JP2007080199A - Digital device using detachable recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To define a command for partial output and partial rewrite of a file on a camcorder using a random access memory medium and to obtain only header data from a controller such as a personal computer and rewrite thumbnail data. <P>SOLUTION: A "send file partial" command for partial output of a file and a "receive file partial" command for partial rewrite of a file are added to a camera storage sub-unit to attain partial read-out and partial rewrite. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus having a system for performing data communication between devices by connecting electronic devices (hereinafter referred to as devices) using a data communication bus capable of communicating by mixing control signals and data. Is.

  In recent years, digital cameras have become popular. This digital camera is a system for recording and playing back digital still image data using a removable recording medium. Data can be transferred to a personal computer by directly inserting the recording medium into the personal computer and a digital interface provided in the digital camera. There are two methods of transferring images by connecting a digital interface of a personal computer.

  When data transfer is performed by connecting a digital interface, the personal computer requests a list of data existing on the recording medium from the digital camera, and individually accesses each data based on the received list. As a standard for exchanging data between devices via the digital interface as described above, the Camera Storage subunit is defined by the 1394 Trade Association, which is a standardization body for the IEEE 1394 interface standard (TA Document 1999036, AV / C Camera Storage Subunit 1.0). The sub-unit and a controller such as a personal computer can perform a transaction via IEEE1394, and the controller can control the sub-unit and acquire information held by the sub-unit.

  This transaction is defined as FCP (Function Control Protocol) in IEC-61883-1, Consumer audio / video equipment-Digital interface-Part 1: General, and the controller performs a write transaction for a specific address of the target device. The command data is written using the target, and the target receiving the data of the write transaction writes the response data to the specific address of the controller using the write transaction. In the AV / C protocol, CTS (Command Transaction Set) is defined for each AV / C subunit, and FIG. 10 shows a command frame format used in CTS. The ctype field indicates the type of command and specifies the command type shown in FIG. The subunit_type and subunit ID fields are fields indicating which unit in the specified node is the command. The opcode and operand fields are fields for specifying the actual command contents. FIG. 11 shows a response frame format used in CTS. The response field indicates the type of response, and specifies the response type shown in FIG. The subunit_type and subunit ID fields are fields indicating from which unit in the node the response is received. The opcode and operand fields are fields for specifying response data.

  FIG. 12 shows a basic transaction procedure performed between the controller and the Camera Storage subunit via IEEE1394. The controller detects the Camera Storage subunit on the IEEE1394 bus and transmits a VERSION status command to the detected Camera Storage Subunit. This command is a command for inquiring version information of the standard implemented by the Camera Storage subunit. When this command is received, the Camera Storage subunit sets the version of the implemented standard and sends a response to the controller. The format of the VERSION status command and response is shown in FIG. When a function compliant with AV / C Camera Storage Subunit 1.0 is implemented, 0x10 is set in the subunit_version_information field in the response frame of FIG. Camera Storage subunits are categorized according to the functions they implement, and receive file data using Asynchronous sender and Asynchronous transactions, which have the function of sending file data on recording media using Asynchronous transactions. "Asynchronous receiver" with the function, "isochronous sender" with the function to send the file data on the recording medium using the isochronous transaction, and "isochronous receiver" with the function to receive the file data using the isochronous transaction A profile is defined. FIG. 32 shows the profile and the value assigned to each profile. When the Camera Storage subunit receives the VERSION status command, the value of the implemented profile is set in the subunit_version_information_dependent_field of the response frame.

The controller that has received the VERSION starus response frame determines the function of the Camera Storage subunit by each field value of the response frame.
Next, the controller transmits a MEDIA INFO command and a VOLUME INFO command in order to acquire information on the recording medium possessed by the Camera Storage subunit.

