V4L2_FIELD_IS_SEQUENTIAL
swap_fields = (V4L2_FIELD_IS_SEQUENTIAL(infield) &&
V4L2_FIELD_IS_SEQUENTIAL(outfield) &&
V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);
if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
if (!V4L2_FIELD_IS_SEQUENTIAL(sdformat->format.field))
V4L2_FIELD_IS_SEQUENTIAL(outfmt->field);