CN1784005A - Method for access rotational broadcast data through file system - Google Patents
Method for access rotational broadcast data through file system Download PDFInfo
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- CN1784005A CN1784005A CN 200410018173 CN200410018173A CN1784005A CN 1784005 A CN1784005 A CN 1784005A CN 200410018173 CN200410018173 CN 200410018173 CN 200410018173 A CN200410018173 A CN 200410018173A CN 1784005 A CN1784005 A CN 1784005A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 230000003139 buffering effect Effects 0.000 claims description 2
- 241001269238 Data Species 0.000 claims 1
- 238000012545 processing Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007620 mathematical function Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
- H04N21/643—Communication protocols
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
- H04N21/262—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists
- H04N21/26266—Content or additional data distribution scheduling, e.g. sending additional data at off-peak times, updating software modules, calculating the carousel transmission frequency, delaying a video stream transmission, generating play-lists for determining content or additional data repetition rate, e.g. of a file in a DVB carousel according to its importance
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- Multimedia (AREA)
- Signal Processing (AREA)
- Databases & Information Systems (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
This invention relates to a method for addressing carousel by file, especially relating to a technology for random accessing data and effectively extracting data based on data carousel format and protocol in digital television receiving equipment. Said carousel data is a data transmitting technology applied in digital television field based on ISO/13818-6 data transmission protocol, but in standard large protocol it does not correspond with file system, the data accessing is complex. Said invention provides a method for storing data in buffer memory and corresponded with a kind of file system (such as virtual file system VFS) to obtain high speed data addressing.
Description
Technical field
The present invention relates to a kind of method, be meant a kind of technology of in apparatus of digital television receiving, data being carried out random access and effectively extracting especially based on data carousel form and protocol technology by file random access wheel multicast data.Belong to Digital Television reception technique field.
Background technology
The apparatus of digital television receiving general reference can receive, decodes and show the hardware device of digital television signal, and it is applied to digital TV field, is the terminal (see figure 1) that the simulated television digitlization is achieved.What apparatus of digital television receiving received is digitized image and data message, therefore, be different from the reception and the processing of traditional anolog TV signals, apparatus of digital television receiving is to be undertaken by its inner CPU and coupled peripheral components to the reception and the processing of digitized image information and data.Receiving system is exactly to develop the application program that apparatus of digital television receiving is suitable on the basis of relevant hardware and operating system; Equally, some professional digital broadcast content service providers also need to go out corresponding service software according to the hardware performance and the functional development of different apparatus of digital television receiving.
In the broadcasting equipment of TV station or television operator, audio-video signal mixes with the multiplexer of data content through front end, forms transport stream (TS stream).Transport stream forms electromagnetic signal through ovennodulation and is sent in the apparatus of digital television receiving.Apparatus of digital television receiving (set-top box) work principle is as follows:
Video bit stream in the image sequence that the video decode module converts shows.
The front control board is partly explained by receiving the user command that remote controller, Wireless Keyboard or front panel send.
Video bit stream mixes with image through image processor mutually with audio bit stream, becomes the audio-video signal of simulation, outputs on the display screen (television set).Data flow then flow among the CPU by demodulation multiplexer, is handled by the system program of going up operation at central processing unit (CPU).The result who handles can mix with audio/video flow, outputs on the display device.
