JP2008294883A - Data recording apparatus, data reproduction apparatus, data recording and reproduction system and data reproduction program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data recording apparatus in which data can be reproduced even while the data are recorded without requiring a large capacity recording medium. <P>SOLUTION: There are provided: a moving image data receiving means for receiving a stream containing compression-coded moving image data; a recording target data extracting means for extracting desired recording target data from the received stream; a first recording medium for recording the recording target data extracted by the recording target data extracting means; a dividing point determining means for determining a dividing point of the recording target data extracted by the recording target data extracting means; and a data recording means in which the recording target data are divided on the basis of the dividing point determined by the dividing point determining means, and resultant divided units are sequentially recorded in the first recording medium as different files. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a data recording device, a data reproducing device, a data recording / reproducing system, and a data reproducing program.

Mobile terminals that receive terrestrial digital broadcasts for portable terminals are often provided with a function of recording video / audio data of received terrestrial digital broadcast programs on a recording medium such as an SD memory card. Since moving image data is handled, a large-capacity recording medium is required. Also, it could not be played back unless the recording was finished. On the other hand, PCs and the like have large capacity recording media such as HDDs, but few have a function of receiving terrestrial digital broadcasts for portable terminals.
JP 2005-189982 A JP 2006-93986 A

  The present invention provides a data recording device, a data reproducing device, a data recording / reproducing system, and a data reproducing program capable of reproducing data even during data recording without requiring a large capacity recording medium. With the goal.

  According to the first aspect of the present invention, there is provided moving image data receiving means for receiving a stream including compressed and encoded moving image data, recording target data extracting means for extracting desired recording target data from the received stream, and recording target data The first recording medium for recording the recording target data extracted by the extracting means, the dividing point determining means for determining the dividing point of the recording target data extracted by the recording target data extracting means, and the dividing point determining means Data recording means for dividing the recording target data based on the divided points and recording the obtained division units as different files on a first recording medium is provided.

  According to a second aspect of the present invention, in the data recording apparatus according to the first aspect, the number of files for storing the division unit is set to a predetermined number, and the data recording means is provided for storing the division unit. It is characterized by cyclically switching files within a predetermined number.

  According to a third aspect of the present invention, in the data recording apparatus according to the first aspect, the division point determining means includes a division unit having a reproduction time of a predetermined time length and all of the division units included in the reproduction time. The division point is determined so that the video frame can be decoded.

  According to a fourth aspect of the present invention, in the data recording apparatus according to the first aspect, the moving image data is H.264. 264 / AVC, and the division point determination means determines the division point so that the division unit has a reproduction time of a predetermined time length and includes at least one IDRAU. And

  According to a fifth aspect of the present invention, in the data recording apparatus according to the first aspect, the file is a file conforming to the SD-Video standard.

  According to a sixth aspect of the present invention, there is provided a data reproducing apparatus for reproducing data recorded on a first recording medium by the data recording apparatus according to any one of the first to fifth aspects, wherein the second recording medium and the first recording medium are used. Specifies the division unit to be reproduced next from among the division units transferred to the second recording medium and the movement processing means for sequentially moving the divided units recorded in the second recording medium to the second recording medium. A reproduction processing means for reproducing the divided unit is provided.

  The invention according to claim 7 is the data reproducing apparatus according to claim 6, wherein the degree to which the data to be reproduced is moved to the second recording medium is calculated, and according to the calculation result, A reproduction control processing means for controlling the reproduction processing means is provided.

  The invention described in claim 8 includes a data recording device and a data reproducing device, and the data recording device receives moving image data receiving means for receiving a stream including moving image data that has been compression-encoded, Recording target data extracting means for extracting desired recording target data, a first recording medium for recording the recording target data extracted by the recording target data extracting means, and the recording target data extracted by the recording target data extracting means Dividing point determining means for determining dividing points, and data to be recorded are divided based on the dividing points determined by the dividing point determining means, and the obtained division units are recorded on the first recording medium as different files. The data reproducing device includes a second recording medium, a division unit recorded on the first recording medium, Next, movement processing means for moving to the second recording medium, and reproduction processing for identifying the division unit to be reproduced next from among the division units moved to the second recording medium and reproducing the identified division unit Means are provided.

