EP1924992A2 - Apparatus for reproducing data, method thereof, apparatus for recording the same, method thereof and recording medium - Google Patents

Apparatus for reproducing data, method thereof, apparatus for recording the same, method thereof and recording medium

Info

Publication number
EP1924992A2
EP1924992A2 EP06769352A EP06769352A EP1924992A2 EP 1924992 A2 EP1924992 A2 EP 1924992A2 EP 06769352 A EP06769352 A EP 06769352A EP 06769352 A EP06769352 A EP 06769352A EP 1924992 A2 EP1924992 A2 EP 1924992A2
Authority
EP
European Patent Office
Prior art keywords
video stream
secondary video
stream
information
reproduce
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06769352A
Other languages
German (de)
French (fr)
Other versions
EP1924992A4 (en
Inventor
Kun Suk Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020060035036A external-priority patent/KR20070014947A/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Publication of EP1924992A2 publication Critical patent/EP1924992A2/en
Publication of EP1924992A4 publication Critical patent/EP1924992A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
    • G11B27/326—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier used signal is a video-frame or a video-field (P.I.P.)
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/11—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information not detectable on the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs

Definitions

  • the present invention relates to a method and an apparatus
  • optical discs capable of recording large-scale data
  • HDTV and MPEG2 have been provided.
  • the present invention relates to a method of managing
  • the method includes determining a
  • the secondary video stream represents the picture-in-picture
  • information includes identifying information identifying the
  • information includes display information indicating whether
  • a state of the display information is set
  • the instruction may be
  • the navigation information includes secondary video
  • the management table further
  • the combination information includes combination information.
  • the combination information includes combination information.
  • the present invention also relates to a reproduction
  • the reproduction apparatus includes a
  • the memory unit is configured
  • controller is configured to control reproduction of the
  • the secondary video stream represents the picture-in-picture
  • the memory unit includes at least one status register.
  • the management information includes a flag
  • the controller may set a state of the flag based on a received instruction.
  • the instruction For example, the instruction
  • the apparatus further includes a decoder
  • controller is configured to control the decoder to decode the
  • the controller is
  • the management table indicates a number of secondary
  • the management information includes size information indicating a size to
  • video stream is displayed at the size indicated by the size information .
  • the size information stored in the memory may be received from a user, an application program interface, or
  • the controller is configured to control a
  • the playlist indicates at least the primary
  • the controller is configured to store the
  • the present invention further relates to a recording medium
  • the recording medium includes a secondary video stream number area and a first flag area.
  • video stream number area stores a number identifying a
  • the secondary video stream represents the picture-in-
  • first flag area stores a first flag indicating whether the
  • the present invention also relates to an apparatus and a
  • FIG. 1 is a diagram of one embodiment of reproducing data
  • FIG. 2 is a diagram of a file structure recorded in an
  • FIG. 3 is a diagram of a recording structure of an optical disc
  • FIG. 4 is a diagram for explaining a reproduction of a
  • FIG. 5 is a schematic block diagram of an overall
  • FIG. 6 is a schematic block diagram of a playback system
  • FIG. 7 is a diagram of a data reproducing apparatus utilizing
  • FIG. 8A is an exemplary diagram of a status memory unit
  • FIG. 8B is an exemplary diagram of PSR14 as a part of the
  • FIG. 9 is an exemplary diagram of syntax of a table including
  • FIG. 10 is a flowchart of a method of reproducing data
  • an optical disc such as a
  • DVD Blu-ray disc
  • HD-DVD Blu-ray disc
  • NFR near field recording
  • the present invention more particularly takes a "Blu-ray disc
  • Storage may be a storage means provided within an optical record player such as shown in FIG.
  • the "Storage” may be utilized as a means for storing data
  • the data associated with the recording medium to be stored within the storage may
  • the in the recording medium may be stored within the storage.
  • Contents in the following description may be data provided by a record medium author as contents configuring a title.
  • Tile as used in the following description may be a unit
  • HDMV Title titles recorded within a disc shall be named a "HDMV Title”.
  • Reproduction management data used in the following description means information used in managing a reproduction
  • FIG. 1 shows one embodiment of reproducing data within a
  • the present invention enables recording or playback of an
  • optical disc according to various specifications. And, the
  • optical record player 10 can be designed to record/play an
  • optical disc e.g., BD
  • the optical record player 10 can be made to play an optical
  • BD Blu-ray disc
  • peripheral device a BD-player reproducing a
  • BD Blu-ray disc
  • BD-recorder recording/playing a Blu-
  • ray disc (BD) will be taken as an example. And, it is
  • optical record player 10 includes a “drive” loadable within a computer or the like.
  • the optical record player 10 is equipped with a function of recording/playing an
  • optical disc 30 and a function of receiving an external input
  • DMB digital multimedia
  • an Internet signal or the like can be a broadcast (cast) signal, an Internet signal or the like.
  • an audio stream e.g., English
  • a request for downloading the audio stream (e.g.,
  • association may be made by a user. To enable the requests, association
  • FIG. 2 is a diagram of a file structure recorded within an optical disc as a recording medium according to an embodiment
  • FIG. 2 shows a file
  • At least one BDMV directory exists below
  • index an index file
  • the BDMV directory includes a
  • Playlist directory (“PLAYLIST”) , a clipinfo directory (“CLIPINF”) , a stream directory (“STREAM”) , an
  • AUXDATA auxiliary directory
  • BDJO BDJO
  • MEA metadata directory
  • BACKUP BACKUP directory
  • the JAR directory includes JAVA program files.
  • the metadata directory (“META") includes a metadata file as
  • the BD-J object directory (“BDJO”) includes a BD-J Object file
  • auxiliary directory (“AUXDATA”) includes auxiliary files
  • AUXDATA directory may include a sound file ("Sound. bdmv")
  • an AV stream and at least one or more AV stream files
  • the clipinfo directory (“CLIPINF”) includes clip information
  • a clip information file (“*.clpi") includes attribute information
  • the playlist directory (“PLAYLIST”) includes playlist files
  • a playlist is a group of playing intervals for
  • a playing interval is called a
  • Each of the playlist files (“*.mpls") includes at
  • SubPlayltem (SPI) have information about a reproduction
  • the playlist can be called a set of
  • Playltems metadata for managing a reproduction of a secondary video is included within the playlist file.
  • the metadata includes a reproduction time
  • Playltem is called "main path" and a reproduction process
  • Sub path within PlayList file by each SubPlayltem is called "sub path”.
  • the main path provides a master presentation of a playlist
  • the main path should exist
  • video data reproduced by the main path is also called primary video, and video data reproduced
  • optical record player may be "PiP (Picture in Picture).
  • the backup directory BACKUP stores a copy of the index file
  • index (index) recording information associated with a disc
  • the BACKUP directory stores these files for backup .
  • FIG. 3 is a diagram of a data record structure written on an
  • optical disc as a recording medium according to an embodiment of the present invention, which shows how the aforesaid file
  • audio/video/graphic or a JAR file is recorded.
  • system information area or the database area. In some cases,
  • reproduction information of a stream can be recorded in a
  • header corresponds to the management area as well. So, information associated with playback management can be
  • FIG. 4 is a diagram of a reproduction mode of secondary video
  • another video data associated with a primary video 410 can be requested to be output to a same
  • the secondary video 420 may
  • a playback of the secondary video 420 may
  • the primary video 410 can be played
  • video 420 can be played together with an associated audio
  • video is provided to play back the secondary video. And, information for defining an audio stream, presentation
  • graphic or text subtitle stream e.g., PiP PG textST stream
  • a player is provided with a memory unit (e.g., PSRs) storing a
  • FIG. 5 is a block diagram of an overall configuration of an
  • an optical record player 10 according to
  • one embodiment of the present invention includes a pickup 11
  • the signal processor 13 also restoring a reproduction signal received from the pickup 11 to a specific signal value.
