JP2010016748A - Recording apparatus and recording method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To transmit all video data to a server even if transmission is interrupted. <P>SOLUTION: The present invention relates to a recording apparatus for endlessly recording photographed video images. The recording apparatus records the video images on a recording medium as a file, at the same time, the video images are transmitted to a data server, receives a reception information indicating that the video images have been received from the data server, not to erase, from the recording medium, the file of an interval wherein the reception information can not be received in the video images recorded on the recording medium. The file of the interval is transmitted again and coupled by the data server to be video data. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for recording high-quality video / audio data, such as a video camera for broadcasting business, and more particularly to a recording apparatus for transmitting recorded video / audio data to a remote device by network transmission.

  In recent years, wireless network technologies such as mobile phones and WiMAX are rapidly spreading. A system has been devised that uses such a wireless network to transmit video / audio data shot and recorded by a video camera to a remote location.

For example, in Japanese Patent Laid-Open No. 2004-260260, the frames are thinned out in units of MPEG frames (I, P, B, etc.) according to the line state during shooting, and the remaining MPEG frame data is transmitted after shooting is stopped. On the receiving device side, during shooting, a moving image composed of the received MPEG frames is reproduced. It is also possible to generate MPEG data by merging MPEG frames received during shooting and MPEG frames received after shooting stops.
JP 2007-274443 A

  However, the technique described in Patent Document 1 does not assume a case in which a situation in which data transmission cannot be performed temporarily due to a sudden deterioration in the transmission state is not assumed. That is, Patent Document 1 does not describe a re-transmission unit and a coupling unit on the receiving side for recovering a section in which data transmission is impossible and transmission is not possible.

  The present invention is a recording device that records the captured video and transmits it to another device in consideration of the above-described conventional problems, and temporarily cannot transmit data to the other device during shooting. Therefore, an object of the present invention is to provide a recording apparatus that can cause the other apparatus to receive all data of a photographed video image.

  The above problems are solved by the present invention described below. That is, a recording apparatus according to the present invention is a recording apparatus that records a captured video on a recording medium and transmits the recorded video to a server apparatus, an imaging unit that captures the video, and deletion of data recorded on the recording medium. Recording that continuously records video data obtained from the imaging unit on the recording medium by overwriting an area in which data indicated to be erasable is recorded in the management information indicating availability Means, transmission means for sequentially transmitting a plurality of partial data, each of which is a portion of the video data, to the server device, and transmitted by the server device each time the server device receives the partial data, A receiving unit that receives reception information indicating that the server device has received the partial data, and a plurality of partial data transmitted by the transmitting unit, And a control means for partial data other than Received data is partial data corresponding to the received information received by the serial receiving means rewrites said management information so as not to be removed from the recording medium.

  As a result, the recording apparatus of the present invention continues to record the video data on the recording medium by so-called endless recording, while deleting the partial data that the server apparatus could not receive from the recording medium due to a malfunction of the communication line or the server apparatus. Can be protected.

Therefore, it is possible to cause the server device to receive all data of the captured video.
Further, the present invention can be realized as a recording method using steps of the characteristic components of the recording apparatus of the present invention as a step, or can be realized as a program for causing a computer to execute these steps, or the program can be recorded. It can also be realized as a recording medium. The program can be distributed via a transmission medium such as the Internet or a recording medium such as a DVD.

  To provide a recording device that allows a server device to receive all data of a photographed video even when data transmission with the server device is temporarily impossible during photographing. Can do.

  For example, it is assumed that the recording apparatus of the present invention is realized as a video camera, and a video data transmission system is constructed by the video camera, a server apparatus for recording video data, and a network connecting them.

  In this video data transmission system, for example, when the network is interrupted, video data for that period is recorded on the video camera side. Thereby, the reliability with respect to the data recording in a video data system can be improved.

  Further, since the video camera performs endless recording, the video data can be traced back to some extent.

  Thus, even if the determination of reception failure or transmission failure is delayed to some extent, it is possible to transmit video data that the server device could not receive.

The best mode for carrying out the present invention will be described below with reference to the drawings.
First, the outline of the video data transfer system according to the embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a diagram showing a hardware configuration of a video data transmission system according to an embodiment of the present invention. The recording apparatus 100 transmits video data to the data server 110 through the network 120 simultaneously with endless recording of the video.

  In the present embodiment, the recording apparatus 100 is realized as a video camera. Endless recording is a recording method for continuously recording video data obtained from imaging means such as a camera on a recording medium. Details of the endless recording will be described later with reference to FIG.

  The data server 110 is an example of a server device that is a communication partner of the recording device of the present invention, and records received video data as one video data.

  The recording apparatus 100 protects the video data that could not be transmitted from being deleted during the endless recording process when the transmission of the video data failed due to, for example, network transfer becoming impossible.

  Further, the recording device 100 retransmits the protected video data when network transfer becomes possible again. The data server 110 can continuously record all of the data constituting the video captured by the recording device 100 by combining the plurality of video data received from the recording device 100. The network 120 is an intranet such as the Internet or a television station.

