Documentation/media/uapi/v4l/pixfmt-nv12m.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _V4L2-PIX-FMT-NV12M:
   4 .. _v4l2-pix-fmt-nv12mt-16x16:
   5 .. _V4L2-PIX-FMT-NV21M:
   6
   7 ***********************************************************************************
   8 V4L2_PIX_FMT_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16
   9 ***********************************************************************************
  10
  11 *man V4L2_PIX_FMT_NV12M(2)*
  12
  13 V4L2_PIX_FMT_NV21M
  14 V4L2_PIX_FMT_NV12MT_16X16
  15 Variation of ``V4L2_PIX_FMT_NV12`` and ``V4L2_PIX_FMT_NV21`` with planes
  16 non contiguous in memory.
  17
  18
  19 Description
  20 ===========
  21
  22 This is a multi-planar, two-plane version of the YUV 4:2:0 format. The
  23 three components are separated into two sub-images or planes.
  24 ``V4L2_PIX_FMT_NV12M`` differs from ``V4L2_PIX_FMT_NV12`` in that the
  25 two planes are non-contiguous in memory, i.e. the chroma plane do not
  26 necessarily immediately follows the luma plane. The luminance data
  27 occupies the first plane. The Y plane has one byte per pixel. In the
  28 second plane there is a chrominance data with alternating chroma
  29 samples. The CbCr plane is the same width, in bytes, as the Y plane (and
  30 of the image), but is half as tall in pixels. Each CbCr pair belongs to
  31 four pixels. For example, Cb\ :sub:`0`/Cr\ :sub:`0` belongs to
  32 Y'\ :sub:`00`, Y'\ :sub:`01`, Y'\ :sub:`10`, Y'\ :sub:`11`.
  33 ``V4L2_PIX_FMT_NV12MT_16X16`` is the tiled version of
  34 ``V4L2_PIX_FMT_NV12M`` with 16x16 macroblock tiles. Here pixels are
  35 arranged in 16x16 2D tiles and tiles are arranged in linear order in
  36 memory. ``V4L2_PIX_FMT_NV21M`` is the same as ``V4L2_PIX_FMT_NV12M``
  37 except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr
  38 byte.
  39
  40 ``V4L2_PIX_FMT_NV12M`` is intended to be used only in drivers and
  41 applications that support the multi-planar API, described in
  42 :ref:`planar-apis`.
  43
  44 If the Y plane has pad bytes after each row, then the CbCr plane has as
  45 many pad bytes after its rows.
  46
  47 **Byte Order.**
  48 Each cell is one byte.
  49
  50 .. flat-table::
  51     :header-rows:  0
  52     :stub-columns: 0
  53     :widths:       2 1 1 1 1
  54
  55
  56     -  .. row 1
  57
  58        -  start0 + 0:
  59
  60        -  Y'\ :sub:`00`
  61
  62        -  Y'\ :sub:`01`
  63
  64        -  Y'\ :sub:`02`
  65
  66        -  Y'\ :sub:`03`
  67
  68     -  .. row 2
  69
  70        -  start0 + 4:
  71
  72        -  Y'\ :sub:`10`
  73
  74        -  Y'\ :sub:`11`
  75
  76        -  Y'\ :sub:`12`
  77
  78        -  Y'\ :sub:`13`
  79
  80     -  .. row 3
  81
  82        -  start0 + 8:
  83
  84        -  Y'\ :sub:`20`
  85
  86        -  Y'\ :sub:`21`
  87
  88        -  Y'\ :sub:`22`
  89
  90        -  Y'\ :sub:`23`
  91
  92     -  .. row 4
  93
  94        -  start0 + 12:
  95
  96        -  Y'\ :sub:`30`
  97
  98        -  Y'\ :sub:`31`
  99
 100        -  Y'\ :sub:`32`
 101
 102        -  Y'\ :sub:`33`
 103
 104     -  .. row 5
 105
 106        -
 107
 108     -  .. row 6
 109
 110        -  start1 + 0:
 111
 112        -  Cb\ :sub:`00`
 113
 114        -  Cr\ :sub:`00`
 115
 116        -  Cb\ :sub:`01`
 117
 118        -  Cr\ :sub:`01`
 119
 120     -  .. row 7
 121
 122        -  start1 + 4:
 123
 124        -  Cb\ :sub:`10`
 125
 126        -  Cr\ :sub:`10`
 127
 128        -  Cb\ :sub:`11`
 129
 130        -  Cr\ :sub:`11`
 131
 132
 133 **Color Sample Location..**
 134
 135
 136
 137 .. flat-table::
 138     :header-rows:  0
 139     :stub-columns: 0
 140
 141
 142     -  .. row 1
 143
 144        -
 145        -  0
 146
 147        -
 148        -  1
 149
 150        -  2
 151
 152        -
 153        -  3
 154
 155     -  .. row 2
 156
 157        -  0
 158
 159        -  Y
 160
 161        -
 162        -  Y
 163
 164        -  Y
 165
 166        -
 167        -  Y
 168
 169     -  .. row 3
 170
 171        -
 172        -
 173        -  C
 174
 175        -
 176        -
 177        -  C
 178
 179        -
 180
 181     -  .. row 4
 182
 183        -  1
 184
 185        -  Y
 186
 187        -
 188        -  Y
 189
 190        -  Y
 191
 192        -
 193        -  Y
 194
 195     -  .. row 5
 196
 197        -
 198
 199     -  .. row 6
 200
 201        -  2
 202
 203        -  Y
 204
 205        -
 206        -  Y
 207
 208        -  Y
 209
 210        -
 211        -  Y
 212
 213     -  .. row 7
 214
 215        -
 216        -
 217        -  C
 218
 219        -
 220        -
 221        -
 222        -  C
 223
 224        -
 225
 226     -  .. row 8
 227
 228        -  3
 229
 230        -  Y
 231
 232        -
 233        -  Y
 234
 235        -  Y
 236
 237        -
 238        -  Y