  • the signal processor 13 also restoring a reproduction signal received from the pickup 11 to a specific signal value.
  • a microprocessor 16 controls the overall optical disc
  • microprocessor 16 are also collectively referred to as a
  • the recording/reproducing unit reads data from an
  • optical disc 30 or storage 15 under the control of a
  • controller 12 and sends the read data to an AV decoder 17b.
  • the recording/reproducing unit also receives an encoded signal from an AV encoder 18, and records the received signal
  • the controller 12 downloads additional data present outside
  • the optical recording/reproducing apparatus 10 furthermore controls the optical recording/reproducing apparatus 10
  • the playback system 17 includes an AV
  • the decoder 17b for decoding an AV signal.
  • the AV decoder 17b may include a plurality of decoders.
  • controller 12 for determining a playback direction
  • the ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
  • player model 17a may be implemented as including the AV decoder 17a.
  • the playback system 17 is the
  • FIG. 6 is a schematic block diagram of a playback system
  • a decoder 17b according to one
  • decoder 610a decoding a primary video and a secondary video
  • decoder 610b decoding a secondary video.
  • the decoded primary and secondary videos are output via
  • the controller 12 checks reproduction management data of the
  • secondary video stream data may be recorded in a recording medium 30 or may be downloaded to a storage 15 from an
  • optical record player 10 according to the present
  • invention includes an AV encoder 18. To perform a function of
  • an MPEG2 transport stream e.g., an MPEG2 transport stream according to a control of the
  • controller 12 and then provides the converted signal to the
  • the AV encoder Like the AV decoder 17b, the AV encoder
  • the controller 12 is
  • FIG. 7 shows a data reproducing apparatus utilizing a
  • a "playback system” includes collection
  • reproduction processing means configured as programs
  • the playback system plays a
  • storage e.g., data downloaded from outside.
  • a playback system 17 includes "User Event
  • control engine (176) ", "Presentation engine (177)” and "Virtual
  • HDMV Module (174) for HDMV Titles and the "BD-J Module
  • control function for receiving a command or program within
  • Module (175) enable a portability of a command or
  • the "Java VM (175)” is "Virtual Machine” (VM) executing an
  • the "Application manager (175b)" includes an
  • Module Manager (172) is provided to deliver a
  • the "Playback Control Engine (176)" includes
  • PSRs status registers
  • GPRs general purpose registers
  • Playback Control functions (176a) may mean
  • registers (176b)" becomes a memory unit indicating a playback status of the secondary video.
  • the memory unit will be
  • the HDMV title and BD-J title receive user commands in
  • a received command is a user command by "User Operation (UO) ", the "User Event Manager (171)” transfers it to the "Module
  • invention may include the "Metadata Manager (173)" that
  • FIG. 8A is an exemplary diagram of a status memory unit provided in a reproducing apparatus according to an
  • FIG. 8B is an
  • PSR player status register
  • the optical record player 10 includes "Player Registers
  • GPRs General purpose Registers
  • the "Player Status Registers (PSRs)" can be divided into
  • PSRs Physical Features Registers
  • video is needed to play back the secondary video as well as a primary video.
  • the present invention relates to PSR14 storing
  • a secondary video e.g., a number or
  • PSR14 810 as one of "Player Status
  • PSRs Physical Transport Registers
  • PSR14 can store a secondary video stream number.
  • the PSR 14 includes a "Secondary video
  • a secondary video stream number is stored in the "Secondary
  • stream number is used in specifying which secondary video
  • the secondary video stream number is a value for a secondary
  • the secondary video stream number may be set in one embodiment from 1 to 32. If a value stored in the "secondary
  • a secondary audio stream number is stored in the "Secondary audio stream number" field.
  • stream number is used in specifying the secondary audio
  • the secondary audio stream number is a value for a secondary
  • the secondary audio stream number may be set, in one
  • audio stream number" field is ⁇ 0xFF' , it means that a
  • a secondary video size may be stored in the "Secondary Video
  • a playback size of the secondary video is adjusted according to secondary video size information
  • the secondary video size information may be included in the
  • management data on the recording medium may be more particularly included in metadata for managing a playback of
  • the "disp_v_flag" stored in the PSR14 810 is a flag indicating whether to 'enable' or 'disable' a screen display
  • a user is unable to view the secondary video. For example,
  • the secondary video decoder 610a may
  • a value of the flag "disp_v_flag" can be changed by a command
  • the N ⁇ disp_a_flag" stored in the PSR14 810 is a flag
  • the secondary audio is not played back although the secondary audio may continue to be decoded by the decoder
  • the secondary audio is decoded by the decoder 610b, and a user is able to listen to the secondary audio.
  • a value of the flag "disp_a_flag" can be changed by a command
  • the controller 12 checks the
  • controller 12 may control the secondary video
  • FIG. 9 is an exemplary diagram of the syntax of a table
  • the table (hereinafter called the STN table) defines a list of basic streams that can be selected by an optical record
  • the optical record player 10 possesses a function of processing a secondary
  • the STN table stores entries
  • the secondary audio stream identifiers are generated by adding 1 to the previous secondary audio stream identifier as
  • the secondary video stream identifiers are generated by
  • a "stream entry ()" field in the STN table indicates information for a stream entry. For instance, it indicates
  • the stream entry identifies the stream entry
  • the "stream entry ()" field includes a subclip entry id
  • subpath entry id identifier
  • a "stream attribute ()" field in the STN table indicates information for a stream attribute. For instance, this field
  • An optical record player 10 according to an embodiment of the present disclosure
  • present invention is able to reproduce a suitable video
  • stream entry () For instance, a stream entry field ("stream entry ()")
  • the STN table includes
  • This field includes combination information for
  • the secondary audio is selected based on this
  • FIG. 10 is a flowchart of a method of reproducing data
  • an optical record player 10 according to the present invention
  • reproduction management data for managing reproductions of
  • the optical record player 10 reads a STN-table within the recording medium and then checks information associated with
  • the information associated with the secondary video stream includes a number
  • the optical record player 10 stores the
  • secondary video stream number can indicate one of the secondary video stream entries of the STN table included in a
  • the memory unit may include one or more of the
  • PSRs player status registers
  • the optical record player 10 selects a
  • the selected secondary video stream shall be a stream
  • video stream shall be recorded in the memory unit (e.g., PSR
  • a priority of a playback sequence can be designated
  • API programming interface
  • the playback status information For instance, in reproducing the secondary video stream, if information for the secondary
  • the present invention provides the advantage such as a secondary video can be played together with a
  • a content provider may provide various

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Management Or Editing Of Information On Record Carriers (AREA)

Abstract

In one embodiment, the method includes determining a secondary video stream to reproduce with a primary video stream based on management information stored in a memory. The secondary video stream represents the picture-in-picture presentation path with respect to a primary presentation path represented by a primary video stream. The management information includes identifying information identifying the secondary video stream to reproduce, and the management information includes display information indicating whether to display the secondary video stream. The determined secondary video stream is selectively reproduced based on the management information.

Description

[DESCRIPTION]
APPARATUS FOR REPRODUCING DATA, METHOD THEREOF, APPARATUS FOR
RECORDING THE SAME, METHOD THEREOF AND RECORDING MEDIUM
Technical Field
The present invention relates to a method and an apparatus
for reproducing data from and/or recording data in a
recording medium or storage and the recording medium.
