JP4482828B2 - REPRODUCTION DEVICE AND METHOD, INFORMATION PROCESSING DEVICE AND METHOD, INFORMATION PROVIDING SYSTEM, AND DATA - Google Patents

Description

The present invention relates to a playback device and method, an information processing device and method, an information providing system, and data . The present invention relates to an information processing apparatus and method, an information providing system, and data .

  One of DVD (Digital Versatile Disc) playback-only standards is the DVD video format. In this DVD video format, content data such as video and audio is multiplexed together with various sub-picture data such as subtitles, and recorded as a program stream on a disc. In addition, navigation data for interactively reproducing the stream is recorded on the disc.

  Here, interactive playback refers to playback from a preferred position and playback in a preferred order, as well as a multi-angle function that enables playback of video shot from various angles, and preference from multiple languages. This refers to playback performed by the user using various functions of the DVD, such as a multi-language function that enables playback in any language, and a barrent control function that prevents playback of certain scenes such as violent scenes.

  The program stream can also multiplex a plurality of audio streams and a plurality of sub-picture streams. As a result, for example, for a single video content such as a movie, it is possible to record audio and subtitle data in a plurality of different languages on one disc, and the user can start playback or during playback of video. In addition, it is possible to select audio and subtitles in a preferred language.

By the way, Patent Document 1 discloses a system that allows a user to easily download contents such as sound effects, moving images, and still images that are materials of a video work. Further, Patent Document 2 discloses a technology that can replace a part of music data with other data.
JP 2003-140662 A JP 2002-31967 A

  However, there is a problem that the user can only reproduce the content recorded on the disc attached to the player.

  Therefore, for example, when a disc on which movie content with only English audio is recorded is purchased, the user may watch a movie with Japanese audio or display a video depending on the disc. Japanese subtitles cannot be displayed.

  Also, if the disc seller wants to sell discs with movie content recorded in multiple countries with different languages, prepare discs with audio and subtitle data for each language. Or, it is necessary to prepare a plurality of types of discs such as English discs and Japanese discs. Therefore, it takes time to prepare such a disk, and in some cases, a large business opportunity is lost.

  The present invention has been made in view of such a situation, and by enabling the user to download an update file of content recorded on the disc, the user can download the content recorded on the disc, It is intended to be used relatively freely according to your preference.

  The playback apparatus of the present invention plays back the first AV stream recorded in the first directory structure based on the first control information for controlling the playback of the first AV stream, and the first A second AV stream recorded in a second directory structure different from the first directory structure, and a first AV stream for controlling reproduction of the first AV stream and the second AV stream. Generating means for merging the control information of the first directory structure to generate a virtual file system having the first directory structure, wherein the reproducing means and the virtual file system generated by the generating means Based on the control information, the first AV stream and the second AV stream are reproduced.

  The first directory structure may be a directory structure for a detachable recording medium, and the second directory structure may be a directory structure for managing a plurality of the detachable recording media.

  Acquisition means for acquiring the second AV stream and the second control information from the outside can be further provided.

  Recording means for recording the second AV stream and the second control information acquired by the acquisition means in the second directory structure can be further provided. In this case, the acquisition unit can acquire the clip information file corresponding to the second AV stream, and the acquired clip information file can be recorded on the recording unit.

  The first control information and the second control information are playlist files, and the first control information includes at least a play item for managing reproduction of the first AV stream, and the second control information The playlist file corresponding to the information can include at least a play item for controlling reproduction of the first AV stream and a sub play item for controlling reproduction of the second AV stream.

  Acquisition means for acquiring the second AV stream and the second control information from the outside, and the second AV stream and the second control information acquired by the acquisition means in the second directory structure Recording means for recording can be further provided. In this case, the generation means further merges the clip information file corresponding to the first AV stream and the clip information file corresponding to the second AV stream to generate the virtual file system, and The playlist file corresponding to the second control information corresponds to the clip information file corresponding to the first AV stream on the virtual file system and the second AV stream on the virtual file system. It is possible to make the file include information specifying the clip information file.

  In the playback method of the present invention, the playback means plays back the first AV stream recorded in the first directory structure based on the first control information for controlling the playback of the first AV stream, and the first AV stream is recorded. A second AV stream recorded in a second directory structure different from the first directory structure, and a first AV stream for controlling reproduction of the first AV stream and the second AV stream. 2 is merged to generate a virtual file system having the first directory structure, and the reproducing means is configured to generate the first file based on the generated virtual file system and the second control information. Playing back an AV stream and the second AV stream.

  A first information providing system according to the present invention is an information providing system in which a playback device and an information providing device are connected via a network, and the playback device has a first AV recorded in a first directory structure. A reproduction means for reproducing a stream based on first control information for controlling reproduction of the first AV stream, and a second AV stream recorded in a second directory structure different from the first directory structure Acquisition means for acquiring second control information for controlling reproduction of the first AV stream and the second AV stream from the information providing apparatus; and the second AV stream acquired by the acquisition means Recording means for recording the second control information in the second directory structure, the first AV stream, the second AV stream, Generating means for merging the second control information and generating a virtual file system having the first directory structure, wherein the playback means of the playback device is configured to generate the virtual file generated by the generation means. Based on the system and the second control information, the first AV stream and the second AV stream are reproduced. In addition, the information providing apparatus includes a transmission unit that acquires the second AV stream and the second control information from a database and transmits the second AV stream and the second control information to the reproduction apparatus via the network.

  The information processing apparatus according to the present invention uses the first AV stream recorded in the first directory structure recorded in the removable recording medium as the first control information recorded in the first directory structure. Reproducing means for reproducing based on, obtaining means for obtaining the second AV stream, second control information for controlling reproduction of the first AV stream and the second AV stream, and obtaining by the obtaining means Recording means for recording the second AV stream and the second control information in a second directory structure, the first AV stream recorded in the first directory structure, and the second The second AV stream recorded in the directory structure and the second control information are merged to obtain a virtual file system in the first directory structure. Generating means configured to acquire the second control information based on the virtual file system of the first directory structure generated by the generating means, and the acquired second control Based on the information and the virtual file system, the first AV stream and the second AV stream are reproduced.

  According to the information processing method of the present invention, the first AV stream recorded in the first directory structure recorded on the removable recording medium is converted into the first control information recorded in the first directory structure. The second AV stream, the second AV stream, the second AV stream, and the second control information for controlling the reproduction of the second AV stream, and the acquired second AV stream. And the second control information are recorded in a second directory structure, and the first directory is merged with the first AV stream, the second AV stream, and the second control information. A virtual file system having a structure is generated, and the reproduction means acquires the second control information based on the generated virtual file system, and the acquired second control information and the virtual file are acquired. Based on filesystem, comprising the step of reproducing said first AV stream and the second AV stream.

