1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> 2 <HTML 3 ><HEAD 4 ><TITLE 5 >V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</TITLE 6 ><META 7 NAME="GENERATOR" 8 CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK 9 REL="HOME" 10 TITLE="Video for Linux Two API Specification" 11 HREF="book1.htm"><LINK 12 REL="UP" 13 TITLE="YUV Formats" 14 HREF="x3891.htm"><LINK 15 REL="PREVIOUS" 16 TITLE="V4L2_PIX_FMT_Y41P ('Y41P')" 17 HREF="r4629.htm"><LINK 18 REL="NEXT" 19 TITLE="V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')" 20 HREF="r5016.htm"></HEAD 21 ><BODY 22 CLASS="REFENTRY" 23 BGCOLOR="#FFFFFF" 24 TEXT="#000000" 25 LINK="#0000FF" 26 VLINK="#840084" 27 ALINK="#0000FF" 28 ><DIV 29 CLASS="NAVHEADER" 30 ><TABLE 31 SUMMARY="Header navigation table" 32 WIDTH="100%" 33 BORDER="0" 34 CELLPADDING="0" 35 CELLSPACING="0" 36 ><TR 37 ><TH 38 COLSPAN="3" 39 ALIGN="center" 40 >Video for Linux Two API Specification: Revision 0.24</TH 41 ></TR 42 ><TR 43 ><TD 44 WIDTH="10%" 45 ALIGN="left" 46 VALIGN="bottom" 47 ><A 48 HREF="r4629.htm" 49 ACCESSKEY="P" 50 >Prev</A 51 ></TD 52 ><TD 53 WIDTH="80%" 54 ALIGN="center" 55 VALIGN="bottom" 56 ></TD 57 ><TD 58 WIDTH="10%" 59 ALIGN="right" 60 VALIGN="bottom" 61 ><A 62 HREF="r5016.htm" 63 ACCESSKEY="N" 64 >Next</A 65 ></TD 66 ></TR 67 ></TABLE 68 ><HR 69 ALIGN="LEFT" 70 WIDTH="100%"></DIV 71 ><H1 72 ><A 73 NAME="AEN4850" 74 ></A 75 >V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</H1 76 ><DIV 77 CLASS="REFNAMEDIV" 78 ><A 79 NAME="AEN4854" 80 ></A 81 ><H2 82 >Name</H2 83 ><CODE 84 CLASS="CONSTANT" 85 >V4L2_PIX_FMT_YVU420</CODE 86 >, <CODE 87 CLASS="CONSTANT" 88 >V4L2_PIX_FMT_YUV420</CODE 89 > -- Planar formats with ½ horizontal and 90 vertical chroma resolution, also known as YUV 4:2:0</DIV 91 ><DIV 92 CLASS="REFSECT1" 93 ><A 94 NAME="AEN4860" 95 ></A 96 ><H2 97 >Description</H2 98 ><P 99 >These are planar formats, as opposed to a packed format. 100 The three components are separated into three sub- images or planes. 101 The Y plane is first. The Y plane has one byte per pixel. For 102 <CODE 103 CLASS="CONSTANT" 104 >V4L2_PIX_FMT_YVU420</CODE 105 >, the Cr plane immediately 106 follows the Y plane in memory. The Cr plane is half the width and half 107 the height of the Y plane (and of the image). Each Cr belongs to four 108 pixels, a two-by-two square of the image. For example, 109 Cr<SUB 110 >0</SUB 111 > belongs to Y'<SUB 112 >00</SUB 113 >, 114 Y'<SUB 115 >01</SUB 116 >, Y'<SUB 117 >10</SUB 118 >, and 119 Y'<SUB 120 >11</SUB 121 >. Following the Cr plane is the Cb plane, 122 just like the Cr plane. <CODE 123 CLASS="CONSTANT" 124 >V4L2_PIX_FMT_YUV420</CODE 125 > is 126 the same except the Cb plane comes first, then the Cr plane.