Background Art
Recently, optical discs capable of recording large-scale data
as record media are widely used. To meet the rising demand
for video data of high image quality and audio data of high
sound quality, HDTV and MPEG2 have been provided. For
instance, if video data amounting to one HDTV movie is stored
in a disc with MPEG2 image quality, a high-density recording
medium having at least 20Gbyte data storage capacity is
demanded.
To meet this demand, Blu-ray disc, HD-DVD (high-definition
digital video versatile disc) and the like have been
developed as next generation recording media. And, many
efforts have been made to develop an optical record player
according to high definition recording medium specifications .
However, despite the increasing possibility in recording and
reproducing at least two kinds of video stream data simultaneously due to the development of high definition
recording media, a suitable reproducing method has not been
proposed so far.
Disclosure of Invention
The present invention relates to a method of managing
reproduction of at least one picture-in-picture presentation
path.
In one embodiment, the method includes determining a
secondary video stream to reproduce with a primary video
stream based on management information stored in a memory. The secondary video stream represents the picture-in-picture
presentation path with respect to a primary presentation path
represented by a primary video stream. The management
information includes identifying information identifying the
secondary video stream to reproduce, and the management
information includes display information indicating whether
to display the secondary video stream. The determined
secondary video stream is selectively reproduced based on the
management information.
In one embodiment, a state of the display information is set
based on an instruction. For example, the instruction may be
received from a use, an application program interface, or etc,
One embodiment further includes decoding the secondary video
stream even if the display information indicates not to display the secondary video stream.
Another embodiment further includes reading a management
table from navigation information recorded on a recording
medium. The navigation information includes secondary video
stream entries, and the identifying information for a
selected one of the secondary video stream entries is stored
in the memory.
In a further embodiment, the management table further
includes combination information. The combination information
indicates the secondary audio streams that are combinable
with the secondary video stream. A secondary audio stream number identifying a selected one of the secondary audio
streams indicated by the combination information is stored as
the identifying information.
Yet another embodiment further includes determining a
secondary audio stream to reproduce with the secondary video
stream based on the management information stored in the
memory. The determined secondary audio stream is reproduced
based on the management information.
The present invention also relates to a reproduction
apparatus .
In one embodiment, the reproduction apparatus includes a
memory unit and a controller. The memory unit is configured
to store management information. The management information
indicates a secondary video stream to reproduce and indicates whether the secondary video stream is to be displayed. The
controller is configured to control reproduction of the
secondary video stream based on the management information.
The secondary video stream represents the picture-in-picture
presentation path with respect to a primary presentation path represented by a primary video stream.
In one embodiment, the memory unit includes at least one status register.
In one embodiment, the management information includes a flag
indicating whether to display the secondary video stream. In
this embodiment, the controller may set a state of the flag based on a received instruction. For example, the instruction
may be received from a user, an application program interface,
or etc. In one embodiment, the apparatus further includes a decoder
configured to decode the secondary video stream, and the
controller is configured to control the decoder to decode the
secondary video stream even if the management data indicates
not to display the secondary video stream.
Yet another embodiment includes a driver configured to drive
a reproducing device to reproduce data. The controller is
configured to control the driver to reproduce a management
table. The management table indicates a number of secondary
video stream entries, and the controller stores a secondary
video stream number identifying a selected one of the number of secondary video stream entries in the memory unit as part
of the management information.
In one embodiment of the apparatus, the management
information indicates a secondary audio stream to reproduce
and indicates whether the secondary audio stream is to be played.
In a further embodiment of the apparatus, the management information includes size information indicating a size to
display the secondary video stream, and the controller is
configured to control reproduction such that the secondary
video stream is displayed at the size indicated by the size information .
For example, the size information stored in the memory may be received from a user, an application program interface, or
etc.
In one embodiment, the controller is configured to control a
driver to reproduce metadata from a playlist recorded in the
recording medium. The playlist indicates at least the primary
video stream to reproduce, and the metadata including the
size information. The controller is configured to store the
size information in the memory unit.
The present invention further relates to a recording medium
having a data structure for managing reproduction of at least
one picture-in-picture presentation path.
In one embodiment, the recording medium includes a secondary video stream number area and a first flag area. The secondary
video stream number area stores a number identifying a
secondary video stream to reproduce from another recording
medium. The secondary video stream represents the picture-in-
picture presentation path with respect to a primary
presentation path represented by a primary video stream. The
first flag area stores a first flag indicating whether the
secondary video stream is to be played.
The present invention also relates to an apparatus and a
method for recording the data structure for managing
reproduction of at least one picture-in-picture presentation path.
Brief Description of Drawings
The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated
in and constitute a part of this application, illustrate
embodiment ( s ) of the invention and together with the
description serve to explain the principles of the invention.
In the drawings:
FIG. 1 is a diagram of one embodiment of reproducing data
within a recording medium and/or storage via an optical
record player;
FIG. 2 is a diagram of a file structure recorded in an
optical disc as a recording medium of the present invention; FIG. 3 is a diagram of a recording structure of an optical
disc as a recording medium of the present invention;
FIG. 4 is a diagram for explaining a reproduction of a
secondary video according to an embodiment of the present
invention;
FIG. 5 is a schematic block diagram of an overall
configuration of an optical record player according to an
embodiment of the present invention;
FIG. 6 is a schematic block diagram of a playback system
according to one embodiment of the present invention;
FIG. 7 is a diagram of a data reproducing apparatus utilizing
a playback system according to an embodiment of the present
invention;
FIG. 8A is an exemplary diagram of a status memory unit
provided to a reproducing apparatus according to an
embodiment of the present invention;
FIG. 8B is an exemplary diagram of PSR14 as a part of the
status memory unit shown in FIG. 8A;
FIG. 9 is an exemplary diagram of syntax of a table including
information for a secondary video stream according to an
embodiment of the present invention; and
FIG. 10 is a flowchart of a method of reproducing data
according to an embodiment of the present invention.
Best Mode for Carrying Out the Invention Reference will now be made in detail to example embodiments
of the present invention, which are illustrated in the
accompanying drawings. Wherever possible, the same reference
numbers will be used throughout the drawings to refer to the
same or like parts.
For the purposes of example only, an optical disc such as a
DVD, Blu-ray disc (BD) , HD-DVD, NFR (near field recording)
disc, etc., will be used as an example recording medium in describing the present invention, but it will be understood
that the present invention is not limited to optical discs as
the recording medium. For further convenience of explanation,
the present invention more particularly takes a "Blu-ray disc
(BD)" as an example of a record medium. Yet, it is apparent
that the technical idea of the present invention is
identically applicable to other record media including HD-DVD
and the like.
In the present invention, "Storage" may be a storage means provided within an optical record player such as shown in FIG.
1, and means an element which can randomly store information
and data. In particular, the storage currently used in
general, includes a "hard disc", "system memory", "flash
memory" or the like, which does not put limitation on the
scope of the present invention.
The "Storage" may be utilized as a means for storing data
associated with a recording medium. The data associated with the recording medium to be stored within the storage may
include data externally downloadable such as from the
internet .
It will also be apparent that data directly read out of a
recording medium, in part, or a generated system data (e.g.,
metadata, etc.) associated with reproduction of data recorded
in the recording medium may be stored within the storage.
"Contents" in the following description may be data provided by a record medium author as contents configuring a title.
And, a party, who provides content, is generically named a
"content provider (CP)".
