KR100669616B1 - DVD file system for recording and playing HHD streams - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DVD file system, and more particularly, to a DVD file system for recording and reproducing an HD stream, which makes it possible to record and reproduce a high definition (HD) stream on a DVD medium.

A DVD file system for recording and playing back an HD stream according to the present invention, comprising: a local file area including a disc information area for providing information for recognizing a DVD medium and a program information area for providing program details; An index file area for providing frame position information of a video stream in a file for trick play, a stream file area for storing actual A / V streams, and a periodic still screen of a program are provided. And a file area including a thumbnail file area for providing visual information on the stream, wherein the file system including the local file area and the file area is used to record or play an HD stream in real time on a DVD medium. It is done.

Description

DVD File System for recording and playback of HD streams

1 is a diagram showing the format of a DVD file system according to an embodiment of the present invention.

2 is a diagram showing a structure of a disc information area according to an embodiment of the present invention.

3 is a diagram showing the structure of a program information area according to an embodiment of the present invention;

4 is a block diagram showing a DVD RW and a PVR multifunction apparatus according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DVD file system, and more particularly, to a DVD file system for recording and reproducing an HD stream, which makes it possible to record and reproduce a high definition (HD) stream on a DVD medium.

In order to record or retrieve data from a computer, you need to prepare in advance to read, write, and find data on a storage medium such as a hard disk drive or an optical disk.

A file system is a set of rules for its preparation. It refers to a system that names files, logically locates files for storage or retrieval, and so on. Operating systems such as DOS, Windows, OS / 2, Macintosh, Unix, etc. must have file systems, e.g. FAT16, FAT32, NTFS on Windows, ext2, raiserFS, ext3 on Linux. Etc.

The file is placed in a directory (a folder after Windows 95) or a subdirectory, which is the correct location in the hierarchy. The file system has a convention for naming files. These rules include file name length restrictions, what characters can be used, and some systems limit file name extension lengths. The file system includes a format for setting paths to files through a directory structure.

On the other hand, the optical disk includes a DVD (Digital Video Disk, Digital Versatile Disc) or Blu-ray Disc (Bluray Disc) that can record a large amount of multimedia data.

The international standard of the file system includes the ISO / IEC 13346 standard (ECMA167 standard) and the UDF (Universal Disc Format) standard that determines its implementation protocol.

The DVD file system conforms to this international standard and is standardized as an individual file system standard corresponding to the physical characteristics of DVD-ROM, DVD-R, and DVD-RAM type discs respectively.

However, since a device that records and plays back data using a conventional DVD medium has a format of storing a broadcast stream method in the form of PS (Program Streaming) or storing an analog output of an HD stream that has been decoded, the image quality is deteriorated. It will be impossible to store and play back a non-HD broadcast stream.

That is, a DVD capable of storing a conventional video stream could only store a standard definition (SD) stream. In this case, about 2 hours of video quality can be stored. The problem is that DVD media can store standard definition (SD) video streams, but not HD (high definition) video streams. As a result, even if the reduction in the playback time is reduced, there is an increasing demand for the HD video stream to be stored on DVD for permanent preservation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a file system capable of recording and reproducing an HD broadcast stream on a DVD medium in real time.

DVD file system for recording and playback of HD streams according to the present invention for achieving the above object,

A disc information area provided with information for recognizing a DVD medium;

A local file area including a program information area provided with program details;

An index file area where frame position information of a video stream is provided within a file for trick play;

A stream file area in which actual A / V streams are stored;

And a file area including a thumbnail file area for providing a periodic still picture of the program and for providing visual information about the stream.

In the present invention, an HD stream is recorded or reproduced on a DVD medium in real time using a file system including the local file area and the file area.

In the present invention, the local file area is characterized in that the stream information including the PAT & PMT information is stored separately.

In the present invention, the disc information area includes a disc name, a version number, and a sequence number for recognizing a DVD medium.

In the present invention, the program information area is characterized by including the program name, storage time, A / V PID, location information.

In the present invention, the location information is processed in sector units so that the file navigation information is directly accessed.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a format of a DVD file system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a disc information (HD Disc Info) 11 provided with information for recognizing a DVD medium such as a disc capacity, a version number, and information about a stored program, a program name, a storage time, A / A local file area 10 including a program info area 12 provided with program details such as V PID and reproduction related information; Index Files area 21 in which frame position information of a video stream is provided in a file for trick play, and Stream Files area 22 in which actual A / V streams are stored. And a file area 20 including a thumbnail files area 23 for providing a periodic still screen of the program and for providing visual information about the stream when a recording list is displayed on the screen. It is configured to include).

2 is a diagram illustrating a structure of a disc information area according to an embodiment of the present invention.

Referring to FIG. 2, the disc information area 11 of the local file area 10 recognizes the disc through the Disc Name 31, and also through the Version Number 32 the file system. You will see the version information of.

In addition, the sequence number 33 makes it possible to indicate the linkage between discs by designating the sequence number when recording one program on a plurality of media.

