KR20070038769A - Apparatus and method for a playlist construction of dlna home network - Google Patents

Abstract

The apparatus and method for constructing a playlist of a DLNA home network according to the present invention may be independent of a content format in constructing a playlist by allowing a control point to construct various playlists according to a user's request. The included content can be organized into a playlist.

In addition, the apparatus and method for constructing a playlist of a DLNA home network according to the present invention may manage playlists at a control point performing direct communication with a user, and are included in the playlist in playing the playlist at the control point. It is possible to provide convenience to the user by analyzing whether the content item list exists in the DMS and notifying the user through an output terminal such as a display screen or a speaker.

Description

APPARATUS AND METHOD FOR A PLAYLIST CONSTRUCTION OF DLNA HOME NETWORK}

1 illustrates a general DLNA layer.

2 is a diagram illustrating a playlist configuration method of a DLNA home network according to the prior art;

3 is a diagram illustrating an example of a playlist configured in a DLNA home network according to the prior art;

4 is a diagram illustrating a configuration of a DLNA home network according to an embodiment of the present invention.

5 is a block diagram of a control point according to an embodiment of the present invention.

FIG. 6 illustrates a playlist composed of XML in a DLNA home network according to an embodiment of the present invention. FIG.

7 is a flowchart illustrating a playlist configuration method of a DLNA home network according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100: DMS 200: DMP

300: DMR 400: control point

The present invention relates to an apparatus and method for constructing a playlist of a DLNA home network.

The DLNA (Digital Living Network Alliance) is the official partnership for the commercialization of home networks, and was newly launched under the name of the Digital Home Working Group (DHWG), which was launched in June 2003.

DLNA aims to build interoperable platforms based on open industry standards that are already in place and to achieve industry convergence. Such DLNA is promoting the introduction of guidelines by companies based on UPnP, which is widely used by manufacturers of home appliances, personal computers (PCs), and wireless devices.

Here, UPnP (Universal Plug and Play) is a technology that enables communication between information appliances connected to a network without complicated setting procedures, and allows other devices to automatically find a service owned by one device.

Meanwhile, the guidelines currently introduced in DLNA provide design principles for sharing content between different brands and products through wired and wireless home networks between home appliances, PCs and wireless devices. As a result, products designed according to the guidelines will be able to share media content, such as music, photos, and videos, over a home network.

Hereinafter, the DLNA technology will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a general DLNA layer.

As shown in FIG. 1, DLNA is divided into six layers.

The first layer is a network connection layer and uses 802.11a / b / g for wireless connection and 802.3i and 802.3u for wired connection.

The second layer uses the IPv4 protocol as a network stack layer.

The third layer uses HTTP 1.0 / 1.1 as the media transport layer.

Layers 4 and 5 are device discovery, control, and media management layers, layer 4 uses UPnP device architecture, and layer 5 uses UPnP audio / video. Doing.

The sixth layer uses image, audio, and AV as a media format layer.

Here, the UPnP AV specification of the fifth layer defines two device models of a media server and a media renderer.

A media server is a device for providing content on a network, and a media renderer is a device for playing content received from a network.

In addition, UPnP AV controls a media server and a media renderer by configuring a control point, which is a device having a capability of searching for and controlling other devices.

On the other hand, the UPnP AV standard defines four services: Connection Manager Service, Rendering Control Service, AV Transport Service, and Content Directory Service. have.

Here, the connection management service selects the format and protocol, and allows the Control Point to use and manage the relationship between the source and the sink of the content. Connection management services also ensure that the control point does not need to know the physical media connection technology and allows the control point to choose a source and a sink to play that source.

The rendering control service controls the sound and image characteristics. Most playback devices provide configuration properties that affect content playback. The rendering control service provides the control point with the ability to adjust these playback properties.

The AV transport service controls playback and recording. The AV transport service provides a mechanism for the control point to control the transmission of audio and video streams through operations such as play, stop, pause, and so on.

The content directory service is a service that displays a list of content and metadata. The content directory is a service that control points use to retrieve and store audio and video content. The content directory can list many media types, including songs in an MP3 player, slides with still images, movies in a DVD-Jukebox, and TV schedules.

The DLNA home network uses a content directory service among the UPnP AV services to search for contents included in devices connected to the DLNA home network to construct a playlist.