  Next, the configuration and processing contents of the recording apparatus 100 and the data server 110 according to the embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 2 is a block diagram illustrating a configuration of the recording apparatus 100 according to the embodiment. The recording apparatus 100 includes a system control unit 200, a setting recording unit 210, a recording medium 211, an instruction input unit 214 that receives an instruction from a user, a video / audio input unit 212 that inputs a video signal and an audio signal, It includes an encoder 213 that encodes video signals and audio signals, an LCD monitor 215 that displays warnings, and a communication device 216.

  The system control unit 200 is an example of a control unit in the recording apparatus of the present invention, and is realized by, for example, a computer including a CPU and a memory (not shown). The system control unit 200 includes a clip file processing unit 201, a communication processing unit 202, a device setting processing unit 203, a free space search processing unit 204, and a file system 205.

  These information processing functions included in each unit included in the system control unit 200 are realized by the CPU executing various programs.

  The setting recording unit 210 is a recording medium for storing device settings, and is preferably a non-volatile one. For example, a flash memory is preferable. The recording medium 211 is a recording medium for recording video and audio, and is preferably a small and durable SD memory card.

  The video signal input from the video / audio input unit 212 is sequentially compressed by the encoder 213 into encoded data. The encoded data is stored in a recording buffer memory (not shown). Note that encoded data for several frames can be accumulated in the recording buffer memory, and is accumulated by FIFO (First In First Out). The recording buffer memory is built in the encoder 213, for example.

  The encoded data stored in the recording buffer memory is read by the clip file processing unit 201, converted into a file in MXF (Material Exchange Format) format, and recorded on the recording medium 211.

  The encoded data stored in the recording buffer memory is transmitted to the data server 110 by the communication processing unit 202 through the communication device 216. Note that the communication processing unit 202 implements an information transmission / reception function by the transmission unit and reception unit in the recording apparatus of the present invention.

  When the communication processing unit 202 transmits the encoded data, the clip file processing unit 201 creates the data of the first frame of the encoded data as a thumbnail image that is an image file in the bitmap format and records it on the recording medium 211. The data server 110 also transmits the data.

  The thumbnail image data is displayed on the LCD monitor 215 as a thumbnail list. The thumbnail image data makes it easy to find a desired video from the recording medium 211. Therefore, the image size does not need to be large. For example, the image data is compressed into image data of 80 pixels vertically, 60 pixels horizontally, and 24 bits per pixel.

  The audio signal input from the video / audio input unit 212 is compressed by the encoder 213 into audio data. The audio data is filed in the Wave format by the clip file processing unit 201 and recorded on the recording medium 211. Further, the data is transmitted to the data server 110 by the communication processing unit 202.

  Note that video data and audio data are in separate files. When editing for business purposes such as broadcasting stations, video and audio are often edited independently. This is because it is common to create a separate file for audio and audio. A combination of the video file and the audio file is called a clip.

  The communication device 216 is an interface for connecting to the network 120. For example, a wireless LAN adapter or a wired network adapter is preferable.

  The LCD monitor 215 displays not only thumbnails of video data but also the video being shot, an error or warning at the time of recording, a display of the free capacity of the recording medium 211, and the like. It is. The LCD monitor 215 preferably has a size of about 3.5 inches that can be seen during shooting.

  The file system 205 is an example of a recording unit in the recording apparatus of the present invention, and is a processing unit that manages files in units of blocks and writes data to the recording medium 211 using the block arrangement information of the files. is there. Specifically, it is realized by a program that manages reading and writing of data with respect to the recording medium 211.

  Further, as a method adopted by the file system 205, for example, a FAT (File Allocation Table) file system is preferable. In the FAT file system, data is managed in blocks called clusters, and for files and directories, file names, creation dates and times, file attributes, file sizes, starting clusters, and the like can be acquired from information called directory entries.

  In addition, information such as the position and order of clusters used by the file is recorded in a table for managing data arrangement called FAT.

  The recording medium 211 is formatted with the FAT file system, and writing of the file to the recording medium 211 is performed by the file system 205 by updating the FAT and writing data.

  The directory entry for data recorded on the recording medium 211 is an example of management information in the recording apparatus of the present invention. In the present embodiment, it is stored in a predetermined area in the recording medium 211.

  The clip file processing unit 201 creates clip management information for managing and associating information such as a frame rate and the number of frames of video data and audio data, and a duration in which the data size is represented by the number of frames. Create a file in XML format.

  Clip management information is also recorded on the recording medium 211 by the file system 205. The clip includes clip management information.

FIG. 3 is a diagram illustrating an example of a clip management information file.
In FIG. 3, a tag 300 is information on the entire clip, and a shot ID, a clip name, a start time code, and a duration representing the total number of frames of the clip are recorded.

  Note that “shot” refers to video content that can be captured in a single shot. In other words, when the data size is increased, the recorded clips are collectively called a shot when they are divided and recorded into a plurality of clips.

  The shot ID is a unique ID assigned to each shot. Clips having the same shot ID are clips that constitute the same shot. Further, the order of the clips constituting the shot is determined by the start time code.

