8.1.1. Selection targets

The precise meaning of the selection targets may be dependent on which of the two interfaces they are used.

Selection target definitions

Target name	id	Definition	Valid for V4L2	Valid for V4L2 subdev
V4L2_SEL_TGT_CROP	0x0000	Crop rectangle. Defines the cropped area.	Yes	Yes
V4L2_SEL_TGT_CROP_DEFAULT	0x0001	Suggested cropping rectangle that covers the “whole picture”.	Yes	No
V4L2_SEL_TGT_CROP_BOUNDS	0x0002	Bounds of the crop rectangle. All valid crop rectangles fit inside the crop bounds rectangle.	Yes	Yes
V4L2_SEL_TGT_NATIVE_SIZE	0x0003	The native size of the device, e.g. a sensor’s pixel array. left and top fields are zero for this target. Setting the native size will generally only make sense for memory to memory devices where the software can create a canvas of a given size in which for example a video frame can be composed. In that case V4L2_SEL_TGT_NATIVE_SIZE can be used to configure the size of that canvas.	Yes	Yes
V4L2_SEL_TGT_COMPOSE	0x0100	Compose rectangle. Used to configure scaling and composition.	Yes	Yes
V4L2_SEL_TGT_COMPOSE_DEFAULT	0x0101	Suggested composition rectangle that covers the “whole picture”.	Yes	No
V4L2_SEL_TGT_COMPOSE_BOUNDS	0x0102	Bounds of the compose rectangle. All valid compose rectangles fit inside the compose bounds rectangle.	Yes	Yes
V4L2_SEL_TGT_COMPOSE_PADDED	0x0103	The active area and all padding pixels that are inserted or modified by hardware.	Yes	No