2 is a diagram illustrating a playlist configuration method in a DLNA home network according to the prior art.

As illustrated in FIG. 2, in the DLNA home network, a playlist is constructed by searching for content included in the media server 10 using the control point 20.

The control point 20 first searches for the contents contained in the media server 10 on the DLNA home network as a content directory service (S11).

When the control point 20 performs a content search, the media server 10 constructs a content item list result set suitable for a predefined form by using an object creation action (CreatObject action) (S12). Here, the 'content item list' means a list in which the media server 10 lists the items of the contents included in the media server 10 in response to the content search of the control point 20.

If the media server 10 configures the content item list result set, the media server 10 transmits the result set to the control point 20 (S13).

If the control service 20 receives a content item list result set from the media server 10, the control service 20 receives at least one or more contents of the input content item list from the user. The control point 20 transmits the content item list selected by the user to the media server 10 as an object generation argument along with the container ID for generating the object (S14). The container ID is an ID value required for specifying which container, that is, a directory, an object the user wants to create in the media server 10.

The media server 10 generates a playlist file according to the container ID received from the control point 20 and transmits the generated playlist file to the control point 20 (S15).

3 is a diagram illustrating an example of a playlist configured in a DLNA home network according to the prior art.

As shown in FIG. 3, a playlist configured in a DLNA home network may be configured in only one format.

In FIG. 3, the mp3 format is used as an example.

In FIG. 3, 'Alternative' and 'classical' represent subdirectories within a default directory. 'Song.mp3' and 'New_Song.mp3' are the names of mp3 entries in the actual playlist stored in the 'Alternative' and 'classical' directories, respectively.

And, in case of 'Crap.mp3' where the directory path previously stored is not specified, the path of the line is followed.

'Food_Bar.mp3' is located in a directory designated independently regardless of the default path, and 'Mine.mp3' represents an mp3 file on a web server.

On the other hand, the DLNA home network constituting the playlist in this way has a problem that the playlist can be configured only for a predefined media format.

Therefore, the user can only compose a playlist for a specific content format, and cannot compose a playlist for a content format that is not predefined.

In addition, in the DLNA home network, when the playlist is configured, the playlist is configured in the media server, so that a content in the plurality of media servers cannot be created as one playlist.

This is because, when the contents in the plurality of media servers are configured as one playlist, each media server must manage contents other than its own contents.

Accordingly, an object of the present invention is to provide an apparatus and method for constructing a playlist of a DLNA home network for configuring playlists of various media formats of the DLNA home network. have.

According to an aspect of the present invention, a Digital Living Network Alliance (DLNA) home network stores at least one content and satisfies a request condition of the content search request signal upon receiving a content search request signal. At least one digital media server providing a content item list result set that lists the items of the content; When a content search request signal is transmitted to at least one of the digital media servers, and a content item list result set corresponding to the content search request signal is received from the digital media server, at least one content item of the content item list is played. Contains control points that organize and store lists.

The content search request signal includes at least one of a search signal for a specific media format and a search signal for all media formats.

The content search request signal has a specific digital media server or an entire digital media server among the digital media servers as a content search range.

The content item list result set includes location information of each content item included in the content item list.

The content item list result set is configured in the form of Extensible Markup Language (XML).

When the control point receives the content item list result set from the digital media server, the control point displays a content item list of the received result set on a display screen, and displays at least one content item of the displayed content item list. The selected item is selected by the user, and the selected item is configured as the playlist.

When the control point receives a reproduction of the stored playlist from the user, the control point transmits a confirmation signal for existence of content items included in the playlist to the digital media server, and then confirms the existence of the content items. The resultant signal is received from the digital media server to play the existing content item, and the absence is notified through the output terminal of the nonexistent content item.

The existence confirmation request signal of the content items consists of an HTTP-GET message.

The HTTP-GET message includes location information of each content item included in the playlist.

The output terminal includes at least one of a display screen and a speaker.

When the digital media server receives the HTTP-GET message from the control point, the digital media server checks whether the content items exist in the corresponding location by using the location information of each of the content items included in the received HTTP-GET message. After that, the presence confirmation result of the content items is transmitted to the control point.