  A tag 301 is video information in which a file type of a video file, a video codec, a frame rate, an offset position of actual video data, and a data size are recorded.

  In the example of FIG. 3, it can be seen that DVCPRO HD 1080 / 60i video recorded at a compression rate of 100 Mbps is recorded as an MXF file. The actual data offset position is “32768”. That is, since the size of the MXF file header is 32 KB, it can be seen that the offset position of the actual data is after the MXF file header.

  A tag 302 is audio information, in which a file type, a sampling rate, a quantization bit number, an actual audio offset position, and a data size are recorded.

  The video file, audio file, and clip management information file are arranged in a directory structure as shown in FIG.

  As shown in FIG. 4, each clip file is arranged in a separate directory for each file type in the recording medium 211, and the file name of each clip file has an extension to the clip name described in the clip management information file. Is added.

  Therefore, by referring to all clip management information files in the “CLIP” directory, information on all clips recorded on the recording medium 211 can be acquired.

Next, an endless recording method will be described with reference to FIG.
When recording a shot with the recording apparatus 100, if the clip reaches a specified size, it is recorded as a separate clip. For example, in the case of the FAT file system, the maximum file size is 4 GB. Therefore, when the video file having the largest data size per frame in the clip file reaches 4 GB, it is recorded as a separate clip.

  In FIG. 5A, during normal recording, a shot is divided into four clips and recorded. (B) When there is no free space, the top clip is deleted to create a recordable area. (C) After deletion, a new clip is recorded in the vacant area. By doing the same thereafter, the video being shot can be recorded endlessly.

  The recording apparatus 100 records the clip on the recording medium 211 in this way, and transmits the clip data to the data server 110 at the same time. Further, if transmission times out during this data transmission period, the section that has timed out is not deleted by endless recording.

  Note that “transmission times out” means that reception information indicating that the partial data has been received is received from the data server 110 within a predetermined period after the transmission processing of the partial data that is the data of the partial section in the video data. It means not.

  For example, when the transmitted partial data does not reach the data server 110 due to a malfunction of the network 120, or when the partial data reception process is not normally completed due to a malfunction of the data server 110, the transmission times out. Become.

  That is, the recording apparatus 100 protects the partial data other than the received data received by the data server 110 from being deleted.

  Specifically, (d) at the time of transmission timeout, the section that has timed out is divided into files to prohibit deletion. Deletion is prohibited by setting the read-only attribute flag of the file attribute of the directory entry.

  In other words, the area where recorded data is deleted and overwritten in endless recording is an area indicating that the read-only attribute flag is not set in the directory entry corresponding to the data and can be deleted. Details of the directory entry will be described later.

  Processing when the recording apparatus 100 records a clip will be described with reference to the flowchart of FIG.

  When the photographer starts photographing using the instruction input unit 214, the encoded data compressed by the encoder 213 is sequentially stored in a recording buffer memory (not shown), and the process of the flowchart of FIG. 6 is executed.

  In step S600, it is confirmed whether shooting has stopped. That is, when the photographer requests to stop photographing using the instruction input unit 214 and there is no encoded data to be recorded in the recording buffer memory (No in S600), the process is terminated. If not (Yes in S600), the process proceeds to step S601.

  In step S601, the system control unit 200 reads encoded data from the recording buffer memory and records it in a main storage memory (not shown). At this time, if there is no encoded data to be recorded in the recording medium 211 already in the recording buffer memory (failed in S601), that is, the speed at which the encoded data is accumulated in the recording buffer memory is the same as that of the recording medium 211. If the recording speed is not in time, the process proceeds to step S607, an error is displayed on the LCD monitor 215, and the process is terminated. Otherwise (success in S601), the process proceeds to step S602.

  In step S602, the system control unit 200 registers the data recorded in the main memory in step S601 in the list as transmission data.

  List registration is performed by managing a list of transmission data pointers in the main memory. The registered transmission data is transmitted to the data server 110 in the registered order by a transmission process described later. Thereafter, the process proceeds to step S603.

  Note that the unit for managing the transmission data is a multiple of the cluster size. This is to facilitate file division when transmission times out. Also, when the cluster size on the data server 110 side is the same, it is also easy to record after receiving data on the data server 110 side.

  In step S603, it is checked whether or not the recording medium 211 has a free area for recording the data recorded in the main storage memory in step S601. In the case of the FAT32 file system, the size of the free area is recorded in an area called “FS INFO”. Therefore, it can be acquired by reading this area.

  In the case of the FAT12 and FAT16 file systems, the free capacity search processing unit 204 can obtain the FAT table by counting the number of unused clusters in the FAT table.

  If the size of the data to be recorded is smaller than the size of the free area (Yes in S603), there is an area that can be recorded, and the process proceeds to step S606. If not (No in S603), the process proceeds to Step S604.

  In step S604, it is checked whether a recordable area is created by deleting the file. In other words, the file size can be recorded by deleting the file by summing the sizes of the files for which the read-only attribute flag of the file attribute of the directory entry is set by the free space search processing unit 204 and taking the difference from the capacity of the recording medium 211. The size of the area can be acquired.

