75 lines
2.1 KiB
ReStructuredText
75 lines
2.1 KiB
ReStructuredText
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.. -*- coding: utf-8; mode: rst -*-
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.. _v4l2-selection-targets:
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*****************
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Selection targets
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*****************
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The precise meaning of the selection targets may be dependent on which
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of the two interfaces they are used.
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.. _v4l2-selection-targets-table:
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.. tabularcolumns:: |p{5.8cm}|p{1.4cm}|p{6.5cm}|p{1.2cm}|p{1.6cm}|
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.. flat-table:: Selection target definitions
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:header-rows: 1
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:stub-columns: 0
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* - Target name
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- id
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- Definition
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- Valid for V4L2
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- Valid for V4L2 subdev
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* - ``V4L2_SEL_TGT_CROP``
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- 0x0000
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- Crop rectangle. Defines the cropped area.
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- Yes
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- Yes
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* - ``V4L2_SEL_TGT_CROP_DEFAULT``
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- 0x0001
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- Suggested cropping rectangle that covers the "whole picture".
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- Yes
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- No
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* - ``V4L2_SEL_TGT_CROP_BOUNDS``
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- 0x0002
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- Bounds of the crop rectangle. All valid crop rectangles fit inside
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the crop bounds rectangle.
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- Yes
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- Yes
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* - ``V4L2_SEL_TGT_NATIVE_SIZE``
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- 0x0003
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- The native size of the device, e.g. a sensor's pixel array.
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``left`` and ``top`` fields are zero for this target. Setting the
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native size will generally only make sense for memory to memory
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devices where the software can create a canvas of a given size in
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which for example a video frame can be composed. In that case
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V4L2_SEL_TGT_NATIVE_SIZE can be used to configure the size of
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that canvas.
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- Yes
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- Yes
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* - ``V4L2_SEL_TGT_COMPOSE``
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- 0x0100
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- Compose rectangle. Used to configure scaling and composition.
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- Yes
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- Yes
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* - ``V4L2_SEL_TGT_COMPOSE_DEFAULT``
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- 0x0101
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- Suggested composition rectangle that covers the "whole picture".
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- Yes
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- No
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* - ``V4L2_SEL_TGT_COMPOSE_BOUNDS``
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- 0x0102
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- Bounds of the compose rectangle. All valid compose rectangles fit
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inside the compose bounds rectangle.
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- Yes
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- Yes
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* - ``V4L2_SEL_TGT_COMPOSE_PADDED``
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- 0x0103
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- The active area and all padding pixels that are inserted or
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modified by hardware.
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- Yes
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- No
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