CN105867836A - Storage management method and apparatus as well as stream media system - Google Patents
Storage management method and apparatus as well as stream media system Download PDFInfo
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- CN105867836A CN105867836A CN201510036025.1A CN201510036025A CN105867836A CN 105867836 A CN105867836 A CN 105867836A CN 201510036025 A CN201510036025 A CN 201510036025A CN 105867836 A CN105867836 A CN 105867836A
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
Abstract
The invention discloses a storage management method and apparatus for a stream media system and the stream media system. The method comprises the steps of determining a to-be-formatted target disk; according to a storage space of the target disk, calculating the size of a large block region; according to block file attributes of a stream media file in the stream media system, setting large storage block attributes of the large block region; and formatting the target disk. By implementing the method and apparatus, the partial storage space of the disk is divided into the large block region comprising large storage blocks, the attributes of the large storage blocks are set according to the attributes of the block files in the stream media file for enabling the attributes of the large storage blocks to be consistent with those of the block files, and then the disk is formatted, so that the storage space occupied by metadata of the stream media file can be reduced during subsequent storage of the stream media file.
Description
Technical field
The present invention relates to the field of storage of stream medium data, particularly a kind of memory management method, device and stream media system.
Background technology
Large-scale stream media service has been widely applied to the every field such as amusement, education, business; due to stream medium data; as bigger in video file etc.; video file would generally be cut into the block file (such as 64MBB size) of fixed size, be stored in backstage distributed memory system (including multiple disk).nullDisk (such as ext2 in backstage storage system,ext3，XFS etc.) in units of block, distribute data block (each piece is only used for storing a file)，When the block size of front disk is 4KB，Although so that the memory space of disk gets the more reasonable use，But owing to the files in stream media such as video are the biggest，Store this class file to need to take the biggest data block，Such as，In the prior art，The video of storage 63MB size needs to take 16128 data blocks，The metadata of this video deserved is accomplished by including the positional information etc. of these 16128 data blocks，Cause that metadata is excessive takies bigger memory headroom，The most existing storage mode can produce the metadata of substantial amounts of file，When the file of storage becomes many and internal memory is more in short supply，The metadata of file can become the bottleneck of storage.
Therefore, how to provide a kind of memory technology that can reduce single files in stream media metadata, be those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
The invention provides the memory management method of a kind of stream media system, device and stream media system, the memory headroom shared by single files in stream media metadata can be reduced.
The invention provides the memory management method of a kind of stream media system, in one embodiment, the method comprises determining that target disk to be formatted；Memory space according to target disk calculates the size of bulk region；The big memory block attribute of bulk region is set according to the block file attribute of files in stream media in stream media system；Format target disk.
Further, the memory space according to target disk in above-described embodiment determines that the step of size of bulk region includes: using the 90% of memory space as bulk region.
Further, the step of big memory block attribute be set according to the block file attribute of files in stream media in stream media system include in above-described embodiment: according to the size of block file in block file attribute, the size of big memory block is set.
Further, in above-described embodiment after the memory space according to target disk calculates the size of bulk region, also include: the step of pocket including multiple little memory block is set on remaining memory space.
Further, the step arranging pocket on remaining memory space in above-described embodiment includes: little memory block be arranged on uniformly on target disk.
Further, above-described embodiment, after formatting target disk, also includes: receiving stream media file, distributes memory space for files in stream media, the metadata of files in stream media stores the file metadata district of target disk.
Further, the step for files in stream media distribution memory space in above-described embodiment includes: obtain the size of files in stream media；When files in stream media is less than big memory block, distribute a big memory block for files in stream media；When files in stream media more than big memory block, less than big memory block and preset number little memory block sum time, for files in stream media one big memory block of distribution and multiple little memory block；When files in stream media is more than big memory block and preset number little memory block sum, distribute multiple big memory blocks for files in stream media.
Further, above-described embodiment formatting after target disk, also includes: judges whether it is the file system of target disk according to the metadata of file system, the most then the metadata of the All Files in file system is read in internal memory.
Further, in above-described embodiment after the metadata of All Files is read in internal memory, also include: detect whether each file damages according to the metadata of each file, the memory block of file damaged of storage reclaimed.
