1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2 3.. _packed-yuv: 4 5****************** 6Packed YUV formats 7****************** 8 9Similarly to the packed RGB formats, the packed YUV formats store the Y, Cb and 10Cr components consecutively in memory. They may apply subsampling to the chroma 11components and thus differ in how they interlave the three components. 12 13.. note:: 14 15 - In all the tables that follow, bit 7 is the most significant bit in a byte. 16 - 'Y', 'Cb' and 'Cr' denote bits of the luma, blue chroma (also known as 17 'U') and red chroma (also known as 'V') components respectively. 'A' 18 denotes bits of the alpha component (if supported by the format), and 'X' 19 denotes padding bits. 20 21 224:4:4 Subsampling 23================= 24 25These formats do not subsample the chroma components and store each pixels as a 26full triplet of Y, Cb and Cr values. 27 28The next table lists the packed YUV 4:4:4 formats with less than 8 bits per 29component. They are named based on the order of the Y, Cb and Cr components as 30seen in a 16-bit word, which is then stored in memory in little endian byte 31order, and on the number of bits for each component. For instance the YUV565 32format stores a pixel in a 16-bit word [15:0] laid out at as [Y'\ :sub:`4-0` 33Cb\ :sub:`5-0` Cr\ :sub:`4-0`], and stored in memory in two bytes, 34[Cb\ :sub:`2-0` Cr\ :sub:`4-0`] followed by [Y'\ :sub:`4-0` Cb\ :sub:`5-3`]. 35 36.. raw:: latex 37 38 \begingroup 39 \scriptsize 40 \setlength{\tabcolsep}{2pt} 41 42.. 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}| 43 44.. flat-table:: Packed YUV 4:4:4 Image Formats (less than 8bpc) 45 :header-rows: 2 46 :stub-columns: 0 47 48 * - Identifier 49 - Code 50 51 - :cspan:`7` Byte 0 in memory 52 53 - :cspan:`7` Byte 1 54 55 * - 56 - 57 - 7 58 - 6 59 - 5 60 - 4 61 - 3 62 - 2 63 - 1 64 - 0 65 66 - 7 67 - 6 68 - 5 69 - 4 70 - 3 71 - 2 72 - 1 73 - 0 74 75 * .. _V4L2-PIX-FMT-YUV444: 76 77 - ``V4L2_PIX_FMT_YUV444`` 78 - 'Y444' 79 80 - Cb\ :sub:`3` 81 - Cb\ :sub:`2` 82 - Cb\ :sub:`1` 83 - Cb\ :sub:`0` 84 - Cr\ :sub:`3` 85 - Cr\ :sub:`2` 86 - Cr\ :sub:`1` 87 - Cr\ :sub:`0` 88 89 - a\ :sub:`3` 90 - a\ :sub:`2` 91 - a\ :sub:`1` 92 - a\ :sub:`0` 93 - Y'\ :sub:`3` 94 - Y'\ :sub:`2` 95 - Y'\ :sub:`1` 96 - Y'\ :sub:`0` 97 98 * .. _V4L2-PIX-FMT-YUV555: 99 100 - ``V4L2_PIX_FMT_YUV555`` 101 - 'YUVO' 102 103 - Cb\ :sub:`2` 104 - Cb\ :sub:`1` 105 - Cb\ :sub:`0` 106 - Cr\ :sub:`4` 107 - Cr\ :sub:`3` 108 - Cr\ :sub:`2` 109 - Cr\ :sub:`1` 110 - Cr\ :sub:`0` 111 112 - a 113 - Y'\ :sub:`4` 114 - Y'\ :sub:`3` 115 - Y'\ :sub:`2` 116 - Y'\ :sub:`1` 117 - Y'\ :sub:`0` 118 - Cb\ :sub:`4` 119 - Cb\ :sub:`3` 120 121 * .. _V4L2-PIX-FMT-YUV565: 122 123 - ``V4L2_PIX_FMT_YUV565`` 124 - 'YUVP' 125 126 - Cb\ :sub:`2` 127 - Cb\ :sub:`1` 128 - Cb\ :sub:`0` 129 - Cr\ :sub:`4` 130 - Cr\ :sub:`3` 131 - Cr\ :sub:`2` 132 - Cr\ :sub:`1` 133 - Cr\ :sub:`0` 134 135 - Y'\ :sub:`4` 136 - Y'\ :sub:`3` 137 - Y'\ :sub:`2` 138 - Y'\ :sub:`1` 139 - Y'\ :sub:`0` 140 - Cb\ :sub:`5` 141 - Cb\ :sub:`4` 142 - Cb\ :sub:`3` 143 144.. raw:: latex 145 146 \endgroup 147 148.. note:: 149 150 For the YUV444 and YUV555 formats, the value of alpha bits is undefined 151 when reading from the driver, ignored when writing to the driver, except 152 when alpha blending has been negotiated for a :ref:`Video Overlay 153 <overlay>` or :ref:`Video Output Overlay <osd>`. 154 155 156The next table lists the packed YUV 4:4:4 formats with 8 bits per component. 157They are named based on the order of the Y, Cb and Cr components as stored in 158memory, and on the total number of bits per pixel. For instance, the VUYX32 159format stores a pixel with Cr\ :sub:`7-0` in the first byte, Cb\ :sub:`7-0` in 160the second byte and Y'\ :sub:`7-0` in the third byte. 161 162.. flat-table:: Packed YUV Image Formats (8bpc) 163 :header-rows: 1 164 :stub-columns: 0 165 166 * - Identifier 167 - Code 168 - Byte 0 169 - Byte 1 170 - Byte 2 171 - Byte 3 172 173 * .. _V4L2-PIX-FMT-YUV32: 174 175 - ``V4L2_PIX_FMT_YUV32`` 176 - 'YUV4' 177 178 - A\ :sub:`7-0` 179 - Y'\ :sub:`7-0` 180 - Cb\ :sub:`7-0` 181 - Cr\ :sub:`7-0` 182 183 * .. _V4L2-PIX-FMT-AYUV32: 184 185 - ``V4L2_PIX_FMT_AYUV32`` 186 - 'AYUV' 187 188 - A\ :sub:`7-0` 189 - Y'\ :sub:`7-0` 190 - Cb\ :sub:`7-0` 191 - Cr\ :sub:`7-0` 192 193 * .. _V4L2-PIX-FMT-XYUV32: 194 195 - ``V4L2_PIX_FMT_XYUV32`` 196 - 'XYUV' 197 198 - X\ :sub:`7-0` 199 - Y'\ :sub:`7-0` 200 - Cb\ :sub:`7-0` 201 - Cr\ :sub:`7-0` 202 203 * .. _V4L2-PIX-FMT-VUYA32: 204 205 - ``V4L2_PIX_FMT_VUYA32`` 206 - 'VUYA' 207 208 - Cr\ :sub:`7-0` 209 - Cb\ :sub:`7-0` 210 - Y'\ :sub:`7-0` 211 - A\ :sub:`7-0` 212 213 * .. _V4L2-PIX-FMT-VUYX32: 214 215 - ``V4L2_PIX_FMT_VUYX32`` 216 - 'VUYX' 217 218 - Cr\ :sub:`7-0` 219 - Cb\ :sub:`7-0` 220 - Y'\ :sub:`7-0` 221 - X\ :sub:`7-0` 222 223 * .. _V4L2-PIX-FMT-YUVA32: 224 225 - ``V4L2_PIX_FMT_YUVA32`` 226 - 'YUVA' 227 228 - Y'\ :sub:`7-0` 229 - Cb\ :sub:`7-0` 230 - Cr\ :sub:`7-0` 231 - A\ :sub:`7-0` 232 233 * .. _V4L2-PIX-FMT-YUVX32: 234 235 - ``V4L2_PIX_FMT_YUVX32`` 236 - 'YUVX' 237 238 - Y'\ :sub:`7-0` 239 - Cb\ :sub:`7-0` 240 - Cr\ :sub:`7-0` 241 - X\ :sub:`7-0` 242 243 * .. _V4L2-PIX-FMT-YUV24: 244 245 - ``V4L2_PIX_FMT_YUV24`` 246 - 'YUV3' 247 248 - Y'\ :sub:`7-0` 249 - Cb\ :sub:`7-0` 250 - Cr\ :sub:`7-0` 251 - -\ 252 253.. note:: 254 255 - The alpha component is expected to contain a meaningful value that can be 256 used by drivers and applications. 