Livegbs design document of security camera internet live broadcast scheme

LiveGBS Design document

One 、 Introduce

28181 The full name of the agreement is GB/T28181《 Security video monitoring network system information transmission 、 In exchange for 、 Control technical requirements 》, It was proposed by the science and Technology Information Bureau of the Ministry of public security , By the National Security Alarm System Standardization Technical Committee (SAC/TC100) Centralized , A national standard drafted by the first Institute of the Ministry of public security and other units （ hereinafter referred to as 28181）.28181 Agreement in safe cities across the country 、 traffic 、 Widely used in road monitoring , If you want to be a unified big monitoring platform , It supports 28181 Protocol access is essential .
LiveGBS Is based on GB28181, In order to meet the requirements of centralized and unified management and viewing of all cameras 、 Hard disk video recorder and other equipment , Realize the traditional security camera Web No plug-in playback at the end .

Two 、 Function is introduced

• Provide user management and Web Visual page management ;
• Provide equipment status management , It can check whether the device is offline in real time ;
• Real time streaming media processing ,PS（TS） turn ES;
• Real time snapshot 、 Video data acquisition ;
• Equipment condition monitoring ;
• Pan tilt control ;
• Video retrieval 、 The playback ;
• Provide RTMP、HTTP-FLV、HLS And other protocol stream output ;
• Provide external server access status 、 Information , Control, etc. HTTP API Interface ;

3、 ... and 、 System architecture

LiveGBS From the security equipment （IPC、NVR…) To a channel that can be broadcast live on the Internet . Meet the needs of customers while providing standard RESTful API Interface , For user integrated development .

The following is LiveGBS The architecture of the figure ：

3.1、 Presentation layer

Web front end

be based on HTML/HTML5/Vue/CSS3 Development web Front page , Compatible with mainstream browsers . The presentation layer and data layer are completely separated , Realize front and rear data communication through cross domain .

Web player

A set of self encapsulated Video.js、Flash、flv.js With one , And optimize some performance problems , Added screenshots 、 Adaptive width and height 、 Fast / Smooth mode switching and other functions , At the same time, provide the corresponding call interface .

Restful Interface

Based on specific business , use Restful Standard interface , Provide data services to the outside world .

3.2 Service layer

The service layer is divided into signaling management services according to functional modules LiveCMS And streaming media management services LiveSMS Two core modules .

LiveCMS

LiveCMS be responsible for IPC、NVR、 While accessing and managing devices such as video platforms , Provide the function of interacting with users , Respond to all user requests . Have user rights management , For the authority management of device side operation .

1. LiveCMS And equipment through GB28181 The protocol maintains registration and interaction , Including device registration 、 PTZ control, etc ;
2. LiveCMS And users through automatic Web Interface or Restful The interface completes the customer request ;
3. LiveCMS from Redis The database retrieves the status of all devices and LiveSMS The state of ;
5. LiveCMS adopt SIP Signaling notification LiveSMS Start processing stream data ;

LiveSMS

LiveSMS It is the receiving device end PS Video stream data and convert it into ES flow , And then it's packaged into RTMP、HTTP-FLV、HLS Live streaming for distribution . When one LiveSMS When the server performance is insufficient , May adopt LiveSMS Cluster deployment .
Every LiveSMS From the start, it will go to the same Redis Update your configuration in 、 load 、 And the status information of the stream you are currently processing .LiveCMS When a user request is received, it will be sent from Redis Get all LiveSMS Information about , Choose the right one LiveSMS To process the current request .

1. LiveSMS Receiving device PS After flow ,Demux become ES flow
2. Use ES Stream can save pictures
3. ES Streaming is pushed to its own streaming media distributor , Distribute RTMP、HLS、FLV、RTSP flow , At the same time, it can be pushed to user-defined CDN And other streaming services .

LiveSMS The streaming media distribution service included in the is more compatible with various video streams than the ordinary streaming media live broadcast service 、HTTP-FLV Support for 、 Stream information statistics 、 Cache control, etc . At the same time, for the need RTSP Stream user , Scalable RTSP Forwarding service .

Later expansion

LiveGBS It has met the requirements of GB28181 Device access .
LiveGBS Open all functions API Interface , Scalable access to a unified cloud platform to manage and access all onsite LiveGBS.

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