WO2005109880A1 - Procede d'acces aux donnees carousel par systeme de fichier - Google Patents

Procede d'acces aux donnees carousel par systeme de fichier Download PDF

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Publication number
WO2005109880A1
WO2005109880A1 PCT/CN2005/000626 CN2005000626W WO2005109880A1 WO 2005109880 A1 WO2005109880 A1 WO 2005109880A1 CN 2005000626 W CN2005000626 W CN 2005000626W WO 2005109880 A1 WO2005109880 A1 WO 2005109880A1
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WO
WIPO (PCT)
Prior art keywords
data
file system
carousel
accessing
digital television
Prior art date
Application number
PCT/CN2005/000626
Other languages
English (en)
Chinese (zh)
Inventor
Xiangzhong Fang
Hongtao Liao
Haisheng Sun
Original Assignee
St Microelectronics Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by St Microelectronics Nv filed Critical St Microelectronics Nv
Publication of WO2005109880A1 publication Critical patent/WO2005109880A1/fr

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Classifications

    • 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

Definitions

  • the invention relates to a method for randomly accessing carousel data through a file, and particularly to a technology for performing random access and effective extraction of data in a digital television receiving device based on a data carousel format and a protocol technology. It belongs to the field of digital television receiving technology.
  • Digital television receiving equipment generally refers to hardware equipment capable of receiving, decoding, and displaying digital television signals. It is applied in the field of digital television and is a terminal for the realization of digitization of analog television (see Figure 1). Digital television receiving equipment receives digital image and data information. Therefore, unlike traditional analog television signal receiving and processing, digital television receiving equipment receives and processes digital image information and data through its internal CPU. And peripheral devices connected to it.
  • the receiving system is based on the corresponding hardware and operating system to develop applications suitable for digital television receiving equipment; Similarly, some professional digital broadcast content service providers also need to develop according to the hardware performance and functions of different digital television receiving equipment Corresponding service software.
  • TS stream transport stream
  • the transmission stream is modulated to form an electromagnetic signal and transmitted to a digital television receiving device.
  • set-top box The working principle of digital TV receiving equipment (set-top box) is as follows-
  • the tuning / selection module receives electromagnetic signals and selects a certain range of bandwidth.
  • the demodulation module converts signals into data streams (Bitstreams :).
  • the demultiplexing module extracts the desired information from the data streams (Bitstreams) and provides it to different decoders in a suitable way. It includes a descrambler that works with the conditional access module.
  • the video decoding module converts the video bit stream in the displayed image sequence.
  • the audio decoding module converts the audio bit stream in the analog audio signal.
  • the graphics engine creates the graphics layer and mixes it with the video in the PAL / NTSC analog signal request before sending it.
  • the front control panel is responsible for interpreting user commands issued by the remote control, wireless keyboard or front panel.
  • the video bit stream and audio bit stream are mixed with the image through the image processor, and become analog audio and video signals, which are output to the display screen (TV).
  • the data stream flows into the CPU through the demultiplexer and is processed by the system program running on the central processing unit (CPU). The processed results can be mixed with the audio and video streams and output to the display device.
  • Digital TV adds a large number of data services on the basis of the original audio and video services.
  • Data is circulated in a carousel manner and broadcasted to the digital TV receiving device in a TS stream with digital TV signals.
  • the data carousel (Data Carousel) technology is based on the ISO / IEC13818-6 standard DSM-CC technology.
  • the data turntable for digital TV broadcasting is based on the DSM-CC data turntable.
  • the data in the turntable is sent in the form of modules, and each module is divided into multiple data blocks of the same size.
  • the object turntable for digital television broadcasting is based on the DSM-CC object turntable.
  • Each turntable represents a special service domain.
  • This domain consists of a collection of DSM-CC UU objects. These objects include files, directories, events, As well as stream events.
  • the data carousel protocol uses messages to encapsulate data and control information.
  • the directory structure information of the data to be broadcast is transmitted by the data table DSI (DownloadServerlnitiate) message and DII (Downloadlnfolndirection) message, and the actual data file is transmitted.
  • DSI DownloadServerlnitiate
  • DII Downloadlnfolndirection
  • DDB DownloadDataBlock
  • a module is a collection of logically independent data. Multiple modules can form a group, and multiple groups can form a supergroup.
  • the DSI message describes the information of the group in the super group; the DII message describes the information of the modules in the group.
  • the receiving device can decide which modules to receive based on the control message.
  • the transmission format of carousel data is shown in Figure 1.
  • VFS Virtual File System
  • Both the data carousel method and the object carousel method can transfer data through a carousel. However, to get To fetch these data, they need to be loaded instantly and stored in the cache. However, for applications that need to use this data, the above method is very inconvenient and time consuming.
  • the method of the present invention is a solution proposed for the deficiency of traditional technology. Summary of the invention
  • the technical problem to be solved by the present invention is a method for a file system to access carousel data.