In addition, the apparatus for configuring a playlist of a DLNA home network according to another aspect of the present invention for achieving the above object, transmits a content search request signal to at least one of the digital media server on the DLNA home network, and from the digital media server And receiving a content item list result set corresponding to the content search request signal, and configured to store at least one content item in the content item list as a playlist.

When the content item list result set is received from the digital media server, the controller displays a content item list of the received result set on a display screen, and displays at least one content item of the displayed content item list. Selected by the user, the selected item is configured as the playlist.

The control unit, upon receiving the playback of the stored playlist from the user, transmits an existence confirmation request signal of the content items included in the playlist to the digital media server, and then confirms the existence of the content items. Receive a signal from the digital media server to play the existing content item and notify the absence of the content item that does not exist.

On the other hand, according to another aspect of the present invention for achieving the above object playlist configuration method of the DLNA home network, transmitting a content search request signal to at least one of the digital media server on the DLNA home network; Receiving a content item list result set corresponding to the content search request signal from the digital media server, and displaying the received content item list; Receiving at least one content item from the displayed content item list by the user, and storing the selected content item as a playlist.

In addition, the playlist configuration method of the DLNA home network comprises the steps of: receiving the stored playlist play from the user; Transmitting a request for confirmation of existence of content items included in the playlist to the digital media server when the playlist play is received; If the resultant signal corresponding to the existence confirmation request signal of the content items is received from the digital media server, playing the content item existing in the digital media server, and outputting the absence of the content item not present. It includes more.

Hereinafter, an apparatus and method for constructing a playlist in a digital living network alliance (DLNA) home network according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a configuration of a DLNA home network according to an embodiment of the present invention.

As shown in FIG. 4, the DLNA home network may be configured to include a DMS 100, a DMP 200, a DMR 300, and a control point 400.

In the UPNAP-based DLNA, a device class is set for each device. The components of FIG. 4 are classified and named according to the device class. Device classes are classified according to which functions they support regardless of their physical characteristics. Since a device may provide various functions, a device may belong to several device classes.

The digital media server (DMS) 100 is a device for a server in which a UPnP media server is embedded, and can provide media on a DLNA home network.

The digital media player (DMP) 200 may provide a function of selecting and controlling media on a DLNA home network and playing back the selected media. Such a DMP 200 may be a combination of the functions of the DMS 100 and the control point 400.

Meanwhile, in the DLNA home network, the DMS 100 and the DMP 200 may coexist in one device.

 The DMR (Digital Media Renderer) 300 is a device for playing content received from a home network.

As described above, the control point 400 refers to a device having the ability to search for and control other devices. The control point 400 usually takes the form of a portable terminal supporting mobility for free control and management of a user (for example, a remote controller), but it is excluded that the control point 400 is connected to other devices in the home network by wire. no.

In addition, the types of DLNA devices classified according to functions and physical characteristics may include a DVD player, a TV, a DVR, a mobile phone, a printer, a camera, and the like. These various types of devices may be the DMS 100, the DMR 300, the DMP 200, and the control point 400 according to the service type thereof. For example, the mobile phone may function as the control point 400, and the TV and the DVR may function as the DMS 100 or the DMR 300.

The DLNA home network having such a configuration may be configured to configure the playlist directly at the control point 400 in constructing the playlist using the content directory service.

Hereinafter, a method of configuring a playlist of a DLNA home network will be described in detail with reference to the accompanying drawings.

On the other hand, since the DMP 200 includes the function of the control point in its function, the functions and operations of all the control points described below may be the same in the DMP 200.

5 is a block diagram of a control point according to an embodiment of the present invention.

As shown in FIG. 5, the control point 400 may be configured to include a transceiver 410, a controller 420, a storage 430, a display 440, and an input unit 450.

In the control point 400, the transceiver 410 may perform wireless communication using 802.11a / b / g or wired communication using 802.3i / 802.3u with the devices configuring the DLNA home network.

The controller 420 may search for contents in devices configuring a DLNA home network using a content directory service, and configure a playlist according to the content search. In addition, the controller 420 may control the overall operation of the control point 400.

The storage unit 430 may store a program for operating the playlist and the control point 400.

The display unit 440 may display signals output from the controller 420 on a display screen.

The input unit 450 may receive a content search request, a playlist configuration request, or the like from a user.

Referring to the playlist configuration operation of the control point 400 having such a configuration, first, the input unit 450 of the control point 400 may receive a content search request from the user.

