Based on kernel version 6.8. Page generated on 2024-03-11 21:26 EST.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 |
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
.. _packed-yuv:
******************
Packed YUV formats
******************
Similarly to the packed RGB formats, the packed YUV formats store the Y, Cb and
Cr components consecutively in memory. They may apply subsampling to the chroma
components and thus differ in how they interlave the three components.
.. note::
- In all the tables that follow, bit 7 is the most significant bit in a byte.
- 'Y', 'Cb' and 'Cr' denote bits of the luma, blue chroma (also known as
'U') and red chroma (also known as 'V') components respectively. 'A'
denotes bits of the alpha component (if supported by the format), and 'X'
denotes padding bits.
4:4:4 Subsampling
=================
These formats do not subsample the chroma components and store each pixels as a
full triplet of Y, Cb and Cr values.
The next table lists the packed YUV 4:4:4 formats with less than 8 bits per
component. They are named based on the order of the Y, Cb and Cr components as
seen in a 16-bit word, which is then stored in memory in little endian byte
order, and on the number of bits for each component. For instance the YUV565
format stores a pixel in a 16-bit word [15:0] laid out at as [Y'\ :sub:`4-0`
Cb\ :sub:`5-0` Cr\ :sub:`4-0`], and stored in memory in two bytes,
[Cb\ :sub:`2-0` Cr\ :sub:`4-0`] followed by [Y'\ :sub:`4-0` Cb\ :sub:`5-3`].
.. raw:: latex
\begingroup
\scriptsize
\setlength{\tabcolsep}{2pt}
.. tabularcolumns:: |p{3.5cm}|p{0.96cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|p{0.52cm}|
.. flat-table:: Packed YUV 4:4:4 Image Formats (less than 8bpc)
:header-rows: 2
:stub-columns: 0
* - Identifier
- Code
- :cspan:`7` Byte 0 in memory
- :cspan:`7` Byte 1
* -
-
- 7
- 6
- 5
- 4
- 3
- 2
- 1
- 0
- 7
- 6
- 5
- 4
- 3
- 2
- 1
- 0
* .. _V4L2-PIX-FMT-YUV444:
- ``V4L2_PIX_FMT_YUV444``
- 'Y444'
- Cb\ :sub:`3`
- Cb\ :sub:`2`
- Cb\ :sub:`1`
- Cb\ :sub:`0`
- Cr\ :sub:`3`
- Cr\ :sub:`2`
- Cr\ :sub:`1`
- Cr\ :sub:`0`
- a\ :sub:`3`
- a\ :sub:`2`
- a\ :sub:`1`
- a\ :sub:`0`
- Y'\ :sub:`3`
- Y'\ :sub:`2`
- Y'\ :sub:`1`
- Y'\ :sub:`0`
* .. _V4L2-PIX-FMT-YUV555:
- ``V4L2_PIX_FMT_YUV555``
- 'YUVO'
- Cb\ :sub:`2`
- Cb\ :sub:`1`
- Cb\ :sub:`0`
- Cr\ :sub:`4`
- Cr\ :sub:`3`
- Cr\ :sub:`2`
- Cr\ :sub:`1`
- Cr\ :sub:`0`
- a
- Y'\ :sub:`4`
- Y'\ :sub:`3`
- Y'\ :sub:`2`
- Y'\ :sub:`1`
- Y'\ :sub:`0`
- Cb\ :sub:`4`
- Cb\ :sub:`3`
* .. _V4L2-PIX-FMT-YUV565:
- ``V4L2_PIX_FMT_YUV565``
- 'YUVP'
- Cb\ :sub:`2`
- Cb\ :sub:`1`
- Cb\ :sub:`0`
- Cr\ :sub:`4`
- Cr\ :sub:`3`
- Cr\ :sub:`2`
- Cr\ :sub:`1`
- Cr\ :sub:`0`
- Y'\ :sub:`4`
- Y'\ :sub:`3`
- Y'\ :sub:`2`
- Y'\ :sub:`1`
- Y'\ :sub:`0`
- Cb\ :sub:`5`
- Cb\ :sub:`4`
- Cb\ :sub:`3`
.. raw:: latex
\endgroup
.. note::
For the YUV444 and YUV555 formats, the value of alpha bits is undefined
when reading from the driver, ignored when writing to the driver, except
when alpha blending has been negotiated for a :ref:`Video Overlay
<overlay>` or :ref:`Video Output Overlay <osd>`.
