KR101744974B1 - Method and apparatus for representing common attribute for a plurality of content elements in hypertext transfer protocol streaming service - Google Patents

Abstract

In the present invention, when attributes of a plurality of content elements are expressed in an HTTP streaming service, information that can be provided in common is described by groups, so that it is necessary to repeatedly describe the information in a representation no need.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for displaying a common attribute for a plurality of content components in a hypertext transfer protocol streaming service,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for representing attributes of contents in a Hypertext Transfer Protocol (HTTP) streaming service. And more particularly, to a method and apparatus for representing common attributes for a plurality of content components in an HTTP streaming service.

First, terms used in this specification will be described.

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

A content component is a component constituting the content, and examples thereof may include video, audio, subtitle, metadata, auxiliary information stream, and the like.

Representation can be, for example, expressions such as low image quality or high image quality. In this case, however, the context is the same.

Meanwhile, the Adaptive Http Streaming (AHS) of the 3GPP has the same contents and content components under different conditions (for example, twork bandwidth, resolution, Codecs and the like and the whole lengths are divided into several equal periods and the corresponding period is divided into a sufficiently short period of time (for example, 1 second to 10 seconds MPD (which functions as a Multimedia Presentation Description-Manifest file) which specifies a file name, a sequence number, a start time, and a length of each segment and divides the segment into a plurality of segments (referred to as a "segmentation" .

The segment includes an initialization segment including information for a decoder configuration so as to properly decode a corresponding representation and a media segment including media segments including the segmented content components. segments.

The client first receives the MPD, determines which representation is included, determines the performance, capability, and network speed of the client device, and selects a suitable representation to determine the fragment Download them in order and start playback.

If variable variables, such as network bandwidth, change, for example, when the network speed increases, a fragment of a representation created with a higher bandwidth is picked up and reproduced, The image quality is changed according to the speed of the image.

Meanwhile, MPEG DASH (Dynamic Adaptive Streaming over HTTP) refers to an adaptive streaming technique using the 3GPP AHS as a baseline.

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

The present invention relates to a common attribute presentation method for a plurality of content elements in a hypertext transfer protocol streaming service, and includes the steps of describing information that can be provided in common for each group.

In the present invention, when attributes of a plurality of content elements are represented in an HTTP streaming service, information that can be provided in common is described by groups, so that it is necessary to repeatedly describe the information in a representation There is no need to have an 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 contents described in the present invention can be mutually referenced among the embodiments, and combinations of the embodiments are also possible.

In the following description of the present invention, a method of providing information that can be commonly applied to a plurality of groups of expressions or representations described in one MPD will be described.

Existing representations and groups can be described as in Table 1 below.

Structurally, representations and groups can be in the form of multiple representations within a group.

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

That is, when a group is indicated, both representation = "1" and representation = "2" can be regarded as being selected.

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

However, expressions used in one group are used exclusively to select one another. That is, only one of the groups can be selected and used, and a representation having the same group value at the same time can not be selected and used at the same time. Therefore, it can be regarded as one selectable media component, so that it can have information that can be provided in common.

For example, the representations of group = "1" may consist of an internet media type, that is, a mime type (mimetype) video in the form of mp4.

As another example, the representations of group = " 2 " may all consist of audio tracks organized in English.

When the information that can be provided in this way is described by group, it is not necessary to repeatedly describe the information in a representation.

Further, an additional aptive information or annotative information which can be additionally provided according to network conditions, device capability, user preference, If more information is provided, the efficiency increases as information to be described increases.

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

That is, according to the present invention, a new element or an attribute capable of describing a group can be provided. Adaptive information or annotative information that can be additionally provided according to network conditions, device capability, user preference, etc. may be a1, a2, a3. However, this information can be used by applying the information described in the first half of the present invention.

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

You can indicate the value of the group that you want to describe through the attribute value, such as idref, and add additional attributes.

The above expression can be changed as shown in Table 2 below.

That is, each information provided in common can be separately described as separate elements. In this case, there may be an advantage in describing the information to be provided more specifically according to the information or to be referred to from the outside.

At this time, the representations and groups can be set to have unique values within the MPD. At a minimum, expressions and groups by period should have unique values.

There may be a representation in a group that does not want to use a common value. In this case, the same information may be described in the representation to override or treat the information inside the representation as having a higher priority. Alternatively, a representation to be excluded from the application of the common information can be indicated and displayed.

