JP2005339730A - Device and method for reproducing data - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce a DV data stream recorded on a disk-like recording medium without data processing. <P>SOLUTION: The data reproducing device 1 comprises an input interface 11 for acquiring the DV data, an input buffer 12 for temporarily storing the inputted DV data, a data separating part 14 for separating the DV data, a data separating part 14 for separating an actual data from an AUX data accompanying the actual data, an AUX data reproducing part 15, a stream controller 16, a buffer memory 17 as a decoding operation area, a data reproduction processing part 18, for decoding the DV data, a DAC 19 for D/A converting the decoded DV data, and an output interface 20 for outputting the decoded data, and the stream controller 16 manages the input buffer 12 referring to a management table in which a read number, a frame number in the buffer, and a flag showing a state of a storage area are mapped to an area number for identifying a storage area for storing therein the DV data for one frame, and a pointer for specifying an area number for identifying a storage area to be allocated next. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a data reproducing apparatus and a data reproducing method, and more particularly to a data reproducing apparatus and a data reproducing method for reproducing DV (Digital Video) data recorded on a disc-shaped recording medium.

  In recent years, recording media such as CD (Compact Disc), MD (Mini Disc), and DVD (Digital Versatile Disc) have been required to have a larger capacity, and various technologies have been developed to increase the capacity. Yes. Also, coupled with the rapid digitization of music content and video content, the diversification of content distribution sources due to the development of so-called Internet technology, for example, music content, video content, data for computer use, etc. are free. Therefore, it is required to be able to record and reproduce. Among these, a new disk format that uses a laser having a wavelength of around 400 nm has attracted a great deal of attention as a next-generation recording technology not only from the recording capacity but also from the aspect of the recording system.

  A Blu-ray disc format will be described as an example of a new disc format using a laser beam having a wavelength of 405 nm. In the Blu-ray Disc (hereinafter referred to as Blu-ray Disc; BD) format, the laser light wavelength is 405 nm, the lens numerical aperture is 0.85, and the content data is DVD (Digital Versatile Disc) or CD (Compact Disc). Recording is performed with a track pitch of 0.32 μm, a data bit length of 0.120 μm / bit, and a transfer rate of 36 Mbps on the same disk-shaped recording medium having a diameter of 12 cm. The storage capacity of one-layer BD on one side is 23 to 27 GB.

  Taking a BS digital broadcast signal as an example of a broadcast signal, since the BS digital broadcast signal has a transfer rate of 24 Mbps, the BD format has a recording capacity sufficient to continuously record digital data sent at this transfer rate for two hours. It is understood that is prepared. Although it was impossible with the existing recording method, the BD format has a transfer rate of 36 Mbps. Therefore, the data stream of the digital video standard (transfer rate of 28.77 Mbps in the NTSC method and transfer rate of 28.8 Mbps in the PAL method). ) Can be recorded without processing.

  This necessitates a reproduction system for reproducing a digital video standard data stream recorded on a BD that is a disc-shaped recording medium.

  As a technique for using multiplexed data based on the DV format in a disk-shaped recording medium based on an existing disk format, for example, when a DV data stream recorded on a hard disk is edited on a computer, the DV data stream is once captured by the computer A technique has been proposed in which a computer can directly access a hard disk on which DV data is recorded without performing the above (see Patent Document 1).

  Further, as a technique for transferring a multiplexed data stream based on the DVD audio format or the DV video format, there is a technique that converts the data stream into a transmission packet and sets an appropriate transfer speed and transfer method for each packet. It has been proposed (see Patent Document 2).

  However, each of these techniques is a method of processing and recording a DV data stream or a method of processing and transmitting DV data, and the technology itself for recording a DV data stream on a disk-shaped recording medium without processing. There was no.

JP 2002-171475 A JP 2001-110134 A

  An object of the present invention is to provide a data reproducing apparatus and a data reproducing method capable of reproducing a data stream of a high transfer rate digital video standard recorded on a disk-shaped recording medium without changing the transfer rate.