For convenience of explanation of the present invention, the
data recorded within the recording medium shall be called
"original data" and the data obtained outside the recording
medium and associated with the recording medium shall be
called "additional data". The original and additional data
are classified according to acquisition methods only. So,
data existing outside an optical disc and having any kind of
attribute associated with original data can be called
additional data.
"Title" as used in the following description may be a unit
of reproduction configuring an interface with a user. Each
title is linked to a specific object. And, a stream
associated with the corresponding title recorded within a
disc is reproduced according to a command or program within the object. In particular, for explanation convenience of the
present invention, a title having a moving picture, movie and
interactive information according to MPEG2 compression among
titles recorded within a disc shall be named a "HDMV Title".
And, a title having moving picture, movie and interactive
information executed by a Java program among titles recorded
within a disc shall be named a "BD-J Title".
"PiP (Picture-in-Picture) " used in the following description
means a function of playing a secondary video on an image of
a primary video that is being reproduced.
"Reproduction management data" used in the following description means information used in managing a reproduction
of a video or audio stream. And, a stream number (STN) table
containing video stream entry information and audio stream
entry information and metadata managing a secondary video
playback are included in the "reproduction management data".
The above-explained terminologies are replaceable by any
terms indicating the same functions, respectively.
FIG. 1 shows one embodiment of reproducing data within a
recording medium and/or storage via an optical record player.
Referring to FIG. 1, "Optical record player" 10 according to
the present invention enables recording or playback of an
optical disc according to various specifications. And, the
optical record player 10 can be designed to record/play an
optical disc (e.g., BD) of a specific specification. Moreover, the optical record player 10 can be made to play an optical
disc only. In the following description of the present
invention, by considering interactivity between a Blu-ray
disc (BD) and a peripheral device, a BD-player reproducing a
Blu-ray disc (BD) or a BD-recorder recording/playing a Blu-
ray disc (BD) will be taken as an example. And, it is
apparent that the "optical record player" 10 includes a "drive" loadable within a computer or the like.
The optical record player 10 according to the present invention is equipped with a function of recording/playing an
optical disc 30 and a function of receiving an external input
signal, performing signal-processing on the received signal,
and delivering a corresponding image to a user via another
external display 20. In this case, no limitation is put on
the external input signal. And, a DMB (digital multimedia
broadcast) signal, an Internet signal or the like can be a
representative one of the external input signals. In case of
the Internet, as an easily accessible medium, specific data
from the Internet can be downloaded via the optical record
player 10.
The original data and the additional data will be explained
in detail as follows. For instance, if a multiplexed AV
stream for a specific title is recorded as original data
within an optical disc and if an audio stream (e.g., English)
different from the audio stream (e.g., Korean) of the original data is provided as an additional data from the
Internet, a request for downloading the audio stream (e.g.,
English) as the additional data from the Internet to
reproduce together with the AV stream of the original data,
or a request for downloading the audio stream (e.g., English)
as the additional data from the Internet to reproduce only,
may be made by a user. To enable the requests, association
between the original data and the additional data is
regulated and a systematic method of managing/reproducing the
data according to the user's request is provided.
To realize the user's requests, a file structure between the original data and the additional data is provided. File and
data structures usable for a Blu-ray disc (BD) are explained in detail with reference to FIG. 2 and FIG. 3 as follows.
FIG. 2 is a diagram of a file structure recorded within an optical disc as a recording medium according to an embodiment
of the present invention. In particular, FIG. 2 shows a file
structure for reproduction management of original data
recorded within a disc.
Referring to FIG. 2, at least one BDMV directory exists below
one root directory. An index file ("index") and an object
file ("MovieObject") as general file (higher file)
information to secure interactivity with a user exist within
the BDMV directory. And, the BDMV directory includes a
playlist directory ("PLAYLIST") , a clipinfo directory ("CLIPINF") , a stream directory ("STREAM") , an
auxiliary directory ("AUXDATA") , a BD-J object
directory ("BDJO") , a metadata directory ("META") , a backup
directory ("BACKUP") and a JAR director. The BACKUP directory
has information of data actually recorded within a disc and
information about a method of reproducing the recorded data.
The other directories, and the files included in each of the
directories, are explained in detail as follows.
The JAR directory includes JAVA program files. The metadata directory ("META") includes a metadata file as
data about a data. Namely, in the metadata directory ("META") ,
a search file, a metadata file for Disc Library and the like
exist as the metadata files to use for efficient search or
management of data.
The BD-J object directory ("BDJO") includes a BD-J Object file
for reproducing a BD-J Title.
The auxiliary directory ("AUXDATA") includes auxiliary files
containing information for a disc playback. For instance, the
AUXDATA directory may include a sound file ("Sound. bdmv")
providing click sound in case of an execution of interactive
graphic and font files ("11111. otf" and "99999. otf")
providing font information in case of a disc playback.
In the stream directory ("STREAM") , AV stream files recorded
within a disc in a specific format exist. Each of the streams
is recorded as MPEG-2 transport packets in general, and ".m2ts" is used as an extension of a stream file (01000.m2ts,
02000.m2ts, etc.). In particular, a stream generated from
multiplexing video, audio and graphic information together is
named an AV stream and at least one or more AV stream files
construct a title.
The clipinfo directory ("CLIPINF") includes clip information
files (01000. clpi, 02000. clpi, etc.) one-to-one corresponding
to the stream files, respectively. In particular, a clip information file ("*.clpi") includes attribute information
and timing information of the corresponding stream file. In
particular, the stream file ("*.m2ts") and the clip
information file ("*.clpi") corresponding to the stream file
(*.m2ts) are called collectively a "clip". Namely, a "clip"
is the data containing both of the stream file ("*.m2ts") and
the clip information file ("*.clpi").
The playlist directory ("PLAYLIST") includes playlist files
("* .mpls") . A playlist is a group of playing intervals for
reproducing clips. And, a playing interval is called a
Playltem. Each of the playlist files ("*.mpls") includes at
least one Playltem and SubPlayltem (SPI) designating a
playing interval of reproducing a specific clip. The Playltem
and SubPlayltem (SPI) have information about a reproduction
start time (IN-Time) and reproduction end time (OUT-Time) of
a specific clip. So, the playlist can be called a set of
Playltems . And, metadata for managing a reproduction of a secondary video is included within the playlist file.
Moreover, the metadata includes a reproduction time,
reproduction position and size of the secondary video in
association with the reproduction of the secondary video.
A reproduction process within PlayList file by at least one
Playltem is called "main path" and a reproduction process
within PlayList file by each SubPlayltem is called "sub path".
The main path provides a master presentation of a playlist
and the sub path provides auxiliary presentations associated with the master presentation. The main path should exist
within the PlayList file and at least one sub path may exist
according to a presence of SubPlayltem (SPI) .
In the present invention, video data reproduced by the main path is also called primary video, and video data reproduced
by the sub path is also called secondary video. A function of
reproducing both of the primary and secondary videos by an
optical record player may be "PiP (Picture in Picture).
The backup directory BACKUP stores a copy of the index file
("index") recording information associated with a disc
playback among data of the file structure, object files
(MovieObject, BD-J Object), unit key file, all playlist files
("*.mpls") within the playlist directory PLAYLIST, and all
clip information files ("*.clpi") within the clipinfo
directory CLIPINF. Since the loss of the files may be fatal
to the disc playback, the BACKUP directory stores these files for backup .
It is apparent that the file structure of the present
invention is not limited to the above-explained names and
positions. Namely, the directories and files should be
understood not by their names and positions but by their
meanings .
FIG. 3 is a diagram of a data record structure written on an
optical disc as a recording medium according to an embodiment of the present invention, which shows how the aforesaid file
structure associated information is recorded within a
corresponding disc.