In this case, the input unit 450 may receive various formats such as a specific media format, all audio formats, all media formats, etc. from the user in the content search request. In addition, in the content search request, the input unit 450 may receive various content search ranges such as a specific DMS 100 on the DLNA home network and the entire DMS 100. In FIG. 5, for example, it is assumed that the input unit 450 receives a content search signal for all DMSs 100 and all media formats on a DLNA home network.

When the input unit 450 receives a content search request from the user, the input unit 450 may output a content search request signal to the controller 420.

When the controller 420 receives the content search request signal from the input unit 450, the controller 420 analyzes the input content search request signal and then transmits the content search signal to the DMS 100 on the DLNA home network using the transceiver 410. can do. Herein, the control unit 420 may invoke a command such as a browser or a search to transmit a content search request signal.

Meanwhile, the transceiver 410 may transmit the content search request signal to the DMS 100 by the controller 420 and then receive each media item list result set from all the DMSs 100 on the DNLA home network. The 'media item list' refers to a list in which the DMS 100 lists the items of all the media included in the media in response to the content search request signal of the control point 400.

Here, the result set may be configured in various forms, and in the present invention, for example, the result set may be configured in Extensible Markup Language (XML) form. XML is a next-generation Internet language that improves the Hypertext Markup Language (HTTP) that composes the Internet Web. It has the advantage that users can manipulate structured databases at will. The result set may include location information of the media item list.

When the transceiver 410 receives each result set from all the DMSs 100 on the home network, the transceiver 410 may output all received result sets to the controller 420.

When the result set is received from the transmitter / receiver 410, the controller 420 may output and display a media item list of all the result sets received on the display 440.

Meanwhile, when the media item lists are displayed, the input unit 450 may receive a selection of specific media items among all displayed media item lists from the user. Here, the input unit 450 may receive media items for all formats requested by the user as well as a predefined media format.

When the input unit 450 receives specific media items from the user, the input unit 450 may output the received specific media items to the controller 420.

When the controller 420 receives specific media items received from the user from the input unit 450, the controller 420 may configure the received specific media items as a playlist. In the playlist configuration, the controller 420 may extract XML contents of specific media items received from a user and configure a playlist of an XML document according to one fixed format XML schema.

When the controller 420 configures the playlist of the XML document, the controller 420 may parse the data and store it in the storage unit 430 as a file in the form of an object.

The control point 400 may configure at least one playlist in this manner and store it in the storage 430. The control point 400 configures at least one playlist and stores the playlist in the storage unit 430, and then receives a playlist play from the user through the input unit 450.

When the input unit 450 receives an arbitrary playlist play from the user, the input unit 450 may output an arbitrary playlist play signal to the controller 420.

When the controller 420 receives a playlist play from the user, the controller 420 may transmit an HTTP-GET message for the playlist play request to the DMS 100 using the transceiver 410.

In general, an 'HTTP-GET message' is a message for a client to request data from a server, and is used when a general HTML document, an image, a video, etc. are requested to the server.

Meanwhile, the HTTP-GET message may include location information of playlists.

The control unit 420 may transmit an HTTP-GET message to the DMS 100 and then receive a playback of media items of the corresponding playlist from the DMS 100 through the transceiver 410. When the controller 420 receives the playback of the media items, the controller 420 may output the input media items to the display unit 440.

Meanwhile, the controller 420 inputs an absence message from the DMA 100 through the transceiver 410 to the media items deleted or moved from the DMS 100 after the playlist play request to the DMS 100. I can receive it. When the control unit 420 receives the absence message, the control unit 420 may output the absence of the corresponding media item to the display unit 440 to notify the user.

As such, the control point 400 may use a content directory service in a DLNA home network to construct a universal playlist according to a user's request regardless of a media format, and is not limited to a specific DMS 100. Content included in the 100 may be configured as a playlist.

On the other hand, the term 'general purpose' means a general purpose within a range that is compatible with AV content sharing between devices in a DLNA home network and does not deviate from the DLNA standard.

6 is a diagram illustrating a playlist composed of XML in a DLNA home network according to an embodiment of the present invention.

As shown in FIG. 6, the playlist may be composed of XML.

