JP2008165872A - Digital video reproducing device and reproducing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resume function in next generation HD_DVD video reproduction. <P>SOLUTION: When reproduction of advanced content is interrupted (S502 yes), resume processing is started (S503), and book mark object is generated and stored (S504), while resource information stored in file cache is stored (S505). After that, when reproduction start is indicated (S509 yes), the stored resource information is first copied to the file cache (S511), and then jump is performed to a reproduction interruption point and reproduction is re-started using the stored book mark object (S514). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a resume function in digital video playback.

  At present, DVD (Digital Versatile Disc) video playback devices are widely used. The next generation HD_DVD (High Definition DVD) video that handles both the standard content as an extension of the conventional DVD video and the advanced content that is a major modification of the conventional DVD video has started to be marketed and is going to spread.

  Both conventional DVD videos and next-generation HD_DVD videos often play relatively long programs (movies, concert live, etc.), but for long-term program viewing, program playback is done for the convenience of the viewer (user of the playback device). Remains to be interrupted. In that case, the user desires to resume program reproduction from the interrupted point. There is a resume function as a function that fulfills this user's desire.

As a conventional DVD video realizing the resume function, there is a DVD playback device having a last memory function (see Patent Document 1).
JP 2002-133828 A

  Patent Document 1 discloses a DVD playback apparatus capable of registering last memory information stored when playback is stopped by the last memory function as bookmark information at the next playback start. This device has a last memory function and a bookmark function. When the last memory information is stored by the last memory function at the start of playback and at the time of the previous stop of playback, the last memory information is registered as bookmark information. And means for registering the last memory information as bookmark information when the user inputs an instruction to register the last memory information as bookmark information.

  However, Patent Document 1 does not describe any resume procedure peculiar to advanced content, and there is a problem that a resume function when advanced content playback is interrupted cannot be provided to the user.

  An object of the present invention is to provide a resume function in next-generation HD_DVD video playback.

The digital video playback method according to an embodiment of the present invention includes, for example, a primary video object (P-EVOB) having predetermined playback data and a time map (TMAP) for converting the playback time of the primary video object into address information. A primary video set, a secondary video object (S-EVOB) with playback data different from this primary video set, and a time map (TMAP) that converts the playback time of this secondary video object into address information A secondary video set including a secondary video set and a playlist including object mapping information (object mapping information) describing a playback order and timing relationship between playback objects, which are described in a markup language (XML) Playlist When handles the advanced applications that interact with the playlist (Playlist Associated Advanced Application) as advanced content including the playlist application (Playlist Application) (Advanced Content). Here, resource information (such as Playlist Application Resource in FIG. 8) of the playlist application (Playlist Application) as a resource of the object mapping information (FIG. 5) described in the playlist is stored in a file cache (File in FIG. 2). Cache) is temporarily stored. In this case, when the playlist application exists (Yes in S500), the method of reproducing the advanced content (Advanced Content) may include the following steps. That is,
After the playback of the advanced content is started (S501), when the playback is interrupted (Yes in S502), resume processing is started (S503), and at least one track number and title of video, audio, and subtitles are started. The resource information corresponding to the description content (“file: ///dvddisc/ADV_OBJ/PApp.aca'/”) of the playlist application (Playlist Application) is generated and stored as a bookmark object (S504). (It may include an object of image information and the size is a maximum of 64 MB and large) (S505),
When playback start is instructed (YES in S509), the stored resource information is copied to the file cache (S511), and then the stored bookmark object is used to jump to the playback interruption point and resume playback. (S514).

  By implementing the present invention, it is possible to realize resume playback after playback interruption in a playback environment for next-generation digital video (HD_DVD video) in which playback of an advanced application can be performed in parallel with video playback.

  In other words, it is possible to provide an information reproducing apparatus that enables resume reproduction with advanced content conforming to the HD_DVD video standard.

  Hereinafter, digital video playback apparatuses and playback methods according to various embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration example of a C playback device 1000 according to an embodiment of the present invention. This playback apparatus 1000 reads and plays back HD_DVD information stored therein from a disc 1 (or a hard disk drive or a large-capacity memory device not shown) that complies with the HD_DVD standard. During reproduction, the disc 1 is loaded into the disc drive unit 101. The disk drive unit 101 rotationally drives the loaded disk 1 and reads information stored in the disk 1 using an optical pickup (not shown).