  In order to achieve the above-described object, a data reproducing apparatus according to the present invention includes a data acquisition unit that acquires digital video data from a disc-shaped recording medium, and the digital video data acquired by the data acquisition unit for each reading unit. Temporary storage means for storing in memory, a reading number for specifying a reading unit of digital video data, a frame number for specifying each frame when the acquired digital video data is expanded in the temporary storage means, and a digital for one frame Management table for storing a management table in which an index indicating the state of a storage area for storing video data is associated with an area number for specifying a storage area for storing one frame constituting digital video data in the temporary storage means Indicates the frame number to be referenced among the frame numbers in the storage means and the management table. Pointer information storage means for storing the pointer information, management of writing of digital video data to the temporary storage means and transmission of digital video data from the temporary storage means with reference to the pointer information, and the pointer information storage means Management control means for updating the stored pointer information, data decoding means for decoding the digital video data sent from the temporary storage means by the management control means, and outputting the digital video data decoded by the data decoding means to the outside Output means.

  The data reproducing apparatus according to the present invention includes a reading number for specifying a reading unit of digital video data, a frame number for specifying each frame when the digital video data is expanded in the temporary storage means, and digital video data for one frame. Based on a management table in which the index indicating the state of the storage area for storing the image is associated with the area number in the temporary storage means, further referring to the pointer information and writing the digital video data to the temporary storage means and the temporary storage means The transmission of digital video data from the network may be managed.

  In particular, the management control means may specify the frame of the digital video data sent from the temporary storage means to the data decoding means by the frame number.

  In the data reproducing apparatus according to the present invention, when the digital video data is read in the forward direction for each reading unit by the data acquisition means, the management control means reads out when the read digital video data is expanded in the temporary storage means. When the frame number for specifying each frame is assigned by incrementing the frame number of the first frame of the unit and the digital video data is read in the reverse direction for each reading unit by the data acquisition means, the management control means reads When the digital video data is expanded in the temporary storage means, a frame number for identifying each frame is assigned by subtracting the number from the frame number of the last frame of the reading unit.

  The index indicating the state of the storage area for storing one frame of digital video data includes an index indicating that the digital video data stored in the storage area is being transferred to the data decoding means, and the storage area is being released. An index indicating that the storage area is usable, and an index indicating that the storage area has been used once and has been used.

  The pointer information includes a write designation pointer for designating an area number for specifying a storage area in the temporary storage means to which the acquired digital video data is to be assigned next, a reserved pointer for designating the next usable area, and a read number. And a pointer indicating the first frame of the reading unit that is the smallest.

  The management table has at least a read number for specifying a read unit of digital video data and an input digital video data for an area number for specifying a storage area for storing one frame constituting digital video data in the temporary storage means Is expanded in the temporary storage means, a frame number for identifying each frame, an index indicating the state of the storage area for storing one frame of digital video data, the frame number of the first frame of the readout unit and the end of the readout unit The frame number of the tail frame, the capacity of head data included before the first frame of the reading unit and unnecessary for the digital video data, and unnecessary for the digital video data included after the last frame of the reading unit. The size of the tail data and the address of the digital video data on the disc-shaped recording medium Information and are associated with each other.

  In order to achieve the above-described object, a data reproduction method according to the present invention includes a data acquisition step for acquiring digital video data from a disc-shaped recording medium, and the digital video data acquired in the data acquisition step for each reading unit. A temporary storage step for storing in the temporary storage memory, a reading number for specifying a reading unit of the digital video data, a frame number for specifying each frame when the input digital video data is expanded in the temporary storage memory, and one frame Management table that associates an index indicating the state of the storage area for storing digital video data for each area number for specifying a storage area for storing one frame constituting digital video data in the temporary storage memory Management table storage step stored in the table memory and management table A pointer information storage step for storing pointer information indicating a frame number to be referred to in the pointer information memory, writing digital video data to the memory with reference to the pointer information, and digital from the temporary storage memory A management control step for managing transmission of video data and updating pointer information stored in the pointer information memory; a data decoding step for decoding digital video data sent from the memory by the management control step; and a data decoding step. A data output step of outputting the decoded digital video data to the outside.

  In the data reproduction method according to the present invention, a reading number for specifying a reading unit of digital video data, a frame number for specifying each frame when the digital video data is expanded in the temporary storage memory, and digital video data for one frame Is stored in the temporary storage memory with reference to the pointer information based on the management table in which the index indicating the state of the storage area for storing the data is associated with the area number in the temporary storage memory. Transmission of digital video data from the memory is managed.

