1V4L2_FIELD_ANY
2V4L2_FIELD_NONE
3V4L2_FIELD_TOP
4V4L2_FIELD_BOTTOM
5V4L2_FIELD_INTERLACED
6V4L2_FIELD_SEQ_TB
7V4L2_FIELD_SEQ_BT
8V4L2_FIELD_ALTERNATE
9V4L2_FIELD_INTERLACED_TB
10V4L2_FIELD_INTERLACED_BT
11