  In addition, the playback device 100 includes a network access unit 102, and accesses the network server 2 configured on a network such as the Internet and acquires information from the network server 2 as necessary. Is also possible. Furthermore, the playback device 100 has a media drive unit 103. If necessary, the playback device 100 accesses the removable storage medium 3 attached to the media drive unit 103 and receives information from the storage medium 3. It can also be read. As this storage medium (Persistent Storage) 3, for example, a USB memory, HDD, memory card, or the like can be used.

  Information read by the disk drive unit 101 and information acquired by the network access unit 102 and / or the media drive unit 103 as needed are supplied to the data processor unit 104 and subjected to error correction processing and the like. The data is stored in a buffer (not shown) in the data processor unit 104. Of the information stored in the buffer, management information is recorded in the memory unit 105 and used for reproduction control, data management, and the like. Of the information stored in the buffer, audio video information (AV information) is transferred to the separation unit 106 and separated (demultiplexed) for each video, graphic unit, audio, and sub-picture. The video information is supplied to the video decoder unit 107, the sub-picture information is supplied to the sub-picture decoder unit 108, the graphic unit information is supplied to the graphic decoder unit 109, and the audio information is supplied to the audio decoder unit 110. It is. A sub-picture is an image such as a caption.

  Video information (main video information) decoded by the video decoder unit 107, sub-picture information decoded by the sub-picture decoder unit 108, and graphic information decoded by the graphic decoder unit 109 are included in the video processor unit 111. And is subjected to superimposition processing, and then converted into an analog signal by a D / A (digital / analog) converter 112, and a video display device (for example, a liquid crystal display, a plasma display, a surface-conduction electron sensor) (not shown) as a video signal. (emitter display, CRT display, etc.). On the other hand, the audio information decoded by the audio decoder unit 110 is converted into an analog signal by the D / A converter 113 and output as an audio signal to an audio reproduction device (such as a speaker) not shown.

  A series of playback operations for the disk 1, the network server 2, and the storage medium 3 as described above are comprehensively controlled by the MPU unit 114 as a control unit. The MPU unit 114 receives operation information from the key input unit 115 and controls each unit based on a program (firmware) stored in the ROM unit 116. The memory unit 105 can also be used as a work area when the MPU unit 114 executes a program.

  Further, the apparatus of FIG. 1 includes a clock generator 117 that generates an operation clock CK of each unit, and the MPU unit 114 is configured to control a clock supply operation from the clock generator 117. The operation clock of the MPU unit 114 is obtained from an internal clock generator (not shown) instead of the clock generator 117, and the MPU unit 114 continues to operate even when the clock generator 117 interrupts the clock supply. It can be done.

  FIG. 2 shows an example of a playback system model (Advanced Content Player Model) when the apparatus of FIG. 1 plays back advanced content of the HD_DVD video standard. From the viewpoint of a system model for reproducing HD_DVD video standard advanced content, the internal configuration of the playback apparatus 1000 in FIG. 1 includes a data access manager 100A, a file cache / streaming buffer 100B, and playback as illustrated in FIG. The engine 100C, the AV renderer 100D, and the navigation manager 100E can be rewritten. The operation clock CK of the system model of FIG. 2 is supplied from the clock generator 117, and the clock supply operation is controlled by the MPU unit 114. Information necessary for resume playback after the advanced content playback is interrupted is appropriately stored in the resume playback information memory 105a. The memory 105a may be prepared individually, but a part of the recording area of the memory unit 105 in FIG. 1 can also be used.

  FIG. 3 is a diagram for explaining an example of contents recorded on a disc-shaped information storage medium (HD_DVD video optical disc) according to an embodiment of the present invention. The disk 1 in FIG. 3A has a lead-in area 10, a volume / file structure information area 11, a data area 12, and a lead-out area 13 from the inner periphery as shown in FIG. 3B. The volume space of the disk 1 includes a volume / file structure information area 11 and a data area 12 as shown in FIG. The data area 12 includes an HD_DVD video area 14 and other areas (areas that can be used for information recording other than HD_DVD video) 15 as appropriate. The HD_DVD video area 14 includes a standard content area 20 and an advanced content area 21. The standard content recorded in the standard content area 20 is composed of navigation data and a video object on the disc, which is an extension of the conventional DVD video standard version 1.1.