  A ninth aspect of the present invention is a data reproduction program for reproducing data recorded on a first recording medium by the data recording apparatus according to any one of the first to fifth aspects, wherein the computer records the first recording medium. A moving processing means for sequentially moving the divided units recorded on the medium to the second recording medium, and specifying a divided unit to be reproduced next from among the divided units moved to the second recording medium; It is characterized by functioning as a reproduction processing means for reproducing the specified division unit.

  According to a tenth aspect of the present invention, in the data reproduction program according to the ninth aspect, a plurality of divided units moved to the second recording medium by the movement processing means are divided into one moving image in order from the oldest recording start date and time. A program for causing a computer to function as a means for collectively arranging image data and rearranging the image data on a second recording medium is included.

  According to the eleventh aspect of the present invention, in the data reproduction program according to the ninth aspect, when the data is reproduced, a plurality of division units to be reproduced are set in order from the division unit in which reproduction is completed. A program for causing a computer to function as a means for collectively moving image data and rearranging it on a second recording medium is included.

  According to the present invention, data can be reproduced even during data recording without requiring a large-capacity recording medium.

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

[1] Configuration of data recording / reproducing system

  FIG. 1 shows the configuration of a data recording / reproducing system.

  The data recording / reproducing system includes a mobile phone 1 as a data recording apparatus and a PC 2 as a reproducing apparatus.

  The mobile phone 1 has a function of receiving and recording terrestrial digital broadcasts for mobile terminals. In this example, the portable telephone 1 is equipped with an SD memory card (first recording medium) 17 as a recording medium for recording terrestrial digital broadcasting.

  The portable phone 1 and the PC 2 are connected by a USB cable 3. The PC 2 has a playback function for performing playback while moving the data recorded on the SD memory card 17 to the PC 2 when the mobile phone 1 receives the digital terrestrial broadcast and records it on the SD memory card 17. ing.

  When all the data recorded by the mobile phone 1 is stored in one file and then moved to the PC 2, the data is moved to the PC 2 only after all the data to be recorded is recorded. I can't. Therefore, in this embodiment, by generating a file every short time on the mobile phone 1 side, data can be moved to the PC 2 side for each small unit.

[2] SD memory card file / directory structure

  According to Japanese Patent Laying-Open No. 2005-189982, the file / directory structure of the SD memory card is as shown in FIG.

  An SD-VIDEO directory is arranged immediately below the root directory (ROOT). An MGR_INFO directory and a PRGi directory are arranged under the SD-VIDEO directory (where i = 001, 002,...) (Hereinafter referred to as a PRG directory). One PRG directory corresponds to one program.

  Under the MGR_INFO directory, an MGR_DATA file and PRG_MGR are arranged. The MGR_DATA file describes version information of rules (standards) to which the moving image content stored under the SD-VIDEO directory corresponds. The PRG_MGR file describes management information for all PRG directories under the SD-VIDEO directory. Therefore, if the configuration and contents of the PRG directory are updated, the PRG_MGR file must also be updated.

  Under the PRGi directory, PRGi. PGI files (hereinafter referred to as PGI files), MOVj. MOD file (generally, j = 001, 002,...) (Hereinafter referred to as MOD file), and its management information file, MOVj. MOI files (generally j = 001, 002,...) (Hereinafter referred to as MOI files) are arranged. Information such as recording start date / time information and reproduction time information is recorded in the PGI file and the MOI file. In this embodiment, MOVj. MOD file and MOVj. In the MOI file, j takes only the value “001”. That is, one MOD file and one MOI file are arranged under one PRGi directory.

[3] Configuration of mobile phone 1

  FIG. 3 shows a configuration of a part that receives and records digital broadcasts in the mobile phone 1.

  The moving image data receiving unit (moving image data receiving unit) 11 includes a tuner and a demodulating unit. The recording target packet extracting unit (recording target data extracting means) 12 extracts a desired program as a recording target when a plurality of programs are multiplexed in the TS stream in response to an instruction from the user. Even within a desired program, only the desired program component is extracted as a recording target from program components such as video, audio, and multimedia content (data broadcast).

