JP2008299959A - Device and method for reproduction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproduction device and a method for reproducing video or audio data even when data recorded in a recording medium cannot be read due to flaws, stains or dusts. <P>SOLUTION: The device for reproducing a video image is provided with a communication means for communicating with an external device via a network, a reading means for reading data recorded in a recording medium, a detection means for detecting a part of the recording medium unreadable by the reading means, and an acquisition means for obtaining, when the detection means detects the unreadable part, correction data for correcting the unreadable data by the communication means, from the external device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a playback apparatus and playback method for playing back video data or audio data.

  2. Description of the Related Art Conventionally, there is a reproduction apparatus that reads digital data recorded in a recording medium and reproduces video data and audio data. This type of playback device uses a DVD (Digital Versatile Disk) or other recording medium, reads the recorded data from the recording medium, and plays back video data and audio data. In addition, DVD recorders having a digital data recording function for recording media have become widespread.

Conventionally, with regard to this type of playback device, when a defect is found in video data recorded on a non-rewritable recording medium such as a DVD-ROM, correction data is downloaded from the server via the network, and the defective data is corrected. There has been a playback device that plays back video data in place of data (see, for example, Patent Document 1).
JP 2006-129169 A

  By the way, when the surface of the recording medium is scratched, or when dirt or dust is attached to the conventional reproducing apparatus, the recording data of the recorded part of the recording data recorded on the recording medium is recorded. Could not read. In this case, if the scratches and dirt are slight, video data and audio data can be reproduced by correcting the error of the data if the error correction code is included in the recorded data.

  However, there are limits to the errors that can be corrected with error correction codes, so video data and audio data cannot be reproduced with error correction when scratches or dirt are continuous over a certain section of the recording medium. .

  Conventional recording media, except for some recording media such as MD (MiniDisc) and MO (Magneto-Optical disk), are all optical discs such as CD (Compact Disc) and DVD, and optical discs such as HD DVD and Blu-ray Disc. Since the data recording surface is exposed, scratches, dirt, dust and the like are likely to be attached to the recording surface, and the places where they are attached are often continuous, so that the reproducing apparatus often cannot reproduce the video data.

  In such a case, if the recording medium on which the same recording data is recorded can be obtained by purchasing it again, the video data can be reproduced by using the recording medium. Some recording media are difficult to buy again.

  On the other hand, in recent years, with the spread of communication infrastructure such as ADSL (Asymmetric Digital Subscriber Line) and optical communication, a distribution service environment such as video and music in full-scale communication has been established. Under such circumstances, some playback apparatuses having a communication connection function have been put into practical use.

  When such a reproducing apparatus is used, data necessary for reproducing video data and audio data can be acquired via a network. However, since the data acquired via the network is a content unit such as the entire video such as the entire main part of the movie or the entire music, for example, the data capacity is large, and therefore, a considerable amount of time is required for data communication. For example, since an HD DVD recording medium has a recording capacity of 30 GB, a considerable amount of time is required for data communication even when high-speed optical communication using an optical fiber is used to acquire the entire content.

  Therefore, the present invention has been made to solve the above problems, and even when the recording data recorded on the recording medium cannot be read due to the influence of scratches, dirt, dust, etc., the video data or the audio data can be read in a short time. An object of the present invention is to provide a reproducing apparatus and a reproducing method for reproducing.

  In order to solve the above-described problems, the present invention provides a communication unit that communicates with an external device via a network, a reading unit that reads recording data recorded on a recording medium, and an unreadable location where the reading unit cannot read the recording medium. When the detection unit detects that there is an unreadable portion and the detection unit detects correction data for correcting unreadable data that cannot be read from the unreadable portion, the communication unit acquires correction data from the external device A playback device having an acquisition unit is characterized.

  Further, the present invention corrects unreadable data that cannot be read from the detected unreadable portion when it is detected that the unreadable portion that cannot read the recorded data recorded on the recording medium is present on the recording medium. Is obtained from an external device via a network, and a reproduction method for reproducing video data or audio data using the obtained correction data is provided.

