一个在2440上测试通过的USB摄像头测试程序，直接交叉编译生成可执行文件就可以用了。-In 2440 a test on through the USB cameras test procedures, direct cross-compiling generation executable file can use it.

cairo-1.4.12的源码，编译arm的gstreamer时需要用到。-cairo-1.4.12 source code, need to use when compiling arm of gstreamer.