CN111131840B - Method and device for switching network of video service system - Google Patents

Abstract

The embodiment of the invention provides a method and a device for switching networks of a video service system, wherein the video service system comprises a streaming media server and an Internet terminal with a cache database, and the method comprises the following steps: the internet terminal detects a current data network and determines a standby data network according to the current data network; the internet terminal acquires video data from the streaming media server by adopting the current data network, and stores the video data into the cache database; when the Internet terminal performs video service, counting the stock of video data in the cache database; and when the stock of the video data is smaller than a preset threshold value, the internet terminal judges whether a standby data network is available, and if the standby data network is judged to be available, the current data network is switched to the standby data network. Therefore, the network is switched before the user can perceive the disconnection of the network, and the user is prevented from perceiving video cartoon.

Description

Method and device for switching network in video service system

technical field

The invention relates to the technical field of video services, in particular to a method for switching networks in a video service system and a device for switching networks in a video service system.

Background technique

The Internet of Vision adopts VisionVera real-time high-definition video exchange technology to realize the real-time transmission of high-definition video in the whole network that cannot be realized by the Internet at present, and integrate high-definition video conferencing, video monitoring, remote training, intelligent monitoring and analysis, emergency command, video phone, live broadcast, TV Dozens of video, voice, picture, text, communication, data and other services such as mail and information release are all integrated into one system platform, and real-time interconnection of high-definition quality video communication is realized through a variety of terminal devices.

When the Internet of View is used for video services, for example, a mobile phone is used for video telephony, video conferencing, and monitoring resources in the Internet of View. A network switch will occur. However, due to the current network speed detection function provided by mobile phones, it will cause delays, that is to say, when the mobile phone finds that the network connection is not smooth and then switches the external network access source, the user will still feel that the network is disconnected, and the experience is still very bad. Moreover, when the network is found to be unsmooth and the access source of the external network is to be switched, the backup network may not be able to meet the speed requirements after switching to the backup network, and the effect of switching the access source of the external network may not be as good as that of keeping it as it is.

Contents of the invention

In view of the above problems, embodiments of the present invention are proposed to provide a method for switching networks of a video service system that overcomes the above problems or at least partially solves the above problems, and a corresponding device for switching networks of a video service system.

In the first aspect, the embodiment of the present invention discloses a method for switching networks in a video service system, the video service system includes a streaming media server and an Internet terminal with a cache database, and the method includes:

The Internet terminal detects the current data network, and determines the backup data network according to the current data network;

The Internet terminal obtains video data from the streaming media server by using the current data network, and stores the video data in the cache database;

When the Internet terminal is performing video services, counting the stock of video data in the cache database;

When the stock of the video data is less than a preset threshold, the Internet terminal judges whether the backup data network is available, and switches the current data network to the backup data network if it determines that the backup data network is available.

Optionally, the video service system further includes a video networking server, the video networking server is used to transmit video data to the streaming media server using the video networking, and the preset threshold is determined in the following manner:

The Internet terminal acquires the number of video data transmitted by the Internet-of-Vision server per second;

The Internet terminal multiplies the quantity of video data transmitted per second by a first preset value to obtain the preset threshold.

Optionally, also include:

The Internet terminal multiplies the number of video data transmitted per second by a second preset value to obtain a first value;

The Internet terminal determines the first value as the total amount of cached data in the cache database.

Optionally, the Internet terminal judging whether the backup data network is available includes:

The Internet terminal switches the current data network to a backup data network;

The Internet terminal uses the backup data network to send a test request to a designated server;

If the Internet terminal receives a response message from the designated server to the test request, it determines that the standby data network is available, and switches the standby data network to the current data network.

Optionally, the test request is an HTTP request.

In the second aspect, the embodiment of the present invention also discloses a network switching device for a video service system. The video service system includes a streaming media server and an Internet terminal with a cache database, and the Internet terminal includes:

A network determination module, configured to detect a current data network, and determine a backup data network according to the current data network;

A data acquisition module, configured to acquire video data from the streaming media server using the current data network, and store the video data in the cache database;

An inventory statistics module, configured to count the inventory of video data in the cache database when performing video services;

The network switching module is used to determine whether the backup data network is available when the stock of the video data is less than a preset threshold, and switch the current data network to the backup data network if it is determined that the backup data network is available.

