JP4342977B2 - Recording / reproducing apparatus, control method for recording / reproducing apparatus, control program for recording / reproducing apparatus, and recording medium storing control program for recording / reproducing apparatus - Google Patents

Description

  The present invention relates to a recording / reproducing apparatus using an MPEG (Moving Picture Experts Group) system, which is a moving picture / audio coding system, and in particular, reads recorded video data for each GOP (Group Of Picture). The present invention relates to a video data reproducing apparatus of a recording / reproducing apparatus which converts each frame constituting each into two or more fields by a pull-down method, selects an arbitrary GOP, and continuously reproduces it.

  In recent years, moving image data is recorded on a random-accessible recording medium such as an optical disk, and editing is performed at an arbitrary position without actually rewriting data by utilizing the random accessibility. Destructive editing is now possible.

  MPEG-2 is adopted as a standard format of a moving image / audio encoding method for recording on an optical disk or the like which is a recording medium that can be randomly accessed. However, in MPEG-2, since encoding is performed using inter-frame prediction rather than encoding independently in units of frames, editing in units of frames is generally not easy. Accordingly, editing is performed in units of randomly accessible GOPs composed of a plurality of frames.

  Note that a frame is a unit constituting a video, and one video is one frame. In addition, in order to enable random access, the GOP periodically inserts an encoded screen (intra-coded picture (I-picture)) based on information closed only within the screen, This intra-frame encoded screen has a screen group structure containing at least one frame. That is, the GOP is composed of a plurality of frames. In addition to the above-described I-picture, the GOP includes an inter-frame encoded frame (predictive-coded picture: P-picture) and a frame-interpolated encoded frame (bidirectionally predictive-coded picture: B). -Picture) may be included.

  By the way, many contents such as movies are taken at a frame rate of 24 Hz. On the other hand, the captured content is displayed at a frame rate of 30 Hz (field rate 60 Hz) on an interlaced display (display device displayed by interlace) such as a television.

  Therefore, in MPEG-2, when displaying encoded data of a moving image such as a movie having a frame rate of 24 Hz on an interlaced display that displays at a field rate of 60 Hz, the first field is periodically displayed repeatedly. Frame rate conversion is performed by a method called 2: 3 pull-down. Then, in the field of the converted frame, the top field (even field) and the bottom field (odd field) are repeated, and the frame displayed in the 2-field period and the frame displayed in the 3-field period are alternately displayed. .

  The field is either divided into even lines or odd lines, and the top field is the first line (top line) when the display screen of 480 lines is counted from 0 to 479. This is a field (even field) including 0 lines. On the other hand, the bottom field is a field (odd field) including 479 lines as the last line (bottom line).

  Here, with reference to FIG. 15, an example in which the above-described moving image encoded data with a frame rate of 24 Hz is converted into the 2: 3 pull-down method is shown. FIG. 15 is a diagram illustrating a correspondence relationship between the frame display of the recording data and the display image, the pull-down display of the display image, the TFF (top_field_first) flag, and the RFF (repeat_first_field) flag.

In FIG. 15, frame I indicates an I-picture, frame B indicates a B picture, and frame P indicates a P picture. Subscript numbers of frame symbols indicate a display order in order from 0. Yes. That is, when 24 Hz moving image encoded data (recording data) is displayed as it is at 24 Hz, the display image is in the order of frames B ₀ , B ₁ , I ₂ . When 2: 3 pull-down conversion is performed on each frame, B ₀ becomes t · b, B ₁ becomes t · b · t, and I ₂ becomes b · t. Here, t indicates a top field, and b indicates a bottom field.

The TFF flag is a flag used for setting a field order in the field structure. When the TFF flag is 1, it indicates that the top field is first in the field structure. Therefore, in the case of a frame whose TFF flag is 1, the field structure is the order of the top field and the bottom field (t · b). For example, in FIG. 15, frame B ₀ has a TFF flag of 0, and the fields are in the order of t · b.

  Further, the RFF flag is a code used for converting, for example, a 2: 3 pull-down method or a 3: 2 pull-down method in order to reproduce (display) a moving image having a frame rate of 24 Hz at a field rate of 60 Hz. In FIG. 15, when this code is 1, it indicates that the first field displayed earlier is repeatedly displayed.

More specifically, for example, the B ₀ frame of the display image shown in FIG. 15 has a TFF flag of 1, so the pull-down display of B ₀ is in the order of t · b as described above. Further, since the RFF flag is 0, it is not necessary to repeat the first field displayed earlier, that is, t. Therefore, the pull-down view of the frame of the B ₀ is a field structure that t · b.

Meanwhile, _{B 1} frame, because TFF flag is 1, the pull-down display will be the order of t · b. Further, since the RFF flag is also displayed as 1, the first field displayed earlier, that is, t is repeated. Therefore, a pull-down display of B ₁ frame is field structure that t · b · t.

  The TFF flag and the RFF flag are flags included in the MPEG2 picture encoding function extension (picture_coding_extension) of each frame.

  As described above, the frame displayed in the 2-field period and the frame displayed in the 3-field period are alternately displayed depending on whether the RFF flag displays 1 or 0. That is, 2 frames are displayed for 5 fields by the 2: 3 pull-down method, and the content of 24 frames per second is converted to 60 fields per second.

  However, by performing such conversion for the frame rate, it cannot be guaranteed that the first field of the frame is necessarily the top field or the bottom field. Therefore, for example, as shown in FIG. 16, when editing the encoded data composed of GOP1 and GOP3 from the encoded data of the moving image composed of GOP1, GOP2 and GOP3, the phase of the field is It may shift.

  FIG. 16 shows the frame structure for each GOP and the field structure of the frame. The encoded data composed of GOP1, GOP2, and GOP3 is edited so that it is composed of GOP1 and GOP3. FIG.

For example 2: The 3 pull-down system, to convert the two frames so as to display 5 field of the connection portion between the GOP1 and GOP3, that is, the last field of the frame P _8, the front row of the field of the frame B ₀ Are both b (bottom field). That is, a periodic change of the field formed by circulation of the top field and the bottom field between GOP1 and GOP3, that is, the state of the phase of the field is shifted.

  Accordingly, even when editing the encoded data of the moving image in units of GOP, the phase of the field may be shifted at the connection portion between GOP1 and GOP3 as shown in FIG. 16, and GOP1 and GOP3 are continuously connected. And it becomes difficult to play.

Therefore, in order to avoid the problems that occur when editing the encoded data of the moving image described above, the editing is performed in advance so that the last field of the frame constituting each GOP is always the bottom field when encoding the moving image data. A possible point insertion method has been proposed (see, for example, Patent Document 1).
JP 11-88874 A (published March 30, 1999)

  However, in the method of Patent Document 1, the field phase must be adjusted in advance when encoding moving image data. Therefore, the editable point in which the field phase is adjusted at the time of encoding during reproduction. The problem arises that only editing is possible. That is, editing cannot be performed where adjustment is not performed when encoding moving image data.

  Further, in the method of Patent Document 1, in order to increase the degree of editing freedom, if the GOP as an editing unit is shortened or the GOP is switched at a scene switching point or the like, The number of places where the phase of the field needs to be adjusted increases. For this reason, when the moving image data to be reproduced is reproduced, there arises a problem that the time required for the reproduction differs from the recorded real time.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to set an editing position of video data in advance at the time of recording even when the frame rate is changed at the time of reproducing the video data. Video data reproducing apparatus that can edit video data freely during reproduction, video data reproducing apparatus control method, video data reproducing apparatus control program, and recording medium storing video data reproducing apparatus control program Is to provide.

In order to solve the above-described problem, the recording / reproducing apparatus according to the present invention includes first stream data that is data generated by compressing information of an input moving image, and stream data generated from another moving image. A recording / reproducing apparatus for continuously reproducing in combination with the second stream data, wherein the first stream data and the second stream data are respectively generated and recorded on a recording medium. Management information generating means for generating management information including field phase information for identifying whether the field of the frame displayed at the head of the second stream data is a top field or a bottom field; and the management information generating means The first stream data and the second stream based on the management information generated by Playlist information generating means for generating playlist information, which is information necessary for continuous playback of data, and the field displayed at the end of the last frame in the first stream data is a top field, or Check whether the field is a bottom field, and refer to the field phase information included in the management information to determine whether the field phases of adjacent frames of the first stream data and the second stream data are the same. And a recording unit that records the playlist information generated by the playlist information generation unit in a recording medium in association with each of the first stream data and the second stream data. The playlist information generating means outputs the determination result by the phase determining means to the above Characterized in that it created included in the playlist information.

Further, the recording / reproducing apparatus according to the present invention, in the above configuration, includes information regarding the first stream data and the second stream data that are continuously reproduced and included in the playlist information recorded on the recording medium. Playlist confirmation means for confirming whether or not the phase of the field of adjacent frames of the first stream data and the second stream data associated with the playlist information is the same, and the playlist confirmation According to the playlist information confirmed by the means, the reading means for reading out the first stream data and the second stream data associated with the playlist information from the recording medium, and the playlist confirmation means The first stream data and the second stream data are adjacent to each other If the field of phase shift between the frames is confirmed, a phase rule changing unit for performing phase adjustment of the field, may be configured to include a.

In the recording / reproducing apparatus according to the present invention, in the above configuration, the management information generating unit is a GOP that is a randomly accessible unit configured by a plurality of frames in each of the first stream data and the second stream data. The field phase information may be created every time.

Further, in the recording / reproducing apparatus according to the present invention, in the above configuration, the management information generating means is information relating to a display format of a field display by a pull-down method for each GOP in each of the first stream data and the second stream data. May be included in the management information and recorded.