As such, when the playlist is configured in the XML format, the control point 400 may be convenient to configure the playlist. The reason for this is that in a DLNA home network, a device has an XML parser for exchanging a message format composed of XML between devices. For another reason, since the media list that the DMS 100 transmits to the control point 400 in response to the content search request signal of the control point 400 is in XML form, the playlist in the XML form may be implemented without modification. Because it can.

Next, the operation of the control point 400 and the DMS 100 for configuring a playlist of the DLNA home network will be described with reference to the accompanying drawings.

7 is a flowchart illustrating a playlist configuration method of a DLNA home network according to an embodiment of the present invention.

As illustrated in FIG. 7, the control point 400 may receive a content search request from a user (S101).

In this case, the control point 400 may receive various formats such as a specific media format, all audio formats, all media formats, etc. from the user in the content search request. In addition, in the content search request, the control point 400 may receive various content search ranges such as a specific DMS 100 on the DLNA home network and the entire DMS 100. In FIG. 7, for example, it is assumed that the control point 400 receives the content search signal for the entire DMS 100 and all the media formats on the DLNA home network.

When the control point 400 receives a content search from the user, the control point 400 may transmit a content search request signal to all the DMSs 100 on the DLNA home network as a content directory service (S102).

When all the DMSs 100 on the DLNA home network receive a content search request signal from the control point 400, the DMS 100 configures a media item list result set according to all the media formats included by using the content directory service to control the control point 400. (S103). Herein, the result set may be configured in various forms, and FIG. 7 illustrates that the result set is configured in XML (Extensible Markup Language) form. Meanwhile, the result set may include location information of the media item list.

When the control point 400 receives the respective media item list result sets from all the DMSs 100 on the DLNA home network, the control point 400 may display all the received media item lists on the display screen (S104).

After the media item lists are displayed, the control point 400 may receive a selection of specific media items from the entire list of media items displayed by the user (S105). Here, the control point 400 may receive media items for all formats requested by the user, rather than a limited format.

When the control point 400 receives specific media items from the user, the control point 400 may extract the XML contents of the received media items and generate a playlist of the XML document (S106).

When the control point 400 generates the playlist of the XML document, the control point 400 may parse the data and store it as a file in the form of an object (S107).

The control point 400 may configure and store at least one playlist through the above method. The control point 400 may configure and store at least one playlist, and then receive an arbitrary playlist play from the user (S108).

If the control point 400 receives an arbitrary playlist play from the user, the control point 400 may transmit an HTTP-GET message to the DMS 100 for the playlist play request (S109). Here, the HTTP-GET message may include location information of playlists.

When the DMS 100 receives the HTTP-GET message from the control point 400, the media items of the playlist are included in the DMS 100 by using the location information of the playlists included in the received HTTP-GET message. It can be determined whether or not it exists at the location. As a result of the determination, the DMS 100 may perform a content stream on the control point 400 with respect to items existing at the corresponding position in the DMS 100. However, the DMS 100 transmits a Not Exist message to the control point 400 for media items that do not exist at the corresponding location in response to the location information included in the HTTP-GET message, for reasons of deletion or movement. It may be (S110).

When the media item existing in the DMS 100 of the playlist is streamed from the DMS 100, the control point 400 may play the streamed media item (S111). However, when the absence message is received from the DMS 100, the control point 400 may notify the user of the absence of the corresponding media item through an output means such as a display screen or a speaker.

As such, the DLNA home network composed of the control point 400 and the DMS 100 may use the content directory service to configure a universal playlist regardless of the media format at the control point 400, and may include a specific DMS ( The contents included in the plurality of DMSs 100 may be configured as one playlist, without being limited to 100).

The apparatus and method for constructing a playlist of the DLNA home network according to the present invention as described above may allow the control point to configure various playlists according to a user's request, and thus, regardless of the content format in constructing the playlist, Content included in the plurality of DMSs may be configured as a playlist.

In addition, the apparatus and method for constructing a playlist of a DLNA home network according to the present invention may be included in a playlist for managing a playlist at a control point performing direct communication with a user, and playing the playlist at the control point. It is possible to provide convenience to the user by analyzing whether the content item list exists in the DMS and notifying the user of the result according to the presence through an output terminal such as a display screen or a speaker.