Optionally, the video service system further includes a video networking server, the video networking server is used to transmit video data to the streaming media server using the video networking, and the preset threshold is determined by the following modules:

Quantity acquisition module, used to acquire the quantity of video data transmitted by the Internet of View server per second;

A preset threshold calculation module, configured to multiply the number of video data transmitted per second by a first preset value to obtain the preset threshold.

Optionally, also include:

A first value calculation module, configured to multiply the number of video data transmitted per second by a second preset value to obtain a first value;

A total amount determining module, configured to determine the first value as the total amount of cached data in the cache database.

Optionally, the network switching module includes:

A network switching submodule, configured to switch the current data network to a standby data network;

A test request sending submodule, configured to send a test request to a designated server using the standby data network;

The judging submodule is configured to judge that the backup data network is available and switch the backup data network to the current data network if a response message from the specified server to the test request is received.

Optionally, the test request is an HTTP request.

In the third aspect, the embodiment of the present invention also discloses an electronic device, including:

one or more processors; and

One or more machine-readable media with instructions stored thereon, when executed by the one or more processors, make the electronic device execute the steps of one or more methods as described in the embodiments of the present invention .

In a fourth aspect, the embodiment of the present invention also discloses a computer-readable storage medium, which stores a computer program to enable a processor to execute the steps of the method described in the embodiment of the present invention.

Embodiments of the present invention include the following advantages:

In the embodiment of the present invention, by adopting the cache database to cache the video data, and setting a preset preset (alarm line) of the cache data margin, when the cache data margin is less, the network is switched, so that the user can perceive Switch the network before the network is disconnected, so as to avoid the user's perception of video freeze. In addition, by detecting whether the backup data network is available before switching the network, it is avoided that the backup data network cannot meet the speed requirement, and the effect of switching the external network access source is not as good as keeping it as it is.

Description of drawings

FIG. 1 is a flow chart of steps of a method embodiment of a video service system switching network according to an embodiment of the present invention;

FIG. 2 is a structural block diagram of an embodiment of a device for switching a network in a video service system according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of networking of a video network according to the present invention;

Fig. 4 is a schematic diagram of the hardware structure of a node server of the present invention;

Fig. 5 is a schematic diagram of the hardware structure of an access switch of the present invention;

Fig. 6 is a schematic diagram of the hardware structure of an Ethernet protocol conversion gateway of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to Fig. 1, it shows a flow chart of the steps of a method embodiment of a video service system switching network according to an embodiment of the present invention. The video service system includes a streaming media server and an Internet terminal with a cache database, and may specifically include the following steps :

Step S101, the Internet terminal detects the current data network, and determines a backup data network according to the current data network;

Internet terminals may include various mobile devices, such as mobile phones, tablet computers, game consoles, PDAs, and the like. The operating system of the mobile terminal can include Android (Android), IOS, Windows Phone, Windows, etc., and can usually support the operation of various video applications. Program), used to perform video services such as video telephony, video conferencing, and monitoring and broadcasting monitoring resources in the video network with the video network terminal.

The current data network may be an external network access source currently being used on the Internet terminal, and is used to obtain video data transmitted by other terminals or servers, and the standby data network may be a backup external network access source on the Internet terminal.

In the embodiment of the present invention, the Internet terminal can detect the current data network, and determine the standby data network according to the current data network. For example, when the current data network on the Internet terminal is WiFi, it may be determined that the standby data network is mobile data traffic.

Step S102, the Internet terminal obtains video data from the streaming media server by using the current data network, and stores the video data in the cache database;

The Internet terminal may have a cache database for caching video data, for example, the cache database is MySQL, SQLServer and Oracle.

The streaming media server may be a server in the Internet of Vision, which is used to convert the video data based on the Internet of Vision protocol in the Internet of Vision into video data based on the Internet Protocol, so that Internet terminals can receive these Internet Protocol-based video data in the Internet.

Usually, the current data network used by Internet terminals is an Internet Protocol network. After protocol conversion is performed on the video data in the video network through the streaming media server, the Internet terminal can use the current data network to obtain video data from the streaming media server.

In the embodiment of the present invention, in order to avoid real-time transmission of video data to the Internet terminal for playback, the video data may first be stored in the cache database of the Internet terminal, and then the Internet terminal obtains the video data from the cache database for playback.

