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