  A second information providing system of the present invention is an information providing system in which an information processing device and an information providing device are connected via a network, and the information processing device is recorded on a removable recording medium. Reproduction means for reproducing a first AV stream recorded in one directory structure based on first control information recorded in the first directory structure, a second AV stream, and the first AV stream Obtaining means for obtaining a stream and second control information for controlling reproduction of the second AV stream; and obtaining the second AV stream and the second control information obtained by the obtaining means in a second Recording means for recording in a directory structure, the first AV stream, the second AV stream, and the second control information are merged to obtain the first directory. Generating means for generating a virtual file system having a structure, wherein the reproduction means of the information processing apparatus acquires the second control information based on the virtual file system generated by the generating means, and acquires the acquired Based on the second control information and the virtual file system, the first AV stream and the second AV stream are reproduced. In addition, the information providing apparatus includes a transmission unit that acquires the second AV stream and the second control information from a database and transmits the second AV stream and the second control information to the reproduction apparatus via the network.

  The data of the present invention includes a playback means for playing back the first AV stream recorded in the first directory structure based on the first control data for controlling the playback of the first AV stream; An AV stream, a second AV stream recorded in a second directory structure different from the first directory structure, and a second for controlling playback of the first AV stream and the second AV stream Generating means for merging the control data of the first directory structure to generate a virtual file system having the first directory structure, wherein the reproducing means and the virtual file system generated by the generating means and the second control Based on the information, the second control data used in an information processing apparatus for reproducing the first AV stream and the second AV stream. A play item that specifies the first AV stream using a file name on the virtual file system generated by the information processing apparatus, and the second AV stream is the information processing apparatus. And a sub play item that is specified by using a file name on the virtual file system generated in (1).

  In the playback apparatus and playback method of the present invention, the first AV stream recorded in the first directory structure is played based on the first control information for controlling the playback of the first AV stream, and the first One AV stream, a second AV stream recorded in a second directory structure different from the first directory structure, and playback of the first AV stream and the second AV stream are controlled. The virtual file system having the first directory structure is generated by merging with the second control information. Further, based on the generated virtual file system and the second control information, the first AV stream and the second AV stream are reproduced.

  In the first information providing system of the present invention, in the playback device, the first AV stream recorded in the first directory structure is based on the first control information for controlling the playback of the first AV stream. The second AV stream reproduced by the reproducing means and recorded in the second directory structure different from the first directory structure, and the first AV stream for controlling the reproduction of the first AV stream and the second AV stream are controlled. 2 control information is acquired from the information providing apparatus. In addition, the acquired second AV stream and the second control information are recorded in the second directory structure, and the first AV stream, the second AV stream, and the second control information are recorded. The virtual file system having the first directory structure is generated by merging the information. In the playback apparatus, the playback unit plays back the first AV stream and the second AV stream based on the generated virtual file system and the second control information. In the information providing apparatus, the second AV stream and the second control information are acquired from a database and transmitted to the playback apparatus via the network.

  In the information processing apparatus and information processing method of the present invention, the first AV stream recorded in the first directory structure and recorded in the detachable recording medium is recorded in the first directory structure. The second AV stream and the second control information for controlling the reproduction of the first AV stream and the second AV stream are acquired based on the control information of one. Further, the acquired second AV stream and the second control information are recorded in a second directory structure, and the first AV stream recorded in the first directory structure, and the second The second AV stream recorded in the directory structure and the second control information are merged to generate a virtual file system having the first directory structure. The second control information is acquired based on the generated virtual file system of the first directory structure, and the first AV stream is acquired based on the acquired second control information and the virtual file system. The second AV stream is reproduced.

  In the second information providing system of the present invention, in the information processing apparatus, a first AV stream recorded in a detachable recording medium and recorded in the first directory structure is the first directory structure. The second AV stream and the second control information for controlling the reproduction of the first AV stream and the second AV stream are acquired based on the first control information recorded in The acquired second AV stream and the second control information are recorded in a second directory structure. Further, the first AV stream, the second AV stream, and the second control information are merged to generate a virtual file system having the first directory structure. The reproduction means acquires the second control information based on the generated virtual file system, and based on the acquired second control information and the virtual file system, the first AV stream and the second AV streams are reproduced. In the information providing apparatus, the second AV stream and the second control information are acquired from a database and transmitted to the playback apparatus via the network.

  According to the present invention, a user can download an update file of content recorded on a recording medium.

  Further, according to the present invention, the user can use the content recorded on the recording medium relatively freely according to his / her preference.

  Furthermore, according to the present invention, the seller of the recording medium can add a function to the recording medium after the sale. Therefore, the recording medium can be sold in a state where only the necessary minimum data is recorded, and the recording medium can be sold at an earlier timing.

  FIG. 1 is a diagram showing an example of an application format on a recording medium mounted on a player 1 (FIG. 2) to which the present invention is applied. The recording medium may be a magnetic disk or a semiconductor memory in addition to the optical disk described later.

  The application format has two layers, PlayList and Clip, for managing AV (Audio Visual) streams. Here, a pair of one AV stream and Clip Information as information accompanying the AV stream is considered as one object, and these are collectively referred to as a Clip. Hereinafter, the AV stream is also referred to as an AV stream file. Clip Information is also referred to as a Clip Information file.

  In general, a file used in a computer or the like is handled as a byte string, but the content of an AV stream file is expanded on the time axis, and an access point of a Clip is mainly designated by a PlayList with a time stamp.

  When the access point in Clip is indicated by PlayList with a time stamp, the Clip Information file is useful for finding address information to start decoding in the AV stream file from the time stamp.

  PlayList is a collection of AV stream playback sections. One playback section in a certain AV stream is called PlayItem, which is represented by a pair of IN point (playback start point) and OUT point (playback end point) of the playback section on the time axis. Accordingly, the PlayList is composed of one or a plurality of PlayItems as shown in FIG.

  In FIG. 1, the first PlayList from the left is composed of two PlayItems, and the two PlayItems refer to the first half and the second half of the AV stream included in the left Clip, respectively. Also, the second PlayList from the left is composed of one PlayItem, whereby the entire AV stream included in the right Clip is referenced. Further, the third PlayList from the left is composed of two PlayItems, and the two PlayItems refer to a part of the AV stream included in the left Clip and a part of the AV stream included in the right Clip, respectively. ing.

  For example, when the left PlayItem included in the first PlayList from the left is specified as the information indicating the playback position by the navigation program (Disk Navigation program in FIG. 1), the left item referred to by the PlayItem Playback of the first half of the AV stream included in Clip is performed.

  The navigation program has a function of controlling the playback order of the PlayList and interactive playback of the PlayList. The navigation program also has a function of displaying a menu screen for the user to instruct execution of various reproductions. This navigation program is described in a programming language such as Java (registered trademark), for example, and is prepared on a recording medium.

  FIG. 2 is a schematic diagram of the player 1 that reproduces the optical disc 11 as a recording medium on which each data is recorded in the application format of FIG. The detailed configuration of the player 1 will be described later with reference to FIGS.