  The recording format conversion unit 13 converts the extracted TS stream into a predetermined recording format. The file / directory control unit 14 creates the name of the file to be created on the SD memory card 17, the name of the directory, and the hierarchical structure according to the above-mentioned predetermined rule. The management information construction unit 15 creates management information data such as recording start date / time information and reproduction time information. The division instructing unit (division point determining means) 16 determines the division point of the data to be recorded and instructs the file / directory control unit 14 to switch the PRG directory at the division point (save it in a different PRG directory). I do. The file / directory control unit 14 and the recording format conversion unit 13 divide the recording target data based on the division points determined by the division instruction unit 16 and data for storing the obtained division units in different files. A recording means is formed.

  By the way, in terrestrial digital broadcasting for portable terminals, a program (video, audio, data broadcasting) is transmitted in the format of a transport stream (TS) defined by the MPEG2 system (ISO / IEC 13818-1). Since video and audio need to be played back in synchronization with time, as shown in FIG. 4, they are packetized PES (Packetized Elementary Stream). Furthermore, it is divided into TS packets having a fixed length and multiplexed into one TS. As shown in FIG. 5, it is also possible to multiplex a plurality of services on one TS.

  The TS packet is composed of a 4-byte TS header part and a payload field part. However, as shown in FIG. 4, when information other than actual data such as stuffing is transmitted, an adaptation field portion is arranged. The TS header portion has a PID for identifying which program component is a packet to be transmitted. The receiver can extract program components from one TS stream by referring to the PID in the TS header part. Further, the TS header part has payload_unit_start_indicator, and becomes 1 when the first byte of the PES packet is arranged at the head of the payload field part of the TS packet. The receiver can detect the TS packet that transmits the first byte of the PES packet that transmits the program component by referring to the PID and the payload_unit_start_indicator.

  A PES packet that transmits video data is called a video PES, and a PES packet that transmits audio data is called an audio PES. The PES packet is composed of a PES header part and a PES payload part. In the PES header portion, information such as PTS (Presentation Time Stamp) is described.

  In terrestrial digital broadcasting for mobile terminals, “H.264 / AVC” is adopted as a video compression encoding method. An access unit when decoding a bit stream of “H.264 / AVC” is called an access unit (AU). As shown in FIG. 6, AU is classified into IDR (Instantaneous Decoder Refresh) AU and non-IDRAU. The IDRAU is an AU that is guaranteed to be playable from the AU. In the terrestrial digital broadcasting for portable terminals, it is stipulated that the IDRAU transmission cycle should not exceed 5 seconds. Normally, IDRAU is inserted at intervals of 2 seconds.

  In the case of a video PES, a plurality of access units are arranged in the PES payload portion as shown in FIG. 6, and the head of the access unit is always placed at the head of the PES payload portion. Furthermore, the IDR access unit is always placed at the head of the PES packet. At the head of the access unit, an AU delimiter (Access Unit Delimiter: information indicating the head of the access unit) is arranged. The AU delimiter stores information indicating whether this AU is an IDRAU or a non-IDRAU, and the receiver refers to the AU delimiter to determine whether the AU is an IDRAU or a non-IDRAU. Can be recognized. That is, it is possible to determine whether or not IDRAU is included in the PES payload portion by referring to about 10 bytes from the top of the PES payload portion. PTS indicates the decoding reproduction output time of the access unit arranged at the head of the PES payload.

[3-1] Operation of the division instruction unit 16

  The division instruction unit 16 performs a recording start point and division point determination process. A basic operation of the division instruction unit 16 will be described.

  As shown in FIG. 7, the processing target for determining the recording start point and the division point is the TS packet that transmits the video ES among the TS packets in the TS stream to be recorded. When the start of recording is instructed, the division instruction unit 16 detects “TS packet that transmits the first byte of the PES packet including IDRAU” among the TS packets that transmit the video ES. When a TS packet that transmits the first byte of a PES packet including IDRAU is found in the TS packet that transmits the video ES, the last byte of the AU immediately before the IDRAU is determined from the TS packet that transmits the video ES. The recording start point or division point is determined at an arbitrary position between the TS packet to be transmitted.

  FIG. 8 shows a procedure for determining the recording start point and the division point by the division instruction unit 16.

  When the start of recording is instructed by the user, S_POS, E_POS, i, k are set to 0 (step S1). Next, the i-th TS packet from the recording target packet extraction unit 12 is input (step S2). It is determined whether or not the PID of the TS packet is the PID of the video packet to be processed (step S3). If the PID is not the PID of the video packet to be processed, i is incremented by 1 (step S4), and the process returns to step S2.

