achieve usb camera acquisition and display on ARM

arm-qtopia版
............\video_test
............\..........\.moc
............\..........\....\release-shared
............\..........\....\..............\moc_mainwindow.cpp
............\..........\.obj
............\..........\....\release-shared
............\..........\....\..............\convert.o
............\..........\....\..............\linux_video.o
............\..........\....\..............\main.o
............\..........\....\..............\mainwindow.o
............\..........\....\..............\moc_mainwindow.o
............\..........\....\..............\v4l2.o
............\..........\....\..............\yuyv_covert_jpeg.o
............\..........\....\..............\yuyv_to_rgb24.o
............\..........\.ui
............\..........\...\release-shared
............\..........\build
............\..........\desktop
............\..........\.......\video_test.desktop
............\..........\main.cpp
............\..........\mainwindow.cpp
............\..........\mainwindow.h
............\..........\Makefile
............\..........\pic
............\..........\...\video_test
............\..........\...\..........\video_test.png
............\..........\si
............\..........\..\Untitled Project.IAB
............\..........\..\Untitled Project.IAD
............\..........\..\Untitled Project.IMB
............\..........\..\Untitled Project.IMD
............\..........\..\Untitled Project.PFI
............\..........\..\Untitled Project.PO
............\..........\..\Untitled Project.PR
............\..........\..\Untitled Project.PRI
............\..........\..\Untitled Project.PS
............\..........\..\Untitled Project.SearchResults
............\..........\..\Untitled Project.WK3
............\..........\v4l2.cpp
............\..........\v4l2.h
............\..........\videodev2.h
............\..........\video_test
............\..........\video_test.pro
............\..........\yuyv_covert_jpeg.cpp
............\..........\yuyv_covert_jpeg.h
............\..........\关于Linux下的视频编程.docx
............\..........\说明.txt

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