  The player 1 includes a local storage 12 including an HDD (Hard Disk Drive). The player 1 is connected to the Internet 2 by wire or wireless, and can download content downloaded from a certain server via the Internet 2 to the local storage 12. From the server, for example, data for updating the data (each data in FIG. 1) recorded on the optical disc 11 mounted on the player 1 at that time is downloaded as content.

  When the reproduction of the content recorded on the optical disc 11 is instructed in a state where the downloaded content is recorded on the local storage 12, the content recorded on the optical disc 11 and the local storage 12 are recorded. The content is associated and the content is played back.

  Here, a method of associating and reproducing the content recorded on the optical disc 11 and the content recorded on the local storage 12 will be described.

  For example, it is assumed that the optical disk 11 in FIG. 2 is a medium sold as a package, and a movie is recorded. Further, it is assumed that only an English audio file is recorded on the optical disc 11 as an audio file of the movie.

  For example, in FIG. 2, the Clip1 AV stream recorded on the optical disc 11 and referred to by the PlayItem of PlayList1 is a stream for displaying a movie image, and the Clip2 AV stream referenced by the PlayItem of PlayList2 is This is a stream for outputting English audio along with video display.

  In this state, when a user wants to watch a movie recorded on the optical disc 11 with Japanese dubbing audio, since the Japanese audio file is not recorded on the optical disc 11, the user does not need to record the Japanese dubbing audio. I ca n’t watch movies.

  Therefore, the user causes the player 1 to download a dubbed audio file in Japanese of the movie recorded on the optical disc 11 from the server via the Internet 2. In FIG. 2, no content has been recorded in the local storage 12 yet.

  FIG. 3 is a diagram showing the player 1 in a state where a dubbed audio file in Japanese of a movie recorded on the optical disc 11 has been downloaded.

  That is, when the user instructs to download an audio file in Japanese, the player 1 accesses the server and updates the content recorded on the optical disc 11 so that the file prepared in the server Is downloaded.

  In the example of FIG. 3, a Japanese audio file (Audio stream file), an accompanying Clip Information file, a PlayList file for controlling playback of the Audio stream file (Updated PlayList2 file), and those recorded on the optical disc 11 The navigation program file updated in comparison (Update Disk navigation program file) is downloaded and recorded in the local storage 12. The same PlayList 1 as that recorded on the optical disk 11 is also recorded on the local storage 12.

  The updated play list 2 includes a PlayItem representing a main path and a SubPlayItem representing a sub path added thereto. PlayItem of Updated PlayList2 refers to Clip2 recorded on the optical disc 11, and SubPlayItem refers to Clip3 including Audio stream file of dubbed audio in Japanese downloaded from the server together with Updated PlayList2. is there.

  The updated navigation program in FIG. 3 can specify the SubPlayItem of the Updated PlayList2 as a playback section, and, for example, can play an audio stream file of Clip3 that is a Japanese audio file. .

  Thus, by downloading from the server, the player 1 can select either Clip2 which is an English audio file or Clip3 which is a dubbed audio file in Japanese which is not prepared in advance on the optical disc 11. It can be played back as movie sound. That is, the user can watch a movie with either English or Japanese audio by selecting from the displayed menu screen.

  On the other hand, an optical disc seller (seller, producer), for example, may later provide Japanese audio via the Internet 2 and sell a disc on which a movie with only English audio is recorded. it can. In other words, the optical disc seller can sell the disc at an earlier timing as much as the voice-over audio file in Japanese is prepared. It is also possible to add sales areas later.

  FIG. 4 is a block diagram illustrating a configuration example of the player 1. The configurations described with reference to FIGS. 2 and 3 are denoted by the same reference numerals.

  The controller 21 executes the control program prepared in advance, or controls the optical disc drive 22 to read out the navigation program recorded on the optical disc 11, develops it in the memory 23, and executes it. To control the overall operation of. For example, when the optical disk 11 is loaded, the controller 21 displays a predetermined menu screen on an external display device.

  The optical disk drive 22 reads data from the optical disk 11 under the control of the controller 21 and outputs the read data to the memory 23 and the AV decoder 25. Information such as the navigation program and PlayList is output to the memory 23, and the AV stream is output to the AV decoder 25.

  The memory 23 appropriately stores data necessary for the controller 21 to execute various processes. As described above, the local storage 12 records files downloaded from the server 3 via the Internet 2.

  The Internet interface 24 communicates with the server 3 via the Internet 2 in accordance with control from the controller 21, and supplies data downloaded from the server 3 to the local storage 12.

  The AV decoder 25 decodes the AV stream supplied from the optical disc drive 22 and outputs the obtained video signal and audio signal to an external display device. In the display device, based on the signal decoded by the AV decoder 25, for example, content recorded on the optical disc 11 (video display, audio output) is output.

  FIG. 5 is a block diagram illustrating a functional configuration example of the controller 21 of FIG.

  Each configuration of FIG. 5 is realized by executing a control program prepared in advance by the controller 21 or by executing a navigation program recorded on the optical disc 11 by the controller 21.

  The menu screen display unit 31 is a button operated by the user when selecting the language of the content recorded on the optical disc 11, the angle of the video, or a button operated by the user when selecting an update file to be downloaded. A menu screen including the above is displayed on an external display device. Further, the menu screen display unit 31 detects an input from the user and outputs a signal representing the input from the user to the communication control unit 32.

  The communication control unit 32 controls communication performed in the Internet interface 24 of FIG. For example, the communication control unit 32 downloads and acquires the update file designated by the user from the server 3 and outputs the acquired file to the local storage directory management unit 34.

  The optical disc directory management unit 33 manages the directory of the optical disc 11 and reads each data from the optical disc 11. Studio_id and Content_id, which are identification information, are set in the optical disc 11, and the optical disc directory management unit 33 outputs the Studio_id and Content_id read from the optical disc 11 to the communication control unit 32 and the local storage directory management unit 34. Or data such as an AV stream is output to the playback control unit 36. Further, as will be described later, the optical disk directory management unit 33 converts the file system of the optical disk 11 to the file system when the file system merge processing unit 35 merges the file system of the optical disk 11 and the file system of the local storage 12. The data is output to the merge processing unit 35.

  The local storage directory management unit 34 manages a directory of the local storage 12, reads data from the local storage 12, and writes data to the local storage 12. For example, the PlayList and AV stream read by the local storage directory management unit 34 are output to the reproduction control unit 36. Similarly to the optical disk directory management unit 33, the local storage directory management unit 34 outputs the file system of the local storage 12 to the file system merge processing unit 35 when the file system merge processing unit 35 performs file system merging. .

  The file system merge processing unit 35 merges the file system of the optical disk 11 supplied from the optical disk directory management unit 33 and the file system of the local storage 12 supplied from the local storage directory management unit 34 to create one virtual file. Generate the system. The file system merge processing unit 35 outputs the virtual file system generated by merging to the reproduction control unit 36. Hereinafter, one file system generated by being merged by the file system merge processing unit 35 will be referred to as a virtual file system.

