// ksmedia.h

typedef struct {
  KSPROPERTY Property;
  LONG       lOcularFocalLength;
  LONG       lObjectiveFocalLengthMin;
  LONG       lObjectiveFocalLengthMax;
} KSPROPERTY_CAMERACONTROL_FOCAL_LENGTH_S, *PKSPROPERTY_CAMERACONTROL_FOCAL_LENGTH_S;
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Windows Driver Kit DDI reference (ns-ksmedia-ksproperty_cameracontrol_focal_length_s)

KSPROPERTY_CAMERACONTROL_FOCAL_LENGTH_S structure

Description

The KSPROPERTY_CAMERACONTROL_FOCAL_LENGTH_S structure returns filter-specific data requested using the KSPROPERTY_CAMERACONTROL_FOCAL_LENGTH property.

Members

`Property`

Specifies an initialized KSPROPERTY structure that describes the property set, property ID, and request type.

`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_FOCAL_LENGTH_S - NtDoc