In order to solve the above-described problem, the recording / reproducing apparatus control method according to the present invention provides first stream data that is data generated by compressing information of an input moving image and stream data generated from another moving image. A method for controlling a recording / reproducing apparatus that continuously reproduces the second stream data in combination with the second stream data when the first stream data and the second stream data are respectively generated and recorded on a recording medium. A management information generating step for generating management information including field phase information for identifying whether a field of a frame displayed at the top of the first stream data and the second stream data is a top field or a bottom field; Based on the management information generated in the management information generation step, the first stream data is generated. A playlist information generation step for generating playlist information, which is information necessary for continuously reproducing data and the second stream data, and a field displayed at the end of the last frame in the first stream data. Confirming whether the field is a top field or a bottom field, and referring to the field phase information included in the management information, the phase of the field between adjacent frames of the first stream data and the second stream data is A phase determination step for determining whether or not they are the same, and a recording step for recording the playlist information generated in the playlist information generation step on a recording medium in association with the first stream data and the second stream data. In the playlist information generation step, The determination result in the phase determination step, characterized in that to create included in the playlist information.

  The recording / reproducing apparatus 1 according to the present embodiment captures a moving image, encodes and compresses the captured moving image data, records the encoded moving image data on the optical disc 15, and stores encoded data of the moving image recorded on the optical disc 15. It is a device that can read and reproduce.

  That is, as shown in FIG. 2, the recording / reproducing apparatus 1 includes an image conversion device (video data reproducing device) 2, a display device 3, a photographing device 4, and a recording / reading device 16. FIG. 2 is a block diagram showing an example of a main configuration of the recording / reproducing apparatus 1 according to the present embodiment.

  The photographing device 4 photographs a subject, and moving image data obtained by photographing the subject is input to the image conversion device 2 as an AV signal. The moving image data of the subject is captured at a frame rate of 24 Hz.

  The image conversion device 2 encodes moving image data based on the AV signal input from the photographing device 4, removes redundant information contained in the input AV signal, and compresses the information into a data string (encoded data). ) Is generated. The image conversion device 2 also converts, for example, stream data read from the optical disc 15 into data that can be displayed on the display device 3. The detailed configuration of the image conversion apparatus 2 will be described later.

  The recording / reading device 16 records the stream data compressed by the image conversion device 2 on the optical disc 15 and reads the stream data recorded on the optical disc 15. The recording / reading device 16 transmits the read stream data to the image conversion device 2.

  The display device 3 displays and reproduces a moving image based on the data transmitted from the image conversion device 2. The display device 3 is configured to display an image by interlaced scanning.

  The optical disk 15 on which stream data is recorded or read by the recording / reading device 16 is a random-accessible readable / writable recording medium. That is, the optical disk 15 is, for example, a magnetic disk such as a flexible disk / hard disk or an optical disk such as MO (Magneto Optical Disk) / MD (Mini Disc) / DVD (Digital Versatile Disk) / CD-R (CD Recordable). May be. Further, instead of the optical disc 15, a recording medium such as a card such as an IC card / optical card may be used.

(Configuration of Image Conversion Device 2)
The configuration of the image conversion apparatus 2 will be described with reference to FIG. FIG. 3 is a block diagram illustrating an example of a main configuration of the image conversion apparatus 2 according to the present embodiment.

  As shown in FIG. 3, the image conversion apparatus 2 includes a system controller 11, a ROM (Read Only Memory) (recording medium) 12, a RAM (Random Access Memory) 13, a synchronization control unit 14, a playback stream buffer 17, a recording stream. Buffer 26, system decoder 18, system encoder 27, switch 19, data analysis unit 20, data rewriting unit (phase rule changing unit) 21, video buffer 22, audio buffer 24, video buffer 28, audio buffer 30, video decoder 23, The audio decoder 25, video encoder 29, audio encoder 31, external input unit 32, and bus 33 are provided.

  The video encoder 29 compresses and encodes the AV (video) signal input from the photographing apparatus 4 by the MPEG2 system. The audio encoder 31 compresses and encodes an input AV (audio) signal by, for example, the MPEG-1 Layer-II system.

  The video encoder 29 transmits the encoded video data to the system encoder 27 via the video buffer 28, and the audio encoder 31 transmits the encoded audio data to the system encoder 27 via the audio buffer 30. To do.

  Note that when the encoded video data and the encoded audio data are transmitted to the system encoder 27, the encoded video data is delayed in the video buffer 28, and the encoded audio data is the audio data. Delay is performed in the buffer 30, and the timing of both data is adjusted and transmitted to the system encoder 27.

  The system encoder 27 multiplexes the encoded video data and the encoded audio data, which are input via the video buffer 28 and the audio buffer 30, respectively, so as to be synchronized during reproduction.

  The system encoder 27 sends stream data, which is multiplexed video and audio encoded data, to the recording / reading device 16 via the recording stream buffer 26.

  The recording / reading device 16 records the stream data input via the recording stream buffer 26 on the optical disc 15 and reads the stream data recorded on the optical disc 15. The recording / reading unit 16 sends the stream data read from the optical disc 15 to the system decoder 18 via the playback stream buffer 17. Note that the recording / reading of the stream data by the recording / reading device 16 is performed in units of GOP (frame group) in the stream data.

  The system decoder 18 demultiplexes the stream data into encoded video data and encoded audio data. The system decoder 18 transmits encoded video data to the switch 19 in GOP units, while transmitting encoded audio data to the audio buffer 24 in GOP units.

  The switch 19 switches the transmission destination of the encoded data in accordance with the determination whether the phase of the frame field of the encoded data of the video from the playlist recognition unit 47 is necessary. The switch 19 transmits the encoded data to the data analysis unit 20 when the encoded data requires field phase adjustment. If adjustment of the field phase of the encoded video data is unnecessary, the encoded data is transmitted to the video decoder 23 via the video buffer 22.

  The determination regarding whether or not the playlist recognition unit 47 needs to adjust the phase of the encoded data field will be described later.

  Here, the frame is a unit constituting a video of moving image data, and one video is one frame. Further, since the recording / reproducing apparatus 1 according to the present embodiment is configured to display an image on the display device 3 by interlace, the frame is divided into odd lines and even lines. The field is divided into odd lines or even lines, and two fields form one frame.

  An odd line field is a bottom field, and an even line field is a top field. Since the bottom field and the top field are displayed alternately, a phase of the field that circulates and periodically changes with the top field, the bottom field or the bottom field, and the top field is formed.

  Further, the adjustment of the phase shift of the field is to adjust the phase shift of the field of the connection portion between different stream data when a plurality of stream data are continuously reproduced. Details of the phase adjustment processing of this field will be described later.

  The data analysis unit 20 analyzes the MPEG2 picture coding function extension unit (picture_coding_extension) related to the GOP frame to be reproduced last in the stream data immediately before the connection unit 70 or the connection unit 71, and sets an RFF (repeat_first_field) flag. This specifies the value of.

  The data rewriting unit 21 inverts the value indicated by the RFF flag in the picture coding function extension unit (picture_coding_extension) analyzed by the data analysis unit 20. As will be described later, the data rewriting unit 21 can invert the field phase shift by inverting the value of the RFF flag. When the data rewriting unit 21 adjusts the phase of the encoded video data field, the data rewriting unit 21 outputs the GOP of the encoded video data to the video buffer 22.

  It should be noted that various information necessary for decoding MPEG2 is described in an extension unit such as a picture encoding function extension unit (picture_coding_extension).

  The video decoder 23 decodes the encoded data of the video input via the video buffer 22 and outputs an AV (video) signal so that it can be displayed on the display device 3. The audio decoder 25 combines the encoded audio data input via the audio buffer 24 and outputs an AV (audio) signal so that it can be displayed on the display device 3.

  The synchronization control unit 14 performs control for synchronizing audio encoded data and video encoded data during recording and reproduction. This synchronization control can be realized by, for example, a synchronization control method using a time stamp.

  That is, in the recording / reproducing apparatus 1, the video encoder 29 and the audio encoder 31 are provided with a reference time information (system time clock: STC) supply unit (not shown). The encoded data of video and audio is given a STC value as a time stamp for each information unit to be presented. Thereafter, when these encoded data are multiplexed by the system encoder 27, a reference time for STC reproduction is inserted. The system decoder 18 is also provided with an STC supply unit (not shown), which reproduces information on the reference time inserted in the multiplexed stream and matches the time at the time of encoding. Each encoded data is delayed in the video buffer 22 and the audio buffer 24, respectively, and is decoded by the video decoder 23 and the audio decoder 25 when the time stamp matches the STC.

  The system controller 11 refers to the ROM 12 and / or the RAM 13 and controls each device in the recording / reproducing device 1. The configuration of the system controller 11 will be described later.

  The external input unit 32 is for inputting a user instruction to the image conversion apparatus 2. In addition, the external input unit 32 can instruct the recording / reading device 16 to read the stream data recorded on the optical disc 15 via the image conversion device 2.

  The bus 33 relays input / output of various data and signals in the recording / reproducing apparatus 1, or delivery of commands from the system controller 11 or the synchronization control unit 14 to each apparatus.

(Configuration of system controller 11)
Next, the configuration of the system controller 11 will be described with reference to FIG. FIG. 1 is a block diagram illustrating an example of a main configuration of the system controller 11. In FIG. 1, the arrow lines indicate the flow of stream data read from the optical disc 15.

  As shown in FIG. 1, the system controller 11 includes a management information acquisition unit 40, a playlist transmission unit 42, a playlist generation unit 41, a phase shift determination unit (phase determination unit) 49, a management information transmission unit 43, and a management information generation A unit 44, a read file information acquisition unit 45, a read file determination unit 46, a playlist recognition unit 47, and a file read instruction unit 48.

  The management information acquisition unit 40 instructs the recording / reading device 16 to acquire management information of stream data recorded on the optical disc 15 in accordance with an instruction input from the external input unit 32. It is. The management information acquisition unit 40 records the acquired management information in the RAM 13 and transmits a signal indicating that the management information has been acquired to the playlist generation unit 41.