257 - The padding bits contain undefined values that must be ignored by all 258 applications and drivers. 259 260The next table lists the packed YUV 4:4:4 formats with 12 bits per component. 261Expand the bits per component to 16 bits, data in the high bits, zeros in the low bits, 262arranged in little endian order, storing 1 pixel in 6 bytes. 263 264.. flat-table:: Packed YUV 4:4:4 Image Formats (12bpc) 265 :header-rows: 1 266 :stub-columns: 0 267 268 * - Identifier 269 - Code 270 - Byte 1-0 271 - Byte 3-2 272 - Byte 5-4 273 - Byte 7-6 274 - Byte 9-8 275 - Byte 11-10 276 277 * .. _V4L2-PIX-FMT-YUV48-12: 278 279 - ``V4L2_PIX_FMT_YUV48_12`` 280 - 'Y312' 281 282 - Y'\ :sub:`0` 283 - Cb\ :sub:`0` 284 - Cr\ :sub:`0` 285 - Y'\ :sub:`1` 286 - Cb\ :sub:`1` 287 - Cr\ :sub:`1` 288 2894:2:2 Subsampling 290================= 291 292These formats, commonly referred to as YUYV or YUY2, subsample the chroma 293components horizontally by 2, storing 2 pixels in a container. The container 294is 32-bits for 8-bit formats, and 64-bits for 10+-bit formats. 295 296The packed YUYV formats with more than 8 bits per component are stored as four 29716-bit little-endian words. Each word's most significant bits contain one 298component, and the least significant bits are zero padding. 299 300.. raw:: latex 301 302 \footnotesize 303 304.. 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}| 305 306.. flat-table:: Packed YUV 4:2:2 Formats in 32-bit container 307 :header-rows: 1 308 :stub-columns: 0 309 310 * - Identifier 311 - Code 312 - Byte 0 313 - Byte 1 314 - Byte 2 315 - Byte 3 316 - Byte 4 317 - Byte 5 318 - Byte 6 319 - Byte 7 320 * .. _V4L2-PIX-FMT-UYVY: 321 322 - ``V4L2_PIX_FMT_UYVY`` 323 - 'UYVY' 324 325 - Cb\ :sub:`0` 326 - Y'\ :sub:`0` 327 - Cr\ :sub:`0` 328 - Y'\ :sub:`1` 329 - Cb\ :sub:`2` 330 - Y'\ :sub:`2` 331 - Cr\ :sub:`2` 332 - Y'\ :sub:`3` 333 * .. _V4L2-PIX-FMT-VYUY: 334 335 - ``V4L2_PIX_FMT_VYUY`` 336 - 'VYUY' 337 338 - Cr\ :sub:`0` 339 - Y'\ :sub:`0` 340 - Cb\ :sub:`0` 341 - Y'\ :sub:`1` 342 - Cr\ :sub:`2` 343 - Y'\ :sub:`2` 344 - Cb\ :sub:`2` 345 - Y'\ :sub:`3` 346 * .. _V4L2-PIX-FMT-YUYV: 347 348 - ``V4L2_PIX_FMT_YUYV`` 349 - 'YUYV' 350 351 - Y'\ :sub:`0` 352 - Cb\ :sub:`0` 353 - Y'\ :sub:`1` 354 - Cr\ :sub:`0` 355 - Y'\ :sub:`2` 356 - Cb\ :sub:`2` 357 - Y'\ :sub:`3` 358 - Cr\ :sub:`2` 359 * .. _V4L2-PIX-FMT-YVYU: 360 361 - ``V4L2_PIX_FMT_YVYU`` 362 - 'YVYU' 363 364 - Y'\ :sub:`0` 365 - Cr\ :sub:`0` 366 - Y'\ :sub:`1` 367 - Cb\ :sub:`0` 368 - Y'\ :sub:`2` 369 - Cr\ :sub:`2` 370 - Y'\ :sub:`3` 371 - Cb\ :sub:`2` 372 373.. 