Claims (24)

In the Digital Living Network Alliance (DLNA) home network, At least one digital media server storing at least one content and providing a content item list result set listing items of content satisfying a request condition of the content search request signal when the content search request signal is received; Wow When a content search request signal is transmitted to at least one of the digital media servers, and a content item list result set corresponding to the content search request signal is received from the digital media server, at least one content item of the content item list is played. DLNA home network with control points that organize and store lists. The method of claim 1, The content search request signal, DLNA home network comprising at least one of a search signal for a particular media format and a search signal for all media formats. The method of claim 1, The content search request signal, DLNA home network having a specific digital media server or the entire digital media server of the digital media server as the content search range. The method of claim 1, The content item list result set is DLNA home network including location information of each content item included in the content item list. The method of claim 1, The content item list result set is DLNA home network in XML (Extensible Markup Language) format. The method of claim 1, The control point, When the content item list result set is received from the digital media server, the content item list of the received result set is displayed on a display screen, and at least one content item of the displayed content item list is selected from the user. A DLNA home network which receives the selected item and configures the selected item into the playlist. The method of claim 1, The control point, When the reproduction of the stored playlist is received from the user, the existence confirmation signal of the content items included in the playlist is transmitted to the digital media server, and then the existence confirmation result signal of the content items is transmitted to the digital media server. DLNA home network, which plays from a content item received from a media server, and announces absence through an output terminal for content items that do not exist. The method of claim 7, wherein The existence confirmation request signal of the content items, DLNA home network consisting of HTTP-GET messages. The method of claim 8 The HTTP-GET message is, DLNA home network including location information of each content item included in the playlist. The method of claim 7, wherein The output stage, DLNA home network comprising at least one of a display screen and a speaker. The method of claim 9, The digital media server, When receiving the HTTP-GET message from the control point, by using the location information of each of the content items included in the received HTTP-GET message to check whether the content items exist in the location and the presence of the content items DLNA home network to send a verification result to the control point. In the playlist configuration device of the DLNA home network, Transmitting a content search request signal to at least one of the digital media servers on the DLNA home network, and if a content item list result set corresponding to the content search request signal is received from the digital media server, at least one of the content item lists. And a control unit for organizing and storing items into playlists. The method of claim 12, The content search request signal, And at least one of a search signal for a specific media format and a search signal for all media formats. The method of claim 12, The content search request signal, And a specific digital media server or an entire digital media server among the digital media servers as a content search range. The method of claim 12, The content item list result set is Apparatus for constructing a playlist of a DLNA home network including location information of each content item included in the content item list. The method of claim 12, The control unit, When the content item list result set is received from the digital media server, a content item list of the received result set is displayed on a display screen, and at least one content item of the displayed content item list is selected from the user. And a playlist configuration device of the DLNA home network configured to configure the selected item as the playlist. The method of claim 12, The control unit, When the reproduction of the stored playlist is received from the user, the existence confirmation signal of the content items included in the playlist is transmitted to the digital media server, and then the existence confirmation result signal of the content items is transmitted to the digital media server. A device for constructing a playlist in a DLNA home network, which performs playback on a content item received from a media server and announces absence for a content item that does not exist. In the playlist configuration method of the DLNA home network, Transmitting a content search request signal to at least one of the digital media servers on the DLNA home network; Receiving a content item list result set corresponding to the content search request signal from the digital media server, and displaying the received content item list; And  And selecting at least one content item from the displayed content item list from the user, and storing the selected content item as a playlist. The method of claim 18, The content item list, And the digital media server lists the items of content satisfying the request condition of the content search request signal of the control point. The method of claim 18, The content search signal, A method of constructing a playlist of a DLNA home network, comprising at least one of a search signal for a particular media format, a search signal for all audio formats, and a search signal for all media formats. The method of claim 18, The content search request signal, And a specific digital media server or an entire digital media server of the digital media server as a content search range. The method of claim 18, The result set is And a play list structure of a DLNA home network including location information of the content item list. The method of claim 18, Receiving the stored playlist play from the user; Transmitting a request for confirmation of existence of content items included in the playlist to the digital media server when the playlist play is received; And If the resultant signal corresponding to the existence confirmation request signal of the content items is received from the digital media server, playing the content item existing in the digital media server, and outputting the absence of the content item not present. Playlist configuration method of the DLNA home network further comprising. The method of claim 22, The request for the presence of the content items, How to configure playlist of DLNA home network consisting of HTTP-GET message.

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