  The management information is information recorded for each GOP unit of the stream data recorded on the optical disc 15, and includes the creation date and time of the stream data file, the codec used for the stream data, the total playback time length of the stream data, the GOP This is information including a playback time length in units, a recording position on the optical disc 15 in GOP units, a data size in GOP units, and the like. As will be described later, field phase information for identifying whether the top display field of the top frame of the GOP is a top field or a bottom field is also recorded in this management information.

  The configuration and relationship between the management information recorded on the optical disc 15 and the stream data will be described later.

  When receiving a signal indicating that management information has been acquired from the management information acquisition unit 40, the playlist generation unit 41 creates a playlist with reference to the management information recorded in the RAM 13. The playlist generation unit 41 further instructs the phase shift determination unit 49 to determine whether or not a phase shift occurs between the stream data continuously reproduced (phase shift presence / absence determination instruction).

  The playlist generation unit 42 adds information on the presence / absence of a phase shift determined by the phase shift determination unit 49 to the created playlist and passes the information to the playlist transmission unit 41.

  In the playlist, information necessary for continuously reproducing a plurality of stream data is recorded for each GOP of stream data to be continuously reproduced.

  The information necessary to enable continuous reproduction of the plurality of stream data includes, for example, the reproduction time at the time of continuous reproduction in each GOP constituting the plurality of stream data, the recording position of each GOP, and recording on the optical disc 15. The correspondence relationship with the stream data (original data) that is the target of continuous playback.

  The phase shift determination unit 49 is a field of the first display field of the first frame of the GOP included in the management information temporarily stored in the RAM 13 in response to the determination instruction for the presence or absence of the phase shift transmitted from the playlist generation unit 41. It is determined whether or not there is a phase shift by referring to the phase information and the field phase information of the last field of the GOP of the stream data immediately before the connection unit. The phase shift determination unit 49 transmits the determination result to the playlist generation unit 41.

  The playlist transmission unit 42 instructs the recording / reading device 16 to record the playlist received from the playlist generation unit 41 on the optical disc 15.

  When the system encoder 27 multiplexes video and audio encoded data to generate stream data, the management information generation unit 44 creates a stream data file creation date, stream, and stream for each GOP constituting the stream data. Acquires information such as the codec used for data, the total playback time length of stream data, the playback time length in GOP units, the recording position on the optical disk 15 in GOP units, the data size in GOP units from the system encoder, and generates management information To do. The management information generation unit 44 transmits the generated management information to the management information transmission unit 43. The management information generation unit 44 also records the field phase information regarding the top field display (top field or bottom field) of each GOP in the management information.

  The management information transmission unit 43 instructs the recording / reading device 16 to record the management information received from the management information generation unit 44 on the optical disc 15 in association with the stream data that is the source of the management information. Is. In response to this instruction, the recording / reading device 16 records the management information on the optical disc 15 in a file format in association with the stream data.

  The file reading instruction unit 48 gives an instruction to the recording / reading device 16 to read the instructed file in accordance with the file reading instruction input from the external input unit 32.

  The read file information acquisition unit 45 acquires information about a file read by the recording / reading device 16 from the optical disc 15 in accordance with an instruction from the file reading instruction unit 48. The read file information acquisition unit 45 transmits information about the acquired file to the read file determination unit 46.

  The read file determination unit 46 determines whether the file to be reproduced is stream data or a playlist based on information about the file received from the read file information acquisition unit 45.

  As a result of this determination, if the file to be reproduced is stream data, information indicating that the file to be reproduced is stream data is transmitted to the file reading instruction unit 48. On the other hand, if the result of this determination is that the file to be played is a playlist, the playlist information is transmitted to the playlist recognition unit 47.

  The playlist recognizing unit 47 confirms information of each GOP related to a plurality of stream data reproduced continuously from the information of the playlist. The playlist recognizing unit 47 further confirms whether or not a field phase shift occurs in the connection unit between the stream data to be continuously reproduced. When the field phase shift occurs, the switch 19 is instructed to switch the data transmission path so that the encoded data of the GOP immediately before the connection unit is transmitted to the data analysis unit 20. Further, based on the information of the playlist, the file reading instruction unit 48 is instructed to read the stream data to be continuously reproduced in the order of reproduction.

  When the phase of the field does not shift, the playlist recognition unit 47 does not give any instruction to the switch 19 and only the file reading instruction unit 48 is continuously based on the playlist information. An instruction is given to read the stream data to be reproduced in the order of reproduction.

  Here, the structure which implement | achieves each functional block is demonstrated regarding the system controller 11 of the above structures.

  Each functional block is provided in the system controller 11, and these functional blocks execute a program code stored in a recording medium such as a ROM 12 or a RAM 13 by arithmetic means such as a CPU (Central Processing Unit), for example. Can be realized. Further, it can be realized by a non-volatile storage medium such as a ROM 12 in which a program for realizing each functional block of the recording / playback control unit 2 is stored.

  In the above description, each functional block has been described as an example of the case where “the arithmetic means such as the CPU executes by executing the program code stored in the recording medium such as the ROM 12 or the RAM 13”. You may implement | achieve with the hardware which performs. Further, it can also be realized by combining hardware that performs a part of the processing and the above-described calculation means that executes the program code for controlling the hardware and the remaining processing.

  Further, even among the members described above as hardware, the hardware for performing a part of the processing and the arithmetic means for executing the program code for performing the control of the hardware and the remaining processing It can also be realized by combining them. The arithmetic means may be a single unit, or a plurality of arithmetic means connected via a bus inside the apparatus or various communication paths may execute the program code jointly.

  The program code itself that can be directly executed by the computing means, or a program as data that can be generated by a process such as decompression described later, stores the program (program code or the data) in a recording medium, A recording medium is distributed, or the program is distributed by being transmitted by a communication means for transmitting via a wired or wireless communication path, and is executed by the arithmetic means.

  In addition, when transmitting via a communication path, each transmission medium which comprises a communication path propagates the signal sequence which shows a program, and the said program is transmitted via the said communication path. Further, when transmitting the signal sequence, the transmission device may superimpose the signal sequence on the carrier by modulating the carrier with the signal sequence indicating the program. In this case, the signal sequence is restored by demodulating the carrier wave on the receiving side of the carrier wave.

  On the other hand, when transmitting the signal sequence, the signal sequence as a digital data sequence may be divided into packets and transmitted in the transmission side apparatus. In this case, the receiving device concatenates the received packet groups to restore the signal sequence. Further, when transmitting a signal sequence, the transmission side may multiplex and transmit the signal sequence with another signal sequence by a method such as time division / frequency division / code division. In this case, the receiving apparatus extracts and restores individual signal sequences from the multiplexed signal sequence. In any case, the same effect can be obtained if the program can be transmitted via the communication path.

  Here, it is preferable that the recording medium for distributing the program is removable, but it does not matter whether the recording medium after distributing the program is removable. In addition, the recording medium may be rewritten (writeable), volatile, or the recording method and shape as long as a program is stored. Examples of recording media include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks and hard disks, CD-ROMs, magneto-optical disks (MO), mini-discs (MD) and digital A disk such as a versatile disk (DVD) can be mentioned.

  The recording medium may be a card such as an IC card or an optical card, or a semiconductor memory such as a mask ROM, EPROM, EEPROM, or flash ROM. Or the memory formed in calculating means, such as CPU, may be sufficient.

  The program code may be a code for instructing the arithmetic means of all the procedures of the processes, or a basic program capable of executing a part or all of the processes by calling according to a predetermined procedure. If (for example, an operating system or a library) already exists, a part or all of the entire procedure may be replaced with a code or a pointer that instructs the arithmetic means to call the basic program.

  The format for storing the program in the recording medium may be a storage format that can be accessed and executed by the arithmetic means, for example, as in a state where the program is stored in the real memory, or is stored in the real memory. Installed in the local recording medium from the storage format after being installed in a local recording medium (for example, real memory or hard disk) that is always accessible by the computing means, or from a network or a transportable recording medium The previous storage format may be used.

  Further, the program is not limited to the compiled object code, but may be stored as source code or intermediate code generated during interpretation or compilation. In any case, the above calculation is performed by a process such as decompression of compressed information, decoding of encoded information, interpretation, compilation, linking, allocation to real memory, or a combination of processes. If the means can be converted into an executable format, the same effect can be obtained regardless of the format in which the program is stored in the recording medium.

(Data recorded on the optical disk 15)
In the recording / reproducing apparatus 1 according to the present embodiment, the recording / reading apparatus 16 is configured to record management information together with stream data on the optical disc 15 in a file format.

  First, management information will be described.

  As described above, the management information includes the creation date and time of the stream data file, the codec used for the stream data, the total playback time length of the stream data, the playback time length in GOP units, the recording position on the optical disk 15 in GOP units, and GOP units This is information consisting of the data size and the like. Further, as shown in FIG. 6, this management information is configured to record field phase information for identifying whether the top display field of the top frame of the GOP is a top field or a bottom field. FIG. 6 is a diagram showing the correspondence between each GOP of stream data and the phase information of the display field of the first frame in the GOP.

  For example, this information can be managed by recording “1” in the field phase information (TOP / BOT) when the top display field is the top field and recording “0” when the top field is the bottom field.

  Note that the top field is a field including, for example, 0 line which is the top line (top line) when a screen of 480 lines is counted from 0 to 479.

  The bottom field is a field including 479 lines that are the last line (bottom line).

  Here, the management information file and the stream data file recorded on the optical disc 15 will be described with reference to FIGS. 4 (a) to 4 (b) and FIGS. 5 (a) to 5 (c). FIG. 4 is a diagram showing an example of a recording form of management information and stream data, and FIG. 4A is a diagram showing an example of recording management information and streaming data as the same file. FIG. 4B is a diagram illustrating an example in which management information and stream data are recorded in separate files.

  FIG. 5 is a diagram illustrating an example of a data structure of streaming data according to the present embodiment. FIG. 5A is a diagram illustrating an example of a data structure in GOP units of streaming data according to the present embodiment. FIG. 5B is a diagram illustrating an example of a data structure in each GOP. FIG. 5C shows an example of the data structure in each pack.