  If this size is larger than the size of data to be recorded (Yes in S604), there is an area that can be recorded by deleting the file, and the process advances to step S605. If not (No in S604), there is no recordable area, so the process proceeds to step S607, an error is displayed on the LCD monitor 215, and the process ends.

  Note that the size of the recordable area resulting from file deletion is useful information for the photographer if displayed as a recordable capacity on the LCD monitor 215.

  In step S605, the file is deleted. Files to be deleted are ordered from the oldest directory entry creation date. Files with the read-only attribute flag set for file attributes are not subject to deletion.

  At this time, if the deletion has failed due to a failure of the recording medium 211 or the like (failed in S605), the process proceeds to step S607, an error is displayed on the LCD monitor 215, and the process ends. If the deletion is successful (successful in S605), the process proceeds to step S603, where it is checked whether an empty area that can be recorded by file deletion is created.

  In step S606, the data recorded in the main memory in step S601 is read from the main memory and written to the recording medium 211. At this time, if writing has failed due to a failure of the recording medium 211 or the like (failed in S606), the process proceeds to step S607, an error is displayed on the LCD monitor 215, and the process ends. If the writing is successful (success in S606), the process proceeds to step S600, and the recording process is continued.

  Through the above processing flow, the recording apparatus 100 can endlessly record clip data on the recording medium 211.

  Processing when the recording apparatus 100 transmits data to the data server 110 will be described with reference to the flowchart of FIG.

  Note that when the recording apparatus 100 is activated or when a server address is set by the device setting processing unit 203, the processing of the flowchart in FIG. 7 is executed as a transmission process.

  In step S700, the transmission list registered in step S602 of the flowchart of FIG. 6 is checked. If data to be transmitted is registered in the transmission list (Yes in S700), the process proceeds to step S704. If the data to be transmitted is not registered (No in S700), the process proceeds to step S701.

  In step S701, the transmission waiting list is checked. The transmission waiting list is a list in which files that have been registered in step S711, which will be described later, and that have become transmission-timeout files and become deletion-prohibited files are registered.

  In the recording apparatus 100 according to the present embodiment, data registered in the transmission list is preferentially transmitted, and when the transmission list becomes empty, the file registered in the transmission waiting list is transmitted. If there is a registration in the transmission waiting list (Yes in S701), the process proceeds to step S702. If there is no registration in the transmission waiting list (No in S701), the process proceeds to step S700 and is repeated until data to be transmitted is registered in the transmission list.

In step S702, the margin of the recording buffer memory is checked.
Here, in order to transmit the file registered in the transmission waiting list, it is necessary to read the target file from the recording medium 211. However, when a file is read from the recording medium 211 while a clip is being recorded on the recording medium 211, the recording transfer speed is affected.

  Therefore, if the amount of encoded data stored in the recording buffer memory is below a certain threshold, the encoded data in the recording buffer memory is stored without being expelled even if the writing to the recording medium 211 is somewhat delayed. Go. Therefore, in this case, it is considered that the recording buffer memory has a margin.

  As described above, when it is determined that the recording buffer memory has a margin as a result of the comparison between the storage amount of the recording buffer memory and the threshold value (Yes in S702), the process proceeds to step S703. If it is determined that there is no room (No in S702), the process proceeds to step S702, and the reading process is not performed until there is room.

  In step S703, the file described at the top of the transmission waiting list is read from the recording medium 211 into the main storage memory. If reading has failed due to a failure of the recording medium 211 or the like (failed in S703), the process proceeds to step S714, an error is displayed on the LCD monitor 215, and the process ends.

  If the reading is successful (successful in S703), the read data is transmitted to the main memory in step S704. The transmission destination address is read from the setting recording unit 210 by the device setting processing unit 203.

  Note that the number of files, each file name, each file size, and a transmission number are added as header information to the head of the data to be transmitted. The transmission number is an index value that is 0 for the first transmission for each file and increments for each transmission.

  In step S705, a response from the data server 110 to the transmission is accepted. If there is a response (Yes in S705), the process proceeds to step S707, and if there is no response (No in S705), the process proceeds to step S706.

  In step S706, if a predetermined time has elapsed from the transmission time in step S704, it is regarded as a timeout (Yes in S706), and the process proceeds to step S712 to divide the data of the target portion into files. If it is not time-out (No in S706), the process proceeds to step S705 and waits for a response again.

  If there is a response from the data server 110 (Yes in S705), the type of the response is checked in step S707. When the response is an “ACK” command (Yes in S707), it means that the data server 110 has correctly received and recorded the transmission data. Therefore, the recording apparatus 100 proceeds with the process to step S708 to perform post-processing. The “ACK” command is an example of reception information received by the recording apparatus of the present invention.

  If the response is not an “ACK” command (No in S707), it means that an error has occurred in the data server 110. Therefore, the recording apparatus 100 advances the process to step S712 in order to keep the data of the target portion.

  In step S708, it is checked whether the transmitted data (S704) is data registered in the transmission list. If the data is registered in the transmission list (Yes in S708), the process proceeds to step S709.