  The playback control unit 36 executes the navigation program specified by the virtual file system supplied from the file system merge processing unit 35, and the AV stream recorded on the optical disc 11 or the local storage 12 by the AV decoder 25 of FIG. Decode (play).

  Here, the merge of the file system of the optical disk 11 and the file system recorded in the local storage 12 by downloading from the server 3 performed by the file system merge processing unit 35 will be described. For example, this merging is performed when reproduction of content recorded on the optical disc 11 is instructed.

  FIG. 6 is a diagram illustrating an example of the file system (left side) of the optical disc 11 and the file system (right side) of the local storage 12. As shown in the figure, each file system has a directory structure.

  A folder with the name “BDMV” is prepared under “root” on the optical disc 11, and a file with the name “info.bdmv” and the name “Navigation.class” are provided in the folder. The set file is stored. Hereinafter, these files are appropriately referred to as an info.bdmv file and a Navigation.class file, respectively. Similarly, other files and folders are referred to by adding “file” to “file name” or adding “folder” to “folder name”.

  In the info.bdmv file, Studio_id, which is identification information of the producer of the optical disc 11, and Content_id, which is content identification information, are described.

  That is, the content recorded on the optical disc 11 is identified from the entire content to be distributed by Studio_id and Content_id. In the example of FIG. 6, Studio_id is “xxx”, and Content_id is “yyy”. Studio_id and Content_id are also used to identify the update file to be downloaded.

  The Navigation.class file is a navigation program described in a predetermined program language.

  The BDMV folder also has a folder with the name “PLAYLIST” (PLAYLIST folder), a folder with the name “CLIPINF” (CLIPINF folder), and a folder with the name “STREAM” (STREAM folder) Is stored.

  In FIG. 6, the PLAYLIST folder stores a file set with the name “11111.mpls” and a file set with the name “22222.mpls”. These files are PlayLists that represent playback sections of AV stream files with time stamps.

  The CLIPINF folder stores a file set with the name “01000.clpi” and a file set with the name “02000.clpi”. These files are Clip Information indicating the correspondence between the time stamp and the address information of the AV stream file.

  The STREAM folder stores a file set with the name “01000.m2ts” and a file set with the name “02000.m2ts”. These files are AV streams.

  On the other hand, a folder in which the name “xxx-yyy” is set is stored under “root” of the local storage 12. The folder name “xxx-yyy” indicates that the data stored in the folder corresponds to the content recorded in the optical disc 11 and identified by Studio_id “xxx” and Content_id “yyy”. To express. As will be described later, in the xxx-yyy folder, the optical disc 11 having Studio_id “xxx” and Content_id “yyy” is mounted on the player 1 and an update file (each file stored in the xxx-yyy folder) is downloaded. It is created when

  The xxx-yyy folder stores info.bdmv file and Navigation.class file. The info.bdmv file is the same as the info.bdmv file on the optical disc 11, and the Navigation.class file is a file obtained by updating the Navigation.class file on the optical disc 11. That is, the Navigation.class file in the local storage 12 is a file describing a navigation program that has been upgraded as compared to the one recorded on the optical disc 11.

  The xxx-yyy folder further stores a PLAYLIST folder, a CLIPINF folder, and a STREAM folder.

  In FIG. 6, a file set with the name “11111.mpls” and a file set with the name “22222.mpls” are stored in the PLAYLIST folder of the local storage 12, of which “22222.mpls” The file with the name “” is an updated file of the file with the same name on the optical disc 11. For example, a file in which the name “22222.mpls” is set in the local storage 12 represents the downloaded Update PlayList2 (FIG. 3), and data in which SubPlayItem is added to the PlayList is described in this file.

  In the CLIPINF folder of the local storage 12, in addition to the file set with the name “01000.clpi” and the file set with the name “02000.clpi” recorded on the optical disc 11, “04000.clpi”. A file with the name "clpi" is stored. That is, the file with the name “04000.clpi” is a file newly acquired by downloading, for example, Clip Information of Clip 3 in FIG.

  The STREAM folder of the local storage 12 stores a file with the name “04000.m2ts”. This file is a file newly acquired by downloading, and is, for example, the audio stream of Clip 3 in FIG.

  Similarly, in the example of FIG. 6, under “root” of the local storage 12, there are a folder set with the name “xxx-aaa” and a folder set with the name “yyy-bbb”. Stored. These were created when the optical disc identified by Studio_id “xxx” and Content_id “aaa” and the optical disc identified by Studio_id “yyy” and Content_id “bbb” were mounted on the player 1, respectively. Files corresponding to the contents of are stored.

  When there is such a file system of the optical disk 11 and a file system of the local storage 12, the file system merge processing unit 35 of the controller 21 merges the file system of the optical disk 11 and the file system of the local storage 12 on the memory 23. Generate a virtual file system.

  Specifically, when a file with the same name exists in both the optical disc 11 and the local storage 12, the file system merge processing unit 35 downloads based on the time stamp (creation date) and version described in each file. Merging is performed so that the file acquired by the above is used as a file to be referred to when the content is reproduced. In addition, the file system merge processing unit 35 performs merging so that a file that is not in the optical disc 11 but only in the local storage 12 is a file to be referred to when content is reproduced.

  FIG. 7 is a diagram illustrating an example of a virtual file system obtained from the two file systems of FIG.

  In FIG. 7, among the files recorded on the optical disc 11, the file with the name “Navigation.class” and “22222.mpls” is updated (replaced) by the downloaded file. . Further, a file set with the name “04000.clpi” and a file set with the name “04000.m2ts”, which are not recorded on the optical disc 11, are added.

  That is, if the downloaded file includes an updated navigation program or PlayList, the file with the same name on the optical disc 11 is updated (replaced) by the file. When a clip file (Clip Information file, AV stream file) that is not on the optical disc 11 is downloaded, it is added to the file system.

  The AV stream based on the navigation program is accessed through the virtual file system generated in this way (the optical disk 11 and the local storage 12 are not directly accessed).

  Here, the syntax of PlayList, PlayItem, and SubPlayItem will be described.

  FIG. 8 is a diagram illustrating the syntax of the PlayList.

  length is a 32-bit unsigned integer indicating the number of bytes from immediately after this length field to the end of PlayList (). 12-bit reserved_for_align is prepared after the length.

  PL_CPI_type is a 4-bit field indicating the type of PlayList and the value of Clip CPI_type referenced by PlayItem () and SubPlayItem (). number_of_PlayItems is a 16-bit field indicating the number of PlayItems in the PlayList.

  number_of_SubPlayItems is a 16-bit field indicating the number of SubPlayItems in the PlayList. This value is 0 or 1. The additional audio stream path (audio stream path) is a kind of sub-path.

  FIG. 9 is a diagram illustrating the syntax of PlayItem.

  One PlayItem () includes a length indicating the length of the PlayItem, Clip_information_file_name that specifies the file name of the Clip, Clip_codec_identifier that specifies the codec format of the Clip, reserved_for_future_use, and connection_condition.