Step S103, when the Internet terminal is performing video services, counting the stock of video data in the cache database;

In the embodiment of the present invention, in order to avoid the inability to sense and switch the network in time when the current data network is disconnected, the Internet terminal can count the stock of video data in the cache database in real time when performing video services, so as to Real-time perception of the current data network status.

Specifically, the video data in the cache database may have an inventory characteristic parameter, which is used to indicate the inventory of the video data. When performing video services, each time the video data is stored in the cache database, and each time the video data is stored from the cache The video data is retrieved from the database for playback, and the stock feature parameters are adjusted accordingly according to the amount of stored video data and the amount of retrieved video data. As an example, if the stock feature parameter is stock, and the video data in the cache database is 100 frames, then the statistics stock=100, and if 10 frames of video data are taken out from the cache database to play, then the statistics stock=90.

Step S104, when the stock of the video data is less than a preset threshold, the Internet terminal judges whether a backup data network is available, and if it determines that the backup data network is available, switches the current data network to a backup data network.

Wherein, the preset threshold may be a preset minimum stock threshold, which is used to indicate the minimum stock of video data in the cache database, for example, the preset threshold may be 10 frames.

The Internet terminal can judge whether the stock of video data is less than the preset threshold. When the stock of video data is less than the preset threshold, it is considered that the current data network is faulty. The effect of entering the source is not as good as keeping it as it is. Before switching the network, the process of judging whether the backup data network is available can be carried out.

In the embodiment of the present invention, if it is determined that the standby data network is available, the current data network is switched to the standby data network. After the current data network is switched to the standby data network, the Internet terminal can use the standby data network from the streaming media server. Obtain video data, and store the video data in the cache database. If it is determined that the standby data network is unavailable, the process of switching the current data network to the standby data network may not be performed.

In a preferred embodiment of the present invention, the video service system further includes a video networking server, and the video networking server is used to transmit video data to the streaming media server by using video networking. The preset threshold is determined in the following way:

The Internet terminal acquires the number of video data transmitted per second by the Internet of View server; the Internet terminal multiplies the number of video data transmitted per second by a first preset value to obtain the preset threshold.

Wherein, the first preset value may be a preset value, and the value range of the first preset value may be between 0 and 1, for example, the first preset value is 0.4. The purpose of this setting is to ensure that the Internet terminal has enough time (0.4 seconds) to switch the network and re-buffer the data. The user experience is also consistent without causing the feeling of video freeze.

In the embodiment of the present invention, the Internet terminal may obtain the number of video data transmitted by the Internet of Things server per second, and multiply the number of video data transmitted per second by a first preset value, so as to obtain the preset threshold. As an example, assuming that the number of video data transmitted by the Internet of Things server is 25 frames per second, and the first preset value is 0.4, the preset threshold can be calculated to be 10 frames, that is, the value of the alarm line is 10 frames.

In a preferred embodiment of the present invention, described method also comprises the following steps:

The Internet terminal multiplies the number of video data transmitted per second by a second preset value to obtain a first value; the Internet terminal determines the first value as the total amount of cached data in the cache database.

Wherein, the second preset value may be a preset value.

In order to avoid a lot of video data stored in the cache database no longer needing to be played when the user cuts off the video service in some cases, resulting in waste of resources, you can set the total amount of cached data stored in the cache database. In the embodiment of the present invention, the Internet terminal may multiply the amount of video data transmitted per second by the second preset value to obtain the first value, and determine the first value as the total amount of cached data in the cache database.

In the specific implementation, according to the performance requirements of the product, the maximum call delay is 2 seconds. In order to leave sufficient video data margin, according to experience, the video data margin can be set to double the amount of data that guarantees a 2-second call. Therefore, The second preset value can be set to 4. As an example, assuming that the video data transmitted by the Internet of Things server is 25 frames per second, then according to the performance requirements of the product, the maximum call delay is 2 seconds, which is 50 frames. In order to leave sufficient data margin, according to experience, the remaining The amount of data should be twice the amount of data in a 2-second call, that is, 100 frames, that is, the total amount of cached data is 100 frames.