  If the transmitted data (S704) is not data registered in the transmission list (No in S708), that is, if it is data registered in the transmission waiting list, step S710 is performed to release the deletion prohibition. Proceed to

  In step S709, the transmitted data is deleted from the transmission list. That is, by deleting the pointer of the transmitted data from the transmission list held in the main memory, it can be removed from the transmission list. Then, it progresses to step S700 and continues a transmission process.

  In step S712, file division is performed so that the transmission data is not erased by endless recording. That is, the file is divided in order to separate the transmission data from the file including the transmission data. Further, the transmission data is set to prohibit deletion. Details of the file division process and the deletion prohibition setting process will be described later.

  If the file division or deletion prohibition setting fails due to a failure of the recording medium 211 or the like (failed in S712), the process proceeds to step S714, an error is displayed on the LCD monitor 215, and the process ends. Otherwise (success in S712), the process proceeds to step S713.

  In step S713, the file obtained by the division is registered in the transmission waiting list. That is, partial data other than the partial data corresponding to the received information received by the recording apparatus 100 among the plurality of partial data that the recording apparatus 100 should transmit to the data server 110 is registered in the transmission waiting list as one file.

  The transmission waiting list may be managed on the main storage memory or may be recorded as a file on the recording medium 211. Here, management is performed on the main memory. That is, file names are managed in a list format on the main memory. Therefore, it is transmitted later in the order of file division. After the registration process to the transmission waiting list (S713), the process proceeds to step S700 in order to continue the transmission process.

  In step S710, the file that has been set to deletion prohibition is set to deletion permission. This is done by clearing the read-only attribute flag for the directory entry of the target file. If the release has failed due to a failure of the recording medium 211 or the like (failed in S710), the process proceeds to step S714, an error is displayed on the LCD monitor 215, and the process ends. Otherwise (success in S710), the process proceeds to step S711.

  In step S711, the target file is deleted from the transmission waiting list. After the deletion process (S711), the process proceeds to step S700 to continue the transmission process.

  With the above processing, clip data can be transmitted from the recording apparatus 100 to the data server 110.

  Next, file division processing and deletion prohibition setting processing will be described with reference to the drawings.

  FIG. 8 is a diagram showing an example of the file arrangement of the recording medium 211 when the clip is recorded, the cluster chain of the FAT table, and the directory entries of the video file and the audio file.

  In the directory entry 800, the file name, attribute, head cluster, and size of each file are recorded. The file name is the clip name with an extension.

  Further, as shown in FIG. 8, when the read-only attribute flag is not set, “normal” is written. When the read-only attribute flag is set, “read only” is written as shown in FIG.

  That is, the directory entry recorded as “normal” indicates that the data corresponding to the directory entry can be deleted. The directory entry recorded as “read only” indicates that the corresponding data corresponding to the directory entry is prohibited from being deleted.

  Further, according to FIG. 8, it can be seen that the last cluster of each transmission data is chained to the first cluster of the next transmission data.

  For example, in the FAT table corresponding to the final cluster (cluster number 9) of the video file in the data with the transmission number “1” (first transmission data), the data with the transmission number “2” as the next cluster number ( “12” which is the number of the first cluster of the video file in the second transmission data) is recorded.

  Note that each of the first transmission data to the fourth transmission data shown in FIG. 8 is an example of partial data in the recording apparatus of the present invention.

  Each transmission data is composed of 5 clusters. That is, in the present embodiment, the recording apparatus 100 sequentially transmits data in units of 5 clusters.

  The attributes recorded in the directory entry 800 include a hidden file attribute flag in addition to the above read-only attribute flag.

  FIG. 9 is a diagram showing examples of file arrangement, FAT table cluster chain, and video file and audio file directory entries when the transmission of the second transmission data times out and file division is performed.

  When file division is performed on the second transmission data, the FAT table values of the end cluster of the first transmission data and the end cluster of the second transmission data, which are data before the second transmission data, represent the end of the file. “EOF”.

  In addition, a directory entry 902 indicating the first cluster of data (third transmission data) having a transmission number “3”, which is data subsequent to the second transmission data, and a directory entry 901 indicating the first cluster of the second transmission data. Create a new. The file name is a clip name with a transmission number added.

  Further, the attribute of the directory entry 901 of the second transmission data whose transmission has timed out is set to “read only”. Thereby, the second transmission data is protected and deletion is avoided. Also, the size of the directory entry 900 is updated.

  As described above, the recording apparatus 100 according to the present embodiment can divide a file recorded on the recording medium 211 to separate data that needs to be transmitted later, and set the deletion of the data to be prohibited. I can do it.

  FIG. 10 is a block diagram showing the configuration of the data server 110. The data server 110 is realized by, for example, a personal computer or a workstation.

  The data server 110 includes a system control unit 1000, a recording medium 1010, an instruction input unit 1011 that receives instructions from the user, a monitor 1012 that displays thumbnails of video data, and the decoded video and audio signals. A video / audio output unit 1013 for output and a communication device 1014 are provided.