Digital Television has increased the lot of data business on the basis of original audio frequency and video business, data are broadcast to apparatus of digital television receiving with digital television signal by the mode that TS flows by the circulation of wheel broadcast mode.The data carousel technology is stipulated according to ISO/IEC13818-6 standard DSM-CC technology.The data carousel mode mainly contains two kinds of data carousel and object carousels.The data carousel that digital television broadcasting is used is based upon on the DSM-CC data carousel basis, and the data in the rotating disk send with the form of module, and each module is divided into the identical data block of a plurality of sizes again.The object carousel that digital television broadcasting is used is based upon on the DSM-CC object carousel basis, and each rotating disk is represented a special service-domain, and this territory is made of DSM-CC U-U object set, and these objects comprise file, catalogue, incident and stream incident.According to the ISO/IEC13818-6 standard, the data carousel agreement uses message to come encapsulation of data and control information, the bibliographic structure information of the data of broadcasting is transmitted by data form DSI (DownloadServerInitiate) message and DII (DownloadInfoIndirection) message, the data file of reality is put into the defined DownloadDataBlock of data carousel agreement (DDB) message transmit.In a data carousel, except that last data block of each module, all data blocks of module all have same length.Module is the independently set of data in logic, and a plurality of modules can be formed a group (Group), and a plurality of groups (Group) then forms one super group (SuperGroup).The DSI message semantic definition information of the group in super group; The DII message semantic definition information of module in the group.Which module receiving equipment can determine to receive according to control messages.The form of broadcasting of wheel multicast data is seen Fig. 1.
In the computing technique in modern times, the institutional framework of data generally realizes by file system.Virtual File System (VFS) is a kind of file system organization structure technology commonly used.And at digital TV field, because the data of broadcasting by the DSM-CC mode are the form broadcasting by list structure, how will take turns multicast data and combine with the VFS file system with associating and do not have specific technology at present.
No matter be that data carousel method or object carousel method can both transmit data by the mode that wheel is broadcast.Yet, obtain these data, they instant loadings need be deposited in the buffer memory.But for the application that needs use these data, said method inconvenience very is consuming time loaded down with trivial details.
Method of the present invention is exactly the solution that proposes at the deficiency of conventional art.
Summary of the invention
The technical problem to be solved in the present invention is a kind of method of file system access wheel multicast data.The benefit of this method is by a data buffering area is set at apparatus of digital television receiving, the wheel that passes through that obtains from the digital TV data signal is broadcast the storage of protocol transmission in the data buffer zone, data buffer zone and file system link, directly with the mode visit data of ordinary file, take turns loaded down with trivial details that multicast data obtains during application thereby eliminate.
The present invention is resolved above problem by following technical scheme.Method of the present invention is to set a kind of buffer memory, by traditional file system (as by Virtual File System VFS) therewith buffer memory be associated, when needs obtain the wheel multicast data, only need open and read corresponding file, thereby convenient the use improved the reaction speed and the data utilization ratio of apparatus of digital television receiving.
Describe technical scheme of the present invention below in detail.
The step of this method:
The invention provides a kind of transmission method, obtain data by the mode of directory file system based on the DSM-CC rotating disk.No matter be DSM-CC data carousel agreement (Data Carousel) or object carousel agreement (Object Carousel), this method all is suitable for for them.The difference of these two kinds of agreements just is embodied in the difference of data load mode.Be that example illustrates how to set up buffer memory and file system is associated with taking turns multicast data with data carousel (or claim data carousel) below, thereby reach the purpose of effectively obtaining data by file system.
Carry out the loading of DSM-CC wheel multicast data, and they and file system carried out related, following several submodule is generally arranged:
1. Service Gateway: be responsible for providing external common interface, and the task of coordinating this each module of system is carried out;
2. Cache: be responsible for the relevant file data of storage, and provide and search and delete function;
3. DSM FS:DSM file system provides with the topmost paper system and carries out related operation-interface.
The effect of Cache (buffer memory): cache is used for the data that access has been loaded, and makes to need not loading data frequently.When Carousel of buffer memory, with at first receiving all DSI and DII message, whole file system structure buffer memory is got off, but during certain file of application call, from channel, obtain, and buffer memory gets off temporarily.After using a file and being closed, its shared internal memory already can be released.The structure of Cache is with the elementary cell of DDB as buffer memory, the corresponding Group chained list of Carousel, and each Group node points to a Module chained list, and each Module node points to a DDB chained list.The structure of Cache is seen Fig. 3.
Related (DSM FS) with file system: DSM-CC data cache itself is a file system sanctified by usage not, the convenience of obtaining for data, should the Cache data are related with a file system, make and can visit data by file system.The institutional framework of the file system on upper strata does not need identical with organizing of Cache.Need necessary data structure of defined file system relationship and function DSM-CC and the file system (as VFS).