The invention provides the memory management unit of a kind of stream media system, in one embodiment, comprising: select module, for determining target disk to be formatted；Divide module, calculate the size of bulk region for the memory space according to target disk；Module is set, for arranging the big memory block attribute of bulk region according to the block file attribute of files in stream media in stream media system；Management module, is used for formatting target disk.
Further, the management module in above-described embodiment is additionally operable to after formatting target disk, and receiving stream media file distributes memory space for files in stream media, the metadata of files in stream media stores the file metadata district of target disk.
Further, the management module in above-described embodiment is additionally operable to formatting after target disk, judges whether it is the file system of target disk according to the metadata of file system, the most then the metadata of the All Files in file system is read in internal memory.
Present invention provides a kind of stream media system, it includes the disk for stored stream media file, and the memory management unit provided such as the present invention.
Beneficial effects of the present invention:
The invention provides the way to manage of a kind of new disk storage space, by the part memory space of disk being divided into the bulk region including big memory block, and the attribute of these big memory blocks is set according to the attribute of block file in files in stream media, big memory block is consistent with the attribute of block file, and format diskette on this basis, so, when follow-up stored stream media file, it is possible to reduce memory space shared by the metadata of files in stream media；Further, the present invention is by the size being dimensioned to block file of big memory block, and when stored stream media file, a block file, just only for a big memory block, thus substantially reduces the space shared by the metadata of files in stream media.
Accompanying drawing explanation
The flow chart of the memory management method that Fig. 1 provides for first embodiment of the invention；
The schematic diagram of the memory management unit that Fig. 2 provides for second embodiment of the invention；
The flow chart of the memory management method that Fig. 3 provides for third embodiment of the invention；
Fig. 4 is the schematic diagram of the disk in third embodiment of the invention.
Detailed description of the invention
Now by the way of detailed description of the invention combines accompanying drawing, the present invention is made and further annotate explanation.
Memory management method involved in the present invention only includes the reformatting to disk, how stored stream media data and how to carry out the initialization of file system；The size of memory block and existing standard ext2 in disk after formatting, ext3, the memory block of the format disc such as XFS varies in size, and this reduces the quantity of memory block shared by single files in stream media, and then reaches to reduce the purpose in space shared by the metadata of files in stream media；How to access files in stream media for user, when file system initialization, the metadata of All Files in disk is read in internal memory, just can complete the access of respective file according to the metadata of these files.Hereafter involved file system refers to the auxiliary software of corresponding disk, and the metadata of file system includes corresponding disc information (such as title, size date of formation etc.)；Meta-data region storage in disk has the metadata of this disk in-list file, the metadata of ordinary file (such as files in stream media), and the index area storage in disk has the index information of free memory blocks in this disk.
First embodiment:
The flow chart of the memory management method that Fig. 1 provides for first embodiment of the invention, as shown in Figure 1, in the present embodiment, the memory management method that the present invention provides comprises the following steps:
S101: determine target disk to be formatted；
Owing to there are a lot of disks in distributed system, the effect of each disk may be not quite similar, and therefore, the application can be optimized management only for the disk for stored stream media file, and these need the disk being optimized management be designated as target disk；
S102: calculate the size of bulk region according to the memory space of target disk；
The memory space of disk can not be all for stored stream media file, in addition it is also necessary to storage alternative document, such as the metadata of file, the metadata of file system that disk is corresponding, the concordance list etc. of free memory blocks；Therefore, this step needs to calculate the region with a preferred size as bulk region according to the memory space of disk, this bulk region includes multiple big memory block, the size of these big memory blocks is much larger than Current standards ext2, standard storage block size in the format disc such as ext3, XFS, so, during storage same file, the quantity of shared big memory block also greatly reduces with regard to corresponding；
S103: the big memory block attribute of bulk region is set according to the block file attribute of files in stream media in stream media system；
The block file attribute of files in stream media changes along with the attribute of files in stream media, as audio file is different from the attribute of the single block file of video file, these attributes include the size of block file, reading manner, storage mode etc., big memory block attribute is set to when in files in stream media, the attribute of block file matches, it is possible to be greatly improved the space taken needed for read-write speed and the meta file that generated；
S104: format target disk；
Target disk, on the basis of above-mentioned steps, is formatted by this step, it is possible to setting is come into force.