  The information processing functions of the clip file processing unit 1001, the communication processing unit 1002, the file system 1003, and the decoding processing unit 1004 included in the system control unit 1000 are functions of an OS (Operating System) or the OS. Realized by the application running above.

  The recording medium 1010 is a recording medium for recording received clip data, and is preferably a large capacity and highly reliable RAID (Redundant Arrays of Inexpensive Disks) or the like.

  The instruction input unit 1011 is a keyboard, a mouse, or the like, and performs operations such as playing back a clip while viewing thumbnails displayed on the monitor 1012.

  The communication device 1014 is an interface for connecting to the network 120. For example, a wireless LAN adapter or a wired network adapter is preferable.

  The recording medium 1010 is preferably formatted using the same file system as that of the recording medium 211 of the recording apparatus 100 and has the same cluster size. Therefore, the file system 1003 is preferably the same as the file system 205 of the recording apparatus 100. That is, the recording medium 1010 is formatted with the FAT file system.

  Processing when the data server 110 receives data from the recording apparatus 100 will be described with reference to the flowchart of FIG.

  In step S1100, if there is data transmission from the recording apparatus 100, the data is received (Yes in S1100), and the process proceeds to step S1101. If there is no data transmission (No in S1100), the process proceeds to step S1100 and waits for reception again.

  In step S1101, the header of the data received in step S1100 is analyzed, and the file name and the reception number are specified. In the data server 110, the transmission number added to each transmission data by the recording apparatus 100 is handled as a reception number. That is, when the data server 110 receives data having a transmission number “1”, the data server 110 identifies the reception number of the data as “1”.

  Data other than the header is stored in the main memory as recording data. The reception number is also stored in the main memory for each file. Thereafter, the process proceeds to step S1102.

  In step S1102, it is checked whether the received data is the first data. That is, if the reception number acquired in step S1101 is “1” (Yes in S1102), the process proceeds to step S1104 to perform normal file recording. If not (No in S1102), the process proceeds to step S1103.

  In step S1103, it is checked whether the received data is continuous with the data received so far. That is, it is checked whether the reception number acquired in step S1101 is continuous with the reception number held in the main memory.

  For example, if the reception numbers of the data received so far are “1” and “3” and the reception number of the newly received data is “2”, it is considered that they are continuous. Further, when the reception number of newly received data is “5”, it is not regarded as continuous.

  As a result of such determination, if they are continuous (Yes in S1103), the process proceeds to step S1105 because it is necessary to connect the files. If not (No in S1103), the process proceeds to step S1104 to perform normal file recording.

  In step S1104, the received data is recorded on the recording medium 1010. The received data is a multiple of the cluster size of the recording medium 211 of the recording apparatus 100, while the cluster size of the recording medium 1010 is also the same size as the cluster size of the recording medium 211 of the recording apparatus 100. For these reasons, the received data can be recorded so as to fit in each cluster of the recording medium 1010.

  At this time, if writing to the recording medium 1010 cannot be performed because there is no free space or the like (failed in S1104), the process proceeds to step S1107, an “ERR” command is transmitted to the recording apparatus 100, and an error is displayed on the monitor 1012.

  When the “ERR” command is transmitted to the recording apparatus 100, data corresponding to the “ERR” command is retransmitted later. Therefore, the user deletes unnecessary files using the instruction input unit 1011.

  If the recording of the received data on the recording medium 1010 is successful (successful in S1104), the process proceeds to step S1106, and an “ACK” command is transmitted to the recording apparatus 100. Then, it progresses to step S1100 and waits for reception again.

  In step S1105, the received data is recorded on the recording medium 1010, and the reception number is combined with the preceding and succeeding data. The joining process is performed by changing the chain of the FAT table. Details of the combining process will be described later with reference to FIGS.

  If the received data cannot be recorded on the recording medium 1010 due to a failure of the recording medium 1010 (failed in S1105), the process proceeds to step S1107, an “ERR” command is transmitted to the recording apparatus 100, and an error display is displayed on the monitor 1012. Do. If the recording of the received data on the recording medium 1010 is successful (successful in S1105), the process proceeds to step S1106, and an “ACK” command is transmitted to the recording apparatus 100. Then, it progresses to step S1100 and waits for reception again.

  The data server 110 in the present embodiment can receive clip data from the recording apparatus 100 by the above processing.

Next, file combination processing will be described with reference to the drawings.
FIG. 12 shows examples of the file arrangement of the recording medium 1010 when the data having the reception numbers “1” and “3” are received and recorded, the cluster chain of the FAT table, and the directory entries of the video file and the audio file. FIG.

  The directory entry 1200 is a file related to data (first received data) whose reception number is “1”. The directory entry 1201 is a file related to data with the reception number “3” (third reception data).

  The file name is obtained by adding the reception number to the clip name. Since the data file with the reception number “1” is the first data, the clip name is used as the file name.

  FIG. 13 is a diagram showing an example of the file arrangement of the recording medium 1010, the FAT chain cluster chain, and the video file and audio file directory entries when the data having the reception number “2” is received and recorded.