The next table lists the packed YUV 4:4:4 formats with 8 bits per component.
They are named based on the order of the Y, Cb and Cr components as stored in
memory, and on the total number of bits per pixel. For instance, the VUYX32
format stores a pixel with Cr\ :sub:`7-0` in the first byte, Cb\ :sub:`7-0` in
the second byte and Y'\ :sub:`7-0` in the third byte.
.. flat-table:: Packed YUV Image Formats (8bpc)
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Byte 0
- Byte 1
- Byte 2
- Byte 3
* .. _V4L2-PIX-FMT-YUV32:
- ``V4L2_PIX_FMT_YUV32``
- 'YUV4'
- A\ :sub:`7-0`
- Y'\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Cr\ :sub:`7-0`
* .. _V4L2-PIX-FMT-AYUV32:
- ``V4L2_PIX_FMT_AYUV32``
- 'AYUV'
- A\ :sub:`7-0`
- Y'\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Cr\ :sub:`7-0`
* .. _V4L2-PIX-FMT-XYUV32:
- ``V4L2_PIX_FMT_XYUV32``
- 'XYUV'
- X\ :sub:`7-0`
- Y'\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Cr\ :sub:`7-0`
* .. _V4L2-PIX-FMT-VUYA32:
- ``V4L2_PIX_FMT_VUYA32``
- 'VUYA'
- Cr\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Y'\ :sub:`7-0`
- A\ :sub:`7-0`
* .. _V4L2-PIX-FMT-VUYX32:
- ``V4L2_PIX_FMT_VUYX32``
- 'VUYX'
- Cr\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Y'\ :sub:`7-0`
- X\ :sub:`7-0`
* .. _V4L2-PIX-FMT-YUVA32:
- ``V4L2_PIX_FMT_YUVA32``
- 'YUVA'
- Y'\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Cr\ :sub:`7-0`
- A\ :sub:`7-0`
* .. _V4L2-PIX-FMT-YUVX32:
- ``V4L2_PIX_FMT_YUVX32``
- 'YUVX'
- Y'\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Cr\ :sub:`7-0`
- X\ :sub:`7-0`
* .. _V4L2-PIX-FMT-YUV24:
- ``V4L2_PIX_FMT_YUV24``
- 'YUV3'
- Y'\ :sub:`7-0`
- Cb\ :sub:`7-0`
- Cr\ :sub:`7-0`
- -\
.. note::
- The alpha component is expected to contain a meaningful value that can be
used by drivers and applications.
- The padding bits contain undefined values that must be ignored by all
applications and drivers.
The next table lists the packed YUV 4:4:4 formats with 12 bits per component.
Expand the bits per component to 16 bits, data in the high bits, zeros in the low bits,
arranged in little endian order, storing 1 pixel in 6 bytes.
.. flat-table:: Packed YUV 4:4:4 Image Formats (12bpc)
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Byte 1-0
- Byte 3-2
- Byte 5-4
- Byte 7-6
- Byte 9-8
- Byte 11-10
* .. _V4L2-PIX-FMT-YUV48-12:
- ``V4L2_PIX_FMT_YUV48_12``
- 'Y312'
- Y'\ :sub:`0`
- Cb\ :sub:`0`
- Cr\ :sub:`0`
- Y'\ :sub:`1`
- Cb\ :sub:`1`
- Cr\ :sub:`1`
4:2:2 Subsampling
=================
These formats, commonly referred to as YUYV or YUY2, subsample the chroma
components horizontally by 2, storing 2 pixels in a container. The container
is 32-bits for 8-bit formats, and 64-bits for 10+-bit formats.
The packed YUYV formats with more than 8 bits per component are stored as four
16-bit little-endian words. Each word's most significant bits contain one
component, and the least significant bits are zero padding.