In some embodiments, the memory space according to target disk in above-described embodiment determines that the step of the size of bulk region includes: using the 90% of memory space as bulk region.Because the disk space in stream media system is the biggest, it is usually more than 10T (1T=1024G), it is set to bulk region by 90%, just can reduce the quantity of disk block to greatest extent, and remaining 10% the most enough stores other data, or arranges some little memory blocks for flexible storage file.
In some embodiments, the step of big memory block attribute be set according to the block file attribute of files in stream media in stream media system include in above-described embodiment: according to the size of block file in block file attribute, the size of big memory block is set.Different system is when streaming media data process, the size of the block file being divided into there may be difference, as block file is defined as 64MB by some systems, other system is then to orientate 128MB as, each system can arrange the size of big memory block voluntarily according to the definition of the block file of its system streaming media files, can compatible more system, and, the size of big memory block is identical with block file size so that memory space can perfect utilize.
In some embodiments, in above-described embodiment after the memory space according to target disk calculates the size of bulk region, also include: the step of the pocket including multiple little memory block is set on remaining memory space.Arranging little memory block is for further Appropriate application disk space, if a files in stream media is 65MB size, system is classified as block file and the block file of a 1MB of a 64MB, it needs to take 2 memory blocks, if it takies the big memory block of 2 64MB, the space waste of 63MB will be caused, the present embodiment is by arranging little memory block, memory block such as 1MB size, so it is only this files in stream media one big memory block of distribution and a little memory block can complete storage, and do not waste memory space.
In some embodiments, the step arranging pocket on remaining memory space in above-described embodiment includes: little memory block be arranged on uniformly on target disk.The present embodiment is by distributing little memory block uniformly on disk, it is provided that the reading efficiency of little memory block.
Now for the realization of storage function of stream medium data, illustrate.
In some embodiments, embodiment illustrated in fig. 1, after formatting target disk, also includes: receiving stream media file, distributes memory space for files in stream media, the metadata of files in stream media stores the file metadata district of target disk.Because the present embodiment is to store on disk after the formatting by files in stream media, the quantity of the same memory block shared by files in stream media will be substantially less that memory block quantity shared when being stored in existing standard disk, corresponding, the metadata of this files in stream media will be greatly reduced.
In some embodiments, the step for files in stream media distribution memory space in above-described embodiment includes: obtain the size of files in stream media；When files in stream media is less than big memory block, distribute a big memory block for files in stream media；When files in stream media more than big memory block, less than big memory block and preset number little memory block sum time, for files in stream media one big memory block of distribution and multiple little memory block；When files in stream media is more than big memory block and preset number little memory block sum, distribute multiple big memory blocks for files in stream media.In actual applications, number n of the little memory block distributed for single files in stream media can set, as required such as 30, then, 30 is i.e. the preset number in the present embodiment.The present embodiment is stored stream media data by the way of big memory block combines with little memory block, can more reasonably utilize the memory space of disk, in actual applications, the size of single files in stream media is generally higher than the size of 30 little memory blocks, therefore, in order to reduce the metadata of stream medium data, directly start distribution from big memory block.Certainly, if the single memory space of little memory block is bigger or single files in stream media is the least, it is also possible to starting distribution from little memory block, this distribution method repeats no more.
After disk formatting, so that this disk can be used, it is necessary to update corresponding file system for this disk, having been given by definition above for file system, here is omitted.After file system needs to initialize, service just can be externally provided, therefore, in certain embodiments, embodiment illustrated in fig. 1 formatting after target disk, also includes: the initialization step of file system, and this initialization step includes: judge whether it is the file system of target disk according to the metadata of file system, the most then the metadata of the All Files in file system is read in internal memory.The present embodiment by when file system initialization just by disk in All Files metadata reading band internal memory in, when subsequent access, just can be substantially reduced the internal memory reading times to disk, just can access the contents such as corresponding stream medium data according to the metadata of file in internal memory.
In certain embodiments, in above-described embodiment after the metadata of All Files is read in internal memory, also include: detect whether each file damages according to the metadata of each file, the memory block of file damaged of storage reclaimed.The present embodiment achieves the recovery to disk space, avoid damaging file to continue to occupy memory space, these files include files in stream media (ordinary file), catalogue file etc., detecting whether each file damage can be by the verification in metadata and realization, hereafter having further instruction, this place repeats no more.
