CN102655602B - Decoding device for adaptive clients and plugin acquisition method - Google Patents

Abstract

The invention discloses an adaptive client decoding device and a plug-in acquisition method in the technical fields of video monitoring and communication. The invention comprises a decoding algorithm plug-in module, a matching module and an adaptive decoder; the decoding algorithm plug-in module is connected to the matching module; the matching module is connected to the self-adaptive decoder; the decoding algorithm plug-in module contains the format conversion programs of all cameras in the railway video monitoring system , Decoding program and decoding plug-in interface definition are used to realize the unified call and management of decoding algorithm plug-ins; the matching module is used to receive the compressed video stream and obtain the corresponding decoding algorithm; the adaptive decoder is used to realize the decoding function. The invention solves the compatibility problem of multi-vendor video formats and saves the cost of replacing cameras and other related equipment.

Description

An adaptive client decoding device and a plug-in acquisition method

technical field

The invention belongs to the technical fields of video monitoring and communication, and in particular relates to an adaptive client decoding device and a plug-in acquisition method.

Background technique

With the rapid development of China's railways and the continuous acceleration of trains, especially in recent years, the continuous advancement of the railway rapid passenger transport network, coal transportation channels, and western railway construction, the importance, universality, and sharing of video surveillance have also been further strengthened. Due to the intuitiveness and visibility of video surveillance, it can be used as an important auxiliary means for railway fire prevention, disaster prevention, theft prevention, accident rescue, and the soul of dispatching. It can provide an immersive effect for dispatching commanders who are not on the scene. It provides great help for the command and management of the railway transportation system, and is of great significance for improving railway transportation capacity, ensuring passenger safety and normal train operation.

In order to meet the multi-level distributed management requirements of domestic large and medium-sized urban railway systems, it is necessary to build a railway video surveillance interconnection platform based on the existing video surveillance system technology, and build a production operation command, traffic safety video surveillance, key area video A unified integrated video surveillance system integrating monitoring and emergency handling. In the process of building an interconnection platform for railway video surveillance systems, one of the problems to be solved is: the existing video surveillance systems are established by various railway departments according to their respective business needs. video formats vary. How to convert these data resources in different formats into a unified video and audio format that can be read and accessed, so that different users can view or operate them easily.

At present, there are mainly two ways to solve this problem:

The first method is to update the encoders and decoders of all cameras in the railway video surveillance system to conform to one codec for each user to read. This method is simple and procedural; however, due to historical reasons, there are a large number of cameras of different brands and different decoders across the road, and the unified update operation will consume a lot of money and manpower, and it is almost impossible to replace all encoders and decoders benefit.

The second method is to set up a dedicated conversion format and unified decoding computer server in the railway video surveillance system, so that the data uploaded by all cameras can be decoded uniformly, so that each terminal can be recognized and used. Under the premise that the camera data is less and the computer can undertake the work, this method is a time-saving and labor-saving method; however, it is also the reason for the huge number of different types of cameras in the video surveillance network, this method will overwhelm the computer server, The cost is expensive, and after the video code stream has undergone multiple encoding and decoding processes, it is easy to cause video distortion, thereby reducing the video quality.

The above two solutions still have a common shortcoming, that is, both solutions first decode the code stream and then transmit it on the network, which increases the burden on the network bandwidth and reduces the network utilization rate. Therefore, on the basis of the integration of various cameras in the existing railway video surveillance system, it is necessary to find a video decoding technology for a wide variety of cameras, simple operation, no burden on the computer, and saving manpower and material resources. Convert different data formats into unified video and audio that can be viewed and accessed, and finally displayed on the terminal, and cooperate with the terminal to transmit and process video and audio data to regional nodes.

Contents of the invention

In view of the many shortcomings mentioned above in the background technology, the present invention proposes an adaptive client decoding device and a plug-in acquisition method.

The technical solution of the present invention is an adaptive client decoding device, which is characterized in that the device includes a decoding algorithm plug-in module, a matching module and an adaptive decoder;

The decoding algorithm plug-in module is connected to the matching module; the matching module is connected to the adaptive decoder;

The decoding algorithm plug-in module is used to realize the unified calling and management of the decoding algorithm plug-in;

The matching module is used to receive the compressed video stream and obtain the corresponding decoding algorithm;

The adaptive decoder is used to realize the decoding function.

The video data received by the adaptive client decoding device is packaged data conforming to the real-time transport protocol format.

