本文關(guān)鍵詞： 嵌入式DVR 文件系統(tǒng) 本地存儲 網(wǎng)絡(luò)存儲 軟件庫 視頻安防　出處：《杭州電子科技大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：安防產(chǎn)業(yè)發(fā)展迅速，嵌入式硬盤錄像機(jī)已經(jīng)得到越來越廣泛的應(yīng)用，作為視頻安防核心技術(shù)之一的存儲技術(shù)的發(fā)展顯得極為重要。通用文件系統(tǒng)具有通用性特點(diǎn)，不受使用平臺限制，方便功能擴(kuò)展，因此本文基于通用文件系統(tǒng)設(shè)計了嵌入式硬盤錄像機(jī)的實(shí)時多媒體存儲系統(tǒng)。該存儲系統(tǒng)實(shí)現(xiàn)了視頻錄像機(jī)本地存儲和網(wǎng)絡(luò)存儲兩大模塊，支持錄像存儲和抓圖存儲等功能，具有更好的移植性和可擴(kuò)展性，滿足了市場的需要。 本論文首先從視頻編解碼技術(shù)、軟硬件技術(shù)、存儲技術(shù)三方面介紹了嵌入式硬盤錄像機(jī)的發(fā)展歷程。然后從嵌入式硬盤錄像機(jī)的硬件結(jié)構(gòu)、軟件結(jié)構(gòu)、基本功能以及平臺軟件的編譯環(huán)境等方面介紹了嵌入式硬盤錄像機(jī)的結(jié)構(gòu)信息，詳細(xì)闡述了嵌入式硬盤錄像機(jī)的特點(diǎn)。 針對嵌入式硬盤錄像機(jī)數(shù)據(jù)存儲持續(xù)時間長，數(shù)據(jù)傳輸量大，數(shù)據(jù)訪問量低，數(shù)據(jù)存儲周期短等特點(diǎn)，本論文設(shè)計了嵌入式硬盤錄像機(jī)存儲模塊軟件庫，該軟件庫采用C/C++編程語言以及Linux相關(guān)系統(tǒng)調(diào)用實(shí)現(xiàn)，所屬嵌入式應(yīng)用層庫。從數(shù)據(jù)存儲位置分，軟件庫可分為本地存儲模塊和網(wǎng)絡(luò)存儲模塊；從層次架構(gòu)分，軟件庫可分為存儲介質(zhì)管理模塊、遠(yuǎn)程目錄管理模塊、工作目錄管理模塊、文件監(jiān)控模塊、數(shù)據(jù)庫模塊、媒體文件模塊、索引文件模塊、文件查詢模塊以及FTP服務(wù)端模塊。 為方便集中管理本地存儲介質(zhì)分區(qū)、格式化等操作，論文設(shè)計了存儲介質(zhì)管理模塊。在網(wǎng)絡(luò)存儲模塊中相對應(yīng)設(shè)計了遠(yuǎn)程目錄管理模塊，實(shí)現(xiàn)遠(yuǎn)程目錄的登錄、掛載等功能。論文規(guī)定一個本地分區(qū)或者一個遠(yuǎn)程目錄對應(yīng)一個工作目錄，論文在存儲介質(zhì)管理模塊和遠(yuǎn)程目錄管理模塊的基礎(chǔ)上設(shè)計了工作目錄管理模塊，實(shí)現(xiàn)了工作目錄類型切換、循環(huán)覆蓋等功能。為實(shí)現(xiàn)文件IO讀寫與文件信息存儲異步操作，提高數(shù)據(jù)存儲效率，在工作目錄管理模塊的基礎(chǔ)上論文設(shè)計了文件監(jiān)控模塊和數(shù)據(jù)庫模塊，文件監(jiān)控模塊監(jiān)控文件的創(chuàng)建、讀寫等事件，將監(jiān)控到的事件信息發(fā)送到數(shù)據(jù)庫模塊中存儲，同時，數(shù)據(jù)庫模塊提供了基于數(shù)據(jù)庫的文件快速查詢接口。在文件監(jiān)控模塊和數(shù)據(jù)庫模塊基礎(chǔ)上，論文設(shè)計了媒體文件模塊，負(fù)責(zé)完成文件的讀寫、文件上電修復(fù)、抓圖索引信息存儲等工作。為支持錄像跳幀回放功能，論文設(shè)計了幀索引模塊，存儲了錄像文件中的I幀信息。同時，論文設(shè)計了文件查詢模塊，支持基于文件目錄的錄像查詢功能和基于索引的抓圖文件查詢功能。最后，論文提供了精簡的功能接口，供上層用戶接口調(diào)用。 最后，，對本系統(tǒng)進(jìn)行了功能測試和系統(tǒng)性能測試。經(jīng)測試，本系統(tǒng)實(shí)現(xiàn)了存儲相關(guān)基本功能，在性能方面，在分辨率為CIF、碼流1024Kb/S編碼格式下，16通道錄像，CPU不高于30%，8通道錄像、抓圖，CPU不高于25%，完全可以滿足嵌入式硬盤錄像機(jī)的存儲需求。
[Abstract]:With the rapid development of security industry, embedded hard disk video recorders have been more and more widely used. The development of storage technology, one of the core technologies of video security, is very important. This paper designs a real-time multimedia storage system of embedded hard disk video recorder based on universal file system. The storage system realizes two modules of local storage and network storage of video recorder. It supports video storage and drawing storage. It has better portability and extensibility, and meets the needs of the market. This paper first introduces the development of embedded hard disk video recorder from three aspects: video coding and decoding technology, hardware and software technology, storage technology, and then introduces the hardware structure and software structure of embedded hard disk video recorder. The basic function and the compiling environment of the platform software are introduced in this paper. The structure information of the embedded hard disk video recorder is introduced, and the characteristics of the embedded hard disk video recorder are described in detail. Aiming at