In the embodiment of the present invention, when the number of video data transmitted by the video network server per second is 25 frames, the first preset value is 0.4, and the second preset value is 4, the alarm line (preset threshold) can be calculated as 10 frames, the total margin (the total amount of cached data) is 100 frames, then the ratio of the alarm line data to the total margin data can be calculated as 10%.

In a preferred embodiment of the present invention, the step S104 may include the following sub-steps:

The Internet terminal switches the current data network to a backup data network; the Internet terminal uses the backup data network to send a test request to a designated server; if the Internet terminal receives the test request from the designated server response message, it is determined that the backup data network is available.

The designated server may be a pre-designated network server for testing whether the backup data network is available, for example, the designated server may be a streaming media server.

In the embodiment of the present invention, the current data network can be forcibly switched to the standby data network through the Internet terminal, and the standby data network is used to send a test request to the designated server, and if a response message from the designated server to the test request is received, it is determined The standby data network is available, and the standby data network is switched to the current data network.

Wherein, the test request may be an HTTP (HyperText Transfer Protocol, hypertext transfer protocol) request, and the HTTP request is a simple request based on the request-response protocol, which can be used to test whether the data network is available.

Specifically, you can set a time threshold for receiving a response message, such as 100 milliseconds, and judge whether the standby data network is available by judging whether a response message from the server is received within the time threshold, and if no response message is received beyond the time threshold , when it is determined that the standby data network is unavailable, switch the standby data network to the current data network; if a response message is received within the time threshold, determine that the standby data network is available, and switch the standby data network to the current data network .

In order to improve the accuracy of testing whether the standby data network is available, two test requests can be sent to the designated server. If the two test requests can receive a response message, and the time for receiving the two response messages does not exceed the time threshold, If it does not exceed 100 milliseconds, it is determined that the standby data network is available, and the standby data network is switched to the current data network.

In the embodiment of the present invention, by adopting the cache database to cache the video data, and setting a preset preset (alarm line) of the cache data margin, when the cache data margin is less, the network is switched, so that the user can perceive Switch the network before the network is disconnected, so as to avoid the user's perception of video freeze. In addition, by detecting whether the backup data network is available before switching the network, it is avoided that the backup data network cannot meet the speed requirement, and the effect of switching the external network access source is not as good as keeping it as it is.

It should be noted that, for the method embodiment, for the sake of simple description, it is expressed as a series of action combinations, but those skilled in the art should know that the embodiment of the present invention is not limited by the described action sequence, because According to the embodiment of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present invention.

Referring to FIG. 2 , it shows a structural block diagram of a device embodiment of a video service system switching network according to an embodiment of the present invention. The video service system includes a streaming media server and an Internet terminal with a cache database. The Internet terminal may include The following modules:

A network determination module 101, configured to detect a current data network, and determine a backup data network according to the current data network;

A data obtaining module 102, configured to use the current data network to obtain video data from the streaming media server, and store the video data in the cache database;

The inventory statistics module 103 is configured to count the inventory of video data in the cache database when performing video services;

The network switching module 104 is used for judging whether the backup data network is available when the stock of the video data is less than a preset threshold, and switching the current data network to the backup data network if it is determined that the backup data network is available.

Optionally, the video service system further includes a video networking server, the video networking server is used to transmit video data to the streaming media server using the video networking, and the preset threshold is determined by the following modules:

Quantity acquisition module, used to acquire the quantity of video data transmitted by the Internet of View server per second;

A preset threshold calculation module, configured to multiply the number of video data transmitted per second by a first preset value to obtain the preset threshold.

Optionally, the device may also include the following modules:

A first value calculation module, configured to multiply the number of video data transmitted per second by a second preset value to obtain a first value;

A total amount determining module, configured to determine the first value as the total amount of cached data in the cache database.

Optionally, the network switching module 104 may include the following submodules:

A network switching submodule, configured to switch the current data network to a standby data network;

A test request sending submodule, configured to send a test request to a designated server using the standby data network;

The judging submodule is configured to judge that the backup data network is available and switch the backup data network to the current data network if a response message from the specified server to the test request is received.

Optionally, the test request is an HTTP request.

As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment.

The embodiment of the present invention also provides an electronic device, including:

one or more processors; and

One or more machine-readable media with instructions stored thereon, when executed by the one or more processors, make the electronic device execute the steps of one or more methods as described in the embodiments of the present invention .

The embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program to enable a processor to execute the steps of the method described in the embodiment of the present invention.

The Internet of Vision is an important milestone in the development of the network. It is a real-time network that can realize real-time transmission of high-definition video, and push many Internet applications to high-definition video, high-definition face-to-face.

The Internet of View adopts real-time high-definition video exchange technology, which can provide required services on one network platform, such as high-definition video conferencing, video surveillance, intelligent monitoring and analysis, emergency command, digital broadcast TV, time-lapse TV, online teaching, live broadcast , VOD on demand, TV mail, personalized recording (PVR), intranet (self-managed) channel, intelligent video broadcast control, information release and other dozens of video, voice, picture, text, communication, data and other services are all integrated in one System platform, realize high-definition quality video playback through TV or computer.

In order to enable those skilled in the art to better understand the embodiments of the present invention, the Internet of Things is introduced as follows:

Some of the technologies applied in the Internet of Things are as follows:

Network Technology

The network technology innovation of the Internet of View has improved the traditional Ethernet (Ethernet) to face the potentially huge first video traffic on the network. Different from pure network packet switching (Packet Switching) or network circuit switching (Circuit Switching), video networking technology uses Packet Switching to meet Streaming requirements. The Internet of Vision technology has the flexibility, simplicity and low price of packet switching, and at the same time has the quality and security guarantee of circuit switching, realizing the seamless connection of switched virtual circuits and data formats throughout the network.

Switching Technology

Video networking adopts the two advantages of Ethernet asynchronous and packet switching, eliminates the defects of Ethernet under the premise of full compatibility, has end-to-end seamless connection of the whole network, directly connects to user terminals, and directly carries IP data packets. User data does not require any format conversion within the entire network. Video networking is a more advanced form of Ethernet. It is a real-time switching platform, which can realize the real-time transmission of large-scale high-definition video in the whole network that cannot be realized by the Internet at present, and push many network video applications to high-definition and unification.

Server Technology

The server technology on the Internet of View and unified video platform is different from the server in the traditional sense. Its streaming media transmission is based on connection-oriented, and its data processing capability has nothing to do with traffic and communication time. A single network layer can contain information command and data transmission. For voice and video services, the complexity of video streaming and unified video platform streaming media processing is much simpler than data processing, and the efficiency is greatly improved by more than 100 times compared with traditional servers.

Storage Technology

The ultra-high-speed storage technology of the unified video platform adopts the most advanced real-time operating system in order to adapt to the super-large capacity and super-large-flow media content, and maps the program information in the server command to the specific hard disk space, and the media content no longer passes through the server. It is delivered directly to the user terminal in an instant, and the user generally waits for less than 0.2 seconds. The optimized sector distribution greatly reduces the mechanical movement of the hard disk head seeking. The resource consumption is only 20% of that of IP Internet at the same level, but the concurrent traffic generated is 3 times larger than that of the traditional hard disk array, and the overall efficiency is increased by more than 10 times.

Network Security Technology

The structural design of the Internet of View completely eradicates the network security problems that plague the Internet through the individual licensing system for each service, complete isolation of equipment and user data, and generally does not require anti-virus programs and firewalls, preventing hackers and virus attacks , to provide users with a structured worry-free security network.

Service Innovation Technology

The unified video platform integrates business and transmission together, whether it is a single user, a private network user or the sum of a network, it is just an automatic connection. User terminals, set-top boxes or PCs are directly connected to the unified video platform to obtain rich and colorful multimedia video services in various forms. The unified video platform adopts the "recipe-style" table matching mode to replace the traditional complex application programming. It can realize complex applications with very little code and realize "unlimited" new business innovations.

The networking of the Internet of Things is as follows:

Vision networking is a network structure with centralized control. The network can be a tree network, star network, ring network, etc., but on this basis, a centralized control node is required in the network to control the entire network.

As shown in Figure 3, the Internet of Things is divided into two parts: the access network and the metropolitan area network.

The equipment in the access network can be mainly divided into three categories: node servers, access switches, and terminals (including various set-top boxes, encoding boards, memory, etc.). The node server is connected with the access switch, and the access switch can be connected with multiple terminals and can be connected with Ethernet.