  FIG. 10 is a diagram illustrating the syntax of SubPlayItem.

  SubPlayItem () is related to length indicating the length of PlayItem, Clip_information_file_name specifying Clip, Clip_codec_identifier specifying Clip codec method, SubPlayItem_type indicating sub path type, STC discontinuity (system time base discontinuity) Contains ref_to_STC_id, which is information.

  SubPlayItem () includes SubItem_IN_time and SubItem_OUT_time for designating the playback section of the sub Item in the Clip. Furthermore, subItem includes sync_PlayItem_id and sync_start_PTS_of_PlayItem for specifying the playback start time on the time axis of mainItem.

  Details of the syntax of PlayList, PlayItem, and SubPlayItem are disclosed in Japanese Patent Laid-Open No. 2002-158972.

  FIG. 11 is a block diagram illustrating a configuration example of the server 3 of FIG.

  A CPU (Central Processing Unit) 51 executes various processes according to a program stored in a ROM (Read Only Memory) 52 or a program loaded from a storage unit 58 to a RAM (Random Access Memory) 53. The RAM 53 also appropriately stores data necessary for the CPU 51 to execute various processes.

  The CPU 51, ROM 52, and RAM 53 are connected to each other via a bus 54. An input / output interface 55 is also connected to the bus 54.

  The input / output interface 55 includes an input unit 56 including a keyboard and a mouse, a display including an LCD (Liquid Crystal Display), an output unit 57 including a speaker, a storage unit 58 including a hard disk, and the Internet 2. A communication unit 59 that communicates with the player 1 and the like is connected to the communication unit 59. In the storage unit 58, a database 71 for storing update files to be provided to the accessing player 1 is constructed.

  A drive 60 is also connected to the input / output interface 55 as necessary. The drive 60 is loaded with a removable medium 61 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the server 3 having such a configuration, for example, each function unit of FIG. 12 is realized by the CPU 51 executing the control program.

  The communication control unit 81 controls communication with the player 1 performed in the communication unit 59 and outputs, for example, Studio_id and Content_id notified from the player 1 to the update file management unit 82. Further, when an update file to be provided to the player 1 is supplied from the update file management unit 82, the communication control unit 81 transmits it to the player 1 via the Internet 2.

  Based on the Studio_id and Content_id supplied from the communication control unit 81, the update file management unit 82 identifies the optical disc 11 mounted on the player 1, and updates the content update file recorded on the optical disc 11 from the database 71. get. In addition, the update file management unit 82 outputs the update file acquired from the database 71 to the communication control unit 81 to be provided to the player 1.

  Next, operations of the player 1 and the server 3 having the above configuration will be described with reference to flowcharts.

  First, the process of the controller 21 for downloading the update file from the server 3 will be described with reference to the flowchart of FIG.

  This process is executed when the optical disc 11 is mounted on the player 1 and, for example, it is instructed to download a Japanese audio file of a movie recorded on the optical disc 11 from the menu screen.

  In step S <b> 1, the optical disc directory management unit 33 of the controller 21 controls the optical disc drive 22 and reads Studio_id and Content_id recorded on the optical disc 11. As described with reference to FIG. 6, Studio_id and Content_id are described in the info.bdmv file. The optical disc directory management unit 33 outputs the Studio_id and Content_id read from the optical disc 11 to the communication control unit 32 and the local storage directory management unit 34.

  In step S <b> 2, the communication control unit 32 controls the Internet interface 24 and transmits Studio_id and Content_id supplied from the optical disc directory management unit 33 to the server 3 via the Internet 2. In the server 3 that has received the Studio_id and Content_id transmitted here, the content of the optical disc 11 mounted on the player 1 is identified. At this time, for example, a list of files that can be updated is notified from the server 2 to the player 1.

  In step S3, the menu screen display unit 31 displays an update menu screen on the display device, and proceeds to step S4 to determine whether or not the contents of the update have been selected by operating the button on the menu screen. .

  In step S4, the menu screen display unit 31 stands by until it is determined that the content of the update has been selected. When it is determined that the content of the update has been selected, the menu screen display unit 31 proceeds to step S5. Information representing the content of the update selected by the user is output from the menu screen display unit 31 to the communication control unit 32.

  In step S5, the communication control unit 32 transmits information representing the contents of the update to the server 3, and requests download of the update file.

  In step S <b> 6, the communication control unit 32 downloads an AV stream file prepared as an update file by the server 3 and a Clip Information file associated therewith.

  In step S7, the communication control unit 32 downloads the PlayList in which the SubPlayItem representing the playback path of the AV stream file downloaded in step S6 is added to the main PlayItem. For example, an AV stream file that is a Japanese dubbed audio file is referred to by the SubPlayItem of the downloaded PlayList.

  Further, in step S8, the communication control unit 32 downloads the updated navigation program file. Each file downloaded by the communication control unit 32 is output to the local storage directory management unit 34.

  In step S <b> 9, the local storage directory management unit 34 creates a directory identified by these IDs in the local storage 12 based on the Studio_id and Content_id supplied from the optical disc directory management unit 33. Thereby, for example, as shown in FIG. 6, a folder (directory) in which the name “xxx-yyy” is set as a directory corresponding to the optical disc 11 having “Studio_id of“ xxx ”and Content_id of“ yyy ”is local. Created in the storage 12.

  In step S10, the local storage directory manager 34 expands and stores each file downloaded from the server 3 and supplied via the communication controller 32 in the directory created in step S9.

  Next, an update file providing process executed by the server 3 corresponding to the process of the controller 21 of FIG. 13 will be described with reference to the flowchart of FIG.

  In step S21, the communication control unit 81 (FIG. 12) controls the communication unit 59 to receive Studio_id and Content_id transmitted from the player 1 via the Internet 2. As described above, in the player 1, Studio_id and Content_id are read from the optical disc 11 and transmitted to the server 3 (step S2 in FIG. 13). Studio_id and Content_id received by the communication control unit 81 are output to the update file management unit 82.

  In step S <b> 22, the update file management unit 82 identifies the optical disc attached to the player 1 based on the Studio_id and Content_id supplied from the communication control unit 81, and updates files that can be provided by downloading from the database 71. To detect. For example, a list of update files detected here is notified to the player 1 and displayed on the menu screen as a list of downloadable contents.

  In step S23, the communication control unit 81 determines whether or not information representing the contents of the update has been transmitted from the player 1, and waits until it is determined that the information has been transmitted. If the communication control unit 81 determines in step S23 that information representing the content of the update has been transmitted from the player 1, the communication control unit 81 proceeds to step S24. Information representing the content of the update received by the communication control unit 81 is output to the update file management unit 82.

  In step S24, in response to a request from the player 1, the update file management unit 82 acquires an AV stream file to be provided as an update file and a clip information file associated therewith from the database 71, and from the communication control unit 81 to the player 1 To send to.

