitively offer representation by commonly supplying information if an attribute about content configuration elements is represented. CONSTITUTION: An MPD(Media Presentation Description) analyzer analyzes a received MPD(105). Information for explaining groups is confirmed. A consumable group is selected. Representation information without a group value is confirmed. A service is started by requesting selected configuration element data.

Description

METHOD AND APPARATUS FOR REPRESENTING COMMON ATTRIBUTE FOR A PLURALITY OF CONTENT ELEMENTS IN HYPERTEXT TRANSFER PROTOCOL STREAMING SERVICE}

The present invention relates to a method and apparatus for expressing an attribute of a content in a hypertext transfer protocol (HTTP) streaming service. More particularly, the present invention relates to a method and apparatus for expressing common attributes for a plurality of content components in an HTTP streaming service.

First, terms used in the present specification will be described.

Content refers to a creation, such as a movie, music, or news, or a storage form thereof.

A content component is a component constituting the content, for example, video, audio, subtitles, metadata, auxiliary information streams, and the like.

Representation may include expressions such as low picture quality or high picture quality. But in this case, the context is the same.

On the other hand, 3GPP Adaptive Http Streaming (AHS) has the same content (content component), content components (content component) different conditions (for example, network bandwidth (twork bandwidth), resolution (resolution), Representations encoded with a codec, etc., and the total length are divided into several equal periods, and the period is again short enough (e.g., 1 second to 10 seconds). ), Which is called the "segmentation" process, and functions as a Multimedia Presentation Description-Manifest file that specifies the file name, sequence number, start time, length, and so on for each segment. Is made of.

The segment includes an initialization segment including information for decoder configuration so that the representation can be properly decoded, and a media segment including the segmented content components. segments).

The client first receives the MPD, checks which representations are included, then determines the performance of the client device, capability, network speed, etc., and selects a suitable representation to select a fragment. Download in order and start playback.

If changeable variables, such as network bandwidth, change, for example, when the network speed is high, a fragment of a representation written at a higher bandwidth is selected and played back, resulting in network The image quality varies depending on the speed of playback, but playback can be achieved without interruption.

Meanwhile, MPEG DASH (Dynamic Adaptive Streaming over HTTP) refers to an adaptive streaming technology based on the 3GPP AHS.

The present invention provides a method for providing information that can be commonly applied to a plurality of representations or groups of representations described in one MPD.

The present invention relates to a method of expressing a common property for a plurality of content elements in a hypertext transfer protocol streaming service, comprising providing and describing information that can be provided in common by group.

In the present invention, when an attribute of a plurality of content elements is expressed in an HTTP streaming service, since information that can be provided in common is described and provided for each group, the present invention may be repeatedly described and provided in an expression. There is no need to effect.

1 is a view for explaining an embodiment of the present invention,
2 is a view for explaining another embodiment of the present invention;
3 is a view for explaining another embodiment of the present invention.

All the contents described in the present invention may be referred to each other between the embodiments, and combinations of the embodiments may be possible.

Hereinafter, the present invention describes a method of providing information that can be commonly applied to a plurality of expressions or groups of expressions described in one MPD.

Existing expressions (representation) and group (group) can be described as Table 1 below.

Structurally, the expression (representation) and the group (group) can be in the form of a number of (representation) in the group (group).

That is, referring to Table 1, it can be seen that group = “1” includes representation = “1” and representation = ”2”.

That is, when indicating a group, it can be considered that both representation = “1” and representation = ”2” are selected.

However, in the current MPD technology, since each representation represents only a certain group, all information is described for each representation.

However, representations used as a group are used exclusively with each other. That is, only one of the groups can be selected and used, and an expression having the same group value in the same time zone cannot be selected and used at the same time. Therefore, it may be regarded as a selectable media component, and thus may have information that can be provided in common.

As an example, the expressions of group = “1” may be composed of all of the Internet media types, that is, mimetypes, as mp4 video.

As another example, the expressions of group = “2” may be composed of audio tracks all composed in English.

When information that can be provided in common is described and provided for each group, it is not necessary to repeatedly describe and provide information in an expression.

In addition, adaptive information or annotative information, which may be additionally provided according to network conditions, device capabilities, user preferences, and the like, may be additionally added. In the case of providing more, the efficiency increases further as the information to be described increases.

A method of providing the information that can be commonly provided is as follows.

That is, according to the present invention, it is possible to provide a new element or attribute that can describe a group. Adaptive or annotative information, which may be additionally provided according to network conditions, device capabilities, user preferences, etc., may be a1, a2, Although abbreviated as a3, the information described above in the present invention may be applied and used.

<groupInfo idref = ”1”, a1 = ”x”, a2 = ”x, x”, a3 = ”. ”/>

The indication value of the group to be explained can be indicated through attribute values such as idref, and additional attributes can be added.

The expression method may be changed and expressed as shown in Table 2 below.

That is, each commonly provided information may be separately described as separate elements. In this case, it may be advantageous to describe the information to be provided in more detail according to the information or to be referred from the outside.

In this case, the expressions and the groups may be set to have unique values in the MPD. At least, each representation and group must have a unique value per period.

Even within a group, there may be an expression that does not want to use a common value. In this case, the same information may be described in the representation, and may be overridden or processed by considering that the information in the representation has a higher priority. Alternatively, an indication that should be excluded from application of common information may be indicated and displayed.

In addition, the expression method of the information may be changed and expressed in various ways, but may be regarded as the same as long as it meets the purpose of the information provided in common.

The location for providing the information may vary as follows.

That is, it can be placed inside the MPD, above the period, child elements of the period, outside the MPD, or in a separate file (in this case, referencing in the MPD through various methods such as xinclude). Can be.

Using the above information, the process of providing a service is possible in the following embodiments (1), (2) and (3).

(1) By using the information describing each group, the available group can be identified first, and then the expression belonging to the group and the expression not belonging to the group. It is a way to organize and provide services. This is illustrated in FIG. 1.

1 is a view for explaining an embodiment of the present invention.

When the MPD is received in step 101, the received MPD is transmitted to the MPD interpreter in step 103, and the MPD is interpreted in step 105. In step 107, information describing each group is checked, and in step 109, a consumable group is selected. In step 111, the expression belonging to the selected group and the expression information that does not have a group and a group value that do not provide additional additional information are checked. In step 113, the selected content component data is requested, and in step 115, the service is started.

(2) Using the information describing each group, the available group is first identified, and in the expression belonging to the group and the expression not belonging to the group, It is a method of providing services by selecting. This is illustrated in FIG. 2.

2 is a view for explaining another embodiment of the present invention.

Steps 201 to 211 are the same as steps 101 to 111 of FIG. 1 and will not be described. In step 213, the expression is selected based on the expression information. In step 215, the component data of the selected expression is requested, and in step 217, the service is started.

(3) Representation is interpreted first, a representation that can be provided (representation) is selected, and using the information describing each group (group), through the selection process, the service is configured and provided. This is illustrated in FIG. 3.

3 is a view for explaining another embodiment of the present invention.

Steps 301 to 305 are the same as steps 101 to 105 of FIG. 1. In step 307, information of expressions is interpreted, and in step 309, expressions that can be provided are selected. In step 311, information about a group to which the selected expression belongs is checked. In step 313, a serviceable expression and a group are selected. In step 315, the content component data of the selected expression is requested, and in step 317, the service is started.

Claims (1)

In the hypertext transfer protocol streaming service, a method for representing common attributes for a plurality of content components,
A method of expressing common attributes, including a process of describing and providing information which can be commonly provided for each group.

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