  According to the present invention, it is possible to obtain a reproducing apparatus and a reproducing method for reproducing video data or audio data in a short time even when recorded data recorded on a recording medium cannot be read due to scratches, dirt, dust, or the like.

  Embodiments of the present invention will be described below. In addition, the same code | symbol is used for the same element and the overlapping description is abbreviate | omitted.

First Embodiment (Configuration of Video Playback Device)
A video playback apparatus 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the internal configuration of the video reproduction apparatus 1 together with the recording medium 203 and the server apparatus 204.

  As shown in FIG. 1, the video playback apparatus 1 stores digital format data (hereinafter referred to as “recording data”) that is recorded on a recording medium 203 such as an optical disk, for example, and is encrypted by a predetermined encryption method. Can be read.

  Also, when an unreadable portion (to be described later) is found on the recording medium 203, the video reproduction device 1 connects to a server device 204 as an external device via the Internet 202 and acquires correction data 21 (to be described later) from the server device 204. be able to.

  Then, the video reproduction apparatus 1 reproduces the video data S1 using the correction data 21 by the video reproduction program 11, and reproduces the audio data S2 by the music reproduction program 12.

  The video playback device 1 includes a hard disk drive unit 3, a disk drive unit 4, and a network interface (I / F) unit 5, all of which are connected to the bus 2.

  The hard disk drive unit 3 writes recording data to the magnetic disk rotating at high speed and reads the recording data from the magnetic disk.

  The hard disk drive unit 3 stores a video playback program 11 and a music playback program 12 and is provided with a prefetch buffer 13. The prefetch buffer 13 has a function as a data storage unit that stores recording data read by a prefetch process described later.

  The disk drive unit 4 reads and outputs recorded data from the recording medium 203, and has a function as a reading unit. The network I / F unit 5 has a function as a communication unit that executes communication with the server device 204 via the Internet 202.

  The video reproduction apparatus 1 includes a CPU (Central Processing Unit) 6, a memory unit 7, a ROM 8, and a video memory unit 9, all of which are connected to the bus 2. The CPU 6 is activated in accordance with the activation program read from the ROM 8 to the memory unit 7 and controls system initialization, system termination, and the like.

  The user input device 10 includes, for example, a keyboard and a mouse, and is an operation input means for a user to input desired data as operation input information. The user input device 10 has a function as a playback button 10a (see FIG. 2) described later, for example. is doing.

  Further, the CPU 6 executes the video reproduction program 11, decodes the video signal using the recording data read from the pre-read buffer 13 of the recording medium 203 or the hard disk drive unit 3, and performs predetermined image processing on the decoded video signal. To output video data S1.

  Further, the CPU 6 executes the music reproduction program 12, decodes the audio signal using the recorded data, performs predetermined audio processing on the decoded audio signal, and outputs the audio data S2.

  The memory unit 7 stores data and programs used when the CPU 6 operates. The ROM 8 stores a program executed by the CPU 6 such as a startup program. In the video memory unit 9, decoded (demodulated) video signals are sequentially written.

  In this embodiment, the video reproduction program 11 includes a data reading unit (data reading module) 11a, a video decoder (video decoding module) 11b, and a display driver (display control module) 11c, as shown in FIG. is doing.

  The data reading unit 11 a realizes a recording data reading function by the disk drive unit 4. As shown in FIG. 2, the data reading unit 11 a includes a prefetch processing unit 14, a reproduction instruction unit 15, a flaw detection unit 16, a regular media determination unit 17, and a data acquisition unit 18.

  The prefetch processing unit 14 realizes a prefetch process to be described later for the recording data recorded on the recording medium 203. The reproduction instruction unit 15 realizes reproduction processing of the video data S1 by the video decoder 11b and the display driver 11c using the recording data stored in the prefetch buffer 13.

  The scratch detection unit 16 has a function as a detection means for detecting that there is a portion where the recording data cannot be read (hereinafter referred to as “unreadable portion”) due to scratches, dust, dirt, etc. on the recording medium 203. Realize. In this embodiment, the disc was originally recorded at an unreadable location and could be read unless scratches, dirt, dirt, etc. were attached. The recording data that cannot be read by the drive unit 4 is set as unreadable data.

