KR100660024B1 - Method and apparatus for addressing media resource, and recording medium thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for media resource addressing and a recording medium thereof. The media resource addressing method according to the present invention is a media resource addressing method of a media file including a meta data region and a media data region including a step of extracting a corresponding media resource according to reference information of a media resource recorded in the DID. Storing the extracted media resource in the media data area, generating standard location information of the media resource, storing the generated standard location information in the metadata area, and filing the metadata area and the media data area. It includes a step.

Media resource, MPEG-21, standard location information, DID, addressing method

Description

METHOD AND APPARATUS FOR ADDRESSING MEDIA RESOURCE, AND RECORDING MEDIUM THEREOF

1 is a block diagram conceptually illustrating an ISO media file format based on WD1.1.

2 illustrates a media resource addressing apparatus according to an embodiment of the present invention.

3 is a flowchart illustrating a media resource addressing method according to a first embodiment of the present invention.

4 is a flowchart illustrating a media resource addressing method according to a second embodiment of the present invention.

The present invention relates to a method and apparatus for media resource addressing, and more particularly, to a method and apparatus for addressing media resources in a Motion Picture Experts Group (MPEG) -21 file format.

MPEG-21 is a branch of MPEG that establishes a distribution framework and establishes various element technologies and related technical standards to establish an infrastructure for efficient transmission and distribution of multimedia information in heterogeneous distributed systems on the Internet. Aim to do.

Currently, the basic structure for storing DID and media content based on the ISO media file format as MPEG-21 file format WD1.1 has been proposed, but no specific method for addressing media resources in the DID has been presented.

It is an object of the present invention to provide a method and apparatus for addressing media resources in the MPEG-21 file format.

It is another object of the present invention to provide a method and apparatus for addressing media resources such that compatibility of MPEG-21 files with MPEG-4 files is provided in the ISO media file format.

A media resource addressing method according to an aspect of the present invention is a media resource addressing method of a media file including a meta data area and a media data area including a DID, and corresponding media according to reference information of the media resource recorded in the DID. Extracting resources; Storing the extracted media resource in the media data area; Generating standard location information of the media resource; Storing the generated standard location information in the metadata area; And filing the meta data area and the media data area.                     

In the media resource addressing method according to an aspect of the present invention, standard position information of the media resource is generated using an offset value of the media data area in which the media resource is stored.

In the media resource addressing method according to an aspect of the present invention, when the media resource is present in an MPEG-4 file, the standard position information includes an offset value of the MPEG-4 file stored in the media data area; The location information of the media resource in the MPEG-4 file is generated.

In the media resource addressing method according to an aspect of the present invention, the position information of the media resource present in the MPEG-4 file is a track value present in the metadata area of the MPEG-4 file.

In the media resource addressing method according to an aspect of the present invention, the location information of the media resource present in the MPEG-4 file is an Object Descriptor ID (ODID) and an Elementary Streem ID (ESID) value of the media resource.

In the media resource addressing method according to an aspect of the present invention, the metadata area further includes a local item area, and the standard location information is stored in the local item area.

In a media resource addressing method according to an aspect of the present invention, the media file is an MPEG-21 file.

In accordance with another aspect of the present invention, a media resource addressing method includes a media resource addressing method of a media file including a meta data area and a media data area, the method comprising: reading reference information of a media resource recorded in the DID; If the media resource is present in another media file, reading reference information of the media resource in the other media file; Generating standard location information using reference information of the media resource and reference information in the other media file; Storing the standard location information in the metadata area; And filing the metadata area.

A media resource addressing apparatus according to an aspect of the present invention is a media resource addressing apparatus of an MPEG-21 file including a meta data region including a DID and a media data region, and includes reference information of the media resource recorded in the DID. A DID reading unit that reads, determines whether the DID refers to the media resource in or out of the file, and outputs reference information of the media resource if the DID refers to the media resource in the file; A media resource extracting unit extracting a media resource based on the reference information output from the DID reading unit and storing the media resource in the media data area; A standard location generator for generating standard location information of the media resource and storing the standard location information in the metadata area; And a filing unit for filing the meta data area and the media data area into one file.

