CN114221942B - Method for detecting data broadcast in transport stream - Google Patents

Method for detecting data broadcast in transport stream Download PDF

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CN114221942B
CN114221942B CN202111522126.1A CN202111522126A CN114221942B CN 114221942 B CN114221942 B CN 114221942B CN 202111522126 A CN202111522126 A CN 202111522126A CN 114221942 B CN114221942 B CN 114221942B
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service
network
operator
data broadcasting
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CN114221942A (en
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闫文志
周真荣
刘建华
张美青
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Hangzhou Nationalchip Science & Technology Co ltd
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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]
    • H04N21/20—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
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2665—Gathering content from different sources, e.g. Internet and satellite
    • 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 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6143—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a satellite
    • 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]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The invention discloses a method for detecting data broadcast in a transport stream. The method of the invention inserts the appointed operator network information sub-table and the service group association sub-table in the transmission stream at the front end of the satellite broadcasting network, and is used for indicating the existence of the appointed operator data broadcasting service in the transmission stream. Defining private fields in link descriptors of a service group association table, associating service identifiers carrying data broadcasting services with component tags, and inserting descriptors in a program association table and a program mapping table to complete association of the component tags with transport stream packet identifiers. The set top box filters and analyzes the transmission stream by presetting frequency point information, a network identifier and a service group identifier of a designated operator, detects whether a data broadcasting service provided by the designated operator exists in the transmission stream, and acquires a transmission stream packet identifier of the data broadcasting service. The method of the invention can lead the front-end system to be easy to adjust and expand, and avoid influencing the preset parameters of the set-top box when modifying the data broadcasting service.

Description

Method for detecting data broadcast in transport stream
Technical Field
The invention belongs to the technical field of set top boxes, and particularly relates to a method for detecting data broadcast in a transport stream.
Background
DVB Project (Digital Video Broadcasting Project, digital video broadcasting organization) is an industry organization consisting of more than 300 members, which is initiated by a joint expert group consisting of the european telecommunication standardization organization, the european electronic standardization organization and the european broadcasting union. DVB (Digital Video Broadcasting ) is a series of internationally recognized digital television public standards maintained by DVB Project.
The satellite broadcasting network front end inserts NIT (Network Information Table ), BAT (Bouquet Association Table, service group association Table), PAT (Program Association Table ), PMT (Program Map Table, program map Table), SDT (Service Description Table ), TDT (Time & Date Table) information in each transport stream.
NIT is partitioned into one or more sub-tables of network information. The network identifier network_id is a reference number in the network information sub-table for identifying the transmission system of the NIT notification from any other transmission system. The BAT is partitioned into one or more traffic group association sub-tables. The service group identifier bouquet _ id is a reference number in the service group association table for identifying the service group. For various decoders to function properly, a uniform allocation of network_id and bouquet_id is required. They are uniformly managed by the international standard organization digital video broadcasting organization and provide registration. The operator needs to register network_id and bouquet_id with the international standards organization DVB to identify service information belonging to the operator.
NIT gives information about the specific transport network identified by the network identifier network_id in the table, including network name, physical parameters, and list of services in the network, etc.
The BAT gives information about the service group identified by the service group identifier bouquet_id in the table, including the name of the service group, the list of services in the service group, etc.
With the development of digital broadcast television, satellite programs are increasing, and a plurality of program operators exist on the satellite, and different operators insert various service information in a transport stream, including a data broadcast service. The carrier data broadcasting service is usually specified by presetting the transmission stream frequency point parameter and the PID in the set top box, and the method only uses the frequency point parameter and the PID to acquire the specified data broadcasting service, so that the risk of data acquisition errors exists in a complex environment, and the data broadcasting service is in error. On the other hand, the method is inconvenient to adjust and expand, and if an operator needs to adjust the data broadcasting service to another PID, the sold set top box needs to be updated, so that the cost is huge and problems easily occur.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides a method for detecting data broadcasting in a transport stream, so that the broadcasting front end is easy to adjust and expand the data broadcasting service, meanwhile, the accuracy and the effectiveness of detecting the data broadcasting service are ensured, and the problem that the data broadcasting service detection in the prior art is inaccurate is solved.