the characteristics of embedded hard disk recorder, such as long data storage time, large amount of data transmission, low data access and short data storage period, this paper designs a software library of storage module of embedded hard disk recorder. The software library is implemented by C / C programming language and Linux related system call, which belongs to the embedded application layer library. From the data storage location, the software library can be divided into local storage module and network storage module, and from the hierarchical architecture, the software library can be divided into local storage module and network storage module. Software library can be divided into storage media management module, remote directory management module, working directory management module, file monitoring module, database module, media file module, index file module, file query module and FTP server module. In order to facilitate centralized management of local storage media partition, format and other operations, a storage media management module is designed in this paper. A remote directory management module is designed in the network storage module to realize the login of the remote directory. The paper defines a local partition or a remote directory corresponding to a working directory. The paper designs a working directory management module based on the storage media management module and the remote directory management module. In order to realize the asynchronous operation of file IO reading and writing and file information storage, the efficiency of data storage is improved. Based on the working directory management module, the paper designs the file monitoring module and the database module. The file monitoring module monitors the creation, reading and writing of files, and sends the monitored event information to the database module to store, at the same time, The database module provides the file fast query interface based on database. On the basis of file monitoring module and database module, the paper designs the media file module, which is responsible for completing the reading and writing of files and repairing the files on electricity. In order to support the function of video playback, this paper designs a frame index module, which stores the I frame information in the video file. At the same time, the paper designs a file query module. Video query based on file directory and drawing file query based on index are supported. Finally, the paper provides a concise functional interface for the upper user interface to call. Finally, the function test and system performance test of the system are carried out. After testing, the system realizes the basic functions of storage. In terms of performance, the resolution is CIF. the CPU of 16 channel video is no more than 30 channels in 1024KB / S coding format. Drawing CPU is no more than 25, it can meet the storage requirements of embedded hard disk recorders.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TP333;TP368.1

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