Referring to FIG. 3, in view from an inner circumference of a
disc, there exist a file system information area as system
information for managing an entire file, an area ("database
area") in which PlayList and clip information files are
written to reproduce a recorded AV stream (*.m2ts), and an AV
stream area in which a stream configured with
audio/video/graphic or a JAR file is recorded.
And, an area for recording file information for reproducing
contents within the stream area and the like is called a
"Reproduction management area" and corresponds to the file
system information area or the database area. In some cases,
reproduction information of a stream can be recorded in a
header of a stream within the stream area. In this case, the
header corresponds to the management area as well. So, information associated with playback management can be
recorded in the "reproduction management area".
Yet, each area shown in FIG. 3 is exemplarily proposed. And,
it is apparent that the present invention is not limited to
the arrangement structure of the areas shown in FIG. 3.
FIG. 4 is a diagram of a reproduction mode of secondary video
according to embodiments of the present invention. One embodiment of playing a secondary video on an image of a
primary video that is being played is explained with
reference to FIG. 4 as follows.
Referring to FIG. 4, another video data associated with a primary video 410 can be requested to be output to a same
display unit 20 while the primary video is being played back.
For instance, in the course of playing a movie or documentary, in case that a director' s commentary for a shooting process
is to be provided to a user, a video showing the commentary
can be played back as a secondary video 420 together with the
primary video 410. In doing so, the secondary video 420 may
be played together with the playback of the primary video 410.
In some cases, a playback of the secondary video 420 may
start in the middle of reproducing the primary video 410. And,
it is also possible to display the secondary video 420 at a
different position or size on a screen according to a
playback process. Moreover, it is also possible to start or
end a corresponding playback separately from a playback of the primary video 410. The primary video 410 can be played
together with an associated audio 410a and the secondary
video 420 can be played together with an associated audio
420a.
Information for a play timing point, play position, size of
the secondary video and a stream constructing the secondary
video is provided to play back the secondary video. And, information for defining an audio stream, presentation
graphic or text subtitle stream (e.g., PiP PG textST stream)
reproduced together with the secondary video and information
for defining a permitted reproduction combination of the
streams are provided as well. Moreover, an optical record
player is provided with a memory unit (e.g., PSRs) storing a
playback status of the secondary video and a playback
environment.
FIG. 5 is a block diagram of an overall configuration of an
optical record player according to an embodiment of the
present invention.
Referring to FIG. 5, an optical record player 10 according to
one embodiment of the present invention includes a pickup 11
for reproducing original data and reproduction management
information including playback management file information
recorded in an optical disc, a servo 14 for controlling an
action of the pickup 11, and a signal processor 13 for
restoring a reproduction signal received from the pickup 11 to a specific signal value. The signal processor 13 also
modulates a signal to be recorded into a signal recordable on
the optical disc. A microprocessor 16 controls the overall
operations of these elements.
The pickup 11, the servo 14, the signal processor 13, and the
microprocessor 16 are also collectively referred to as a
"recording/reproducing unit". In accordance with the present invention, the recording/reproducing unit reads data from an
optical disc 30 or storage 15 under the control of a
controller 12, and sends the read data to an AV decoder 17b.
The recording/reproducing unit also receives an encoded signal from an AV encoder 18, and records the received signal
in the optical disc 30. Thus, the recording/reproducing unit
can record video and audio data in the optical disc 30.
The controller 12 downloads additional data present outside
the optical disc 30 in accordance with a user command, and
stores the additional data in the storage 15. The controller
12 also reproduces the additional data stored in the storage
15 and/or the original data in the optical disc 30 at the
request of the user.
The optical recording/reproducing apparatus 10 further
includes a playback system 17 for finally decoding data, and
providing the decoded data to the user under the control of
the controller 12. The playback system 17 includes an AV
decoder 17b for decoding an AV signal. The AV decoder 17b may include a plurality of decoders. The playback system 17
also includes a player model 17a for analyzing an object
command or application associated with playback of a
particular title, for analyzing a user command input via the
controller 12, and for determining a playback direction,
based on the results of the analysis. In an embodiment, the
player model 17a may be implemented as including the AV decoder 17a. In this case, the playback system 17 is the
player model itself. FIG. 6 is a schematic block diagram of a playback system
according to an embodiment of the present invention.
Referring to FIG. 6, a decoder 17b according to one
embodiment of the present invention includes a primary video
decoder 610a decoding a primary video and a secondary video
decoder 610b decoding a secondary video.
The decoded primary and secondary videos are output via
primary and secondary video planes 620a and 620b to be
provided to a user, respectively.
The controller 12 checks reproduction management data of the
secondary video and controls the secondary video decoder 610b
so that the secondary video can be decoded into a specific
position and size at a specific timing point according to the
metadata that manages a playback of the secondary video (this
is described in more detail below) . As stated, primary and/or
secondary video stream data may be recorded in a recording medium 30 or may be downloaded to a storage 15 from an
outside of the recording medium.
And, the optical record player 10 according to the present
invention includes an AV encoder 18. To perform a function of
recording a signal on an optical disc, the AV encoder 18
converts an input signal to a signal of a specific format,
e.g., an MPEG2 transport stream according to a control of the
controller 12 and then provides the converted signal to the
signal processor 13. Like the AV decoder 17b, the AV encoder
18 can include a plurality of encoders. The controller 12 is
able to control the primary and secondary video streams,
primary and secondary audio streams, reproduction management
data and the like, which are converted by the corresponding
encoders to be provided to the signal processing unit 13,
respectively, to be recorded on the optical disc.
FIG. 7 shows a data reproducing apparatus utilizing a
playback system according to an embodiment of the present
invention, in which a secondary video is reproduced together
with a primary video by the data reproducing apparatus .
Referring to FIG. 7, a "playback system" includes collection
of reproduction processing means configured as programs
(software) and/or hardware provided within an optical record
player and/or stored on the recording medium and downloaded
on the optical record player. The playback system plays a
recording medium loaded in the optical record player, and simultaneously reproduces and manages the data that is
associated with the recording medium such as that stored in a
storage (e.g., data downloaded from outside).
In particular, a playback system 17 includes "User Event
Manager (171)", "Module Manager (172) ", a "Metadata Manager
(173)", "HDMV Module (174) ", "BD-J Module (175) ", "Playback
control engine (176) ", "Presentation engine (177)" and "Virtual
File System(40)", which are explained in detail as follows. As separate reproduction processing management means for
reproducing HDMV Title and BD-J Title, respectively, the
"HDMV Module (174)" for HDMV Titles and the "BD-J Module
(175)" for BD-J Titles are independently configured. Each of
the "HDMV Module (174)" and the "BD-J Module (175)" has a
control function for receiving a command or program within
the aforesaid object (Movie Object or BD-J Object), and processing the command or program. The "Metadata Manager
(173)" is able to perform a title selection and to provide a
recording medium and title metadata to a user at any time
under a user's control. The "HDMV Module (174)" and "BD-J
Module (175)" enable a portability of a command or
application by separating the command or application from a
hardware configuration of the playback system. As a means for
receiving to process the command, application or the like, a
"Command processor (174a) is provided within the "HDMV Module
(174), and a "Java VM (175a)" and an "Application manager (175b)" are provided within the "BD-J Module (175).
The "Java VM (175)" is "Virtual Machine" (VM) executing an
application. The "Application manager (175b)" includes an
application management function of managing a lifecycle of an
application.
