v4l2 acquisition as well as the use of SDL linux platform graphics output

v4l2_test_code
..............\swc.c
..............\makefile
..............\swc.c.bak
..............\opt.c
..............\screen.o
..............\swc
..............\video.o
..............\screen.h
..............\opt.h
..............\video.c
..............\opt.c.bak
..............\opt.o
..............\screen.c
..............\video.c.bak
..............\swc.o
..............\makefile.bak
..............\video.h
..............\video.h.bak

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