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camera_test_v4:can open/close preview 800*600 on LCD,with optional parameter buffer count
camera_test_v5:can set resolution 640*480,800*600

printf("usage: ./camera_test [buffer count]\n"
                                "win_x     window x\n"
                                "win_y     window y\n"
                                "win_w     window width\n"
                                "win_h     window height\n"
                                "width    the width image\n"
                                "height    the height image\n"
                                "format    1 is to file 0 is to lcd\n"
                                "device    /dev/videox\n"
                                "-help     display this information\n");

./test_camera 4 0 0 640 480 640 480 1 /dev/video100
camera文件夹里的程序事另一个camera程序，里面还可以借鉴位多目录makefile的摸版