JP2005286366A - Method and apparatus for dividing / merging files - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for dividing / merging files capable of effectively utilizing the capacity of a recording medium by efficiently eliminating ineffective data allocated in the case of dividing an MPEG format system stream file. <P>SOLUTION: The file dividing / merging apparatus is provided with: a cluster border information acquisition section 204; a GOP border information acquisition section 202: a division file generating section 207; a head padding part generating section 206; a padding information generating section 205 for generating information of a padding part; and a padding part eliminating section 208 for eliminating the padding part on the basis of information recorded in the padding part, the padding parts allocated at file division are configured with one or more private stream packets, information of the padding parts allocated at division is arranged in the packets, and the padding parts are efficiently eliminated on the basis of the information in the padding parts in a prescribed timing to effectively utilize the capacity of the recording medium. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a file division and combination method and apparatus for dividing and combining digital video and audio data recorded in a recording medium as a compressed digital file and compressed in MPEG format.

  A conventional method and apparatus for dividing a digital video / audio data file compressed in MPEG format (MPEG format system stream file) and dividing the file at a cluster boundary which is the minimum unit of recording on a recording medium. The file is edited in MPEG GOP (Group Of Picture) units to form an MPEG system stream file. At that time, an open portion from the file head (cluster boundary) to the first GOP boundary in the latter half of the divided file is used as a padding packet (see, for example, Patent Document 1).

In FIG. 21, 2101 is the position of the currently displayed image, 2102, 2104, 2106, and 2110 are cluster boundaries, 2103 is the beginning of the GOP that contains the image that is currently displayed, 2105 is the end of file A, and 2107 is after division. The end of file B in the first half, 2108 is the leading end of file C in the second half after splitting, 2109 is the beginning of the first GOP in file C in the second half after splitting, and 2111 is the end of file C in the second half after splitting. If there is an instruction to divide the file A at the position 2101 of the currently displayed image, the head 2103 of the GOP that includes the currently displayed image is searched, and the cluster boundary 2102 and the currently displayed image are included. Padding packets having a size up to the beginning 2103 of the GOP are arranged from the leading end 2108 of the second half of the divided file C to the beginning 2109 of the first GOP of the second half of the divided file C to construct the second half file C after the division.
Japanese Patent Laid-Open No. 11-176083 (2-4 Mitsugu, Fig. 9)

  However, in the conventional configuration, when an MPEG system stream file is divided, invalid data is transferred to the file by setting the MPEG GOP boundary from the leading cluster boundary to the padding packet in the latter half of the divided file. Therefore, there is a problem that the capacity in the recording medium cannot be effectively used.

  Also, when combining MPEG system stream files, in the conventional configuration, invalid data is stored in the file by using the cluster boundary as a padding packet from the end GOP boundary of the first half of the file to be combined. Therefore, there is a problem that the capacity in the recording medium cannot be effectively used.

  Furthermore, if the division and combination of the MPEG system stream file are repeated, a plurality of padding packets may be placed in the file, and the ratio of invalid data in the file increases. There was a problem that it could not be used effectively.

  For example, when the recording medium is an SD memory card, in the current SD file system, the cluster size, which is the minimum control unit of the file system, is determined according to the capacity of the SD memory card. For example, for a 512 megabyte SD memory card, 1 cluster = 16 kilobytes, and for a 1 gigabyte SD memory card, 1 cluster = 32 kilobytes. Since the packet boundary in the SD Video standard is in units of 2 kilobytes, the GOP boundary is arranged at least on the 2 kilobyte boundary. Therefore, if it is a 512 megabyte SD memory card, the padding packet size inserted by one division is 2 to 14 kilobytes (average 8 kilobytes), and if it is a 1 gigabyte SD memory card, the padding inserted by division is The packet size is 2 to 30 kilobytes (average 16 kilobytes). For example, when dividing (combining) 100 times, insert a 1.6-megabyte padding packet (invalid data = garbage) with a 512-megabyte SD memory card and an 800-kilobyte, 1-gigabyte SD memory card. become. A 1.6-megabyte padding packet (invalid data = trash) is a low-rate still image (about 32 kilobytes) and corresponds to a data amount of about 50 sheets.

  The present invention has been made in order to solve the above-described conventional problems, and effectively deletes invalid data arranged when dividing or combining MPEG system stream files, and records the data in the recording medium. An object of the present invention is to provide a file splitting and combining method and apparatus capable of effectively utilizing the capacity of the file.

  In order to solve the above-described problem, a file division / combination method according to claim 1 of the present invention uses digital video / audio data compressed in MPEG format recorded on a randomly accessible recording medium as a compressed digital file, and Boundary information in GOP (Group Of Picture) unit which is the minimum reproduction unit of the compressed digital file in a file division combination method for dividing or combining the compressed digital file at a cluster boundary which is a minimum unit of recording on the recording medium When dividing the compressed digital file, in the second half of the compressed digital file after division, the empty portion from the beginning of the second half of the compressed digital file after division to the beginning GOP boundary is padded to the beginning of the file. And the compressed digital file in the padding portion at the beginning of the file. Information related to the padding part is recorded, and at a predetermined timing, the padding part of the compressed digital file is deleted based on the information recorded in the file head padding part.

  According to a second aspect of the present invention, there is provided a file division / combination method in which digital video / audio data compressed in an MPEG format recorded on a randomly accessible recording medium is used as a compressed digital file, and the minimum recording of the recording medium is performed. In a file division / combining method for dividing or combining the compressed digital files at a cluster boundary which is a unit, boundary information is acquired in units of GOP (Group Of Picture) which is a minimum unit for reproducing the compressed digital file, and the compression is performed. When combining digital files, in the first half of the compressed digital files to be combined, the empty part from the end GOP boundary of the first half of the compressed digital files to be combined to the second half of the compressed digital file is defined as a file intermediate padding section. , One class at the beginning of the compressed digital file to be combined A file head padding part configured according to the file size is added, information related to the padding part of the compressed digital file is recorded in the file head padding part, and based on the information recorded in the file head padding part at a predetermined timing The padding part of the compressed digital file is deleted.

  According to a third aspect of the present invention, there is provided the file division / combination method according to the first or second aspect, wherein the padding section is composed of one or a plurality of MPEG private stream packets. The information on the padding portion in the head padding portion includes ID information for identifying the padding portion, free space information of the recording medium necessary for deleting the padding portion, the total number of padding portions, and padding from the beginning of the file. It is composed of offset information to the part start point, offset information from the beginning of the file to the padding part end point, and information on whether or not it is a one-cluster size padding part.

  A file division / combination method according to claim 4 of the present invention is the file division / combination method according to claim 3, wherein the free space of the recording medium necessary for deleting the padding portion is the compressed digital file. Is equal to the data size value excluding the padding part.

  The file division / combination method according to claim 5 of the present invention is the file division / combination method according to any one of claims 1 to 3, wherein the padding portion of the compressed digital file is deleted at the head. The information regarding the padding part in the padding part is characterized in that it is performed only when the free capacity of the recording medium necessary for deleting the padding part is smaller than the current free capacity of the recording medium.

  A file division / combination method according to claim 6 of the present invention is the file division / combination method according to claim 1 or 2, wherein the predetermined timing is different from the compressed digital file to which the padding unit is added. It is the timing to combine with the compressed digital file.

  A file division / combination method according to claim 7 of the present invention is the file division / combination method according to claim 1, 2, or 6, wherein the padding portion of the compressed digital file is deleted by the padding. When combining a compressed digital file with a part added with another compressed digital file, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, and is combined into a file to be combined This is performed by adding writing.

  According to an eighth aspect of the present invention, there is provided the file division / combination method according to the first or second aspect, wherein the compressed digital file to which the padding unit is added is reproduced at the predetermined timing. It is the timing to perform.

  The file division / combination method according to claim 9 of the present invention is the file division / combination method according to claim 1, 2, or 8, wherein the padding portion of the compressed digital file is deleted by the padding. When a compressed digital file with a copy is played back, only the data excluding the padding portion from the compressed digital file with the padding portion is read from the recording medium, and a new temporary compressed digital file is created and created. The read data is written and added to the temporary compressed digital file, and playback is performed up to the end of the compressed digital file to which the padding unit is added, and the data is transferred to the end of the compressed digital file to which the padding unit is added. After writing is added, the compressed digital with the padding part added Remove the Airu, the performed by changing the file name of the temporary compressed digital file in the same file name as the additional compressed digital file of the padding portion, it is characterized in.

  The file division / combination method according to claim 10 of the present invention is the file division / combination method according to claim 1 or 2, wherein the predetermined timing is the compressed digital file to which the padding unit is added, It is a timing to copy to a recording medium different from the recording medium.

  The file division / combination method according to claim 11 of the present invention is the file division / combination method according to claim 1, claim 2, or claim 10, wherein the padding portion of the compressed digital file is deleted by the padding. When copying the compressed digital file with the added portion to a recording medium different from the recording medium, only the data excluding the padding portion from the compressed digital file with the padding portion is read from the recording medium, Creating a file with the same name as the compressed digital file to which the padding unit is added in the other recording medium, and writing and adding the read data to the created compressed digital file with the same name, To do.

  The file division / combination method according to claim 12 of the present invention is the file division / combination method according to claim 1 or 2, wherein a cleanup of the randomly accessible recording medium is instructed at the predetermined timing. It is characterized by the fact that the timing has been set.

  The file division / combination method according to claim 13 of the present invention is the file division / combination method according to claim 1, claim 2, or claim 12, wherein the padding portion of the compressed digital file is deleted randomly. When instructed to clean up an accessible recording medium, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, and a new temporary compressed digital file is created, The read data is written and added to the created temporary compressed digital file, and after the data is written and added to the end of the compressed digital file to which the padding portion is added, the compressed digital file to which the padding portion is added is deleted. The file name of the temporary compressed digital file Carried out by changing the same file name as the additional compressed digital file of the ring portion, it is characterized in.

  The file division / combination method according to claim 14 of the present invention is the file division / combination method according to claim 13, wherein deletion of the padding portion of the compressed digital file is performed by adding the padding portion to the recording medium. If there are a plurality of compressed digital files, the free space of the recording medium required for deleting the padding part in the information related to the padding part in the head padding part in each compressed digital file is compared, and the free capacity Is deleted from the smallest.

  Further, the file division / combination method according to claim 15 of the present invention is the file division / combination method according to claim 2, wherein a file head padding portion already exists at the head of the first half of the compressed digital file to be combined. The information of the padding part added at the time of combination is additionally recorded in the existing file head padding part without newly adding a file head padding part.

  The file division / combination method according to claim 16 of the present invention is the file division / combination method according to claim 15, wherein a file head padding portion already exists at the head of the latter half of the compressed digital file to be combined. The information of the padding part to be additionally recorded includes not only the information of the padding part added at the time of combining, but also the information of the padding part in the file head padding part of the latter half of the compressed digital file to be combined. It is a feature.

  The file division / combination method according to claim 17 of the present invention is the file division / combination method according to claim 15, wherein the first file head padding portion of the latter half of the compressed digital file to be joined is a one-cluster size padding portion. In this case, the information of the padding part to be additionally recorded includes not only the information of the padding part added at the time of combining, but also the information of the padding part in the file leading padding part in the latter half of the compressed digital file to be combined. In addition, the latter half file top padding portion of the compressed digital file to be combined is deleted.