  The management information may be added to the AV data as a header and recorded as one file as shown in FIG. 4A, and the management information is stream data as shown in FIG. 4B. Management information and streaming data may be recorded on the optical disc 15 in separate files associated with the relationship that can be referred to.

  In the image conversion apparatus 2 according to the present embodiment, the management information and the streaming data are set to be recorded on the optical disc 15 as separate files as shown in FIG. 4B.

  Next, the internal data structure of the stream data will be described with reference to FIGS. 5 (a) to 5 (c).

  As shown in FIG. 5A, in the present embodiment, stream data is composed of a plurality of GOPs (Group Of Pictures). In addition, in order to enable random access, the GOP periodically inserts a coded screen (intra-coded picture (I-picture)) based on information closed only within the screen, This intra-frame encoded screen has a screen group structure containing at least one frame.

  That is, the GOP is composed of a plurality of frames. In addition to the above-described I-picture, the GOP includes an inter-frame encoded frame (predictive-coded picture: P-picture) and a frame-interpolated encoded frame (bidirectionally predictive-coded picture: B). -Picture) may be included.

  Each GOP is composed of a plurality of video packs and audio packs as shown in FIG. Further, each pack has a structure in which elementary stream (ES) data is stored following a pack header and a packetized elementary stream (PES) packet header, as shown in FIG.

  Note that the MPEG-2 repeat first field (RFF) flag, top field first (TFF) flag, and the like are always present at the beginning of each picture data in the ES data (Picture Header). ) Following a picture coding function extension (Picture Coding Extension).

(Playlist creation process)
Next, playlist creation processing for continuously reproducing a plurality of stream data recorded on the optical disc 15 on the display device 3 will be described with reference to FIGS. FIG. 7 is a diagram illustrating a correspondence relationship between the stream data D created from the plurality of stream data A, B, and C and the stream data A, B, and C.

  FIG. 8 is a diagram showing an example in which a playlist is created from the management information of each stream data A, B, and C. FIG. 9 is a flowchart showing a process of creating information (field phase shift information) indicating the presence / absence of a field phase shift in the connection units 70 and 71.

  FIG. 10 shows the connection units 70 and 71, the reproduction time in the stream data D of the connection units 70 and 71, and the recording position of the GOP reproduced at the end of the reproduction sections A and B immediately before the connection units 70 and 71. It is a figure which shows an example of the table which shows these correspondences.

  Here, as shown in FIG. 7, a case where a playlist for continuously reproducing stream data A, stream data B, and stream data C is created will be described as an example. That is, stream data A, stream data B, and stream data C are recorded on the optical disc 15 in advance. Then, a playlist for continuously reproducing stream data D generated by partially extracting a part of each of the stream data A to C is created. The stream data D includes a section from which the stream data A is extracted (playback section A), a section from which the stream data B is extracted (playback section B), and a section from which the stream data C is extracted (playback section C). ) Are data displayed (reproduced) on the display device 3 in this order.

  Note that each of the playback sections A to C is a section determined by an instruction from the user via the external input unit 32. In the recording / playback apparatus 1 according to the present embodiment, for example, the user determines this section by displaying each video of the stream data A to C on the display device 3 in advance, and the user determines the playback section based on the display result. The structure which determines A-C may be sufficient. Alternatively, when the playback time for specifying the playback sections A to C is known in advance, the playback sections A to C may be determined by inputting the playback time by the external input unit 32. Alternatively, the playback sections A to C may be set in the recording / playback apparatus 1 in advance, and the playback sections A to C may be automatically determined. However, partial extraction of the stream data A to C is performed in GOP units in which the recording / reading device 16 can randomly access the stream data.

  Further, as shown in FIG. 8, the playlist is associated with the management information file A associated with the stream data A, the management information file B associated with the stream data B, and the stream data C. It is created by referring to each management information file C. Note that in the creation of the playlist, the actual stream data A to C are not rewritten or physically moved.

  That is, in the playlist, management information such as a reproduction time length, a recording position, and a data size in GOP units of each section (reproduction sections A to C) necessary for reproduction of the stream data D is stream data A and stream data B, respectively. , And management information A to C corresponding to the stream data C.

  In addition, as shown in FIG. 7, a connection unit 70 is provided between the section extracted from the stream data A (reproduction section A) and the section extracted from the stream B (reproduction section B), and from the stream B. A connection unit 71 is generated between the extracted section (playback section B) and the section extracted from the stream C (playback section C).

  In the connection unit 70 and the connection unit 71, when each of the playback sections A to C is subjected to, for example, 2: 3 pull-down conversion and field-displayed, a field phase shift may occur. Therefore, whether there is a phase shift in the field between the playback section A and the playback section B in the connection unit 70, or whether there is a field phase shift between the playback section B and the playback section C in the connection unit 71. Information about is also recorded in the playlist.

  That is, as shown in FIG. 10, the connection unit 70 and the connection unit 71, the playback time (time) in the stream data D of the connection unit 70 and the connection unit 71, and the playback section A immediately before the connection unit 70 and the connection unit 71 And table information (connection state table) indicating the correspondence with the recording position of the GOP reproduced at the end of each reproduction section B is recorded in the playlist.

  In this connection state table, when a phase shift of the field occurs at the connection portion, it is identified by rewriting the item of presence / absence of the field phase shift from “0” to “1”.

  Also, information indicating the presence / absence of a field phase shift in the connection unit 70 and the connection unit 71 is created using the field phase information shown in FIG. 6 attached to the management information of the stream data A to C. . In addition, the creation process of the information regarding the presence / absence of a field phase shift in the connection unit 70 and the connection unit 71 will be described later.

  Here, the playlist creation processing in the recording / recording apparatus 1 will be described more specifically.

  First, the user transmits a playlist creation instruction to the system controller 11 by the external input unit 32. That is, the external input unit 32 transmits a play list creation instruction to the management information acquisition unit 40 of the system controller 11 together with designation of the playback sections A to C from the stream data A to C, respectively.

  When the management information acquisition unit 40 receives the designation of the reproduction sections A to C and the playlist creation instruction from the external input unit 32, first, the management information A to C corresponding to the stream data A to C is sent to the recording / reading device 16. An instruction is issued from C to read each of the management information A ′ to C ′ of the playback sections A to C. The management information A ′ to C ′ reading instruction from the management information acquisition unit 40 may be configured to issue an instruction to read the playback sections A to C in the order of playback. The configuration may be set in the system controller 11 so that A ′ to C ′ are managed when a playlist is created in the order of reproduction after reading A ′ to C ′ in an appropriate order. As will be described later, when the management information acquisition unit 40 instructs the recording / reading device 16 to read the management information A ′ to C ′, the last of the reproduction sections A to C in the stream data A to C is obtained. An instruction is issued to read management information related to the GOP to be reproduced next to the GOP to be reproduced.

  In response to an instruction from the management information acquisition unit 40, the recording / reading device 16 receives management information A ′ corresponding to the playback section A from management information A, and management information B ′ corresponding to the playback section B from management information B. The management information C ′ corresponding to the playback section C is read from the optical disc 15 from the management information C. Then, the recording / reading device 16 passes the read management information A ′ to C ′ to the management information acquisition unit 40.

  The management information acquisition unit 40 temporarily stores the management information A ′ to C ′ read by the recording / reading device 16 in the RAM 13 and instructs the playlist generation unit 41 to generate a playlist.

  The playlist generation unit 41 edits the management information A ′ to C ′ recorded in the RAM 13 as a playlist for reproducing the stream data D in response to an instruction from the management information acquisition unit 40. On the other hand, the playlist generation unit 41 instructs the phase shift determination unit 49 to determine whether or not a frame phase shift occurs in the connection unit 70 and the connection unit 71.

  In response to this instruction, the phase shift determination unit 49 performs a determination process as to whether or not a phase shift occurs in the connection unit 70 and the connection unit 71. Details regarding this determination processing will be described later.

  The phase shift determination unit 49 passes the determination result as to whether or not the phase shift of the field occurs in the connection unit 70 and the connection unit 71 to the playlist generation unit 41.

  The playlist generation unit 41 records the determination result received from the phase shift determination unit 49 in a playlist created by editing the management information A ′ to C ′, and transmits the result to the playlist transmission unit 42. Note that, as shown in FIG. 10, the determination result as to whether or not the phase shift of this field occurs is the connection unit 70 and the connection unit 71 and the reproduction time (stream time D) of the connection unit 70 and the connection unit 71 ( time) and the recording information of the GOP to be reproduced at the end of each of the playback section A and the playback section B immediately before the connection section 70 and the connection section 71 are recorded in the playlist as table information.

  When the playlist transmission unit 42 receives the playlist created from the playlist generation unit 41, the playlist transmission unit 42 transmits the playlist to the recording / reading device 16, and associates the playlist with the playback sections A to C on the optical disc. 15 to record.

  The recording / reading device 16 records the playlist in the file format on the optical disc 15 in accordance with an instruction from the playlist transmission unit 42.

  As described above, the playlist is created using the management information A ′ to C ′ corresponding to the playback sections A to C and recorded on the optical disc 15.

  By the way, as described above, this playlist includes information indicating whether or not there is a phase shift in the connection units 70 and 71. Here, the creation of information indicating the presence / absence of a phase shift in the connection unit 70 will be described as an example with reference to FIG. FIG. 9 is a flowchart illustrating a process of creating information (field phase shift information) indicating whether or not there is a field phase shift in the connection unit 70.

  First, when creating a playlist, management information of the connection unit 70 of the previous stream data (reproduction section A), that is, management of the GOP to be reproduced at the end of the stream data (reproduction section A) reproduced immediately before the connection unit 70 Information is read (step S1, hereinafter referred to as S1). More specifically, the management information acquisition unit 40 instructs the recording / reading device 16 to read management information A ′ including management information related to the GOP to be played back at the end of the playback section A.