A recording medium recording a media resource addressing program according to an aspect of the present invention is a recording medium which records a media resource addressing program of an MPEG-21 file including a metadata area including a DID and a media data area. The program reads the media resource reference information recorded in the DID; When the DID refers to a media resource in a file, the media resource is extracted and stored in the media data area, and standard position information of the media resource is generated using an offset value of the media data area in which the media resource is stored. Function; And generating the standard location information of the media resource by using the location information of the media resource when the DID exists outside the file.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a block diagram conceptually illustrating an ISO media file format based on WD1.1.

The ISO media file format shown in FIG. 1 is a file format for supporting MPEG-4 files as well as MPEG-21 files, and includes a metadata area (Meta-data box 110) and media data of MPEG-21 files. Area (mdat) 120 and metadata area (moov) 130 of the MPEG-4 file.

The MPEG-21 file format includes a metadata area 110 and a media data area 120, and the MPEG-4 file format includes a metadata area 130 and a media data area 120.

The metadata area 110 of the MPEG-21 file format includes a DID, a handler area, a data information box, an item location area, and the like. DID is a text document expressed in xml and contains a reference value of a media resource. The handler area indicates the type of meta data, and the data information area stores reference information of external media data. In addition, the item location area includes standard location information of the media resource present in or outside the file, to enable access to the media resource.

The media data area 120 stores various media resources such as audio, video, and JPEG files. In particular, in the case of the MPEG-21 file format, as illustrated in FIG. 1, data in the MPEG-4 file format may be stored in the media data area 120.

The detailed structure and functions of the metadata area 130 of the MPEG-4 file are described in detail in the MPEG-4 system 14496-1. The metadata area 130 of the MPEG-4 file may be represented as a set of tracks, and each track includes media including information of a media resource. Thus, the track information can be used to access the media resource in the media data area 120.

2 illustrates a media resource addressing apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the media resource addressing apparatus according to an embodiment of the present invention includes a DID reader 210, a media resource extractor 220, a standard location information generator 230, and a filer 240. ).

The DID reader 210 reads the input DID to determine whether the DID refers to the media resource in or out of the file, and extracts the media resource reference information when the DID refers to the media resource in the file. The unit 220 transmits.

The media resource extracting unit 220 extracts the media resource according to the reference information of the media resource and stores it in the media data area 120.

The standard location information generator 230 generates standard location information of the media resource and stores the metadata in the metadata area 110, and the filer 230 files the metadata area 110 and the media data area 120. By doing so, one MPEG-21 file is generated.

Hereinafter, a media resource addressing method according to an embodiment of the present invention will be described.

According to one embodiment of the present invention, another addressing method is applied when a media resource is referred to in a file and when referred to outside the file. Therefore, hereinafter, the media resource addressing method when the media resource is referred to in the file will be described as the first embodiment, and the media resource addressing method when the media resource is referred to outside the file will be described as the second embodiment.

3 is a flowchart illustrating a media resource addressing method according to a first embodiment of the present invention.

In the media resource addressing method according to the first embodiment of the present invention, as shown in FIG. 3, the DID input step (S301), the media resource reference information reading step (S302), the media resource extraction step (S303), and the media resource are shown. A storage step S304, an offset value reading step S305, standard position information generation and storage step S306, and a filing step S307.

Specifically, when a DID is input (S301), the DID reader 210 reads the DID and extracts reference information (Resource ref) of the media resource (S302). Thereafter, the media resource extracting unit 220 extracts the media resource by reference information (Resource ref) of the media resource (S303).

That is, when the following reference information is recorded in the DID, the media resource extracting unit 220 extracts a video file called test.mp4 located in the C drive and stores it in the media data area 120 (S304).

