Documentation/media/uapi/v4l/pixfmt-nv16.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 .. _V4L2-PIX-FMT-NV16:
   4 .. _V4L2-PIX-FMT-NV61:
   5
   6 ******************************************************
   7 V4L2_PIX_FMT_NV16 ('NV16'), V4L2_PIX_FMT_NV61 ('NV61')
   8 ******************************************************
   9
  10 *man V4L2_PIX_FMT_NV16(2)*
  11
  12 V4L2_PIX_FMT_NV61
  13 Formats with ½ horizontal chroma resolution, also known as YUV 4:2:2.
  14 One luminance and one chrominance plane with alternating chroma samples
  15 as opposed to ``V4L2_PIX_FMT_YVU420``
  16
  17
  18 Description
  19 ===========
  20
  21 These are two-plane versions of the YUV 4:2:2 format. The three
  22 components are separated into two sub-images or planes. The Y plane is
  23 first. The Y plane has one byte per pixel. For ``V4L2_PIX_FMT_NV16``, a
  24 combined CbCr plane immediately follows the Y plane in memory. The CbCr
  25 plane is the same width and height, in bytes, as the Y plane (and of the
  26 image). Each CbCr pair belongs to two pixels. For example,
  27 Cb\ :sub:`0`/Cr\ :sub:`0` belongs to Y'\ :sub:`00`, Y'\ :sub:`01`.
  28 ``V4L2_PIX_FMT_NV61`` is the same except the Cb and Cr bytes are
  29 swapped, the CrCb plane starts with a Cr byte.
  30
  31 If the Y plane has pad bytes after each row, then the CbCr plane has as
  32 many pad bytes after its rows.
  33
  34 **Byte Order.**
  35 Each cell is one byte.
  36
  37
  38
  39 .. flat-table::
  40     :header-rows:  0
  41     :stub-columns: 0
  42     :widths:       2 1 1 1 1
  43
  44
  45     -  .. row 1
  46
  47        -  start + 0:
  48
  49        -  Y'\ :sub:`00`
  50
  51        -  Y'\ :sub:`01`
  52
  53        -  Y'\ :sub:`02`
  54
  55        -  Y'\ :sub:`03`
  56
  57     -  .. row 2
  58
  59        -  start + 4:
  60
  61        -  Y'\ :sub:`10`
  62
  63        -  Y'\ :sub:`11`
  64
  65        -  Y'\ :sub:`12`
  66
  67        -  Y'\ :sub:`13`
  68
  69     -  .. row 3
  70
  71        -  start + 8:
  72
  73        -  Y'\ :sub:`20`
  74
  75        -  Y'\ :sub:`21`
  76
  77        -  Y'\ :sub:`22`
  78
  79        -  Y'\ :sub:`23`
  80
  81     -  .. row 4
  82
  83        -  start + 12:
  84
  85        -  Y'\ :sub:`30`
  86
  87        -  Y'\ :sub:`31`
  88
  89        -  Y'\ :sub:`32`
  90
  91        -  Y'\ :sub:`33`
  92
  93     -  .. row 5
  94
  95        -  start + 16:
  96
  97        -  Cb\ :sub:`00`
  98
  99        -  Cr\ :sub:`00`
 100
 101        -  Cb\ :sub:`01`
 102
 103        -  Cr\ :sub:`01`
 104
 105     -  .. row 6
 106
 107        -  start + 20:
 108
 109        -  Cb\ :sub:`10`
 110
 111        -  Cr\ :sub:`10`
 112
 113        -  Cb\ :sub:`11`
 114
 115        -  Cr\ :sub:`11`
 116
 117     -  .. row 7
 118
 119        -  start + 24:
 120
 121        -  Cb\ :sub:`20`
 122
 123        -  Cr\ :sub:`20`
 124
 125        -  Cb\ :sub:`21`
 126
 127        -  Cr\ :sub:`21`
 128
 129     -  .. row 8
 130
 131        -  start + 28:
 132
 133        -  Cb\ :sub:`30`
 134
 135        -  Cr\ :sub:`30`
 136
 137        -  Cb\ :sub:`31`
 138
 139        -  Cr\ :sub:`31`
 140
 141
 142 **Color Sample Location..**
 143
 144
 145
 146 .. flat-table::
 147     :header-rows:  0
 148     :stub-columns: 0
 149
 150
 151     -  .. row 1
 152
 153        -
 154        -  0
 155
 156        -
 157        -  1
 158
 159        -  2
 160
 161        -
 162        -  3
 163
 164     -  .. row 2
 165
 166        -  0
 167
 168        -  Y
 169
 170        -
 171        -  Y
 172
 173        -  Y
 174
 175        -
 176        -  Y
 177
 178     -  .. row 3
 179
 180        -
 181        -
 182        -  C
 183
 184        -
 185        -
 186        -  C
 187
 188        -
 189
 190     -  .. row 4
 191
 192        -  1
 193
 194        -  Y
 195
 196        -
 197        -  Y
 198
 199        -  Y
 200
 201        -
 202        -  Y
 203
 204     -  .. row 5
 205
 206        -
 207        -
 208        -  C
 209
 210        -
 211        -
 212        -  C
 213
 214        -
 215
 216     -  .. row 6
 217
 218        -
 219
 220     -  .. row 7
 221
 222        -  2
 223
 224        -  Y
 225
 226        -
 227        -  Y
 228
 229        -  Y
 230
 231        -
 232        -  Y
 233
 234     -  .. row 8
 235
 236        -
 237        -
 238        -  C
 239
 240        -
 241        -
 242        -  C
 243
 244        -
 245
 246     -  .. row 9
 247
 248        -  3
 249
 250        -  Y
 251
 252        -
 253        -  Y
 254
 255        -  Y
 256
 257        -
 258        -  Y
 259
 260     -  .. row 10
 261
 262        -
 263        -
 264        -  C
 265
 266        -
 267        -
 268        -  C
 269
 270        -