  In addition, the management information acquisition unit 40 instructs to read the management information A ′ including the management information related to the GOP to be played back at the end of the playback section A. The recording / reading device 16 is instructed to read management information related to the GOP (phase determination reference GOP) to be reproduced.

  Upon receiving this instruction, the recording / reading device 16 reads the management information related to the phase determination reference GOP from the optical disc 15 together with the management information A ′, and passes it to the management information acquisition unit 40. Then, the management information acquisition unit 40 temporarily stores the management information of the phase determination reference GOP in the RAM 13 together with the management information A ′ received from the recording / reading device 16.

  Note that the management information regarding the phase determination reference GOP of the connection unit 70 is specified by determining the reproduction time of the reproduction section A from the management information A ′, and can be acquired from the management information A. That is, the phase determination GOP is a GOP in which the playback time comes after the playback time of the playback section A in the stream data A.

  Next, the phase shift determination unit 49 checks the phase of the last field of the playback section A played back immediately before the connection unit 70 (S2).

  That is, the phase shift determination unit 49 determines the management information A ′ and the phase determination temporarily stored in the RAM 13 in response to the determination instruction on the presence or absence of the phase shift in the connection unit 70 from the playlist generation unit 41 as described above. Based on the management information of the GOP, it is determined whether the field displayed at the end of the GOP to be reproduced last in the reproduction section A is the top field or the bottom field.

  That is, the phase shift determination unit 49 refers to the phase determination reference GOP in the connection unit 70 and confirms the first field display of this GOP. As a result, if it is the top field, the GOP reproduced last in the reproduction section A In the case where the last field display of the GOP is the bottom field and conversely the bottom field, it can be confirmed that the last field display of the GOP reproduced last in the reproduction section A is the top field.

  Next, the phase shift determination unit 49 reads management information of the GOP reproduced first in the stream data (reproduction section B) reproduced next in the connection unit 70 from the management information B ′ stored in the RAM 13 ( S3).

  Then, the phase shift determination unit 49 checks the field phase displayed at the beginning of the stream data (reproduction section B) reproduced following the connection unit 70 based on the read management information (S4). That is, the field phase of the playback section B can be found by examining the first displayed field.

  That is, the phase shift determination unit 41 is displayed at the beginning of the GOP reproduced at the beginning of the reproduction section B based on the field phase information recorded in the management information B ′ of the reproduction section B temporarily stored in the RAM 13. Check whether the field to be read is the top field or the bottom field.

  In this way, the field displayed at the end of the GOP reproduced before the connection unit 70 (GOP reproduced at the end of the reproduction section A) and the GOP reproduced after the connection unit 70 (reproduction) Information about whether the first displayed field of the GOP that is reproduced first in the section B is the top field or the bottom field is obtained.

  Next, the phase shift determination unit 49 determines whether or not a phase shift occurs in each connection unit 70 (S5).

  That is, the field displayed at the end of the GOP reproduced immediately before the connection unit 70 obtained for each connection unit 70 and the field displayed at the beginning of the GOP reproduced immediately after the connection unit 70 are compared. To do. As a result of this comparison, if both are the top field or the bottom field, it is determined that a field phase shift occurs in the connection unit 70 (“Yes” in S5).

  As a result of this comparison, when one is the top field and the other is the bottom field, the phase shift determination unit 49 determines that there is no field phase shift in the connection unit 70 ("No" in S5). ). Then, the phase shift determination unit 49 transmits a determination result related to this phase shift to the playlist generation unit 41.

  In the case of “No” in step S5, the playlist generating unit 41 sets “0” to the item of presence / absence of field phase shift in the connection state table shown in FIG. 10 in the playlist created from the management information A ′ to C ′. Add the recorded information as it is.

  On the other hand, in the case of “Yes” in step S5, the playlist generating unit 41 sets the item of presence / absence of a field phase shift in the connection state table shown in FIG. 10 as identification information indicating that a field phase shift occurs. The data is rewritten from 0 to the flag “1”, recorded, and added to the playlist created from the management information A ′ to C ′ (S6).

  That is, as shown in FIG. 10, the playlist generation unit 40 is displayed at the end of this identification information, the playback time of the connection units 70 and 71, and the playback section played before each of the connection units 70 and 71. Information on the recording position of the GOP is recorded in the playlist in association with each of the connection units 70 and 71. Then, the playlist generation unit 40 completes the creation of the playlist (end).

  Since the connection portion 71 can be checked for the presence or absence of a phase shift in the field in the same manner as the process for creating the field phase shift information described above, the description thereof will be omitted.

(Stream data playback processing using playlists)
Next, processing for reproducing the stream data D using the above-described playlist will be described with reference to FIG. FIG. 11 is a flowchart illustrating an example of the reproduction process of the stream data D.

  First, when reproduction of stream data is instructed by the user from the external input unit 32, the system controller 11 refers to the ROM 12 and / or the RAM 13 and sends a stream data file (reproduction target) to the recording / reading device 16. File).

  That is, the file reading instructing unit 48 of the system controller 11 first instructs the recording / reading device 16 to read information on the reproduction target file from the optical disc 15 in accordance with a user instruction from the external input unit 32.

  The information related to the reproduction target file is information for identifying whether the reproduction target file is a stream data file or a playlist file created to continuously reproduce a plurality of stream data.

  This information is described in the management information file corresponding to the stream data when the reproduction target file is a stream data file. Therefore, the recording / reading device 16 reads the management information file corresponding to the stream data when the reproduction target file is stream data, and reads the playlist file when the file is a playlist.

  In response to an instruction from the file reading instruction unit 48, the recording / reading device 16 reads information related to the reproduction target file from the optical disk 15. The recording / reading device 16 transmits information related to the read reproduction target file to the read file information acquisition unit 45. Then, when the read file information acquisition unit 45 acquires information about the reproduction target file, the read file information acquisition unit 45 transmits the acquired information to the read file determination unit 46.

  The read file determination unit 46 determines whether the reproduction target file is stream data or a playlist based on the information regarding the reproduction target file received from the read file information acquisition unit 45 (S7). When the read file determination unit 46 determines that the reproduction target file is stream data (“No” in S7), the determination result is transmitted to the file read instruction unit 48.

  The file reading instructing unit 48 instructs the recording / reading device 16 to read stream data as a reproduction target file from the optical disc 15 according to the determination result of the read file determining unit 46. In response to an instruction from the file reading instruction unit 48, the recording / reading device 16 reads the stream data from the optical disc 15 and transmits the read stream data to the system decoder 18 via the reproduction stream buffer 17.

  Then, the system decoder 18 demultiplexes the received stream data into encoded video data and encoded audio data and performs a decoding process (S11). The system decoder 18 transmits the encoded video data to the switch 19, while transmitting the encoded audio data to the audio buffer 24. The switch 19 transmits the encoded video data to the video buffer 22 as it is because the reproduction target file is stream data.

  The video buffer 22 buffers the encoded data of the video transmitted from the switch 19 and transmits it to the video decoder 23. The audio buffer 24 buffers the audio encoded data transmitted from the system decoder 18 and transmits the buffered audio data to the audio decoder 25. The video decoder 23 decodes the encoded data of the video input via the video buffer 22 and outputs the decoded data to the display device 3 as an AV (video) signal. The audio decoder 25 decodes the encoded audio data input via the audio buffer 24 and outputs the decoded data to the display device 3 as an AV (audio) signal (end).

  On the other hand, when the read file determination unit 46 determines that the file to be reproduced is a playlist (“Yes” in S7), the read file determination unit 46 displays the determination result along with the read playlist as a playlist recognition unit 47. Send to.

  When receiving the playlist from the read file determining unit 46, the playlist recognizing unit 47 determines whether it is necessary to adjust the field phase in the stream data connecting units 70 and 71 (S8). That is, as described above, the playlist includes identification information as to whether or not the phase of the field associated with the positions of the connection units 70 and 71 is shifted. Therefore, when the playlist recognition unit 47 reads this information, the phase of the field is changed in the connection section 70 between the playback section A and the playback section B that are continuously played back or in the connection section 71 between the playback section B and the playback section C. It is possible to check whether or not a deviation occurs and determine whether or not the field phase needs to be adjusted.

  When the playlist recognizing unit 47 determines that it is not necessary to adjust the phase of the field in the stream data connecting units 70 and 71 (“No” in S8), the playlist recognizing unit 47 refers to this playlist and continuously reproduces the stream data, That is, information for each GOP regarding each data in the reproduction sections A to C is transmitted to the file reading instruction unit 48. Then, based on the playlist information transmitted from the playlist recognition unit 47, the file reading instruction unit 48 instructs the recording / reading device 16 to read the data in the reproduction sections A to C in the order of reproduction. put out.

  In response to an instruction from the file reading instruction unit 48, the recording / reading device 16 sequentially reads the stream data of the playback section A, playback section B, and playback section C from the optical disc 15 in units of GOP, and reads the playback stream buffer 17 To the system decoder 18.

  The system decoder 18 demultiplexes the data of the playback sections A to C, transmits the encoded audio data to the audio buffer 24, and transmits the encoded video data to the switch 19. Since the switch 19 is not instructed to switch the play list recognition unit 47 to transmit data to the data analysis unit 20, the switch 19 transmits the received data to the video buffer 22.

  When the playlist recognizing unit 47 determines that the phase adjustment of the field is necessary in the connection unit 70 or the connection unit 71 of the stream data (“Yes” in S8), the playback section A or the playback is performed with respect to the switch 19. A destination switching instruction is issued so that the encoded data of the last GOP in section B is transmitted to the analysis unit 20. On the other hand, the playlist recognition unit 47 refers to the playlist and transmits information for each GOP regarding each data in the reproduction sections A to C to the file reading instruction unit 48. The file reading instruction unit 48 instructs the recording / reading device 16 to read the data in the reproduction sections A to C based on the information for each GOP regarding the data in the reproduction sections A to C.