  If it is determined in step S3 that the PID is the PID of the video packet to be processed, it is determined whether or not the TS packet is a TS packet that transmits the first byte of the PES packet including the IDRAU. (Step S5). If the TS packet is not a TS packet that transmits the first byte of the PES packet including IDRAU, i is set to E_POS (step S6), i is incremented by 1 (step S4), and then to step S2. Return.

  If it is determined in step S5 that the TS packet is a TS packet that transmits the first byte of the PES packet including IDRAU, after setting i to S_POS (step S7), the PES packet that transmits the IDRAU Are extracted, and the extracted PTS is set as PTS (k) (step S8). Then, it is determined whether the IDRAU is the first IDRAU detected after the recording start command is input (step S9).

  If the IDRAU is the first IDRAU detected after the recording start instruction, the recording start point is determined (step S10). Processing for determining the recording start point will be described. As shown in FIG. 9, S_POS indicates the i-th TS packet that transmits the first byte of the PES packet including the IDRAU for which the recording start point is determined. E_POS indicates a TS packet that transmits the last byte of the AU immediately before the IDRAU that is the target of determining the recording start point. The recording start point is arbitrarily set between the TS packet indicated by E_POS and the TS packet indicated by S_POS. However, it is set at the break of TS packets.

  When the recording start point is determined, k is incremented by 1 (step S14), i is incremented by 1 (step S4), and the process returns to step S2.

  If it is determined in step S9 that the IDR is not the first IDR detected after the recording start instruction, the playback time from the previous S_POS to the current S_POS is set to {PTS (k) −PTS (k−1)}. (Step S11). It is determined whether or not the calculated reproduction time is a predetermined time or more (step S12). If the calculated reproduction time is less than the predetermined time, i is incremented by 1 (step S4), and the process returns to step S2.

  If it is determined in step S12 that the reproduction time calculated in step S11 is equal to or longer than the predetermined time, a division point is determined (step S13). A process for determining the division point will be described. As shown in FIG. 10, S_POS indicates the i-th TS packet that transmits the first byte of the PES packet including the IDRAU for which the division point is determined. E_POS indicates a TS packet that transmits the last byte of the AU immediately before the IDRAU for which the division point is determined. The division point is arbitrarily set between the TS packet indicated by E_POS and the TS packet indicated by S_POS. However, it is set at the break of TS packets.

  When the division point is determined, k is incremented by 1 (step S14), i is incremented by 1 (step S4), and the process returns to step S2.

  When the division instruction unit 16 determines the recording start point or the division point, the division instruction unit 16 notifies the file / directory control unit 14 of the recording start instruction or the division instruction. When the division instruction unit 16 determines the recording start point or division point, the division instruction unit 16 notifies the recording format conversion unit 13 of the recording start point or division point. Further, when the division instruction unit 16 determines the division point, the division instruction unit 16 notifies the management information construction unit 15 of the recording start date and time information and the reproduction time regarding the recording unit (division unit) before the division point.

[3-2] Operation of File / Directory Control Unit 14 FIG. 11 shows a procedure of file / directory control processing by the file / directory control unit 14.

  When a recording start instruction is notified from the division instruction unit 16, it is determined whether or not an SD_VIDEO directory (see FIG. 2) exists (step S21). If the SD_VIDEO directory exists, the process proceeds to step S23. If the SD_VIDEO directory does not exist, after the SD_VIDEO directory is arranged (step S22), the process proceeds to step S23.

  In step S23, it is determined whether or not an MGR_INFO directory (see FIG. 2) exists under the SD_VIDEO directory. If the MGR_INFO directory exists, the process proceeds to step S25. If the MGR_INFO directory does not exist, the MGR_INFO directory is placed under the SD_VIDEO directory, and an MGR_DATA file and a PRG_MGR file are newly created under the MGR_INFO directory (step S24), and the process proceeds to step S25.

  In step S25, it is determined whether or not N predetermined PRG directories can be arranged. If N PRG directories cannot be arranged, it is determined that recording is not possible (step S26), and this is notified to each unit. As a result, the recording process is stopped.

