Documentation/media/uapi/v4l/v4l2-selection-targets.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _v4l2-selection-targets:
   4
   5 *****************
   6 Selection targets
   7 *****************
   8
   9 The precise meaning of the selection targets may be dependent on which
  10 of the two interfaces they are used.
  11
  12
  13 .. _v4l2-selection-targets-table:
  14
  15 .. flat-table:: Selection target definitions
  16     :header-rows:  1
  17     :stub-columns: 0
  18
  19
  20     -  .. row 1
  21
  22        -  Target name
  23
  24        -  id
  25
  26        -  Definition
  27
  28        -  Valid for V4L2
  29
  30        -  Valid for V4L2 subdev
  31
  32     -  .. row 2
  33
  34        -  ``V4L2_SEL_TGT_CROP``
  35
  36        -  0x0000
  37
  38        -  Crop rectangle. Defines the cropped area.
  39
  40        -  Yes
  41
  42        -  Yes
  43
  44     -  .. row 3
  45
  46        -  ``V4L2_SEL_TGT_CROP_DEFAULT``
  47
  48        -  0x0001
  49
  50        -  Suggested cropping rectangle that covers the "whole picture".
  51
  52        -  Yes
  53
  54        -  No
  55
  56     -  .. row 4
  57
  58        -  ``V4L2_SEL_TGT_CROP_BOUNDS``
  59
  60        -  0x0002
  61
  62        -  Bounds of the crop rectangle. All valid crop rectangles fit inside
  63           the crop bounds rectangle.
  64
  65        -  Yes
  66
  67        -  Yes
  68
  69     -  .. row 5
  70
  71        -  ``V4L2_SEL_TGT_NATIVE_SIZE``
  72
  73        -  0x0003
  74
  75        -  The native size of the device, e.g. a sensor's pixel array.
  76           ``left`` and ``top`` fields are zero for this target. Setting the
  77           native size will generally only make sense for memory to memory
  78           devices where the software can create a canvas of a given size in
  79           which for example a video frame can be composed. In that case
  80           V4L2_SEL_TGT_NATIVE_SIZE can be used to configure the size of
  81           that canvas.
  82
  83        -  Yes
  84
  85        -  Yes
  86
  87     -  .. row 6
  88
  89        -  ``V4L2_SEL_TGT_COMPOSE``
  90
  91        -  0x0100
  92
  93        -  Compose rectangle. Used to configure scaling and composition.
  94
  95        -  Yes
  96
  97        -  Yes
  98
  99     -  .. row 7
 100
 101        -  ``V4L2_SEL_TGT_COMPOSE_DEFAULT``
 102
 103        -  0x0101
 104
 105        -  Suggested composition rectangle that covers the "whole picture".
 106
 107        -  Yes
 108
 109        -  No
 110
 111     -  .. row 8
 112
 113        -  ``V4L2_SEL_TGT_COMPOSE_BOUNDS``
 114
 115        -  0x0102
 116
 117        -  Bounds of the compose rectangle. All valid compose rectangles fit
 118           inside the compose bounds rectangle.
 119
 120        -  Yes
 121
 122        -  Yes
 123
 124     -  .. row 9
 125
 126        -  ``V4L2_SEL_TGT_COMPOSE_PADDED``
 127
 128        -  0x0103
 129
 130        -  The active area and all padding pixels that are inserted or
 131           modified by hardware.
 132
 133        -  Yes
 134
 135        -  No