A plug-in acquisition method for an adaptive client decoding device, characterized in that the method includes the following steps:

Step 1: The client terminal sends a control command to the video terminal, requesting to upload the specified data stream;

Step 2: The video terminal uploads the specified data stream to the data distribution server, and the data distribution server distributes the specified data stream to the client terminal;

Step 3: According to the encoding algorithm corresponding to the specified data stream, the matching module obtains the corresponding decoding algorithm from the decoding algorithm plug-in module in the form of a matching file, analyzes and interprets the description script of the decoding algorithm, and converts it into one that the processor can recognize Instruction sequence, and passed to the adaptive decoder for loading;

Step 4: The adaptive decoder loads the decoding program, decodes the data stream, and displays it through the display device of the client terminal.

Technical effect of the present invention is as follows:

1) Avoid multiple encoding and decoding processes to ensure the quality of transmitted video;

2) Due to the integration of decoding programs from different manufacturers, the problem of multi-vendor video format compatibility is well solved, which greatly saves the cost of replacing cameras and other related equipment;

3) Because it only plays a role when the user needs to display and call, and does not convert those video materials that are not required to be displayed, it can save conversion costs;

4) Since no decoding conversion is performed when the code stream is transmitted, even a narrower channel can support the transmission of the code stream, unlike the need for a wider channel to transmit after code conversion.

Description of drawings

Fig. 1 is the structural diagram of the adaptive client decoding module of the railway video surveillance system;

Fig. 2 is a flowchart of the acquisition of decoding algorithm plug-in signaling channel and data channel by the adaptive client decoding method of the railway video surveillance system.

Detailed ways

The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

In the present invention, the self-adaptive decoding plug-in library is installed on the client terminal to implement unified decoding and conversion of code streams transmitted from different video systems, and finally display on the terminal. The decoding plug-in library designed by the present invention does not convert directly when encountering different code streams, but invokes each conversion program when needed. That is to say, the camera data still relies on different code streams during the transmission process, but once the client needs to call and display the video data, it can use this technology to decode the code stream uniformly, so that each client can see in time same video material.

The present invention provides an adaptive client decoding device applied to a railway video monitoring system, so as to obtain high-quality video and minimize bandwidth occupancy, including:

The decoding algorithm plug-in module includes the format conversion program and decoding program of all cameras used in the railway video surveillance system. The decoding algorithm plug-in module provides a unified decoding plug-in interface definition for existing camera manufacturers, and realizes the unified call and management of the decoding algorithm plug-in ;

The matching module acquires a corresponding decoding algorithm for the received compressed video stream.

Adaptive decoder, used to implement the decoding function. The adaptive decoder decodes the data stream sent by the video terminal according to the decoding algorithm plug-in, so that each client can see the same video data in time.

The decoding algorithm plug-in management library provides unified decoding plug-in interface definitions for existing manufacturers, and the decoding plug-ins in the library are distinguished by video device information. According to the encoding algorithm corresponding to the uploaded data stream, the matching function module obtains the corresponding decoding algorithm in the form of a matching file, analyzes and interprets the algorithm description script in it, converts it into an instruction sequence that the processor can recognize, and passes it to the The adaptive decoder loads; the adaptive decoder loads a decoding program to decode the data stream.

The adaptive client decoding device of the railway video surveillance system is set in the client terminal, and the video data received by the device is data packaged in accordance with the Real-time Transport Protocol (RTP) format.

Another technical problem to be solved by the present invention is that the present invention also provides an adaptive client decoding plug-in acquisition method applied to the railway video surveillance system. implemented, mainly including:

Step 1: The client terminal sends a control command to the video terminal, requesting to upload the specified data stream;

Step 2: The video terminal uploads the specified data stream to the data distribution server, and the data distribution server distributes the specified data stream to the client terminal;

Step 3: According to the encoding algorithm corresponding to the specified data stream, the matching module obtains the corresponding decoding algorithm from the decoding algorithm plug-in module in the form of a matching file, analyzes and interprets the description script of the decoding algorithm, and converts it into one that the processor can recognize Instruction sequence, and passed to the adaptive decoder for loading;

Step 4: The adaptive decoder loads the decoding program, decodes the data stream, and displays it through the display device of the client terminal.

The client terminal involved in the present invention mainly includes a user monitoring terminal and a display device. The user monitoring terminal is to provide users with a video operation and browsing interface. Users can view real-time and historical video images through the monitoring terminal, confirm and process the alarms generated by video analysis, and control the PTZ of the camera according to the authority; the display device refers to the large screen System equipment, LCD screens, video monitors, etc.

The video terminal involved in the present invention is a system for providing codes for uploading video streams. A system that exists at the access node and realizes video collection, aggregation and uploading, video storage, and ground analysis in different monitoring modes.