  A data reproducing apparatus and a data reproducing method according to the present invention include a reading number for specifying a reading unit of digital video data, a number for specifying a frame when the digital video data is expanded in a memory, and digital video data for one frame. Limited memory by defining a management table in which an index indicating the state of the area to be stored is associated with an area number in the memory, and pointer information indicating a frame number to be preferentially referenced in the management table Can be used efficiently. As a result, a high transfer rate digital video standard data stream recorded on a disk-shaped recording medium can be reproduced with a minimum memory capacity without changing the transfer rate.

  Further, since the management table can be configured according to the maximum value of DV frames that can be recorded in a memory capacity as a commercially available temporary storage means, digital video data can be recorded from a disc-shaped recording medium using the method according to the present invention. There is no need to prepare a special memory for playback.

  A data reproducing apparatus shown as a specific example of the present invention inputs a digital video standard data (hereinafter referred to as DV data) stream from a disk-shaped recording medium without changing the transfer rate, and reproduces it, or a display apparatus. A device having a DV data reproduction function for outputting as a reproduction signal to other devices. This data reproducing apparatus is characterized in that the data recorded on the disk-shaped recording medium is read in a unit of data and is expanded in a temporary storage memory in the apparatus.

  As a disc-shaped recording medium, a Blu-ray disc (hereinafter referred to as BD) 30 based on the Blu-ray disc format is used as an example of a new disc format using a laser beam having a wavelength of 405 nm.

  Hereinafter, a data reproducing apparatus shown as a specific example of the present invention will be described in detail with reference to the drawings. The data reproduction apparatus 1 shown in FIG. 1 has an input interface 11 as DV data acquisition means, an input buffer 12 as temporary storage means for input of DV data reproduced from the BD 30, and data for separating input DV data. Separation unit 14, data separation unit 14 that separates actual data and auxiliary data accompanying the actual data (hereinafter referred to as AUX data), AUX data reproduction unit 15 that reproduces AUX data, and input DV A stream controller 16 for controlling the data stream, a buffer memory 17 as a decoding work area of the stream controller 16, a data reproduction processing unit 18 having a function of decoding DV data, and digital / analog of the decoded DV data Convert DAC (Digital to Analog Converter) 19 and data And an output interface 20 for outputting the decoded data in the processing unit to the outside.

  The data reproducing apparatus 1 also includes a management table memory 21 for managing DV data temporarily input to the input buffer 12 and a pointer information memory 22 in which pointer information for referring to the management table memory 21 is stored. And. Each of these components is comprehensively controlled by the system controller 23. The configuration in which the numbers are separately shown as “a” and “b” in the above figure indicates that “a” is a component for video data and “b” is a component for audio data.

  The input interface 11 inputs a data stream of DV data sent from a disk-shaped storage device capable of recording DV data as an input destination of DV data. In this specific example, the data input destination is the BD 30 reproduced by the BD reproduction unit 31.

  The input buffer 12 is controlled by the stream controller 16, reads DV data input from the input interface 11 in a predetermined unit, and temporarily stores it. In the management table memory 21, a reading number indicating a reading unit, a frame number in a buffer of a frame read from the BD 30, and a flag indicating the state of the storage area for storing one frame specify a storage area for one frame. Is associated with an area number for The stream controller 15 efficiently uses the input buffer 12 by creating this management table. The management table will be described in detail later.

  The data separator 13 separates the input DV data into video data and audio data. Of the DV data separated by the data separation unit 13, video data is supplied to the data separation unit 14a, and audio data is supplied to the data separation unit 14b. AUX data and parity are added to video data and audio data.

  The data separation unit 14 performs error correction processing using this parity to separate the actual data from the AUX data. The data separator 14a separates the actual data and the VAUX data (Video Auxiliary), which is spare data of the video data, from the supplied video data. In the VAUX data, information such as a channel number, monochrome / color, source code, channel category, recording time, and recording date can be described.

  The actual video data is supplied to the stream controller 16 and the data reproduction processing unit 18a. The separated VAUX data is supplied to the AUX data reproducing unit 15a. In the AUX data reproduction unit 15a, VAUX data that is preliminary data of video data is reproduced. The reproduced VAUX data is sent to the stream controller 16 and used as control data for data decoding or the like.