The method specifically comprises the following steps:
the satellite broadcasting network front end inserts the following information in the transport stream:
(1) Inserting a network information sub-table identified by a network identifier of a designated operator into a network information table, wherein the network information sub-table carries related information of a transmission network used by the operator and is used for distinguishing other transmission networks;
(2) Inserting a business group association sub-table identified by a business group identifier of a designated operator into the business group association table; the business group association sub-table carries a link descriptor, private data carried by the link descriptor with the link type of 0x6 is defined as a component tag, and the link descriptor defines the association relationship between a business identifier and the component tag for identifying one component stream, wherein the business identifier has the same value as a corresponding program number;
(3) Inserting a corresponding relation between the program number and the program mapping packet identifier in the program association table, and corresponding the service identifier to the program mapping packet identifier one by one;
(4) Three descriptors are inserted in the component description of the program map table:
a data broadcast identifier descriptor for indicating the type of the data component, wherein the data broadcast identifier is carried in the data broadcast identifier and is used for indicating the specification of the data broadcast in the broadcast network;
a flow identifier descriptor for distinguishing and identifying each component flow in a service, wherein a component tag carried by the flow identifier is used for identifying the component flow associated with the component descriptor;
the carousel identifier descriptor is used for establishing association with a bearing data broadcasting service;
and establishing association of the component tag and the transmission stream packet identification carrying the data broadcasting service through three descriptors.
Presetting frequency point information, a network identifier and a service group identifier of a designated operator in a set top box; the front end of the satellite broadcasting network broadcasts a transmission stream with the insertion information, the set top box filters and analyzes the transmission stream through the frequency point information, the network identifier and the service group identifier, judges whether a data broadcasting service provided by a designated operator exists in the transmission stream, and acquires a transmission stream packet identifier of the data broadcasting service if the data broadcasting service exists; the specific flow is as follows:
the set top box locks a transmission frequency point by using preset frequency point information;
step (2), the set top box filters and acquires a designated operator network information sub-table of a network information table in the transmission stream through a preset network identifier; if there is a sub-table of network information with a specified operator network identifier, performing step (3); otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (3), the set top box filters and acquires a designated operator service group association sub-table in a service group association table in the transmission stream through a preset service group identifier; if there is a service group association sub-table with a specified operator service group identifier, executing step (4); otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (4), the set top box analyzes the link descriptor carried by the business group association sub-table with the business group identifier of the appointed operator, if the analyzed link type is 0x6 link descriptor, the values and the corresponding relation of the business identifier and the component label are recorded, and the step (5) is executed; otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (5), the set top box filters and analyzes the program association table, and obtains the corresponding program mapping packet identification through the service identification;
step (6), the set top box filters and analyzes the program mapping table through the program mapping packet identification to obtain a data broadcast identification descriptor, a stream identification descriptor and a carousel identification descriptor;
and acquiring the transmission stream packet identification carrying the data broadcasting service through the component tag, namely detecting the data broadcasting in the current transmission stream.
The technical key points of the method mainly comprise:
1. the front end of the satellite broadcasting network inserts a network information sub-table carrying a network identifier network_id of a specified operator and a service group association sub-table carrying a bouquet_id of the specified operator into a transport stream, and is used for indicating that the transport stream has data broadcasting services provided by the specified operator. A private field is defined in a link descriptor of the service group association table BAT, and a service identifier service_id carrying the data broadcast service is associated with a component tag component_tag. The program association table PAT and the program mapping table PMT are inserted with data and descriptors to complete the association of the component label component_tag and the transport stream packet identification PID carrying the data broadcasting service.
2. The set top box respectively filters the network information table NIT and the service group association table BAT by using a preset network_id and a preset bouquet_id, and analyzes and judges whether the data broadcasting service of the appointed operator exists in the current transmission stream. And filtering and analyzing other data to obtain a transport stream packet identification PID carrying the data broadcasting service, thereby completing the detection of the data broadcasting service.
3. The identification of the data broadcasting service is completed by inserting a plurality of groups of information into the front end, so that the purpose of accurately detecting the data broadcasting service is achieved. Meanwhile, the front-end system can be easy to adjust and expand the data broadcasting service, and the influence on the preset parameters of the set top box when the front-end system modifies the data broadcasting service is avoided.
