camera

http://blog.csdn.net/flyingpipi/article/details/5773666
http://hi.baidu.com/kellyvivian/blog/item/5ea8244b91e20c3aafc3ab95.html
http://v4l2spec.bytesex.org/spec/

http://blog.csdn.net/zjcysww/article/details/3603561

http://blog.csdn.net/mtv0312/article/details/6193579