  If it is determined in step S25 that N predetermined PRG directories can be arranged, 1 is set to k (step S27). A PRG (k) directory is arranged, and a PGI file, a MOD file, and an MOI file are newly created under the PRG (k) directory (step S28). The recording format conversion unit 13 designates the path to the MOD file, and the management information construction unit 15 designates the path to the PGI file and the MOI file. Then, it waits for a division instruction from the division instruction unit 16 (step S29).

  When a division instruction is notified from the division instruction unit 16, it is determined whether or not k = N (step S30). If k = N is not satisfied, k is incremented by 1 (step S31), and then the process proceeds to step S33. If k = N, after setting k to 1 (step S32), the process proceeds to step S33.

  In step S33, it is determined whether or not a PRG (k) directory exists. If the PRG (k) directory does not exist, that is, if the PRG (k) directory is not arranged in step S28, the process returns to step S28.

  If it is determined in step S33 that the PRG (k) directory exists, that is, if the PRG (k) directory is arranged in step S28, the PRG (k) directory is deleted and PRG_MGR After deleting the information on the PRG (k) directory from the file (step S34), the process returns to step S28.

  For example, when N = 3, it is repeatedly used while reusing the PRG directory as PRG (1) → PRG (2) → PRG (3) → PRG (1) → PRG (2). To continue the recording process. If the PRG001 directory, the PRG002 directory, and the PRG003 directory can be arranged, the PRG001 directory can correspond to PRG (1), the PRG002 directory to PRG (2), and the PRG003 directory to PRG (3).

[3-3] Operation of the recording format conversion unit 13

  The recording format conversion unit 13 converts the data from the TS packet designated by the recording start point instruction or the division point instruction from the division instruction unit 16 into a MOD file designated by the file / directory unit 14 immediately after the instruction. Write while converting to a predetermined format.

[3-4] Operation of management information construction unit 15

  The management information construction unit 15 sends information such as recording start date / time information and playback time information related to the recording unit before the division point, which is notified from the division instruction unit 16 when the division point is determined, to the file / directory before the division point is determined. Write to the PGI file and MOI file instructed by the unit 14. Further, in the PRG_MGR file, information such as reproduction time information relating to this recording unit (program) and information such as the number of PRG directories (number of programs) under the SD_VIDEO directory are updated.

[4] Operation of PC2 as a playback device

[4-1] Directory structure of recording medium of PC2

  FIG. 12 shows a directory structure constructed in the HDD (second recording medium) of the PC 2.

  Subdirectories SD1, SD2,... Are arranged immediately below the root directory. The subdirectory name may be any name that can be managed in the HDD. An SD_VIDEO subdirectory is arranged directly under the subdirectories SD1, SD2,... According to the rules of the file / directory structure of the SD memory card shown in FIG. 2 under the SD_VIDEO subdirectory. Place the directory. That is, a virtual SD memory card is constructed directly under the subdirectories SD1, SD2,. If the number of PRG directories exceeds the maximum number of PRG directories (programs) that can be managed by the PRG_MGR file in one virtual SD memory card, another virtual SD memory card is constructed in the HDD.

[4-2] Reproduction process in PC2

  The PC 2 reproduces the data moved to the HDD while moving the data recorded on the SD memory card (first recording medium) 17 by the mobile phone to the HDD (second recording medium) of the PC 2. The data reproduction program (data reproduction means) is installed. The data reproduction means includes movement processing means for performing data movement processing, reproduction processing means for performing reproduction processing of the moved data, and reproduction control processing means for controlling the reproduction processing means.

[4-2-1] Movement processing

  FIG. 13 shows a procedure of movement processing performed by the movement processing means.

  When a reproduction instruction is issued by the user, k is set to 1 and i is set to 001 (step S41). Then, the virtual SD card (k) is generated on its own recording medium (step S42).

  With reference to the directory / file structure under the SD_VIDEO directory on the SD memory card 17 of the mobile phone 1, the state is stored as an initial state (step S43). Thereafter, when a predetermined time has elapsed (step S44), it is determined whether or not a PRG directory is newly created under the SD_VIDEO directory on the SD memory card (step S45).