  In the file dividing / combining method according to claim 18 of the present invention, the digital video / audio data compressed in the MPEG format recorded on a randomly accessible recording medium is used as a compressed digital file, and the minimum recording of the recording medium is performed. In a file division / combining method for dividing or combining the compressed digital files at a cluster boundary which is a unit, the boundary information is acquired in units of MPEG GOP (Group Of Picture) which is the minimum unit for reproducing the compressed digital file, When dividing the compressed digital file, in the second half of the compressed digital file after the division, an empty portion from the beginning of the second half of the compressed digital file to the beginning GOP boundary is used as a padding section, and the recording medium An information file is created in the file, and the padding is added to the created information file. The information about the copy is recorded, and the padding portion of the compressed digital file is deleted based on the information recorded in the information file at a predetermined timing.

  According to a nineteenth aspect of the present invention, there is provided a file division / combination method in which digital video / audio data recorded in a randomly accessible recording medium and compressed in MPEG format is a compressed digital file, and the minimum recording of the recording medium is performed. In a file division / combining method for dividing or combining the compressed digital files at a cluster boundary which is a unit, boundary information is acquired in units of GOP (Group Of Picture) which is a minimum unit for reproducing the compressed digital file, and the compression is performed. When combining digital files, in the first half of the compressed digital files to be combined, the padding portion is a free part from the end GOP boundary of the first half of the compressed digital files to be combined to the second half of the compressed digital file to be combined, Create an information file in the recording medium, and create the information file The information on the padding part is recorded in a file, and the padding part of the compressed digital file is deleted based on the information recorded in the information file at a predetermined timing.

  A file division / combination method according to claim 20 of the present invention is the file division / combination method according to claim 18 or claim 19, wherein the information file already exists in the recording medium. Information relating to the padding part is additionally recorded in the existing information file without creating an information file.

  A file division / combination method according to claim 21 of the present invention is the file division / combination method according to claim 18 or 19, wherein the padding section is composed of one or a plurality of MPEG format padding packets. The information related to the padding portion recorded in the information file is to delete the padding portion for each information on the total number of files in which the padding portion exists, information for identifying the file in which the padding portion exists, and information for identifying the file. Free space information required for the recording medium, the total number of padding parts, offset information from the beginning of the file to the padding part start point, and offset information from the beginning of the file to the padding part end point. It is what.

  A file division / combination method according to claim 22 of the present invention is the file division / combination method according to claim 21, wherein the free space of the recording medium required to delete the padding portion is the compressed digital file. Is equal to the data size value excluding the padding part.

  The file division / combination method according to claim 23 of the present invention is the file division / combination method according to claim 18, 19 or 21, wherein the padding portion of the compressed digital file is deleted by the information. In the information on the padding part in the file, only when the free capacity of the recording medium necessary for deleting the padding part is smaller than the free capacity of the current recording medium, .

  The file division / combination method according to claim 24 of the present invention is the file division / combination method according to claim 18 or 19, wherein the predetermined timing is different from the compressed digital file to which the padding unit is added. It is the timing to combine with the compressed digital file.

  A file division / combination method according to claim 25 of the present invention is the file division / combination method according to claim 18, 19 or 24, wherein the padding portion of the compressed digital file is deleted by the padding. When combining a compressed digital file with a portion added with another compressed digital file, only the data excluding the padding portion from the compressed digital file with the padding portion is read from the recording medium, and is combined into a file to be combined. This is performed by adding writing.

  The file division / combination method according to claim 26 of the present invention is the file division / combination method according to claim 18 or 19, wherein the predetermined timing reproduces the compressed digital file to which the padding section is added. It is the timing to perform.

  A file division / combination method according to claim 27 of the present invention is the file division / combination method according to claim 18, 19 or 26, wherein the padding portion of the compressed digital file is deleted by the padding. When a compressed digital file with a copy is played back, only the data excluding the padding portion from the compressed digital file with the padding portion is read from the recording medium, and a new temporary compressed digital file is created and created. The read data is written and added to the temporary compressed digital file, and playback is performed until the end of the compressed digital file with the padding portion added, and the data is received up to the end of the compressed digital file with the padding portion added. After writing is added, compression with padding added Remove the digital file, the performed by changing the file name of the temporary compressed digital file in the same file name as the additional compressed digital file of the padding portion, it is characterized in.

  The file division / combination method according to claim 28 of the present invention is the file division / combination method according to claim 18 or 19, wherein the predetermined timing is the compressed digital file to which the padding unit is added, It is the timing for copying to a recording medium different from the recording medium.

  A file division / combination method according to claim 29 of the present invention is the file division / combination method according to claim 18, 19 or 28, wherein the padding portion of the compressed digital file is deleted by the padding. When copying the compressed digital file with the added portion to a recording medium different from the recording medium, only the data excluding the padding portion from the compressed digital file with the padding portion is read from the recording medium, Creating a file with the same name as the compressed digital file to which the padding unit is added in the other recording medium, and writing and adding the read data to the created compressed digital file with the same name, To do.

  The file division / combination method according to claim 30 of the present invention is the file division / combination method according to claim 18 or claim 19, wherein the predetermined timing is directed to clean up the randomly accessible recording medium. It is characterized by the fact that the timing has been set.

  The file division / combination method according to claim 31 of the present invention is the file division / combination method according to claim 18, claim 19, or claim 30, wherein the padding portion of the compressed digital file is deleted randomly. When instructed to clean up an accessible recording medium, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, and a temporary compressed digital file is newly created. The read data is written and added to the created temporary compressed digital file, and the data is written and added to the end of the compressed digital file to which the padding portion is added, and then the compressed digital file to which the padding portion is added is deleted. The file name of the temporary compressed digital file Carried out by changing the same file name as the additional compressed digital file of the loading unit, it is characterized in.

  A file division / combination method according to a thirty-second aspect of the present invention is the file division / combination method according to the thirty-first aspect, wherein deletion of a padding portion of the compressed digital file is performed by adding the padding portion to the recording medium. If there are a plurality of compressed digital files, the free space of the recording medium required for deleting the padding part for each compressed digital file is compared in the information related to the padding part in the information file, Deletion is performed from the one with the smallest capacity.

  According to a thirty-third aspect of the present invention, there is provided a file division / concatenation apparatus according to a thirty-third aspect of the present invention, wherein the digital video / audio data compressed in the MPEG format is a compressed digital file and the compressed digital file is divided or combined. A randomly accessible recording medium for storing the compressed digital file; cluster boundary information acquiring means for acquiring boundary information of a cluster which is a minimum recording unit of the recording medium; and a GOP which is the minimum unit for reproducing the compressed digital file. GOP boundary information acquisition means for acquiring boundary information in units of (Group Of Picture), cluster boundary information acquired by the cluster boundary information acquisition means, and a split file based on GOP boundary information acquired by the GOP boundary information acquisition means Split file generation means for generating A head padding section generating means for generating a free part from the head of the second half of the compressed digital file to the head GOP boundary as a file head padding section, and generating information related to the padding section of the compressed digital file in the file head padding section And a padding part deleting means for deleting the padding part of the compressed digital file based on the information recorded in the file head padding part.

  According to a thirty-fourth aspect of the present invention, there is provided a file division / concatenation apparatus according to claim 34, wherein the digital video / audio data compressed in the MPEG format is a compressed digital file, and the compressed digital file is divided or combined. A randomly accessible recording medium for storing the compressed digital file; a cluster combining means for combining the compressed digital file at a cluster boundary which is a minimum recording unit of the recording medium; and a minimum unit for reproducing the compressed digital file. GOP boundary information acquisition means for acquiring boundary information in a certain GOP (Group Of Picture) unit, and an empty part from the end GOP boundary of the compressed digital file of the first half to be combined to the compressed digital file of the second half to be combined Intermediate padding generated as file intermediate padding part Information relating to the padding part of the compressed digital file in the file heading padding part, the heading padding part generating part for generating and adding a file heading padding part composed of one cluster size at the head of the compressed digital file to be combined And a padding part deletion means for deleting a padding part of the compressed digital file based on information recorded in the file head padding part. .

  The file division / combination device according to claim 35 of the present invention is the file division / combination device according to claim 33 or claim 34, wherein the padding part deleting means stores the compressed digital file to which the padding part is added. When the timing for combining with another compressed digital file is detected, only the data obtained by removing the padding portion from the compressed digital file with the padding portion added based on the information recorded in the file head padding portion is recorded on the recording medium. And the data read from the recording medium is written to the other compressed digital file which is a combination destination.

  The file division / combination device according to claim 36 of the present invention is the file division / combination device according to claim 33 or claim 34, wherein the padding part deleting means stores the compressed digital file to which the padding part is added. When the playback timing is detected, only the data excluding the padding portion from the compressed digital file to which the padding portion has been added is read from the recording medium based on the information recorded in the head padding portion of the file. A compressed digital file is created, data read from the recording medium is written and added to the created temporary compressed digital file, playback is performed up to the end of the compressed digital file to which the padding unit is added, and the padding unit Data up to the end of the attached compressed digital file After the writing is added, the compressed digital file to which the padding unit is added is deleted, and the file name of the temporary compressed digital file is changed to the same file name as the compressed digital file to which the padding unit is added. It is what.

  A file division / combination apparatus according to claim 37 of the present invention is the file division / combination apparatus according to claim 33 or claim 34, wherein the padding section deleting means stores the compressed digital file to which the padding section is added. When the timing for copying to a recording medium different from the recording medium is detected, data obtained by removing the padding portion from the compressed digital file to which the padding portion is added based on the information recorded in the file head padding portion Is read from the recording medium, a file with the same name as the compressed digital file with the padding portion is created in the other recording medium, and the data read from the recording medium is added to the created compressed digital file. It is characterized by that.

  The file division coupling apparatus according to a thirty-eighth aspect of the present invention is the file division coupling apparatus according to the thirty-third or thirty-fourth aspect, wherein the padding section deleting means cleans up the randomly accessible recording medium. When the instructed timing is detected, only the data excluding the padding part from the compressed digital file added with the padding part is read from the recording medium based on the information recorded in the head padding part of the file, and newly Create a temporary compressed digital file, add the data read from the recording medium to the created temporary compressed digital file, add the data until the end of the compressed digital file to which the padding unit was added, Compressed digital file with padding added Delete, change the file name of the temporary compressed digital file in the same file name as the additional compressed digital file of the padding portion, it is characterized in.

  The file division / combination device according to claim 39 of the present invention is the file division / combination device according to claim 38, wherein the padding part deleting means is a compressed digital file in which the padding part is added to the recording medium. If there are a plurality of recording media, the free space of the recording medium required to delete the padding portion in the information about the padding portion in the head padding portion of each compressed digital file is compared, and the padding is started from the one with the smallest free space. This is characterized in that a part is deleted.

  According to a 40th aspect of the present invention, there is provided a file division / concatenation apparatus according to claim 40, wherein the digital video / audio data compressed in the MPEG format is a compressed digital file, and the compressed digital file is divided or combined. A randomly accessible recording medium for storing the compressed digital file; cluster boundary information acquiring means for acquiring boundary information of a cluster which is a minimum recording unit of the recording medium; and a GOP which is the minimum unit for reproducing the compressed digital file. GOP boundary information acquisition means for acquiring boundary information in units of (Group Of Picture), cluster boundary information acquired by the cluster boundary information acquisition means, and a split file based on GOP boundary information acquired by the GOP boundary information acquisition means Split file generation means for generating Information for creating an information file for recording information related to the padding portion in the recording medium, and a head padding portion generating means for generating an empty portion from the head of the compressed digital file of the latter half portion to the head GOP boundary as a padding portion A file creation means; a padding information generation means for generating information related to a padding portion of the compressed digital file in the information file; and a padding portion of the compressed digital file is deleted based on information recorded in the information file. And a padding section deleting means.