Wherein, the node server is a node with centralized control function in the access network, which can control the access switches and terminals. The node server can be directly connected to the access switch, and can also be directly connected to the terminal.

Similarly, the devices in the MAN part can also be divided into three categories: MAN servers, node switches, and node servers. The metro server is connected to the node switch, and the node switch can be connected to multiple node servers.

Wherein, the node server is the node server of the access network part, that is, the node server belongs to both the access network part and the metropolitan area network part.

The metropolitan area server is a node with a centralized control function in the metropolitan area network, which can control node switches and node servers. The metro server can be directly connected to the node switch, or directly connected to the node server.

It can be seen that the entire Vision Network is a layered centralized control network structure, while the network controlled by the node server and the metro server can be in various structures such as tree, star, and ring.

Vividly speaking, the access network part can form a unified video platform (the part in the dotted circle), and multiple unified video platforms can form a video network; each unified video platform can be interconnected through the metropolitan area and the wide area video network.

Classification of Internet of Things devices

1.1 The equipment in the video network of the embodiment of the present invention can be mainly divided into three categories: servers, switches (including Ethernet protocol conversion gateways), terminals (including various set-top boxes, encoding boards, memory, etc.). As a whole, the Internet of Things can be divided into a metropolitan area network (or a national network, a global network, etc.) and an access network.

1.2 The equipment in the access network can be mainly divided into three categories: node server, access switch (including Ethernet protocol conversion gateway), terminal (including various set-top boxes, encoding boards, storage, etc.).

The specific hardware structure of each access network device is as follows:

Node server:

As shown in Figure 4, it mainly includes a network interface module 201, a switching engine module 202, a CPU module 203, and a disk array module 204;

Wherein, network interface module 201, the bag that CPU module 203, disk array module 204 come in all enters switching engine module 202; The guide information of packet stores this packet into the queue of corresponding packet buffer 206; If the queue of packet buffer 206 is close to full, then discards; Switching engine module 202 polls all packet buffer queues, and forwards if the following conditions are met: 1) The sending buffer of the port is not full; 2) The queue packet counter is greater than zero. Disk array module 204 mainly realizes the control to hard disk, comprises operations such as the initialization of hard disk, read and write; (including downlink protocol packet address table, uplink protocol packet address table, and data packet address table), and configuration of the disk array module 204 .

Access switch:

As shown in Figure 5, mainly include network interface module (downlink network interface module 301, uplink network interface module 302), switching engine module 303 and CPU module 304;

Wherein, the packet (upstream data) that the downstream network interface module 301 comes in enters the packet detection module 305; Whether the destination address (DA), source address (SA), data packet type and packet length of the packet detection module 305 detection packet meet the requirements, if Meet, then distribute corresponding flow identifier (stream-id), and enter switching engine module 303, otherwise discard; The packet (downstream data) that upstream network interface module 302 comes in enters switching engine module 303; The data packet that CPU module 304 comes in Enter switching engine module 303; Switching engine module 303 carries out the operation of looking into address table 306 to the bag that comes in, thereby obtains the guiding information of packet; If the bag that enters switching engine module 303 is that downlink network interface goes to uplink network interface, then combines Flow identifier (stream-id) stores this packet into the queue of corresponding packet cache 307; If the queue of this packet cache 307 is close to full, then discards; If the packet that enters switching engine module 303 is not downlink network interface, goes up If the data packet is sent to the network interface, the data packet is stored in the queue of the corresponding packet buffer 307 according to the direction information of the packet; if the queue of the packet buffer 307 is nearly full, it is discarded.

The switching engine module 303 polls all packet buffer queues, which can include two situations:

If the queue goes from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the port sending buffer is not full; 2) the queue packet counter is greater than zero; 3) the token generated by the code rate control module is obtained ;

If the queue does not go from the downlink network interface to the uplink network interface, the following conditions are met for forwarding: 1) the sending buffer of the port is not full; 2) the packet counter of the queue is greater than zero.

The code rate control module 308 is configured by the CPU module 304 to generate tokens for all packet buffer queues going from the downlink network interface to the uplink network interface within a programmable interval to control the uplink forwarding code rate.

The CPU module 304 is mainly responsible for protocol processing with the node server, configuration of the address table 306 , and configuration of the code rate control module 308 .