Second embodiment:
The schematic diagram of the memory management unit that Fig. 2 provides for second embodiment of the invention, as shown in Figure 2, in the present embodiment, the memory management unit 2 that the present invention provides includes: selects module 21, division module 22, arrange module 23 and management module 24, wherein,
Select module 21, for determining target disk to be formatted；
Divide module 22, calculate the size of bulk region for the memory space according to target disk；Calculation can be system default, or user individual is arranged；
Module 23 is set, for arranging the big memory block attribute of bulk region according to the block file attribute of files in stream media in stream media system；
Management module 24, is used for formatting target disk；Realize formatting the purpose of target disk by sending formatting command to target disk.
In certain embodiments, the management module 24 in above-described embodiment is additionally operable to after formatting target disk, and receiving stream media file distributes memory space for files in stream media, the metadata of files in stream media stores the file metadata district of target disk.
In certain embodiments, management module 24 in above-described embodiment is additionally operable to after formatting target disk, metadata according to file system judges whether it is the file system of target disk, the most then the metadata of the All Files in file system is read in internal memory.
Present invention provides a kind of stream media system, it includes the disk for stored stream media file, and the memory management unit provided such as the present invention.
Now by concrete application example the present invention done and further annotate explanation.
3rd embodiment:
The flow chart of the memory management method that Fig. 3 provides for third embodiment of the invention, from the figure 3, it may be seen that in the present embodiment, the memory management method that the present invention provides comprises the following steps:
S301: format diskette；
The mode of existing disk storage data is mainly improved by this step, and concrete includes: selected target disk, interior metadata fields of formatting diskette, the data field formatted diskette again divided block；In actual applications, the disk schematic diagram after formatting is as shown in Figure 4:
The selection of target disk can be given tacit consent to or user operation is carried out, and the application repeats no more；
Wherein disc information includes the information such as disk identifying code, size, storage size；
Data field includes bulk region and pocket, big memory block size identical with stream medium data block size (such as 64MB) in bulk region, in pocket, little memory block size could be arranged to 1MB (user can select to arrange voluntarily), for convenience of description, below and in accompanying drawing, the big memory block in bulk region being referred to as bulk, the little memory block in pocket is referred to as fritter, in order to improve read-write efficiency, by uniform for fritter respectively in disk；Owing to being the big file of fixed size after stream medium data piecemeal, so big block size is equal to the size of block file；Such as, marking off N number of bulk according to the 90% of total amount of capacity of remaining disk, keep for fritter by remaining 10%, the size of fritter is 1MBB (also can be customized for when system initialization)；Such as the disk of a 10T size, data field (memory space) size of this disk is generally slightly smaller than 10T, using 9T as bulk region, 147456 bulks are set, using 1T as pocket, 1048576 fritters are set, this shows, the partitioned mode of the present embodiment is (existing as a example by the standard storage block of 4KB size compared with the partitioned mode of existing standard disk, disk need to be divided into 2684354560 memory blocks), greatly reduce the quantity of memory block, when storing same file, also the content of file metadata will be greatly reduced, and then the memory space shared by reduction metadata；
Metadata fields includes directory metadata district, file metadata district, free block directorial area and target index area；Wherein, directory metadata district is for the metadata information of storing directory file, if the catalogue number of certain disk maximum support is 100,000, then this disk is just only capable of storing 100,000 catalogues, therefore the length in directory metadata district is fixed, and during formatting, directory metadata district is all set to 0；File metadata district, is used for storing the metadata of ordinary file (generally files in stream media) in disk, and preserves the list of idle bulk；Free block directorial area, is idle bulk and the list of fritter for safeguard；Directory index district is for storing the memory block list of various flows media data；
After completing above-mentioned setting, just send formatting command to disk, complete to format, update Disk Properties；
S302: receive and stored stream media data；
After distributed memory system receives files in stream media/catalogue file, need to be stored in band disk, after file destination is stored disk (typically small, to take one or several fritter), the metadata of catalogue file is write the directory metadata district of metadata fields；After files in stream media is stored disk (generally large, to take one or more bulk and fritter), the metadata of ordinary file is write the file metadata district of metadata fields；