  FIG. 14 shows the format of the MEDIA INFO Control command and response. In the Camera Storage subunit, a physical volume and a logical volume are defined, the physical volume indicates a physical recording medium itself, and the logical volume indicates a logically partitioned area existing in the physical volume. The subfunction field in the control command is a field indicating what operation is requested to the subunit. FIG. 33 shows the meaning and value of subfunction. The controller sets “execute” for executing the command in the subfunction field of the command frame, and sends the command to the Camera Storage subunit. When the MEDIA INFO control command is received, the Camera Storage subunit sets the number of physical volumes that the device has (for example, the number of slots in which recording media can be set) in the number_of_physical_volume field, and the logical volumes that exist on each physical volume. (Eg, the number of partitions existing on each recording medium) is set in the number_of_logical_volume field.

  FIG. 15 shows the format of the VOLUME INFO control command and response. This command is a command for acquiring information on each logical volume of the Camera Storage subunit. The controller sets “execute” in the subfunction field, sets the volume number for acquiring information in the physical_volume_number and logical_volume_number fields, and transmits a command frame to the Camera Storage Subunit. When the VOLUME INFO Control command is received, the Camera Storage subunit sets the specified volume information in each field of the response frame and sends it to the controller. Media_generation_count in the response frame is a counter value that is counted up when a recording medium is inserted, and is updated when a removable recording medium is inserted into the device. This count value is initialized to “0” when the power is turned on, for example, and is incremented by one when updated. The attribute field indicates the attribute of the recording medium. FIG. 16 shows the format of the attribute field. The Camera Storage subunit checks the attribute of the specified volume and sets the corresponding attribute bit to “1”. The byte size of the volume specified in the maximum_capacity field is set, and the remaining recordable byte size is set in the free_space field.

  After acquiring the volume information, the controller transmits a FILE LIST Control command to acquire a list of files recorded on the recording medium of the Camera Storage subunit. FIG. 17 shows the format of the FILE LIST Control command and response. The controller sets “execute” in the subfunction field of the control command frame, and sets the target volume number in physical_volume_number and logical_volume_number. A value acquired by the VOLUME INFO control response is set in the mediga_generation_count field. The file_type field and the attribute field are fields that specify the type of entry included in the file list to be acquired. FIG. 34 shows the value of the file_type field, and FIG. 18 shows the format of the attribute field. The start_number field indicates from which entry of the corresponding file list the list is to be acquired, and the number_of_entries field of the command frame specifies the maximum number of entries to be acquired. The request_path_length field indicates the byte size of the subsequent request_path, and the request_path field indicates to which path in the specified volume the file list is acquired. When receiving the FILE LIST Control command, the Camera Storage subunit sets the file list for the request_path specified in the response frame and sends it to the controller. The file list is composed of directory entries of files and directories. 19 and 20 show the format of the directory entry. Each directory entry is composed of 20-byte data, and has file name or directory name, attribute, creation date and time, and file size information. In the eol field of the response frame, whether or not the last directory entry in the list transmitted in the response frame is the last directory entry in the list specified in the command frame is set. When this field is “0”, it indicates that the last directory entry in the list transmitted in the response frame is not the last directory entry in the list specified in the command frame. That is, since there is a continuation in the list, in order to acquire the entire list, the controller needs to acquire a continuation list by sending a FILE LIST Control command again. The number of directory entries set in the file_list field is set in the number_of_entries field of the response frame. In the file_list field, file_list for request_path specified in the command frame is set.

  A procedure for acquiring a file list by a FILE LIST Control command will be described with reference to FIGS.

  FIG. 21 shows an example of data existing on the recording medium of the Camera Storage subunit. These data are assumed to exist on a volume with physical_volume_number = 0 and logical_volume_number = 0. In FIG. 21, a “DCIM” directory exists under the root directory, and “100ABCDE”, “101ABCDE”, and “102ABCD” subdirectories exist below it, and JPEG files exist in each subdirectory. 22 and 23 show field values set in the FILE LIST Control command shown in FIG. 17 and part of directory entries set in the response file_list.

  First, FIG. 22A shows data for acquiring a list of subdirectories existing in the “DCIM” directory. Set start_number to 0x00 to specify that data is acquired from the top of the list. Set file_type to 0x00 and attribute to 0x01 to specify that all directory records are to be acquired. In the request_path field, set "\ DCIM" in ASCII code (add 0x00 as a terminal symbol at the end) and set the length to request_path_length.