  That is, in response to an instruction from the file reading instruction unit 48, the recording / reading device 16 reads the reproduction sections A to C in the order of reproduction from the optical disk 15 for each GOP. Then, the system decoder 18 demultiplexes the read data for each GOP in the reproduction sections A to C, and transmits the encoded video data to the switch 19.

  When the encoded data of the GOP portion reproduced last in the reproduction section A or the reproduction section B is input from the system decoder 18, the switch 19 sends this data to the data analysis section 20 in accordance with an instruction from the playlist recognition section 47. Transmit encoded video data.

  Note that the timing of the instruction from the playlist recognition unit 47 to the switch 19 is determined based on management information for each GOP included in the playlist by the playlist recognition unit 47.

  More specifically, the playlist recognizing unit 47 determines the timing of the destination switching instruction to the switch 19 from the playback time of the GOP that is played back last in the playback section A or playback section B included in the playlist. be able to.

  When the data analysis unit 20 receives the encoded data via the switch 19, the data analysis unit 20 analyzes the header portion of the picture displayed last in the data (S9).

  That is, the data analysis unit 20 analyzes the MPEG2 picture encoding function extension unit (picture_coding_extension) in the header portion, thereby information on the value of the RFF flag in the picture encoding function extension unit (picture_coding_extension). Is identified. Then, the data rewriting unit 21 rewrites the value of the RFF flag specified by the data analysis unit 20 so as to be inverted (S10). In this way, by rewriting the RFF flag by the data rewriting unit 21, it is possible to adjust the phase shift of the field occurring in the connection unit 70 or the connection unit 71.

For example, as shown in FIG. 12, there is a phase shift in the field when the 2: 3 pull-down display is performed between the GOP reproduced at the end of the reproduction section A and the GOP reproduced at the beginning of the reproduction section B. Suppose it has occurred. That is, the field display corresponding to the last frame P ₈ of the GOP to be reproduced last in the reproduction section A is set to t (top field) · b (bottom field). Further, the first field B ₀ of the GOP reproduced at the beginning of the reproduction section B is b (bottom field) · t (top field). Therefore, in the connection unit 70, the field is b (bottom field) -b (bottom field), and the phase of the field is shifted.

Here, Invert the last value of the flag of the RFF defining the structure of the last field portion of the GOP to be reproduced playback section A, field display corresponding to the frame P ₈ is t (top field) · b (Bottom field) is converted to t (top field) · b (bottom field) · t (top field).

  As a result of this conversion, the field display at the connection unit 70 becomes t (top field) -b (bottom field), and the phase shift of the field is interpolated. Therefore, the phase of the field of the connection unit 70 can be adjusted only by inverting the value of the RFF flag by the data rewriting unit 21. Similarly, with respect to the connection unit 71, the phase generated in the connection unit 71 is reversed by inverting the RFF flag value that defines the structure of the last field portion of the GOP reproduced at the end of the reproduction section B. The deviation is adjusted.

  The data rewriting unit 21 inverts the value of the RFF flag, so that the field display of the frame displayed at the end of the GOP immediately before the connection unit 70 or 71 is irregular. That is, the stream data (playback section A or playback section B) displayed in 2 frames and 5 fields becomes 2 frames 4 fields or 2 frames 6 fields immediately before the connection section 70 or the connection section 71. There is.

  However, since the connection section 70 or the connection section 71 is switched from the playback section A to the playback section B movie or from the playback section B to the playback section C movie, a viewer who watches the movie by this irregular field display. There is no sense of incongruity.

  That is, in the image conversion apparatus 2 according to the present embodiment, when the playback section A, the playback section B, and the playback section C are continuously played back, the field adjustment is performed immediately before the connection section 70 or the connection section 71. Only. That is, only the last frame of the GOP reproduced at the end of the reproduction section A or the last frame of the GOP reproduced at the end of the reproduction section B is subjected to the field display period adjustment, and the other frames are It is not changed during playback. For this reason, there is no influence such as an uncomfortable feeling in the motion of the moving image during continuous playback of the playback section A, the playback section B, and the playback section C.

  When the data rewriting unit 21 inverts the value of the RFF flag and rewrites the RFF code, the encoded data of the video with the rewritten RFF flag value is transmitted to the video decoder 23 via the video buffer 22 (S11). Since the subsequent processing has been described above, it will be omitted.

  As described above, when the image conversion apparatus 2 of the recording / reproducing apparatus 1 according to the present embodiment records the stream data of moving image data captured by the imaging apparatus 4 on the optical disc 15, the management information file related to the stream data is recorded. It is the structure which creates. The management information file includes the creation date and time of the stream data file, the codec used for the stream data, the total playback time length of the stream data, the playback time length in GOP units, the recording position on the optical disk 15 in GOP units, and in GOP units. In addition to the information such as the data size, information regarding the phase state of the field when the field is displayed by 2: 3 pull-down conversion is included.

  Further, the image conversion device 2 is configured to be able to create a playlist based on a management information file of each stream data when continuously reproducing a plurality of stream data. This playlist includes not only information necessary for continuously reproducing a plurality of stream data but also information regarding whether or not a phase shift of a field occurs at a connection portion between different stream data.

  The image conversion apparatus 2 is configured such that the playlist recognition unit 47 can determine whether or not it is necessary to adjust the phase of the field in the connection unit 70 or the connection unit 71 based on the playlist. Further, when it is necessary to adjust the phase of the field, the data rewriting unit 21 inverts the value of the RFF code specified by the data analysis unit 20 so that the phase shift of the field can be interpolated. .

  Therefore, the image conversion apparatus 2 according to the present embodiment does not need to be provided with an editable point in advance when encoding the captured moving image data, and does not require an editable point in advance. The phase of the field can be adjusted only by analyzing and rewriting the GOP) of the stream data reproduced immediately before the unit 71.

  In other words, the moving image data can be freely edited during reproduction by simply analyzing the data of the necessary portion, and continuous reproduction can be realized. In addition, the image conversion apparatus 2 can interpolate field phase shifts that occur in continuous reproduction of a plurality of different stream data before sending encoded video data to the video decoder 23. Therefore, it is not necessary to provide the video decoder 23 with a function for interpolating the phase shift of the field, and any video decoder 23 can be used as long as it can decode the encoded video data. Playback is obtained.

  Note that the image conversion apparatus 2 according to the present embodiment is configured to record the connection state table shown in FIG. 10 in the playlist during the playlist creation process. The connection state table includes the connection unit 70 and the connection unit 71, the playback time (time) of the connection unit 70 and the connection unit 71 in the stream data D, and the playback section immediately before the connection unit 70 and the connection unit 71. The table information indicates the correspondence with the recording position of the GOP reproduced at the end of each of A and the reproduction section B. However, the items recorded in the connection state table are not limited to this, and instead of the recording position of the GOP reproduced at the end of each of the reproduction section A and the reproduction section B immediately before the connection section 70 and the connection section 71. Alternatively, it may be the recording position of the frame displayed at the end of the GOP to be played back last in each of the playback section A and the playback section B immediately before the connecting section 70 and the connecting section 71.

  In this case, in the stream data reproduction process using the playlist, the playlist recognition unit 47 can easily check whether there is a phase shift in the connection unit 70 and the connection unit 71, and further the data analysis unit 20. Therefore, the RFF code for the last frame of the GOP immediately before the connection unit 70 or the connection unit 71 can be specified smoothly.

  Further, in the image conversion apparatus 2 according to the present embodiment, as shown in FIG. 6 in the management information, for each GOP of stream data, the top display field of the top frame of this GOP is the top field or the bottom field. It is configured to record field phase information for identifying whether there is any. Then, when the phase shift determination unit 49 determines whether or not a field phase shift occurs in the connection unit 70 and the connection unit 71, the field phase information and the stream data immediately before the connection unit 70 and the connection unit 71 are determined. In other words, in the playback section A and the playback section B, the determination is made by comparing the state of the field displayed at the end of the last frame of the GOP that is played back last. The confirmation of the state of the field displayed at the end of the last frame of the GOP reproduced last in the reproduction section A and the reproduction section B is performed by checking the GOP to be displayed next to the reproduction section A in the stream data A. The configuration is realized by confirming the field phase information of (phase determination reference GOP).

  However, the method for confirming the phase of the field displayed at the end of the last frame of the GOP displayed last in playback section A and playback section B is not limited to this.

  That is, in the management information, in addition to the field phase information of the first frame of the GOP, information regarding the display format of the field display by the pull-down method may be recorded.

  In other words, in the pull-down method, in addition to 2: 3 pull-down for converting a video of 24 frames per second into a video of 60 fields per second, 3: 2 pull-down, 2: 3: 3: 2 pull-down, 3: 2: 2 : 3 pull-down method may be used. That is, one of these pull-down methods is employed to convert a video of 24 frames per second into a video of 60 fields per second.

  Therefore, by recording these pull-down methods for each GOP on the basis of the first frame in each GOP, the field displayed at the end of the last frame in each GOP is the top field or the bottom field. Whether it is a field can be specified.

  As a display format of the field display by the pull-down method, for example, when the field display period from the first frame of each GOP continues as 2, 3, 2, 3, 2, 3. , 3, 2, 3, 2..., “1”, and 2, 3, 3, 2, 2, 3, 3, 2. , 3, 2, 2, 3... Can be realized by recording “3”.

  In the management information, as shown in FIG. 13, a table indicating the correspondence between GOP, field phase information, and this display format is recorded.

  Here, in the case where a table as shown in FIG. 13 is recorded in the management information, information creation processing regarding whether or not a phase shift occurs in the connection unit 70 will be described with reference to FIG. FIG. 14 is a flowchart showing a process of creating information (field phase shift information) indicating the presence or absence of a field phase shift in the connection unit 70.

  The creation of the field phase shift information is performed during the playlist creation process, similar to the creation of the field phase shift information.