  In step S25, the update file management unit 82 acquires the PlayList in which the SubPlayItem representing the playback path of the AV stream file transmitted in step S24 is added to the PlayItem from the database 71, and the player 1 from the communication control unit 81 To send to.

  Further, the update file management unit 82 causes the communication control unit 81 to transmit the updated navigation program to the player 1 in step S26. In the player 1, each file transmitted here is stored in the local storage 12.

  Through the above processing, for example, the updated navigation program, the updated PlayList2, and the Audio stream as shown in FIG. 3 are stored in the local storage 12 of the player 1.

  Next, processing of the controller 21 for playing back content will be described with reference to the flowchart of FIG.

  In the state where the update file downloaded as described above is recorded in the local storage 12, when the reproduction of the content recorded on the optical disc 11 is instructed, in step S31, the optical disc directory management unit 33 11 reads Studio_id and Content_id, and outputs the read Studio_id and Content_id to the local storage directory management unit 34.

  In step S <b> 32, the local storage directory management unit 34 searches for the file system of the local storage 12 corresponding to the file system of the optical disc 11 based on the Studio_id and Content_id supplied from the optical disc directory management unit 33. As described above, the file system corresponding to the file system of the optical disc 11 is stored in a directory in which names including Studio_id and Content_id are set (FIG. 6).

  At this time, the file system of the optical disk 11 is output from the optical disk directory management unit 33 to the file system merge processing unit 35, and the file of the local storage 12 corresponding to the file system of the optical disk 11 is output from the local storage directory management unit 34. The system is output.

  In step S33, the file system merge processing unit 35 merges the file system of the optical disc 11 and the file system of the local storage 12 as described with reference to FIG. 6 and FIG. Is generated. The generated virtual file system is output to the playback control unit 36 and used for playback of the AV stream file.

  In step S35, the reproduction control unit 36 specifies and executes a navigation program from the supplied virtual file system. Therefore, as shown in FIG. 7, when the updated navigation program is in the virtual file system, the navigation program (the navigation program recorded in the local storage 12) is executed.

  In step S35, the playback control unit 36 acquires the PlayList and SubPlayItem specified by the navigation program as playback sections, and proceeds to step S36 to attempt to read the stream file referred to by the acquired PlayList and SubPlayItem. Here, the time stamp represented by PlayList or SubPlayItem is converted into an address by Clip information, and the AV stream is accessed.

  In step S37, the playback control unit 36 reads the AV stream file from the local storage 12 if the AV stream file referred to by the PlayList or SubPlayItem exists in the local storage 12, and otherwise reads the AV stream file from the optical disc 11. Is read.

  For example, when the playback control unit 36 reads an AV stream in accordance with the file system of FIG. 7, an AV stream file in which the file name “01000.m2ts” prepared in advance on the optical disc 11 is set, The AV stream file in which the file name “02000.m2ts” is set is read from the optical disc 11. Further, the AV stream file to which the file name “04000.m2ts” added by download is set is read from the local storage 12.

  In step S38, the playback control unit 36 causes the AV decoder 25 to decode the read AV stream file, and outputs video and audio from the display device.

  As described above, when a virtual file system is generated and used during content playback, for example, playback of an AV stream file referenced by SubPlayItem is performed, and the AV stream file is a Japanese audio file Japanese voice will be output.

  The downloaded update file is continuously stored in the local storage 12, and when the same optical disc is mounted again, the stored file is used and the AV stream file is reproduced. For example, when a Japanese audio file has been downloaded as described above, when the user plays the movie on the optical disc 11 again on the player 1, the user can download the English from the beginning without causing the player 1 to download the movie. Voice can be selected from Japanese.

  The download of the update file as described above may be performed for a fee or may be performed for free.

  Further, when the user instructs to download audio files of a plurality of languages from the menu screen, the AV stream files of the respective languages are not provided, but are collected as one AV stream file on the server 3 side. And the collected AV stream file may be provided. In this case, the position of the AV stream in each language is specified by PlayList.

  In the above description, the case where an audio file in a language different from that recorded in the optical disc 11 is provided by download has been described. However, the provided file is not limited to an audio file. That is, video (moving image) and subtitles that are not recorded on the optical disc 11 may be provided later by downloading, or a still image may be provided. Further, only the PlayList that newly designates the playback section or only the navigation program may be provided by downloading without providing the AV stream file.

  Thus, for example, when selling an optical disc, only the movie data from which a violent scene that may adversely affect children and the like is cut is recorded on the optical disc, and the cut scene is downloaded as an update file. It is possible to provide contents in various forms such as providing them.

  The above description is based on the assumption that the data recorded on the optical disc has been tampered with, or an illegal program has been executed in the player 1 and content has not been reproduced in a manner that is not assumed by the producer of the optical disc. However, it is necessary to deal with such misconduct.

  That is, the following two techniques are required to deal with fraud.

  (1) When another content (update file) associated with an optical disc is downloaded via the Internet 2, for example, a technique for specifying a download destination server is required. That is, it is necessary to have a technology capable of downloading contents only from a server approved by the producer of the optical disk.

  By enabling the content to be downloaded only from a legitimate server prepared by the optical disc producer, the content recorded on the optical disc will be reproduced in a manner not approved by the optical disc producer. Can be prevented.

  (2) When reproducing the content recorded on the optical disc in association with the content recorded on the local storage, a technique for limiting the reproduction of the content recorded on the local storage is required. That is, it is necessary to have a technique capable of reproducing only the content approved by the optical disc producer among the content recorded in the local storage.

  By making it possible to play only content that is approved by the producer of the optical disc among the content recorded in the local storage, the content of the optical disc is played in a manner that is not approved by the producer of the optical disc. Can be prevented.

  If the technologies (1) and (2) above are not prepared, for example, an illegal navigation program that ignores age restrictions (for example, R-18 designation) set in the content is prepared on the local disk. The navigation program may cause problems such as content that should originally be age-restricted to be freely played.

  FIG. 16 is a diagram illustrating a concept of an authentication system including the player 1 and a server to which an update file is downloaded.

  First, a technique (the technique (1) described above) that limits a download destination server when an update file associated with an optical disc is downloaded via the Internet 2 will be described.

  In this case, if the server of the download destination is a server approved by the producer of the optical disc 11 mounted on the player 1, the server should know the secret information about the optical disc 11. Authentication is performed.

  That is, first, the player 1 takes out the secret information of the optical disc 11, sends a question about it to the server, and if the server can return a correct answer to the question, the player 1 Confirm that it is.

Here, as a question that the player 1 sends to the server, for example, the following is used.
A secret password is recorded on the optical disc 11, and the player 1 causes the server to answer the password value.
The player 1 causes the server to answer the data value (1 or 0) at a predetermined address on the optical disc 11.

  Next, when the content recorded on the optical disk 11 and the content recorded on the local storage 12 are reproduced in association with each other, a technology for limiting the reproduction of the content recorded on the local storage 12 (the above (2)) Technology).