  Data with the reception number “2” (second reception data) is recorded in an empty cluster (see FIG. 12). Further, the FAT table is rewritten so that the final cluster of the first received data is connected to the leading cluster of the second received data, and the final cluster of the second received data is connected to the leading cluster of the third received data.

  Further, the directory entry of the third received data is deleted, and the size value of the directory entry 1300 of the first received data is updated. The size value is obtained as the sum of each data size. By doing in this way, it can connect as one file.

  As described above, in the video data transmission system according to the embodiment of the present invention, even when the network 120 is interrupted, video data for that period can be recorded on the recording device 100 side. Thereby, the reliability with respect to the data recording in a video data system can be improved.

  In the recording apparatus 100, the video data can be traced back to some extent. Therefore, even if the transmission failure determination is delayed to some extent, it is possible to transmit video data that the data server 110 could not receive.

  In the present embodiment, the file system of the recording apparatus 100 and the data server 110 is a common FAT file system, and the cluster size is also shared, so that video data can be combined in the data server 110.

  However, the video data is received by the data server 110, and the file list is described in the clip management file by the clip file processing unit 1001. Further, each file is accessed when the clip is referred to for reproduction or the like. The data server 110 can also handle a plurality of pieces of data received separately as one video data by such processing.

  FIG. 14 is a diagram illustrating an example of a directory structure of a clip file when a file is recorded for each received data.

  As shown in FIG. 14, each piece of received data is arranged as a file in a separate directory for each type. Specifically, each received data is recorded with a file name obtained by adding a reception number to a clip name.

FIG. 15 shows an example of a clip information management file.
A tag 1500 indicates information of received data recorded as a video file. There are as many video files as the number of “<VideoIndex>” tags in the tag 1500. Similarly, a tag 1501 indicates information of received data recorded as an audio file.

  As described above, even when the data server 110 treats each of the data transmitted from the recording apparatus 100 as a separate file, the data server 110 refers to each file name and clip information management to receive a plurality of received data. Can be handled as a single video data.

  Further, in the present embodiment, in order to protect the data that could not be received by the data server 110 with the recording device 100, a read-only attribute flag (“read only”) is recorded in the directory entry corresponding to the data. did.

  This is because the writable attribute flag (“normal”) is set as the initial state of the directory entry in the recording medium 211.

  In other words, at the time when each of the plurality of partial data is transmitted, if contents indicating that each of the plurality of partial data can be deleted is recorded in the management information, only the partial data other than the received data can be deleted. Management information is rewritten from a certain content to a content that cannot be deleted. This protects data that the data server 110 could not receive.

  However, data that could not be received by the data server 110 may be protected by other methods. For example, when certain partial data is transmitted, a read-only attribute flag (for example, “read only”) is recorded in a directory entry corresponding to the partial data. Thereafter, when it is confirmed by the “ACK” command or the like that the data has been received by the data server 110, the read-only attribute flag of the directory entry is rewritten to a writable attribute flag (for example, “normal”).

  In other words, at the time when each of the partial data is transmitted, if the contents indicating that each of the partial data is prohibited to be deleted are recorded in the management information, only the received data is deleted from the prohibited content. Rewrite the content as possible.

  The recording apparatus 100 can protect the data that the data server 110 could not receive by rewriting the directory entry as management information in this way.

  In the recording apparatus according to the present invention, even when the network is interrupted, the reliability can be improved by recording the video data of the period on the recording apparatus side, and even if the transmission failure determination is delayed, the video is recorded. Data can be traced back to some extent, which is effective when recording for a long time even in a recording apparatus with a small capacity.

It is a figure showing the hardware constitutions of the video data transmission system in embodiment of this invention. 1 is a block diagram illustrating a configuration of a recording apparatus according to an embodiment of the present invention. It is a figure which shows an example of the clip management information file in embodiment of this invention. It is a figure which shows the directory structure of the clip file in embodiment of this invention. It is a figure for demonstrating the endless recording in embodiment of this invention. It is a flowchart of the recording process in embodiment of this invention. It is a flowchart of the transmission process in embodiment of this invention. It is a figure which shows the example of each of the data area at the time of clip recording in Embodiment of this invention, arrangement | positioning of FAT, and a directory entry. It is a figure which shows the example of each of the data area | region after a file division | segmentation, FAT arrangement | positioning, and a directory entry in embodiment of this invention. It is a block diagram which shows the structure of the data server in embodiment of this invention. It is a flowchart of the reception process of the data server in embodiment of this invention. It is a figure which shows the example of each of the data area at the time of data reception in the embodiment of this invention, arrangement | positioning of FAT, and a directory entry. It is a figure which shows the example of each of the data area | region after file coupling | bonding, FAT arrangement | positioning, and a directory entry in embodiment of this invention. It is a figure which shows an example of the directory structure of the clip file in the case of recording a file for every received data in embodiment of this invention. It is a figure which shows an example of a structure of the clip management information file at the time of recording a file for every received data in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Recording apparatus 110 Data server 120 Network 200 System control part 201 Clip file process part 202 Communication process part 203 Equipment setting process part 204 Free capacity search process part 205 File system 210 Setting recording part 211 Recording medium 212 Video | audio input part 213 Encoder 214 Instruction Input Unit 215 LCD Monitor 216 Communication Device 1000 System Control Unit 1001 Clip File Processing Unit 1002 Communication Processing Unit 1003 File System 1004 Decode Processing Unit 1010 Recording Medium 1011 Instruction Input Unit 1012 Monitor 1013 Video / Audio Output Unit 1014 Communication Device