  The data reproduction processing unit 18a performs two-dimensional Huffman code decoding, inverse quantization, and inverse DCT on the reproduction data, and performs decompression processing of the compressed data. The data reproduction processing unit 18a performs deblocking processing and deshuffling processing. The data reproduction processing unit 18a outputs digital component video data composed of a luminance signal Y and color difference signals RY and BY. This digital component video data is supplied to the DAC 19a.

  The DAC 19a converts the digital component video data into analog component video data. The converted analog component video data obtained is output from the output interface 20a. In the case of outputting a composite signal, the luminance signal Y and the color difference signals RY and BY are combined, and a synchronization signal is added and output. The DV data output from the output interface 20a is sent to the monitor and the video is presented to the user.

  On the other hand, the audio data from the data separator 13 is supplied to the data separator 14b. Preliminary data and parity are added to the audio data supplied to the data separator 14b. The data separation unit 14b performs error correction processing using this parity, and separates the actual audio data and AAUX data (Audio Auxiliary) which is spare data of the audio data. In the AAUX data, information such as 2/4 channels, sampling frequency, presence / absence of emphasis, recording time, recording date, etc. can be described.

  The audio data is supplied to the data reproduction processing unit 18b. The separated AAUX data is supplied to the AUX data reproducing unit 15b. AAUX data is reproduced by the AUX data reproducing unit 15b. The AAUX data is supplied to the stream controller 16 and the data reproduction processing unit 18b.

  The data reproduction processing unit 18b performs audio data reproduction processing. In this audio data reproduction process, AAUX data reproduced by the AUX data reproduction unit 15b is used as control data. Digital audio data is output from the data reproduction processing unit 18b. This digital audio data is supplied to the DAC 19b. The DAC 19b converts digital audio data into analog audio data, and the converted analog audio data is output from the output interface 20b.

  The system controller 23 controls the stream controller 16 in order to reproduce the input DV data, and overall controls each component of the data reproducing apparatus 1.

  Next, a DV data development method and management table by the stream controller 16 will be described with reference to FIG.

  The DV data stream stored in the storage device BD 30 is transferred to the input buffer 12 of the stream controller 16 in response to a request from the system controller 23. One section of the DV data stream requested to be transferred at a time from the system controller 23 is divided. Hereinafter, in the data reproducing apparatus 1, the capacity securing and releasing of the input buffer 12 are all performed in section units. At this time, when the data length that can be transferred at one time is defined according to the transfer condition of the storage device, extra data not related to the contents may be added to the head and tail of the section. Here, these data are referred to as head data and tail data. The amount of transfer data is adjusted by adding head data and tail data.

  In order to manage the stream transferred to the input buffer 12, the stream controller 16 assigns a number proportional to time to the input DV frame. Controlled by the input buffer 12 waves and the stream controller 16, the DV data input through the input interface 11 is stored for each reading unit. In the management table memory 21, the readout number, the frame number in the buffer, and the flag indicating the storage area state are associated with the area number for specifying the storage area in which DV data for one frame is stored. It has been. The number assigned to each reading unit is a number that specifies the reading unit, and one reading unit (hereinafter referred to as a section) is composed of, for example, 5 frames of DV data. For this section, head data is included before the first frame, and tail data is included after the last frame.

  When reading from the BD 30, it is difficult to read DV data accurately from the beginning of the frame, so that data not related to the contents is read before the first frame and after the last frame. This data is referred to as head data and tail data. In this specific example, the capacity of the read unit of one section is aligned to 32 bytes. The in-buffer frame number is a frame number for specifying each frame in the buffer when the input DV data is expanded in the input buffer 12.

  The flag indicating the state of the storage area includes a flag indicating whether a storage area for storing DV data for one frame is used in the input buffer 12, and DV data stored in the storage area as a decoder. The flag indicating that the data is being transferred to the data reproduction processing unit 18, the flag indicating that the storage area is released, the flag indicating that the storage area is usable, and the use is finished once There is a flag to indicate that. In the data reproducing apparatus 1, a flag indicating that data is being transferred is provided so that the used memory area is not released immediately. If the memory area is released immediately after use, defragmentation of the input buffer 12 is required later. However, in the data reproducing apparatus 1, since the area of the input buffer 12 is handled for each determined section unit, defragmentation becomes unnecessary. .