  FIG. 22B shows the contents extracted from a part of the directory entry included in the file list created in accordance with the control command of the list request shown in FIG. Since there are three subdirectories “100ABCDE”, “101ABCDE”, and “102ABCDE” on the “\ DCIM” directory, the list is composed of three directory entries. The Camera Storage subunit sets a directory entry in the file_list field of the response frame. The maximum size of the response frame is 512 bytes, and the record is 20 bytes. Therefore, a maximum of 24 directory entries can be set in the file_list field. In this example, there are only three directory entries, so all directory entries can be set in the response frame, and the last directory entry in the list is included, so set the eol field to "1".

  By sending the command with the data shown in FIG. 22 set in the command frame and receiving the response, the controller obtains information on the “\ DCIM” directory, and then “100ABCDE” on the “\ DCIM” directory. “Sends a Control command to the Camera Storage subunit to obtain a list of still image files in the directory. FIG. 23A shows an example of data for acquiring a file list in the “\ DCIM \ 100ABCDE” directory. Set start_number to 0x00 to specify that data is acquired from the top of the list. Set file_type to 0x01 and attribute to 0x10 to specify that still image file records are to be acquired. In the request_path field, set "\ DCIM \ 100ABCDE" in ASCII code (add 0x00 as a terminal symbol at the end) and set the length to request_path_length.

  FIG. 23 (B) shows the contents extracted from a part of the directory entry included in the file list created in accordance with the control command of the list request shown in FIG. 23 (A). There are three still image files "ABCD0001.JPG", "ABCD0002.JPG", "WXYZ0003.JPG" and one text file "Readme.txt" in the "\ DCIM \ 100ABCDE" directory. For the image list request, the file list is composed of directory entries of three still image files. These three directory entries are set in the file_list field of the response frame, 1 is set in the eol field, and the Camera Storage subunit transmits a response frame to the controller.

  Using the FILE LIST Control command, the controller obtains the path of the file existing on the recording medium of the Camera Storage subunit, and sets the path of each file in the SNED FILE Control command and RECEIVE FILE Control command shown in FIG. By doing so, the target file can be accessed.

  The SEND FILE Control command is a command for outputting a file from the Camera Storage subunit, and the RECEIVE FILE Control command is a command for inputting file data to the Camera Storage subunit and recording it on a recording medium. It is. When requesting these file input / output operations to the Camera Storage subunit, the controller needs to set up a connection for file transfer between the Camera Storage subunit and an external device in order to perform input / output. In the Camera Storage subunit, this connection is AV / C Asynchronous Serial Bus Connections (TA Document 1998011, AV / C Commands for management of Asynchronous Serial Bus Connections, Ver.1.0 and TA Document 1998016, AV / C Compatible Asynchronous Serial Bus Connections 1.0 ) Is used.

  FIG. 24 shows a file transfer procedure using the connection setting and SEND FILE Control commands. First, the controller sends an ALLOCATE_ATTACH command to the AV / C unit in which the Camera Storage subunit is mounted according to the procedure defined in AV / C Asynchronous Serial Bus Connections, and between the controller and the AV / C unit. Set up a connection. Next, send the SEND FILE Control command that sets the path of the target file to the Camera Storage subunit. The Camera Storage subunit that has received the SEND FILE Control command transmits an INTERIM response to the SEND FILE command, and then searches for the file specified by the command. When the file is found, the data of the file is written to the controller device, which is a consumer, using a write transaction according to the AV / C Asynchronous Serial Bus Connections procedure. When all the data in the file has been written, the Camera Storage subunit sends a final SEND FILE response to the controller. After receiving the final response, the controller transmits a DETACH_RELEASE command to the AV / C unit in which the Camera Storage subunit is mounted, and releases the connection between the controller and the AV / C unit.