  In the advanced content area 21, as shown in FIG. 3D, an advanced video title set (Advanced VTS) 50 and an advanced content (Advanced Content) 60 can be recorded. Details of the advanced content 60 will be described later with reference to FIG.

  As shown in FIG. 3E, the advanced video title set 50 includes control data (video title set information VTSI), time map information (VTS_TMAP), and an extended video object set for titles (VTSTT_EVOBS). The advanced video title set 50 is configured to include VTSI and VTS_TMAP backup files as appropriate. Further, as shown in FIG. 3F, the time map information (VTS_TMAP) can include one or more time map (TMAP) files, and the extended video object set for title (VTSTT_EVOBS) has one or more extensions. Video objects (EVOB) can be included.

  FIG. 4 is a diagram for explaining a configuration example of advanced content. The advanced content 60 includes a playlist, a primary video set, a secondary video set, an advanced application, and an advanced subtitle. (In addition, a configuration file may be included).

  The playlist manages playback objects (Presentation Objects) such as a primary video set, a secondary video set, an advanced application, and an advanced subtitle. This playlist file describes initial system configuration information, synchronization information, and navigation information for advanced content. Specifically, title information (Title Information), media attribute information (Media Attribute Information), and configuration information (Configuration Information) are described in the playlist file. Here, the title information can include a list of title elements, and each title element describes an information set of titles for advanced content.

  The advanced application includes an advanced navigation and an advanced element. Advanced navigation consists of Manifest, Markup, Script files, etc. Advanced elements include Image, Effect Audio, Font (Open Type Font), etc. Consists of files.

  The primary video set includes a primary audio video file. The primary audio video includes video title set information (VTSI: attribute information), time map (TMAP) information for converting the playback time of the object into a corresponding address, and a file of the primary video object (P_EVOB). Here, the time map information (TMAPI) is the extended video object unit (EVOBU) entry information (EVOBU_ENT) corresponding to a part of the extended video object (EVOB) (0.4 to 1 second in terms of playback time). 1 or more can be included. Each entry information (EVOBU_ENT) includes the size information (1STREF_SZ) of the first reference picture belonging to the EVOBU, the playback time information (EVOBU_PB_TM) of the EVOBU, and the size information (EVOBU_SZ) of the EVOBU. .

  The secondary video set includes a substitute audio video (Substitute Audio Video) file, a substitute audio (Substitute Audio) file, and a secondary audio video (Primary Audio Video) file. These files include a time map (TMAP) for converting the playback time of the object into a corresponding address, and a secondary video object (S_EVOB) file. The files of the secondary video set can be stored on the disk 1, stored on the storage medium 3, or downloaded from the network 2.

  This time map (TMAP) includes time map general information (TMAP_GI), time map information search pointer (TMAPI_SRP), time map information (TMAPI) corresponding to this search pointer, and EVOB attribute (EVOB_ATR). Yes. The time map general information (TMAP_GI) includes information on the playback start time information (EVOB_V_S_PTM) of the EVOB, system clock reference information (EVOB_FIRST_SCR) of the first data pack of the EVOB, and the like. The time map information search pointer (TMAPI_SRP # 1) includes the start address (TMAPI_SA) of time map information, the number information of entries (EVOBU_ENT_Ns or TU_ENT_Ns), and the like.

  Here, the EVOB time map information (TMAPI) including the video stream can include one or more extended video object unit entry information (EVOBU_ENT # i). On the other hand, the EVOB time map information (TMAPI) excluding the video stream can include one or more time unit entry information (TU_ENT # i).

  The EVOB attribute (EVOB_ATR) includes the type of secondary video set and type information (EVOB_TY) describing the presence of the sub video stream and sub audio stream, EVOB main video attribute (EVOB_VM_ATR), and EVOB sub video attribute (EVOB_VS_ATR). ), EVOB sub video luma value (EVOB_VS_LUMA), EVOB main audio stream count (EVOB_AMST_Ns), EVOB main audio stream attribute table (EVOB_AMST_ATRT), EVOB audio stream downmix coefficient table (EVOB_DM_COEFTS), EVOB sub The number of audio streams (EVOB_ASST_Ns), EVOB sub audio stream attribute table (EVOB_ASST_ATRT), and the like are included. Here, the sub video luma value (EVOB_VS_LUMA) of EVOB indicates the luminance range (range of Luma Key Function) of the sub video of the corresponding EVOB, and this EVOB_VS_LUMA is only when the corresponding EVOB includes the sub video stream ( In other words, it is valid only when EVOB_TY indicates the presence of sub-video.