  The pointer information memory stores pointer information indicating a frame number to be referred to preferentially among the frame numbers in the management table memory.

  A DV data expansion method and management table by the stream controller 16 will be described. First, as an example of a method in which the stream controller 16 reads DV data from the BD 30 into the input buffer 12, a case where DV data is read in the forward direction for each section as a reading unit by the input interface 11 will be described with reference to FIGS. explain.

  In the upper part of FIG. 2, the DV data stream recorded on the BD 30 is shown so that the frame breaks can be recognized. In the lower part, DV data stored in the input buffer 12 is shown. The DV data stream recorded on the BD 30 is configured in units of frames such as a frame A, a frame B,..., A frame E,. Read as one section. As shown in the figure, section 0 is composed of frame A, frame B,..., Frame E, and section 1 is composed of frame F, frame G,. Each section includes head data and tail data at the time of reading.

  The stream controller 16 creates a management table and stores it in the management table memory 21 when developing each frame in the input buffer 12. The management table shown in FIG. 3 includes a buffer ID (buf_id in FIG. 3) for specifying a storage area in the input buffer 12 and a number in the buffer for specifying a frame developed in the input buffer 12 (hereinafter referred to as a buffer). (Referred to as an inner frame number) (que_no in FIG. 3), a section number (sec_no in FIG. 3) for specifying a section which is a DV data read unit, and a storage area for storing DV data for one frame in the buffer There is a flag (stat_flg in FIG. 3) indicating the state of the above, and these are associated with the buffer ID.

  The flag indicating the state of the storage area uses a storage area for storing one frame of DV data in the input buffer 12 and transfers the DV data stored in the storage area to the data reproduction processing unit 18 as a decoder. A flag indicating that the storage area is in use (alloc), a flag indicating that the storage area has been released (blank), a flag indicating that the storage area is available (reserve), and once the use is finished There is a flag (free) indicating that this is the case.

  In addition to the above, the management table includes the address information (address) of the DV data on the BD 30, the head data capacity (head) included before the first frame of the section and unnecessary for the DV data, and the last frame of the section. Buffers include tail data capacity (tail) unnecessary for DV data, frame number of the first frame of the section (top_que), frame number of the last frame of the section (end_que), and information (type) indicating the broadcasting system. It is associated with the ID.

  The address information (address) of the DV data on the BD 30 is defined as 120,000 bytes per frame in the digital video standard. Therefore, in the DV data stream continuously recorded on the BD 30, the address information of the frame A +120,000. Further, in the example of FIGS. 2 and 3, the capacities X and Y are described in the frame A (buf_id_0) and the frame E (buf_id_4) in the head data capacity (head) and the tail data capacity (tail). . For example, in the case of section 1, the frame number (top_que) of the first frame of the section and the frame number (end_que) of the last frame of the section are que_no_5 where top_que is the frame number in the buffer, and end_que is que_no_9. The information (type) indicating the broadcast system is information indicating the NTSC system or the PAL system, and NTSC is described here.

  The stream controller 16 assigns the frame number in the input buffer 12 of the frame following the frame A by incrementing the number from the buffer ID of the first frame A included in the section 1, and assigns the frame data for one section to a continuous area in the buffer. Write. Specifically, in section 0, when allocating frame A to buffer ID buf_id_0, frame B is allocated to buf_id_1 and frame E is allocated to the storage area of buf_id_4 so that subsequent frames are stored in the continuous area.

  In addition, pointer information is prepared in order to efficiently search for data stored in the input buffer 12. In the data reproducing apparatus 1, the stream controller 16 refers to the management table described above by pointer information. In the pointer information, a write designation pointer (write_ptr) that designates an area number for specifying the first frame of the storage area in the input buffer 12 to which the acquired DV data is to be assigned next, that is, a buffer ID, can be used next. There is a reserve pointer (reserve_ptr) that designates the first frame of the storage area, and a pointer (section_ptr) that indicates the first frame of the section having the smallest section number in the input buffer 12. The pointer information is stored in the pointer information memory 22.