In addition, the storage capacity and free space information 34 for the brief information of the disk is included, and the size information is 32 bits to facilitate data communication with other modules. It is recorded in units.

That is, the disc information area 11 includes information about the capacity of the disc, version information, and stored programs, and provides information for recognizing the disc.

3 is a diagram illustrating a structure of a program information area according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the program information area 12 as shown in FIG. 3 (a) is an area representing comprehensive information of a program recorded on a DVD, and the nbProgram field 41 indicates the number of total recorded programs and indicates nbUsedByte ( Field indicates the storage capacity of the total recordings.

It also includes a record program track (MME_RECORD_PROGRAM_T) 43 as shown in FIG. 3 (b) and a DVD record track (MME_DVD_PROGRAM_T) 44 as shown in FIG. 3 (c).

The record program track 43 records all information related to the reproduction of the recording. Among them, a program association table (PAT) of a transport stream (TS) is recorded in an electronic program guide track (pEPG) 51. And information corresponding to a Program Map Table (PMT) (hereinafter referred to as PAT & PMT), the record program track 43 stores only the minimum data for reproduction.

In this case, the play related information includes information such as a program name, a storage time, an A / V PID, and the like, and by storing the play related information such as the PAT & PMT information separately, more broadcast streams can be stored.

The DVD record track 44 also contains positional information for all files on the DVD to enable access to the required files using the positional information during playback. That is, file navigation becomes possible.

Here, all the location information is calculated and processed based on the sector number, which has the effect of speeding up the recording & playback speed by loading the location information in the main memory and directly accessing the corresponding sector.

That is, the program information area 12 includes all information related to reproduction, such as a program name, a storage time, and an A / V PID, and has the A / V PID as program information. & No need to parse and store PMT information.

In addition, the existing DVD recording list has a specific file containing respective navigation information, and the present invention allows the navigation information to be obtained through the program information area 12 and the file in the program information area 12. Their physical location is stored.

In the present invention, HD stream data can be stored as if a file is recorded on a conventional DVD medium, and faster file & playback functions can be performed by accessing all file navigation information in sector units.

In addition, the DVD system is recognized by the file system proposed in the present invention to enable automatic recognition and playback of the HD stream.

4 is a block diagram illustrating a DVD RW and a PVR multifunction apparatus according to an exemplary embodiment of the present invention.

Referring to FIG. 4, an interface for connecting the first module 100 having the PVR function, the second module 130 for storing and playing back to a DVD medium, and the first and second modules 100 and 130. Connected to the means 120. The first module 100 includes a tuner / demodulator 101 for channel tuning and demodulation of a digital broadcast signal and an encrypted transport stream (TS). A stream controller (TS controller) 103 for transmitting to the TS (Encryption TS), a bus bridge unit (PCI / IDE Bus bridge) 105 connected to a system bus (PCI bus), and a bus bridge unit 105 A hard disk (HDD) 107 for buffering the transport stream transmitted through the system, a system memory (SDRAM) 109 for temporarily storing the transport stream, a central processing unit 111 for controlling each unit through a system bus, MPEG decoder 113 for reproducing the transport stream, and memory (SDRAM) 115 for temporary storage during reproduction.

The second module 130 includes a DVD controller 131 for controlling the DVD loader 135 and a DVD memory for temporarily storing data recorded and reproduced on a DVD medium by the DVD controller 131. SDRAM 133. The interface means 120 is composed of DPRAM (Dual-Port RAM). Referring to the accompanying drawings, a transport stream data control system in a DVD RW and PVR multifunction apparatus according to an exemplary embodiment of the present invention configured as described above will be described below.

First, as shown in FIG. 4, the multifunction apparatus is a combination of a first module 100 and a second module 130, and the first module 100 and the second module 130 are interface means 120. Are connected by means of data transmission and reception.

The first module 100 is a PVR module, the second module 130 is a digital video disk (DVD) read / write (RW) module, and the interface means 130 is, for example, a DPRAM (dual port). memory).

The first module 100 includes a tuner / demodulator 101, a stream controller 103, a bus / IDE bus bridge 105, a system memory 109, a CPU 111, and an MPEG decoder ( 113, the memory 115.

The tuner / demodulator 101 receives a broadcast signal through channel selection of a digital broadcast signal, converts the received broadcast signal into a digital transport stream (TS), and outputs the converted broadcast signal.

In addition, the stream controller 103 is connected to a system bus (PCI BUS) and performs PID (Packet ID) filtering of the demodulated transport stream under the control of the CPU 111, and encrypts for copy protection. Accumulate in the buffer.

In addition, the CPU 111 reads a certain amount of stream data through the PCI (peripheral component interconnect) bus 104 and temporarily stores the stream data in the system memory 109 and reads it again to connect the bridge unit 105 connected to the PCI bus 104. ) Is stored in the HDD 107.