  When EVOB_TY indicates the presence of the sub video, the EVOB sub video luma value (EVOB_VS_LUMA) may be part of the resume playback information temporarily stored in the memory 105a in the resume processing described later with reference to FIG. . When EVOB_TY does not indicate the presence of the sub video, the sub video is excluded from the resume process in the resume process described later with reference to FIG.

  The advanced subtitle includes an advanced navigation file and an advanced element file. The advanced navigation file includes an advanced subtitle manifest (Manifest) and an advanced subtitle markup (Markup), and the advanced element file includes an image file such as JPEG / PNG and a font file such as OpenType.

  In addition, the advanced content 60 includes a configuration information file (Configuration File). This file is used for identification (identification) of a specific area in the persistent storage 3 and server authentication (server authentication) in the network 2.

  The details of the advanced content 60 are as described above. To put it simply, the advanced content includes advanced playlists, playlists, manifests, markups, script files, etc. It consists of navigation (Navigation data), advanced data (Advanced data) such as primary / secondary video set (Primary / Secondary Video Set), and advanced elements (Advanced Element) such as images, audio, and text. With regard to this advanced content, it is necessary to position at least one playlist file and primary video set on the disk 1, and other data may be placed on the disk 1 or may be taken from the network server 2 or the storage medium 3. The advanced content realizes a higher level of interactivity in addition to the extension of audio and video realized by the standard content.

FIG. 5 is a diagram for explaining an outline of a playlist used in advanced content. The playlist is described in XML and recorded on the disc 1. When there is advanced content on the disc 1, the playback device 100 first executes this playlist. As shown in FIG. 5, the following information is provided in this playlist:
Object mapping information: Information in the title for the presentation object (playback object) mapped on the title timeline (Title Timeline) (Here, the title timeline is a single content group) (A virtual time axis in the title, which is a description unit.)
Playback sequence information: Playback information for each title described by the title timeline If the first application has a primary / secondary video set or the like according to the description of the playlist, refer to these Executed. One application includes a manifest, markup (which includes content / styling / timing information), a script, and advanced data. The first markup file, script file, and other resources that make up the application are referenced in one manifest. With the markup, playback of advanced data such as primary / secondary video sets and advanced elements is started.

Advanced data is a data type of presentation data for advanced content. Advanced data can be classified into four types:
・ Primary video set ・ Secondary video set ・ Advanced element ・ Others

  The primary video set is a set of data for primary video. The data structure of the primary video set includes navigation data (video title set information VTSI, time map TMAP, etc.) and presentation data (primary enhanced video object P-EVOB, etc.). This primary video set is stored on the disc 1. The primary video set can include various presentation data. Possible presentation stream types include main video, main audio, sub video, sub audio, and sub picture. Here, the primary video set can hold one main video stream, one sub video stream, eight main audio streams, and eight sub audio streams. The playback apparatus 100 can play back sub-video and sub-audio simultaneously in addition to primary video and audio. The sub video and sub audio of the secondary video set cannot be played back during playback of the sub video and sub audio.

  The secondary video set is used when video / audio data is added to the primary video set, and is also used when only audio data is added. This secondary video set is recorded on the disk 1 or is taken from the network server 2 or the storage medium 3 as one or a plurality of files. In this file, when data is recorded on the disk 1 and it is necessary to reproduce the primary video set at the same time, the file cache (100B in FIG. 2) and / or another storage medium (or another storage medium) (3 etc. in FIG. 2). On the other hand, if the secondary video set is on a network server 2 such as a website and / or another storage medium (such as 3 in FIG. 2), the entire data is temporarily saved in a file cache (downloading) or It is necessary to continuously store a part of data in a streaming buffer (100B in FIG. 2). The stored data is reproduced at the same time without causing a buffer overflow while downloading data from the network server 2.

