KSPROPERTY_CAMERACONTROL_ZOOM_RELATIVE

The KSPROPERTY_CAMERACONTROL_ZOOM_RELATIVE property specifies the zoom status of the camera.

Usage Summary Table

Get Set Target Property descriptor type Property value type
Yes Yes Filter or node KSPROPERTY_CAMERACONTROL_S or KSPROPERTY_CAMERACONTROL_NODE_S LONG

The property value (operation data) is a LONG that specifies a camera's relative zoom setting. The size of the value represents the desired zoom speed; a higher value represents a higher speed.

Value Description
0 Stop zoom lens motion.
Positive value Start moving the zoom lens in the telephoto direction (initiate zoom-in).
Negative value Start moving the zoom lens in the wide angle direction (initiate zoom-out).

Remarks

The Value member of the KSPROPERTY_CAMERACONTROL_NODE_S structure specifies the relative zoom.

Note that a particular device might support only a certain speed range. To determine the range of speeds supported by the device, an application can issue a KSPROPERTY_TYPE_BASICSUPPORT request. You can specify KSPROPERTY_TYPE_BASICSUPPORT in the Flags member of the KSPROPERTY_ITEM structure.

Some devices support only a single zoom speed. In this case, the sign of the Value member indicates whether the lens should zoom in or zoom out.

When making a set request, the client should supply one of the values in the preceding table in the Value member of the KSPROPERTY_CAMERACONTROL_NODE_S structure.

When making a get request, the client receives one of the values in the preceding table in the Value member of the KSPROPERTY_CAMERACONTROL_NODE_S structure. The value indicates the current zoom status of the camera.

Requirements

Header: ksmedia.h (include Ksmedia.h)

See also

KSPROPERTY_CAMERACONTROL_NODE_S