  First, management information relating to the GOP to be reproduced at the end of the stream data (reproduction section A) reproduced immediately before the connection unit 70 is read into the RAM 13 (S12).

  That is, the management information acquisition unit 40 instructs the recording / reading device 16 to read the management information A ′ corresponding to the reproduction section A, and temporarily stores the obtained management information A ′ in the RAM 13.

  Next, the phase shift determination unit 49 displays the last frame displayed in the playback section A immediately before the connection section 70, that is, the last frame displayed in the last GOP of the playback section A. The frame number (frame number) from the first frame is calculated (S13).

  Then, the phase shift determination unit 49 refers to the management information A ′ and the calculated frame number, and checks the phase of the last field in the playback section A (S14). That is, the phase shift determination unit 49 displays the field displayed at the beginning of the first frame of the GOP at the end of the playback section A, the field display format by the pull-down method, the calculated frame number displayed last. Based on the above, it is checked whether the last field of the playback section A reproduced immediately before the connection unit 70 is a top field or a bottom field.

  For example, in the management information A ′, in the last GOP of the playback section A, the phase state of the field of the frame displayed first is “1” (top field), and the field display format of this GOP is “2” ( 2, 3, 3, 2... Assume that the calculated frame number of the last displayed frame is 3. In this case, the last field in the playback section is a bottom field.

  Next, the phase shift determination unit 49 reads management information of the GOP reproduced first in the stream data (reproduction section B) reproduced next in the connection unit 70 from the management information B ′ stored in the RAM 13 ( S15). The management information can be specified from the playback time in the playback section B with reference to the management information B ′.

  Then, the phase shift determination unit 49 checks the field phase displayed at the beginning of the GOP reproduced at the beginning of the stream data (reproduction section B) reproduced subsequently at the connection unit 70 (S16).

  That is, based on the management information B ′ of the playback section B temporarily stored in the RAM 13, the phase shift determination unit 49 determines whether the field displayed at the beginning of the GOP that is played back first in the playback section B is the top field. Or if it is a bottom field.

  In this way, the field display of the last field displayed in the GOP played before the connection unit 70 (the GOP played at the end of the playback section A) and the playback after the connection unit 70 are played back. The field display of the field displayed first in the GOP (GOP reproduced first in the reproduction section B) is obtained.

  Next, the phase shift determination unit 49 determines whether or not a phase shift occurs in each of the connection units 70 and 71 (S17).

  That is, the phase shift determination unit 49 obtains the last field display of the GOP reproduced before the connection unit and the first field display of the GOP reproduced after the connection unit obtained for each of the connection units 70 and 71. Compare As a result of this comparison, if both are the top field or the bottom field, it is determined that a field phase shift occurs ("Yes" in S17). As a result of the comparison, if one is the top field and the other is the bottom field, the phase shift determination unit 49 determines that there is no field phase shift (“No” in S17).

  Then, the phase shift determination unit 49 transmits a determination result related to this phase shift to the playlist generation unit 41.

  In the case of “No” in step S17, the playlist generating unit 41 sets “0” to the item of presence / absence of field phase shift in the connection state table shown in FIG. 10 in the playlist created from the management information A ′ to C ′. Add the recorded information as it is.

  On the other hand, in the case of “Yes” in step S17, the playlist generation unit 40 sets the item of presence / absence of field phase shift in the connection state table shown in FIG. 10 as identification information indicating that a field phase shift occurs. The data is rewritten from “0” to “1” and recorded, and added to the playlist created from the management information A ′ to C ′ (S18).

  That is, as shown in FIG. 10, the playlist generation unit 40 includes the identification information, the playback time of the connection unit 70, and the recording position of the GOP displayed at the end of the playback section played before the connection unit 70. Information is recorded in the playlist in association with each connection unit 70. Then, the playlist generation unit 40 completes the creation of the playlist (end).

  Since the connection portion 71 can be checked for the presence or absence of a phase shift in the field in the same manner as the process for creating the field phase shift information described above, the description thereof will be omitted.

  As described above, by further recording the display format of the field in the pull-down method in the management information A to C in advance for each GOP, in the image conversion apparatus 2 according to the present embodiment, the phase shift determination unit 49 is connected to the connection information. In order to check the phase of the field reproduced immediately before the sections 70 and 71, it is not necessary to analyze the phase determination reference GOP. That is, the phase shift determination unit 49 does not need to refer to the management information regarding the data other than the reproduction sections A and B in the stream data A and B, and only connects the management information A ′ and B ′ regarding the reproduction sections A and B. It is possible to determine the phase shift at 70/71.

  Therefore, the phase shift determination unit 49 can determine the presence / absence of a phase shift in the connection units 70 and 71 by simpler analysis processing on the stream data A to C. Further, in stream data A or stream data B, when there is no stream data following playback section A or playback section B, for example, the end of playback section A or playback section B is the end of stream data A or stream data B. Even in this case, the phase shift determination unit 49 can determine whether there is a field phase shift in the connection unit 70 or the connection unit 71.

  That is, the image conversion apparatus 2 according to the present embodiment reproduces the stream data A or the stream data B in order to specify the field display of the field displayed at the end of the frame immediately before the connection unit 70 or the connection unit 71. There is no need to read “GOP (phase determination reference GOP) to be reproduced next” ”in section A or reproduction section B.

  For this reason, when the GOP (phase determination reference GOP) reproduced next to the reproduction section A does not exist in the stream data A, or the GOP (phase determination reference GOP) to be reproduced next to the reproduction section B is the stream data B. Even if it does not exist, the display of the field displayed immediately before the connection unit 70 can be specified.

  By the way, when a plurality of stream data are continuously played back, the end of the previous stream does not necessarily have to be the end of the GOP, but it is cut after any P picture in the middle of the GOP and the next GOP By connecting to the head of the frame, there is no influence of MPEG inter-frame prediction, and editing can be performed without re-encoding. As a result, the degree of freedom for editing a plurality of stream data can be increased.

  Even when such editing is performed, the image editing apparatus 2 further records the display format of the field in the pull-down method for each GOP in the management information A to C in advance, so that an arbitrary one in the GOP can be recorded. Since the field state in the frame number can be confirmed, it is possible to determine whether or not there is a field phase shift in the connection unit 70 or the connection unit 71.

  The image conversion device 2 of the recording / reproducing device 1 according to the present embodiment is configured to display moving image data recorded at a frame rate of 24 Hz on the display device 3 in an interlaced manner at a field rate of 60 Hz. It is not a thing. That is, the image conversion apparatus 2 according to the present embodiment can interpolate and adjust the phase shift of the field if the frame rate of the recorded moving image data is converted and displayed at the field rate.

  In addition, the image conversion device 2 corrects a phase shift if a field phase shift occurs even when moving image data having a frame rate of 24 Hz and moving image data having a field rate of 60 Hz are continuously reproduced. Can be adjusted by interpolation.

  Further, the image conversion apparatus 2 of the recording / reproducing apparatus 1 according to the present embodiment encodes the moving image data captured by the imaging apparatus 4 using the MPEG2 system, but is not limited to the MPEG2 system. That is, it is an encoding method in which the frame rate of the captured moving image data is converted so that it can be displayed at an appropriate field rate on the display device 3 and the code for converting the frame into the field display can be recorded at the time of encoding. Any encoding method may be used for moving images.

  Further, the recording / reproducing apparatus 1 according to the present embodiment is configured to continuously reproduce the reproduction section A, the reproduction section B, and the reproduction section C extracted from the stream data A, the stream data B, and the stream data C, respectively. However, the number of stream data or stream data to be continuously reproduced is not limited to this. That is, the recording / reproducing apparatus 1 can also extract a plurality of portions as reproduction targets from the same stream data and continuously reproduce them.

  As described above, it can be said that the video data reproducing apparatus according to the present invention has the following configuration.

  The video data playback apparatus according to the present invention collects a plurality of frames of recorded video data in time series to form a frame group during playback, and converts each frame of each frame group from the frame to a field. A video data reproducing apparatus for converting to two or more fields based on a phase rule for selecting, selecting and replaying an arbitrary frame group, and before converting the frame into a field, When the phase determination unit that determines whether or not the phase of the field of the adjacent frame is the same, and the phase determination unit determine that the phase of the field is different, the phase of the field of the preceding frame group is A phase rule changing unit for changing the phase rule so as to be the same as the phase of the field of the frame group.

  The frame group is, for example, a GOP that is a video data unit that can be randomly accessed in recorded video data.

  A frame is a unit constituting each video in the video data, and one video in the video data is one frame. For example, when converting video data such as a movie recorded at 24 frames per second (frame rate 24 Hz) to 30 frames per second (field rate 60 Hz) and displaying the frames, the field is divided into even lines or odd lines. When the display screen of 480 lines is counted from 0 to 479, the top field including the 0th line that is the first line and the bottom field that is the field including the 479th line that is the last line. It is divided into two and displayed.

  Each field per frame is displayed by periodically repeating a field divided into two, that is, a top field and a bottom field, and the phase of the field is the top field and the bottom field. It is a periodic change of the field formed by the circulation of. Therefore, the fact that the phase of the field is different means that the periodicity of these fields is different.

  The phase rule can be realized by, for example, an MPEG-2 RFF code.

  Since the video data reproducing apparatus includes phase determining means, when each frame of any of the above frame groups of video data is converted into a field and continuously reproduced, the field of each frame between adjacent frame groups is It can be confirmed whether or not the phases are the same.

  In addition, since the video data reproducing device includes the phase rule changing unit, when continuously reproducing a plurality of frame groups, the phase of the field of the preceding frame group in the adjacent frame group is the same as that of the subsequent frame group. If they are different from the phase of the field, the phase of both fields can be made the same by changing the phase rule.

  That is, the video data playback apparatus according to the present invention, when continuously playing back video data that has been arbitrarily fetched, causes a phase shift between fields of the frames that are generated by converting any continuous frames into a field. Can be supplemented to have the same phase.