</P 127 ><P 128 >If the Y plane has pad bytes after each row, then the Cr 129 and Cb planes have half as many pad bytes after their rows. In other 130 words, two Cx rows (including padding) is exactly as long as one Y row 131 (including padding).</P 132 ><DIV 133 CLASS="EXAMPLE" 134 ><A 135 NAME="AEN4871" 136 ></A 137 ><P 138 ><B 139 >Example 2-1. <CODE 140 CLASS="CONSTANT" 141 >V4L2_PIX_FMT_YVU420</CODE 142 > 4 × 4 143 pixel image</B 144 ></P 145 ><DIV 146 CLASS="FORMALPARA" 147 ><P 148 ><B 149 >Byte Order. </B 150 >Each cell is one byte. 151 <DIV 152 CLASS="INFORMALTABLE" 153 ><P 154 ></P 155 ><A 156 NAME="AEN4877" 157 ></A 158 ><TABLE 159 BORDER="0" 160 FRAME="void" 161 CLASS="CALSTABLE" 162 ><COL 163 WIDTH="2*" 164 ALIGN="LEFT"><COL><COL><COL><COL><TBODY 165 VALIGN="TOP" 166 ><TR 167 ><TD 168 >start + 0:</TD 169 ><TD 170 >Y'<SUB 171 >00</SUB 172 ></TD 173 ><TD 174 >Y'<SUB 175 >01</SUB 176 ></TD 177 ><TD 178 >Y'<SUB 179 >02</SUB 180 ></TD 181 ><TD 182 >Y'<SUB 183 >03</SUB 184 ></TD 185 ></TR 186 ><TR 187 ><TD 188 >start + 4:</TD 189 ><TD 190 >Y'<SUB 191 >10</SUB 192 ></TD 193 ><TD 194 >Y'<SUB 195 >11</SUB 196 ></TD 197 ><TD 198 >Y'<SUB 199 >12</SUB 200 ></TD 201 ><TD 202 >Y'<SUB 203 >13</SUB 204 ></TD 205 ></TR 206 ><TR 207 ><TD 208 >start + 8:</TD 209 ><TD 210 >Y'<SUB 211 >20</SUB 212 ></TD 213 ><TD 214 >Y'<SUB 215 >21</SUB 216 ></TD 217 ><TD 218 >Y'<SUB 219 >22</SUB 220 ></TD 221 ><TD 222 >Y'<SUB 223 >23</SUB 224 ></TD 225 ></TR 226 ><TR 227 ><TD 228 >start + 12:</TD 229 ><TD 230 >Y'<SUB 231 >30</SUB 232 ></TD 233 ><TD 234 >Y'<SUB 235 >31</SUB 236 ></TD 237 ><TD 238 >Y'<SUB 239 >32</SUB 240 ></TD 241 ><TD 242 >Y'<SUB 243 >33</SUB 244 ></TD 245 ></TR 246 ><TR 247 ><TD 248 >start + 16:</TD 249 ><TD 250 >Cr<SUB 251 >00</SUB 252 ></TD 253 ><TD 254 >Cr<SUB 255 >01</SUB 256 ></TD 257 ><TD 258 > </TD 259 ><TD 260 > </TD 261 ></TR 262 ><TR 263 ><TD 264 >start + 18:</TD 265 ><TD 266 >Cr<SUB 267 >10</SUB 268 ></TD 269 ><TD 270 >Cr<SUB 271 >11</SUB 272 ></TD 273 ><TD 274 > </TD 275 ><TD 276 > </TD 277 ></TR 278 ><TR 279 ><TD 280 >start + 20:</TD 281 ><TD 282 >Cb<SUB 283 >00</SUB 284 ></TD 285 ><TD 286 >Cb<SUB 287 >01</SUB 288 ></TD 289 ><TD 290 > </TD 291 ><TD 292 > </TD 293 ></TR 294 ><TR 295 ><TD 296 >start + 22:</TD 297 ><TD 298 >Cb<SUB 299 >10</SUB 300 ></TD 301 ><TD 302 >Cb<SUB 303 >11</SUB 304 ></TD 305 ><TD 306 > </TD 307 ><TD 308 > </TD 309 ></TR 310 ></TBODY 311 ></TABLE 312 ><P 313 ></P 314 ></DIV 315 > 316 </P 317 ></DIV 318 ><DIV 319 CLASS="FORMALPARA" 320 ><P 321 ><B 322 >Color Sample Location. </B 323 > <DIV 324 CLASS="INFORMALTABLE" 325 ><P 326 ></P 327 ><A 328 NAME="AEN4948" 