JP3901183B2 - Disc player - Google Patents

Description

  The present invention relates to a disc playback device, and more particularly to a disc playback device that outputs data read from a DVD to a signal processing unit including a decoder through a buffer when data is played back on a DVD (digital Versatile Disc).

  Video-DVD records data in the video format according to the video mode. The Video format is a widely used format because it has a feature that data configured according to it has excellent reproduction compatibility.

  A plurality of titles are recorded on the Video-DVD. Here, the title refers to a temporally continuous data group to be reproduced, such as a TV (television) broadcast program. Each title has one or a plurality of VOBUs (Video Object Units) in a predetermined storage area of Video-DVD. The VOBU generally includes an Nvpck (Navigation Pack) that is positioned at the head of the VOBU and stores the size data of the VOBU and a series of (continuous) meaningful data. This collective data includes various data such as video data, audio data, and character data. The size of the VOBU is variable.

  When data is reproduced from a Video-DVD in which such data is recorded, the data read from the DVD is temporarily buffered in a predetermined memory, and after being subjected to predetermined processing, it is read from the memory. The data is output to a signal processing unit such as an MPEG (Motion Picture Experts Group) decoder.

  Conventionally, in order to send VOBU to an MPEG decoder, the following procedure has been taken. First, when a title of a program to be reproduced is designated, data reading is started from a reading start position on the DVD of the designated title. First, Nvpck located at the head of the VOBU at the read start position is read, information in the read Nvpck is analyzed, and the size of the VOBU is determined based on the analysis result.

  Thereafter, based on the determined size, the entire VOBU is read from the DVD and written into a memory as a buffer. Thereafter, the data is read from the buffer memory in units of VOBU and output to the MPEG decoder. This is repeated in the same manner for each of all VOBUs of the designated title.

For example, Patent Document 1 discloses a technique in which data is read from a DVD and stored once in a memory of a buffer when data is reproduced from the DVD, and then the data stored in the memory is decoded.
JP 2002-252832 A

  In a conventional DVD playback device or the like, while the CPU processing speed is not sufficient, the memory capacity that can be used for playback is sufficient, so that the maximum size of the assumed VOBU can be stored sufficiently. It was easy to prepare a buffer memory. Therefore, as described above, first, Nvpck is read to check the size of the VOBU, and then the data for the checked size (the entire VOBU) is buffered in the main body memory, and then the memory contents are sent to the MPEG decoder. The procedure could be adopted.

  However, in recent years, it is necessary not to prepare an extra memory capacity in order to keep the unit price of the DVD player itself low. Further, recent CPUs have sufficient processing performance even at a low price. Therefore, it is possible to efficiently read data from a Video-DVD and output it to a signal processing unit such as an MPEG decoder while avoiding an increase in the unit price of the apparatus by using an extra memory capacity. It has been desired to provide such a DVD playback device.

  However, in Patent Document 1, it is possible to analyze the amount of data for each predetermined unit of data in the memory and to decode the data in the memory in units of pictures such as an I picture, a P picture, and a B picture along with this analysis. As shown, no proposal has been made to increase the processing speed while reducing the memory capacity for buffering.

  SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a disc reproducing apparatus that can efficiently read data from a disc medium.

According to one aspect of the present invention, there is provided a disc playback apparatus that reads out and reproduces the target information from a disc medium on which target information including one or a plurality of data units having a series of data is recorded.
A buffer having one or a plurality of predetermined storage areas of variable size;
Reading means for collectively reading data in units of size of the predetermined storage area from the target information of the disk medium and storing the data in each of the one or more predetermined storage areas of the buffer;
Output means for reading the data read by the reading means and stored in the one or more predetermined storage areas for each data unit and outputting the data to a data reproducing section prepared in advance;

  Therefore, when the target information is read from the disk medium and reproduced, the data in the size unit of the predetermined storage area of the buffer is collectively stored in the reading medium from the disk medium and stored in each of one or more predetermined storage areas of the buffer medium. To do. Then, the data stored in one or a plurality of predetermined storage areas of the buffer is read out and output to the data reproducing unit for each data unit for reproduction processing.