  That is, the secondary video set is a set of data for pre-downloaded content on network streaming and file cache (and / or another storage medium). The data structure of the secondary video set is a simplified structure of advanced VTS (see FIGS. 3D to 3F), and includes a time map (TMAP # 1 to #m) and presentation data (S-EVOB # 1). ~ # M). The secondary video set can include sub video, sub audio, complementary audio, and complementary sub titles. Complementary audio can be used as an alternative audio stream to replace the main audio in the primary video set. The complementary subtitle can be used as an alternative subtitle stream in place of the subpicture in the primary video set. The data format of the complementary subtitle is an advanced subtitle.

The advanced element is used in a graphic plane, sound effects, advanced navigation, and the like, and is used in, for example, the presentation engine 100C of FIG. An advanced element is a presentation material used to create various types of files received from a data source. For example, the following data formats can be used in the advanced element:
・ Image / Animation format * JPEG
* PNG
* MNG
* Capture Image Format
・ Effect audio format * WAV
Text / font format * UNICODE format, UTF-8 or UTF-16
* Open font (OpenType).

  The advanced data includes a game score text file generated by a script in the advanced navigation, or a cookie received when the advanced content starts access to a specific network server 2. Some of these data files are processed as advanced elements depending on the type, such as an image file to be captured during primary video playback by an instruction of advanced navigation.

  As described above, the playlist describes object mapping information, playback sequence information, and configuration information. Here, in the object mapping information, the title timeline defines the timing relationship between the default playback sequence and the presentation object for each title. A scheduled presentation object such as an advanced application, a primary video set, or a secondary video set maps (pre-assigns) its operation time (start time to end time) to the title timeline.

  FIG. 6 shows the state of title timeline object mapping. As the title timeline passes, each presentation object starts and ends its presentation. When the presentation object is synchronized with the title timeline, the operation time (title time) of the preassigned title timeline is equal to the presentation time. In the example of FIG. 6, PT1_0 indicates the presentation start time of P-EVOB-TY2 # 1 (presentation object), and PT1_1 indicates the presentation end time of P-EVOB-TY2 # 1.

  There are constraints on object mapping between secondary video sets, substitute audio (alternate or permuted audio), and substitute audio video (alternate or permuted audio video). It is not allowed to map two or more of these three presentation objects to the title timeline simultaneously.

  In the playback sequence, the start position of the chapter is defined by the time value of the title timeline. The start position of the next chapter or the end of the title line of the last chapter is applied to the end position of the chapter.

  FIG. 7 is a diagram illustrating an example of a relationship among a playlist, a primary video set, a secondary video set, an advanced application, and an advanced subtitle in the advanced content. As described above with reference to FIG. 4 and the like, the advanced content 60 includes a playlist, a primary video set, a secondary video set, and an advanced application. And Advanced Subtitle.

  FIG. 8 is a diagram illustrating a description example of a playlist application element and a playlist application resource element. The playlist object mapping information associated with the advanced application is described by the playlist application element in the title set element. An advanced application (Playlist Associated Advanced Application or Playlist Application) associated with a playlist is a special form of the advanced application, and its lifetime is the entire title timeline of all the titles in the playlist. On the other hand, the lifetime of other advanced applications is the entire timeline of the title or a part of the timeline. In the description example of FIG. 8, “src =’ fo; e: ///dvddosc/ADV_OBJ/PApp.aca′/ ”is a relatively heavy file (up to 64 MB).

  FIG. 9 is a diagram for explaining a description example of a title element in XML notation. In this example, “PrimaryAudioVideoClip | SubstituteAudioVideoClip | SubstituteAudioClip | SecondaryAudioVideoClip |” corresponds to the mapping information of the video clip.

  Here, when the playback clip element of the primary audio video corresponding to the primary video set is a primary audio video clip element, the title element can include mapping information of the primary audio video clip element, and the mapping information includes the mapping information The title time start time information (titleTimeBegin in FIG. 10) and end time information (titleTimeEnd in FIG. 10) for the primary audio video clip element can be included.

  Similarly, when the playback clip element of the secondary audio video corresponding to the secondary video set is a secondary audio video clip element, the title element can include mapping information of the secondary audio video clip element, and the mapping information The title time start time information (titleTimeBegin in FIG. 10) and end time information (titleTimeEnd in FIG. 10) for the secondary audio video clip element can be included.