The method of the invention inserts a network information sub-table carrying a network_id of a designated operator and a service group association sub-table carrying a bouquet_id of the designated operator into a transport stream at the front end of a satellite broadcast network, and is used for indicating that the transport stream has data broadcast service provided by the designated operator. Defining a private field in a link descriptor of a service group association table BAT, and associating a service identifier service_id carrying a data broadcasting service with a component tag component_tag; meanwhile, data and descriptors are inserted into a program association table PAT and a program mapping table PMT, and association of a component label component_tag and a transport stream packet identification PID carrying a data broadcasting service is completed. The set top box respectively filters the network information table NIT and the service group association table BAT by using a preset network_id and a preset bouquet_id, and analyzes and judges whether the data broadcasting service of the appointed operator exists in the current transmission stream. And filtering and analyzing other data to obtain a transport stream packet identification PID carrying the data broadcasting service, thereby completing the detection of the data broadcasting service.
The invention completes the identification of the data broadcasting service by inserting a plurality of groups of information into the front end, thereby achieving the purpose of accurately detecting the data broadcasting service. Meanwhile, the defect that the PID is required to be preset in the set top box, the set top box software upgrading caused by the adjustment of the data broadcasting service of an operator is avoided, and various problems caused in the upgrading process are avoided. The invention makes the PID of the data broadcasting service transmission flow packet be analyzed and obtained from the transmission flow, not preset on the set top box, can make the front end system easy to adjust and expand the data broadcasting service, and avoids the influence on the preset parameters of the set top box when the front end system modifies the data broadcasting service.
Drawings
FIG. 1 is a schematic diagram of the front-end insertion information of a satellite broadcast network according to the present invention;
fig. 2 is a flow chart of a set top box detection data broadcasting service in the method of the present invention.
Detailed Description
As shown in fig. 1, the front end of the satellite broadcasting network inserts the following information into the transport stream:
(1) Inserting a network information sub-table identified by a network identifier network_id of a designated operator into a network information table NIT, wherein the network information sub-table carries related information of a transmission network used by the operator and is used for distinguishing other transmission networks;
(2) Inserting a service group association sub-table identified by a service group identifier bouquet_id of a designated operator into a service group association table BAT; the service group association sub-table carries a link descriptor link_descriptor, private data carried by the link descriptor with the link type of 0x6 is defined as a component tag component_tag, and the link descriptor defines an association relationship between a service identifier service_id and the component tag component_tag for identifying a component stream, wherein the service identifier service_id has the same value as a corresponding program number program_number;
(3) Inserting a corresponding relation between a program number program_number and a program map_PID in a program association table PAT, and corresponding a service identifier service_id and the program map_PID one by one;
(4) Three descriptors are inserted in the component description of the program map table PMT:
a data broadcast identifier data_broadcast_id_descriptor, which indicates the type of the data component, wherein the carried data broadcast identifier data_broadcast_id is used for indicating the specification of the data broadcast in the broadcast network;
a stream identifier descriptor stream_identifier_descriptor, which is used for distinguishing and identifying each component stream in a service, wherein a component tag component_tag carried in the stream identifier is used for identifying the component stream related to the component descriptor;
the carousel identifier descriptor is a carousel identifier descriptor, and is used for establishing association with a bearing data broadcasting service;
through three descriptors, the association of the component tag component_tag and the transport stream packet identification PID carrying the data broadcast service is established.
Presetting frequency point information of a designated operator, a network identifier network_id and a service group identifier bouquet_id in a set top box; the front end of the satellite broadcasting network broadcasts a transport stream with the insertion information, the set top box filters and analyzes the transport stream through the frequency point information, the network identifier network_id and the service group identifier bouquet_id, judges whether a data broadcasting service provided by a designated operator exists in the transport stream, and acquires a transport stream packet identifier PID of the data broadcasting service if the data broadcasting service exists.