  Therefore, the size of data to be read from the disk medium at once is not limited to the size of the data unit for reproduction, but can be a size depending on the size of the predetermined storage area of the buffer. it can. As a result, by changing the size of the predetermined storage area, the number of times of reading from the disk medium by the reading means can be easily changed, so that the efficiency of data reading from the disk medium can be easily achieved.

  Further, the size of the predetermined storage area can be variably set according to the size of the empty storage area of the apparatus at the time of data reproduction or the like, so that the memory can be effectively used.

Preferably, the data unit includes size information indicating the size of the data unit;
The output means includes
Size search means for searching the data read by the reading means and stored in the one or more predetermined storage areas, and reading the size information;
The data read by the reading means and stored in the one or more predetermined storage areas is read for each size indicated by the size information read by the size searching means.

  Therefore, when a data unit is read from the predetermined storage area to the data reproducing unit, it can be read for each size of each data unit indicated by the retrieved size information.

Preferably, the data reproduction unit performs reproduction processing for each data unit,
When the data of the same data unit is divided and stored in the plurality of predetermined storage areas by the reading means, the output means is continuously divided from the plurality of predetermined storage areas to the divided data of the same data unit. Data is read and output to the data reproducing unit.

  Therefore, if one data unit cannot be stored in one predetermined storage area of the buffer depending on the size of the predetermined storage area, the data of the data unit is divided and stored in a plurality of predetermined storage areas. Then, since the data divided by the data unit is read continuously from the plurality of predetermined storage areas and output to the data reproduction unit, the data reproduction unit can be stored in one data unit even in the divided storage state. Data can be input continuously.

  Preferably, exclusive control is performed on access to data stored in one or a plurality of predetermined storage areas.

  Therefore, it is possible to avoid the data in the predetermined storage area being overwritten with the read data from the disk medium by the reading means before the reading to the data reproducing unit by the output means is completed.

  Preferably, the output unit reads data for each data unit and outputs the data unit to the data reproduction unit, and the reading unit collectively collects data in units of size in the predetermined storage area from the target information of the disk medium. A process of storing each of one or a plurality of predetermined storage areas different from the predetermined storage area from which data is read by the output means of the buffer is executed in parallel.

  Therefore, the reproduction speed is improved by parallel processing in which data read from the disk medium by the reading means is stored in one predetermined storage area while data is read out from the data reproducing unit by the output means in the other predetermined storage area. Can be improved.

  Preferably, each time a reproduction process is started, the one or a plurality of predetermined storage areas having a size based on the size of an empty storage area in the disk reproduction apparatus are set in the buffer.

  Therefore, the size of one or a plurality of predetermined storage areas can be variably set according to the size of the empty storage area at the start of the reproduction process, and the memory in the apparatus can be used effectively.

  Preferably, the target information is recorded on a disc according to a video format, and the data unit is a video object unit.

  Preferably, the size of the predetermined storage area is set irrespective of the size of the data unit. Therefore, since the size of the predetermined storage area is not limited by the size of the data unit, the versatility of the data reading procedure for reproduction using the predetermined storage area is enhanced.

  If the size of data read from the disk medium at each time is the size of the data unit, the predetermined recording area must have the maximum size assumed for the data unit if the size of the data unit is variable. However, depending on the size of the data unit to be read, an unused area may be generated in the predetermined storage area, which hinders effective use of the memory. On the other hand, in the above-described invention, since the size of the predetermined storage area is independent of the size of the data unit, the effective use of the memory is not prevented in this way.

  Preferably, a recording unit for recording data on the disc is further provided.

Further, the following disc playback method is provided. The disc playback method is a method of reading and reproducing the target information from a disc medium on which target information including one or a plurality of data units having a series of data is recorded in a disc playback device,
The disc player has a buffer having one or more predetermined storage areas of variable size,
Disc playback method
A step of collectively reading out data in units of size of the predetermined storage area from the target information of the disk medium and storing the data in each of the one or more predetermined storage areas of the buffer;
An output step of reading the data read by the reading step and stored in the one or more predetermined storage areas for each data unit and outputting the data to a data reproducing unit prepared in advance in a disk reproducing device;
The size of the predetermined storage area is set regardless of the size of the data unit.