<Resource ref = "c: \ test.mp4" mimeType = "video / mp4">

Thereafter, the offset value of the media data area 120 in which the media resource is stored is calculated (S305) to generate standard position information, and stored in the metadata area 110 (S306). Here, the offset value refers to a location where the extracted media resources are stored in the media data area 120. When the media resources are stored in the media data area 120 in turn, the media to be stored next is according to the size of each stored resource. The offset value of the resource is determined.

According to the first embodiment of the present invention, the standard location information may be stored in a predetermined position of the metadata area 110, and may be stored in an item location area among the metadata area 110.

Thereafter, when the filing process S307 is performed, the metadata area 110 and the media data area 120 are formed into one MPEG-21 file.

Hereinafter, a method of generating standard position information according to the first embodiment of the present invention will be described in detail.

According to the first embodiment of the present invention, when the media resource is a general video file, an audio file, a JPEG file, or the like, standard position information may be generated using an offset value as follows.

<Resource target = "offset = 1000" mimeType = "video / mp4">

When the media resource existing in the file is an MPEG-4 file, standard position information may be generated as follows using the track value existing in the metadata area 130 of the MPEG-4 file.

<Resource target = "# offset = 1000 / moov / trak [1]" mimeType = "video / mp4">

The standard position information refers to an elementary stream (ES) of a video type indicated by the first track of the metadata area 130 of the MPEG-4 file, and access and reproduction of the MPEG-4 file is controlled by the position information. It becomes possible.

In the case where the media resource is an MPEG-4 file, as shown below, the moov included between the offset value and the track value is deleted and the special symbol '/' is added to indicate that the file to be referred to is the MPEG-4 file format. Can be represented.

<Resource target = "# offset = 1000 // trak [1]" mimeType = "video / mp4">

Furthermore, according to the first embodiment of the present invention, when referring to an ES having a specific ODID and ESID value in an MPEG-4 file, standard position information may be generated by a combination of an offset value, an ODID, and an ESID value as follows. have.

<Resource target = "# offset = 1000: odid = 0x10 & esid = 0x11">

That is, when the odid value is 0x10 and the esid value is 0x11, addressing can be performed by using the offset value, the odid value and the esid value of the MPEG-4 file.

4 is a flowchart illustrating a media resource addressing method according to a second embodiment of the present invention.

The media resource addressing method according to the second embodiment of the present invention is an addressing method when a media resource is referred to outside of a file, and includes a DID input step (S401), a media resource reference information read step (S402), and a media resource as MPEG-4. It is determined whether the file is a file (S403), the location information extraction step (S404) of the MPEG-4 file, the standard location information generation step (S405), and the file conversion step (S406).

Specifically, when a DID is input (S401), the DID reading unit 210 reads reference information (Resource Ref) of the media resource (S402), and extracts URL information in which the media resource exists.

After that, the positional information of the media resource to be referred to is read (S403). That is, if the media resource exists in the MPEG-4 file, the track information or ESID, OSID, etc. of the metadata area 130 are extracted. If the media resource is an MPEG-21 file, the offset value of the media resource exists. Extract

The standard location information generation unit 230 generates standard location information by using the extracted information, and stores the standard location information in the metadata area 110 (S404). Thereafter, the filer 240 files the metadata area (S405), thereby generating an MPEG-21 file in which standard position information is recorded.

Hereinafter, a method of generating standard location information according to a second embodiment of the present invention will be described in detail.

In the method of generating standard location information according to the second embodiment of the present invention, the URL and the track information of the MPEG-4 file are used when the media resource to which the media resource exists or the media resource to be referred to is an MPEG-21 file. 4 Create standard location information using the ESID and OSID of the file.

For example, when referring to a video file (test.avi) existing at a specific site 'www.etri.re.kr', standard location information may be generated as follows using a URL where a video file exists.

