KR100811970B1 - Method of providing file by media server - Google Patents

Abstract

Disclosed is a file providing method of a media server. In order to provide a media content file stored to a predetermined playback device connected through a network, the media server first provides URL (Uniform Resource Locator) information of the media content file. This enhances security and enhances search. To this end, the media server encrypts the name and directory of the predetermined media content file included in the URL information by a predetermined encryption method and prefixes the media type. This not only enhances the security of the provided URL information, but also reduces the burden on searching for the playback apparatus by providing an apparatus for searching on the media server side.

Home network, media server, player, URL, objectID

Description

Method of providing file by media server

1 is a block diagram of a home network according to an embodiment of the present invention, and

2 is a diagram showing the structure of a directory provided in the description of the present invention.

The present invention provides security information by encrypting URL information by a predetermined method in providing URL (Uniform Resource Locator) information of the media content file in order to provide a media content file stored to a predetermined playback device connected through a network. The present invention relates to a method of providing a file of a media server, which enhances and enhances a search function.

The present invention relates to a method of creating and managing objectIDs in order to efficiently maintain a virtual directory in managing a media file in a DB in a device that provides a media content file stored to a predetermined playback device connected through a network.

Background Art A media server capable of storing media files such as movies, music, and pictures in a home and serving them to various playback devices connected to a home network system is widely used.

To access the media files stored on these media servers, playback devices use a Uniform Resource Locator (URL) for the media files. To this end, the media server provides URL information about the media file to the playback apparatus. The playback apparatus may infer other URL information not actually provided by the media server through the URL information provided by the media server. However, the occurrence of such a situation is not preferable for security reasons.

In addition, in the directory structure of the storage device included in the media server, various types of media files such as movies, music, and pictures may be mixed together. When users search for a media file of a media server through a playback device, they may only want to search for a particular type of media file.

Although this effect can be achieved by using a filtering method in the playback device, it may be difficult to perform separate processing on the playback device side in that the resource capacity of the playback device is often limited.

SUMMARY OF THE INVENTION An object of the present invention is to provide URL (Uniform Resource Locator) information of a media content file in order to provide a media content file stored to a predetermined playback device connected through a network. In this regard, the present invention provides a media server file providing method for enhancing security and reinforcing search functions.

In order to achieve the above object, a method of providing a file in a media server according to the present invention includes receiving a request for providing information on a predetermined file system including a directory in which at least one media file is stored, from an external device connected through a network; In the case of a media file stored in a specific directory, generating the objectID of the media file by encrypting the name of the media file with a uniform resource locator (URL) of the specific directory by a predetermined encryption method. Instead providing information about the file system including the objectID of the media file to the external device and providing the media file requested by the external device based on the information on the file system. .

Here, the encryption method is preferably based on a hash function algorithm.

Further, when the media file belongs to one of at least one classification according to a predetermined search criterion for retrieving from the at least one media file, the objectID of the media file includes the URL of the specific directory. The classification information to which the media file belongs may be added to the result of encrypting the name.

The method of providing a file of the media server of the present invention may further include generating an objectID of the directory by encrypting the URL of the specific directory by the encryption method. The information about the file system provided to the external device may include the objectID of the directory instead of the URL of the specific directory.

Further, when the media file belongs to one of a plurality of classifications according to a predetermined search criterion for retrieving from the at least one media file, generating the objectID of the directory generates the plurality of objectIDs of the directory. However, each objectID of the plurality of directories may be the plurality of classification information added to the result of encrypting the URL of the specific directory, respectively.

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

1 is a block diagram of a home network according to an embodiment of the present invention.

Referring to FIG. 1, the home network system 100 includes a control device 130, a playback device 150, and a media server 170 connected through a network 110. Although the network 110 of FIG. 1 may include at least one playback device and at least one media server, one playback device 150 and a media server 170 are illustrated for convenience of description.

The media server 170 of the present invention stores at least one media content file (hereinafter, referred to as a "media file") in a directory according to a predetermined file system, and the network 110. The media file stored in the playback apparatus 150 or the like is provided through.

When the media server 170 is requested to provide file system information for providing a media file, the media server 170 provides a URL (Uniform Resource Locator) or a name of a media file of a directory provided to be more secure and easier to search. This improves the vulnerability of the security provided by providing the file system information, and allows the playback device 150 having a weak system resource to easily search for a specific media file.

The network 110 includes a wired or wireless network, and corresponds to a LAN, Bluetooth, Zigbee, or the like. The network 110 of the present invention is preferably based on the Transmission Control Protocol / Internet Protocol (TCP / IP) protocol and the Universal Plug and Play (Upnp) technology.