  According to the present invention, the size of data to be collectively read from the disk medium at a time is not limited to the size of the data unit for reproduction, and the size depends on the size of the predetermined storage area of the buffer. can do. As a result, since the number of times of reading from the disk medium can be easily changed by changing the size of the predetermined storage area, it is possible to easily improve the efficiency of data reading from the disk medium including shortening of the seek time.

  Embodiments of the present invention will be described below with reference to the drawings.

  In this embodiment, when reproducing data from a DVD, a DVD reproducing apparatus is provided that can read data from a DVD and efficiently output it to a signal processing unit including a decoder. Here, the DVD to be reproduced is assumed to be a Video-DVD having Nvpck in the VOBU, but is not limited to this. In other words, the DVD may be a DVD in which data is recorded according to a format having size information of the data group in a series of meaningful data groups for reproduction such as VOBU.

  FIG. 1 is a block diagram of a DVD playback apparatus according to an embodiment of the present invention. Referring to FIG. 1, the DVD playback apparatus includes a control unit 3 composed of a CPU for centrally controlling and monitoring each unit of the apparatus, a disk control unit 9 for controlling access to the DVD 7, a signal such as a digital TV broadcast. For receiving a broadcast signal output from the antenna 11, a TV tuner unit 13 for extracting a signal of a desired channel, and an A / for inputting an audio signal or a video signal from an external device (not shown). V input unit 15, encoding unit 17, decoding unit 19, output unit 21, key input unit 23 including a plurality of keys for a user to input various information and instructions externally, and display for displaying various information 25, ROM (Read Only Memory) 27 and RAM (Ran) for storing data and programs accessed by the CPU of the control unit 3 dom Access Memory) 29, and a high-speed data bus 31 for connecting these components.

  A DVD 7 is detachably mounted on the disk control unit 9, and the disk control unit 9 accesses the loaded DVD 7 to read / write data.

  When recording data on the DVD 7, for example, when recording data of a TV broadcast program or data of a signal input via the A / V input unit 15, a desired program input via the antenna 11 and the TV tuner unit 13 is recorded. The signal or the video signal input via the A / V input unit 15 is encoded by the encoding unit 17 according to, for example, MPEG (Motion Picture Experts Group), and is provided to the disk control unit 9 as data. Records the data on the DVD 7 under the control of the control unit 3.

  When reproducing data from the DVD 7, the disc controller 9 reads the data of the designated title from the DVD 7 under the control of the controller 3. The read data is given to the decoding unit 19. The decoding unit 19 decodes the given data in accordance with MPEG, and a signal obtained as a result of the processing is output to a TV receiver (not shown) via the output unit 21, and a video according to the signal is displayed here. Or audio output.

  A procedure for reproducing data from the DVD 7 will be specifically described.

  When reproducing data from the DVD 7, the segment unit reading unit 35, the VOBU size determination unit 37, the output unit 39 to the VOBU decoder, and the data buffer 33 function in the control unit 3. The segment unit reading unit 35, the VOBU size determination unit 37, and the output unit 39 to the VOBU decoder are realized by the control unit 3 reading and executing a program prepared in advance in the ROM 27.

  The data buffer 33 is a memory area in the control unit 3 that can be prepared on the DVD playback device side. The data buffer 33 has a capacity such that, for example, when the data reproduction from the DVD 7 is instructed by the user via the key input unit 23, the CPU of the control unit 3 sets in the empty area of the memory area at that time. It is a variable buffer.

  As shown in FIG. 2, the data buffer 33 has one or more continuous predetermined storage areas. Here, this continuous predetermined storage area is referred to as a segment, and it is assumed that the data buffer 33 has segments 50 and 51 for the sake of simplicity. The size of each segment is determined in accordance with the empty memory size of the DVD reproducing apparatus at that time, that is, the size of the data buffer 33. The size of the segments 50 and 51 may be the same or different. The segment unit reading unit 35 has data indicating the sizes of the segments 50 and 51. Based on the segment size data, the segment unit reading unit 35 reads data from the DVD 7 in units of segments.