Moreover, the "Module Manager (172)" is provided to deliver a
user command to the "HDMV Module (174)" or the "BD-J Module
(175)" and to control an operation of the "HDMV Module (174)"
or the "BD-J Module (175)". A "Playback control Engine (176)", which is also provided,
interprets PlayList file information recorded within a disc
according to a reproduction command of the "HDMV Module
(174)" or the "BD-J Module (175)" and performs a corresponding reproduction function. Moreover, a
"Presentation Engine (111)" for decoding a specific stream
reproduced and managed by the "Playback Control Engine (176)",
and for displaying the decoded stream on a screen is provided.
Specifically, the "Playback Control Engine (176)" includes
"Playback Control functions (176a)" actually managing
reproductions and "Player Registers (176b)" storing player
status registers (PSRs) and general purpose registers (GPRs) .
„ In some cases, "Playback Control functions (176a)" may mean
"Playback Control Engine (176)".
In an embodiment of the present invention, the "Player
registers (176b)" becomes a memory unit indicating a playback status of the secondary video. The memory unit will be
explained in detail with reference to FIG. 8 later.
The HDMV title and BD-J title receive user commands in
separate types, respectively, and independently perform the
user commands. A means for receiving and delivering a user
command to either the "HDMV Module (174)" or "BD-J Module
(175)" is provided by the "User Event Manager (171)". So, if
a received command is a user command by "User Operation (UO) ", the "User Event Manager (171)" transfers it to the "Module
Manager (172)" or "UO controller (171a)" to perform the user
command. If a received command is a user command by "Key Event", the "User Event Manager (171)" transfers it to the
"Java VM (175a)" within the "BD-J Module (175)" to perform
the user command. And, the playback system 17 according to the present
invention may include the "Metadata Manager (173)" that
provides disc library and enhanced search metadata
applications to a user.
In the above-explained playback system of the present
invention, the "Module Manager (172)", the "HDMV Module
(174)", the "BD-J Module (175)" and the "Playback Control
Engine (176)" are enabled in software. Software processing
tends to be more advantageous than a hardware configuration
in design. Yet, the "Presentation Engine (177)", the decoders
and the planes are normally designed by hardware. In particular, the elements (e.g., reference numbers 172, 174,
175, 176) performed by software can be configured with a
portion of the controller 12. Hence, the configuration of the
present invention should be understood by its meaning but is
not limited to a hardware configuration or a software
configuration .
FIG. 8A is an exemplary diagram of a status memory unit provided in a reproducing apparatus according to an
embodiment of the present invention and FIG. 8B is an
exemplary diagram of a player status register (PSR) 14 as a
part of the status memory unit shown in FIG. 8A.
The optical record player 10 includes "Player Registers
(176b)" as sort of memory units storing information for
record playback status and environment of the player. The
"Player Registers (176b)" can be divided into "General
purpose Registers (GPRs) " and "Player Status Registers
(PSRs) ".
The "Player Status Registers (PSRs)" can be divided into
"Playback Status Registers" storing playback status
parameters (e.g., interactive graphics stream number' and
Λprimary audio number' ) and "Player Setting Registers"
storing optical record player configuration parameters.
In the embodiment of the present invention, "Player Status
Registers (PSRs)" storing a playback status of a secondary
video is needed to play back the secondary video as well as a primary video.
In particular, the present invention relates to PSR14 storing
status information of a secondary video (e.g., a number or
size of a currently reproduced video stream) or information
on enabling or disabling a playback possibility of the
secondary video.
In one embodiment, PSR14 810 as one of "Player Status
Registers (PSRs)" can store a secondary video stream number. And, the PSR (hereinafter named PSR14) can store a secondary
audio stream number associated with the secondary video.
As shown in FIG. 8B, the PSR 14 includes a "Secondary video
stream number" field, a "Secondary audio stream number" field,
a "Secondary Video Size" field, a "disp_v_flag" and a
"disp_a_flag".
A secondary video stream number is stored in the "Secondary
video stream number" field. In this case, the secondary video
stream number is used in specifying which secondary video
stream to present from secondary video stream entries within
an STN table of a current playitem.
The secondary video stream number is a value for a secondary
video stream entry and is obtained by adding Λl' to a
secondary video stream identifier defined in the STN table.
This is because the secondary video stream identifier is
initialized to Λ0' .
The secondary video stream number may be set in one embodiment from 1 to 32. If a value stored in the "secondary
video stream number" field is λOxFE', it means that a current
status is "Valid' , which means that a secondary video stream
is not selected although a secondary video can be played back.
If a value stored in the "secondary video stream number"
field is λOxFF' , it means that a secondary video stream is
not selected or does not exist.
A secondary audio stream number is stored in the "Secondary audio stream number" field. In this case, the secondary audio
stream number is used in specifying the secondary audio
stream to be presented from secondary audio stream entries
within an STN table of a current playitem.
The secondary audio stream number is a value for a secondary
audio stream entry and is obtained by adding Λl' to a
secondary audio stream identifier defined in the STN table.
This is because the secondary audio stream identifier is
initialized to λ0' .
The secondary audio stream number may be set, in one
embodiment, to 1 to 32. If a value stored in the "secondary
audio stream number" field is Λ0xFF' , it means that a
secondary audio stream is not selected or does not exist.
A secondary video size may be stored in the "Secondary Video
Size" field.
For instance, if a value stored in the "Secondary Video Size"
field is λ0x0', a playback size of the secondary video is adjusted according to secondary video size information
included in management data reproduced from the recording
medium. If a value stored in the "Secondary Video Size" field
is λOxF', a size is adjusted into a full-screen size
regardless of secondary video size information included in
reproduced management data. In this case, the full-screen
size means that the playback size of the secondary video is
adjusted into the same size as that of the primary video.
The secondary video size information may be included in the
management data on the recording medium, and may be more particularly included in metadata for managing a playback of
a secondary video.
The "disp_v_flag" stored in the PSR14 810 is a flag indicating whether to 'enable' or 'disable' a screen display
of the secondary video.
For instance, if the flag "disp_v_flag" is set to ^disable'
(0b), the secondary video is not played back although the
secondary video is being decoded by the decoder 610b. Hence,
a user is unable to view the secondary video. For example,
even if the secondary video stream presentation is disabled
by changing the disp_v_flag during presentation of the
secondary video stream, the secondary video decoder 610a may
continue to decode the secondary video stream, but the
secondary video is not displayed.
On the other hand, if the flag "disp_v_flag" is set to Λenable' (lb) , the secondary video is decoded by the decoder
610b and a user is able to view the secondary video via the
secondary video plane 620b.
A value of the flag "disp_v_flag" can be changed by a command
generated from a user operation (UO) , playback system or
application programming interface (hereinafter abbreviated
API) . Hence, a playback of the secondary video can be
controlled despite the execution of the PiP function.
The Nλdisp_a_flag" stored in the PSR14 810 is a flag
indicating whether to 'enable' or 'disable' a playback of the secondary audio.
For instance, if the flag "disp_a_flag" is set to Misable'
(Ob), the secondary audio is not played back although the secondary audio may continue to be decoded by the decoder
610b. Hence, a user is unable to listen to the secondary audio. On the other hand, if the flag "disp_a_flag" is set to
Λenable' (lb) , the secondary audio is decoded by the decoder 610b, and a user is able to listen to the secondary audio.
