RGB 형식 | Linux 6.18.37

요약·해설과 원문, 전문 번역을 서로 분리했습니다. API 이름, symbol, source path는 원문 표기를 사용합니다.

1. 요약·해설

원문의 핵심 논리와 kernel programming 관점의 보충 설명입니다. 아래의 전문 번역과는 별도로 작성했습니다.

요약·해설

pixfmt-rgb.rst:1-1278

Packed RGB 형식은 component bit 수, memory 순서와 alpha/padding semantic으로 구분되며 V4L2 naming은 DRM과 다른 기준을 사용합니다.

2. 영어 원문 전체

번역 기준이 된 Linux v6.18.37 원문입니다. 줄 번호는 이 버전의 파일 좌표입니다.

원문 전체 펼치기

1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later

3 .. _pixfmt-rgb:

5 ***********

6 RGB Formats

7 ***********

9 These formats encode each pixel as a triplet of RGB values. They are packed

10 formats, meaning that the RGB values for one pixel are stored consecutively in

11 memory and each pixel consumes an integer number of bytes. When the number of

12 bits required to store a pixel is not aligned to a byte boundary, the data is

13 padded with additional bits to fill the remaining byte.

15 The formats differ by the number of bits per RGB component (typically but not

16 always the same for all components), the order of components in memory, and the

17 presence of an alpha component or additional padding bits.

19 The usage and value of the alpha bits in formats that support them (named ARGB

20 or a permutation thereof, collectively referred to as alpha formats) depend on

21 the device type and hardware operation. :ref:`Capture <capture>` devices

22 (including capture queues of mem-to-mem devices) fill the alpha component in

23 memory. When the device captures an alpha channel the alpha component will have

24 a meaningful value. Otherwise, when the device doesn't capture an alpha channel

25 but can set the alpha bit to a user-configurable value, the

26 :ref:`V4L2_CID_ALPHA_COMPONENT <v4l2-alpha-component>` control is used to

27 specify that alpha value, and the alpha component of all pixels will be set to

28 the value specified by that control. Otherwise a corresponding format without

29 an alpha component (XRGB or XBGR) must be used instead of an alpha format.

31 :ref:`Output <output>` devices (including output queues of mem-to-mem devices

32 and :ref:`video output overlay <osd>` devices) read the alpha component from

33 memory. When the device processes the alpha channel the alpha component must be

34 filled with meaningful values by applications. Otherwise a corresponding format

35 without an alpha component (XRGB or XBGR) must be used instead of an alpha

36 format.

38 Formats that contain padding bits are named XRGB (or a permutation thereof).

39 The padding bits contain undefined values and must be ignored by applications,

40 devices and drivers, for both :ref:`capture` and :ref:`output` devices.

42 .. note::

44 - In all the tables that follow, bit 7 is the most significant bit in a byte.

45 - 'r', 'g' and 'b' denote bits of the red, green and blue components

46 respectively. 'a' denotes bits of the alpha component (if supported by the

47 format), and 'x' denotes padding bits.

50 Less Than 8 Bits Per Component

51 ==============================

53 These formats store an RGB triplet in one, two or four bytes. They are named

54 based on the order of the RGB components as seen in a 8-, 16- or 32-bit word,

55 which is then stored in memory in little endian byte order (unless otherwise

56 noted by the presence of bit 31 in the 4CC value), and on the number of bits

57 for each component. For instance, the RGB565 format stores a pixel in a 16-bit

58 word [15:0] laid out at as [R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1`

59 R\ :sub:`0` G\ :sub:`5` G\ :sub:`4` G\ :sub:`3` G\ :sub:`2` G\ :sub:`1`

60 G\ :sub:`0` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` B\ :sub:`1` B\ :sub:`0`], and

61 stored in memory in two bytes, [R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1`

62 R\ :sub:`0` G\ :sub:`5` G\ :sub:`4` G\ :sub:`3`] followed by [G\ :sub:`2`

63 G\ :sub:`1` G\ :sub:`0` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` B\ :sub:`1`

64 B\ :sub:`0`].

66 .. raw:: latex

68 \begingroup

69 \tiny

70 \setlength{\tabcolsep}{2pt}

.. tabularcolumns:: |p{2.8cm}|p{2.0cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|