  Here, the DVD 7 is a Video-DVD, and as described in the prior art, for each title, as shown in FIG. 2, one or a plurality of VOBUs 7i (i = 1, 2, 3,..., N ) Continuously. Each VOBU 7i has Nvpck 8i at its head. Here, the Nvpck 8i stores information on the data size of the VOBU 7i. Here, Nvpck 8i is assumed to be located at the head of VOBU 7i, but the position may be anywhere within VOBU 7i. Since the Nvpck 8i has identification information indicating that it is a navigation pack, the VOBU size determination unit 37 can search the VOBU 7i or the segment to identify the pack having the identification information as Nvpck 8i.

  At the time of reproducing data from the Video-DVD 7, the control unit 3 reads and reads out data of the same size as the segment 50 by the segment unit reading unit 35 from the reading start position of the designated title in the Video-DVD 7 The stored data is stored in the segment 50 of the data buffer 33 via the disk controller 9. Thereafter, the reading start position is updated to a position advanced by the size of the segment 50. It is assumed that the segment unit reading unit 35 knows the sizes of the segments 50 and 51 in advance, and the segments 50 and 51 have the same size for the sake of simplicity.

  Subsequently, the segment unit reading unit 35 collectively stores the data corresponding to the size of the segment 51 in the segment 51 of the read data buffer 33 from the read start position after updating the Video-DVD 7. Thereafter, the reading start position is updated to a position further advanced by the size of the segment 51.

  When it is determined that data has been stored in the segments 50 and 51, the CPU of the control unit 3 sets the read position of the segment 50 to the head of the segment 50. The VOBU size determination unit 37 searches for the Nvpck 81 in the first VOBU 71 of the segment 50, analyzes the information, and determines the data size of the VOBU 71 based on the analysis result. When the data size is determined, the output unit 39 to the decoder of the VOBU reads the data for the determined size from the head of the segment 50 and outputs it to the decoding unit 19.

  Subsequently, the VOBU size determination unit 37 analyzes the next Nvpck 82, determines the size of the VOBU 72 based on the analysis result, and the output unit 39 to the VOBU decoder segments the data (VOBU 72) for the determined size. 50 is read out and output to the decoding unit 19.

  Subsequently, the VOBU size determination unit 37 analyzes the next Nvpck 83, determines the size of the VOBU 73 based on the analysis result, and the output unit 39 to the VOBU decoder segments the data (VOBU 73) for the determined size. 50 is read out and output to the decoding unit 19.

  At this time, as shown in FIG. 2, the VOBU 73 is divided and stored in segments 50 and 51 with the address 90 in the middle as a boundary. That is, the head side data 731 from the head of the VOBU 73 to the address 90 is stored in the segment 50, and the terminal side data 732 from the address 90 to the end of the VOBU 73 is stored in the segment 51.

  Therefore, the output unit 39 to the decoder of the VOBU is in a state where the size of the remaining data that can be read from the segment 50 is small compared to the data size of the VOBU 73 determined based on the information of the Nvpck 83. The head side data 731 is output to the read decoding unit 19, and then the remaining data of the VOBU 73, that is, the above-described end side data 732 is given to the read decoding unit 19 from the head of the next segment 51.

  Next, the VOBU 74 is read from the segment 51 and output to the decoding unit 19 in the same procedure. Further, the next VOBU 75 is in the same situation as the VOBU 73 described above. At this time, when the head side data is output to the decoding unit 19 with respect to the VOBU 75, all the data of the segments 50 and 51 have been output to the decoding unit 19, so that the segment unit reading unit 35 corresponds to the next segment 50. The amount of data and the amount of data corresponding to the segment 51 are collectively read from the DVD 7 and written to the segments 50 and 51 of the data buffer 33, respectively.

  As a result, since the termination side data of the VOBU 75 is stored at the head of the segment 50, the termination side data is read out by the output unit 39 to the decoder of the VOBU and output to the decoding unit 19. Thereafter, according to the same procedure, an operation of reading data from each segment of the data buffer 33 in units of VOBU and outputting it to the decoding unit 19 is performed.

  The decoding unit 19 decodes in units of VOBU. That is, when it is detected that the amount of data input from the data buffer 33 has reached the data amount of one VOBU, the VOBU is decoded and an analog signal as a result of the processing is given to the output unit 21. The input of the data amount of one VOBU is detected based on the comparison result by comparing the Nvpck size information of the VOBU with the size of the input data. Therefore, when inputting the head side data, the decoding unit 19 detects that the data of one VOBU has been input at the time of inputting the terminal data to be given subsequently. At this time, the decoding process is started for the VOBU. To do.