Below by accompanying drawing method of the present invention is described further.
Description of drawings
Fig. 1 is the block diagram of digital television devices work.Digital television signal enters receiving equipment, through the processing of demodulation Multiplexing module, audio-video signal and data-signal is separated, and event information data entrained in the data-signal is used to be presented at television screen through handling and storage.
Fig. 2 has shown the institutional framework of wheel multicast data.In data carousel, the data of transmission are stored in the module (Module); And each module is divided into plurality of data piece (Block).In a data carousel, except that last data block of each module, all data blocks of module all have same length.Module is the independently set of data in logic, and a plurality of modules can be formed a group (Group), and a plurality of groups (Group) then forms one super group (SuperGroup).The data carousel agreement uses message to come encapsulation of data and control information.Data are carried by DDB message; Control is then by DII, and message such as DSI are carried.The DSI message semantic definition information of the group in super group; The DII message semantic definition information of module in the group.Which module receiving equipment can determine to receive according to control messages.
Fig. 3 has shown the structure of file system.In the present invention, the Flash module is as a driving of file system, and it is the readable memory module of writing; DSMCC drives as another of file system, and it is readable and can not write, because it is a system that the circulation wheel is broadcast, it is nonsensical writing.
Fig. 4 has shown the modular structure of DSM-CC data and related with file system.The Org.dvb.dsmcc module need be taken turns certain by SG interface indication and be broadcast (Carousel) and be loaded into Cache.VFS just can carry out the visit of data by the common mathematical function of file system then.
Fig. 5 has shown that the institutional framework of Cache: Cache adopts level memory structure, press DSI (Carousel Node)-＞DII (Group Node)-＞Module classifies.
The present invention is described in further detail below in conjunction with concrete embodiment.
Embodiment
Concrete execution mode is as follows:
1. obtain the information of wheel multicast data
Load pmt table, analyze the stream_identifier_descriptor descriptor, load EIT or SDT table, analyze the data_broadcast_descriptor descriptor, obtain the information such as rank that type that pid information that data broadcast and wheel broadcast and wheel are broadcast.
Call the data_broadcast_descriptor descriptor that MBT_SilGetCarouselInfo () obtains to be needed.
2. related wheel is broadcast
When the DSM-CC module starts,, call MBT_DlAttachGateway () data carousel of correspondence is mounted on the file system of VFS according to the data_broadcast_descriptor descriptor that obtains.
When association wheel multicast data, need to load DSI and DII table to obtain concrete data organizational structure.When related, need carry out following operation with Virtual File System VFS:
A) type of definition DSM-CC file system: its name is called: " dsmfs ";
B) structure of spuer_block of defined file system and inode;
C) three method: void (* read_inode) (struct inode*) of the super_operation of defined file system operation, void (* put_super) (struct super_block*), int (* statfs) (struct super_block*, struct statfs*, int)
D) four method: dsmfs_file_operations of the file inode of defined file system action need, dsmfs_file_inode_create,, dsmfs_inode_lookup, dsmfs_inode_unlink;
E) three method: dsmfs_dir_operations of the dir inode of defined file system action need, dsmfs_inode_lookup, dsmfs_inode_unlink;
F) three method: dsmfs_file_read of the file_operation of defined file system read-write, dsmfs_file_write, dsmfs_file_readdir
G) read method of the dir operation of defined file system directory operation: dsmfs_dir_readdir;
H) definition DSM-CC file system is registered to the method for VFS file system:
register_filesystem(&dsmfs_fs_type)；
I) method of the cancellation of definition DSM-CC file system:
unregister_filesystem(&romfs_fs_type)。
According to above-mentioned steps, by realizing described structure and method, with DSM-CC and VFS file system just related get up.
3. file operation
Call the function access file of VFS file system operation, load DDB message so that concrete data to be provided this moment.