Ethernet protocol conversion gateway :

As shown in Figure 6, it mainly includes network interface modules (downlink network interface module 401, uplink network interface module 402), switching engine module 403, CPU module 404, packet detection module 405, code rate control module 408, address table 406, packet Buffer 407 and MAC adding module 409 , MAC deleting module 410 .

Wherein, the data packet coming in from the downlink network interface module 401 enters the packet detection module 405; the packet detection module 405 detects the Ethernet MAC DA, Ethernet MAC SA, Ethernet length or frame type, visual networking destination address DA, visual networking Source address SA, depending on whether the network data packet type and packet length meet the requirements, if so, assign the corresponding stream identifier (stream-id); then, subtract MAC DA, MAC SA, length or frame type by the MAC deletion module 410 (2byte), and enter the corresponding receiving buffer, otherwise discard;

The downlink network interface module 401 detects the sending buffer of the port, if there is a packet, the Ethernet MAC DA of the corresponding terminal is known according to the visual network destination address DA of the packet, and the Ethernet MAC DA of the terminal, the MACSA of the Ethernet protocol conversion gateway, and the MACSA of the Ethernet protocol conversion gateway are added. Ethernet length or frame type, and send.

The functions of other modules in the Ethernet protocol conversion gateway are similar to those of the access switch.

terminal:

It mainly includes a network interface module, a business processing module and a CPU module; for example, a set-top box mainly includes a network interface module, an video and audio codec engine module, and a CPU module; an encoding board mainly includes a network interface module, an video and audio encoding engine module, and a CPU module; It mainly includes network interface module, CPU module and disk array module.

1.3 The equipment of the metropolitan area network can be mainly divided into two categories: node server, node switch, and metropolitan area server. Among them, the node switch mainly includes a network interface module, a switching engine module and a CPU module; the metro server mainly includes a network interface module, a switching engine module and a CPU module.

2. Definition of Internet of Vision data package

2.1 Definition of Access Network Packet

The data packet of the access network mainly includes the following parts: destination address (DA), source address (SA), reserved bytes, payload (PDU), and CRC.

As shown in the table below, the data packets of the access network mainly include the following parts:

DA SA Reserved Payload CRC

in:

The destination address (DA) consists of 8 bytes (byte), the first byte indicates the type of data packet (such as various protocol packets, multicast data packets, unicast data packets, etc.), there are up to 256 possibilities, The second byte to the sixth byte is the address of the metropolitan area network, and the seventh and eighth bytes are the address of the access network;

The source address (SA) is also composed of 8 bytes (byte), and the definition is the same as that of the destination address (DA);

Reserved bytes consist of 2 bytes;

The payload part has different lengths according to different datagram types. If it is a variety of protocol packets, it is 64 bytes. If it is a single multicast data packet, it is 32+1024=1056 bytes. Of course, it is not limited to Above 2 types;

CRC consists of 4 bytes, and its calculation method follows the standard Ethernet CRC algorithm.

2.2 MAN packet definition

The topology of the metropolitan area network is a graph. There may be two or even more than two types of connections between two devices, that is, there may be more than 2 connections between node switches and node servers, node switches and node switches, and node switches and node servers. kind of connection. However, the MAN address of the MAN device is unique. In order to accurately describe the connection relationship between MAN devices, a parameter: label is introduced in the embodiment of the present invention to uniquely describe a MAN device.

The definition of labels in this manual is similar to the definition of labels in MPLS (Multi-Protocol Label Switch, Multi-Protocol Label Switching). Assuming that there are two connections between device A and device B, then the data packets from device A to device B have 2 labels, the packet from device B to device A also has 2 labels. The label is divided into an incoming label and an outgoing label. Assuming that the label (incoming label) of the data packet entering device A is 0x0000, the label (outgoing label) of the data packet when it leaves device A may become 0x0001. The network access process of the metropolitan area network is a network access process under centralized control, which means that the address allocation and label allocation of the metropolitan area network are all dominated by the metropolitan area server, and the node switches and node servers are all passively executed. Different from MPLS label allocation, MPLS label allocation is the result of mutual negotiation between switches and servers.