  A data reading procedure through the data buffer 33 at the time of data reproduction from the DVD 7 is shown in FIG. The flowchart of FIG. 3 is stored in advance in the ROM 27 as a program, and when data reproduction for a desired title is designated via the key input unit 23, the control unit 3 reads and starts the program from the ROM 27 and executes it. In the course of this execution, the functions of the segment unit reading unit 35, the VOBU size determination unit 37, and the output unit 39 to the VOBU decoder are realized. In the procedure of FIG. 3, it is assumed that only the segment 50 is set in the data buffer 33 for the sake of simplicity.

  First, when the program is started, the control unit 3 secures the data buffer 33 and allocates (declares) the segment 50 here (step S (hereinafter simply referred to as S) 1). This allocation may be performed every time the program is started, or the data buffer 33 may be secured in advance and the segment 50 may be fixedly provided.

  Next, the control unit 3 obtains a reproduction start position (data reading position) on the DVD 7 of the title designated via the key input unit 23 (S3). Management information is stored in a predetermined recording area of the DVD 7, and this management information includes data of a title reproduction start position and a size (reading end position), which are data reading start positions for each title. The control unit 3 acquires the reproduction start position of the designated title by acquiring this management information from the DVD 7 via the disc control unit 9.

  When the control unit 3 obtains the title reproduction start position, the title reproduction start position is set as the reading position from the DVD 7 via the disc control unit 9 and data reading is started (S5). After that, as in VOBU 73 described with reference to FIG. 2, “0” is set to a flag FL that is a variable for instructing the presence / absence of a state where data is divided into head side data 731 and end side data 732 and read into a segment. (S7). When the flag FL is “0”, it indicates that there is no divided state, and when it is “1”, it indicates that there is a divided state.

  The segment unit reading unit 35 stores data for one segment from the reading start position via the disk control unit 9 in the segment 50 of the read data buffer 33 (S9).

  Subsequently, the output unit 39 to the decoder of the VOBU determines whether or not the value of the flag FL is “1”, that is, whether only the head side data of the VOBU data is output to the decoding unit 19. (S11). As a result of the determination, if only the head side data is not in the state of being output to the decoding unit 19, that is, it is determined that FL = 0 (NO in S11), the VOBU size determination unit 37, for example, the first VOBU 71 of the segment 50 The data of the size of the VOBU 71 is acquired from the Nvpck 81 (S17).

  The output unit 39 to the VOBU decoder determines whether the VOBU 71 is in the above-described division state based on the size data acquired by the VOBU size determination unit 37 (S19). Since it is determined that the VOBU 71 is not in the divided state (NO in S19), the output unit 39 to the VOBU decoder reads the VOBU 71 from the segment 50 and outputs it to the decoding unit 19 (S21).

  Next, the control unit 3 determines whether the last data of the segment 50 has not been read, that is, whether there is unoutput data in the segment 50 (S23). If it is determined that there is data that has not been output to the decoding unit 19 (YES in S23), the process returns to step S17 and the subsequent processing is similarly performed for the next VOBU 72.

  Thereafter, the next VOBU 73 is read. First, the VOBU size determination unit 37 acquires data of the size of the VOBU 73 from the Nvpck 83 of the third VOBU 73 of the segment 50 (S17).

  The output unit 39 to the VOBU decoder determines whether the VOBU 73 is in the above-described division state based on the size data acquired by the VOBU size determination unit 37 (S19). Since it is determined that the VOBU 73 is in a divided state (YES in S19), the control unit 3 sets the flag FL to '1' (S27), and the output unit 39 to the VOBU decoder sets the head of the VOBU 73 of the segment 50. The side data 731 is read and output to the decoding unit 19 (S29). Thereafter, the process proceeds to step S9.

  In step S9, the segment unit reading unit 35 stores the next one segment of data from the DVD 7 into the segment 50 of the read data buffer 33 via the disk control unit 9 (S9).