  The regular media discriminating unit 17 realizes a function as a media discriminating unit that discriminates whether or not the recording medium 203 is a regular media described later. The data acquisition unit 18 realizes a function as an acquisition unit that acquires the correction data 21 from the server device 204 when the flaw detection unit 16 detects that there is an unreadable portion.

  Then, the video decoder 11b performs a decoding process for decoding the encrypted video signal. The display driver 11c generates video data S1 from the video signal decoded by the video decoder 11b.

  In the present embodiment, the audio reproduction program 12 includes a data reading unit (data reading module) 12a, an audio decoder (audio decoding module) 12b, and an output (output control module) driver 12c, as shown in FIG. have.

  The data reading unit (data reading module) 12 a realizes a reading function of recording data supplied from the disk drive unit 4. The audio decoder 12b performs a decoding process for decoding the encrypted audio signal. The output driver 12c generates audio data S2 from the audio signal decoded by the audio decoder 12b. The data reading unit 12a also includes a prefetch processing unit, a reproduction instruction unit, a flaw detection unit, a regular media discrimination unit, and a data acquisition unit similar to the data reading unit 11a. The illustration is omitted.

(Configuration of server device)
Next, the configuration of the server device 204 will be described with reference to FIGS. As shown in FIG. 3, the server device 204 includes a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, a RAM (Random Access Memory) 303, a communication processing unit 304, a communication control unit 305, and a data storage unit 306. have.

  The server device 204 operates while the CPU 301 reads / writes data to / from the RAM 303 in accordance with a program stored in the ROM 302, while the communication control unit 305 operates the communication processing unit 304 in accordance with an instruction from the CPU 301. Data communication with the video reproduction apparatus 1 is performed.

  In the present embodiment, the server device 204 stores the correction data 21 shown in FIG. 2 in the data storage unit 306. The correction data 21 is data for the video reproducing device 1 to correct unreadable data that cannot be read from the unreadable portion when the video reproducing device 1 detects that the recording medium 203 has an unreadable portion. For example, several bytes of correction data 21a are transferred to the video reproduction device 1 by download d described later.

(Operation details of the video playback device)
Next, with reference to the flowchart shown in FIG. 5, an operation procedure when the video reproduction apparatus 1 reads the recording data from the recording medium 203 and reproduces the video data S1 will be described. FIG. 5 is a flowchart showing a playback procedure of the video data S1 performed according to the video playback program 11. In the following description, it is assumed that the recording medium 203 is stored in the disk tray of the disk drive unit 4 in advance.

  The video playback program 11 is activated when the user operates a playback button 10 a provided in the user input device 10. In the video reproduction program 11, first, the data reading unit 11a operates.

  When the data reading unit 11a is actuated, first, the regular media discriminating unit 17 is actuated to discriminate whether or not the recording medium 203 stored in the disc tray is a regular media (S1). Here, the regular medium means a recording medium that is normally acquired by the user through purchase or the like. For example, the regular media discriminating unit 17 discriminates whether or not the recording medium 203 is a regular media based on whether or not the read data includes code information indicating that the media is a regular media.

  In the data reading unit 11a, when the normal media determining unit 17 determines that the recording medium 203 is a normal medium, the operations from S2 to S10 are performed. When it is determined that it is not a medium, the operation ends without performing the operations from S2 to S10, and the video reproduction program 11 also ends.

  Next, the data reading unit 11a advances the operation to S2, and executes prefetch processing by the prefetch processing unit 14. This prefetching process is a process of reading the recording data from the recording medium 203 in advance and storing the read recording data in the prefetching buffer 13 when reproducing the video data S1. When the pre-read processing unit 14 finds an unreadable portion in the pre-read process, the pre-read processing unit 14 skips the unreadable data of the unreadable portion.

  Subsequently, the data reading unit 11a advances the operation to S3, and determines whether or not an unreadable portion is found during the pre-reading process by the scratch detection unit 16. If an unreadable location is found, the operation proceeds to S7 because it is detected that there is an unreadable location on the recording medium 203. Otherwise, the operation proceeds to S4 because no unreadable location is detected.