Here, since the transport stream is encrypted by the stream controller 103, it is provided as a means capable of providing content protection for the HD stream without a separate encryption process. The stream data stored in the HDD 107 is stored as source data for transmission to the second module 130.

In addition, since the terrestrial HD stream is a transport stream (TS) format, buffering is required to store this transport stream format directly on a DVD-RW medium. In this case, the hard disk is used as a buffering means, and when stored in the hard disk, for example, a time stamp of 4 bytes and an encryption of TS 188 bytes are stored.

In addition, the CPU 111 transmits control data to the DVD controller 131 of the second module 130 in accordance with the interface state with the second module 130 for recording the data. In other words, control data is transmitted to make the data transmission possible.

The CPU 111 temporarily stores the stream data stored in the HDD 107 in the system memory 109 and then transfers control to the DVD controller 131 of the second module 130. At this time, the DVD controller 131 of the second module 130 reads the stream data stored in the system memory 109 of the first module 100 through the interface means 120 and then the DVD of the second module 130. Stored in the memory 133.

The DVD controller 131 of the second module 130 records the stream data stored in the DVD memory 133 on the DVD medium at a predetermined speed using the DVD loader 135. At this time, since data recorded on the DVD medium is encrypted stream data, copy protection is performed.

In this case, when recording to a storage medium (DVD, etc.), information about a program is also stored. A copy status flag of the program is present so that information such as copy never and copy once may be put together.

In addition, the interface means 130 connects the first module 100 and the second module 130, and the DPRAM is data transferred between the first module 100 and the second module 130 through buffering. Minimize the transmission time of data and make it possible to transmit / receive data in real time.

The interface unit 130 uses dual port ram (DPRAM) for high-speed data transfer between two processors (CPU, DVD controller), and divides the dual port RAM area into two channels. Transmission control, data transmission), and the data transmission channel transmits only the size information in units of blocks without adding additional transmission protocol data to improve data transmission efficiency. Here, the data transmission channel control information is performed through the transmission control channel.

On the other hand, the data recorded on the DVD medium of the second module 130 is reproduced in the reverse order. That is, the DVD controller 131 of the second module 130 reads data from the DVD medium and temporarily stores the data in the DVD memory 133 by using the DVD memory 133, and controls the CPU 111 of the first module. The CPU 111 stores the data stored in the DVD memory 133 in the system memory 109 and then stores the data in the HDD 107, decodes the data by the stream controller 103, and then decodes the MPEG decoder. Decode and play through (113).

In this way, while transport stream data received by a broadcast receiving device such as a PVR module is recorded on a disc medium of another module, the transport stream recorded on the disc medium can be read and played back, and the PVR module and the DVD RW can be read. By providing means for transmitting / receiving transport stream data at high speed between modules, it is possible to minimize delay time due to buffering and to guarantee real-time data transmission.

The right to use DPRAM, which is an interface means for connecting the PVR module and the DVD RW module, has the CPU controller of the PVR module or the DVD controller 131 of the DVD RW module depending on whether the system is in a playback mode or a recording mode.

In another embodiment, the received transport stream data may be stored in the HDD 107 and proceed to a mode capable of real time playback by the MPEG decoder 113. In this mode, the encryption process of the stream controller is omitted.

Such a complex system is a system that defines a format as shown in FIG. 1 to store an HD stream on a DVD medium, and records and plays back in real time according to the format.

Therefore, it is possible to exchange data with the PVR system, to use DVD media as a backup device, and to store HD streams on the DVD media.

So far, the present invention has been described with reference to the embodiments, and those skilled in the art to which the present invention pertains may implement embodiments of the present invention in a different form from the detailed description of the present invention within the essential technical scope of the present invention. Could be. Here, the essential technical scope of the present invention is shown in the claims, and all differences within the equivalent range will be construed as being included in the present invention.

According to the DVD file system for recording and reproducing HD streams according to the present invention, HD (High Definition) streams can be recorded and played back in real time on DVD media, and faster file recording is provided by sector-by-sector access to file navigation information. It has the effect of executing & playback function.

In addition, by recognizing a DVD medium with the file system of the present invention, there is an effect that enables automatic recognition and playback of HD streams.

Claims (6)

A disc information area provided with information for recognizing a DVD medium; A local file area including a program information area provided with program details; An index file area where frame position information of a video stream is provided within a file for trick play; A stream file area in which actual A / V streams are stored; And a file area comprising a thumbnail file area for providing a periodic still picture of the program and for providing visual information about the stream. The method of claim 1, And recording or playing back an HD stream on a DVD medium in real time using a file system including the local file area and the file area. The method of claim 1, The local file area of the DVD file system for recording and playback of the HD stream, characterized in that the stream information including the PAT & PMT information is separated and stored. The method of claim 1, And the disc information area includes a disc name, a version number, and a sequence number for recognizing a DVD medium. The method of claim 1, And the program information area includes a program name, a storage time, an A / V PID, and location information. The method of claim 5, And the position information is processed in sector units so that file navigation information can be directly accessed.

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