  Subsequently, the output unit 39 to the decoder of the VOBU determines whether or not the value of the flag FL is “1”, that is, whether only the head side data of the VOBU data is output to the decoding unit 19. (S11). The determination result indicates that only the head side data 731 is output to the decoding unit 19, that is, it is determined that FL = 1 (YES in S 11), so the output unit 39 to the decoder of the VOBU The remaining terminal side data 732 of the VOBU 73 located at the head is read and output to the decoding unit 19 (S13). Thereafter, the control unit 3 sets the value of the flag FL to “0” (S15). And a process transfers to step S17 and a process is similarly performed about the following VOBU74.

  Returning to the process of step S23, if the control unit 3 determines that there is no data not yet output to the decoding unit 19 in the segment 50 (NO in S23), the control unit 3 determines whether all the data of the specified title is read from the DVD 7 or not. (S25). Based on whether or not the data stored at the address of the DVD 7 indicated by the information of the title playback end position read in step S3 is read to the data buffer 33, the control unit 3 finishes reading all the data of the designated title. It is determined whether or not. If the determination result indicates that all data has not been read (NO in S25), the process returns to step S9. If all data has been read (YES in S25), a series of read processes are performed. Ends.

  As shown in the procedure of FIGS. 2 and 3, when reading the title data from the DVD 7 for playback, it is not read in units of VOBU 7i, but the size of the segment 50 or 51 provided in the data buffer 33. Reads data in batches. Then, the information of Nvpck 8i of each VOBU 7i of the data read in the segment 50 or 51 is analyzed to obtain the data size of the VOBU 7i, and the data size corresponding to the obtained data size (data of VOBU 7i) is taken from the segment. Data is read and output to the decoding unit 19.

  Therefore, compared to reading from the DVD 7 to the data buffer 33 in units of VOBU 7i, the number of accesses to the DVD 7 is reduced, and the seek time for the DVD 7 is also reduced. In addition, the segment 50 or 51 of the data buffer 33 is dynamically allocated according to the free memory capacity of the control unit 3 that can be used during data reproduction regardless of the data size of the VOBU 7i. Excellent efficiency. In addition, since data is collectively read from the DVD 7 in the segment size unit and stored in the segment, the entire area of the segment can always be used for data reading. Excellent.

  On the other hand, when reading data from the DVD 7 in units of VOBU 7i, it is logically necessary to prepare a capacity corresponding to the maximum size assumed for the VOBU 7i in the data buffer 33. Therefore, the data buffer 33 has an area that is not used or a storage area that is used less frequently, and the memory utilization efficiency is not excellent. In addition, when data is read from the DVD 7 in units of VOBU 7i, the access to the DVD 7 is frequent and the seek time for the DVD 7 is also increased. Therefore, speeding up of data reproduction is hindered.

  In general, in a DVD playback apparatus, the processing of the CPU is faster than reading data from a DVD, so in this embodiment as well, the processing speed of the CPU of the control unit 3 is one segment of data from the Video-DVD 7 in the data buffer 33. The speed of reading to segment 50 or 51 is far exceeded. Therefore, the data is written in the segment 50, and then the VOBU size data is obtained by analyzing the Nvpck8i by the VOBU size determination unit 37 and the output unit 39 to the VOBU decoder. The process until the data (VOBU) is read from the segment and output to the decoding unit 19 can be executed sufficiently faster than reading out the data for one segment from the DVD 7 to the data buffer 33. As a result, it is possible to avoid a situation in which data written in the segment 50 or 51 is overwritten with data for one new segment read from the DVD 7 before all the data is output to the decoding unit 19. Is done.

  In order to reliably avoid the above-described data overwriting situation, the following may be performed. That is, while the segments 50 and 51 are accessed by the output unit 39 to the VOBU size determination unit 37 and the VOBU decoder, other processing, that is, the segment unit reading unit 35 does not access the segment 50. You may make it employ | adopt so-called exclusive control of prohibiting.

  In addition, since the two segments 50 and 51 are provided here, the processing may be performed in parallel for each segment. That is, in the segment 51, the VOBU size determination unit 37 and the output unit 39 to the VOBU decoder analyze the VOBU size data and output the data to the VOBU decoding unit 19 in parallel. The other segment 50 that has completed data output to 19 may store data for one segment read from the DVD 7.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a block configuration diagram of a DVD playback apparatus according to an embodiment of the present invention. It is a figure explaining the data read procedure of the segment unit based on embodiment of this invention. It is a flowchart which shows the process sequence which concerns on embodiment of this invention.

