基于802.11網(wǎng)絡(luò)的無線視頻傳輸系統(tǒng)設(shè)計(jì)

1、摘要中文摘要隨著無線通信技術(shù)和計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)的飛速發(fā)展，無線網(wǎng)絡(luò)傳輸帶寬不斷提高，。實(shí)時(shí)數(shù)據(jù)傳輸能力不斷增強(qiáng)，無線局域網(wǎng)日益普及，基于無線局域網(wǎng)的視頻傳輸成‘為了研究的熱點(diǎn)。與有線網(wǎng)絡(luò)相比，無線網(wǎng)絡(luò)具有組網(wǎng)靈活、可擴(kuò)展性強(qiáng)、便攜性、好、網(wǎng)絡(luò)改造方便、維護(hù)費(fèi)用低等優(yōu)點(diǎn)。、、本文提出了一種基于嵌入式Linux操作系統(tǒng)、采用ARM920T內(nèi)核的$3C2440A：“一一堡入式微處理器為軟硬件平臺(tái)的實(shí)時(shí)無線視頻傳輸系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)方案，該系統(tǒng)‘可

2、將經(jīng)過MPEG4軟件壓縮編碼后的視頻圖像通過80211無線網(wǎng)絡(luò)傳輸?shù)揭曨l服務(wù)器，實(shí)現(xiàn)對(duì)視頻圖像的分析，存儲(chǔ)和顯示。論文中首先介紹了系統(tǒng)的總體設(shè)計(jì)，包括系統(tǒng)的硬件設(shè)計(jì)以及系統(tǒng)軟件開發(fā)環(huán)境的建立。其中，交叉編譯環(huán)境的構(gòu)建是完成后續(xù)開發(fā)工作的基礎(chǔ)，Qt的移植為開發(fā)板上應(yīng)用程序的運(yùn)行創(chuàng)造了條件。接下來介紹了系統(tǒng)主要功能模塊的設(shè)計(jì)與實(shí)現(xiàn)，包括視頻數(shù)據(jù)采集模塊、無線視頻傳輸模塊的硬件設(shè)計(jì)、嵌入式Linux的驅(qū)動(dòng)程序移植、MPEG4數(shù)字視頻軟件壓縮以

3、及應(yīng)用程序的實(shí)現(xiàn)。該系統(tǒng)采用UDP協(xié)議以及RTP／RTCP協(xié)議實(shí)現(xiàn)了80211無線局域網(wǎng)內(nèi)的視頻傳輸，可靠性高且易于使用，可方便的應(yīng)用到以無線視頻為基礎(chǔ)的無線視頻監(jiān)控、無線視頻會(huì)議等需要進(jìn)行視頻傳輸?shù)膱?chǎng)合。關(guān)鍵詞：嵌入式Linux無線視頻傳輸MPEG4視頻采集驅(qū)動(dòng)程序軟件壓縮墊墨I(xiàn)llllllIIIII]llllllllrtIIJI]]lrlll；Y1806425AbstractWiththerapiddevelopmentofthew

4、irelesscommunicationtechnologyandthecomputernetworktechnologythebandwidthofwirelessnetworkhasbeenimproved，andtherealtimedatatransmissionabilityofwirelessnetworkisaisobeingenhancedconfinuouslyAlsowiththepopularizationofth

5、eWirelessLAN(WLAN)，thevideotransmissiontechnologybasedonWLANhasbecometheresearchhotspotComparedwiththewirednetwork，wirelessnetworkhasmanyadvantagessuchasflexiblenetworkstructure，goodexpansibilityandportabilityconvenientn

6、etworkreconstructlowmaintenaneecost，etcInthispaperthedesignandrealizationofareal—timewirelessvideotransmissionsystembasedonembeddedLinuxOSand$3C2440AmicroprocessorwhichUSeSanembeddedARM920Tkernelispresented111esystemCant

7、ransmitvideoimagescompressedbyMPEG4compressionencodingsoftwaretothevideoserverwherethevideoimagebeanalysed，storedanddisplayedvia80211wirelessnetworkFirstlytheoveralldesignofthesystem，includingthehardwaredesignandtheestab

8、lishmentofthesoftwaredevelopmentenvironment，ispresentedAmongthem，buildingofthecrosscompilingenvironmentisthebasisofthecompletionofthefollowupdevelopmentworkThetransplantationofQtcreatestheconditionsforapplicationsoftware

9、runningThenthedesignandimplementationofthemainfunctionmodulesofthesystemareintroducedThemainfunctionmodulesincludethevideodatacapturemodule，thehardwareofthewirelessvideotransmissionmodule，thetransplantationoftheembeddedL

10、inuxdrivers，theMPEG4digitalvideocompressionsoftwareandtheapplicationsoftwareTheuserdatagramprotocol(UDP)andreal—timetransportprotocol／real—timetransportcontrolprotocol(RTP／RTCP)areappliedinthesystemtoimplementvideotransm

11、issionsin80211WLANThesystemcanachievehi吐reliabilityandconvenientusageIttailbeeasilyappliedtothevideotransmissionoccasionssuchaswirelessvideosurveillance，wirelessvideoconferencewhichbasedonwirelessvideoKeywords：embeddedLi