  That is, it is determined whether information such as recording start date / time information and reproduction time information regarding the recording unit (program) by the management information construction unit 15 has been written in the PGI file and the MOI file. This determination is made based on the presence / absence of each PRG directory (program) and information such as recording start date / time information and reproduction time information described in the PGI file and MOI file related to each program. Regarding the first loop, information such as the presence / absence of each PRG directory, the recording start date / time information described in the PGI file and the MOI file related to each program, and the reproduction time information stored as the initial state in step S43 is compared. It is determined whether or not a PRG directory has been created. As for the second and subsequent loops, as will be described later, the state on the SD memory card 17 of the mobile phone 1 is changed by the movement process in step S50, so that this is maintained and the same as in the first loop. It is determined whether a new PRG directory has been created. If a new PRG directory has not been created under the SD_VIDEO directory on the SD memory card, after waiting for a certain period of time to elapse (step S46), the process returns to step S45.

  If it is determined in step S45 that a PRG directory has been newly created under the SD_VIDEO directory on the SD memory card, whether or not the i-th PRG directory (PRGi directory) can be placed on the virtual SD card (k), That is, it is determined whether or not the upper limit of the number of PRG directories that can be managed on the virtual SD card (k) is exceeded (step S47). If the arrangement of the i-th PRG directory does not exceed the upper limit of the number of PRG directories that can be managed on the virtual SD card (k), the process proceeds to step S50.

  In step S50, the files under the PRG directory are moved under the PRGi directory on the virtual SD card (k). In addition, the PRG directory to be moved on the SD memory card 17 of the mobile phone 1 is deleted, and information on the PRG directory (program) is deleted from the PRG_MGR file on the SD memory card 17 of the mobile phone 1. 1 is subtracted from the number of PRG directories (number of programs) under the SD_VIDEO directory. Further, information about the PRG directory (program) is described in the PRG_MGR file on the virtual SD card (k), and 1 is added to the number of PRG directories (number of programs) under the SD_VIDEO directory. After performing the process of step S50, the value of i is updated to i + 001 (step S51). Then, the process returns to step S45.

  If it is determined in step S47 that the upper limit of the number of PRG directories that can be managed on the virtual SD card (k) is exceeded due to the arrangement of the i-th PRG directory, k is incremented by 1 and i is set to 001. After setting (step S48), the virtual SD card (k) is generated on its own recording medium (step S49). Then, the process proceeds to step S50. After performing the process of step S50, the value of i is updated to i + 001 (step S51). Then, the process returns to step S45.

  If there are many PRG directories under the SD_VIDEO directory on the SD memory card 17 of the mobile phone 1, the processing becomes heavy. In order to reduce this processing, the range of the PRG directory on the SD memory card 17 of the mobile phone 1 used between the playback device (PC2) and the data recording device (mobile phone 1) at the start of playback, or A list of PRG directories to be used may be negotiated.

[4-2-2] Reproduction processing

  FIG. 14 shows the procedure of the reproduction process performed by the reproduction processing means.

  If there is a reproduction instruction from the user, k is set to 1 and i is set to 001 (step S61). Then, it waits for a control instruction from the reproduction control processing means (step S62). Processing by the reproduction control processing means will be described later. If there is a control instruction from the reproduction control processing means, it is determined whether or not it is a reproduction start instruction (step S63). If it is not a reproduction start instruction, the process returns to step S62.

  If it is determined in step S63 that the control instruction from the reproduction control processing means is a reproduction start instruction, the PRGi directory in the virtual SD card (k) is specified as a reproduction target (step S64). Then, a process for reading data from the reproduction target and a process for reproducing the read data are performed (step S65). Thereafter, the value of i is updated to i + 001 (step S66).

  Next, it is determined whether or not the i-th PRG directory that is the next reproduction target can be the reproduction target, that is, whether or not the upper limit of the number of PRG directories that can be managed on the virtual SD card (k) is exceeded. (Step S67). When the i-th PRG directory to be reproduced next does not exceed the upper limit of the number of PRG directories that can be managed on the virtual SD card (k) and can be reproduced, the PRG directory to be reproduced next is specified. After notifying the reproduction control means of information (k, i) to be performed (step S69), the process proceeds to step S70.

  In step S67, if the i-th PRG directory to be reproduced next exceeds the upper limit of the number of PRG directories that can be managed on the virtual SD card (k) and cannot be reproduced, k is incremented by 1. In addition, after setting 001 to i (step S68), information (k, i) for specifying the PRG directory to be reproduced next is notified to the reproduction control means (step S69). Then, the process proceeds to step S70.