The integrated video surveillance system interconnection platform involved in the present invention provides a signaling control server (SCU) and a data distribution server (DDU), which are used to realize calls between client terminals, video terminals, and heterogeneous video terminal systems, and The code stream sent by the video terminal is uploaded to the corresponding client terminal.

Fig. 1 is an adaptive client decoding device applied to a railway video surveillance system, including a decoding algorithm plug-in management library, a matching function module and an adaptive decoder. The device is set on the client terminal of the railway video surveillance system. Wherein, the decoding algorithm plug-in management library may itself store multiple decoding algorithm plug-ins, corresponding to multiple decoding formats. The matching function module performs decoding algorithm matching in the decoding algorithm plug-in management library according to the received compressed video stream, and passes it to the "adaptive decoder" for loading.

After the client adaptive decoder is loaded with the decoding program, it can decode and convert the decoding format in the decoding algorithm plug-in for the data stream.

The following is a flowchart of the method for realizing adaptive client decoding in the present invention, and the method is applied in a railway video monitoring system. As shown in Figure 2, the adaptive client decoding method of the railway video surveillance system has the following steps:

1) Initial session establishment. The client terminal sends a SIP INVITE request to establish a dialog command to the SCU in the interconnection platform of the integrated video surveillance system, where the SIP INVITE should indicate the ID of the device in the corresponding video terminal. The SCU forwards the command to the corresponding video terminal device according to the ID number in the SIP INVITE, the video terminal responds to the request, and the session is established;

2) Establish a session control channel. The client terminal sends control and operation commands to the SCU, and the commands adopt the SIP protocol (RFC3621). In the railway video surveillance system, the main operations of the client to the video terminal include real-time video access, historical video access, PTZ control and alarm reading. operate;

3) Establish a data transmission channel. The client terminal sends a TCP connection to the DDU, and the DDU forwards the TCP command to the video terminal, and the video terminal responds to the response, and the TCP channel is established successfully;

4) The video terminal uploads the corresponding RTP data stream to the DDU according to the instruction. The code stream should indicate the encoding and decoding information adopted by the equipment, and the DDU uploads the RTP data stream to the client terminal;

5) At the client terminal, the RTP data code stream first passes through the adaptive decoding device, and the decoding algorithm plug-in library calls the corresponding decoding program according to the equipment information contained in the code stream, and the adaptive decoder realizes a certain resolution requirement. The video decoding function finally realizes the display on the client terminal.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (1)

1. A plug-in acquisition method applied to a railway video surveillance system interconnection platform using an adaptive client decoding device, said decoding device comprising a decoding algorithm plug-in module, a matching module and an adaptive decoder; said decoding algorithm plug-in module and The matching module is connected; the matching module is connected to the adaptive decoder; the decoding algorithm plug-in module is used to realize the unified calling and management of the decoding algorithm plug-in; the matching module is used to receive the compressed video stream and obtain the corresponding decoding algorithm; The adaptive decoder is used to realize the decoding function; the video data received by the adaptive client decoding device is packaged data conforming to the real-time transport protocol format; the interconnection platform of the railway video monitoring system includes a signaling control server SCU and data distribution Server DDU; It is characterized in that the method comprises the following steps: 1) Initial session establishment: The client terminal sends a SIP INVITE request to establish a dialogue command to the SCU in the interconnection platform of the video integrated monitoring system, where the SIP INVITE indicates the ID of the device in the corresponding video terminal; the SCU forwards the command according to the ID number in the SIP INVITE to the corresponding video terminal device, the video terminal responds to the request, and the session is established; 2) Establish a session control channel: the client terminal sends control and operation commands to the SCU, and the command adopts the SIP protocol RFC3621. In the interconnection platform of the railway video surveillance system, the main operations of the client terminal on the video terminal include real-time video access, historical video access, PTZ control and alarm reading four operations; 3) Establish a data transmission channel: the client terminal sends a TCP connection to the DDU, the DDU forwards the TCP command to the video terminal, the video terminal responds to the response, and the TCP channel is established successfully;  4) The video terminal uploads the corresponding RTP data stream to the DDU according to the instruction. The code stream should indicate the encoding and decoding information adopted by the device, and the DDU uploads the RTP data stream to the client terminal; 5) At the client terminal, the RTP data stream first passes through the adaptive decoding device, and the decoding algorithm plug-in library calls the corresponding decoding program according to the equipment information contained in the code stream, and realizes the video under the resolution requirement in the adaptive decoder. The decoding function finally realizes the display on the client terminal. the