  In this case, in the case where content that has already been downloaded (for example, a navigation program) is recorded in the local storage 12, if the download destination server is a server approved by the producer of the optical disc, the content is recorded in the local storage 12. Authentication is performed using the fact that the server should know the secret information about the content being processed.

  That is, first, if the player 1 retrieves confidential information about the content recorded in the local storage 12, sends a question about the content to the server, and the server can return the correct answer to the question, The player 1 confirms that the content recorded in the local storage 12 is correct.

For example, the following is used as a question sent from the player 1 to the server.
A digital watermark is embedded in the navigation program file recorded in the local storage 12, and the player 1 makes the server answer the value. When the navigation program file is described in Java (registered trademark), the digital watermark is embedded in the Navigation Class file (FIG. 6).

  Note that a plurality of different questions may be confirmed in order to make authentication by a question more reliable. If there is only one question, there is a possibility of coincidence by chance, so it is possible to reduce this possibility as much as possible by having multiple questions confirmed.

  Here, the processing of the player 1 for authenticating whether or not the server is a valid server when downloading the application from the access destination server will be described with reference to the flowchart of FIG.

  That is, this process is executed by the player 1 before the process described with reference to the flowchart of FIG.

  In step S51, the optical disc directory management unit 33 of the controller 21 controls the optical disc drive 22 and reads Studio_id and Content_id recorded on the optical disc 11. The optical disc directory management unit 33 outputs the Studio_id and Content_id read from the optical disc 11 to the communication control unit 32.

  In step S52, the communication control unit 32 connects to the server specified by Studio_id of Studio_id and Content_id supplied from the optical disc directory management unit 33.

  In step S53, the optical disc directory management unit 33 reads secret information (hereinafter referred to as secret information A in the description of FIG. 17) from the optical disc 11, and proceeds to step S54. The server is inquired about the information (the server is inquired about the secret information A of the optical disk 11).

  In step S55, the optical disc directory management unit 33 determines whether or not there is a reply from the server, and waits until it is determined that there is a reply. Here, the information returned from the server is referred to as secret information B. The secret information B returned from the server is supplied to the optical disc directory management unit 33 via the communication control unit 32.

  If it is determined in step S55 that there has been a reply from the server, the optical disc directory management unit 33 proceeds to step S56 and determines whether the secret information B is correct, that is, the secret information A read in step S53. Then, it is determined whether or not the secret information B returned from the server matches.

  If it is determined in step S56 that the secret information B returned from the server is correct information, the optical disc directory management unit 33 proceeds to step S57, and causes the communication control unit 32 to continue downloading the update file. If it is determined that the secret information B is not correct information, the process proceeds to step S58 to stop the download.

  Thereafter, the process of FIG. 13 is appropriately performed according to the determination result in step S56.

  As described above, by making an inquiry about the secret information recorded on the optical disc 11, it is possible to perform the download only from a legitimate server.

  Next, processing for authenticating whether or not the player 1 is legitimate when the navigation program recorded in the local storage 12 is executed will be described with reference to the flowchart of FIG.

  That is, this process is executed by the player 1 before the process described with reference to the flowchart of FIG.

  In step S <b> 71, the optical disc directory management unit 33 of the controller 21 controls the optical disc drive 22 and reads Studio_id and Content_id recorded on the optical disc 11. The optical disc directory management unit 33 outputs the Studio_id and Content_id read from the optical disc 11 to the communication control unit 32 and the local storage directory management unit 34.

  In step S72, the local storage directory management unit 34 locally stores content (update file file system) corresponding to the content recorded on the optical disc 11 based on the Studio_id and Content_id supplied from the optical disc directory management unit 33. Detect from storage 12.

  In step S73, the local storage directory management unit 34 reads the navigation program in the detected file system.

  In step S74, the communication control unit 32 connects to the server specified by Studio_id supplied from the optical disc directory management unit 33.

  In step S75, the local storage directory management unit 34 reads secret information (hereinafter, referred to as secret information A in the description of FIG. 18) from the navigation program, proceeds to step S76, and passes the navigation program via the communication control unit 32. The server is inquired about information about the server (the server is asked about the secret information A of the navigation program). For example, as the secret information A, a digital watermark added to the navigation program is used.

  In step S77, the optical disc directory management unit 33 determines whether or not there is a reply from the server, and waits until it is determined that there is a reply. Here, the information returned from the server is referred to as secret information B. The secret information B returned from the server is supplied to the local storage directory management unit 34 via the communication control unit 32.

  If it is determined in step S77 that there is a reply from the server, the local storage directory management unit 34 proceeds to step S78 and determines whether or not the secret information B is correct.

  If it is determined in step S78 that the secret information B returned from the server is correct information, the local storage directory management unit 34 proceeds to step S79 and causes the communication control unit 32 to continue executing the navigation program. On the other hand, if it is determined that the secret information B is not correct information, the process proceeds to step S80 and the execution of the navigation program is stopped.

  Thereafter, the process of FIG. 15 is appropriately performed according to the determination result in step S78.

  In this way, it is possible to prevent an unauthorized navigation program from being executed by confirming the legitimacy of the navigation program before the execution.

  As described above, authentication is performed using information recorded on the optical disk 11 or information downloaded to the local storage 12, so that it is generally used to confirm the validity of data. There is no need to construct an authentication system with a CA (Certificate Authority). That is, the cost can be reduced by the amount of constructing the authentication system.

  The series of processes described above can be executed by hardware, but can also be executed by software.

  When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a network or a recording medium into a general-purpose personal computer or the like.

  As shown in FIG. 11, the recording medium is distributed to provide a program to the user separately from the apparatus main body, and includes a magnetic disk (including a flexible disk) on which the program is recorded, an optical disk (CD- Not only is it composed of a removable medium 61 such as ROM (Compact Disk-Read Only Memory) and DVD, magneto-optical disk (including MD (registered trademark) (Mini-Disk)), or semiconductor memory, It is configured by a ROM 52 on which a program is recorded and a hard disk included in the storage unit 58 provided to the user in a state of being incorporated in the apparatus main body in advance.

  In the present specification, the step of describing the program recorded in the recording medium is not limited to the processing performed in time series according to the described order, but is not necessarily performed in time series, either in parallel or individually. The process to be executed is also included.

  Further, in this specification, the system represents the entire apparatus composed of a plurality of apparatuses.

It is a figure which shows the example of the application format on the recording medium with which the player to which this invention is applied is mounted | worn. It is the schematic of a player. It is a figure which shows the player of the state in which file download was performed. It is a block diagram which shows the structural example of a player. FIG. 5 is a block diagram illustrating a functional configuration example of a controller in FIG. 4. It is a figure which shows the example of the file system of an optical disk, and the file system of a local storage. It is a figure which shows the example of the file system obtained by merging two file systems of FIG. It is a figure which shows the syntax of PlayList. It is a figure which shows the syntax of PlayItem. It is a figure which shows the syntax of SubPlayItem. It is a block diagram which shows the structural example of a server. It is a block diagram which shows the function structural example of a server. It is a flowchart explaining the process of the controller which downloads an update file. It is a flowchart explaining the process performed by the server corresponding to the process of FIG. It is a flowchart explaining the process of the controller which reproduces | regenerates a content. It is a figure which shows the concept of an authentication system. It is a flowchart explaining the process of the player which authenticates the correctness of a server. It is a flowchart explaining the other process of the player which authenticates the correctness of a server.