The specific flow is shown in fig. 2:
the set top box locks a transmission frequency point by using preset frequency point information;
step (2), the set top box filters and acquires a designated operator network information sub-table of a network information table NIT in the transmission stream through a preset network identifier network_id; if there is a sub-table of network information with a specified operator network identifier network_id, performing step (3); otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (3), the set top box filters and acquires a designated operator service group association sub-table in a service group association table BAT in the transmission stream through a preset service group identifier bouquet_id; if there is a service group association sub-table with a specified operator service group identifier bouquet_id, executing step (4); otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (4), the set top box analyzes a link descriptor linkage_descriptor carried by a service group association sub-table with a service group identifier bouquet_id of a designated operator, if the analyzed link type is 0x6 link descriptor, the values and the corresponding relation of a service identifier service_id and a component tag component_tag are recorded, and step (5) is executed; otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (5), the set top box filters and analyzes the program association table PAT, and obtains the corresponding program map packet identification program_map_PID through the service identification service_id;
step (6), the set top box filters and analyzes a program mapping table PMT through a program mapping packet identification program_map_PID to obtain a data broadcast identification descriptor, a stream identification descriptor and a carousel identification descriptor;
and acquiring a transport stream packet identifier PID carrying the data broadcasting service through the component tag component_tag, namely detecting the data broadcasting in the current transport stream.

Claims (1)

1. The method for detecting the data broadcast in the transport stream is characterized in that the front end of the satellite broadcast network inserts the following information into the transport stream:
(1) Inserting a network information sub-table identified by a network identifier of a designated operator into a network information table, wherein the network information sub-table carries related information of a transmission network used by the operator and is used for distinguishing other transmission networks;
(2) Inserting a business group association sub-table identified by a business group identifier of a designated operator into the business group association table; the business group association sub-table carries a link descriptor, private data carried by the link descriptor with the link type of 0x6 is defined as a component tag, and the link descriptor defines the association relationship between a business identifier and the component tag for identifying one component stream, wherein the business identifier has the same value as a corresponding program number;
(3) Inserting a corresponding relation between the program number and the program mapping packet identifier in the program association table, and corresponding the service identifier to the program mapping packet identifier one by one;
(4) Three descriptors are inserted in the component description of the program map table:
a data broadcast identifier descriptor for indicating the type of the data component, wherein the data broadcast identifier is carried in the data broadcast identifier and is used for indicating the specification of the data broadcast in the broadcast network;
a flow identifier descriptor for distinguishing and identifying each component flow in a service, wherein a component tag carried by the flow identifier is used for identifying the component flow associated with the component descriptor;
the carousel identifier descriptor is used for establishing association with a bearing data broadcasting service;
establishing association between a component tag and a transport stream packet identifier carrying a data broadcast service through three descriptors;
presetting frequency point information, a network identifier and a service group identifier of a designated operator in a set top box; the front end of the satellite broadcasting network broadcasts a transmission stream with the insertion information, the set top box filters and analyzes the transmission stream through the frequency point information, the network identifier and the service group identifier, judges whether a data broadcasting service provided by a designated operator exists in the transmission stream, and acquires a transmission stream packet identifier of the data broadcasting service if the data broadcasting service exists; the specific flow is as follows:
the set top box locks a transmission frequency point by using preset frequency point information;
step (2), the set top box filters and acquires a designated operator network information sub-table of a network information table in the transmission stream through a preset network identifier; if there is a sub-table of network information with a specified operator network identifier, performing step (3); otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (3), the set top box filters and acquires a designated operator service group association sub-table in a service group association table in the transmission stream through a preset service group identifier; if there is a service group association sub-table with a specified operator service group identifier, executing step (4); otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (4), the set top box analyzes the link descriptor carried by the business group association sub-table with the business group identifier of the appointed operator, if the analyzed link type is 0x6 link descriptor, the values and the corresponding relation of the business identifier and the component label are recorded, and the step (5) is executed; otherwise, the current frequency point is considered to have no data broadcasting service of the appointed operator, and the process is exited;
step (5), the set top box filters and analyzes the program association table, and obtains the corresponding program mapping packet identification through the service identification;
step (6), the set top box filters and analyzes the program mapping table through the program mapping packet identification to obtain a data broadcast identification descriptor, a stream identification descriptor and a carousel identification descriptor;
and acquiring the transmission stream packet identification carrying the data broadcasting service through the component tag, namely detecting the data broadcasting in the current transmission stream.
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