A value of the flag "disp_a_flag" can be changed by a command
(specifically, navigation command in playback system)
generated from a user operation (UO) , playback system or
application programming interface (hereinafter abbreviated
API) . Hence, a playback of the secondary audio associated
with the secondary video can be controlled despite the
execution of the PiP function. In the aforesaid PSR14, play status information associated
with a secondary video to be played according to reproduction
management data is stored. The controller 12 checks the
secondary video to be played according to the reproduction
management data and controls playback status information
associated with the checked secondary video stored in the
PSR14. And, the controller 12 may control the secondary video
to be played back by checking the playback status information
stored in the PSR14. It may happen that a secondary video is or is not displayed
regardless of metadata that manages a playback of the
secondary video included in the playback status management
data. For instance, if the playback status information
defines that the secondary video is not displayable, the
secondary video is not displayed regardless of other
information for the secondary video. If the playback status
information defines that a reproduction size of the secondary
video is equal to that of a primary video, the secondary
video is played back at the same size as the primary video
regardless of size information of the secondary video
included in the playback status information.
FIG. 9 is an exemplary diagram of the syntax of a table
including information for a secondary video stream according
to an embodiment of the present invention.
The table (hereinafter called the STN table) defines a list of basic streams that can be selected by an optical record
player 10 during a playback of sub-paths associated with a
current playitem. And, the STN table is provided in each
playitem included in a playlist.
The optical record player 10 according to the present invention possesses a function of processing a secondary
video, a secondary audio and a text subtitle. So, the STN table according to the present invention stores entries
associated with a secondary video, a secondary audio, a
presentation graphic and a text subtitle.
Referring to FIG. 9, a
"number_of_secondary_audio_stream_entries" field 910, a
λλnumber_of_secondary_video_stream_entries" field 920 and
fields for defining entries of respective streams are
included in an STN table.
The vvnumber_of_secondary_audio_stream_entries" field 910
indicates a number of secondary audio stream entries recorded
on the recording medium.
The "number_of_secondary_video_stream_entries" field 920
indicates a number of recorded "secondary video stream
entries" recorded on the recording medium.
In association with the secondary audio streams, initially a
secondary audio stream identifier
( ' secondary_audio_stream_id' ) is initialized to '0' (930).
The secondary audio stream identifiers are generated by adding 1 to the previous secondary audio stream identifier as
long as the ' number_of_secondary_audio_stream_entries ' has
not been reached (930).
Similarly in association with secondary video streams,
initially a secondary video stream identifier
( ' secondary_video_stream_id' ) is initialized to '0' (940).
The secondary video stream identifiers are generated by
adding 1 to the previous secondary video stream identifier as
long as the ' number_of_secondary_video_stream_entries ' has
not been reached (940) .
A "stream entry ()" field in the STN table indicates information for a stream entry. For instance, it indicates
information for length and type of a stream. And, depending on the indicated type, the stream entry identifies the
specific stream of a main clip or a sub clip, and may also identify a subpath for the stream.
In particular, a database for identifying an elementary
stream referred to by a stream number for a stream entry is
stored in a "type" field included in the "stream entry ()"
field.
And, the "stream entry ()" field includes a subclip entry id
defined by a subplayitem of a subpath referred to by an
identifier ("subpath entry id") identifying a subpath entry
associated with a playback of a secondary video.
A "stream attribute ()" field in the STN table indicates information for a stream attribute. For instance, this field
indicates information for a frame rate of a video stream
associated with a video format.
An optical record player 10 according to an embodiment of the
present invention is able to reproduce a suitable video
stream according to information defined by the STN table
using information included in metadata for PiP playback
management . For instance, a stream entry field ("stream entry ()")
associated with a playback of a secondary video can be known
from "Playltem_id" and "secondary__video_stream_id" included
in metadata for PiP playback management. Since information
for identifying an associated subpath and subclip entry is
stored in the stream entry field ("stream entry ()"), streams
suitable for the secondary video playback can be reproduced.
Since the secondary video is played back according to the
subpath, once the "Playltem_id" and "secondary video_stream_id" are determined, a playback time
of the secondary video and a playback sequence of streams
configuring the secondary video are determined.
Furthermore, the STN table includes
"comb_info Secondary_video Secondary audio" field, as shown
in FIG. 9. This field includes combination information for
defining allowed combinations of secondary video and
secondary audio. In case that the secondary video is selected in PSR14, the secondary audio is selected based on this
combination information.
FIG. 10 is a flowchart of a method of reproducing data
according to an embodiment of the present invention.
Referring to FIG. 10, an optical record player 10 according
to the present invention reads and checks information
associated with a secondary video stream included in data recorded in a recording medium (S1002) . Herein, the data
includes a primary video stream, a secondary video stream and
reproduction management data for managing reproductions of
theses streams.
For instance, in case of a recording medium input or power-on,
the optical record player 10 reads a STN-table within the recording medium and then checks information associated with
the secondary video stream. In this case, the information associated with the secondary video stream includes a number
of secondary video stream entries, a secondary video stream
entry id and the like.
Subsequently, the optical record player 10 stores the
playback status information associated with the secondary
video stream in a memory unit (S1004). The playback status
information includes a secondary video stream number,
information for a secondary video playback size, enablement
of a secondary video screen display and the like. The
secondary video stream number can indicate one of the secondary video stream entries of the STN table included in a
playlist and corresponds to the secondary video stream entry
identifier. The memory unit may include one or more of the
player status registers (PSRs) included in the optical record
player 10.
For instance, the optical record player 10 selects a
secondary video stream having a lowest number from among secondary video stream numbers corresponding to the secondary
video stream entry identifiers read in the step S1002 and
then stores the corresponding secondary video stream number
in the PSR14.
Subsequently, (S1006) the optical record player 10 plays the
secondary video stream based on the playback status
information associated with the secondary video stream stored
in the memory unit (e.g., PSR 14).
Herein, the selected secondary video stream shall be a stream
reproducible in the player.
In case that there exists a secondary video stream previously
designated by a user operation (UO) , playback system or
application programming interface (hereinafter abbreviated
API) or the like, a number of the corresponding secondary
video stream shall be recorded in the memory unit (e.g., PSR
14). And, a priority of a playback sequence can be designated
according to a type of a secondary video stream as well.
Furthermore, where multiple secondary video streams are available, it will be understood that selection may be made
by a user operation (UO) , playback system or application
programming interface (hereinafter abbreviated API) or the
like - including commands reproduced from the recording
medium.
Moreover, a secondary video stream is presented according to
information for a secondary video playback size included in
the playback status information. For instance, in reproducing the secondary video stream, if information for the secondary
video playback size included in the playback status
information defines that the secondary video shall be played
at a size defined by a playlist, it is able to play back the
secondary video at a secondary video size stored in the
playlist . Accordingly, the present invention provides the advantage such as a secondary video can be played together with a
primary video, a content provider may provide various
contents, and a user may simultaneously view the provided
various contents.
It will be apparent to those skilled in the art that various
modifications and variations can be made in the present
invention without departing from the spirit or scope of the
inventions. Thus, it is intended that the present invention
covers the modifications and variations of this invention.

Claims

[CLAIMS]
1. A method of managing reproduction of at least one picture-
in-picture presentation path, comprising:
determining a secondary video stream to reproduce with a
primary video stream based on management information stored
in a memory, the secondary video stream representing the picture-in-picture presentation path with respect to a
primary presentation path represented by a primary video
stream, the management information including identifying
information identifying the secondary video stream to
reproduce, and the management information including display
information indicating whether to display the secondary video
stream; and
selectively reproducing the determined secondary video
stream based on the management information.
2. The method of claim 1, wherein a state of the display
information is set based on an instruction.
3. The method of claim 2, wherein the instruction is received
from a user.
4. The method of claim 2, wherein the instruction is received
from an application program interface.
5. The method of claim 1, wherein the selectively reproducing
step comprises:
decoding the secondary video stream even if the display
information indicates not to display the secondary video stream.