  The DV frame stored in the input buffer 12 indicates that it is a frame that can be assigned next by designating a write designation pointer in order from the buffer ID corresponding to the completed DV frame when reproduced. When the stored DV data is being transferred (locked), the write designation pointer is updated, and the transferred buffer ID is designated by this pointer. When the storage area becomes usable, that is, when the flag becomes Reserve, the reserve pointer is updated, and the buffer ID is designated by the reserve pointer. However, the storage area is released after the area for one section is all free. As a result, the data reproducing apparatus 1 can use the input buffer 12 efficiently.

  When the stream controller 16 reads DV data from the BD 30 into the input buffer 12, the stream controller 16 may read in the reverse direction for each section.

  An example of this method is shown in FIGS. When DV data is read in the reverse forward direction for each section by the input interface 11, when the read DV data is expanded in the input buffer 12, the stream controller 16 decrements the number from the frame number of the last frame of the section. Then, a frame number (que_no) for specifying the frame in the input buffer 12 is assigned.

  In the upper part of FIG. 4, the DV data stream recorded on the BD 30 is shown so that the frame breaks can be recognized. In the lower part, DV data stored in the input buffer 12 is shown. The DV data stream recorded on the BD 30 is a stream ending with a frame Z following a frame Q, a frame R,. The BD playback unit 31 reads out five frames as one section. As shown in the figure, section 0 is composed of frame V, frame W,..., Frame Z that are continuous in the positive direction of the stream, and section 1 is composed of frame Q, frame R,. Is done. That is, frames that are continuous in the forward direction within the section are read out in the reverse forward direction for each section.

  The stream controller 16 creates the management table shown in FIG. 5 and stores it in the management table memory 21 when the DV data stream is developed in the input buffer 12 in the reverse forward direction. Even when reading in the reverse forward direction, the items prepared in the management table are the same as those in the forward direction management table shown in FIG. The stream controller 16 assigns the frame number in the input buffer 12 by decrementing the number from the buffer ID of the last frame Z included in the section 0 to the DV data stream ending in the frame Z and assigning it to one section. Write frame data to a continuous area in the buffer. Specifically, in section 0, when allocating frame Z to buffer ID buf_id_0, frame Y is decremented from buf_id_0, buf_id_-1 is allocated, buf_id_-2 is allocated to frame X, and frame V is allocated. In this case, buf_id_-4 is assigned, and frames following the frame V in the forward direction are stored in the continuous area.

  As described with reference to the two specific examples, in the data reproducing apparatus 1, the section number that identifies the section that is the DV data read unit and the frame in the buffer that identifies the frame in the buffer when the DV data is expanded in the memory. A management table in which a frame number and a flag as an index indicating the state of an area storing DV data for one frame are associated with a buffer ID in the input buffer 12, and a frame to be preferentially referenced in the management table By defining the pointer information indicating the number, a limited memory can be used efficiently. As a result, DV data with a high transfer rate recorded without processing on the BD 30 that is a disk-shaped recording medium can be reproduced with the minimum memory capacity without changing the transfer rate. Further, by referring to the pointer information, even if the management table size is increased, a faster search can be performed. Since the management table can be configured according to the maximum value of the DV frame that can be recorded in the capacity of a commercially available memory, it is necessary to prepare a special memory for reproducing DV data from the BD 30 using this method. Absent.

  In addition, by preparing the management table described above, a vendor who designs software for the data reproducing apparatus 1 can perform DV stream reproduction without considering the detailed data of each DV frame recorded in the buffer. .

  For example, among the information described in the management table, only the frame number in the buffer needs to be disclosed to the vendor (hereinafter referred to as a host user) who develops software for the data reproducing apparatus 1. Become. For example, when the data reproduction apparatus 1 performs special reproduction of DV data, the frame number in the buffer is designated and the data obtained by searching the input buffer from the management table is sent to the data reproduction processing unit 18 which is a DV codec.

  The processing for creating the management table described above can also be executed by software processing of the BD playback system. In this way, the BD playback system can grasp the state in the input buffer 12 based on the created management table. The host user who creates the software for the playback system uses a program for designating the buffer ID of the management table in which the frame to be played is stored according to the type of playback mode including special playback such as fast forward and rewind. Create it. For example, in the case of executing fast-forward playback at 5 × speed, a program in which the buffer frame number (que_no) is designated as 0, 5, 10,. Although the number of frames in the section is 5 frames, the number of frames is not limited to this number. Therefore, if the speed is 3 ×, a program can be made such that one section is composed of 3 frames and the top frame is continuously reproduced. Also, for example, when 5 × speed playback is used, the first frame (frame 0) and the fifth frame (frame 5) can be played back as 10 frames and 1 section.