  According to a 41st aspect of the present invention, there is provided a file division / concatenation apparatus according to claim 41, wherein the digital video / audio data compressed in the MPEG format is a compressed digital file, and the compressed digital file is divided or combined. A random-accessible recording medium for storing the compressed digital file; a cluster combining means for combining the compressed digital files at a cluster boundary which is a minimum recording unit of the recording medium; and a minimum unit for reproducing the compressed digital file. GOP boundary information acquisition means for acquiring boundary information in a certain GOP (Group Of Picture) unit, and an empty part from the end GOP boundary of the compressed digital file of the first half to be combined to the compressed digital file of the second half to be combined Intermediate padding unit generating means for generating as a padding unit; An information file creating means for creating an information file for recording information relating to the padding portion in the recording medium; a padding information generating means for creating information relating to the padding portion of the compressed digital file in the information file; and the information file And a padding part deleting means for deleting the padding part of the compressed digital file based on the information recorded therein.

  A file division / combination device according to claim 42 of the present invention is the file division / combination device according to claim 40 or claim 41, wherein the padding part deleting means stores the compressed digital file to which the padding part is added. When detecting the timing of combining with another compressed digital file, only the data obtained by removing the padding portion from the compressed digital file to which the padding portion is added based on the information about the padding portion recorded in the information file. Reading from the recording medium and writing the data read from the recording medium to the other compressed digital file that is a combination destination.

  The file division / combination device according to claim 43 of the present invention is the file division / combination device according to claim 40 or claim 41, wherein the padding part deleting means stores the compressed digital file to which the padding part is added. When detecting the reproduction timing, only the data excluding the padding part from the compressed digital file to which the padding part is added based on the information about the padding part recorded in the information file is read from the recording medium, A new temporary compressed digital file is created, the data read from the recording medium is written and added to the created temporary compressed digital file, playback is performed up to the end of the compressed digital file to which the padding unit is added, and End of compressed digital file with padding added After the data is written and added, the compressed digital file to which the padding part is added is deleted, and the file name of the temporary compressed digital file is changed to the same file name as the compressed digital file to which the padding part is added. It is characterized by this.

  A file division / combination device according to claim 44 of the present invention is the file division / combination device according to claim 40 or claim 41, wherein the padding part deleting means stores the compressed digital file to which the padding part is added. When a timing for copying to a recording medium different from the recording medium is detected, a padding unit is extracted from the compressed digital file to which the padding unit is added based on information related to the padding unit recorded in the information file. Read only the removed data from the recording medium, create a file with the same name as the compressed digital file with the padding portion added in the other recording medium, and read the created compressed digital file with the same name from the recording medium It is characterized by writing and adding data.

  In addition, the file division coupling apparatus according to claim 45 of the present invention is the file division coupling apparatus according to claim 40 or claim 41, wherein the padding section deleting means cleans up the randomly accessible recording medium. When the instructed timing is detected, only the data obtained by removing the padding portion from the compressed digital file added with the padding portion is read from the recording medium based on the information about the padding portion recorded in the information file. A new temporary compressed digital file is created, data read from the recording medium is written and added to the created temporary compressed digital file, and data is written and added to the end of the compressed digital file to which the padding portion is added After that, the compressed digital to which the padding part is added Remove the Le file, change the file name of the temporary compressed digital file in the same file name as the additional compressed digital file of the padding portion, it is characterized in.

  A file division / combination apparatus according to a 46th aspect of the present invention is the file division / combination apparatus according to the 45th aspect, wherein the padding section deleting means is a compressed digital file in which the padding section is added to the recording medium. When there are a plurality of the recording media, the free space of the recording medium necessary for deleting the padding portion in the information related to the padding portion in the information file is compared, and the padding portion is deleted from the one having the small free space It is characterized by that.

  As described above, according to the file division coupling method and apparatus according to the present invention, invalid data (padding part) arranged when dividing an MPEG system stream file is converted into one or more MPEG formats. Based on the information related to the padding part recorded in the private stream packet at a predetermined timing, and recording information related to the padding part arranged at the time of the division in the private stream packet Thus, the padding part is deleted, so that the padding part can be efficiently deleted and the capacity in the recording medium can be effectively utilized.

  Further, according to the file division and combination method and apparatus according to the present invention, invalid data (padding part) arranged when combining MPEG system stream files is converted into a private stream in one or a plurality of MPEG formats. It is composed of packets, records information related to the padding part arranged at the time of combining in a private stream packet, and a padding part based on information related to the padding part recorded in the private stream packet at a predetermined timing Since the padding portion is deleted efficiently, the capacity in the recording medium can be effectively utilized.

  In addition, according to the file dividing / combining method and apparatus according to the present invention, an information file in which information on invalid data (padding part) arranged when dividing an MPEG system stream file is created in a recording medium Since the padding part is deleted based on the information related to the padding part recorded in the information file at a predetermined timing, the padding part can be used without analyzing the MPEG system stream file. It can be deleted efficiently and the capacity in the recording medium can be used effectively.

  In addition, according to the file division coupling method and apparatus according to the present invention, an information file in which information about invalid data (padding part) arranged when coupling MPEG system stream files is created in a recording medium Since the padding part is deleted based on the information related to the padding part recorded in the information file at a predetermined timing, the padding part can be used without analyzing the MPEG system stream file. It can be deleted efficiently and the capacity in the recording medium can be used effectively.

Embodiments of the present invention will be described below in detail with reference to the drawings.
(Embodiment 1)
Embodiment 1 of the present invention will be described below.
First, the concept of division processing of a digital video / audio data file compressed in MPEG format will be described with reference to FIGS.

  FIG. 1 is a file structure diagram accompanying division of a digital video / audio data file compressed in the MPEG format according to the first embodiment. In FIG. 1, a file before division is called file 1, a file in the first half after division is file 2, and a file in the latter half after division is file 3. Reference numeral 103 denotes the leading end of the file 1, 108 denotes the end of the file 1, and 104, 106, and 107 denote cluster boundaries of the file 1. Reference numeral 110 denotes the leading end of the file 2, 113 denotes the end of the file 2, and 111 and 114 denote cluster boundaries of the file 2. Reference numeral 116 denotes the leading end of the file 3, 120 denotes the end of the file 3, and 118 and 119 denote cluster boundaries of the file 3.

  Note that portions 113 to 114 (lower right hatched portions) represent unused areas, and portions 116 to 117 (upward right hatched portions) are added when the compressed digital video / audio data is divided. Represents the padding part.

  FIG. 2 is a block diagram of the file dividing / combining apparatus according to the first embodiment. In FIG. 2, 201 is an operation management control unit that manages control commands such as split and join of files and issues control commands to the relationship control unit, 202 is a GOP boundary information acquisition unit that acquires information about GOP boundary positions, and 203. Is a randomly accessible recording medium unit that stores a compressed digital file, 204 is a cluster boundary information acquisition unit that acquires information about the cluster boundary position, and 205 is padding information that generates information about a padding unit of the compressed digital file. A generation unit 206 generates a vacant part from the start of the file to the start GOP boundary as a file start padding unit, and 207 generates a file and moves and copies data when dividing the file. The divided file generation unit 208 for performing the above and the like, 208 is a file head padding unit It is a padding section deletion unit for deleting the padding portion of the compressed digital file based on information recorded in.

  FIG. 3 is a chart showing processing from the start of file division to the completion of file division in the first embodiment.

  When the operation management control unit 201 receives a file division instruction at the position 102 of the currently displayed image in the file 1, the digital video / audio data compressed in the MPEG format is normally reproduced after the division processing. In order to do this, division at an arbitrary point cannot be performed, and division at a GOP boundary is necessary. Therefore, first, the GOP boundary information acquisition unit 202 searches for the top 105 of the GOP including the image (division point) instructed to be divided (step 301), and the position information of the searched top 105 of the GOP is used as the cluster boundary. The information acquisition unit 204 is notified. The cluster boundary information acquisition unit 204 searches the boundaries 104 and 106 before and after the cluster including the top 105 of the GOP searched in step 301 (step 302).

  Next, the divided file generation unit 207 newly opens (creates) the file 3 that is the latter half of the file after the division (step 303), and the GOP head information 105 acquired by the GOP boundary information acquisition unit 202, It is checked whether or not the cluster boundary acquired by the cluster boundary information acquisition unit 204 matches (step 304).

  When the first 105 of the GOP and the cluster boundary coincide, the divided file generation unit 207 connects the data from the first 105 of the GOP to the end 108 of the file 1 to the file 3 and becomes the second half of the file after the division 3 is generated (step 308). After that, the data after the first 105 of the GOP of the file 1 is cut, and the sequence end code and end code are attached from the cut point (step 309), and the file 1 after the processing (the first half file after the division) is the file. 2 to finish the file division process. In the file 2, the position 112 corresponds to the position of the top 105 of the GOP in the file 1, and the sequence end code and the end code are arranged in an area from the position 112 to the end of the file 113.

  On the other hand, if the head 105 of the GOP and the cluster boundary do not match, first, the padding information generation unit 205 obtains the size from the head 105 of the GOP to the tip 104 of the cluster boundary, and uses the obtained size as the size of the padding part ( Step 305). Then, the head padding part generation unit 206 constructs the padding part at the head of the file 3 with the size obtained by the padding information generation part 205 (step 306). Next, the divided file generation unit 207 copies the data from the beginning 105 of the GOP to the end 106 of the cluster boundary to the end 117 of the padding portion of the file 3 (step 307). Further, the data from the end 106 of the cluster boundary to the end 108 of the file 1 is connected to the position 118 of the file 3 to generate the file 3 as the second half file after the division (step 308). After that, the data after the first 105 of the GOP of the file 1 is cut, and the sequence end code and end code are attached from the cut point (step 309), and the file 1 after the processing (the first half file after the division) is the file. 2 to finish the file division process. In the file 2, the position 112 corresponds to the position of the top 105 of the GOP in the file 1, and the sequence end code and end code are arranged from the position 112 to the end of the file 113.

  Next, the structure of digital video / audio data compressed in the MPEG format will be described with reference to FIGS.

  FIG. 4 is a diagram showing an MPEG ES (Elementary Stream) structure. In FIG. 4, 401 is a sequence header, 402 is a sequence end code, and 403, 404, and 405 are heads of GOPs. If the digital video / audio data compressed in the MPEG format is an ES in the MPEG format, the head of the GOP described in FIGS. 1 to 3 is the head of the GOP in FIG.

  FIG. 5 is a diagram showing an MPEG PES (Packetized Elementary Stream) structure. In FIG. 5, 501 is a packet, 502 is a packet header which is packet configuration data, and 503 is packet data which is packet configuration data. The packet data is composed of data obtained by dividing the ES in FIG. If the digital video / audio data compressed in the MPEG format is the PES in the MPEG format, the head of the GOP described in FIGS. 1 to 3 is the head of the packet in FIG.

  FIG. 6 is a diagram showing an MPEG PS (Program Stream) structure. In FIG. 6, 601 is the first pack, 602 is a pack other than the first pack, 603 is a pack header which is pack configuration data, 604 is a system header which is configuration data only for the first pack, and 605 is pack configuration data. Packet. The packet in FIG. 6 is configured by the PES in FIG. When the digital video / audio data compressed in the MPEG format is the PS in the MPEG format, the top of the GOP described in FIGS. 1 to 3 is the top of the pack in FIG.