As shown in the table below, the data packet of the MAN mainly includes the following parts:

DA SA Reserved Label Payload CRC

That is, destination address (DA), source address (SA), reserved byte (Reserved), label, payload (PDU), and CRC. Among them, the format of the label can refer to the following definition: the label is 32bit, of which the high 16bit is reserved, and only the low 16bit is used, and its position is between the reserved byte of the data packet and the payload.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, devices, or computer program products. Accordingly, embodiments of the invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowcharts and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor or processor of other programmable data processing terminal equipment to produce a machine such that instructions executed by the computer or processor of other programmable data processing terminal equipment Produce means for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the The instruction means implements the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded into a computer or other programmable data processing terminal equipment, so that a series of operational steps are performed on the computer or other programmable terminal equipment to produce computer-implemented processing, thereby The instructions executed above provide steps for implementing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

Having described preferred embodiments of embodiments of the present invention, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be interpreted to cover the preferred embodiment and all changes and modifications which fall within the scope of the embodiments of the present invention.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or terminal equipment comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements identified, or also include elements inherent in such a process, method, article, or terminal equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

A method for switching networks in a video service system and a device for switching networks in a video service system provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principles and implementation methods of the present invention. The above implementation The description of the example is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary As stated above, the content of this specification should not be construed as limiting the present invention.

Claims (6)

1. A method for switching networks in a video service system, wherein the video service system comprises a streaming server and an internet terminal having a cache database, the method comprising:

the internet terminal detects a current data network and determines a standby data network according to the current data network;

the internet terminal acquires video data from the streaming media server by adopting the current data network, and stores the video data into the cache database, wherein the cache database is used for setting the total amount of cache data;

When the Internet terminal performs video service, counting the stock of video data in the cache database;

the internet terminal judges whether a standby data network is available or not when the stock of the video data is smaller than a preset threshold value, and if the standby data network is judged to be available, the current data network is switched to the standby data network;

the video service system further comprises a video networking server, wherein the video networking server is used for transmitting video data to the streaming media server by adopting video networking, and the preset threshold value is determined by the following modes:

the internet terminal obtains the number of video data transmitted by the video networking server per second;

the internet terminal multiplies the number of video data transmitted per second by a first preset value to obtain the preset threshold;

further comprises:

the internet terminal multiplies the number of video data transmitted per second by a second preset value to obtain a first value;

and the internet terminal determines the first numerical value as the total amount of cache data of the cache database.

2. The method of claim 1, wherein the internet terminal determining whether a backup data network is available comprises:

The internet terminal switches the current data network into a standby data network;

the Internet terminal sends a test request to a specified server by adopting the standby data network;

and if the internet terminal receives the response message of the specified server to the test request, judging that the standby data network is available, and switching the standby data network into the current data network switching.

3. The method of claim 2, wherein the test request is an HTTP request.

4. An apparatus for switching a network of a video service system, wherein the video service system comprises a streaming server and an internet terminal having a cache database, the internet terminal comprising:

the network determining module is used for detecting a current data network and determining a standby data network according to the current data network;

the data acquisition module is used for acquiring video data from the streaming media server by adopting the current data network, storing the video data into the cache database, and setting the total amount of cache data by the cache database;

the stock statistics module is used for counting the stock of the video data in the cache database when the video service is carried out;

The network switching module is used for judging whether the standby data network is available or not when the stock of the video data is smaller than a preset threshold value, and switching the current data network into the standby data network if the standby data network is judged to be available;

the video service system further comprises a video networking server, wherein the video networking server is used for transmitting video data to the streaming media server by adopting video networking, and the preset threshold is determined by the following modules:

the quantity acquisition module is used for acquiring the quantity of video data transmitted by the video networking server every second;

the preset threshold calculating module is used for multiplying the number of the video data transmitted per second by a first preset value to obtain the preset threshold;

further comprises:

the first numerical value calculation module is used for multiplying the number of the video data transmitted per second by a second preset numerical value to obtain a first numerical value;

and the total amount determining module is used for determining the first numerical value as the total amount of cache data of the cache database.

5. An electronic device, comprising:

one or more processors; and

one or more machine readable media having instructions stored thereon, which when executed by the one or more processors, cause the electronic device to perform the steps of the method of any of claims 1 to 3.

6. A computer-readable storage medium, characterized in that it stores a computer program for causing a processor to perform the steps of the method according to any one of claims 1 to 3.

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