KR20100050193A - Data reproducing method and apparatus of optical disc - Google Patents

Abstract

PURPOSE: Data reproducing method and apparatus of an optical disc are provided to prevent intermittent reproducing interruption when reproducing the video, because entire data files could be stored even if there are defects in some data files. CONSTITUTION: Data reproducing method of an optical disc comprises the following steps. The file system within an optical disc is analyzed to determine whether there is stream data. The information on where the stream data within the optical disc exists is created and stored(S100). The stream data comprises video data. The information on the area in the optical disc comprises address list information. The file system analysis uses a file extension.

Description

DATA REPRODUCING METHOD AND APPARATUS OF OPTICAL DISC}

The present invention relates to a data reproducing method and a reproducing apparatus of an optical disc for managing a defect of an optical disc.

In the optical disk, there may be a physical defect caused by scratching or the like, and thus a still or hold phenomenon of an image screen may occur when the optical disk is reproduced. Since data is recorded / reproduced in sectors and blocks in a disc such as a CD, a DVD, and a BD, a defective area must also be managed in sectors or blocks in a plurality of sectors. In order to manage such a defective area, a defect list having information on the defective area and a replacement area replacing the defective area is recorded in the lead-in area and the lead-out area of the optical disc. The optical disk driver manages defects by reading a defect list recorded on the disc at disc loading so that the defect area is not included in recording / reproducing or updating the defect list to include the additionally found defect area.

The present invention relates to a method and an apparatus for reproducing an optical disc including stream data, which aims to quickly reproduce stream data by managing defects in the optical disc.

According to an embodiment of the present invention, a data reproducing method of an optical disc includes analyzing a file system in an optical disc to determine whether stream data exists and whether the stream data is present in the optical disc. Generating and storing information about the region.

In addition, the stream data includes video data, and the information about the area in the optical disc includes address list information.

File system analysis can use the file extension.

The data reproducing method of the optical disc further includes receiving a data transfer request from a host and reading information on an area in which the stream data in the optical disc exists, which is stored in the optical disc.

The method may further include determining whether the data requested by the host is stream data by reading information about the region.

If the data requested by the host is stream data, the method further includes setting the number of retry attempts to repeatedly read the stream data to a value smaller than a preset retry reference number.

If there is a defect in the stream data, the method may further include retrying within a range in which the number of retries does not exceed the set value.

In addition, when it is determined that there is a defect in the stream data and the reproduction error, the stream data may be changed to null data or error data and transmitted to the host.

According to another aspect of the present invention, there is provided an apparatus for reproducing an optical disc, including: an optical pickup for detecting a data signal by irradiating light onto the optical disc; and analyzing whether a file system in the optical disc is present. And a controller configured to generate information about an area in the optical disc in which the stream data exists, and a memory to store information about the area generated by the controller.

According to the method and device for reproducing an optical disc according to the present invention, the interruption phenomenon is reduced when the video screen is reproduced, thereby enabling continuous reproduction. It is also possible to copy or store the entire data file even if a defect exists in a part of the data file in the optical disc.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

The terminology used in the present invention was selected as a general term that is widely used at present, but in some cases, the term is arbitrarily selected by the applicant, and in this case, the meaning of the term is described in detail in the description of the present invention. The present invention should be understood as meanings other than terms.

The present invention is applicable to all optical discs such as compact discs (CDs), digital versatile discs (DVDs), blu-ray discs (BDs), high definition DVDs (HD-DVDs), and the like.

1 is a schematic flowchart of a data reproduction method of an optical disc according to an embodiment of the present invention.

As shown in FIG. 1, information about an area where stream data exists in an optical disc is generated and stored (S100), and when it is determined that there is a defect in the stream data during playback, the stream data is changed to a certain type of data. To transmit to the host (S200). In particular, in the case of the present invention, the step S100 may be performed not only by the application in the PC, but also by the optical disc drive itself. Operation S100 will be described later with reference to FIG. 2 and operation S200 will be described later with reference to FIG. 4.

FIG. 2 is a flowchart illustrating an example of a process of generating and storing information about an area where stream data in an optical disc exists (S100).