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}| 374 375.. flat-table:: Packed YUV 4:2:2 Formats in 64-bit container 376 :header-rows: 1 377 :stub-columns: 0 378 379 * - Identifier 380 - Code 381 - Word 0 382 - Word 1 383 - Word 2 384 - Word 3 385 * .. _V4L2-PIX-FMT-Y210: 386 387 - ``V4L2_PIX_FMT_Y210`` 388 - 'Y210' 389 390 - Y'\ :sub:`0` (bits 15-6) 391 - Cb\ :sub:`0` (bits 15-6) 392 - Y'\ :sub:`1` (bits 15-6) 393 - Cr\ :sub:`0` (bits 15-6) 394 * .. _V4L2-PIX-FMT-Y212: 395 396 - ``V4L2_PIX_FMT_Y212`` 397 - 'Y212' 398 399 - Y'\ :sub:`0` (bits 15-4) 400 - Cb\ :sub:`0` (bits 15-4) 401 - Y'\ :sub:`1` (bits 15-4) 402 - Cr\ :sub:`0` (bits 15-4) 403 * .. _V4L2-PIX-FMT-Y216: 404 405 - ``V4L2_PIX_FMT_Y216`` 406 - 'Y216' 407 408 - Y'\ :sub:`0` (bits 15-0) 409 - Cb\ :sub:`0` (bits 15-0) 410 - Y'\ :sub:`1` (bits 15-0) 411 - Cr\ :sub:`0` (bits 15-0) 412 413.. raw:: latex 414 415 \normalsize 416 417**Color Sample Location:** 418Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>` 419horizontally. 420 421 4224:1:1 Subsampling 423================= 424 425This format subsamples the chroma components horizontally by 4, storing 8 426pixels in 12 bytes. 427 428.. raw:: latex 429 430 \scriptsize 431 432.. 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}| 433 434.. flat-table:: Packed YUV 4:1:1 Formats 435 :header-rows: 1 436 :stub-columns: 0 437 438 * - Identifier 439 - Code 440 - Byte 0 441 - Byte 1 442 - Byte 2 443 - Byte 3 444 - Byte 4 445 - Byte 5 446 - Byte 6 447 - Byte 7 448 - Byte 8 449 - Byte 9 450 - Byte 10 451 - Byte 11 452 * .. _V4L2-PIX-FMT-Y41P: 453 454 - ``V4L2_PIX_FMT_Y41P`` 455 - 'Y41P' 456 457 - Cb\ :sub:`0` 458 - Y'\ :sub:`0` 459 - Cr\ :sub:`0` 460 - Y'\ :sub:`1` 461 - Cb\ :sub:`4` 462 - Y'\ :sub:`2` 463 - Cr\ :sub:`4` 464 - Y'\ :sub:`3` 465 - Y'\ :sub:`4` 466 - Y'\ :sub:`5` 467 - Y'\ :sub:`6` 468 - Y'\ :sub:`7` 469 470.. raw:: latex 471 472 \normalsize 473 474.. note:: 475 476 Do not confuse ``V4L2_PIX_FMT_Y41P`` with 477 :ref:`V4L2_PIX_FMT_YUV411P <V4L2-PIX-FMT-YUV411P>`. Y41P is derived from 478 "YUV 4:1:1 **packed**", while YUV411P stands for "YUV 4:1:1 **planar**". 479 480**Color Sample Location:** 481Chroma samples are :ref:`interstitially sited<yuv-chroma-centered>` 482horizontally. 483