During stored stream media culture, including the step for files in stream media distribution memory block, concrete may is that the size according to stream medium data and free memory blocks (including bulk and fritter) list are that this stream medium data distributes memory block, and be stored in the memory block of correspondence, now the metadata form of this stream medium data is as shown in table 1 below, and the storage list of this stream medium data includes the memory block list storing its data block；This step is mainly realized by the list in idle directorial area；
In actual applications, when stream medium data size is less than bulk, an idle bulk is distributed for it；If stream medium data size less than time after a bulk and n fritter, distributes an idle bulk, i idle fritter for it more than a bulk；If stream medium data size is more than time after a bulk and n fritter, less than two bulk sums, distribute two idle bulks for it, the like；N value size can be given tacit consent to or user specifies, the size sum=80%*1 of preferably n fritter block size greatly, the most both can avoid the excess waste of memory space, again will not be excessive take fritter；
Table 1
| Title | Verification and | Attribute | Bulk | Fritter |
| File 1 | …… | Do not extend | D(1) | |
| File 2 | …… | Do not extend | D(2) | S(1-3) |
| File 3 | …… | Extension | D(3、4) | S(4-7) |
| …… | …… | …… | …… | …… |
For the metadata of files in stream media, it is described in detail with reference to table 1:
For file 1, as shown in Table 1, this document has only taken up bulk D (1) when storage；
For file 2, as shown in Table 1, this document occupies bulk D (2) and 3 fritter S (1-3) when storage；
For file 3, as shown in Table 1, this document occupies multiple bulk D (3,4) and 4 fritter S (4-7) when storage, then just show extension in the attribute of its correspondence；
The initialization of the file system that S303: disk is corresponding；
So that disk can externally service, need the initialization of file system, comprise the following steps: whether judge streamed file system, correctly, this step mainly realizes by judging whether the metadata of file system meets with disc information, if not meeting, directly exit, if meeting, then the step externally presented of the All Files stored in entering disk:
The metadata of All Files in disk is read in internal memory, and the metadata reading internal memory of All Files can be avoided disk in order to read the metadata repeatedly reading to disk of file by this step, reduces interaction times, also provides the reading speed of file；All Files includes catalogue file and ordinary file (such as files in stream media etc.)；
In order to realize the Appropriate application to disk storage space, it is also possible to each file whether effectively/legal verify, if invalid/illegal, memory block shared by direct recovery fiel；
Can be by the verification of metadata with realize, as shown in table 1, carry in the metadata of file one verification and, after the metadata of this document is read internal memory, recalculate the metadata read verification and, compare both the most consistent, if it is consistent, then file is effective/legal, otherwise, invalid/illegal；
The most complete, the most then perform next step, if it is not, then remind user, flow process terminates；
S304: provide a user with streaming media service；
When user applies for accessing stream medium data, stream media system, according to the metadata of the files in stream media in internal memory, directly accesses disk, can be rapidly completed the reading of files in stream media, and the response to user operation.
In summary, by the enforcement of the present invention, at least there is following beneficial effect:
By the part memory space of disk being divided into the bulk region including big memory block, and the attribute of these big memory blocks is set according to the attribute of block file in files in stream media, big memory block is consistent with the attribute of block file, and format diskette on this basis, so, when follow-up stored stream media file, it is possible to reduce memory space shared by the metadata of files in stream media；
Further, the present invention is by the size being dimensioned to block file of big memory block, and when stored stream media file, a block file, just only for a big memory block, thus substantially reduces the space shared by the metadata of files in stream media；
Further, it is provided that the storage mode that size block combines so that the utilization of the memory space of disk is more reasonable；
Further, when file system initialization, the metadata of All Files in disk is all read in internal memory, when reducing follow-up use, internal memory and the interaction times of disk, internal memory performance can be reduced CPU and store the mutual of region with Appropriate application, reducing the iowait value of CPU when multithreading reads while write file；
Further, it is provided that the verification scheme that file is effective/legal, reclaim for the memory block shared by invalid/illegal file so that the utilization of the memory space of disk is more reasonable.
Below it is only the detailed description of the invention of the present invention; not the present invention is done any pro forma restriction; any simple modification, equivalent variations that embodiment of above is done by every technical spirit according to the present invention, combine or modify, all still fall within the protection domain of technical solution of the present invention.