  In the following embodiments, digital video / audio data compressed in MPEG format will be described using PS in MPEG format.

  Next, the structure of the padding unit generated by the head padding unit generation unit 206 will be described with reference to FIG. 7, and the padding information generation unit 205 and the processing for the head padding unit generation unit 206 to construct the padding unit will be described.

  FIG. 7 is a structural diagram of the padding unit generated by the head padding unit generation unit 206 according to the first embodiment. In FIG. 7, 701 is a head padding part, 702 is a compressed digital data part of the latter half part after division, 703 is a pack header in the head padding part, 704 is a system header, 705 is a packet in the head padding part, and 706 is a part after division. The leading end of the second half of the compressed digital file, 707 is the head of the second half of the GOP after splitting, 708 is the end of the second half of the compressed digital file after splitting, 709 is the packet header of the packet 705 in the top padding section, and 710 is the head Packet data of the packet 705 in the padding section, 711 is a start code in the packet header 709, 712 is a stream ID in the packet header 709, 713 is a packet length in the packet header 709, and 714 is packet identification information in the packet data 710 , 715 is the required free space information for deleting the padding part in the packet data 710, 716 is the padding part attribute information in the packet data 710, 717 is the padding part number information in the packet data 710, 718 is the padding part arrangement position information in the packet data 710, 719 Is an indefinite data area in the packet data 710.

  Note that the packet 705 in the head padding section is composed of a private stream packet in the MPEG format, and the stream ID 712 in the packet header 709 is a value representing the private stream ID. The packet identification information 714 represents an identification ID indicating that the packet data 710 is composed of information related to the padding part in the private stream packet. The required free space information 715 for deleting the padding part represents the free capacity of the recording medium part 203 necessary for deleting the padding part, and is stored in the recording medium part 203 required for deleting the padding part. Is the data size excluding the padding portion in this compressed digital file. Further, the padding part attribute information 716 indicates whether or not the padding part is based on one cluster size. Further, the padding copy number information 717 represents how many padding portions exist in the compressed digital file. The padding portion arrangement position information 718 includes offset information from the leading end of the compressed digital file to the starting point of the padding portion and offset information from the leading end of the compressed digital file to the end point of the padding portion. There are as many paddings as indicated by information 717.

  When the head padding unit generation unit 206 generates the heading padding unit 701, the pack header 703 is generated based on the information by copying the pack header in the compressed digital data unit 702 of the latter half part after division. The system header 704 is generated based on information copied from the system header in the compressed digital file before division.

  Further, when generating the packet 705 in the head padding unit, first, the padding information generation unit 205 generates packet configuration information, and the top based on the packet configuration information generated in the padding information generation unit 205 A packet 705 in the padding part is generated. Note that when the packet configuration information is generated by the padding information generation unit 205, the start code 711 and the stream ID 712 are generated in accordance with the information defined in MPEG, and the packet length 713 matches the size of the packet length to be generated. To set. The packet identification information 714 is set with an ID for identifying that the packet data is composed of information related to the padding part, and the padding part deletion necessary free space information 715 is set with the padding part from the compressed digital file. Set the excluded data size. In the previous division / combination process, if the padding part already exists in the main compressed digital file and the padding part information is recorded in the first padding part of the compressed digital file before division, The size of the padding part in the main compressed digital file is calculated on the basis of the above information, and the free space set in the necessary free space information 715 for padding part deletion is calculated. The padding part attribute information 716 is set with information indicating whether or not the padding part is of one cluster size, and the padding part number information 717 is set with how many padding parts are present in the main compressed digital file. To do. This padding number information 717 is also the case where the padding part already exists in the main compressed digital file and the padding part information is recorded in the leading padding part of the compressed digital file before division in the previous division / combination processing. Calculates the number of padding copies in the compressed digital file based on the information in the head padding portion. Further, the padding portion arrangement position information 718 includes offset information from the leading end of the compressed digital file to the starting point of the padding portion, and the padding portion information from the leading end of the compressed digital file by the number of padding indicated by the padding portion number information 717. Set the offset information to the end point. In the padding portion arrangement position information 718, the padding portion already exists in the main compressed digital file in the previous division / combination processing, and the padding portion information is recorded in the head padding portion of the compressed digital file before division. If it is, the position information of the padding portion is acquired based on the information in the head padding portion, and the padding portion placement position information in the compressed digital file is generated.

Next, the first padding part deletion processing method according to the first embodiment will be described with reference to FIGS.
FIG. 8 is a block diagram of the padding part deletion unit in the first embodiment. In FIG. 8, reference numeral 801 denotes a padding part deletion timing detection unit that detects the deletion timing of the padding part, 802 denotes a padding part deletion control unit that performs management control of padding part deletion, and 803 denotes a recording medium part 203. The padding section information analysis / change section for analyzing the padding section information in the padding section of the compressed digital file and the information changing process, 804 is the data writing section for writing the compressed digital data to the recording medium section 203, and 805 is A data reading unit for reading compressed digital data from the recording medium unit 203, and a file operation unit 806 for creating / deleting / renaming a file.

FIG. 9 is a chart showing the first padding part deletion process in the first embodiment.
When the operation management control unit 201 notifies the padding unit deletion unit 208 of an instruction to combine the compressed digital with the padding unit added in the recording medium unit 203 with another compressed digital file, the padding unit deletion unit 208 The padding unit deletion timing detection unit 801 detects that the file combination processing has started, and notifies the padding unit deletion control unit 802 of this (step 901). In response to the notification, the padding part deletion control unit 802 issues a padding part information analysis instruction for the latter half of the file to be combined to the padding part information analysis changing part 803 (step 902). The information analysis changing unit 803 confirms the presence or absence of a padding unit. If there is a padding unit, the information analysis changing unit 803 acquires and analyzes padding unit information and notifies the padding unit deletion control unit 802 of the result.

  The padding part deletion control unit 802 checks whether there is a padding part in the latter half of the two files to be combined based on the padding part information acquired from the padding part information analysis change part 803 (step 903). ).

  If there is no padding part, the padding part deletion control unit 802 determines not to perform the padding part deletion process (step 910), and performs only a normal file combination process (step 911).

  On the other hand, if there is a padding part, the padding part deletion control part 802 acquires the free space information in the recording medium part 203 (step 904), and the padding in the padding part information obtained from the padding part information analysis change part 803 It is compared with the required free space information 715 for deleting copies (step 905).

  If the free space in the recording medium unit 203 is smaller than the required free space information 715 for padding portion deletion, it is determined not to perform the padding portion deletion processing (step 910), and only the normal file combination processing is performed (step 911). ).

  If the free space in the recording medium unit 203 is larger than the required free space information 715 for padding portion deletion, the padding deletion processing is started simultaneously with the file combination processing (step 906), and acquired from the padding portion information analysis changing portion 803. Based on the padding part number information 717 and padding part arrangement position information 718 in the padding part information, the data reading part 805 is instructed to read only the data excluding the padding part from the data of the latter half of the file to be combined. Is read (step 907). Then, the data writing unit 804 is instructed to write and add the read data to the first half of the file to be combined, the writing is added, and the padding deletion process is performed simultaneously with the file combining process (step 908).

  After performing the file combination process and the padding deletion process as described above, it is checked whether or not a padding portion exists in the file after the file combination process (step 909).

  If there is a padding part, the size of the entire file has changed as a result of combining the files. Therefore, the padding part information analysis changing part 803 is instructed to change the padding part information, and the padding part deletion necessary space in the padding part information is required. The capacity information 715 and the padding portion arrangement position information 718 are modified and changed (step 912). Thereafter, the file operation unit 806 is instructed to delete the latter half of the file before the file combination, and the latter half of the file before the file combination is deleted (step 913), thereby completing the file combination process.

  If no padding portion exists, the file operation unit 806 is instructed to delete the latter half of the file before joining the files, and the latter half of the file before joining the files is deleted (step 913). Complete the process.

  Next, the second padding part deletion processing method according to the first embodiment will be described with reference to FIGS. FIG. 10 is a chart showing the second padding part deletion process in the first embodiment.

  When the operation management control unit 201 notifies the padding unit deletion unit 208 of an instruction to reproduce the compressed digital with the padding unit added in the recording medium unit 203, the padding unit deletion timing in the padding unit deletion unit 208 is notified. The detection unit 801 detects that the file reproduction process has started, and notifies the padding unit deletion control unit 802 of this (step 1001). In response to the notification, the padding part deletion control unit 802 issues a padding part information analysis changing command for the file to be reproduced to the padding part information analysis changing part 803 (step 1002). Then, the presence / absence of a padding part is confirmed. If there is a padding part, the padding part information is acquired and analyzed, and the result is notified to the padding part deletion control part 802.

  The padding part deletion control unit 802 checks whether there is a padding part in the file to be reproduced based on the padding part information acquired from the padding part information analysis change unit 803 (step 1003).

  If there is no padding part, the padding part deletion control unit 802 determines not to perform the padding part deletion process (step 1014), performs only the normal file reproduction process (step 1015), and completes the file reproduction process. .

  On the other hand, if there is a padding part, the padding part deletion control part 802 acquires the free space information in the recording medium part 203 (step 1004), and the padding part information in the padding part information obtained from the padding part information analysis change part 803 It is compared with the necessary free space information 715 for deleting the padding part (step 1005).

  If the free space in the recording medium unit 203 is smaller than the required free space information 715 for padding portion deletion, it is determined not to perform the padding portion deletion processing (step 1014), and only normal file reproduction processing is performed (step 1015). ) And complete the file playback process.

  If the free space in the recording medium unit 203 is larger than the necessary free space information 715 for padding part deletion, the padding deletion process is started simultaneously with the file reproduction process (step 1006) to temporarily record the compressed digital data. The file operation unit 806 is instructed to create a new temporary file, and the temporary file is created (step 1007). Then, based on the padding part number information 717 in the padding part information acquired from the padding part information analysis changing part 803 and the padding part arrangement position information 718, data is read so that only the data excluding the padding part is read from the file data to be reproduced. The reading unit 805 is instructed to read data (step 1008). Then, the read data is used for reproduction, and the data writing unit 804 is instructed to write and add to the newly created temporary file, and writing is added and the compressed digital data having no padding unit is recorded in the temporary file. (Step 1009), and the file reproduction process is terminated. Thereafter, the padding section deletion control section 802 checks whether or not the playback has been performed up to the end of the playback file and the compressed digital data up to the end of the playback file has been recorded in the temporary file (step 1010).

  If playback and recording have been performed up to the end of the file, the file operation unit 806 is instructed to delete the playback file, and the playback file is deleted (step 1011). Thereafter, the file operation unit 806 is instructed to change the temporary file name to the same name as the playback file name, and the file name is changed to delete the compressed digital data file in which the padding unit exists (step 1012). In this way, the file reproduction process and the padding part deletion process are completed.

  If playback and recording up to the end of the file has not been performed, the file operation unit 806 is instructed to delete the temporary file, and the temporary file is deleted (step 1013). The copy deletion process is completed.

  Next, the third padding part deletion processing method in the first embodiment will be described with reference to FIGS. FIG. 11 is a chart showing the third padding part deletion process in the first embodiment.

  The operation management control unit 201 has notified the padding unit deletion unit 208 of an instruction to copy the compressed digital with the padding unit in the recording medium unit 203 added to a recording medium different from the recording medium unit 203. In this case, the padding unit deletion timing detection unit 801 in the padding unit deletion unit 208 detects that the file copy process has started, and notifies the padding unit deletion control unit 802 of this (step 1101). In response to the notification, the padding part deletion control unit 802 issues a padding part information analysis changing command for the file to be copied to the padding part information analysis changing part 803 (step 1102). Then, the presence / absence of a padding part is confirmed. If there is a padding part, the padding part information is acquired and analyzed, and the result is notified to the padding part deletion control part 802.