  In addition, when the data reading unit 11 a advances the operation to S <b> 4, the reproduction instruction unit 15 instructs the reproduction process using the recording data stored in the prefetch buffer 13. In this case, the video decoder 11b and the display driver 11c operate in response to an instruction from the playback instruction unit 15 to operate as playback means, perform playback processing using recorded data, and output video data S1.

  In the data reading unit 11a, when the process proceeds to S5 following S4, the prefetch processing unit 14 operates as a recording data discriminating unit, and determines whether or not there is a reproduction reference amount of recording data to be described later in the prefetch buffer 13. Determine. The data reading unit 11a executes S4 again when there is a reproduction reference amount of data in the prefetch buffer 13, but if not, the operation proceeds to S6.

  In the data reading unit 11a, when the operation proceeds to S6, it is determined whether or not the reproduction is finished (for example, when all the video data is reproduced and the user presses a reproduction stop button (not shown)). If the reproduction is not finished, the process returns to S2 and the above operation is repeated. If the reproduction is finished, the video reproduction program 11 is finished.

  On the other hand, when the operation of the data reading unit 11a proceeds from S3 to S7, the prefetch processing unit 14 performs an operation as a recording data discriminating unit, discriminates whether or not there is a reproduction reference amount data in the prefetch buffer 13, Based on the determination result, the reproduction instruction unit 15 controls the reproduction of the video data S1. In this case, when it is determined that the reproduction reference amount data is stored, the reproduction instruction unit 15 proceeds to S8, but when it is determined that the reproduction reference amount data is not stored, the operation is performed to S10. To proceed.

  Then, when the data reading unit 11 a advances the operation to S <b> 8, the reproduction instruction unit 15 instructs the reproduction using the recording data stored in the prefetch buffer 13. In this case, the video decoder 11b and the display driver 11c operate in response to an instruction from the reproduction instruction unit 15, and the video data S1 is output.

  When the operation proceeds to S10, the reproduction instruction unit 15 instructs the video decoder 11b and the display driver 11c to stop outputting the video data S1, and the video decoder 11b and the display driver 11c receive the instruction to receive the video data. The output of S1 is temporarily stopped.

  Further, when the data reading unit 11a advances the operation to S9 following S8 or S10, the network I / F unit 5 causes the data acquisition unit 18 to download d of the correction data 21 for correcting the unreadable data. To obtain the correction data 21a.

  In this case, the data acquisition unit 18 uses the network I / F unit 5 to send a recording data acquisition request including data (such as track and sector numbers) for specifying the position of the unreadable portion found on the recording medium 203 to the server device. 204.

  Then, the network I / F unit 5 performs communication processing with the server device 204, and among the correction data 21, the correction data 21a corresponding to the unreadable data (recording data that cannot be read from the unreadable portion of the recording medium 203) The data acquisition unit 18 acquires the correction data 21a.

  Further, the data acquisition unit 18 operates as a storage control unit, and the correction data 21 acquired from the server device 204 is stored in a corresponding part of the prefetch buffer 13 (a part that would have been stored if unreadable data was not found). Remember. The data acquisition unit 18 returns to S2 after executing S9.

  By doing as described above, the video reproduction apparatus 1 corrects unreadable data that cannot be read from the unreadable portion even if there is an unreadable portion due to scratches or dirt on the recording medium 203. Correction data 21 can be acquired from the server device 204. Therefore, the video data S1 can be reproduced even on the recording medium 203 with scratches, dirt, etc., and the user does not have to repurchase the recording medium 203 with scratches, dirt, etc. Yes.

  Further, since the video reproduction device 1 acquires only the correction data 21a of, for example, several bytes of unreadable data corresponding to the unreadable portion, not the data necessary for reproducing the entire video data S1, by the download d, Since the amount of data communication required is small, and download d is completed in a short time, the entire video data S1 can be reproduced in a short time.