<Resource target = "http://www.etri.re.kr/test.avi" mimeType = "video / avi">

Also, if you want to externally refer to the ES indicated by the first track value 'track [1]' of the MPEG-4 file 'test.mp4' that exists on a specific site 'www.etri.re.kr', MPEG- 4 Standard location information can be generated as follows using track information indicating the URL where the file exists and the ES.

<Resource target = http: //www.etri.re.kr/test.mp4: moov / track [1] "mime Type =" video / mp4 ">

In this case, by adding the special symbol '/' instead of moov, it may indicate that the file to be referred to is an MPEG-4 file.

In addition, when externally referring to the ES indicated by the media existing in the first track in the MPEG-4 file, the URL in which the MPEG-4 file exists, track information indicating the ES, and media information are used. You can create standard location information as follows:

<Resource target = http: //www.etri.re.kr/test.mp4: moov / track [1] / media "mime Type =" video / mp4 ">

In this case too, moov can be replaced with the special symbol '/'.

Furthermore, according to an embodiment of the present invention, when referring to an ES having a specific ODID and ESID value in an MPEG-4 file, a combination of a URL where an MPEG-4 file exists and an ODID and ESID of the ES is as follows. Standard location information can be generated.

<Resource target = "http://www.etri.re.kr/test.mp4:odid=0x10&esid=0x11">

That is, when the ODID value is 0x10 and the ESID value is 0x11, addressing can be performed by using the ODID value and the ESID value of the URL and the MPEG-4 file.

In addition, when referring to an MPEG-4 file stored at a specific location in an external MPEG-21 file, the URL of a site where the MPEG-21 file exists, the media data area 120 in which the MPEG-4 file is stored Standard position information can be generated by including a combination of an offset value of, and an ODID and an ESID of an MPEG-4 file.

For example, when referencing a media resource with odid = 0x10 and esid = 0x11 from among ESs constituting an MPEG-4 file stored at an offset value of 1000 in 'test.mp21' externally, Standard location information can be created in the form of.

<Resource ref = "http://www.etri.re.kr/test.mp21#offset=1000:odid=0x10&esid=0x11">

In this way, it is possible to refer to various media resources existing in an externally present MPEG-21 file.                     

The standard location information generation method according to an embodiment of the present invention has been described above. According to an embodiment of the present invention, the standard location information of the media resource is stored in the item location area of the metadata area 110. In this case, the item location area may be defined by syntax and semantics as described below.

According to one embodiment of the invention, the syntax of the item location area is described as follows.

Item Location Box Syntax

aligned (8) class ItemLocationBox extends FullBox ('iloc', version = 0, 0) {

unsigned int (4) offset_size;

unsigned int (4) length_size;

unsigned int (4) base_offset_size;

unsigned int (1) reference_type

unsigned int (3) reserved

unsigned int (16) item-count;

for (i = 0; i <item-count; i ++)

{

unsigned int (16) Item-ID

unsigned int (16) data-reference-index;

 if (reference_type == 0)                     

 {

 offset;

 length;

 base_offset;

 }

 if (reference_type == 1)

offset;

String location;

}

}

In addition, according to another embodiment of the present invention, the syntax of the item location area may be described as follows.

aligned (8) class ItemLocationBox extends FullBox ('iloc', version = 0, 0) {

unsigned int (4) offset_size;

unsigned int (4) length_size;

unsigned int (4) base_offset_size;

unsigned int (1) reference_type

unsigned int (3) reserved

unsigned int (16) item-count;                     

for (i = 0; i <item-count; i ++)

{

Item-id

data-reference-index

Stringlocation

direct-offset

 if (direct-offset == 1)

 {

 offset;

 length

 base_offset;

 }

}

}

The semantics of the item location area according to an embodiment of the present invention can be described as follows.