  The padding part deletion control unit 802 checks whether there is a padding part in the file to be copied based on the padding part information acquired from the padding part information analysis change part 803 (step 1103).

  If there is no padding part, the padding part deletion control unit 802 determines not to perform the padding part deletion process (step 1108), performs only the normal file copy process (step 1109), and completes the file copy process. .

  If there is a padding section, the padding section deletion control section 802 starts the file copy process and the padding deletion process in the compressed digital file at the copy destination simultaneously (step 1104). An instruction is given to create a new file with the same name as the copy source in the copy destination recording medium, and a file with the same name as the copy source is created (step 1105). Then, based on the padding part number information 717 in the padding part information acquired from the padding part information analysis changing part 803 and the padding part arrangement position information 718, data is read so that only the data excluding the padding part is read from the file data to be copied. The reading unit 805 is instructed to read data (step 1106). Then, the data writing unit 804 is instructed to write and add the read data to a file in the copy destination recording medium, the writing is added, and the padding deletion process is performed simultaneously with the file copy process (step 1107). The copy process and the copy destination padding part deletion process are completed.

  Next, a fourth padding part deletion processing method in the first embodiment will be described with reference to FIGS. FIG. 12 is a chart showing the fourth padding part deletion process in the first embodiment.

  When the operation management control unit 201 notifies the padding unit deletion unit 208 of a clean-up instruction for the randomly accessible recording medium unit 203, the padding unit deletion timing detection unit 801 in the padding unit deletion unit 208 records the recording medium unit. It is detected that the cleanup process 203 is started, and this is notified to the padding section deletion control section 802 (step 1201). In response to the notification, the padding section deletion control section 802 issues a padding section information analysis command for files existing in the recording medium section 203 to the padding section information analysis changing section 803 (step 1202). The part information analysis changing unit 803 checks the presence / absence of a padding part, and if there is a padding part, obtains and analyzes the padding part information and notifies the padding part deletion control part 802 of the result.

  The padding part deletion control unit 802 checks whether there is a padding part in the analysis target file based on the padding part information acquired from the padding part information analysis changing unit 803 (step 1203).

  If there is no padding portion, the padding portion deletion control unit 802 checks whether or not the padding portion deletion processing has been completed for all the files in the recording medium portion 203 (step 1213), and processes all the files. Is completed, the cleanup process of the recording medium unit 203 is completed. If there is an unprocessed file, the process from step 1202 is repeated.

  On the other hand, if there is a padding part, the padding part deletion control part 802 acquires the free space information in the recording medium part 203 (step 1204), and the padding in the padding part information obtained from the padding part information analysis change part 803 It is compared with the required free space information 715 for deleting copies (step 1205).

  When the free space in the recording medium unit 203 is smaller than the required free space information 715 for padding part deletion, the padding part deletion process is not performed for the analysis target file, and the process for the analysis target file is terminated. Thereafter, it is checked whether or not the process of deleting the padding part has been completed for all the files in the recording medium part 203 (step 1213). If the process has been completed for all the files, the cleanup process of the recording medium part 203 is performed. If there is an unprocessed file, the processing from step 1202 is repeated.

  If the free space in the recording medium unit 203 is larger than the required free space information 715 for padding unit deletion, a padding deletion process is started (step 1206), and a file operation unit is used to temporarily record compressed digital data. An instruction to create a temporary file is made to 806, and a temporary file is created (step 1207). Then, based on the padding part number information 717 in the padding part information acquired from the padding part information analysis changing part 803 and the padding part arrangement position information 718, only the data excluding the padding part from the data of the padding part deletion target file is read. The data reading unit 805 is instructed to read data (step 1208). Then, the data writing unit 804 is instructed to write and add the read data to the newly created temporary file, and writing is added and the compressed digital data having no padding portion is recorded in the temporary file (step 1209). . After that, it is checked whether the compressed digital data up to the end of the padding part deletion target file has been recorded in the temporary file (step 1210).

  If recording has been performed up to the end of the file, the file operation unit 806 is instructed to delete the padding portion deletion target file, the padding portion deletion target file is deleted (step 1211), and the file operation unit 806 is instructed. On the other hand, by instructing the temporary file name to be changed to the same name as the padding part deletion target file name and changing the file name to delete the compressed digital data file in which the padding part exists (step 1212), Deletion is performed, and the padding part deletion processing for the padding part deletion target file is terminated. Thereafter, it is checked whether or not the process of deleting the padding part has been completed for all the files in the recording medium part 203 (step 1213). If the process has been completed for all the files, the cleanup process of the recording medium part 203 is performed. If there is an unprocessed file, the processing from step 1202 is repeated.

  If no recording has been performed up to the end of the file, the file operation unit 806 is instructed to delete the temporary file, and the temporary file is deleted (step 1214). The process ends. Thereafter, it is checked whether or not the process of deleting the padding portion has been completed for all the files in the recording medium (step 1213). When the processes have been completed for all the files, the cleanup process in the recording medium is completed. If there is an unprocessed file, the processing from step 1202 is repeated.

As described above, the padding portion deletion processing for all files is completed, and the cleanup processing in the recording medium and the padding portion deletion processing are completed.
Further, a padding part information comparison unit for comparing the acquired padding part information is provided in the padding part deletion unit 208, and when there are a plurality of compressed digital files in which the padding part exists, in the padding part information comparison unit, Compare the information of the required free space information 715 for padding part deletion in the padding part information acquired for each compressed digital file in which the padding part exists, and delete the padding part from the smallest required free space information 715 for padding part deletion. By doing so, it is possible to increase the cleanup efficiency in the recording medium by increasing the establishment of deletion of the padding portion and efficiently increasing the free space.

  According to such a file dividing / combining apparatus according to the first embodiment, invalid data (padding portion) arranged when dividing an MPEG system stream file is converted into a private stream in one or more MPEG formats. It is composed of packets, information related to the padding part arranged at the time of division is arranged in the private stream packet, and the padding part is deleted at a predetermined timing based on the information related to the padding part in the private stream packet Therefore, the padding part can be deleted efficiently, and the capacity in the recording medium can be used effectively.

(Embodiment 2)
The second embodiment of the present invention will be described below.
First, the concept of the process of combining digital video and audio data files compressed in the MPEG format will be described with reference to FIGS.

  FIG. 13 is a file structure diagram associated with the combination of digital video / audio data files compressed in the MPEG format according to the second embodiment. In FIG. 13, the first half of the file before joining is referred to as file 4, the latter half of the file before joining is designated as file 5, and the file after joining is designated as file 6. Reference numeral 1302 denotes the leading end of the file 4, 1305 denotes the end of the file 4, 1303 and 1306 denote cluster boundaries of the file 4, and 1304 denotes a boundary of the last GOP of the file 4. Reference numeral 1308 denotes the front end of the file 5, and 1309 denotes the end of the file 5. Reference numeral 1311 denotes the leading end of the file 6, 1316 denotes the end of the file 6, and 1312, 1313, and 1315 denote cluster boundaries of the file 6.

  FIG. 14 is a block diagram of the file dividing / combining apparatus according to the second embodiment. In FIG. 14, 1401 is an operation management control unit that manages control commands such as file division and join and issues control commands to the relation control unit, 1402 is a GOP boundary information acquisition unit that acquires information about GOP boundary positions, 1403 Is a randomly accessible recording medium unit that stores a compressed digital file, etc. 1404 is a cluster boundary information acquisition unit that acquires information about the cluster boundary position, and 1405 is padding information that generates information about a padding unit of the compressed digital file. The generation unit 1406 generates an empty part from the end GOP boundary of the first half compressed digital file to be combined to the second half compressed digital file to be combined as an intermediate padding unit, and 1407 combines 1 cluster at the top of the compressed digital file in the first half A leading padding unit for generating a leading padding part of the noise, 1408 is a combined file generating unit for generating a file and moving and copying data at the time of combining files, and 1409 is recorded in the leading padding part of the file It is a padding part deleting unit that deletes the padding part of the compressed digital file based on the information that is stored.

FIG. 15 is a chart showing processing from the start of file combination to the completion of file combination in the second embodiment.
When the operation management control unit 1401 notifies the file combination instruction of the file 4 and the file 5, the connection at the cluster boundary which is the minimum unit of recording on the recording medium is required. Therefore, first, the GOP boundary information acquisition unit 1402 searches for the last GOP end 1304 of the first half of the file instructed to be joined (step 1501), and then acquires the GOP end 1304 information for the cluster boundary information. The cluster boundary information acquisition unit 1404 searches the cluster boundary 1306 at the end of the cluster including the GOP end 1304 (step 1502). Then, it is checked whether the end point 1304 of the searched GOP matches the cluster boundary 1306 (step 1503).

  If the end point 1304 of the searched GOP matches the cluster boundary 1306, the combined file generation unit 1408 connects the end 1304 to the end 1309 of the file 5 to the end 1304 of the GOP (step 1509), and the file 4 is connected to the combined file 6 To complete the file combination process (step 1508).

  On the other hand, if the end point 1304 of the searched GOP and the cluster boundary 1306 do not match, first, the padding information generation unit 1405 obtains the size from the end point 1304 of the GOP to the cluster boundary 1306 (step 1504). The intermediate padding unit generation unit 1406 constructs the intermediate padding unit at the end 1304 of the GOP of the file 4 with the size obtained by the padding information generation unit 1405 (step 1505). Further, the combined file generation unit 1408 connects the end 1308 to the end 1309 of the file 5 to the end of the intermediate padding unit (step 1506). Thereafter, the head padding part generation unit 1407 builds the head padding part at the head of the file 4 based on the information generated by the padding information generation part 1405 (step 1507), and completes the file combination with the file 4 as the file 6. (Step 1508).

  Next, the structure of the padding unit generated by the head padding unit generation unit 1407 and the intermediate padding unit generation unit 1406 will be described with reference to FIG. 16, and the padding information generation unit 1405, the head padding unit generation unit 1407, and the intermediate padding will be described. A process in which the part generation unit 1406 constructs a padding part will be described.

  FIG. 16 is a structural diagram of a padding unit generated by the head padding unit generation unit 1407 and the intermediate padding unit generation unit 1406 in the second embodiment. In FIG. 16, 1601 is a head padding part, 1602 is a compressed digital data part of the first half after combination, 1603 is a pack header in the padding part, 1604 is a system header in the head padding part, 1605 is a packet in the padding part, and 1606 is a combination. The leading end of the later compressed digital file, 1607 is the head of the first half of the GOP after combining, 1608 is the end of the last GOP of the first half after combining, 1609 is the packet header of the packet 1605 in the padding section, and 1610 is in the padding section Packet data of the packet 1605, 1611 a start code in the packet header 1609, 1612 a stream ID in the packet header 1609, 1613 a packet length in the packet header 1609, and 1614 a packet data 1616 is the packet identification information in the packet data 1610, 1616 is the padding part attribute information in the packet data 1610, 1617 is the padding number information in the packet data 1610, and 1618 is the padding in the packet data 1610. The part arrangement position information 1619 is an indefinite data area in the packet data 1610.

  Reference numeral 1620 denotes an intermediate padding part, 1621 denotes a compressed digital data part in the latter half part after the combination, 1622 denotes a head of the GOP in the latter half part after the combination, and 1623 denotes an end of the compressed digital file after the combination.