  FIG. 25 shows the format of the SEND FILE Control command and response. The controller sets “execute” in the subfunction field, and sets the volume number and the generation count value of the volume in which the target file is recorded in the physical_volume_number, logical_volume_number, and media_generation_count fields. Set the path name of the target file in the file_path field, and set its length in the file_path_length field. The source_plug field specifies from which source plug of the Camera Storage subunit the target file is output. FIG. 26 shows an example of a logical connection path between the controller and the Camera Storage subunit when performing file transfer with the SEND FILE Control command. The controller has one Asynchronous Input Plug for data input and one Asynchronous Output Plug for output. The Camera Storage subunit is mounted inside the AV / C unit, which has one Asynchronous Input Plug for data input and one Asynchronous Output Plug for output. Subunit Source Plug for data output and Subunit Destination for input Have one Plug at a time. AV / C unit Asynchronous Output Plug [0] and Camera Storage subunit Subunit Source Plug [0], AV / C unit Asynchronous Input Plug [0] and Camera Storage subunit Subunit Destination Plug [0] are in the unit. Connected internally. The controller uses the ALLOCATE_ATTACH command to connect the controller's Asynchronous Input Plug [0] to the AV / C unit's Asynchronous Output Plug [0], so that the controller's Asynchronous Input Plug [0] and the Camera Storage subunit's Subunit Source Plug Establish a connection with [0]. In the case of the connection shown in FIG. 26, 0x00 (indicating Subunit Source Plug [0]) is set in the source_plug field in the command frame of FIG. 25, and the controller transmits a SEND FILE Control command to the Camera Storage subunit. . The Camera Storage subunit that received the Control command sends an INTERIM response to the controller, then outputs the specified file from the specified Subunit Source Plug, and the AV / C unit follows the Asynchronous Serial Bus Connections procedure. When the data is sent to the controller's Asynchronous Input Plug [0] and all the file data is sent, the Camera Storage subunit sends a final response to the controller and ends the operation of the SEND FILE Control command.

  FIG. 27 shows a file transfer procedure using the connection setting and RECEIVE FILE Control commands. First, the controller transmits the ALLOCATE and ATTACH commands to the AV / C unit on which the Camera Storage subunit is mounted in accordance with the procedure defined by AV / C Asynchronous Serial Bus Connections, and the controller and the AV / C unit Set the connection between. Next, a RECEIVE FILE Control command in which the file path for recording data is set is transmitted to the Camera Storage subunit. After receiving the RECIEVE FILE Control command, the Camera Storage subunit sends an INTERIM response to the RECEIVE FILE command, and then receives it from the controller device that is the producer according to the AV / C Asynchronous Serial Bus Connections procedure. Record to a separate file. When all data recording of the file is completed, the Camera Storage subunit sends a final response of RECEIVE FILE to the controller. After receiving the final response, the controller transmits DETACH and RELEASE commands to the AV / C unit in which the Camera Storage subunit is mounted, and releases the connection between the controller and the AV / C unit.

  FIG. 28 shows the format of the RECEIVE FILE Control command and response. The controller sets “execute” in the subfunction field, and sets the volume number and the generation count value of the volume in the physical_volume_number, logical_volume_number, and media_generation_count fields. The file_path field is set with the path name of the file to be recorded, and the file_path_length field is set with the length. The receive_mode field specifies the operation when the specified file already exists on the specified volume. FIG. 35 shows the meaning and value of receive_mode. The file_type field indicates the type of data input to the Camera Storage subunit. FIG. 36 shows the meaning and value of file_type. The destination_plug field specifies from which destination plug of the Camera Storage subunit the data to be recorded is input.

  FIG. 29 shows an example of a logical connection path between the controller and the Camera Storage subunit when performing file transfer with the RECEIVE FILE Control command. The controller uses the ALLOCATE and ATTACH commands to connect the controller's Asynchronous Output Plug [0] and the AV / C unit's Asynchronous Input Plug [0], so that the controller's Asynchronous Output Plug [0] and the Camera Storage subunit's Subunit Establish a connection with Destination Plug [0]. In the case of the connection shown in FIG. 29, 0x00 (indicating Subunit Destination Plug [0]) is set in the destination_plug field in the command frame of FIG. 28, and the controller sends a RECEIVE FILE Control command to the Camera Storage subunit. . The Camera Storage subunit that has received the Control command sends an INTERIM response to the controller, and then the AV / C unit receives data from the Asynchronous Output Plug [0] of the controller according to the procedure of Asynchronous Serial Bus Connections. Input the data to the specified Subunit Destination Plug. The Cmaera Storage subunit records the data entered from the specified Subunit Destination Plug in the specified file, and when all the data is recorded, the Camera Storage subunit sends the final response to the controller and the RECEIVE FILE Control command End the operation.