  In this case, when reproducing the video data S1, the video reproduction device 1 performs a prefetch process, reads the record data recorded in advance on the recording medium 203, temporarily stores it in the prefetch buffer 13, and reads the record data therefrom. The video data S1 is reproduced.

  Therefore, the data amount of the recording data stored in the prefetch buffer 13 changes as shown in FIG. For example, as shown in FIG. 6A, when the recording data is read r1 from the recording medium 203 by the disk drive unit 4, and the read recording data is stored in the prefetch buffer 13, as shown in FIG. 6B. In addition, the amount of recording data stored in the prefetch buffer 13 increases.

  When the data amount of the recording data reaches the reproduction reference amount V0, the reproduction r2 of the video data is started and the data amount of the recording data stored in the prefetch buffer 13 is decreased from V0. When the data amount of the prefetch buffer 13 becomes V1 (V1 <V0), the disk drive unit 4 starts reading r1 of the recording data again, and the prefetch buffer 13 has the data amount V2 exceeding the reproduction reference amount V0. When r is stored, the reproduction r2 is started and the data amount in the prefetch buffer 13 decreases.

  At this time, it is assumed that the unreadable portion is found at time t1 and the correction data 21 is downloaded d, and the download d is completed at time t3.

  As described above, when an unreadable location is found, unreadable data in the unreadable location is skipped, so the data amount of the prefetch buffer 13 is V3 (V3> V1) during the skip period (t1 to t2). At time t2 when reading skip ends, the amount of data gradually increases.

  Then, the download d is completed at time t3, the video reproduction apparatus 1 acquires the correction data 21a, and the correction data 21a is stored in the prefetch buffer 13, so that the data amount of the prefetch buffer 13 increases at time t3. is doing. FIG. 6B shows a case where a dotted line graph does not find an unreadable portion, and a solid line graph where an unreadable portion is found.

  As described above, the video reproduction device 1 is provided with the prefetch buffer 13, performs prefetch processing before reproduction of the video data S1, stores the reproduction reference amount of recording data in the prefetch buffer 13, and then reproduces the video data S1. Has started.

  Since the pre-read buffer 13 is used to skip reproduction and download d when an unreadable portion is found, reproduction using recorded data can be continued during that time. It is desirable to set in consideration of the time required for d and the amount of recording data to be read by reproduction.

  As described above, the video reproduction device 1 performs the pre-reading process, so that even if an unreadable portion is found, the video data S1 can be continuously reproduced, and the reproduction is not immediately stopped.

  Therefore, even if an unreadable portion is found, the video reproduction device 1 can reproduce the video data S1 without waiting for the communication time required for downloading the correction data 21, and the video data S1 can be reproduced in real time. .

  The prefetch buffer 13 is set to have a storage capacity so that the reproduction reference amount data can be stored. Therefore, even if an unreadable portion is found on the recording medium 203 and the correction data 21 is to be downloaded d, the video data S1 can be reproduced using the recording data stored therein during the download d. You do n’t have to stop. Therefore, the video reproduction device 1 is not required to extend the time required for reproducing the video data S1.

  Furthermore, in the video reproduction apparatus 1, the recording data is read and the video data S1 is reproduced only when the recording medium 203 is a regular medium, and when the recording medium 203 is not a regular medium, these and the correction data 21 are downloaded d (S9). I am trying not to be. For this reason, for example, the user cannot obtain the recording medium 203 illegally, intentionally scratches or smudges the entire recording medium 203, and downloads all of the recorded data of that part. Yes.

  On the other hand, although the conventional recording medium 203 has an advertising effect by being placed in the store, the price is controlled by the store, so the price is likely to drop, and the producer of the video content may not be profitable. It was.

  On the other hand, data distribution via the Internet 202 does not incur a collection cost for correcting a defective recording medium 203 and has the advantage that the price can be controlled by the producer, but for the user, the video data S1. However, there was a drawback that it was necessary to download the data necessary for playback of the video for a long time.