  The packet 1605 in the head padding section 1601 and the intermediate padding section 1620 is composed of a private stream packet in the MPEG format, and the stream ID 1612 in the packet header 1609 is a value representing the private stream ID. The packet identification information 1614 represents an identification ID indicating that the packet data is composed of information related to the padding part in the private stream packet. The necessary free space information 1615 for deleting the padding part represents the free space in the recording medium part 1403 required when deleting the padding part, and the recording medium part 1403 required when deleting the padding part. The free space inside is the data size excluding the padding part in the compressed digital file. Further, the padding part attribute information 1616 represents whether or not the padding part is based on one cluster size. Also, the padding number information 1617 represents how many padding portions exist in the compressed digital file. The padding portion arrangement position information 1618 includes offset information from the leading end of the compressed digital file to the starting point of the padding portion and offset information from the leading end of the compressed digital file to the end point of the padding portion. There are as many paddings as indicated by information 1617.

  When the head padding unit generation unit 1407 generates the heading padding unit 1601, the pack header 1603 is generated based on the information by copying the pack header in the compressed digital data unit 1602 of the first half after combining, The system header 1604 is generated based on information copied from the system header in the compressed digital file before combining. Further, when the intermediate padding unit generation unit 1406 generates the intermediate padding unit 1620, the pack header 1603 is generated based on the information by copying the pack header in the compressed digital data unit 1621 of the latter half part after the combination. To do.

  Further, when generating the packet 1605 in the head padding section, first, the pad information generating section 1405 generates packet configuration information, and the head based on the packet configuration information generated in the padding information generating section 1405 is generated. A packet 1605 in the padding part is generated. When the packet configuration information is generated by the padding information generation unit 1405, the start code 1611 and the stream ID 1612 are generated according to the information stipulated by MPEG, and the packet length 1613 matches the size of the packet length to be generated. To set. The packet identification information 1614 is set with an ID that can identify that the packet data is composed of information related to the padding part, and the padding part deletion necessary free space information 1615 contains the padding part from the compressed digital file. Set the excluded data size. In the previous division / combination process, if the padding part already exists in this compressed digital file and the padding part information is recorded in the leading padding part of the compressed digital file before joining, Based on this information, the size of the padding portion in the main compressed digital file is calculated, and the free space set in the necessary free space information 1615 for padding portion deletion is calculated. The padding part attribute information 1616 is set with information indicating whether or not the padding part is of one cluster size, and the padding part number information 1617 is set with how many padding parts are present in the main compressed digital file. To do. This padding number information 1617 is also the case where the padding part already exists in the main compressed digital file in the previous division / combination processing, and the padding part information is recorded in the head padding part of the compressed digital file before combining. Calculates the number of padding copies in this compressed digital file based on the information in the head padding portion. Further, the padding portion arrangement position information 1618 includes the offset information from the leading end of the compressed digital file to the starting point of the padding portion, and the padding portion of the padding portion from the leading end of the compressed digital file by the number of padding indicated by the padding portion number information 1617 Set the offset information to the end point. In the padding portion arrangement position information 1618, the padding portion already exists in the main compressed digital file in the previous division / combination processing, and the padding portion information is recorded in the first padding portion of the compressed digital file before joining. If it is, the position information of the padding portion is acquired based on the information in the head padding portion, and the padding portion placement position information in the compressed digital file is generated.

  When building the padding part generated by the head padding part generation part 1407, if the file head padding part already exists at the head of the first half part of the file to be combined, the file heading padding part is not newly added, and the existing padding part is not added. More preferably, the information of the padding part added at the time of combining is additionally recorded in the file top padding part. This is because the information of the padding part can be saved while suppressing the size of the padding part to be added, and the recording medium can be used more efficiently.

  Further, when the padding part generated by the head padding part generation part 1407 is constructed, if the file heading padding part is present at the head of the second half part of the compressed digital file to be combined with one cluster size, the compressed digital file is combined at the time of combining. More preferably, the padding part information is constructed by reflecting the information obtained by deleting the latter half file top padding part of the compressed file and the latter part file heading padding part of the compressed digital file. This is also because the size of the padding portion to be added can be suppressed and the information of the padding portion can be saved, and the recording medium can be used more efficiently.

  Further, the padding part deletion processing method and apparatus in the second embodiment are also the same as those described with reference to FIGS. 8 to 12 in the first embodiment of the present invention. Omitted.

  According to such a file division and combination apparatus according to the second embodiment, invalid data (padding portion) arranged when combining MPEG system stream files is converted into a private stream in one or a plurality of MPEG formats. It is composed of packets, information related to the padding part arranged at the time of combining is arranged in the private stream packet, and the padding part is deleted based on the information related to the padding part in the private stream packet at a predetermined timing Therefore, the padding part can be deleted efficiently, and the capacity in the recording medium can be used effectively.

(Embodiment 3)
The third embodiment of the present invention will be described below.
FIG. 17 is a block diagram of the file division / combination apparatus according to the third embodiment. In FIG. 17, reference numeral 1701 denotes an information file creation unit that creates / records information related to the padding unit as an information file. Note that the difference from the configuration of the file division and coupling apparatus in the first embodiment shown in FIG. 2 is that an information file creation unit 1701 is provided, and the components other than the information file creation unit 1701 in FIG. Since they are the same as the components shown in FIG. 2 in the first embodiment, description thereof is omitted.

  Further, regarding the processing from the start of file division to the completion of file division and the structure of the padding unit generated by the head padding unit generation unit 206 in the third embodiment, FIG. 1 to FIG. 3 in the first embodiment are used. The process from the start of file division to the completion of file division, the structure of the padding unit generated by the head padding unit generation unit 206, the construction of the padding unit packet to be constructed by padding packets in MPEG format, and generation of padding information Since the padding part information generated by the part 205 is the same except that it is recorded in the information file instead of in the padding part, description thereof is omitted.

Next, the structure of the information file generated by the information file creation unit 1701 will be described with reference to FIG.
FIG. 18 is a structure diagram of an information file generated by the information file creation unit 1701 according to the third embodiment. In FIG. 18, 1801 is an information file, 1802 is a common information area in the information file, and 1803 and 1804 are individual file detailed information areas.

  Further, only one common information area 1802 is arranged in the information file 1801, and in the common information area 1802, the compressed digital file number information 1805 including the padding part in the recording medium unit 203 and the compressed digital file number information are included. The file individual summary information 1806 is arranged for the number represented by 1805. In the individual file summary information 1806, file path information and file name information, which are information for identifying the location of the compressed digital file including the padding part, and link information to the individual file detailed information area are arranged.

  Further, the file individual detailed information area is arranged in the information file 1801 by the number represented by the compressed digital file number information 1805, and the file individual detailed information area includes the necessary free space information for deleting the padding portion of the target file, Padding part position information is arranged for the number of padding copies of the target file and the number of pieces represented by the padding copy number information.

  Further, the required free space information for deleting the padding part represents the free space in the recording medium part 203 required when deleting the padding part. Note that the free space in the recording medium unit 203 necessary for deleting the padding part is the data size excluding the padding part in the target compressed digital file. The padding number information represents how many padding parts exist in the target compressed digital file. The padding portion arrangement position information includes offset information from the leading end of the target compressed digital file to the start point of the padding portion, and offset information from the leading end of the target compressed digital file to the end point of the padding portion.

  When the information file creation unit 1701 creates the information file 1801 and the information file 1801 already exists, the information file creation unit 1701 additionally records information in the existing information file without creating it.

  When a compressed digital file including a padding part is newly generated at the time of file division or file combination, the information file creation part 1701 first increments the compressed digital file number information 1805 in the common information area 1802 by one. One piece of individual summary information 1806 and one piece of file individual detailed information are additionally arranged. In addition, when the information related to the padding part of the compressed digital file including the existing padding part is changed at the time of file division or combination, the information file creation part 1701 stores the information in the common information area 1802 corresponding to the target compressed digital file. The file individual outline information 1806 and the file individual detailed information are searched, and the internal information is updated.

  Note that when creating or updating information in the individual file detailed information area when dividing or combining files, the data size excluding the padding portion from the target compressed digital file is set in the necessary free space information for deleting the padding portion. . In the previous division / combination process, when the padding part already exists in the target compressed digital file and the padding part information is recorded in the information file 1801, based on the information in the information file 1801, The size of the padding portion in the target compressed digital file is calculated, and the free space set in the necessary free space information for deleting the padding portion is calculated.

  Also, the number of padding parts information sets how many padding parts exist in the target compressed digital file. This padding number information is also stored in the information file 1801 when the padding part already exists in the target compressed digital file and the padding part information is recorded in the information file 1801 in the previous division / combination process. Based on the information, the number of padding copies in the target compressed digital file is calculated.

  The padding part arrangement position information includes the number of paddings indicated by the padding part number information, offset information from the leading end of the target compressed digital file to the starting point of the padding part, and the end point of the padding part from the leading end of the target compressed digital file. Set offset information to This padding portion arrangement position information is also included in the information file 1801 when the padding portion already exists in the target compressed digital file and the padding portion information is recorded in the information file 1801 in the previous division / combination processing. Based on this information, position information where the padding part is arranged is acquired, and padding part arrangement position information in the target compressed digital file is generated.

  FIG. 19 is a block diagram of the padding part deletion unit in the third embodiment. In FIG. 19, reference numeral 1901 denotes an information file information analysis changing unit for analyzing / changing an information file related to the padding unit. 8 differs from the configuration of the padding part deletion unit 208 in the first embodiment shown in FIG. 8 in that an information file information analysis change unit 1901 is provided instead of the padding part information analysis change unit 803 in FIG. The components other than the information file information analysis change unit 1901 in FIG. 19 are the same as the components shown in FIG.

  Further, the padding part deletion processing method and apparatus in the third embodiment are also the same as those in the first embodiment described with reference to FIGS. 8 to 12, and the difference is the padding part in the padding part. The content of analyzing / changing the information is replaced with the content of analyzing / changing the padding part information in the information file. The rest is the same as in the first embodiment, and the detailed description thereof is omitted. To do.

  According to such a file division and coupling apparatus according to the third embodiment, information relating to invalid data (padding part) arranged when dividing an MPEG system stream file is recorded in an information file, and a predetermined timing is set. Since the padding part is deleted based on the information about the padding part in the information file, the padding part can be efficiently deleted without analyzing the MPEG system stream file. It is possible to make effective use of the capacity.

(Embodiment 4)
Embodiment 4 of the present invention will be described below.
FIG. 20 is a block diagram of the file dividing / combining apparatus according to the fourth embodiment. In FIG. 20, reference numeral 2001 denotes an information file creation unit that creates / records information about a padding unit as an information file. The difference from the configuration of the file dividing apparatus in the second embodiment shown in FIG. 14 is that an information file creation unit 2001 is provided except for the head padding generation unit 1407, and the information file creation unit 2001 in FIG. Since the other constituent elements are the same as those shown in FIG. 14 in the second embodiment, description thereof is omitted.

  In addition, regarding the processing from the start of file combination to the completion of file combination in the fourth embodiment and the structure of the padding unit generated by the intermediate padding unit generation unit 1406, FIG. 13 to FIG. 15 in the second embodiment are used. The process from the start of file combination to the completion of file combination, the structure of the padding unit generated by the intermediate padding unit generation unit 1406, the construction of the padding unit packet to be constructed by the padding packet in MPEG format, and the top padding Since it is the same except that the padding part information generated by the padding information generation part 1405 is not recorded in the padding part but in the information file without being constructed, description thereof is omitted.