Item Location Box semantics

offset_size is taken from the set {0, 4, 8} and indicates the length in bytes of the offset field.

length_size is taken from the set {0, 4, 8} and indicates the length in bytes of the length field.

item-count counts the number of items in the following array.

item-ID is an arbitrary integer 'name' for this item which can be used to refer to it (e.g. in a URL).

data-reference-index is either zero ('this file') or a 1-based index into the data references in the data information box.

offset provides the absolute offset in bytes from the beginning of the containing file, of this meta-data item. If offset_size is 0, offset takes the value 0

lengthprovides the absolute length in bytes of this meta-data item. If length_size is 0, length takes the value 0. If the value is 0, then length of the item is the length of the entire referenced file.

base_offsetprovides a base value for offset calculations within the referenced data. If base_offset_size is 0, base_offset takes the value 0, i.e. it is unused.

reference_type specifies the type of referenced item. If this value is 1, then the referenced media resource is an ES in mp4 presentation.

Location specifies the information of which ES within a mp4 presentation is referenced. In case that an ES in the first track in mp4 presentation is referenced, string value, "moov / trak [1]" or "// trak [1]", will be defined. In addition, an ES can be referenced with odid and esid (e.g. odid = 0x10 & esid = 0x11).

In addition, when data-reference-index is 0, URL / URN information of a media resource for external reference is defined as a string in the data information area (dataInformationBox). In this case, the syntax and semantics of the data information area are defined as follows.

Data Information Box Syntax

(1) aligned (8) class DataEntryUrlBox (bit (24) flags)

extends FullBox ('url', version = 0, flags) {

stringlocation;

}

(2) aligned (8) class DataEntryUrnBox (bit (24) flags)

extends FullBox ('urn', version = 0, flags) {

string name;

string location;

}

(3) aligned (8) class DataReferenceBox

extends FullBox ('dref', version = 0, 0) {

unsigned int (32) entry_count;

for (i = 1; i = entry_count; i ++) {                     

DataEntryBox (entry_version, entry_flags) data_entry;

}

}

Data Information Box Semantics

version is an integer that specifies the version of this box

entry_count is an integer that counts the actual entries

entry_version is an integer that specifies the version of the entry format

entry_flags is a 24-bit integer with flags; one flag is defined (x000001) which means that the media data is in the same file as the Movie Box containing this data reference.

data_entry is a URL or URN entry. Name is a URN, and is required in a URN entry. Location is a URL, and is required in a URL entry and optional in a URN entry, where it gives a location to find the resource with the given name. Each is a null-terminated string using UTF-8 characters. If the self-contained flag is set, the URL form is used and no string is present; the box terminates with the entry-flags field. The URL type should be of a service that delivers a file (e.g. URLs of type file, http, ftp etc.), and which services ideally also permit random access. Relative URLs are permissible and are relative to the file containing the Movie Box that contains this data reference.

The media resource addressing method and apparatus according to an embodiment of the present invention have been described above. However, the present invention relates to an embodiment to which the concept of the present invention is optimally applied, and the scope of the present invention is not limited to the above embodiment, and various modified embodiments may be configured using the concept of the present invention as it is. It is obvious to those skilled in the art.

In addition, in the above, when the media resource is externally referred to as using the ULR in which the media resource exists, this means the location where the media resource exists, and can be implemented using the URN as a digital content identification system. Of course, the URL in the present invention refers to including both the URN and other identification schemes.

According to the present invention, by standardizing the location information of the media resource in the MPEG-21 file format, efficient access to and playback of the media resource is possible.

In addition, media resources can be addressed to enable compatible support for MPEG-21 and MPEG-4 files in the ISO media file format.