  In step S70, a control instruction from the reproduction control processing means is awaited. If there is a control instruction from the reproduction control processing means, it is determined whether or not it is a reproduction continuation instruction (step S71). If it is a reproduction continuation instruction, the process returns to step S64. If it is not a reproduction continuation instruction, that is, if it is a reproduction stop instruction, the process returns to step S62.

[4-2-3] Reproduction control processing

  FIG. 15 shows the procedure of the reproduction control process performed by the reproduction control processing means.

  When there is a reproduction instruction by the user, k is set to 1 and i is set to 001 (step S81). Then, it is determined whether or not data exceeding a predetermined reproducible amount has been moved to the PRG directory after the PRGi directory on the virtual SD card (k) to be reproduced (step S82). As for the amount of data that has been moved to the PRG directory after the PRGi directory on the virtual SD card (k) to be reproduced, the file movement of the PRG directory after the PRGi directory on the virtual SD card (k) is completed. It is obtained by acquiring the reproduction time information written in the PGI file or MOI file of each PRG directory and adding them. The amount of data may be the total number of MOD file sizes under each PRG directory that has been moved, among the PRG directories after the PRGi directory on the virtual SD card (k).

  When data exceeding the predetermined reproducible amount has not been moved to the PRG directory after the PRGi directory on the virtual SD card (k) to be reproduced from now on, after waiting for a certain period of time to elapse (step S83) ), The process returns to step S82.

  If it is determined in step S82 that data exceeding a predetermined reproducible amount has been moved to the PRG directory after the PRGi directory on the virtual SD card (k) to be reproduced, reproduction is started by the reproduction processing means. Is instructed (step S84). As described above, the reason for instructing the start of reproduction when the predetermined reproducible amount is exceeded is to allow the reproduction processing means to continue reproduction continuously.

  When the reproduction processing means is instructed to start reproduction, the reproduction processing means waits for notification of information (k, i) for specifying the PRG directory to be reproduced next (step S85). When information (k, i) for specifying the next reproduction PRG directory is notified from the reproduction processing means, k notified to k is set and i notified to i is set (step S86).

  Then, it is determined whether or not there is a PRG directory to be reproduced next in the storage medium (step S87). That is, it is determined whether the PRGi directory of the virtual SD card (k) exists in the storage medium. If the next playback PRG directory exists in the storage medium, the playback processing means is instructed to continue playback (step S89), and the process returns to step S85.

  If it is determined in step S87 that the next playback PRG directory does not exist in the storage medium, the playback processing unit is instructed to stop playback (step S88), and the process returns to step S82.

[4-3] Aggregation of subdivided files

  By the way, a recording file for each of a plurality of division units obtained by dividing the recording target data is arranged on the recording medium on the playback apparatus side (PC2 side). Rather than managing files in a divided state, management of these files as a single program is easier to manage and can be easily moved to other playback devices.

  Therefore, it is preferable that the playback device side (PC2 side) has a function of connecting the recording files for each of the plurality of division units. That is, the MOD files are linked in order from the oldest recording start date / time information with reference to the recording start date / time information written in the PGI file or MOI file arranged in each PRG directory. That is, the MOD file arranged in each PRG directory is changed to one MOD file. In addition, management files such as PGI files and MOI files are also connected to one file. For example, the reproduction time information is added to the reproduction time information described in the PGI file or MOI file arranged in each PRG directory, and is reflected in each management information file. The MOD file that is the entity of the moving image data, the PGI file that is the management file, and the MOI file that are grouped together are arranged and managed under one PRG directory.

  Further, as described in the above embodiment, if the virtual SD card (1) and the PRG001 directory are sequentially arranged, they may be connected in that order without referring to the recording start date / time information.

  Further, this concatenation process may be executed at a timing when the reproduction process is not performed, or the concatenation process may be executed in order from the PRG directory where the reproduction is completed while performing the reproduction process.