The manner of expressing information can be varied and expressed in various other ways, but it can be regarded as the same if it meets the purpose of the information provided in common.

The location for providing the information may be varied as follows.

In other words, it can be located inside the MPD, in the upper part of the period, in the child element of the period, outside the MPD, or in a separate file (refer to the MPD through various methods such as xinclude in this case) .

The process of providing the service using the information may be the embodiments (1), (2), and (3) described below.

(1) Using available information describing each group, a group that can be provided is first identified, and a representation belonging to the corresponding group and a representation not belonging to the group And a service is constituted and provided. This is illustrated in FIG.

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

When the MPD is received in step 101, the received MPD is delivered to the MPD analyzer in step 103, and the MPD is analyzed in step 105. [ In step 107, information describing each group is confirmed, and in step 109, a group that can be consumed is selected. In step 111, expression information that does not have a group and group value that does not provide an expression and additional information belonging to the selected group is checked. In step 113, the selected content component data is requested, and in step 115, the service is started.

(2) By using the information describing each group, a group that can be provided is confirmed first, and a representation belonging to the corresponding group and a representation not belonging to the group It is a method to provide services selectively. This is illustrated in FIG.

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 thus description thereof will be omitted. In step 213, the expression is selected based on the expression information. In step 215, the element data of the selected expression is requested. In step 217, the service is started.

(3) a method of analyzing a representation first, selecting a representable representation, and then providing a service through a selection process using information describing each group. This is illustrated in FIG.

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. In step 307, the information of expressions is analyzed, and in step 309, available expressions are selected. In step 311, information on the group to which the selected expression belongs is checked, and in step 313, a serviceable expression and a group are selected. In step 315, the content element data of the selected expression is requested, and the service is started in step 317.

Claims (16)

A method for providing media data,
Transmitting media description information related to the media data to a client;
Receiving a request for media data selected based on the media description information from the client; And
And transmitting the requested media data to the client,
Wherein the media description information is described for each group including a plurality of representations having at least one common attribute among the representations encoded on different conditions based on one content. How to provide data.
The information processing apparatus according to claim 1,
The identification information of the group, the identification of the representations included in the group, and information about the at least one common attribute.
3. The method of claim 2, wherein the identification information of the group and the identification information of the representations are unique values in units of a predetermined time interval.
2. The method of claim 1, wherein the media description information includes identification information of at least one representation that is not included in the group.
A method for receiving media data,
Receiving media description information related to the media data from a server;
Selecting media data based on the media description information;
Requesting the selected media data to the server; And
And receiving the requested media data,
Wherein the media description information is described for each group including a plurality of representations having at least one common attribute among the representations encoded on different conditions based on one content. A method for receiving data.
6. The information processing apparatus according to claim 5,
The identification information of the group, the identification information of the representations included in the group, and information about the at least one common attribute.
7. The method of claim 6, wherein the identification information of the group and the identification information of the representations are unique values in units of a predetermined time interval.
6. The method of claim 5, wherein the media description information includes identification information of at least one presentation that is not included in the group.
An apparatus for providing media data,
A transmitter for transmitting media description information related to the media data to a client; And
And a receiving unit for receiving a request for media data selected based on the media description information from the client,
Wherein the transmitting unit transmits the requested media data to the client,
Wherein the media description information is described for each group including a plurality of representations having at least one common attribute among the representations encoded on different conditions based on one content. A device that provides data.
10. The information processing apparatus according to claim 9,
The identification information of the group, the identification information of the representations included in the group, and information about the at least one common attribute.
11. The apparatus of claim 10, wherein the identification information of the group and the identification information of the representations are unique values in units of a predetermined time interval.
10. The apparatus of claim 9, wherein the media description information includes identification information of at least one presentation that is not included in the group.
An apparatus for receiving media data,
A receiving unit for receiving media description information from a server; And
And a control unit for selecting media data based on the media description information and requesting the selected media data to the server,
The receiving unit may include receiving the requested media data,
Wherein the media description information is described for each group including a plurality of representations having at least one common attribute among the representations encoded on different conditions based on one content. An apparatus for receiving data.
14. The method as claimed in claim 13,
The identification information of the group, the identification information of the representations included in the group, and information about the at least one common attribute.
15. The apparatus of claim 14, wherein the identification information of the group and the identification information of the representations are unique values in units of a predetermined time interval.
14. The apparatus of claim 13, wherein the media description information includes identification information of at least one presentation not included in the group.

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