The control device 130 includes a network interface (not shown) that can be connected to the network 110, and under the control of the user, operations of the media server 170 and the playback device 150 on the home network system 100 are performed. To control. When the home network system 100 supports Upnp, the control device 130 functions as a control pointer. The control device 130 may include a TV (TV) or a wireless PDA (Personal Digital Assistants) having a general remote controller. In addition, the control device 130 may be integrally formed in the media server 170.

When requested by the user, the controller 130 may control the flow of content by invoking various AV transmission actions such as Stop, Pause, Fast Forward (FF), REW (REWind), Skip, and the like. .

The controller 130 may simultaneously perform a role as a master on the network of the home network 110, and in addition to the media server 170 and the playback device 150, various home networks connected to the network 110 ( Data communication between devices (not shown) of 110 may be controlled.

The controller 130 causes the playback apparatus 150 to generate a variety of media files stored in the media server 170, for example, MOVIE, MUSIC, and PHOTO content files. One can be received and played back. Here, the present invention classifies the types of media files into movies, music, and photos, but is not necessarily limited thereto, and may be classified by various methods. However, hereinafter, for the convenience of description, assume a movie, music and pictures as the type of the media file.

The user may find and select desired content in the media server 170, and may use a user interface (UI) of the controller 130 to select a desired playback device from various playback devices.

The controller 130 may obtain a service content list by requesting the media server 170, and the obtained content list information has URL (Uniform Resource Locator) information for accessing the content. The controller 130 informs the playback apparatus 150 of the URL information so that the playback apparatus 150 can directly request the specific content from the media server 170.

The playback device 150 may be connected to the network 110 to receive predetermined media content from the media server 170. The playback device 150 may be a TV, an audio stereo device, an MP3 player, an electronic picture frame, or the like. The playback device 150 corresponds to a media renderer according to the Upnp AV Architecture standard.

The playback device 150 receives the URL information of the media file provided by the media server 170 through the control device 130. The playback device 150 receives a predetermined media file from the media server 170 based on the user's control received from the control device 130 based on the received URL information.

The media server 170 corresponds to a video cassette recorder (VCR), a CD / DVD player, a camera, a camcorder, a PC, a set top box, a satellite receiver, an audio tape player, and the like. When the media server 170 is connected to the network 110 and receives a request for transmitting a specific media file from the playback device 150, the media server 170 transmits the stored media file to the playback device 150. The protocol related to the media server 170 transmitting the media file to the playback device 150 may be HTTP (HyperText Transport Protocol).

To this end, the media server 170 generates the URL information of the stored media file and provides it to the playback device 150 through the control device 130. In generating the URL information of the media file, the media server 170 uses the objectID of the media file and the objectID of the directory in which the media file is stored.

The general syntax of a URL is:

   [/ Media server name / directory name / file name]

Since the URL information is weak in security, the media server 170 generates and provides an objectID encrypted by a predetermined method without providing the URL directly in order to enhance the security of the URL information of a specific media file. do.

The media server 170 generates the objectID of the media file as follows.

First, classify media files by type. The type of media file may include a movie, a music, a photo, or the like. The media server 170 simply determines the type of the media file by using the extension of the media file (for example, mpg, mp3 or jpg, etc.), or reads the header information of the media file to more accurately type it. Can be judged.

Next, the name of the media file including the absolute path of the media file is encrypted using a predetermined encryption technique. Various encryption techniques may be used as such an encryption method, but it is preferable to use a hash algorithm. In the following, for convenience of description, the present invention will be described based on generating objectID using a hash algorithm.

The hash function algorithm used to hash the name of the media file may be a message-digest algorithm 5 (MD5), a secure hash algorithm (SHA) -1, SHA-256, or the like.

Finally, the mediaID file name is encrypted with the prefix ('MOVIE:', 'MUSIC:' or 'PHOTO:') to generate the objectID of the media file.

Therefore, the objectID generation method of the media file may be represented by Equation 1 below.

Here, PREFIX is a prefix for each type of media file, and h () represents a predetermined hash function.

Table 1 below is an example of the objectID generated according to the equation (1).

Name of the media file (including path) Generated objectID /home/media/movie01.mpg MOVIE: <HASH1> /home/media/movie02.mpg MOVIE: <HASH2> /home/media/music01.mp3 MUSIC: <HASH3> /home/media/music01.mp3 MUSIC: <HASH4> /home/media/photo01.jpg PHOTO: <HASH5> /home/media/photo02.jpg PHOTO: <HASH6> /home/media/photo03.jpg PHOTO: <HASH7>

In Table 1, <HASH1> to <HASH7> represent the results of performing the hash function h () as follows.