Claims (16)

In the media resource addressing method of a media file including a metadata area and a media data area including a digital item declaration (DID), Extracting the media resource according to the reference information of the media resource recorded in the DID; Storing the extracted media resource in the media data area; Generating standard location information of the media resource; Storing the generated standard location information in the metadata area; And Filing the metadata area and the media data area Media resource addressing method comprising a. The method of claim 1, The standard location information of the media resource is generated using an offset value of the media data area in which the media resource is stored. The method of claim 1, When the media resource is present in a Motion Picture Experts Group (MPEG-4) file, the standard position information includes an offset value of the MPEG-4 file stored in the media data area and the media in the MPEG-4 file. A media resource addressing method created using location information of a resource. The method of claim 3, Location information of a media resource present in the MPEG-4 file is a track value existing in a metadata area of the MPEG-4 file. The method of claim 3, The location information of the media resource present in the MPEG-4 file is an object descriptor ID (ODID) and an elementary strike ID (ESID) value of the media resource. The method of claim 1, The metadata area further includes a local item area, and the standard location information is stored in the local item area. The method of claim 1, And the media file is an MPEG-21 file. A media resource addressing method of a media file including a metadata area and a media data area including a DID, the method comprising: Reading reference information of a media resource recorded in the DID; If the media resource is present in another media file, reading reference information of the media resource in the other media file; Generating standard location information using reference information of the media resource and reference information in the other media file; Storing the standard location information in the metadata area; And Filing the metadata area Media resource addressing method comprising a. The method of claim 8, When the other media file is an MPEG-4 file, the standard location information is a combination of a URL (Uniform Resource Protocol) in which the MPEG-4 file exists and a track value indicating the media resource in the MPEG-4 file. Media resource addressing method is formed, including. The method of claim 8, If the other media file is an MPEG-4 file, the standard location information is formed by including a combination of the URL where the MPEG-4 file exists and the ODID and ESID value of the media resource. The method of claim 8, When the other media file is an MPEG-21 file, the standard location information is a combination of a URL in which the MPEG-21 file exists and an offset value of a region in which the media resource is stored among media data areas of the MPEG-21 file. Media resource addressing method is formed, including. The method of claim 8, When the other media file is an MPEG-21 file and the media resource is an MPEG-4 file existing in the media data area of the MPEG-21 file, the standard location information includes a URL in which the MPEG-21 file exists; And a combination of an offset value of an area in which the MPEG-4 file is stored among the media data area of the MPEG-21 file and a track value indicating the media resource in the MPEG-4 file. The method of claim 8, When the other media file is an MPEG-21 file and the media resource is an MPEG-4 file existing in the media data area of the MPEG-21 file, the standard location information includes a URL in which the MPEG-21 file exists; And a combination of an offset value of an area in which the MPEG-4 file is stored among the media data area of the MPEG-21 file and an ODID and an ESID of the media resource. A media resource addressing apparatus of an MPEG-21 file including a meta data region including a DID and a media data region, The reference information of the media resource recorded in the DID is read to determine whether the DID refers to the media resource in or out of the file. An output DID reading unit; A media resource extracting unit extracting a media resource based on the reference information output from the DID reading unit and storing the media resource in the media data area; A standard location generator for generating standard location information of the media resource and storing the standard location information in the metadata area; And A filer for fileting the metadata area and the media data area into one file Media resource addressing device comprising a. A recording medium on which a media resource addressing program of an MPEG-21 file including a meta data area including a DID and a media data area is recorded. The media resource addressing program Reading media resource reference information recorded in the DID; When the DID refers to a media resource in a file, the media resource is extracted and stored in the media data area, and standard position information of the media resource is generated using an offset value of the media data area in which the media resource is stored. Function; And A function of generating standard location information of a media resource by using the location information of the media resource when the DID exists in a media resource other than a file; A recording medium on which a media resource addressing program is recorded. The method of claim 15, The media resource addressing program refers to a case in which the DID refers to a media resource other than a file and the media resource is included in another media file. And reading information referring to the media resource from the other media file, wherein the standard location information includes location information of the other media file and location information of the media resource defined within the other media file. The recording medium which records the media resource addressing program produced | generated by combining.

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