6. The method of claim 1, further comprising:
reading a management table from navigation information
recorded on a recording medium, the navigation information
including secondary video stream entries; and
storing the identifying information for a selected one
of the secondary video stream entries in the memory as part of the management information.
7. The method of claim 6, wherein the navigation information
is a playitem, and the playitem provides a playback interval
of the primary video stream.
8. The method of claim 6, wherein
the management table further includes combination information,
the combination information indicating the secondary audio
streams that are combinable with the secondary video stream;
and the method further including,
storing, as the identifying information, a secondary audio stream number identifying a selected one of the secondary
audio streams indicated by the combination information.
9. The method of claim 1, further comprising:
determining a secondary audio stream to reproduce with the
secondary video stream based on the management information
stored in the memory; and reproducing the determined secondary audio stream based
on the management information.
10. The method of claim 9, wherein the management information includes a flag indicating whether to play the secondary
audio stream.
11. The method of claim 10, wherein a state of the flag is
set based on an instruction.
12. The method of claim 10, wherein the reproducing the
determined secondary audio stream step comprises:
decoding the secondary audio stream even if the flag
indicates not to play the secondary audio stream.
13. The method of claim 6, wherein management table is
included in at least one playitem of a playlist recorded in
the recording medium, the playitem indicating a playing interval of the primary video stream, and the playlist
indicating which playitems to reproduce.
14. A reproduction apparatus, comprising:
a memory unit configured to store management information,
the management information indicating a secondary video
stream to reproduce and indicating whether the secondary
video stream is to be displayed; and
a controller configured to control reproduction of the secondary video stream based on the management information,
the secondary video stream representing the picture-in-
picture presentation path with respect to a primary
presentation path represented by a primary video stream.
15. The apparatus of claim 14, wherein the memory unit includes at least one status register.
16. The apparatus of claim 14, wherein the management
information includes a flag indicating whether to display the
secondary video stream.
17. The apparatus of claim 16, wherein the controller sets a
state of the flag based on a received instruction.
18. The apparatus of claim 17, wherein the instruction is received from a user.
19. The apparatus of claim 17, wherein the instruction is
received from an application program interface.
20. The apparatus of claim 14, further comprising:
a decoder configured to decode the secondary video
stream; and wherein
the controller is configured to control the decoder to decode the secondary video stream even if the management data
indicates not to display the secondary video stream.
21. The apparatus of claim 14, further comprising:
a driver configured to drive a reproducing device to
reproduce data; and wherein the controller is configured to control the driver to
reproduce a management table, the management table indicating
a number of secondary video stream entries, and the
controller storing a secondary video stream number
identifying a selected one of the number of secondary video
stream entries in the memory unit as part of the management
information.
22. The apparatus of claim 21, wherein the management table
is included in at least one playitem of a playlist recorded in the recording medium, the playitem indicating a playing
interval of the primary video stream, and the playlist
indicating which playitems to reproduce.
23. The apparatus of claim 14, wherein the management
information indicates a secondary audio stream to reproduce
and indicates whether the secondary audio stream is to be
played.
24. The apparatus of claim 23, wherein the management
information includes a flag indicating whether to play the secondary audio stream.
25. The apparatus of claim 24, wherein the controller sets a
state of the flag based on an instruction.
26. The apparatus of claim 23, further comprising:
a decoder configured to decode the secondary audio
stream; and wherein
the controller is configured to control the decoder to decode
the secondary audio stream even if the management data
indicates not to play the secondary audio stream.
27. The apparatus of claim 14, wherein
the management information includes size information indicating a size to display the secondary video stream; and
the controller is configured to control reproduction
such that the secondary video stream is displayed at the size
indicated by the size information.
28. The apparatus of claim 27, wherein the size information
stored in the memory is received from a user.
29. The apparatus of claim 27, wherein the size information
stored in the memory is received from an application program
interface .
30. The apparatus of claim 27, further comprising: a driver configured to drive a reproducing device to
reproduce data from a recording medium; and wherein
the controller is configured to control the driver to
reproduce metadata from a playlist recorded in the recording
medium, the playlist indicating at least the primary video
stream to reproduce, and the metadata including the size
information; and
the controller is configured to store the size information in
the memory unit.
31. The apparatus of claim 30, wherein
the metadata includes composition information indicating a position to display the secondary video stream; and
the controller is configured to control reproduction of
the secondary video stream such that the secondary video
stream is displayed at the position indicated by the
composition information.
32. A recording medium having a data structure for managing
reproduction of at least one picture-in-picture presentation path, comprising:
a secondary video stream number area storing a number
identifying a secondary video stream to reproduce from
another recording medium, the secondary video stream
representing the picture-in-picture presentation path with
respect to a primary presentation path represented by a
primary video stream; and
a first flag area storing a first flag indicating
whether the secondary video stream is to be played.
33. The recording medium of claim 32, further comprising:
a secondary audio stream number area storing a number
identifying a secondary audio stream to reproduce from the
another recording medium; and
a second flag area storing a second flag indicating
whether the secondary audio stream is to be played.
34. The recording medium of claim 33 , further comprising:
a size area storing size information, the size
information indicating a size to display the secondary video
stream.
35. An apparatus for managing reproduction, comprising:
a memory unit; and
a controller configured to store a secondary video
stream number in the memory unit, the secondary video stream
number identifying a secondary video stream to reproduce from
another recording medium, the secondary video stream representing the picture-in-picture presentation path with
respect to a primary presentation path represented by a primary video stream; and
the controller configured to store a first flag in the
memory unit, the first flag indicating whether the secondary video stream is to be displayed.
36. The apparatus of claim 35, wherein
the controller is configured to store a secondary audio
stream number in the memory unit, the secondary audio stream
number identifying a secondary audio stream to reproduce from
the another recording medium; and
the controller is configured to store a second flag in
the memory unit, the second flag indicating whether the secondary audio stream is to be played.
37. The apparatus of claim 36, wherein the controller is
configured to store size information in the memory unit, the
size information indicating a size to display the secondary
video stream.
38. A method of recording a data structure for managing
reproduction of at least one picture-in-picture presentation path, comprising:
storing, in a memory unit, a number identifying a
secondary video stream to reproduce from a recording medium,
the secondary video stream representing the picture-in- picture presentation path with respect to a primary
presentation represented by a primary video stream path
recorded on the recording medium; and
storing, in the memory unit, a first flag indicating whether
the secondary video stream is to be displayed.
39. The method of claim 38, further comprising:
storing, in the memory unit, a number identifying a
secondary audio stream to reproduce from the another
recording medium; and
storing, in the memory unit, a second flag indicating
whether the secondary audio stream is to be played.
40. The method of claim 39, further comprising:
storing size information in the memory unit, the size
information indicating a size to display the secondary video
stream.
EP06769352A 2005-08-22 2006-08-21 Apparatus for reproducing data, method thereof, apparatus for recording the same, method thereof and recording medium Withdrawn EP1924992A4 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US70980705P 2005-08-22 2005-08-22
US71652305P 2005-09-14 2005-09-14
US73741205P 2005-11-17 2005-11-17
KR1020060035036A KR20070014947A (en) 2005-07-29 2006-04-18 Method and apparatus for presenting data and recording data and recording medium
PCT/KR2006/003273 WO2007024075A2 (en) 2005-08-22 2006-08-21 Apparatus for reproducing data, method thereof, apparatus for recording the same, method thereof and recording medium

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EP1924992A2 true EP1924992A2 (en) 2008-05-28
EP1924992A4 EP1924992A4 (en) 2010-04-07

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EP1924992A4 (en) 2010-04-07
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