CN103442210B - Rear end audio and video data processing method for video monitoring system - Google Patents

Abstract

The present invention relates to a kind of rear end audio and video data processing method for video monitoring system, comprise the following steps: 1) video data storage, computer stores after being compressed by the audio, video data of front-end collection；2), time to needs data readback, the audio, video data after compression is processed by computer；3) audio, video data after processing is played out and shows by computer.Compared with prior art, the present invention has use cycle length, cost performance is high, implement the advantages such as more flexible.

Description

Back-end audio and video data processing method for video surveillance system

technical field

The invention relates to an audio and video data processing method, in particular to a back-end audio and video data processing method for a video surveillance system.

Background technique

Recently, the "Two Sessions" of the State Grid Corporation issued the company's No. 1 document in 2012, "Opinions on Comprehensively Promoting the Construction of the "Three Collections and Five Majors" System." The core content of the "two transformations" is to promote the intensive management of human resources and property and the construction of the "big planning, big construction, big operation, big overhaul, big marketing" system. At present, the State Grid has entered a new stage of development, which puts forward higher requirements for improving the control ability of large power grids and strengthening professional and lean management. Among them, "big construction" is to unify the management process, technical specifications and construction standards of power grid construction, strengthen the management and control of key links in construction, strengthen the professional management of construction functions, engineering projects and construction teams, improve the safety quality and technological level of power grid construction, and improve Building management efficiency and effectiveness. To comprehensively promote the construction of a large-scale construction system, it is necessary to optimize various management systems, improve enterprise standards, study and formulate management, work and technical standards for distribution network construction according to the system framework formulated by the company, and gradually establish a unified system of systems and standards; pay attention to the development of Training for all staff, so that the employees on the front line of infrastructure construction can master the construction management system and technical specifications; it is necessary to study and formulate measures based on the actual situation of the unit to ensure the smooth handover of engineering construction projects and ensure the safety and stability of the transitional stage of project management; it is necessary to further improve the information management and control of construction management The platform strengthens the information management and control of key nodes of engineering construction, strengthens the two-way interaction of information at all levels in the vertical direction of construction management and the horizontal sharing with other businesses, and effectively improves management efficiency.

However, the construction process of the power grid involves many majors such as project management, civil engineering, and electrical engineering. The cross-industry operations are very obvious, the construction environment is harsh, and there are many construction safety risks and potential safety hazards. These are the problems that exist in the construction process of the power grid. . In contrast to the spirit of the country's "three sets and five majors" and the strengthening of information management and control of key nodes of engineering construction and the need for safety and stability in the transitional stage of project management, the current construction process and construction site management and control capabilities are not strong, and there is a lack of safety monitoring. technical means.

The video surveillance system is an integral part of the security system, and it is a comprehensive system with strong prevention capabilities. In recent years, video surveillance has been widely used in various fields such as aerospace, safety emergency, medical and health because of its intuition, convenience, and rich information content. In recent years, with the rapid development of computer, network, image processing and transmission technology, video surveillance technology has also made great progress.

At present, the processing of data collected by video surveillance generally has defects such as poor security, large video data capacity, and high implementation cost.

Contents of the invention

The object of the present invention is to provide a back-end audio and video data processing method for a video surveillance system in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A back-end audio and video data processing method for a video surveillance system, characterized in that it comprises the following steps:

1) Video data storage, the computer stores the audio and video data collected by the front end after compression;

2) When data playback is required, the computer processes the compressed audio and video data;

3) The computer plays and displays the processed audio and video data.

The processing of the compressed audio and video data by the computer is specifically as follows:

a) The file source filter reads raw data from the byte stream file;

b) The AVI split filter parses the byte stream into individual video frames and audio samples;

c) The decoding filter decodes the video frame, and sends the decoded video frame to the video rendering filter, and sends the audio sample to the default DirectSound device filter;

d) After the video rendering filter draws the video frame, it sends it to the monitor for display;

e) The default DirectSound device filter sends audio samples to the sound card.

The decoding video frame of the decoding filter is specifically:

First parse the input data;

Then the parsed texture data, shape data and motion data are sent to the texture decoder, shape decoder and motion decoder for corresponding decoding;

Finally, the reconstructed video object plane is obtained by combining the decoded shape, motion and texture information.

