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