Moreover, as a prior art example, patent document 1 and patent document 2 can be mention | raise | lifted, for example.
JP 2001-202973 A JP 2005-056441 A

  In the AV / C Camera Storage Subunit 1.0 described above, file data can be sent and received using the SEND FILE and RECEIVE FILE commands, but both SEND FILE and RECEIVE FILE can only send and receive data from the beginning of the target file. It was not possible to perform operations such as obtaining a part of file data or partially rewriting file data.

  In order to solve the above-mentioned problem, in the present invention, information indicating a path name of a file for designating data recorded on a recording medium, information indicating an area in which the file is recorded, and the recording are recorded. A control signal including path information for outputting file data and information for designating an output start position of the file data is received, and the designated data is output using an Asynchronous transaction.

  Also, path information for inputting data, information for designating an area for recording the inputted data, information indicating a path name for designating a file for recording the inputted data, and the designated A control signal including information for designating the recording start position of the file is received, and data input using the Asynchronous transaction from the designated path is recorded.

  As described above, by installing the SEND FILE PARTIAL command and RECEIVE FILE PARTIAL command, the controller can perform partial output and partial rewrite of files recorded on the recording medium to the Camera Storage subunit. .

Example 1
The partial output of file data in the present invention will be described below. In the present invention, a device in which a function of partial output is added to the AV / C Camera Storage subunit is used as a device for outputting a file.

  FIG. 1 shows a format of a SEND FILE PARTIAL Control command and response for partially outputting the file data of the present invention.

  Each field except the start_offset and send_size fields in the command frame has the same meaning and use as the field of the same name in the SEND FILE Control command frame.

  The start_offset field is a field for designating from which position of the designated file the data is output, and designates an offset from the top of the file by the number of bytes. If the value set in this field indicates a position that does not exist on the file, the Camera Storage subunit rejects the command by sending a REJECTED response to the command. For example, if the specified file size is 1024 bytes and start_offset is set to 2048, a REJECTED response is sent.

  The send_size field specifies how many bytes of data are output from the specified offset position. When the Camera Storage subunit finishes outputting the specified number of bytes, it sets the number of bytes of the actually output data in the sent_size field of the response frame and sends an ACCEPTED response to the controller. If the size from the specified offset position of the specified file to the data at the end of the file is smaller than the value set in the send_size fold, the Camera Storage subunit will actually output the data at the end of the file and then Set the number of bytes of output data in the sent_size field of the response frame and send an ACCEPTED response to the controller.

  The procedure for the controller to acquire the header area of the image file shown in FIG. 2 will be described below. It is assumed that this file is recorded with the file name “root.image.jpg” of the volume with physical_volume_number = 0 and logical_volume_number = 0.

  The controller uses the ALLOCATE_ATTACH command for the AV / C unit including the Camera Storage subunit and the Asynchronous Input Plug [0] of the controller and the Asynchronous of the AV / C unit including the Camera Storage subunit in the same manner as shown in FIG. Connect Output Plug [0]. The Subunit Source Plug [0] of the Camera Storage subunit and the Asynchronous Output Plug [0] of the AV / C unit are internally connected within the unit, and the logical connection between the controller and the Camera Storage subunit is shown in FIG. The connection shown in After setting the connection, the controller transmits a SEND FILE PARTIAL Control command shown in FIG. 3 to the Camera Storage subunit. After receiving the command, the Camera Storage subunit sends an INTERIM response to the controller, and then, according to the AV / C Asynchronous Serial Bus Connections procedure, the specified number of bytes from the offset specified for the controller that is the consumer. Write data and send SEND FILE PARTIAL ACCEPTED response. The controller that has received the response releases the connection between the controller and the AV / C unit using the DETACH_RELEASE command.

