// ksmedia.h

typedef struct {
  KSNODEPROPERTY NodeProperty;
  LONG           lOcularFocalLength;
  LONG           lObjectiveFocalLengthMin;
  LONG           lObjectiveFocalLengthMax;
} KSPROPERTY_CAMERACONTROL_NODE_FOCAL_LENGTH_S, *PKSPROPERTY_CAMERACONTROL_NODE_FOCAL_LENGTH_S;
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Windows Driver Kit DDI reference (ns-ksmedia-ksproperty_cameracontrol_node_focal_length_s)

KSPROPERTY_CAMERACONTROL_NODE_FOCAL_LENGTH_S structure

Description

The KSPROPERTY_CAMERACONTROL_NODE_FOCAL_LENGTH_S structure returns node-specific data requested using the KSPROPERTY_CAMERACONTROL_FOCAL_LENGTH property.

Members

`NodeProperty`

Specifies both the target node and the property to get. This member is an initialized structure of type KSNODEPROPERTY.

`lOcularFocalLength`

Specifies a value of type LONG containing the focal length of the lens closest to the camera user.

`lObjectiveFocalLengthMin`

Specifies a value of type LONG containing the minimum focal length of the lens closest to the camera subject.

`lObjectiveFocalLengthMax`

Specifies a value of type LONG containing the maximum focal length of the lens closest to the camera subject.

Remarks

If the camera has only one lens, these values can be used to represent zoom ratios. See KSPROPERTY_CAMERACONTROL_FOCAL_LENGTH.

KSPROPERTY_CAMERACONTROL_NODE_FOCAL_LENGTH_S - NtDoc