  Further, even in the case of triple speed, a program that reproduces the first frame (frame 0), frame 3, frame 6, and frame 9 as 10 frames and 1 section can be used. Also in this case, the buffer area in which the reproduction frame is stored can be easily realized by creating a program for designating the frame number in the buffer. Thus, according to the data reproducing apparatus 1, there is also an advantage that software design becomes easy.

  The present invention has been described with respect to a case where the present invention is applied to a device having a DV data reproduction function of inputting DV data and reproducing it or outputting it as a reproduction signal to other devices such as a display device. The present invention can also be applied to devices having functions.

It is a block diagram explaining the data reproduction apparatus shown as a specific example of this invention. It is a schematic diagram explaining a mode that DV data is read for every section from BD, and is expand | deployed to an input buffer. It is a figure explaining the management table when DV data is read for every section from BD in the forward direction, and is expand | deployed to the input buffer. It is a schematic diagram explaining a mode that DV data is read from BD for every section in the reverse direction, and is expand | deployed by the input buffer. It is a figure explaining the management table when DV data is read from BD for every section in the reverse direction, and is expand | deployed by the input buffer.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Data reproduction apparatus, 11 Input interface, 12 Input buffer, 13 Data separation part, 14 Data separation part, 15 AUX data reproduction part, 16 Stream controller, 17 Buffer memory, 18 Data reproduction processing part, 19 DAC, 20 Output interface, 21 management table memory, 22 pointer information memory, 23 system controller, 30 Blu-ray disc (BD), 31 BD playback unit

Claims (18)