  Also, the structure of the information file generated by the information file creation unit 2001 is the same as the structure of the information file described with reference to FIG. 18 in the third embodiment, and a description thereof will be omitted.

  The configuration of the padding part deletion unit in the fourth embodiment is the same as the configuration of the padding part deletion unit described in the third embodiment with reference to FIG.

  The padding part deletion processing method and apparatus according to the fourth embodiment are also described with reference to FIGS. 8 to 12 in the first embodiment, but the padding part information in the padding part is analyzed / changed. This is the same as the content that is replaced with the content of analyzing / changing the padding part information in the information file, and the description is omitted.

  According to the file division and concatenation apparatus according to the fourth embodiment, information related to invalid data (padding part) arranged at the time of combining MPEG system stream files is recorded in an information file, and a predetermined timing is set. Since the padding part is deleted based on the information about the padding part in the information file, the padding part can be efficiently deleted without analyzing the MPEG system stream file. It is possible to make effective use of the capacity.

  The file dividing / combining method and apparatus according to the present invention arranges information on invalid data (padding part) arranged when dividing or combining MPEG system stream files in the padding part, and performs padding at a predetermined timing. The present invention is useful for a file division coupling method and apparatus that has a function of efficiently deleting a padding part based on information related to the padding part recorded in the part and that effectively uses the capacity of the recording medium.

  In addition, the file dividing / combining method and apparatus according to the present invention arranges information on invalid data (padding part) arranged when dividing or combining MPEG system stream files in an information file, and A file that has the function of efficiently deleting the padding part without analyzing the MPEG system stream file based on the information about the padding part in the information file at the timing, and effectively utilizing the capacity in the recording medium It is useful for split-joint methods and devices.

File structure diagram accompanying division in Embodiment 1 of the present invention Block diagram of file division and combination method and apparatus according to Embodiment 1 of the present invention The chart figure showing the processing from the file division start to the file division completion in Embodiment 1 of the present invention Figure showing the MPEG format ES (Elementary Stream) structure Diagram showing MPEG format PES (Packetized Elementary Stream) structure Figure showing the MPEG format PS (Program Stream) structure Structure diagram of padding section in embodiment 1 of the present invention The block diagram of the padding part deletion part in Embodiment 1 of this invention The chart figure showing the deletion processing of the 1st padding part in Embodiment 1 of the present invention The chart figure showing the deletion processing of the 2nd padding part in Embodiment 1 of the present invention The chart figure showing the deletion process of the 3rd padding part in Embodiment 1 of this invention The chart figure showing the deletion processing of the 4th padding part in Embodiment 1 of the present invention File structure diagram accompanying combination in Embodiment 2 of the present invention Block diagram of file division and combination method and apparatus according to Embodiment 2 of the present invention The chart figure showing processing from the start of file combination to the completion of file combination in Embodiment 2 of the present invention Structure diagram of padding section in embodiment 2 of the present invention Block diagram of file division and combination method and apparatus according to Embodiment 3 of the present invention Structure diagram of information file in Embodiment 3 of the present invention Block diagram of padding part deletion unit in Embodiment 3 of the present invention Block diagram of file division and combination method and apparatus according to Embodiment 4 of the present invention The figure which shows the conventional file division | segmentation method and apparatus

Explanation of symbols

201, 1401 Operation management control unit 202, 1402 GOP boundary information acquisition unit 203, 1403 Recording medium unit 204, 1404 Cluster boundary information acquisition unit 205, 1405 Padding information generation unit 206, 1407 Leading padding unit generation unit 1406
Intermediate padding unit generation unit 207 Division file generation unit 1408 Combined file generation unit 208, 1409 Padding unit deletion unit 1701, 2001 Information file generation unit 801 Padding unit deletion timing detection unit 802 Padding unit deletion control unit 803 Padding unit information analysis change unit 804 Data writing unit 805 Data reading unit 806 File operation unit 1901 Information file information analysis change unit

Claims (46)