It is a block diagram which shows the structure of a data recording / reproducing system. It is a schematic diagram which shows the file / directory structure which SD memory card has. FIG. 2 is a block diagram showing a configuration of a part that receives and records digital broadcasts in the mobile phone 1. It is a schematic diagram which shows that the PES packet is comprised from several TS packet. It is a schematic diagram which shows TS stream. H. 2 is a schematic diagram illustrating a relationship between an H.264 / AVC bit stream and a PES packet. FIG. 5 is a schematic diagram for explaining a basic operation of a division instruction unit 16. FIG. 7 is a flowchart showing a procedure for determining a recording start point and a division point by a division instruction unit 16. It is a schematic diagram which shows the TS packet which E_POS and S_POS point at the time of recording start point determination. It is a schematic diagram which shows the TS packet which E_POS and S_POS point at the time of a division | segmentation point determination. 4 is a flowchart showing a procedure of file / directory control processing by a file / directory control unit 14; 3 is a schematic diagram showing a directory structure of a recording medium of PC2. FIG. It is a flowchart which shows the procedure of the movement process performed by a movement process means. It is a flowchart which shows the procedure of the reproduction | regeneration processing performed by the reproduction | regeneration processing means. It is a flowchart which shows the procedure of the reproduction | regeneration control processing performed by the reproduction | regeneration control processing means.

Explanation of symbols

1 Mobile phone 2 PC
3 USB cable 17 SD memory card

Claims (11)

Moving image data receiving means for receiving a stream including compressed and encoded moving image data;
Recording target data extracting means for extracting desired recording target data from the received stream;
A first recording medium for recording the recording target data extracted by the recording target data extracting means;
Each division unit obtained by dividing the recording target data based on the division points determined by the division point determining means for determining the division points of the recording target data extracted by the recording target data extracting means, and the division point determining means A data recording device comprising: data recording means for recording the data as different files on the first recording medium. The number of files for storing the division unit is set to a predetermined number, and the data recording means cyclically switches the file for storing the division unit within the predetermined number. The data recording device described. The division point determining means determines the division point so that the division unit has a playback time of a predetermined time length and all video frames included in the division unit can be decoded. The data recording apparatus according to claim 1, wherein the data recording apparatus is provided. The moving image data is H.264. 264 / AVC, and the division point determination means determines the division point so that the division unit has a reproduction time of a predetermined time length and includes at least one IDRAU. The data recording apparatus according to claim 1. 5. The data recording apparatus according to claim 1, wherein the file is a file conforming to an SD-Video standard. A data reproducing apparatus for reproducing data recorded on a first recording medium by the data recording apparatus according to claim 1,
A second recording medium,
Movement processing means for sequentially moving the divided units recorded on the first recording medium to the second recording medium, and the divided unit to be reproduced next from among the divided units moved to the second recording medium A playback processing means for identifying and reproducing the identified division unit;
A data reproducing apparatus comprising: It is characterized by comprising a reproduction control processing means for calculating how much moving image data to be reproduced is moved to the second recording medium and controlling the reproduction processing means in accordance with the calculation result. The data reproducing apparatus according to claim 6. A data recording device and a data reproducing device,
Data recording device
Moving image data receiving means for receiving a stream including compressed and encoded moving image data;
Recording target data extracting means for extracting desired recording target data from the received stream;
A first recording medium for recording the recording target data extracted by the recording target data extracting means;
Dividing point determining means for determining the dividing point of the recording target data extracted by the recording target data extracting means, and each dividing unit obtained by dividing the recording target data based on the dividing point determined by the dividing point determining means Data recording means for recording the data as different files on the first recording medium,
The data playback device
A second recording medium,
Moving processing means for sequentially moving the divided units recorded on the first recording medium to the second recording medium, and the divided unit to be reproduced next from among the divided units moved to the second recording medium A data recording / reproducing system comprising: a reproduction processing unit for identifying the specified division unit and reproducing the identified division unit. A data reproduction program for reproducing data recorded on a first recording medium by the data recording apparatus according to claim 1,
Computer
Movement processing means for sequentially moving the divided units recorded on the first recording medium to the second recording medium, and the divided unit to be reproduced next from among the divided units moved to the second recording medium A playback processing means for identifying and reproducing the identified division unit;
Data reproduction program to function as The computer functions as means for grouping a plurality of division units moved to the second recording medium by the movement processing means into one moving image data in order from the oldest recording start date and time and rearranging them on the second recording medium The data reproduction program according to claim 9, further comprising a program for causing the data to be reproduced. When data is being reproduced, the computer is provided as means for grouping a plurality of division units to be reproduced into one moving image data in order from the division unit for which reproduction has been completed and rearranging them on the second recording medium. 10. The data reproduction program according to claim 9, further comprising a program for causing it to function.

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