<HASH1> = h (/home/media/movie01.mpg),

<HASH2> = h (/home/media/movie02.mpg), as well

<HASH7> = h (/home/media/photo03.jpg)

As a result, the media server 170 provides the control device 130 with URL information including the objectID as shown in Equation 1 below. The objectID of the generated media file makes it difficult to infer the URL of another media file existing on the media server 170.

As described above, the path is represented by attaching the path on the file system of the media server 170 to the host name of the media server 170. If the movie01.mpg is transmitted as it is, the URL information on the movie01.mpg is transmitted. The acquired user is likely to infer that there will be a media called movie02.mpg.

However, if the media server 170 provides "MOVIE: <HASH1>" instead of movie01.mpg according to the present invention, even if the user has the URL information about movie01.mpg, it is possible to infer the URL information of movie02.mpg. Becomes difficult.

In addition, the media server 170 displays a directory on its file system in order to provide a convenience of searching by classifying the media files owned by the type in the process of searching for the media file with the security of URL information. Create an objectID using the following method.

First, hash the absolute path of the directory where the media file is stored. This hash method may be the same as the hash of the media file name.

Subsequently, as a result of hashing the directory name, prefixes ('MOVIE:', 'MUSIC:', and 'PHOTO:') corresponding to all media file types are generated to generate as many directory objectIDs as the media file types. For example, in the case of separating media content into music, movies, and photos, three objectIDs for one directory are used. The three objectIDs for these directories become 'virtual directories' for searching.

When the controller 130 searches for a specific type of media file stored in the media server 170, the media server 170 presents a predetermined directory structure based on its file system. In this case, since it is not possible to know in advance what type of media file will exist under the directory, the media server 170 prefixes all media types to the objectID of the directory name, unlike the media file.

For example, assume that the music content file '/home/media/abc.mp3' has objectID 'MUSIC: DFCD3454'. However, the directory '/ home / media' will have three objectIDs: 'MOVIE: 52ED879E', 'MUSIC: 52ED879E', and 'PHOTO: 52ED879E'. Where DFCD3454 = h ("/ home / media / abc.mp3") is the hash value of the media file name and 52ED879E = h ("/ home / media") is the hash value of the directory name '/ home / media' to be.

When the media server 170 provides only the URL information for the music file, the media server 170 shows only the content with the prefix "MUSIC:", so that only the music type file can be searched. However, directories should always be visible regardless of the type they are searched for. This is because all types of content files can exist under one directory. Therefore, creating a virtual directory.

For example, when the directory '/ home / media / noname' and the '/home/media/abc.mp3' content file exist under the '/ home / media' directory of the file system of the media server 170, ' Searching for music files under / home / media 'should search the music directory (actually noname) and the abc.mp3 file.

On the other hand, if you search for a picture file under '/ home / media', you should search for '/ home / media / noname'. Since the photo file '/home/media/noname/abc.jpg' may exist under the noname directory, a directory called noname must be displayed for the user to search for the above Joint Photographic Coding Experts Group (JPEG) image. Therefore, the media server 170 creates a virtual directory objectID for the noname directory.

2 is a diagram showing the structure of a directory provided in the description of the present invention, where (a) is a structure of an actual directory, and (b) is a structure of a virtual directory corresponding to the actual directory.

Referring to (a), the directory / home / media / is located under the root directory '0' on the file system of the media server 170, and the media files of Table 1 exist below it.

If the hash value of the directory name / home / media / is <HASH0>, the hash of the relation between the objectID "MOVIE: <HASH1>" of one of the directory's objectIDs and the objectID "MOVIE: <HASH1>" of the media file Because of the nature of the function, the media server 170 needs to maintain an objectID table representing the relationship in the database.

Hereinafter, the objectID of the virtual directory for a specific type of media file is called parentID. Among MUSIC: <HASH0>, MOVIE: <HASH0>, and PHOTO: <HASH0>, MOVIE: <HASH0> becomes the parentID of MOVIE: <HASH1>.