Digital video / audio data compressed in MPEG format recorded on a randomly accessible recording medium is used as a compressed digital file, and the compressed digital file is divided or combined at a cluster boundary which is the minimum unit of recording on the recording medium. In the file split and join method to
Boundary information is acquired in GOP (Group Of Picture) unit which is the minimum unit for reproducing the compressed digital file,
When dividing the compressed digital file, in the latter half of the compressed digital file after the division, an empty portion from the beginning of the latter half of the compressed digital file to the beginning GOP boundary is used as a file head padding portion,
Record information about the padding part of the compressed digital file in the file head padding part,
Deleting the padding portion of the compressed digital file based on information recorded in the file head padding portion at a predetermined timing;
A file dividing and combining method characterized by the above. Digital video / audio data compressed in MPEG format recorded on a randomly accessible recording medium is used as a compressed digital file, and the compressed digital file is divided or combined at a cluster boundary which is the minimum unit of recording on the recording medium. In the file split and join method to
Boundary information is acquired in GOP (Group Of Picture) unit which is the minimum unit for reproducing the compressed digital file,
When the compressed digital files are combined, in the first half of the compressed digital files to be combined, an empty part from the end GOP boundary of the first compressed digital file to be combined to the second compressed digital file to be combined is subjected to file intermediate padding. And
Add a file head padding part composed of one cluster size to the head of the compressed digital file to be combined,
Record information about the padding part of the compressed digital file in the file head padding part,
Deleting the padding portion of the compressed digital file based on information recorded in the file head padding portion at a predetermined timing;
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1 or Claim 2,
The padding unit is composed of one or a plurality of private stream packets in MPEG format,
The information recorded in the head padding part includes ID information for identifying the padding part, free space information of a recording medium necessary for deleting the padding part, the total number of padding parts, and the padding part start from the head of the file. It consists of offset information to the point, offset information from the beginning of the file to the padding part end point, and information on whether or not it is a one cluster size padding part.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 3,
The free capacity of the recording medium necessary for deleting the padding part is equal to the data size value excluding the padding part in the compressed digital file,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of any one of Claim 1 thru | or 3,
Deleting the padding part of the compressed digital file
In the information about the padding part recorded in the head padding part, it is performed only when the free space of the recording medium necessary for deleting the padding part is smaller than the free space of the current recording medium,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1 or Claim 2,
The predetermined timing is a timing at which the compressed digital file to which the padding unit is added is combined with another compressed digital file.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1, Claim 2, or Claim 6,
Deleting the padding part of the compressed digital file
When combining the compressed digital file with the padding part added with another compressed digital file, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, By writing to the file and appending,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1 or Claim 2,
The predetermined timing is a timing for reproducing the compressed digital file to which the padding unit is added.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1, Claim 2, or Claim 8,
Deleting the padding part of the compressed digital file
When playing back the compressed digital file with the padding part added, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, and a new temporary compressed digital file is created. Then, the read data is written and added to the created temporary compressed digital file, and playback is performed up to the end of the compressed digital file with the padding portion added, and the end of the compressed digital file with the padding portion added. After the data is written and added, the compressed digital file with the padding part added is deleted, and the file name of the temporary compressed digital file is changed to the same file name as the compressed digital file with the padding part added. Do,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1 or Claim 2,
The predetermined timing is a timing at which the compressed digital file to which the padding unit is added is copied to a recording medium different from the recording medium.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1, Claim 2, or Claim 10,
Deleting the padding part of the compressed digital file
When copying the compressed digital file with the padding portion added to a recording medium different from the recording medium, only the data excluding the padding portion from the compressed digital file with the padding portion added is recorded from the recording medium. Reading, creating a file with the same name as the compressed digital file with the padding unit added in the other recording medium, and writing the read data to the created compressed digital file with the same name
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1 or Claim 2,
The predetermined timing is a timing at which cleanup of the randomly accessible recording medium is instructed.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 1, Claim 2, or Claim 12,
Deleting the padding part of the compressed digital file
When an instruction is given to clean up the randomly accessible recording medium, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, and a new temporary compressed digital file is created. Then, the read data is written and added to the created temporary compressed digital file, and the data is written and added to the end of the compressed digital file to which the padding unit is added, and then the compressed digital file to which the padding unit is added Is performed by changing the file name of the temporary compressed digital file to the same file name as the compressed digital file to which the padding unit is added,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 13,
The deletion of the padding portion of the compressed digital file is performed when the plurality of compressed digital files to which the padding portion is added exist in the recording medium, in the information regarding the padding portion in the head padding portion in each compressed digital file. Compare the free space of the recording medium required to delete the padding part, and delete from the one with the small free space,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 2,
If a file head padding part already exists at the head of the first half of the compressed digital file to be joined, a padding part added at the time of joining to the existing file head padding part without newly adding a file head padding part Record additional information,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 15,
When a file head padding portion already exists at the head of the latter half of the compressed digital file to be combined, the information of the padding portion to be additionally recorded is not only the information of the padding portion added at the time of combining but also the compression to be combined. Also record the information of the padding part in the first padding part of the second half of the digital file.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 15,
When the first file head padding part of the latter half of the compressed digital file to be combined is a 1 cluster size padding part, the information of the padding part to be additionally recorded is not only the information of the padding part added at the time of combining, Information of the padding part in the file head padding part of the latter half part of the compressed digital file to be combined is additionally recorded, and the latter part file head padding part of the compressed digital file to be joined is deleted.
A file dividing and combining method characterized by the above. Digital video / audio data compressed in MPEG format recorded on a randomly accessible recording medium is used as a compressed digital file, and the compressed digital file is divided or combined at a cluster boundary which is the minimum unit of recording on the recording medium. In the file split and join method to
Obtain boundary information in units of MPEG GOP (Group Of Picture), which is the minimum unit for playback of the compressed digital file,
When dividing the compressed digital file, in the latter half of the compressed digital file after the division, an empty portion from the beginning of the latter half of the compressed digital file to the beginning GOP boundary is used as a padding portion,
Create an information file in the recording medium, record information about the padding part in the created information file,
Deleting a padding portion of the compressed digital file based on information recorded in the information file at a predetermined timing;
A file dividing and combining method characterized by the above. Digital video / audio data compressed in MPEG format recorded on a randomly accessible recording medium is used as a compressed digital file, and the compressed digital file is divided or combined at a cluster boundary which is the minimum unit of recording on the recording medium. In the file split and join method to
Boundary information is acquired in GOP (Group Of Picture) unit which is the minimum unit for reproducing the compressed digital file,
When combining the compressed digital files, in the first half of the compressed digital files to be combined, an empty part from the end GOP boundary of the first compressed digital file to be combined to the second compressed digital file to be combined is used as a padding section. ,
Create an information file in the recording medium, record information about the padding part in the created information file,
Deleting a padding portion of the compressed digital file based on information recorded in the information file at a predetermined timing;
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18 or Claim 19,
If the information file already exists in the recording medium, without newly creating the information file, additional information about the padding part is recorded in the existing information file.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18 or Claim 19,
The padding unit is composed of one or more padding packets in MPEG format,
The information related to the padding part recorded in the information file includes the total number information of the file in which the padding part exists, the information for identifying the file in which the padding part exists, and the information for identifying the file in order to delete the padding part. It consists of the required free space information of the recording medium, the total number of padding parts, offset information from the file head to the padding part start point, and offset information from the file head to the padding part end point,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 21,
The free capacity of the recording medium necessary for deleting the padding part is equal to the data size value excluding the padding part in the compressed digital file,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18, Claim 19, or Claim 21,
Deletion of the padding portion of the compressed digital file means that, in the information related to the padding portion in the information file, the free space of the recording medium necessary for deleting the padding portion is smaller than the free space of the current recording medium Only if,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18 or Claim 19,
The predetermined timing is a timing at which the compressed digital file to which the padding unit is added is combined with another compressed digital file.
A file dividing and combining method characterized by the above. 25. The file division and coupling method according to claim 18, 19 or 24,
Deleting the padding part of the compressed digital file
When combining the compressed digital file with the padding part added with another compressed digital file, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, By writing to the file and appending,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18 or Claim 19,
The predetermined timing is a timing for reproducing the compressed digital file to which the padding unit is added.
A file dividing and combining method characterized by the above. 27. The file dividing and combining method according to claim 18, claim 19, or claim 26,
Deleting the padding part of the compressed digital file
When playing back the compressed digital file with the padding part added, only the data excluding the padding part from the compressed digital file with the padding part is read from the recording medium, and a new temporary compressed digital file is created. The read data is written and added to the created temporary compressed digital file, and playback is performed up to the end of the compressed digital file with the padding portion added, and the end of the compressed digital file with the padding portion added. After the data is written and added, the compressed digital file with the padding part added is deleted, and the file name of the temporary compressed digital file is changed to the same file name as the compressed digital file with the padding part added. Do,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18 or Claim 19,
The predetermined timing is a timing at which the compressed digital file to which the padding unit is added is copied to a recording medium different from the recording medium.
A file dividing and combining method characterized by the above. 29. The file division and coupling method according to claim 18, 19 or 28,
The padding part of the compressed digital file is deleted when the compressed digital file to which the padding part is added is copied from the compressed digital file to which the padding part is added when the compressed digital file is copied to a recording medium different from the recording medium. Only the data excluding the part is read from the recording medium, a file with the same name as the compressed digital file with the padding part added is created in the other recording medium, and the read to the created compressed digital file with the same name is made. By writing and adding data,
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18 or Claim 19,
The predetermined timing is a timing at which cleanup of the randomly accessible recording medium is instructed.
A file dividing and combining method characterized by the above. In the file division | segmentation combining method of Claim 18, Claim 19, or Claim 30,
In the deletion of the padding part of the compressed digital file, only the data obtained by removing the padding part from the compressed digital file to which the padding part is added when the cleanup of the randomly accessible recording medium is instructed. After a new temporary compressed digital file is created, the read data is written and added to the created temporary compressed digital file, and the data is written and added to the end of the compressed digital file to which the padding unit is added , By deleting the compressed digital file with the padding portion added, and changing the file name of the temporary compressed digital file to the same file name as the compressed digital file with the padding portion added,
A file dividing and combining method characterized by the above. 32. The file division / combination method according to claim 31.
The deletion of the padding portion of the compressed digital file is performed when each of the compressed digital files is included in the information regarding the padding portion in the information file when there are a plurality of compressed digital files to which the padding portion is added in the recording medium. Compare the free space of the recording medium required to delete the padding part, and delete from the one with the small free space,
A file dividing and combining method characterized by the above. In a file dividing / combining apparatus for converting digital video / audio data compressed in MPEG format into a compressed digital file and dividing or combining the compressed digital files,
A randomly accessible recording medium for storing the compressed digital file;
Cluster boundary information acquisition means for acquiring cluster boundary information which is the minimum unit of recording of the recording medium;
GOP boundary information acquisition means for acquiring boundary information in units of GOP (Group Of Picture) which is the minimum unit for reproducing the compressed digital file;
Split file generation means for generating split files based on the cluster boundary information acquired by the cluster boundary information acquisition means and the GOP boundary information acquired by the GOP boundary information acquisition means;
A head padding part generating means for generating a free part from the head of the compressed digital file of the latter half part after splitting to the head GOP boundary as a file head padding part;
Padding information generating means for generating information related to the padding portion of the compressed digital file in the file head padding portion;
A padding part deleting means for deleting the padding part of the compressed digital file based on information recorded in the file head padding part;
A file division and coupling apparatus characterized by the above. In a file dividing / combining apparatus for converting digital video / audio data compressed in MPEG format into a compressed digital file and dividing or combining the compressed digital files,
A randomly accessible recording medium for storing the compressed digital file;
Cluster combining means for combining the compressed digital files at a cluster boundary which is a minimum unit of recording of the recording medium;
GOP boundary information acquisition means for acquiring boundary information in units of GOP (Group Of Picture) which is the minimum unit for reproducing the compressed digital file;
Intermediate padding unit generating means for generating, as a file intermediate padding unit, an empty part from the end GOP boundary of the combined first half compressed digital file to the combined second half compressed digital file;
A head padding section generating means for generating and adding a file head padding section composed of one cluster size at the head of the compressed digital file to be combined;
Padding information generating means for generating information related to the padding portion of the compressed digital file in the file head padding portion;
A padding part deleting means for deleting the padding part of the compressed digital file based on information recorded in the file head padding part.
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 33 or claim 34,
The padding part deleting means is
When detecting the timing of combining the compressed digital file with the padding portion added with another compressed digital file, the compressed digital file with the padding portion is added based on the information recorded in the head padding portion of the file. Read only the data excluding the padding part from the recording medium,
Write the data read from the recording medium to the other compressed digital file that is the combination destination,
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 33 or claim 34,
The padding part deleting means is
When detecting the timing of reproducing the compressed digital file with the padding part added, only the data excluding the padding part from the compressed digital file with the padding part based on the information about the file head padding part is used. Read from the recording medium,
Create a new temporary compressed digital file, add the data read from the recording medium to the created temporary compressed digital file,
Playback is performed up to the end of the compressed digital file to which the padding portion is added, and after the data is written and added to the end of the compressed digital file to which the padding portion is added, the compressed digital file to which the padding portion is added Delete
Changing the file name of the temporary compressed digital file to the same file name as the compressed digital file to which the padding portion is added;
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 33 or claim 34,
The padding part deleting means is
When the timing of copying the compressed digital file with the padding portion added to a recording medium different from the recording medium is detected, the padding portion is added based on the information recorded in the file head padding portion. Only the data excluding the padding part from the compressed digital file is read from the recording medium,
Creating a file with the same name as the compressed digital file to which the padding unit is added in the other recording medium, and writing and adding data read from the recording medium to the created compressed digital file;
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 33 or claim 34,
The padding part deleting means is
When the timing at which the cleanup of the randomly accessible recording medium is instructed is detected, the padding portion is excluded from the compressed digital file to which the padding portion is added based on the information recorded in the file head padding portion. Read only data from the recording medium,
Create a new temporary compressed digital file, add the data read from the recording medium to the created temporary compressed digital file,
After data has been written and added to the end of the compressed digital file to which the padding portion has been added, the compressed digital file to which the padding portion has been added is deleted,
Changing the file name of the temporary compressed digital file to the same file name as the compressed digital file to which the padding portion is added;
A file division and coupling apparatus characterized by the above. 40. The file splitting and combining device according to claim 38.
The padding part deleting means is
When there are a plurality of compressed digital files to which the padding part is added in the recording medium, the recording medium required for deleting the padding part in the information regarding the padding part in the head padding part of each compressed digital file Compare the free space of and delete the padding part from the one with the small free space,
A file division and coupling apparatus characterized by the above. In a file dividing / combining apparatus for converting digital video / audio data compressed in MPEG format into a compressed digital file and dividing or combining the compressed digital files,
A randomly accessible recording medium for storing the compressed digital file;
Cluster boundary information acquisition means for acquiring cluster boundary information which is the minimum unit of recording of the recording medium;
GOP boundary information acquisition means for acquiring boundary information in units of GOP (Group Of Picture) which is the minimum unit for reproducing the compressed digital file;
Split file generation means for generating split files based on the cluster boundary information acquired by the cluster boundary information acquisition means and the GOP boundary information acquired by the GOP boundary information acquisition means;
A head padding unit generating means for generating, as a padding part, a vacant part from the head of the second half of the compressed digital file after division to the head GOP boundary;
An information file creating means for creating an information file for recording information related to the padding section in the recording medium;
Padding information generating means for generating information on a padding part of the compressed digital file in the information file;
A padding part deleting means for deleting the padding part of the compressed digital file based on the information recorded in the information file;
A file division and coupling apparatus characterized by the above. In a file dividing / combining apparatus for converting digital video / audio data compressed in MPEG format into a compressed digital file and dividing or combining the compressed digital files,
A randomly accessible recording medium for storing the compressed digital file;
Cluster combining means for combining the compressed digital files at a cluster boundary which is a minimum unit of recording of the recording medium;
GOP boundary information acquisition means for acquiring boundary information in units of GOP (Group Of Picture) which is the minimum unit for reproducing the compressed digital file;
Intermediate padding unit generating means for generating, as a padding unit, an empty portion from the end GOP boundary of the first half compressed digital file to be combined to the second half compressed digital file to be combined;
An information file creating means for creating an information file for recording information related to the padding section in the recording medium;
Padding information generating means for generating information on a padding part of the compressed digital file in the information file;
A padding part deleting means for deleting the padding part of the compressed digital file based on the information recorded in the information file;
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 40 or claim 41,
The padding part deleting means is
When the timing of combining the compressed digital file with the padding portion added with another compressed digital file is detected, the compression with the padding portion added is based on the information about the padding portion recorded in the information file. Only the data excluding the padding part from the digital file is read from the recording medium,
Write the data read from the recording medium to the other compressed digital file that is the combination destination,
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 40 or claim 41,
The padding part deleting means is
When the timing for reproducing the compressed digital file to which the padding portion is added is detected, the padding portion is extracted from the compressed digital file to which the padding portion is added based on the information related to the padding portion recorded in the information file. Read only the removed data from the recording medium,
Create a new temporary compressed digital file, add the data read from the recording medium to the created temporary compressed digital file,
Playback is performed up to the end of the compressed digital file to which the padding portion is added, and after the data is written and added to the end of the compressed digital file to which the padding portion is added, the compressed digital file to which the padding portion is added Delete
Changing the file name of the temporary compressed digital file to the same file name as the compressed digital file to which the padding portion is added;
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 40 or claim 41,
The padding part deleting means is
The padding unit is based on information related to the padding unit recorded in the information file when the timing of copying the compressed digital file with the padding unit added to a recording medium different from the recording medium is detected. Read only the data excluding the padding part from the compressed digital file to which is added, from the recording medium,
Creating a file with the same name as the compressed digital file to which the padding unit is added in the other recording medium, and adding the data read from the recording medium to the created compressed digital file with the same name;
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 40 or claim 41,
The padding part deleting means is
A padding unit is added from the compressed digital file to which the padding unit is added based on the information about the padding unit recorded in the information file when the timing at which the cleanup of the randomly accessible recording medium is instructed is detected. Read only the data excluding from the recording medium,
Create a new temporary compressed digital file, add the data read from the recording medium to the created temporary compressed digital file,
After data has been written and added to the end of the compressed digital file to which the padding portion has been added, the compressed digital file to which the padding portion has been added is deleted, and the file name of the temporary compressed digital file is added to the padding portion. To the same file name as the compressed digital file
A file division and coupling apparatus characterized by the above. The file division combining device according to claim 45,
The padding part deleting means is
When there are a plurality of compressed digital files to which the padding part is added in the recording medium, the free space of the recording medium necessary for deleting the padding part in the information related to the padding part in the information file is compared. And deleting the padding part from the one with the smallest free space,
A file division and coupling apparatus characterized by the above.

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