  However, the video playback apparatus 1 according to the present embodiment is useful for both the video content provider and the user. That is, in the video reproduction apparatus 1, since the correction data 21 is acquired by the download d via the Internet 202, the recording medium 203 is unnecessary as long as the correction data 21 is obtained, and the possibility of a price drop can be eliminated. Further, since the correction data 21 is downloaded only with correction data 21a of, for example, several bytes corresponding to the unreadable data, the time required for the download d is greatly reduced, and the recording data can be acquired in a short time. .

  Note that the error correction processing described above includes, for example, a method using even parity bits. For example, when there is a bit string 50 as shown in FIGS. 7A and 7B, a correction bit (in this case, a parity bit) 51 for error correction is added to the last bit of the bit string 50 in advance. Keep it. In the case of the even parity method, correction bits 51 are added so that a certain section of data is an even number of bits.

  By doing so, as shown in FIG. 7A, if the data cannot be read because there is a scratch 52 in one place of the bit string 50, if the remaining data becomes an odd number, the data of the portion having the scratch 52 Is “1”, and when it is an even number, it can be determined to be “0”.

  However, as shown in FIG. 7B, if there is a continuous flaw 53, error correction cannot be performed as described above. In addition to this, there is an error correction process, but there is no difference that correction cannot be performed if scratches or dirt are continuous.

  It is possible to make the entire video invisible by scratching the control data portion or the location where the recording data at the initial stage of the video is recorded in the recording medium 203.

Second Embodiment The video playback device 1 according to the second embodiment is different from the video playback device 1 according to the first embodiment in that the data reading unit 11a is an accounting processing unit as shown in FIG. 19 is different, and the rest has the same configuration.

  The accounting processing unit 19 performs accounting processing for the data acquisition unit 18 to acquire the correction data 21 of unreadable data. Corresponding to this billing process, the server device 204 has a billing management unit 22 that manages whether or not the billing for the acquisition of the correction data 21 is performed so that the correction data 21 is provided only when billing is performed. is doing.

  Then, in the second embodiment, the video reproduction apparatus 1 reproduces the video data S1 according to the flowchart shown in FIG. The flowchart shown in FIG. 9 is different from the flowchart shown in FIG. 5 in that the data reading unit 11a executes S9 after S8 and S10, and then executes S9. .

  In this case, the data reading unit 11a proceeds to S11 following S8 or S10, and determines whether or not the billing processing unit 19 performs billing processing for acquiring the correction data 21 by downloading d. Here, when it is determined that the charging process is to be performed, the operation proceeds to S12, and the charging processing unit 19 performs the charging process for acquiring the correction data 21 by the data acquisition unit 18. If it is not determined to perform the billing process, the process ends. The data acquisition unit 18 ends the operation when S12 is executed.

  As described above, the video reproduction apparatus 1 according to the present embodiment can acquire the correction data 21 even when the recording medium 203 has an unreadable portion, similarly to 1 according to the first embodiment. Even on the recording medium 203 to which scratches, dirt, etc. are attached, the video data S1 can be reproduced, and it is not necessary to buy the recording medium 203 again. Moreover, since the download d is completed in a short time, the entire video data S1 can be reproduced in a short time.

  In particular, since the video reproduction device 1 in the embodiment performs the download d after performing the accounting process, the correction data 21 can be provided from the server device 204 for a fee, and the provision of the correction data 21 is a service. Can be realized.

  In each of the embodiments described above, when the video reproduction device 1 downloads the correction data 21 from the server device 204, the network I / F 5 needs to specify the address of the server device 204. 2) and 3).

  1) Recording the address of a server device (server device 204 or other server device (not shown)) for acquiring the correction data 21 in the recording medium 203. In this way, a server device that provides the correction data 21 can be divided for each type of the recording medium 203. In addition, although extra data is recorded on the recording medium 203, communication is less than the following 2) and 3).

  2) The network I / F 5 once accesses a server device different from the server device 204 and acquires the address of the server device 204 therefrom. In this case, the number of communications is one more than 1), but unnecessary data need not be recorded on the recording medium 203.

  3) It is set so that the video playback apparatus 1 can access the server apparatus 204 regardless of the type of the recording medium 203. In this way, the number of communications is only one as in the case of 1), but the load on the server device increases.