  FIG. 10 is a diagram illustrating a description example of a primary audio video clip element in XML notation. In this example, “titleTimeBegin = timeExpression, clipTimeBegin = timeExpression, titleTimeEnd = timeExpression” corresponds to the mapping information. Also, “Video +, Audio *, Subtitle *, SubVideo ?, SubAudio *” corresponds to the stream information.

  That is, the advanced content (Advanced Content) includes a playlist (FIG. 6) that is a file described in a markup language (XML), and the playlist file includes a list of title elements. When the playback clip element of the primary audio video corresponding to the primary video set is the primary audio video clip element, the title element (FIG. 9) includes mapping information of the primary audio video clip element, and this mapping information is the primary audio video clip. It includes title time start time information (titleTimeBegin in FIG. 10) and end time information (titleTimeEnd in FIG. 10) for the clip element.

  FIG. 11 is a flowchart for explaining an example of the resume process according to the embodiment of the present invention. In a playback device (see FIGS. 1 and 2) that enables advanced content playback of HD_DVD, after playback is stopped by user operation (Play), playback is started by user operation again without disk replacement and power off (Play A function that enables resume playback from the playback position at the time of playback stop will be described below.

  When the disc 1 is loaded in the disc drive unit 101 of FIG. 1, the disc manager included in the data access manager 100A of FIG. 2 has a playlist application (see FIG. 4) on the disc 1 (see FIG. 3). Check whether or not. When there is no playlist application (No in S500), the process returns to other processing. If no in S500, the advanced content playback itself is executed, but the resume function in that case can be realized only by the last memory function as in the case of the standard content playback. When there is a playlist application (Yes in S500), advanced content playback is performed (S501). This reproduction continues until the end of the content is completed or until a stop button or the like is pressed in the middle (No in S502).

In the middle of advanced content playback, for example, when a stop button is pressed by a user operation (No in S502), resume processing is started (S503). Then, Bookmark-Save is performed immediately before execution of the playback stop process, and a bookmark object is generated. This bookmark object is an object used when resuming playback later, and corresponds to a playback object (for example, a part of the Primary Video Set and / or Secondary Video Set in FIG. 7) at the time of playback stop processing. This bookmark object is stored in a part of the storage area of the memory 105a attached to the Main module (such as Advanced Application Manager in the navigation manager 100E in the system model of FIG. 2) (S504). (In FIG. 2, the memory 105a is shown separately from the navigation manager 100E, but there is a data exchange route between the memory 105a and the navigation manager 100E.)
Further, information temporarily stored in the file cache (File Cache 100B in FIG. 2) when the bookmark object is generated (for example, resource information of Playlist Application as exemplified in FIG. 8: image data and linear PCM audio data may be handled. Therefore, the maximum size information of about 64 MB can be stored in the other storage area of the memory 105a belonging to the Main module (S505).

  If the bookmark object and file cache information described above are not stored, the playback resume point will be at the head of the title to be played back during the subsequent resume playback, and the resume function cannot be exhibited.

  When the resume process is thus completed (S506), the playback device of FIG. 1 or FIG. 2 (Advanced Content Player or Advanced Player in the sense of a player that plays back advanced content) performs normal playback end processing (S507), and playback standby. Enter the state.

  Thereafter, when the play button is pressed by a user operation (No in S508) in a state where the disk is not changed and the apparatus is not turned off (No in S508), the process proceeds to the resume operation. That is, first, the advanced player is initialized (S510). Next, playback starts in the resume mode. In that case, the File Cache information held in the memory 105a of the Main module is copied to the file cache (File Cache 100B in FIG. 2) as the original file cache information (S511). As a result, file cache information (Playlist Application Resource, etc. as exemplified in FIG. 8) necessary for resume reproduction is returned to the file cache. Thereafter, execution of the Playlist Application in the advanced content is started (S513), and Bookmark.jump is performed using the bookmark object held in the memory 105a of the Main module. Thereby, the state when the stop button is pressed in S502 is restored, and resume reproduction is started (S514).