  • the advantage of this method is that by setting a data buffer in the digital TV receiving device, the data transmitted from the digital TV data signal and transmitted through the carousel protocol is stored in the data buffer.
  • the data buffer is associated with the file system and is directly applied during application. Access the data as a normal file, thereby eliminating the tedious acquisition of carousel data.
  • the present invention solves the above problems through the following technical solutions.
  • the method of the present invention is to set a cache, which is associated with the cache through a traditional file system (such as a virtual file system VPS).
  • a traditional file system such as a virtual file system VPS.
  • the present invention provides a transmission method based on a DSM-CC turntable, which acquires data through a directory file system.
  • This method is applicable to both DSM-CC Data Carousel and Object Carousel.
  • the difference between the two protocols is only reflected in the different data loading methods.
  • the following uses the data carousel (or data carousel) as an example to explain how to establish a cache and associate the file system with the carousel data, so as to achieve the purpose of effectively obtaining data through the file system.
  • Service Gateway responsible for providing external public interfaces and coordinating the task execution of each module of the system
  • DSM FS DSM file system, which provides an operation interface associated with the upper file system.
  • cache The role of cache (cache): cache is used to access already loaded data, so that there is no need to load data frequently.
  • a Carousel When a Carousel is cached, all DSI and DII messages will be received first, and the entire file system structure will be cached, but when an application calls a certain file, it will temporarily obtain it from the channel and cache it. After a file is used and closed, the memory occupied by it can be released.
  • the structure of the cache uses DDB as the basic unit of the cache.
  • a Carousel corresponds to a Group linked list. Each Group node points to a Module linked list, and each Module node points to a DDB linked list.
  • the structure of the cache is shown in Figure 3.
  • DSM FS Association with file system
  • the DSM-CC data cache itself does not have a conventional file system.
  • the cache data should be associated with a file system so that the data can be accessed through the file system.
  • the organizational structure of the upper file system does not need to be the same as that of the cache.
  • DSM-CC and file systems (such as VFS) need to define the data structures and functions necessary for file system association.
  • FIG. 1 is a block diagram of the operation of digital television equipment.
  • the digital TV signal enters the receiving device and is processed by the demodulation and demultiplexing module to separate the audio and video signals from the data signal.
  • the event information data carried in the data signal is processed and stored for display on the TV screen.
  • Figure 2 shows the organization of carousel data.
  • the transmitted data is stored in modules; each module is divided into several data blocks.
  • all data blocks of a module have the same length except the last data block of each module.
  • a module is a collection of logically independent data. Multiple modules can form a group, and multiple groups can form a supergroup.
  • the data carousel protocol uses messages to encapsulate data and control information. Data is carried by DDB messages; control is carried by DII, DSI and other messages.
  • the DSI message describes the information of the group in the super group; the DII message describes the information of the modules in the group.
  • the receiving device can decide which modules to receive according to the control message.
  • FIG. 3 shows the structure of the file system.
  • the Flash module is used as a driver of the file system, which is a readable and writable storage module;
  • DSMCC is used as another driver of the file system, which is readable but not writable because it is a circular carousel System, writing is meaningless.
  • Figure 4 shows the module structure of DSM-CC data and its association with the file system.
  • the Org.dvb.dsmcc module indicates through the SG interface that a carousel needs to be loaded into the cache. VFS can then access data through common functions of the file system.
  • FIG. 5 shows the organizational structure of the Cache: Cache uses a hierarchical storage structure and is classified by DSI (Carousel Node)-> DII (Group Node)-> Module.
  • DSI Carousel Node
  • DII Group Node
  • MBT—DlAttachGateway () mounts the corresponding data carousel on the VFS file system.
  • DSI and DII tables need to be loaded to obtain specific data organization structure.
  • VFS virtual file system
  • the following operations need to be performed: a) Define the type of DSM-CC file system: Its name is: "dsmfs"; b) Define the structure of file system spuer- block and inode; c) Define three methods of file system super- operation operation: void (* read — Inode) (struct inode *), void (* put_super) (struct super— block *), int (* statfs) (struct super— block *, struct statfs *. Int)
  • d) Define the four methods required for file inode operations on the file system: dsmfs_file— operations, dsmfs—file—inode—create ,, dsmfs— inode— lookup, dsmfs— inode— unlink e) Define the three required dir inode operations for the file system Methods: dsmfs—dir— operations, dsmfs_inode_looku, dsmfs_inode_ unlink f) Three methods to define the file system file—operation read and write: dsmfs— file— read, dsmfs— file— write, dsmfs— file— readdir ⁇
  • the function of the VFS file system operation is called to access the file, and DDB messages are loaded at this time to provide specific data.
  • the present invention provides a method for accessing carousel data through a file system and its design concept.
  • the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention.
  • the invention has been described in detail, and those of ordinary skill in the art should understand that the invention can still be modified or equivalently replaced without any modification or partial replacement that departs from the spirit and scope of the invention, which should be covered by the rights of the invention Among the requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