  The above description is the description of the embodiment of the present invention, and does not limit the apparatus and method of the present invention, and various modifications can be easily implemented. In addition, an apparatus or method configured by appropriately combining components, functions, features, or method steps in each embodiment is also included in the present invention.

It is a block diagram which shows the internal structure of the video reproduction apparatus concerning the 1st Embodiment of this invention with a recording medium and a server apparatus. It is a block diagram which shows the main internal structures of a server apparatus and the video reproduction apparatus which concerns on 1st Embodiment. It is a block diagram which shows the internal structure of a server apparatus. It is the figure which showed typically that correction data are downloaded in a video reproduction apparatus and a server apparatus. It is a flowchart which shows the operation | movement procedure when the video reproduction apparatus which concerns on 1st Embodiment reproduces | regenerates video data. FIG. 5 is a diagram schematically illustrating prefetch processing, where (a) illustrates a recording medium and a prefetch buffer, and (b) illustrates a change in the data amount of the prefetch buffer. It is the figure which showed the error correction process typically, (a) is a figure which shows the case where a damage | wound is 1 bit, (b) is a figure which shows the case where the damage | wound is continuing. It is a block diagram which shows the main internal structures of a server apparatus and the video reproduction apparatus which concerns on 2nd Embodiment. It is a flowchart which shows the operation | movement procedure when the video reproduction apparatus which concerns on 2nd Embodiment reproduces | regenerates video data.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Video reproduction apparatus, 3 ... Hard disk drive part, 6 ... CPU, 8 ... ROM, 11, 21 ... Video reproduction program, 11a ... Data reading part, 11b ... Video decoder, 11c ... Display driver, 13 ... Prefetch buffer, 14 ... pre-read processing unit, 15 ... reproduction instruction unit, 16 ... flaw detection unit, 17 ... regular media discrimination unit, 18 ... data acquisition unit, 19 ... billing processing unit, 301 ... CPU, 302 ... ROM, 303 ... RAM, 304 ... Communication processing unit, 302 ... communication control unit, 303 ... data storage unit

Claims (8)

A communication means for communicating with an external device via a network;
Reading means for reading the recording data recorded on the recording medium;
Detecting means for detecting that there is an unreadable portion that the reading means cannot read on the recording medium;
Acquisition means for acquiring, from the external device, correction data for correcting unreadable data that cannot be read from the unreadable portion when the detection unit detects that there is the unreadable portion. A reproducing apparatus characterized by that. Data storage means for storing the recording data read by the reading means;
Storage control means for storing the recording data read from the recording medium by the reading means in the data storage means;
2. The reproducing apparatus according to claim 1, further comprising reproducing means for reproducing the video data or audio data using the recording data stored in the data storage means. A recording data discriminating unit for discriminating whether or not the recording data is stored in the data storage unit;
When the recording data determining means determines that the recording data is stored in the data storage means, the reproducing means uses the recording data stored in the data storage means to use the video data or audio 3. The reproduction of the video data or audio data is stopped when data is reproduced and the recording data determination means determines that the recording data is not stored in the data storage means. Playback device. It further has medium discriminating means for discriminating whether or not the recording medium is a legitimately acquired regular medium,
The reading means reads the recording data when the medium determining means determines that the recording medium is the regular medium, and the recording means when the medium determining means determines that the recording medium is not the regular medium. 4. The reproducing apparatus according to claim 1, wherein no data is read. Charging means for performing charging processing for the acquisition means to acquire the correction data from the external device;
5. The playback apparatus according to claim 1, wherein the acquisition unit acquires the correction data when the charging processing unit performs the charging process.   6. The reproducing apparatus according to claim 1, wherein the reading unit skips reading the unreadable data when the detecting unit detects that there is the unreadable portion.   The playback apparatus according to claim 2, wherein the storage control unit stores the correction data acquired by the acquisition unit from the external device in the data storage unit.   Correction data for correcting unreadable data that cannot be read from the detected unreadable location when it is detected that there is an unreadable location on the recording medium where the recorded data recorded on the recording medium cannot be read. And reproducing the video data or the audio data using the obtained correction data.

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