Claims (10)

A recording device that records a captured video on a recording medium and transmits the video to a server device,
Imaging means for imaging video;
The video data continuously obtained from the imaging means is obtained by overwriting the area where data indicated to be erasable is recorded in the management information indicating whether or not the data recorded on the recording medium is erasable. Recording means for continuously recording on the recording medium;
Transmitting means for sequentially transmitting a plurality of partial data, each of which is a portion of the video data, to the server device;
Receiving means for receiving reception information indicating that the server apparatus has received the partial data, transmitted by the server apparatus each time the server apparatus receives the partial data;
Among the plurality of partial data transmitted by the transmission unit, the management information is set so that partial data other than received data that is partial data corresponding to the reception information received by the reception unit is not deleted from the recording medium. A recording apparatus comprising: a control means for rewriting. The recording apparatus according to claim 1, wherein the transmission unit further transmits partial data other than the received data to the server apparatus again. Furthermore, a buffer for temporarily storing data to be recorded on the recording medium before being recorded on the recording medium,
The transmission means transmits again partial data other than the received data read from the recording medium to the server device when the amount of data stored in the buffer is equal to or less than a threshold value. Recording device. The control means includes
If the receiving unit does not receive the reception information corresponding to the partial data within a predetermined period after the transmitting unit transmits one partial data, the management is performed so that the partial data is not deleted from the recording medium. The recording apparatus according to claim 1, wherein information is rewritten. The recording means records a set of a predetermined number of partial data on the recording medium as one file;
The recording apparatus according to claim 1, wherein, when rewriting the management information, the control unit divides the file in order to separate partial data other than the received data from a file including the partial data. At the time when each of the plurality of partial data is transmitted by the transmission means, the management information includes a content indicating that each of the plurality of partial data can be deleted,
The recording apparatus according to any one of claims 1 to 5, wherein when the management information is rewritten, the control information is rewritten from contents that can be deleted only to partial data other than the received data to contents that are prohibited to be deleted. . At the time when each of the plurality of partial data is transmitted by the transmission means, the management information is recorded with content indicating that each of the plurality of partial data is prohibited to be deleted,
The recording apparatus according to any one of claims 1 to 5, wherein, when the management information is rewritten, the control information is rewritten from content that is prohibited to be deleted to content that can be deleted only for the received data. A video data transmission system comprising: a recording device that records captured video on a recording medium; and a server device that is connected to the recording device via a network and records video data transmitted from the recording device,
The recording device includes:
Imaging means for imaging video;
The video data continuously obtained from the imaging means is obtained by overwriting the area where data indicated to be erasable is recorded in the management information indicating whether or not the data recorded on the recording medium is erasable. Recording means for continuously recording on the recording medium;
Transmitting means for sequentially transmitting a plurality of partial data, each of which is a portion of the video data, to the server device;
Receiving means for receiving reception information transmitted corresponding to the partial data from the server device;
Among the plurality of partial data transmitted by the transmission unit, the management information is set so that partial data other than received data that is partial data corresponding to the reception information received by the reception unit is not deleted from the recording medium. Rewriting control means,
The server device
A video data transmission system comprising communication means for transmitting reception information indicating that the partial data has been received to the recording device when the partial data transmitted from the recording device is received. A method of recording video data in a recording device that records a captured video on a recording medium and transmits the video to a server device,
Take a picture,
By overwriting the area where data indicated to be erasable is recorded in the management information indicating whether or not the data recorded on the recording medium can be deleted, video data obtained continuously by the imaging is obtained. Recording continuously on the recording medium,
A plurality of partial data, each of which is a portion of the video data, are sequentially transmitted to the server device,
Each time the server device receives the partial data, the server device receives reception information indicating that the server device has received the partial data.
A recording method in which the management information is rewritten so that partial data other than received data that is partial data corresponding to received reception information is not deleted from the recording medium among a plurality of transmitted partial data. A program for controlling a recording device that records video captured by an imaging unit on a recording medium and transmits the video to a server device,
The video data continuously obtained from the imaging means is obtained by overwriting the area where data indicated to be erasable is recorded in the management information indicating whether or not the data recorded on the recording medium is erasable. , Continuously recording on the recording medium,
A plurality of partial data, each of which is a portion of the video data, are sequentially transmitted to the server device,
Each time the server device receives the partial data, the server device receives reception information indicating that the server device has received the partial data.
To cause the computer to rewrite the management information so that partial data other than received data, which is partial data corresponding to received reception information, is not deleted from the recording medium among a plurality of transmitted partial data Program.

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