  Next, FIG. 4 shows the format of the SEND FILE PARTIAL Status command and response. This command is used to query the execution status of the SEND FILE PARTIAL Control command.

  The source_plug field of the command frame specifies the Subunit source plug number of the Camera Storage subunit.

  When the Camera Storage subunit that received the Status command has not executed the SEND FILE PARTIAL Control command using the specified source plug, 0xFF is set in the subfunction, physical_volume_number, logical_volume_number, and media_generation_count fields of the response frame. Set 0x00 (not executing) in the field and send it to the controller. In this case, the response frame does not include operand [5] and later.

  When the SEND FILE PARTIAL Control command using the specified source plug is being executed, the subfunction of the control command being executed is displayed in the subfunction field of the response frame, and 0x01 (executing) in the result field depending on the execution status , 0x02 (suspended), 0x03 (aborting) code value, physical_volume_number, logical_volume_number field is the number of the volume where the file is recorded, media_generation_count field is the generation count value of the volume, start_offset , file_path_length and file_path fields are set with the offset value specified by the control command and the path name of the file, and the sent_size field is set with the number of bytes of data already output and sent to the controller.

  As described above, by using the SEND FILE PARTIAL Control command and the Status command, the controller can cause the camera storage to output a part of the file data, and can know the status during the output.

(Example 2)
The partial recording of file data in the present invention will be described below. In the present invention, a device in which a function of partial recording is added to the AV / C Camera Storage subunit is used as a device for recording a file.

  FIG. 5 shows the format of the RECEIVE FILE PARTIAL Control command and response for partially recording the file data of the present invention.

  Each field except the start_offset and receive_size fields in the command frame has the same meaning and use as the field of the same name in the above-mentioned RECEIVE FILE Control command frame.

  The start_offset field is a field for designating from which position of the designated file the data is recorded, and designates the offset from the top of the file by the number of bytes. If the value set in this field indicates a position that does not exist on the file, the Camera Storage subunit rejects the command by sending a REJECTED response to the command. For example, if the specified file size is 1024 bytes and start_offset is set to 2048, a REJECTED response is sent. If the start_offset field is set to zero and the specified file does not exist, the Camera Storage subunit may create the specified file on the specified volume and record the input data.

  The receive_size field specifies how many bytes of data are recorded from the specified offset position. When the camera storage subunit finishes recording the specified number of bytes, it sets the number of bytes of the actually recorded data in the received_size field of the response frame and sends an ACCEPTED response to the controller. In addition, if recording is interrupted by a control command with "abort" set in the subfunction field, or if data transfer is interrupted due to a transmission path error, the Camera Storage subunit sets the amount of data that can actually be recorded. And send a REJECTED response to the controller.

  A procedure for the controller to rewrite the thumbnail area of the image file shown in FIG. 2 will be described below. It is assumed that this file is recorded with the file name “root.image.jpg” of the volume with physical_volume_number = 0 and logical_volume_number = 0.

  The controller uses the ALLOCATE and ATTACH commands for the AV / C unit including the Camera Storage subunit and the AV / C unit including the Camera Storage subunit using the ALLOCATE and ATTACH commands as in the procedure shown in FIG. Connect Asynchronous Input Plug [0]. The Subunit Destination Plug [0] of the Camera Storage subunit and the Asynchronous Input Plug [0] of the AV / C unit are internally connected within the unit, and the logical connection between the controller and the Camera Storage subunit is shown in FIG. The connection shown in After setting the connection, the controller transmits a RECIEVE FILE PARTIAL Control command shown in FIG. 6 to the Camera Storage subunit. After receiving the command, the Camera Storage subunit sends an INTERIM response to the controller, and then receives data from the controller that is the producer according to the AV / C Asynchronous Serial Bus Connections procedure, and is specified from the specified offset. Record the number of bytes and send an ACCEPTED response of RECEIVE FILE PARTIAL. The controller that has received the response releases the connection between the controller and the AV / C unit using the DETACH and RELEASE commands.