Explanation of symbols

  1 player, 3 server, 11 optical disk, 12 local storage, 21 controller, 32 communication control unit, 33 optical disk directory management unit, 34 local storage directory management unit, 35 file system merge processing unit, 36 playback control unit, 81 communication control unit , 82 Update File Management Department

Claims (12)

  Playback means for playing back the first AV stream recorded in the first directory structure based on the first control information for controlling the playback of the first AV stream;
  Playback of the first AV stream, a second AV stream recorded in a second directory structure different from the first directory structure, the first AV stream, and the second AV stream Generating means for merging the second control information to be controlled to generate a virtual file system of the first directory structure;
  With
  The reproduction means reproduces the first AV stream and the second AV stream based on the virtual file system and the second control information generated by the generation means.
  Playback device.   The first directory structure is a directory structure for a removable recording medium,
  The second directory structure is a directory structure for managing a plurality of the removable recording media.
  The playback apparatus according to claim 1.   The image processing apparatus further comprises acquisition means for acquiring the second AV stream and the second control information from outside.
  The playback apparatus according to claim 1.   Recording means for recording the second AV stream and the second control information acquired by the acquisition means in the second directory structure;
  The acquisition unit acquires a clip information file corresponding to the second AV stream, and causes the recording unit to record the acquired clip information file
  The playback apparatus according to claim 3.   The first control information and the second control information are playlist files,
  The first control information includes at least a play item for managing reproduction of the first AV stream,
  The playlist file corresponding to the second control information includes at least a play item for controlling reproduction of the first AV stream and a sub play item for controlling reproduction of the second AV stream.
  The playback apparatus according to claim 1.   Obtaining means for obtaining the second AV stream and the second control information from outside;
  Recording means for recording the second AV stream and the second control information acquired by the acquisition means in the second directory structure;
  Further comprising
  The generation means further generates a virtual file system by further merging a clip information file corresponding to the first AV stream and a clip information file corresponding to the second AV stream,
  The playlist file corresponding to the second control information corresponds to the clip information file corresponding to the first AV stream on the virtual file system and the second AV stream on the virtual file system. This file contains information that specifies the clip information file to be played
  The playback apparatus according to claim 5.   The reproduction means reproduces the first AV stream recorded in the first directory structure based on the first control information for controlling reproduction of the first AV stream,
  Playback of the first AV stream, a second AV stream recorded in a second directory structure different from the first directory structure, the first AV stream, and the second AV stream Merging with the second control information to be controlled to generate a virtual file system of the first directory structure;
  The reproduction means reproduces the first AV stream and the second AV stream based on the generated virtual file system and the second control information.
  A reproduction method including steps.   In an information providing system in which a playback device and an information providing device are connected via a network,
  The playback device
    Playback means for playing back the first AV stream recorded in the first directory structure based on the first control information for controlling the playback of the first AV stream;
    A second AV stream recorded in a second directory structure different from the first directory structure, and second control information for controlling reproduction of the first AV stream and the second AV stream; Obtaining means for obtaining from the information providing device;
    Recording means for recording the second AV stream and the second control information acquired by the acquisition means in the second directory structure;
    Generating means for merging the first AV stream, the second AV stream, and the second control information to generate a virtual file system having the first directory structure;
  With
    The reproduction means of the reproduction device reproduces the first AV stream and the second AV stream based on the virtual file system and the second control information generated by the generation means,
  The information providing apparatus includes:
    Transmission means for acquiring the second AV stream and the second control information from a database and transmitting the second AV stream and the second control information to the playback device via the network
  With
  Information provision system.   Playback means for playing back the first AV stream recorded in the first directory structure recorded in the removable recording medium based on the first control information recorded in the first directory structure;
  Obtaining means for obtaining a second AV stream and second control information for controlling reproduction of the first AV stream and the second AV stream;
  Recording means for recording the second AV stream and the second control information acquired by the acquisition means in a second directory structure;
  Generating means for merging the first AV stream, the second AV stream, and the second control information to generate a virtual file system having the first directory structure;
  With
  The reproducing means acquires the second control information based on the virtual file system generated by the generating means, and based on the acquired second control information and the virtual file system, the first AV stream And the second AV stream are reproduced.
  Information processing device.   The reproduction means reproduces the first AV stream recorded in the detachable recording medium and recorded in the first directory structure based on the first control information recorded in the first directory structure,
  Obtaining a second AV stream and second control information for controlling reproduction of the first AV stream and the second AV stream;
  Recording the acquired second AV stream and the second control information in a second directory structure;
  Merging the first AV stream, the second AV stream, and the second control information to generate a virtual file system of the first directory structure;
  The playback means acquires the second control information based on the generated virtual file system, and based on the acquired second control information and the virtual file system, the first AV stream and the second Play AV stream
  An information processing method including steps.   In an information providing system in which an information processing device and an information providing device are connected via a network,
  The information processing apparatus includes:
    Playback means for playing back the first AV stream recorded in the first directory structure recorded in the removable recording medium based on the first control information recorded in the first directory structure;
    Obtaining means for obtaining a second AV stream and second control information for controlling reproduction of the first AV stream and the second AV stream;
    Recording means for recording the second AV stream and the second control information acquired by the acquisition means in a second directory structure;
    Generating means for merging the first AV stream, the second AV stream, and the second control information to generate a virtual file system having the first directory structure;
  With
    The reproducing unit of the information processing apparatus acquires the second control information based on the virtual file system generated by the generating unit, and based on the acquired second control information and the virtual file system, Playing back the first AV stream and the second AV stream;
  The information providing apparatus includes:
    Transmission means for acquiring the second AV stream and the second control information from a database and transmitting the second AV stream and the second control information to the playback device via the network
  With
  Information provision system.   Reproducing means for reproducing the first AV stream recorded in the first directory structure based on first control data for controlling reproduction of the first AV stream;
  Playback of the first AV stream, a second AV stream recorded in a second directory structure different from the first directory structure, the first AV stream, and the second AV stream Generating means for merging the second control data to be controlled to generate a virtual file system of the first directory structure;
  With
  The reproduction unit is used in an information processing apparatus that reproduces the first AV stream and the second AV stream based on the virtual file system and the second control information generated by the generation unit. , The second control data,
  A play item that designates the first AV stream using a file name on the virtual file system generated by the information processing apparatus;
  A sub play item for designating the second AV stream using a file name on the virtual file system generated by the information processing apparatus;
  Data with a data structure containing

Images