  When the above-mentioned resume reproduction is not performed (No in S509), when a disk replacement occurs or power is turned off (Yes in S508), the bookmark object and file cache information (resources) held in the memory 105a of the Main module Information) is discarded (S515). As described above, after the resource information and the bookmark object stored in the memory 105a are discarded, resume playback is not performed even if the Play button is pressed, and the playback start point returns to the head of the title instead of the playback interruption point. If you want to avoid this, use a non-volatile memory for the memory 105a and take measures such as remembering the disk number information for identifying the replaced disk in the non-volatile memory (the resource information in the non-volatile memory is stored). If it is possible to copy back to the file cache and specify that the disk currently loaded in the disk drive is the disk at the time of the resume process, the resume playback process can be performed even after the power is turned off or the disk is replaced.

  The above is summarized as follows. That is, a primary video set (Primary Video Set) including a primary video object (P-EVOB) having predetermined playback data, a time map (TMAP) for converting the playback time of the primary video object into address information, and the primary video A secondary video set (S-EVOB) that has playback data different from the set, a secondary video set including a time map (TMAP) that converts the playback time of this secondary video object into address information, and markup A playlist (Playlist) that is a file described in a language (XML) and includes object mapping information (Object Mapping Information) that describes the playback order and timing relationship between playback objects, and an advanced application that is linked to this playlist Dealing with advanced content (Advanced Content), including the application (Playlist Associated Advanced Application) as a playlist application (Playlist Application).

  Here, the resource information (Playlist Application Resource in FIG. 8) of the playlist application (Playlist Application) is the file cache (File Cache in FIG. 2) as the resource of the object mapping information (FIG. 5) described in the playlist. In the method of reproducing the advanced content (Advanced Content) when the playlist application exists (Yes in S500) (FIG. 11), the playback of the advanced content is performed. Is started (S501), and when the playback is interrupted (Yes in S502), the resume process is started (S503), and the track number and title time of at least one of video, audio, and subtitle are added to the bookmark object. The file corresponding to the description content (“file: ///dvddisc/ADV_OBJ/PApp.aca'/” in FIG. 8) of the playlist application (Playlist Application) The resource information stored in the cache (which may include an object of image information and a size as large as 64 MB at maximum) is stored (S505), and when the start of reproduction is instructed (Yes in S509), the stored resource information is stored. After copying to the file cache (S511), the stored bookmark object is used to jump to the playback interrupt location and resume playback (S514).

  If the disc (1) on which the advanced content is recorded is replaced before the start of playback is instructed (No in S509), or the power of the device that plays the advanced content is turned off (Yes in S508), The stored resource information and the bookmark object can be discarded (S515).

  An apparatus (FIG. 2) that reproduces the advanced content in which the playlist application exists has a file cache that temporarily stores resource information of the playlist application as a resource of the object mapping information described in the playlist ( 100B: File Cache in FIG. 2 and a bookmark memory for generating and storing at least one track number and title time of video, audio, and subtitle as a bookmark object (part of the storage area of 105a in FIG. 2) And the resource information corresponding to the description content (“file: ///dvddisc/ADV_OBJ/PApp.aca'/” in FIG. 8) of the playlist application stored in the file cache. Resource memory (Figure 105a) and a playback engine (see FIG. 2) that copies the resource information stored in the resource memory to the file cache and resumes playback using the bookmark object stored in the bookmark memory. 100C).

  Alternatively, a digital video playback apparatus having an advanced content playback function and a resume playback function defined in the HD_DVD video standard may generate a bookmark object immediately before playback stop execution (see FIG. 1 or FIG. MPU 114) in FIG. 2, a file cache (100B in FIG. 2) for temporarily storing resource information (FIG. 8) of the playlist application included in the advanced content, and resource information of the playlist application in the file cache. A resource information storage unit for storing (a part of 105a in FIG. 2) and a bookmark storage unit for storing the bookmark object generated by the bookmark generation unit (the other part of 105a in FIG. 2) can be configured. Here, resume playback of the advanced content is performed using the resource information stored in the resource information storage unit and the bookmark object stored in the bookmark storage unit (S510 to S514 in FIG. 11).

  According to one embodiment of the present invention, it is possible to provide an information reproducing apparatus capable of resume reproduction with advanced content conforming to the HD_DVD standard.

  The present invention is not limited to the above-described embodiment as it is, and in the present or future implementation stage, based on the technology available at that time, various modifications may be made without departing from the spirit of the invention. Can be

  Furthermore, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements according to different embodiments may be appropriately combined.