  An example in which the controller rewrites the footer area of the image file shown in FIG. 2 is shown below. After setting the connection shown in FIG. 29 using the ALLOCATE and ATTACH commands as described above, the controller transmits the RECIEVE FILE PARTIAL Control command shown in FIG. After receiving the command, the Camera Storage subunit sends an INTERIM response to the controller, and then receives data from the controller that is the producer according to the AV / C Asynchronous Serial Bus Connections procedure, and is specified from the specified offset. Records byte data. In this example, the value of start_offset plus receive_size is larger than the size of the specified file. The Camera Storage subunit rewrites the data at the end of the specified file, and then records the input data added to the end of the file. Finally, the file becomes a file having the size shown in FIG.

  Next, FIG. 9 shows the format of the RECEIVE FILE PARTIAL Status command and response. This command is used to inquire about the execution status of the RECEIVE FILE PARTIAL Control command.

  The destination_plug field of the command frame specifies the Subunit destination plug number of the Camera Storage subunit.

  If the Camera Storage subunit that received the Status command has not executed the RECEIVE FILE PARTIAL Control command using the specified destination plug, 0xFF is set in the subfunction, physical_volume_number, logical_volume_number, and media_generation_count fields of the response frame. Set 0x00 (not executing) in the field and send it to the controller. In this case, the response frame does not include operand [5] and later.

  When the RECEIVE FILE PARTIAL Control command using the specified destination plug is being executed, the subfunction of the control command being executed is displayed in the subfunction field of the response frame, and 0x01 (executing) in the result field depending on the execution status , 0x02 (suspended), 0x03 (aborting) code value, physical_volume_number, logical_volume_number field is the number of the volume where the file being recorded exists, media_generation_count field is the volume generation count value, start_offset, file_path_length, The offset value specified by the control command and the path name of the file are set in the file_path field, and the number of bytes of data already recorded is set in the received_size field and sent to the controller.

  As explained above, by using the RECEIVE FILE PARTIAL Control command and Status command, the controller can rewrite part of the file data recorded on the Camera Storage recording medium and add data. You can also know the situation during recording.

The figure which shows the format of a SEND FILE PARTIAL Control command and a response. The figure which shows the structural example of an image file. The figure which shows the data example of the SEND FILE PARTIAL Control command and response for acquiring the header area | region of an image file. The figure which shows the format of a SEND FILE PARTIAL Status command and a response. The figure which shows the format of a RECEIVE FILE PARTIAL Control command and a response. The figure which shows the data example of the RECEIVE FILE PARTIAL Control command for rewriting the thumbnail area of an image file, and a response. The figure which shows the data example of the RECEIVE FILE PARTIAL Control command for rewriting the footer area | region of an image file, and a response. The figure which shows the structural example of the image file after rewriting a footer area | region. The figure which shows the format of a RECEIVE FILE PARTIAL Status command and a response. The figure which shows the command frame format used by CTS. The figure which shows the response frame format used by CTS. The figure which shows the basic transaction procedure between a controller and the conventional Camera Storage subunit. The figure which shows the format of a VERSION Status command and a response. The figure which shows the format of a MEDIA INFO Control command and a response. The figure which shows the format of a VOLUME INFO Control command and a response. The figure which shows the format of the attribute field of a VOLUME INFO Control response. The figure which shows the format of a FILE LIST Control command and a response. The figure which shows the format of the attribute field of a FILE LIST Control response. The figure which shows the format of the directory entry which comprises a file list. The figure which shows the format of attribute_byte of a directory entry. The figure which shows the structural example of the file data recorded on the recording medium of a Camera Storage subunit. The figure which shows the data example set to a FILE LIST Control command frame, and a part of directory entry contained in a file list. The figure which shows the data example set to a FILE LIST Control command frame, and a part of directory entry contained in a file list. The figure which shows the transaction procedure in the case of acquiring file data from a Camera Storage subunit. The figure which shows the format of a SEND FILE Control command and a response. The figure which shows the example of a logical connection between a controller and Camera Storage subunit when acquiring file data from a Camera Storage subunit. The figure which shows the transaction procedure in the case of transmitting file data to a Camera Storage subunit. The figure which shows the format of a RECEIVE FILE Control command and a response. The figure which shows the logical connection example between a controller and Camera Storage subunit in the case of transmitting file data to a Camera Storage subunit. The table | surface which shows the value of the ctype field set to the command frame of CTS. The table | surface which shows the value of the response field set to the response frame of CTS. A table showing profile values for the Camera Storage subunit. The table which shows the value of the subfunction field in the Control command of Camera Storage subunit. The figure which shows the file_type field value of a FILE LIST Control command. The figure which shows the value of receive_mode of RECEIVE FILE Control command. The figure which shows the value of file_type of RECEIVE FILE Control command.