.. raw:: latex
\footnotesize
.. tabularcolumns:: |p{3.4cm}|p{1.2cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|
.. flat-table:: Packed YUV 4:2:2 Formats in 32-bit container
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Byte 0
- Byte 1
- Byte 2
- Byte 3
- Byte 4
- Byte 5
- Byte 6
- Byte 7
* .. _V4L2-PIX-FMT-UYVY:
- ``V4L2_PIX_FMT_UYVY``
- 'UYVY'
- Cb\ :sub:`0`
- Y'\ :sub:`0`
- Cr\ :sub:`0`
- Y'\ :sub:`1`
- Cb\ :sub:`2`
- Y'\ :sub:`2`
- Cr\ :sub:`2`
- Y'\ :sub:`3`
* .. _V4L2-PIX-FMT-VYUY:
- ``V4L2_PIX_FMT_VYUY``
- 'VYUY'
- Cr\ :sub:`0`
- Y'\ :sub:`0`
- Cb\ :sub:`0`
- Y'\ :sub:`1`
- Cr\ :sub:`2`
- Y'\ :sub:`2`
- Cb\ :sub:`2`
- Y'\ :sub:`3`
* .. _V4L2-PIX-FMT-YUYV:
- ``V4L2_PIX_FMT_YUYV``
- 'YUYV'
- Y'\ :sub:`0`
- Cb\ :sub:`0`
- Y'\ :sub:`1`
- Cr\ :sub:`0`
- Y'\ :sub:`2`
- Cb\ :sub:`2`
- Y'\ :sub:`3`
- Cr\ :sub:`2`
* .. _V4L2-PIX-FMT-YVYU:
- ``V4L2_PIX_FMT_YVYU``
- 'YVYU'
- Y'\ :sub:`0`
- Cr\ :sub:`0`
- Y'\ :sub:`1`
- Cb\ :sub:`0`
- Y'\ :sub:`2`
- Cr\ :sub:`2`
- Y'\ :sub:`3`
- Cb\ :sub:`2`
.. tabularcolumns:: |p{3.4cm}|p{1.2cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|p{0.8cm}|
.. flat-table:: Packed YUV 4:2:2 Formats in 64-bit container
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Word 0
- Word 1
- Word 2
- Word 3
* .. _V4L2-PIX-FMT-Y210:
- ``V4L2_PIX_FMT_Y210``
- 'Y210'
- Y'\ :sub:`0` (bits 15-6)
- Cb\ :sub:`0` (bits 15-6)
- Y'\ :sub:`1` (bits 15-6)
- Cr\ :sub:`0` (bits 15-6)
* .. _V4L2-PIX-FMT-Y212:
- ``V4L2_PIX_FMT_Y212``
- 'Y212'
- Y'\ :sub:`0` (bits 15-4)
- Cb\ :sub:`0` (bits 15-4)
- Y'\ :sub:`1` (bits 15-4)
- Cr\ :sub:`0` (bits 15-4)
* .. _V4L2-PIX-FMT-Y216:
- ``V4L2_PIX_FMT_Y216``
- 'Y216'
- Y'\ :sub:`0` (bits 15-0)
- Cb\ :sub:`0` (bits 15-0)
- Y'\ :sub:`1` (bits 15-0)
- Cr\ :sub:`0` (bits 15-0)
.. raw:: latex
\normalsize
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally.
4:1:1 Subsampling
=================
This format subsamples the chroma components horizontally by 4, storing 8
pixels in 12 bytes.
.. raw:: latex
\scriptsize
.. tabularcolumns:: |p{2.9cm}|p{0.8cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|p{0.5cm}|
.. flat-table:: Packed YUV 4:1:1 Formats
:header-rows: 1
:stub-columns: 0
* - Identifier
- Code
- Byte 0
- Byte 1
- Byte 2
- Byte 3
- Byte 4
- Byte 5
- Byte 6
- Byte 7
- Byte 8
- Byte 9
- Byte 10
- Byte 11
* .. _V4L2-PIX-FMT-Y41P:
- ``V4L2_PIX_FMT_Y41P``
- 'Y41P'
- Cb\ :sub:`0`
- Y'\ :sub:`0`
- Cr\ :sub:`0`
- Y'\ :sub:`1`
- Cb\ :sub:`4`
- Y'\ :sub:`2`
- Cr\ :sub:`4`
- Y'\ :sub:`3`
- Y'\ :sub:`4`
- Y'\ :sub:`5`
- Y'\ :sub:`6`
- Y'\ :sub:`7`
.. raw:: latex
\normalsize
.. note::
Do not confuse ``V4L2_PIX_FMT_Y41P`` with
:ref:`V4L2_PIX_FMT_YUV411P <V4L2-PIX-FMT-YUV411P>`. Y41P is derived from
"YUV 4:1:1 **packed**", while YUV411P stands for "YUV 4:1:1 **planar**".
**Color Sample Location:**
Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>`
horizontally.
|