In a data reproducing apparatus for reproducing digital video data recorded on a disk-shaped recording medium,
Data acquisition means for acquiring digital video data from the disc-shaped recording medium;
Temporary storage means for temporarily storing the digital video data acquired by the data acquisition means for each reading unit;
A storage for storing a reading number for specifying the reading unit of the digital video data, a frame number for specifying each frame when the acquired digital video data is expanded in the temporary storage means, and the digital video data for one frame. A management table storage means for storing a management table in which an index representing the state of the area is associated with an area number for specifying a storage area for storing one frame constituting the digital video data in the temporary storage means;
Pointer information storage means for storing pointer information indicating a frame number to be referred to among the frame numbers in the management table;
With reference to the pointer information, the writing of the digital video data to the temporary storage means and the transmission of the digital video data from the temporary storage means are managed, and the pointer information stored in the pointer information storage means is updated. Management control means;
Data decoding means for decoding the digital video data sent from the temporary storage means by the management control means;
A data reproducing apparatus comprising: output means for outputting the digital video data decoded by the data decoding means to the outside.   In the case where the digital video data is read in the forward direction for each reading unit by the data acquisition means, the management control means has the first frame of the reading unit when the read digital video data is expanded in the temporary storage means. 2. A data reproducing apparatus according to claim 1, wherein a frame number for identifying each frame is assigned by incrementing the number of the frame number.   When the digital video data is read in the reverse forward direction for each reading unit by the data acquisition unit, the management control unit has the last unit of the reading unit when the read digital video data is expanded in the temporary storage unit. 2. The data reproducing apparatus according to claim 1, wherein a frame number for identifying each frame is assigned by subtracting the number from the frame number of the frame.   The index indicating the state of the storage area for storing one frame of the digital video data includes an index indicating that the digital video data stored in the storage area is being transferred to the data decoding means, and the storage area 2. The data according to claim 1, further comprising: an index indicating that the storage area is being released; an index indicating that the storage area is usable; and an index indicating that the storage area has been used and has been used. Playback device.   2. The data according to claim 1, wherein the pointer information includes a write designation pointer for designating an area number for specifying a storage area in the temporary storage means to which the acquired digital video data is to be assigned next. Playback device.   2. The data reproducing apparatus according to claim 1, wherein the pointer information includes a reservation pointer for designating a next usable area.   2. The data reproducing apparatus according to claim 1, wherein the pointer information includes a pointer indicating the first frame of the reading unit having the smallest reading number. The management table has at least an area number for specifying a storage area for storing one frame constituting the digital video data in the temporary storage means,
A reading number for specifying a reading unit of the digital video data;
A frame number for identifying each frame when the input digital video data is expanded in the temporary storage means;
An index representing the state of the storage area for storing the digital video data for one frame;
The frame number of the first frame of the reading unit and the frame number of the last frame of the reading unit;
A capacity of head data included before the first frame of the reading unit and unnecessary for the digital video data;
A capacity of tail data included after the last frame of the reading unit and unnecessary for the digital video data;
2. A data reproducing apparatus according to claim 1, wherein said digital video data is associated with address information on a disc-shaped recording medium.   2. A data reproducing apparatus according to claim 1, wherein said management control means designates a frame of digital video data transmitted from said temporary storage means to said data decoding means by said frame number. In a data reproduction method for reproducing digital video data recorded on a disk-shaped recording medium,
A data acquisition step of acquiring digital video data from the disc-shaped recording medium;
A temporary storage step of storing the digital video data acquired in the data acquisition step in a temporary storage memory for each reading unit;
A reading number for specifying a reading unit of the digital video data, a frame number for specifying each frame when the input digital video data is expanded in the temporary storage memory, and the digital video data for one frame are stored. A management table in which a management table in which the index indicating the state of the storage area is associated with the area number for specifying the storage area for storing one frame constituting the digital video data in the temporary storage memory is stored in the management table memory A table storage step;
A pointer information storage step for storing pointer information indicating a frame number to be referred to among the frame numbers in the management table in a pointer information memory;
Management control step for managing writing of the digital video data to the memory and sending of the digital video data from the temporary storage memory with reference to the pointer information and updating the pointer information stored in the pointer information memory When,
A data decoding step for decoding the digital video data sent from the memory by the management control step;
And a data output step of outputting the digital video data decoded in the data decoding step to the outside.   When the digital video data is read in the forward direction for each reading unit by the data acquisition step, the management control step is configured such that the first frame of the reading unit is expanded when the read digital video data is expanded in the temporary storage memory. 11. The data reproducing method according to claim 10, wherein a frame number for identifying each frame is assigned by incrementing the number of the frame number.   When the digital video data is read out in the reverse forward direction for each reading unit by the data acquisition step, the management control step is configured such that when the read digital video data is expanded in the temporary storage memory, the end of the reading unit is read out. 11. The data reproduction method according to claim 10, wherein a frame number for identifying each frame is assigned by subtracting the number from the frame number of the frame.   The index indicating the state of the storage area for storing one frame of the digital video data includes an index indicating that the digital video data stored in the storage area is being used in the data decoding step, and the storage area 11. The data according to claim 10, further comprising: an index indicating that the storage area is being released; an index indicating that the storage area is usable; and an index indicating that the storage area has been used and has been used. Playback method.   11. The data according to claim 10, wherein the pointer information includes a write designation pointer for designating an area number for specifying a storage area in the temporary storage memory to which the acquired digital video data is to be assigned next. Playback method.   11. The data reproducing method according to claim 10, wherein the pointer information includes a reservation pointer for designating a next usable area.   11. The data reproducing method according to claim 10, wherein the pointer information includes a pointer indicating the first frame of the reading unit having the smallest reading number. The management table has at least an area number for specifying a storage area for storing one frame constituting the digital video data in the temporary storage memory.
A reading number for specifying a reading unit of the digital video data;
A frame number for identifying each frame when the input digital video data is expanded in the temporary storage memory; and
An index representing the state of the storage area for storing the digital video data for one frame;
The frame number of the first frame of the reading unit and the frame number of the last frame of the reading unit;
A capacity of head data included before the first frame of the reading unit and unnecessary for the digital video data;
A capacity of tail data included after the last frame of the reading unit and unnecessary for the digital video data;
11. The data reproducing method according to claim 10, wherein the address information on the disc-shaped recording medium of the digital video data is associated.   11. The data reproduction method according to claim 10, wherein in the management control step, a transmission order of digital video data used in the data decoding step is designated from the temporary storage memory based on the frame number.

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