  Therefore, the video data playback apparatus according to the present invention does not need to set the editing position of the video data at the time of recording in advance even when the frame rate is changed at the time of playback of the video data. Make the data editable.

  Further, in the video reproduction device according to the present invention, in the above configuration, the phase of the field is determined by a combination of two types of fields having different polarities, and the phase rule changing unit has the phase of the field different from each other. If determined, the field polarity displayed at the end of the last frame of the preceding frame group is different from the field polarity displayed at the beginning of the first frame of the succeeding frame group adjacent to the field polarity. The phase rule may be changed.

  Note that the combination of two types of fields having different polarities means that the position displayed by a field is, for example, a field that is an even line display when displaying an image based on video data with a plurality of lines and an odd line display. It is a combination of a certain field, that is, a top field and a bottom field.

  In the video reproduction device according to the present invention, when the phase rule changing unit determines that the phase of the field is different, the last field polarity of the last frame of the preceding frame group is adjacent to the field polarity. The first field polarity of the first frame of the subsequent frame group can be changed to be different.

  Therefore, in a plurality of frames that are continuously reproduced, even if the polarities of the fields adjacent to each other are the same, and the periodic change in the field polarity is impaired, Since the last field polarity of the last frame of the group of frames can be changed, periodic changes in the field polarity can be corrected.

  For this reason, in the video playback device according to the present invention, when each frame of an arbitrary frame group is changed to a field and continuously played, the periodic change of the polarity of the field is maintained and the arbitrary frame group is continuously played. Can be played.

  Therefore, the video data playback apparatus according to the present invention does not need to set the editing position of the video data at the time of recording in advance even when the frame rate is changed at the time of playback of the video data. Make the data editable.

  The video playback apparatus according to the present invention, in the configuration described above, is based on the frame length, the field polarity pattern, and the field polarity displayed at the beginning of the first frame in each frame group. Field polarity determining means for determining the field polarity displayed at the end of the tail frame is provided.

  The frame length is expressed by the number of frames constituting each frame group, and the field polarity pattern is a periodic change in the field polarity when each frame is converted into a field in the frame group. It is a pattern.

The field polarity judging means determines the field displayed at the end of the last frame of the frame group based on the frame length of the frame group, the field polarity pattern and the field polarity of the field displayed first. Field polarity can be determined. For this reason, it is possible to determine the field polarity of the adjacent fields in the continuously reproduced frame groups from the configuration of the frame groups of the recorded video data.

  Therefore, the video playback apparatus according to the present invention does not need to set the editing position of the video data at the time of recording in advance even when the frame rate is changed at the time of playback of the video data. Can be edited.

  In order to solve the above problems, the video data playback apparatus control method according to the present invention forms a frame group by collecting a plurality of frames of recorded video data in time series at the time of playback. Is a method for controlling a video data reproducing apparatus for converting an arbitrary frame group into two or more fields based on a phase rule for converting the frame into a field, selecting an arbitrary frame group, and continuously reproducing the selected frame group. If it is determined that the phase of the field of adjacent frames in any frame group is the same before the conversion from field to field, and the phase of the field is different, the previous frame group The phase rule change step for changing the above phase rule so that the phase of the next field is the same as the phase of the field of the subsequent frame group. Characterized in that and a flop.

  A video data playback apparatus control program according to the present invention is a video data playback apparatus control program for causing a computer to implement the above-described units included in the video data playback apparatus in order to solve the above problems.

  A recording medium according to the present invention is a computer-readable recording medium on which a control program for the video data reproducing apparatus is recorded.

  That is, the video playback device may be realized by a computer. In this case, a control program for causing the video playback device to be realized by the computer by operating the computer as each of the means, and the control program are recorded. Such computer-readable recording media also fall within the scope of the present invention.

  The image conversion apparatus 2 of the recording / reproducing apparatus 1 according to the present embodiment creates a playlist based on the management information of the stream data recorded on the optical disc 15, and fields a plurality of stream data based on the information of the playlist. It is the structure which can reproduce | regenerate continuously, without shifting the phase. For this reason, even when stream data is not subjected to special processing for continuously reproducing a plurality of video data at the time of encoding moving image data, the stream data is extracted in a free section and consists of a plurality of stream data. Another stream data can be edited.

It is a block diagram which shows an example of a principal part structure of the system controller of the image conversion apparatus which concerns on this embodiment. It is a block diagram which shows an example of the principal part structure of the recording / reproducing apparatus which concerns on this Embodiment. It is a block diagram which shows an example of a principal part structure of the image conversion apparatus which concerns on this embodiment. FIG. 6A is a diagram illustrating an example of a recording form of management information and stream data, and FIG. 5A is a diagram illustrating an example in which management information and streaming data are recorded as the same file. FIG. 5B is a diagram showing an example in which management information and stream data are recorded in separate files. It is a figure which shows an example of the data structure of the streaming data which concerns on this Embodiment. FIG. 6A shows an example of the data structure of streaming data according to this embodiment in GOP units. FIG. 5B shows an example of the data structure in each GOP. FIG. 4C is a diagram showing an example of the data structure in each pack. It is a figure which shows the correspondence of each GOP of stream data, and the phase information of the display field of the head frame in the said GOP. It is a figure which shows the correspondence of the stream data D produced from several stream data A, B, and C, and each stream data A, B, and C. FIG. It is a figure which shows an example with which a play list is produced from each management information of each stream data A, B, and C. It is a flowchart which shows an example of the process which produces the information (field phase shift information) which shows the presence or absence of the field phase shift | offset | difference in a connection part. It is a figure which shows an example of the table which shows the correspondence of the connection part, the reproduction time in the stream data D of this connection part, and the recording position of GOP reproduced | regenerated at the end of the reproduction area immediately before a connection part. 10 is a flowchart illustrating an example of a reproduction process of stream data D. It is a figure which shows an example of the correspondence of the display image at the time of the continuous reproduction of the reproduction area A and the reproduction area B, and the pull-down display in which the phase shift of the field was complemented. It is a figure which shows an example of the table which shows the correspondence of GOP, field phase information, and the display format of the field by a pull-down system. It is a flowchart which shows an example of another process which produces the information which shows the presence or absence of the shift | offset | difference of the field phase in a connection part. It is a figure which shows the correspondence of the frame display of recording data and a display image, the pull-down display of a display image, a TFF flag, and an RFF flag. It is a figure which shows the frame structure for every GOP, and the field structure of the frame, and shows an example in case the coding data comprised from GOP1, GOP2, and GOP3 is edited so that it may comprise GOP1 and GOP3 FIG.

Explanation of symbols

2 Image conversion device (video data playback device)
11 System controller 12 ROM (recording medium)
13 RAM
19 Switch 20 Data analysis part 21 Data rewriting part (Phase rule changing part)
41 playlist generation unit 47 playlist recognition unit 49 phase shift determination unit (phase determination means)
70 connections 71 connections

Claims (7)

A recording / reproducing apparatus that continuously reproduces a combination of first stream data that is data generated by compressing an input moving image and second stream data that is stream data generated from another moving image. And
Whether the field of the frame displayed at the head of the first stream data and the second stream data is a top field when the first stream data and the second stream data are generated and recorded on a recording medium, respectively. Management information generating means for generating management information including field phase information for identifying whether the field is a bottom field;
Playlist information generating means for generating playlist information, which is information necessary for continuously reproducing the first stream data and the second stream data, based on the management information generated by the management information generating means; ,
Check whether the field displayed at the end of the last frame in the first stream data is a top field or a bottom field, and refer to the field phase information included in the management information to determine the first stream. Phase determining means for determining whether or not the fields of adjacent frames of the data and the second stream data have the same phase;
Recording means for recording the playlist information generated by the playlist information generating means in a recording medium in association with each of the first stream data and the second stream data,
The recording / reproducing apparatus characterized in that the playlist information generating means creates the playlist information by including the determination result by the phase determining means. Based on the determination result by the phase determination unit included in the playlist information recorded on the recording medium, the adjacent first frame data and second stream data associated with the playlist information Playlist confirmation means for confirming whether the phase of the field is the same, and
Reading means for reading out the first stream data and the second stream data associated with the playlist information from the recording medium according to the playlist information confirmed by the playlist confirmation means;
A phase rule changing unit that adjusts the phase of the field when the playlist confirmation unit confirms the phase shift of the field between adjacent frames of the first stream data and the second stream data; The recording / reproducing apparatus according to claim 1, comprising:   The management information generating means creates the field phase information for each GOP, which is a randomly accessible unit composed of a plurality of frames, in each of the first stream data and the second stream data. Item 3. The recording / reproducing apparatus according to Item 1 or 2.   The management information generating means records each of the first stream data and the second stream data including information on a display format of a field display by a pull-down method for each GOP in the management information. The recording / reproducing apparatus according to claim 3. Control of recording / reproducing apparatus for continuously reproducing first stream data which is data generated by compressing input moving image and second stream data which is stream data generated from other moving images A method,
Whether the field of the frame displayed at the head of the first stream data and the second stream data is a top field when the first stream data and the second stream data are generated and recorded on a recording medium, respectively. A management information generating step for generating management information including field phase information for identifying whether the field is a bottom field;
A playlist information generation step for generating playlist information, which is information necessary for continuously reproducing the first stream data and the second stream data, based on the management information generated in the management information generation step; ,
Check whether the field displayed at the end of the last frame in the first stream data is a top field or a bottom field, and refer to the field phase information included in the management information to determine the first stream. A phase determination step for determining whether or not the fields of adjacent frames of the data and the second stream data have the same phase;
Recording the playlist information generated in the playlist information generating step in a recording medium in association with the first stream data and the second stream data,
In the playlist information generation step, the determination result in the phase determination step is created by including the determination result in the playlist information.   5. A recording / reproducing apparatus control program for causing a computer to function as each unit of the recording / reproducing apparatus according to claim 1.   A computer-readable recording medium on which the control program for the recording / reproducing apparatus according to claim 6 is recorded.

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