WO2005109867A1 - Procede d'extraction de donnees d'informations de service - Google Patents

Procede d'extraction de donnees d'informations de service Download PDF

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Publication number
WO2005109867A1
WO2005109867A1 PCT/CN2005/000623 CN2005000623W WO2005109867A1 WO 2005109867 A1 WO2005109867 A1 WO 2005109867A1 CN 2005000623 W CN2005000623 W CN 2005000623W WO 2005109867 A1 WO2005109867 A1 WO 2005109867A1
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WO
WIPO (PCT)
Prior art keywords
information
data
service information
transport stream
service
Prior art date
Application number
PCT/CN2005/000623
Other languages
English (en)
Chinese (zh)
Inventor
Hongtao Liao
Xun Liu
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 WO2005109867A1 publication Critical patent/WO2005109867A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17309—Transmission or handling of upstream communications
    • H04N7/17318—Direct or substantially direct transmission and handling of requests
    • 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
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/2362—Generation or processing of Service Information [SI]
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H04N21/4345—Extraction or processing of SI, e.g. extracting service information from an MPEG stream

Definitions

  • the invention relates to a database access method for retrieving service information, and belongs to the technical field of digital television reception. Background technique
  • Digital TV receiving equipment refers to hardware equipment that can receive, decode, and display digital TV signals. It is used in the field of digital TV and is a terminal for the realization of digitalization of analog TV (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.
  • a transport stream (TS 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 cooperates 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 builds the graphics layer and mixes it with the video in the PAL / NTSC analog signal request before sending.
  • 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.
  • a network corresponds to multiple transport streams, and a transport stream corresponds to multiple services.
  • Each network, each transport stream, and each service industry corresponds to an identifier (ID).
  • ID identifier
  • these information are divided into tables of different formats and encapsulated in TS (Transport stream) packets, each of which has a complete structure.
  • TS Transport stream
  • the original fragment is decomposed by the demultiplexer (Demux) to form tabular data.
  • These information tables are broadcast in the network at certain time intervals. The content of the broadcast may change with time, which is determined by the data broadcasting system.
  • 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 to provide a method for efficiently retrieving business information data.
  • the advantage of this method is that by establishing a service information database (SI Datebase) in a digital television receiving device (or set-top box) for storing and Manage digital television service information (SI), specifically network information (Network), transport stream information (Transport Stream), and service information (Service), so as to achieve the purpose of efficiently retrieving business information data.
  • SI Datebase service information database
  • Network network
  • Transport Stream Transport Stream
  • Service service information
  • a service information storage is set, and when the set-top box is started, the required network information, transport stream information, and service information are retrieved by scanning the set-top box, and stored in the form of a database table structure .
  • a type of related data may be stored in a certain memory area with a certain or non-deterministic structure.
  • a piece of data has its own length and other information, and an index is stored to determine the position of the next piece of data.
  • a data block with a specified number is retrieved by starting from the header of a table, determining the position of the next block according to the length information and position of each block, and comparing the block numbers to finally find the desired data block
  • a highly efficient information retrieval function is realized.
  • Tuning device table (DeviceContext table), network table (Network table), transport stream table (Transport Stream table), service information table (Service table "channel numbering table (Numbering table)
  • ID identifier
  • Key a key
  • uint8, uintl6, and uint32 identify 1-byte, 2-byte, and 4-byte unsigned integers respectively;
  • char [] represents a character string.
  • the storage structure of each table is as follows:
  • each unit of the tuning equipment table is 3 bytes, and the storage structure is as follows (the numbers represent the corresponding fields, the same below): Number Domain Name Variable Type Domain Length (Bytes) Description
  • each unit of the netlist is 12 bytes, and the storage structure is as follows (the numbers represent the corresponding fields, the same below)
  • the length of each unit of the transport stream table is 29 bytes, and the storage structure is as follows: Number Domain Name Variable Type Domain Length (Bytes) Description
  • the length of each unit of the service information table varies according to the number of elementary streams included in the service.
  • the storage structure is as follows:
  • a Stream part is composed of information of multiple elementary streams, and the length of each elementary stream information is 8 bytes, and the actual length of the part is determined by SreamCount.
  • AudioType int8 1 The type of the audio channel number table. The length of each unit is Count * 6 + 4 bytes.
  • the storage structure is as follows:
  • a group of ServiceKey and Properties represents a channel, with a total of Count, and the channel numbers are 1, 2, 3 ...
  • ServiceKey uint32 4 Key Properties for channel corresponding service uint32 2 Channel properties String table:
  • the length of each cell of the string table is variable, and the storage structure is as follows: 1 2 3 1 2 3 1 2 When looking up in the table, jump from one cell to the next cell according to the ID and length, up to the specified string cell.
  • the length of each unit of the proprietary data table is indefinite, and the storage structure is as follows:
  • Size represents the total length from a unit
  • a set of Tag, Length, and Data represents a descriptor with a total of Count descriptors.
  • All data of the business information database are stored in the form of tables in permanent storage, such as flash memory (Flash), hard disk, etc., and are loaded into random storage when the receiving device starts.
  • Each table is composed of different cells.
  • Each cell has a different key. It is an index to find related information. It is a zero-based cell sequence number that is used to distinguish different cells. For fixed-length cells, you can directly locate them in the table by key value and cell length; for cells of indefinite length, you can also search by order of cell length information and key value stored in each cell.
  • the data in the business information database is related by the corresponding identifier value and key value of each table. Zone of both
  • the value of the identifier is unique but not necessarily continuous, but the key values are continuous relative to the same table. This continuous feature makes it very convenient to find and locate data in the data table.
  • the relationship between the tables is shown in Figure 2.
  • the fields of the string are the same as those in the string table by their ID numbers.
  • StringID for example, ServiceNamelD in the business information table represents StringID in the string table
  • the proprietary data table is used to store some auxiliary and supplementary information. If a table has a private description identifier
  • the corresponding network key can be obtained, and the related information of the network can be obtained from the network information table.
  • the information of the transport stream and the service can be obtained according to the network id, the transport stream id, or the service id.
  • the function of the channel label table is to show the relationship between channels and services.
  • the structure of the channel number table is as shown above: Each number is represented by a NumberingID. Different digital TV operators can use different channel representations, and each representation is a number. On a numbered unit, a group of [service key, service properties] represents a channel. When searching, the given numbering id and channel number (that is, the location of [service key, service properties] in the numbering table) can uniquely determine the service corresponding to the channel.
  • 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 is the association between several tables of the business information database. It identifies several information tables to establish a relationship through a key value (Key), and finds the corresponding information in turn through the corresponding key value and identification (ID).
  • Key key value
  • ID identification
  • Embodiment 1 Filling of business information data.
  • the service information database was empty.
  • the network information table, the service information table (the necessary information tables for digital TV are: PAT, PMT, NIT, SDT or BAT, etc.) are loaded to obtain the network information, transport stream information, service name, corresponding information of digital TV transmission
  • a service information database is established according to the service information table defined by the method and the corresponding search relationship.
  • Embodiment 2 Retrieval of business information. It is assumed that necessary data is stored in the service information database, including a cable network, three transport streams in the network, and six sets of digital television programs, and these information are stored in a network information table, a transport stream table, and a service information table, respectively.
  • the channel number table stores the channel information corresponding to the six sets of programs, and the six sets of digital programs are represented from 1 to 6, respectively.
  • an application needs to switch from the current 4 channel to the 3 channel. It first needs to know which program is the 3 channel, which can be obtained from the channel number table, and includes the service key value Ser V i Ce Key of the corresponding channel. According to this, channel information can be obtained in the service information table, including the key value TransportStreamKey of the transport stream corresponding to the channel, and the corresponding transport stream information can also be obtained in the transport stream table through the TransportStreamKey. These information are used to switch channels. The most important thing is the frequency of the transport stream. Pass this frequency information to the hardware demodulator in the receiving device to switch to the transport stream where the program is. At this point, a channel switch is complete.
  • the present invention provides a method for efficiently retrieving a business information database and its design concept.
  • the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention.
  • those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without any modification or partial replacement that departs from the spirit and scope of the present invention, which should be covered by the claims among.