Explanation of symbols

  3 control unit, 7 DVD, 9 disk control unit, 19 decoding unit, 35 segment unit reading unit, 37 VOBU size determination unit, 39 output unit to VOBU decoder, 33 data buffer, 50, 51 segment, 7i VOBU, 8i Nvpck.

Claims (7)

A disc playback apparatus that reads out and reproduces the target information from a disc medium on which target information including one or a plurality of data units having a series of data is recorded,
A buffer having one or a plurality of predetermined storage areas of variable size;
Reading means for collectively reading data in units of size of the predetermined storage area from the target information of the disk medium and storing the data in each of the one or more predetermined storage areas of the buffer;
Output means for reading the data read by the reading means and stored in the one or more predetermined storage areas for each data unit and outputting the data to a data reproducing unit prepared in advance;
The data unit includes size information indicating a size of the data unit;
The output means includes
Size search means for searching the data read by the reading means and stored in the one or more predetermined storage areas, and reading the size information;
Read the data read by the reading means and stored in the one or more predetermined storage areas for each size indicated by the size information read by the size search means,
The data reproduction unit performs reproduction processing for each data unit,
When the data of the same data unit is divided and stored in a plurality of the predetermined storage areas by the reading means, the output means is configured to continuously output the data of the same data unit from the plurality of predetermined storage areas. Is output to the data reproduction unit,
Exclusive control of access to data stored in the one or more predetermined storage areas;
A process of reading out data for each data unit by the output means and outputting the data to the data reproduction unit; and reading out data in units of size of the predetermined storage area from the target information of the disk medium by the reading means; Processing in parallel with each one or a plurality of predetermined storage areas different from the predetermined storage area from which data is read by the output means of the buffer;
Each time the playback process is started, the one or more predetermined storage areas having a size based on the size of the empty storage area in the disk playback device are set in the buffer,
A disc playback apparatus in which the target information is recorded on the disc according to a video format, and the data unit is a video object unit. A disc playback apparatus that reads out and reproduces the target information from a disc medium on which target information including one or a plurality of data units having a series of data is recorded,
A buffer having one or a plurality of predetermined storage areas of variable size;
Reading means for collectively reading data in units of size of the predetermined storage area from the target information of the disk medium and storing the data in each of the one or more predetermined storage areas of the buffer;
Output means for reading the data read by the reading means and stored in the one or more predetermined storage areas for each data unit and outputting the data to a data reproducing unit prepared in advance ;
The data unit includes size information indicating a size of the data unit;
The output means includes
Size search means for searching the data read by the reading means and stored in the one or more predetermined storage areas, and reading the size information;
The stored are read out to the one or more predetermined memory area data by said reading means, you characterized by reading each size indication of the size information which is read by the size search unit, disk Playback device. The data reproduction unit performs reproduction processing for each data unit,
When the data of the same data unit is divided and stored in the plurality of predetermined storage areas by the reading means, the output means is continuously divided from the plurality of predetermined storage areas to the divided data of the same data unit. 3. The disk reproducing apparatus according to claim 2, wherein data is read and output to the data reproducing unit. Wherein 1 or, characterized in that a plurality of predetermined memory area in the exclusive control for the access of the stored data, the disk reproducing apparatus according to any one of claims 2 3. A process of reading out data for each data unit by the output means and outputting the data to the data reproduction unit; and reading out data in units of size of the predetermined storage area from the target information of the disk medium by the reading means; and executes in parallel the process of storing in each of the different one or a plurality of predetermined storage area from the predetermined storage area where the data is read out by the output means of the buffer, 4 of claims 2 The disc reproducing apparatus according to any one of the above. 3. The one or more predetermined storage areas having a size based on the size of an empty storage area in the disk playback apparatus are set in the buffer each time the playback process is started. 6. The disk reproducing apparatus according to any one of items 1 to 5 . Wherein the disk, wherein the target information is recorded in accordance Video format the data unit is a video object unit, the disc reproducing apparatus according to any one of claims 2 to 6.

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