329 ></A 330 ><TABLE 331 BORDER="0" 332 FRAME="void" 333 CLASS="CALSTABLE" 334 ><COL><COL><COL><COL><COL><COL><COL><TBODY 335 VALIGN="TOP" 336 ><TR 337 ><TD 338 > </TD 339 ><TD 340 >0</TD 341 ><TD 342 > </TD 343 ><TD 344 >1</TD 345 ><TD 346 > </TD 347 ><TD 348 >2</TD 349 ><TD 350 > </TD 351 ><TD 352 >3</TD 353 ></TR 354 ><TR 355 ><TD 356 >0</TD 357 ><TD 358 >Y</TD 359 ><TD 360 > </TD 361 ><TD 362 >Y</TD 363 ><TD 364 > </TD 365 ><TD 366 >Y</TD 367 ><TD 368 > </TD 369 ><TD 370 >Y</TD 371 ></TR 372 ><TR 373 ><TD 374 > </TD 375 ><TD 376 > </TD 377 ><TD 378 >C</TD 379 ><TD 380 > </TD 381 ><TD 382 > </TD 383 ><TD 384 > </TD 385 ><TD 386 >C</TD 387 ><TD 388 > </TD 389 ></TR 390 ><TR 391 ><TD 392 >1</TD 393 ><TD 394 >Y</TD 395 ><TD 396 > </TD 397 ><TD 398 >Y</TD 399 ><TD 400 > </TD 401 ><TD 402 >Y</TD 403 ><TD 404 > </TD 405 ><TD 406 >Y</TD 407 ></TR 408 ><TR 409 ><TD 410 > </TD 411 ><TD 412 > </TD 413 ><TD 414 > </TD 415 ><TD 416 > </TD 417 ><TD 418 > </TD 419 ><TD 420 > </TD 421 ><TD 422 > </TD 423 ></TR 424 ><TR 425 ><TD 426 >2</TD 427 ><TD 428 >Y</TD 429 ><TD 430 > </TD 431 ><TD 432 >Y</TD 433 ><TD 434 > </TD 435 ><TD 436 >Y</TD 437 ><TD 438 > </TD 439 ><TD 440 >Y</TD 441 ></TR 442 ><TR 443 ><TD 444 > </TD 445 ><TD 446 > </TD 447 ><TD 448 >C</TD 449 ><TD 450 > </TD 451 ><TD 452 > </TD 453 ><TD 454 > </TD 455 ><TD 456 >C</TD 457 ><TD 458 > </TD 459 ></TR 460 ><TR 461 ><TD 462 >3</TD 463 ><TD 464 >Y</TD 465 ><TD 466 > </TD 467 ><TD 468 >Y</TD 469 ><TD 470 > </TD 471 ><TD 472 >Y</TD 473 ><TD 474 > </TD 475 ><TD 476 >Y</TD 477 ></TR 478 ></TBODY 479 ></TABLE 480 ><P 481 ></P 482 ></DIV 483 > 484 </P 485 ></DIV 486 ></DIV 487 ></DIV 488 ><DIV 489 CLASS="NAVFOOTER" 490 ><HR 491 ALIGN="LEFT" 492 WIDTH="100%"><TABLE 493 SUMMARY="Footer navigation table" 494 WIDTH="100%" 495 BORDER="0" 496 CELLPADDING="0" 497 CELLSPACING="0" 498 ><TR 499 ><TD 500 WIDTH="33%" 501 ALIGN="left" 502 VALIGN="top" 503 ><A 504 HREF="r4629.htm" 505 ACCESSKEY="P" 506 >Prev</A 507 ></TD 508 ><TD 509 WIDTH="34%" 510 ALIGN="center" 511 VALIGN="top" 512 ><A 513 HREF="book1.htm" 514 ACCESSKEY="H" 515 >Home</A 516 ></TD 517 ><TD 518 WIDTH="33%" 519 ALIGN="right" 520 VALIGN="top" 521 ><A 522 HREF="r5016.htm" 523 ACCESSKEY="N" 524 >Next</A 525 ></TD 526 ></TR 527 ><TR 528 ><TD 529 WIDTH="33%" 530 ALIGN="left" 531 VALIGN="top" 532 >V4L2_PIX_FMT_Y41P ('Y41P')</TD 533 ><TD 534 WIDTH="34%" 535 ALIGN="center" 536 VALIGN="top" 537 ><A 538 HREF="x3891.htm" 539 ACCESSKEY="U" 540 >Up</A 541 ></TD 542 ><TD 543 WIDTH="33%" 544 ALIGN="right" 545 VALIGN="top" 546 >V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')</TD 547 ></TR 548 ></TABLE 549 ></DIV 550 ></BODY 551 ></HTML 552 > 553