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

Abstract

L'invention concerne un procédé d'extraction de données d'informations de service. Les données d'informations de service sont utilisées pour le stockage et la gestion d'informations de réseau, d'informations sur les flux d'informations et d'informations de service appliquées à une application de télévision numérique. Elles peuvent être ajoutées ou extraites de manière appropriée par l'intermédiaire de l'interface d'application. Toutes les données de la base de données sont stockées sous forme de tables, dont une table de contexte de dispositif, une table de réseau, une table de flux de transport, une table d'informations de service, une table de numéros de canaux, une table d'enchaînements de données et une table de données privées. Toutes les tables sont associées à un Id et à une clé. Le procédé consiste à utiliser la stratégie d'index directe, de manière que les données puissent être extraites dans les tables ou placées dans celles-ci, rapidement et facilement. Il présente l'avantage de la vitesse par rapport au stockage de données sous forme de liste et résout également le problème de l'impossibilité de définition des blocs de données de longueur variable en cas de stockage des données sous forme de groupement.
PCT/CN2005/000623 2004-05-09 2005-05-08 Procede d'extraction de donnees d'informations de service WO2005109867A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200410018174.7 2004-05-09
CNB2004100181747A CN100438608C (zh) 2004-05-09 2004-05-09 一种检索业务信息数据的方法

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Publication Number Publication Date
WO2005109867A1 true WO2005109867A1 (fr) 2005-11-17

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Families Citing this family (8)

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CN101047818B (zh) * 2006-03-28 2013-06-12 友达光电股份有限公司 频道配置数据对调系统及方法
CN101276334B (zh) * 2007-03-29 2011-04-06 上海新跃仪表厂 一种快速检索数据的链表实现方法
CN101568011B (zh) * 2008-04-24 2012-04-04 乐金电子(中国)研究开发中心有限公司 一种快速搜索数字电视未加密服务的方法及装置
WO2010150750A1 (fr) * 2009-06-25 2010-12-29 Nishiyama Shuhei Dispositif de gestion de base de données qui utilise une mémoire de valeurs de clé avec des attributs, et dispositif de mise en mémoire cache de structure de mémoire de valeurs de clé pour ce dispositif
CN101945207B (zh) * 2010-09-17 2013-01-16 福建新大陆通信科技股份有限公司 一种基于机顶盒升级数据的二维索引表快速缓冲方法
CN101959006A (zh) * 2010-09-25 2011-01-26 深圳市迎风传讯科技有限公司 机顶盒处理节目的方法及机顶盒
CN102123323B (zh) * 2010-12-27 2012-10-24 四川长虹电器股份有限公司 一种单调谐器机顶盒电视节目快速更新的方法
CA2935145C (fr) 2014-01-17 2022-10-18 Sony Corporation Dispositif recepteur, procede de reception, dispositif emetteur et procede d'emission

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JPH11220703A (ja) * 1998-01-30 1999-08-10 Toshiba Corp 番組検索表示装置
CN1307429A (zh) * 1999-12-30 2001-08-08 汤姆森多媒体公司 构造数字电视服务数据库的方法及实现该方法的译码器
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Also Published As

Publication number Publication date
CN1571502A (zh) 2005-01-26
CN100438608C (zh) 2008-11-26

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