As shown in FIG. 2, when the optical disc is loaded (S110), it is determined whether the file system used for the optical disc meets the standard (S120). For example, it is determined whether a DVD or a BD corresponds to a UDF, and a CD corresponds to an ISO9660. If the file system conforms to the standard, the file system in the optical disk is analyzed to determine whether stream data exists in the optical disk (S130).

File system analysis can be done via extension of data files present on the optical disc. As shown in Fig. 3, a stream data file and a general data file are mixed in the optical disk. If the extension names of the data files existing on the optical disc relate to video and audio information such as MPEG, MP3, AVI, and DIVX, it can be determined that the stream data exists. On the other hand, if there is a file having an extension name except stream data files such as TXT and DAT, it may be determined as a general data file.

If it is determined that the stream data exists in the optical disc (S140), information about an area in the optical disc in which the stream data exists is stored (S150). For example, address list information of a corresponding area where stream data exists in an optical disk may be generated and then stored. If it is determined that no stream data exists in the optical disc, file system analysis is terminated.

4 is a flowchart illustrating a process (S200) of changing stream data into data of a predetermined form and transmitting the same to a host.

As shown in FIG. 4, after receiving a data transmission request from the host (S210), information about an area in which the stream data in the optical disk, which is stored in the optical disk, exists, is read (S220). If information about the area is stored in the form of an address list, the address can be read. It is determined whether the data requested by the host is stream data by reading information on the corresponding area (S230). That is, it is possible to determine whether the data requested by the host is stream data by determining whether an address section in the optical disk requested by the host exists in the stored address list.

If the data requested by the host is the stream data, the number of retry attempts to repeatedly read the stream data is set to a value smaller than the preset retry reference number (S240). The number of retries is set in advance before the host is notified of a defect in the optical disc because the optical disc is defective. In particular, in the case of stream data, the number of retries is set to a value smaller than the reference number.

In the case of stream data, an incomplete image can be displayed to the user in the form of a screen break or a mosaic even if the data cannot be read due to a defect of the optical disc. Therefore, even if the specific data cannot be read, it does not interfere with the reproduction of the entire data. Therefore, in case of the stream data file, the number of retries does not need to be set as high as that of normal data file reproduction.

Subsequently, a defect exists in the optical disc, and it is determined whether data requested by the host can be reproduced (S250). If data reproduction is possible, the host transmits the requested data to the host (S280). If a defect exists, a retry is performed to reproduce the part of the stream data in which the defect exists. It is determined whether the number of retries exceeds the set value (S260). If the number of retries is not exceeded, retries continue within the range not exceeding.

If the number of retries exceeds the set value, it can be judged that it is difficult to play the part of the stream data even after retries. In this case, the data requested by the host may be null data or error data. Change to a predetermined form of data and transmit it to the host (S270).

When the data requested by the host corresponds to general data instead of stream data in step S230, unlike the stream data, the number of retries is set to a value larger than the preset reference number (S340). In the case of general data, if the playback device cannot read the specific data due to a defect of the optical disk, it may interfere with reading the next data, so it tries to read the specific data repeatedly by reading or changing the speed. Therefore, the number of retries is set to a large value. In particular, the number of retries is set in advance before the optical disc is defective and the host is notified of the defective state.

Subsequently, a defect exists in the optical disc, and it is determined whether data requested by the host can be reproduced (S350). If data reproduction is possible, the host transmits the requested data to the host (S280). If a defect exists, a retry is performed to reproduce the part of the stream data in which the defect exists. If it is determined that the number of retries exceeds the set value (S360), the number of retries continues to be retried within the range not exceeding.

If the number of retries exceeds the set value, it may be determined that reproducing the corresponding stream data part is difficult even after retries. At this time, a reproduction error message is transmitted to the host and terminated (S370).

In the case of normal data, the number of retries in case of playback error is high. In case of an optical disc failure, the response speed to the host is slowed. Since the data is transmitted to the host, the response speed to the host is increased. In the case of stream data, in order to increase the response speed to the host, the number of retries can be set smaller than the reference value, and the speed change can be limited. By distinguishing such a stream data file and a general data file, when a defect occurs in an optical disc, there is a real advantage that the response speed is increased in a different manner in response to the host of the playback apparatus.

5 is a block diagram showing a data reproducing apparatus 500 according to an embodiment of the present invention.

As shown in FIG. 5, the data reproducing apparatus 500 includes a pickup unit 10, a servo 12, a controller 14, a signal processor 16, a memory 18, and an interface 20.