Table 2 shows an example of the objectID table according to the directory structure of FIG.

objectID parentID MOVIE: <HASH1> MOVIE: <HASH0> MOVIE: <HASH2> MOVIE: <HASH0> MUSIC: <HASH3> MUSIC: <HASH0> MUSIC: <HASH4> MUSIC: <HASH0> PHOTO: <HASH5> PHOTO: <HASH0> PHOTO: <HASH6> PHOTO: <HASH0> PHOTO: <HASH7> PHOTO: <HASH0>

When the media server 170 provides search information of a predetermined media file to the control device 130 or the like according to the directory structure of FIG. 2, a specific objectID exists under a specific parentID based on the objectID table shown in Table 2 below. It can be displayed.

Therefore, the virtual directory structure proposed corresponding to the actual directory structure as shown in (a) becomes as shown in (b).

Accordingly, even a plurality of types of media files existing under one real directory are provided, which can be classified and displayed according to each media type. Therefore, even when system resources of the playback device 150 are limited, the media server 170 provides a search function in advance, thereby enabling effective media file search.

When the media server 170 provides the URL information to the control device 130, the media server 170 includes the media content information along with the objectID of the media file and the objectID of the directory. The information on the content corresponds to the actual title or artist name of the corresponding content such as the name of the music file.

For example, the abc.avi file can be expressed in the following way.

<item id = "MOVIE: <HASH1>" parentID = "MOVIE: <HASH0>" restricted = "false">

<dc: title> Once upon a time in America </ dc: title>

<dc: creator> someone </ dc: creator>

<upnp: class> object.item.videoItem.movie </ upnp: class>

<res protocolInfo = "http-get: *: video / mpeg: *">

 http: // upnp-media-server / MOVIE: <HASH1>

</ res>

</ item>

Through this, the control device 130 may receive the URL information including the objectID of the media file and the objectID of the directory from the media server 170 and display the same to the user according to the user's request. In this case, the controller 130 provides the user with a predetermined user interface based on the content information included in the URL information.

The above virtual directory and parentID provide search function based on the actual directory structure. However, it does not have to target the actual directory structure. According to another embodiment of the present invention, the virtual directory and the parentID may be generated based on search criteria other than the actual directory structure.

The invention can be implemented in methods, devices and systems. In addition, when the present invention is implemented in computer software, the components of the present invention may be replaced with code segments necessary for performing necessary operations. The program or code segment may be stored in a medium that can be processed by a microprocessor and transmitted as computer data coupled with carrier waves via a transmission medium or communication network.

The media that can be processed by the microprocessor include electronic circuits, semiconductor memory devices, ROMs, flash memory, electrically erasable programmable read-only memory (EEPROM), floppy disks, optical disks, and hard disks. (Hard) Includes the ability to transmit and store information such as disks, fiber optics, wireless networks, and the like. Computer data also includes data that can be transmitted over electrical network channels, optical fibers, electromagnetic fields, wireless networks, and the like.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the above-described specific embodiment, the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described in detail above, the media server according to the present invention first provides uniform resource locator (URL) information of the media content file to provide the stored media content file to a predetermined playback device connected through a network. Therefore, the security is enhanced by encrypting the URL information by a predetermined method. In other words, it is not possible to infer the existence of other media files stored in the media server based on the URL information provided by the user of the playback device or other user on the network.

In addition, the media server includes the media file type information in the encrypted media file name and the directory information provided to provide a powerful search function for the media device by the control device or playback device connected through the network. Can be. This is more useful for playback devices with less system resources.

Claims (5)

Receiving, from an external device connected through a network, provision of information on a file system including a directory in which at least one media file is stored; In the case of a media file stored in a specific directory, generating an objectID of the media file by encrypting a name of the media file by a predetermined encryption method together with a Uniform Resource Locator (URL) of the specific directory; Providing information about the file system including the objectID of the media file to the external device in place of the name of the media file; And Providing a media file requested by the external device based on the information on the file system. The method of claim 1, The encryption method is a file providing method of a media server, characterized by a hash function algorithm. The method of claim 1, When the media file belongs to one of at least one classification according to a search criterion for retrieving from the at least one media file, The object ID of the media file is a file providing method of a media server, characterized in that classification information to which the media file belongs is added to a result of encrypting the name of the media file including the URL of the specific directory. The method of claim 1, Generating the objectID of the directory by encrypting the URL of the specific directory by the encryption method; And the information on the file system provided to the external device includes the objectID of the directory instead of the URL of the specific directory. The method of claim 4, wherein When the media file belongs to one of a plurality of categories according to a search criterion for retrieving from the at least one media file, The generating of the objectID of the directory may include generating the plurality of objectIDs of the directory, wherein each of the objectIDs of the plurality of directories has the plurality of classification information added to the result of encrypting the URL of the specific directory. File providing method of the media server.

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