Claims (13)
1. the memory management method of a stream media system, it is characterised in that including:
Determine target disk to be formatted；
Memory space according to described target disk calculates the size of bulk region；
According to the block file attribute of files in stream media in described stream media system, depositing greatly of described bulk region is set
Storage block's attribute；
Format described target disk.
2. memory management method as claimed in claim 1, it is characterised in that according to described target disk
Memory space determine that the step of size of bulk region includes: using the 90% of described memory space as described greatly
Block region.
3. memory management method as claimed in claim 1, it is characterised in that according to described Streaming Media system
In system, the block file attribute of files in stream media arranges the step of described big memory block attribute and includes: according to described piece
The size of block file in file attribute, arranges the size of described big memory block.
4. memory management method as claimed in claim 1, it is characterised in that according to described target magnetic
After the memory space of dish calculates the size of bulk region, also include: on remaining memory space, bag is set
Include the step of the pocket of multiple little memory block.
5. memory management method as claimed in claim 4, it is characterised in that at remaining memory space
On the step of pocket be set include: described little memory block is arranged on described target disk uniformly.
6. the memory management method as described in any one of claim 1 to 5, it is characterised in that at form
After changing described target disk, also include: receiving stream media file, for the distribution storage of described files in stream media
Space, stores the file metadata district of described target disk by the metadata of described files in stream media.
7. memory management method as claimed in claim 6, it is characterised in that for described files in stream media
The step of distribution memory space includes: obtain the size of described files in stream media；When described files in stream media is little
When big memory block, distribute a big memory block for described files in stream media；When described files in stream media is more than
Big memory block, less than big memory block with preset number little memory block sum time, distribute for described files in stream media
One big memory block and multiple little memory block；When described files in stream media is little with preset number more than big memory block
During memory block sum, distribute multiple big memory blocks for described files in stream media.
8. the memory management method as described in any one of claim 1 to 5, it is characterised in that at form
After changing described target disk, also include: judge whether it is target disk according to the metadata of file system
File system, the most then read in internal memory by the metadata of the All Files in described file system.
9. memory management method as claimed in claim 8, it is characterised in that by the unit of All Files
After data read in internal memory, also include: detect whether each file damages according to the metadata of each file, will deposit
The memory block of the file that storage damages reclaims.
10. the memory management unit of a stream media system, it is characterised in that including:
Select module, for determining target disk to be formatted；
Divide module, calculate the size of bulk region for the memory space according to described target disk；
Module is set, described for arranging according to the block file attribute of files in stream media in described stream media system
The big memory block attribute of bulk region；
Management module, is used for formatting described target disk.
11. memory management units as claimed in claim 10, it is characterised in that described management module is also
For formatting after described target disk, receiving stream media file, deposit for the distribution of described files in stream media
Storage space, stores the file metadata district of described target disk by the metadata of described files in stream media.
12. memory management units as described in claim 10 or 11, it is characterised in that described management mould
Block is additionally operable to, after formatting described target disk, to judge whether it is target according to the metadata of file system
The file system of disk, the most then read in internal memory by the metadata of the All Files in described file system.
13. 1 kinds of stream media systems, it is characterised in that include the disk for stored stream media file, and
Memory management unit as described in any one of claim 10 to 12.
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| CN201510036025.1A CN105867836A (en) | 2015-01-23 | 2015-01-23 | Storage management method and apparatus as well as stream media system |
| PCT/CN2015/090460 WO2016115920A1 (en) | 2015-01-23 | 2015-09-23 | Storage management method and apparatus and streaming media system |
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| CN111209259A (en) * | 2018-11-22 | 2020-05-29 | 杭州海康威视系统技术有限公司 | NAS distributed file system and data processing method |
| CN112256194A (en) * | 2020-09-30 | 2021-01-22 | 新华三技术有限公司成都分公司 | Storage space distribution method and storage server |
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| CN111209259B (en) * | 2018-11-22 | 2023-09-05 | 杭州海康威视系统技术有限公司 | NAS distributed file system and data processing method |
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| CN109995595B (en) * | 2019-04-11 | 2022-02-18 | 苏州浪潮智能科技有限公司 | RGW quota determining method, system, equipment and computer medium |
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| WO2016115920A1 (en) | 2016-07-28 |
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