L'invention concerne un procédé d'accès aux données Carousel par système de fichier, et en particulier une technique d'accès aléatoire et d'extraction efficace de données sur la base du format et du protocole Carousel dans un récepteur de télévision. Le domaine décrit est celui de la réception télévisuelle numérique. On entend par données Carousel la technique de transmission appliquée en télévision numérique selon le protocole de transmission de données de la norme ISO/13818-6, mais en protocole standard ladite technique n'est pas liée à un système de fichier, ce qui la rend compliquée en termes d'acquisition des données. On décrit un procédé de stockage des données dans un tampon, et d'association des données à un système de fichier (par exemple, système de fichier virtuel). Ainsi, l'accès aux données Carousel n'est pas aussi aléatoire que l'accès au fichier local, rendant efficace et commode l'accès aux données.
PCT/CN2005/000626 2004-05-09 2005-05-08 Procede d'acces aux donnees carousel par systeme de fichier WO2005109880A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200410018173 CN1784005B (zh) 2004-05-09 2004-05-09 一种通过文件系统访问轮播数据的方法
CN200410018173.2 2004-05-09

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Publication Number Publication Date
WO2005109880A1 true WO2005109880A1 (fr) 2005-11-17

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WO (1) WO2005109880A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101358501B1 (ko) 2007-12-14 2014-02-05 엘지전자 주식회사 데이터 방송 수신기 및 데이터 방송 어플리케이션의 게더링방법
CN106686444B (zh) * 2016-12-30 2020-02-28 深圳市九洲电器有限公司 基于dsm-cc协议的对象轮播数据下载方法及系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001008176A (ja) * 1999-06-24 2001-01-12 Matsushita Electric Ind Co Ltd 放送受信装置
JP2001245272A (ja) * 1999-12-07 2001-09-07 Sony Service Center Europ Nv 通信プロトコル方法、オブジェクトカルーセル及びサーバ装置
JP2002044547A (ja) * 2000-07-26 2002-02-08 Sharp Corp デジタルテレビ放送受信装置
CN1462554A (zh) * 2001-05-04 2003-12-17 皇家菲利浦电子有限公司 互动应用的记录

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999065230A2 (fr) * 1998-06-12 1999-12-16 Koninklijke Philips Electronics N.V. Systeme de transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001008176A (ja) * 1999-06-24 2001-01-12 Matsushita Electric Ind Co Ltd 放送受信装置
JP2001245272A (ja) * 1999-12-07 2001-09-07 Sony Service Center Europ Nv 通信プロトコル方法、オブジェクトカルーセル及びサーバ装置
JP2002044547A (ja) * 2000-07-26 2002-02-08 Sharp Corp デジタルテレビ放送受信装置
CN1462554A (zh) * 2001-05-04 2003-12-17 皇家菲利浦电子有限公司 互动应用的记录

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CN1784005B (zh) 2010-11-24

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