The pickup unit 10 includes a laser diode (LD) therein to record data on the surface of the recording medium or to read a signal reflected from the surface of the recording medium.

The servo 12 controls tracking and focusing operations of the pickup 10 based on a control signal generated from the controller 14.

The control unit 14 generates a control signal for controlling the tracking and focusing operations of the pickup unit 10 from the signal input through the signal processing unit 16.

The control unit 14 according to an embodiment of the present invention analyzes the file system in the optical disk to determine whether there is stream data, and generates information about an area in the optical disk where the stream data exists. When the control unit 14 receives the data transmission request from the host, the control unit 14 also reads information on the area in which the stream data stored in the optical disc exists and determines whether the data requested by the host is the stream data. When the data requested by the host is stream data, the controller 14 sets the number of retry attempts to repeatedly read the stream data to a value smaller than the preset retry reference number, and sets the number of retries. Control to retry within the range. In addition, when failing to read the stream data, null data or error data is transmitted to the host.

The signal processor 16 receives a signal read out from the pickup unit 10 when the data is reproduced, restores the signal to a desired signal value, and modulates the data to be recorded on the recording medium 600 when the data is recorded. It modulates and delivers to the pickup unit 10.

The memory 18 temporarily stores management information and the like in the optical disk or performs a buffer function for temporarily storing data to be reproduced. The control unit 14 stores information about an area in the optical disk in which the stream data generated by the control unit 14 exists.

The interface 20 receives a user's playback command from the main controller 600 and transmits the control command to the controller 14 so that the controller 14 controls each component.

The main controller 600 transmits a playback command to the interface 20 of the playback apparatus 500 and controls the entire system. The main controller 600 may be a main controller of a computer, a server, an audio device, or a video device. The playback apparatus 500 according to the embodiment of the present invention is applicable to both an optical drive and a player utilized as a single product mounted and operated inside a PC.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings, and the present invention is also provided. Naturally, it belongs to the range of.

1 is a schematic flowchart of a data reproduction method of an optical disc according to an embodiment of the present invention;

2 is a flowchart illustrating an example of a process of generating and storing information regarding an area in which stream data exists in an optical disc (S100).

3 is a schematic diagram showing a file structure in which a stream data file and a normal data file are mixed in an optical disk.

FIG. 4 is a flowchart illustrating a process (S200) of changing stream data into data of a predetermined form and transmitting the same to a host.

5 is a block diagram showing a data reproducing apparatus 500 according to an embodiment of the present invention.

Claims (14)

Analyzing the file system in the optical disc to determine the presence of stream data; And And generating and storing information about an area in which the stream data in the optical disc resides. The method of claim 1, And the stream data includes image data. The method of claim 1, Information relating to an area in the optical disc includes address list information. The method of claim 1, The file system analysis is a data reproduction method of an optical disc using a file extension. The method of claim 1, Receiving a data transfer request from a host, and reading information on an area in which the stream data in the optical disc exists, stored in the optical disc. The method of claim 5, And reading information about the area to determine whether the data requested by the host is stream data. The method of claim 6, If the data requested by the host is stream data, setting the number of retry attempts to repeatedly read the stream data to a value smaller than a preset retry reference number; How to play. The method of claim 7, wherein And retrying within a range in which the number of retries does not exceed the set value when a defect exists in the stream data. The method of claim 8, And when the stream data is determined to be a reproduction error and changes the stream data to null data or error data, and transmits the stream data to the host. How to play. An optical pickup for irradiating light to the optical disc to detect a data signal; A controller for analyzing a file system in the optical disc to determine whether stream data exists and to generate information about an area in the optical disc where the stream data exists; And And a memory configured to store information about the area generated by the controller. The method of claim 10, The control unit is a data reproducing apparatus of the optical disk for receiving a data transfer request from the host. The method of claim 11, If the data requested by the host is stream data, the controller controls the number of retry attempts to repeatedly read the stream data to set the number of retries to a value smaller than a preset retry reference number. Playback device. The method of claim 12, And the control unit retries within a range in which the number of retries does not exceed the set value. The method of claim 13, The control unit, And reconstructing the stream data into null data or error data and transmitting the stream data to the host when a defect exists in the stream data.

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