The texture decoder includes a VLD decoding unit, an inverse scanning unit, an AC/DC predictive decoding unit, an inverse quantization unit and an inverse DCT transformation unit connected in sequence.

The motion decoder includes a sequentially connected motion vector decoding unit and a motion compensation unit.

Compared with the prior art, the present invention has the following advantages:,

1. The processing of audio and video data is realized through software, and the upgrade is realized through continuous updating, which has a long service life, high cost performance, and relatively flexible implementation;

2. The audio and video data can be played and displayed on the computer in a fast, less lossy, high-quality image and synchronously.

Description of drawings

Fig. 1 is the audio-video data processing flowchart of the present invention;

FIG. 2 is a flow chart of decoding video frames in the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example

A method for processing back-end audio and video data for a video surveillance system, comprising the following steps:

1) Video data storage, the computer stores the audio and video data collected by the front end after compression;

2) When data playback is required, the computer processes the compressed audio and video data;

3) The computer plays and displays the processed audio and video data.

As shown in Figure 1, described computer is specifically processed to the compressed audio and video data as follows:

a) The file source filter reads raw data from the byte stream file;

b) The AVI split filter parses the byte stream into individual video frames and audio samples;

c) The decoding filter decodes the video frame, and sends the decoded video frame to the video rendering filter, and sends the audio sample to the default DirectSound device filter;

d) After the video rendering filter draws the video frame, it sends it to the monitor for display;

e) The default DirectSound device filter sends audio samples to the sound card.

As shown in Figure 2, the decoding video frame of the decoding filter is specifically:

First parse the input data;

Then the parsed texture data, shape data and motion data are sent to the texture decoder, shape decoder and motion decoder for corresponding decoding;

Finally, the reconstructed video object plane is obtained by combining the decoded shape, motion and texture information.

The texture decoder includes a VLD decoding unit, an inverse scanning unit, an AC/DC predictive decoding unit, an inverse quantization unit and an inverse DCT transformation unit connected in sequence. The motion decoder includes a sequentially connected motion vector decoding unit and a motion compensation unit.

In order to enable audio and video to be played and displayed synchronously, the present invention uses DirectShow technology to simplify the creation of digital media applications on the Microsoft platform by separating complex processes such as application programs from data transmission, hardware differentiation, and synchronization.

In order to achieve the throughput required by video and audio streams, DirectShow uses DirectDraw and DirectSound technologies as much as possible. These techniques can effectively submit data to the sound card and graphics card. DirectShow achieves synchronous playback by encapsulating media data samples with timestamps. DirectShow uses a modular structure so that applications can fuse and match different software components called filters. DirectShow uses a modular structure, and each stage of processing is accomplished through a COM component called a filter. DirectShow provides a set of standard filters for applications, and developers customize their own filters to extend DirectShow.

Claims (3)

1. the rear end audio and video data processing method for video monitoring system, it is characterised in that include with Lower step:

1) video data storage, computer stores after being compressed by the audio, video data of front-end collection；

2), time to needs data readback, the audio, video data after compression is processed by computer；

3) audio, video data after processing is played out and shows by computer；

Described computer to compression after audio, video data process particularly as follows:

A) file source wave filter reads initial data from byte stream files；

B) AVI splits filter-divider and byte stream resolves to single frame of video and audio sample；

C) decoding filter decoding frame of video, and decoded video frame is sent to Video Rendering wave filter, simultaneously Audio sample is sent to default DirectSound equipment wave filter；

D) it is sent to display after Video Rendering wave filter drafting frame of video show；

Audio sample is delivered to sound card by e) default DirectSound equipment wave filter；

Described decoding filter decoding frame of video particularly as follows:

First input data are resolved；

Then data texturing, shape data and the exercise data after parsing is delivered to Texture decoder, shape solution respectively Code device and motion decoder decode accordingly；

Finally by the video object plane merging decoded shape, motion and texture information acquisition is rebuild.

A kind of rear end audio and video data processing method for video monitoring system the most according to claim 1, It is characterized in that, VLD decoding unit that described Texture decoder includes being sequentially connected with, counter-scanning unit, AC/DC prediction decoding unit, inverse quantization unit and inverse DCT converter unit.

A kind of rear end audio and video data processing method for video monitoring system the most according to claim 1, It is characterized in that, described motion decoder includes motion vector decoding unit and the motion compensation list being sequentially connected with Unit.