1 is a block diagram illustrating a configuration example of a digital video playback apparatus according to an embodiment of the present invention. The figure explaining an example of the reproduction | regeneration system model of advanced content. The figure explaining an example of the content recorded on the disk-shaped information storage medium (HD_DVD video optical disk) concerning one embodiment of this invention. The figure explaining the structural example of advanced content. The figure explaining an example of the outline | summary of a play list. The figure explaining an example of the object mapping on a title timeline. The figure explaining an example of the relationship between a play list, a primary video set, a secondary video set, an advanced application, and an advanced subtitle in advanced content. The figure explaining the example of a description of a playlist application element and a playlist application resource element. The figure explaining the example of description of the title element by XML description. The figure explaining the example of description of the primary audio video clip element by XML description. The flowchart figure explaining an example of the resume process which concerns on one embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Disc-shaped information storage medium (HD_DVD video optical disk), 2 ... Network server, 3 ... Storage medium, 100 ... Playback apparatus (HD_DVD playback apparatus), 101 ... Disk drive part, 102 ... Network access part, 103 ... Media drive 104: Data processor unit, 105 ... Memory unit, 105a ... Memory of resume reproduction information (bookmark object, playlist application resource information, etc.), 106 ... Separation unit (demultiplexer), 107 ... Video decoder unit, 108 ... Sub Picture decoder unit 109 ... Graphic decoder unit 110 ... Audio decoder unit 111 ... Video processor unit 112 ... Video D / A converter 113 ... Audio D / A converter 114 ... MPU unit 115 ... Key input unit , 11 ... ROM section, 117 ... clock generator.

Claims (4)

A primary video set including a primary video object having predetermined playback data and a time map for converting the playback time of the primary video object into address information, a secondary video object having playback data different from the primary video set, and the secondary video object A secondary video set including a time map for converting the playback time of a video object into address information, and a playlist including object mapping information describing a playback order and timing relationship between playback objects, which are files written in a markup language. And an advanced content including a playlist application as an advanced application linked with the playlist, When the playlist application resource information is temporarily stored in a file cache as a resource of the object mapping information described in a list, the advanced content is played back when the playlist application exists. ,
When the playback of the advanced content is started and the playback is interrupted, resume processing is started, and at least one track number and title time of video, audio, and subtitle are generated and stored as a bookmark object. And storing the resource information stored in the file cache corresponding to the description content of the playlist application,
When playback is instructed, the stored resource information is copied to the file cache and then the playlist application is started. Using the stored bookmark object, the playback is resumed by jumping to the playback interruption point. A digital video playback method configured to.   If the disc on which the advanced content is recorded is replaced before the playback start is instructed, or if the device that plays back the advanced content is turned off, the stored resource information and the bookmark object The reproduction method according to claim 1, wherein: A primary video set including a primary video object having predetermined playback data and a time map for converting the playback time of the primary video object into address information, a secondary video object having playback data different from the primary video set, and the secondary video object A secondary video set including a time map for converting the playback time of a video object into address information, and a playlist including object mapping information describing a playback order and timing relationship between playback objects, which are files written in a markup language. And an advanced content including a playlist application as an advanced application linked with the playlist, Device for reproducing the advanced content when the strike application exists,
A file cache for temporarily storing resource information of the playlist application as a resource of the object mapping information described in the playlist;
Bookmark memory for generating and storing at least one track number and title time of video, audio, and subtitle as a bookmark object;
A resource memory for storing the resource information corresponding to the description content of the playlist application stored in the file cache;
A digital video playback apparatus comprising: a playback engine that copies the resource information stored in the resource memory to the file cache and restarts playback using the bookmark object stored in the bookmark memory. It has advanced content playback function and resume playback function defined by HD_DVD video standard,
A bookmark generation unit that generates a bookmark object immediately before execution of playback stop,
A file cache for temporarily storing resource information of the playlist application included in the advanced content;
A resource information storage unit for storing resource information of the playlist application in the file cache;
A bookmark storage unit for storing the bookmark object generated by the bookmark generation unit,
A digital video playback apparatus configured to perform resume playback of the advanced content using resource information stored in the resource information storage unit and a bookmark object stored in the bookmark storage unit.

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