pwc_whitebalance  258 extra_lib/include/avcap/linux/pwc-ioctl.h #define VIDIOCPWCSAWB           _IOW('v', 202, struct pwc_whitebalance)
pwc_whitebalance  259 extra_lib/include/avcap/linux/pwc-ioctl.h #define VIDIOCPWCGAWB           _IOR('v', 202, struct pwc_whitebalance)