It should be noted last that: the present invention is to provide a kind of method and design philosophy thereof by file system access wheel multicast data, above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (4)
1. method by file system access wheel multicast data.It is characterized in that: a data buffering area is set at apparatus of digital television receiving, the wheel that passes through that obtains from the digital TV data signal is broadcast the storage of protocol transmission in the data buffer zone, data buffer zone and file system link, during application directly with the mode visit data of ordinary file.
2. a kind of method according to claim 1 by file system access wheel multicast data, it is characterized in that, it is by corresponding data format of definition and data read, construct a DSM file system, make data function and file system associate, the function that makes upper layer application directly call file system visits data.
3. according to claim 1 and 2 described a kind of methods by file system access wheel multicast data, it is characterized in that, concrete data carousel form that its is handled and agreement can be to meet ISO/13818-6 standard institute specification data wheel to broadcast (Data Carousel) and object carousel (Object Carousel), also can be other the formatted datas by other host-host protocol transmission.
4. according to claim 1 and 2 described a kind of methods, it is characterized in that being used for related topmost paper system can be general Virtual File System, also can be other tree file system by file system access wheel multicast data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410018173 CN1784005B (en) | 2004-05-09 | 2004-05-09 | Method for access rotational broadcast data through file system |
| PCT/CN2005/000626 WO2005109880A1 (en) | 2004-05-09 | 2005-05-08 | A method for accessing carousel data via file system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410018173 CN1784005B (en) | 2004-05-09 | 2004-05-09 | Method for access rotational broadcast data through file system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1784005A true CN1784005A (en) | 2006-06-07 |
| CN1784005B CN1784005B (en) | 2010-11-24 |
Family
ID=35320596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410018173 Expired - Lifetime CN1784005B (en) | 2004-05-09 | 2004-05-09 | Method for access rotational broadcast data through file system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1784005B (en) |
| WO (1) | WO2005109880A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101904121B (en) * | 2007-12-14 | 2012-10-03 | Lg电子株式会社 | Data broadcast receiver and method for gathering data broadcasting application |
| CN106686444A (en) * | 2016-12-30 | 2017-05-17 | 深圳市九洲电器有限公司 | Object carousel data downloading method and system based on DSM-CC (digital storage media command and control) protocol |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322739C (en) * | 1998-06-12 | 2007-06-20 | 皇家菲利浦电子有限公司 | Transmission system |
| JP2001008176A (en) * | 1999-06-24 | 2001-01-12 | Matsushita Electric Ind Co Ltd | Broadcasting receiver |
| GB2357922A (en) * | 1999-12-07 | 2001-07-04 | Sony Service Ct | Optimising a data carousel |
| JP2002044547A (en) * | 2000-07-26 | 2002-02-08 | Sharp Corp | Digital television broadcast receiver |
| GB0111008D0 (en) * | 2001-05-04 | 2001-06-27 | Koninkl Philips Electronics Nv | Recording of interactive applications |
-
2004
- 2004-05-09 CN CN 200410018173 patent/CN1784005B/en not_active Expired - Lifetime
-
2005
- 2005-05-08 WO PCT/CN2005/000626 patent/WO2005109880A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101904121B (en) * | 2007-12-14 | 2012-10-03 | Lg电子株式会社 | Data broadcast receiver and method for gathering data broadcasting application |
| US8707362B2 (en) | 2007-12-14 | 2014-04-22 | Lg Electronics Inc. | Data broadcast receiver and method for gathering data broadcasting application |
| CN106686444A (en) * | 2016-12-30 | 2017-05-17 | 深圳市九洲电器有限公司 | Object carousel data downloading method and system based on DSM-CC (digital storage media command and control) protocol |
| WO2018120999A1 (en) * | 2016-12-30 | 2018-07-05 | 深圳市九洲电器有限公司 | Dsm-cc protocol-based method and system for downloading object carousel data |
| CN106686444B (en) * | 2016-12-30 | 2020-02-28 | 深圳市九洲电器有限公司 | Object carousel data downloading method and system based on DSM-CC protocol |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1784005B (en) | 2010-11-24 |
| WO2005109880A1 (en) | 2005-11-17 |
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Granted publication date: 20101124 |