Claims (16)

  A digital device comprising a digital interface for transmitting and receiving serial data, performing transmission and reception of control signals and digital data via the digital interface, and handling digital data on the recording medium using a randomly accessible recording medium And outputting information indicating a path name of a file for designating data recorded on the recording medium, information indicating an area in which the file is recorded, and data of the recorded file A digital apparatus that receives a control signal including path information for specifying the file data and an output start position of the file data, and outputs the specified data using an asynchronous transaction.   2. The digital apparatus according to claim 1, wherein if the position corresponding to the output start position of the designated file data does not exist in the file data designated by the control signal, the control signal is rejected.   The digital device according to claim 1, wherein the control signal includes information specifying a data amount to be output.   When the data amount from the output start position of the designated file to the end data of the designated file is larger than the designated data amount, the designated amount of data is output. The digital device according to claim 3.   When the amount of data from the output start position of the specified file to the end data of the specified file is smaller than the data amount to be output, the file specified from the output start position of the specified file 4. The digital device according to claim 3, wherein the data up to the last data of is output.   4. The digital apparatus according to claim 3, wherein after the control signal is received and data is output, a response signal including information indicating the amount of data actually output is transmitted.   In the middle of outputting data according to the received control signal, it receives a control signal that inquires about the state of data output, and includes information indicating the amount of data that has already been output when the inquiry control signal is received The digital apparatus according to claim 1, wherein a response signal is transmitted.   A digital device comprising a digital interface for transmitting and receiving serial data, performing transmission and reception of control signals and digital data via the digital interface, and handling digital data on the recording medium using a randomly accessible recording medium The path information for inputting the data, the information for specifying the area for recording the input data, the information indicating the path name for specifying the file for recording the input data, and the A digital apparatus that receives a control signal including information for designating a recording start position of a designated file and records data input from the designated path using an Asynchronous transaction.   9. The digital apparatus according to claim 8, wherein when the designated file exists in the designated area, the data input after the recording start position of the designated file is overwritten and recorded.   The overwriting recording of the data input to the specified file is performed, and after the overwriting of the data at the end of the file is over, the input data is additionally recorded from the end of the specified file, The digital device according to claim 9.   When the specified file exists in the specified area and the recording start position of the specified file is met at the end of the file, the input data is additionally recorded from the end of the specified file. The digital device according to claim 8, wherein the digital device is characterized.   9. The digital apparatus according to claim 8, wherein when the designated file does not exist in the designated area, the designated file is created and data is recorded in the created file.   9. The digital apparatus according to claim 8, wherein when the position corresponding to the recording start position of the designated file does not exist in the file data designated by the control signal, the control signal is rejected.   9. The digital apparatus according to claim 8, wherein the control signal includes information specifying an input data amount.   9. The digital apparatus according to claim 8, wherein after the control signal is received and data is recorded, a response signal including information indicating the actually recorded data amount is transmitted.   In the middle of recording data according to the received control signal, the control signal for inquiring about the state of data recording is received, and information indicating the amount of data that has already been recorded when the inquiry control signal is received is included. 9. The digital apparatus according to claim 8, wherein a response signal is transmitted.

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