75 .. flat-table:: RGB Formats With Less Than 8 Bits Per Component

76 :header-rows: 2

77 :stub-columns: 0

79 * - Identifier

80 - Code

81 - :cspan:`7` Byte 0 in memory

82 - :cspan:`7` Byte 1

83 - :cspan:`7` Byte 2

84 - :cspan:`7` Byte 3

85 * -

86 -

87 - 7

88 - 6

89 - 5

90 - 4

91 - 3

92 - 2

93 - 1

94 - 0

96 - 7

97 - 6

98 - 5

99 - 4

100 - 3

101 - 2

102 - 1

103 - 0

104

105 - 7

106 - 6

107 - 5

108 - 4

109 - 3

110 - 2

111 - 1

112 - 0

113

114 - 7

115 - 6

116 - 5

117 - 4

118 - 3

119 - 2

120 - 1

121 - 0

122 * .. _V4L2-PIX-FMT-RGB332:

123

124 - ``V4L2_PIX_FMT_RGB332``

125 - 'RGB1'

126

127 - r\ :sub:`2`

128 - r\ :sub:`1`

129 - r\ :sub:`0`

130 - g\ :sub:`2`

131 - g\ :sub:`1`

132 - g\ :sub:`0`

133 - b\ :sub:`1`

134 - b\ :sub:`0`

135 -

136 * .. _V4L2-PIX-FMT-ARGB444:

137

138 - ``V4L2_PIX_FMT_ARGB444``

139 - 'AR12'

140

141 - g\ :sub:`3`

142 - g\ :sub:`2`

143 - g\ :sub:`1`

144 - g\ :sub:`0`

145 - b\ :sub:`3`

146 - b\ :sub:`2`

147 - b\ :sub:`1`

148 - b\ :sub:`0`

149

150 - a\ :sub:`3`

151 - a\ :sub:`2`

152 - a\ :sub:`1`

153 - a\ :sub:`0`

154 - r\ :sub:`3`

155 - r\ :sub:`2`

156 - r\ :sub:`1`

157 - r\ :sub:`0`

158 -

159 * .. _V4L2-PIX-FMT-XRGB444:

160

161 - ``V4L2_PIX_FMT_XRGB444``

162 - 'XR12'

163

164 - g\ :sub:`3`

165 - g\ :sub:`2`

166 - g\ :sub:`1`

167 - g\ :sub:`0`

168 - b\ :sub:`3`

169 - b\ :sub:`2`

170 - b\ :sub:`1`

171 - b\ :sub:`0`

172

173 - x

174 - x

175 - x

176 - x

177 - r\ :sub:`3`

178 - r\ :sub:`2`

179 - r\ :sub:`1`

180 - r\ :sub:`0`

181 -

182 * .. _V4L2-PIX-FMT-RGBA444:

183

184 - ``V4L2_PIX_FMT_RGBA444``

185 - 'RA12'

186

187 - b\ :sub:`3`

188 - b\ :sub:`2`

189 - b\ :sub:`1`

190 - b\ :sub:`0`

191 - a\ :sub:`3`

192 - a\ :sub:`2`

193 - a\ :sub:`1`

194 - a\ :sub:`0`

195

196 - r\ :sub:`3`

197 - r\ :sub:`2`

198 - r\ :sub:`1`

199 - r\ :sub:`0`

200 - g\ :sub:`3`

201 - g\ :sub:`2`

202 - g\ :sub:`1`

203 - g\ :sub:`0`

204 -

205 * .. _V4L2-PIX-FMT-RGBX444:

206

207 - ``V4L2_PIX_FMT_RGBX444``

208 - 'RX12'

209

210 - b\ :sub:`3`

211 - b\ :sub:`2`

212 - b\ :sub:`1`

213 - b\ :sub:`0`

214 - x

215 - x

216 - x

217 - x

218

219 - r\ :sub:`3`

220 - r\ :sub:`2`

221 - r\ :sub:`1`

222 - r\ :sub:`0`

223 - g\ :sub:`3`

224 - g\ :sub:`2`

225 - g\ :sub:`1`

226 - g\ :sub:`0`

227 -

228 * .. _V4L2-PIX-FMT-ABGR444:

229

230 - ``V4L2_PIX_FMT_ABGR444``

231 - 'AB12'

232

233 - g\ :sub:`3`

234 - g\ :sub:`2`

235 - g\ :sub:`1`

236 - g\ :sub:`0`

237 - r\ :sub:`3`

238 - r\ :sub:`2`

239 - r\ :sub:`1`

240 - r\ :sub:`0`

241

242 - a\ :sub:`3`

243 - a\ :sub:`2`

244 - a\ :sub:`1`

245 - a\ :sub:`0`

246 - b\ :sub:`3`

247 - b\ :sub:`2`

248 - b\ :sub:`1`

249 - b\ :sub:`0`

250 -

251 * .. _V4L2-PIX-FMT-XBGR444:

252

253 - ``V4L2_PIX_FMT_XBGR444``

254 - 'XB12'

255

256 - g\ :sub:`3`

257 - g\ :sub:`2`

258 - g\ :sub:`1`

259 - g\ :sub:`0`

260 - r\ :sub:`3`

261 - r\ :sub:`2`

262 - r\ :sub:`1`

263 - r\ :sub:`0`

264

265 - x

266 - x

267 - x

268 - x

269 - b\ :sub:`3`

270 - b\ :sub:`2`

271 - b\ :sub:`1`

272 - b\ :sub:`0`

273 -

274 * .. _V4L2-PIX-FMT-BGRA444:

275

276 - ``V4L2_PIX_FMT_BGRA444``

277 - 'BA12'

278

279 - r\ :sub:`3`

280 - r\ :sub:`2`

281 - r\ :sub:`1`

282 - r\ :sub:`0`

283 - a\ :sub:`3`

284 - a\ :sub:`2`

285 - a\ :sub:`1`

286 - a\ :sub:`0`

287

288 - b\ :sub:`3`

289 - b\ :sub:`2`

290 - b\ :sub:`1`

291 - b\ :sub:`0`

292 - g\ :sub:`3`

293 - g\ :sub:`2`

294 - g\ :sub:`1`

295 - g\ :sub:`0`

296 -

297 * .. _V4L2-PIX-FMT-BGRX444:

298

299 - ``V4L2_PIX_FMT_BGRX444``

300 - 'BX12'

301

302 - r\ :sub:`3`

303 - r\ :sub:`2`

304 - r\ :sub:`1`

305 - r\ :sub:`0`

306 - x

307 - x

308 - x

309 - x

310

311 - b\ :sub:`3`

312 - b\ :sub:`2`

313 - b\ :sub:`1`

314 - b\ :sub:`0`

315 - g\ :sub:`3`

316 - g\ :sub:`2`

317 - g\ :sub:`1`

318 - g\ :sub:`0`

319 -

320 * .. _V4L2-PIX-FMT-ARGB555:

321

322 - ``V4L2_PIX_FMT_ARGB555``

323 - 'AR15'

324

325 - g\ :sub:`2`

326 - g\ :sub:`1`

327 - g\ :sub:`0`

328 - b\ :sub:`4`

329 - b\ :sub:`3`

330 - b\ :sub:`2`

331 - b\ :sub:`1`

332 - b\ :sub:`0`

333

334 - a

335 - r\ :sub:`4`

336 - r\ :sub:`3`

337 - r\ :sub:`2`

338 - r\ :sub:`1`

339 - r\ :sub:`0`

340 - g\ :sub:`4`

341 - g\ :sub:`3`

342 -

343 * .. _V4L2-PIX-FMT-XRGB555:

344

345 - ``V4L2_PIX_FMT_XRGB555``

346 - 'XR15'

347

348 - g\ :sub:`2`

349 - g\ :sub:`1`

350 - g\ :sub:`0`

351 - b\ :sub:`4`

352 - b\ :sub:`3`

353 - b\ :sub:`2`

354 - b\ :sub:`1`

355 - b\ :sub:`0`

356

357 - x

358 - r\ :sub:`4`

359 - r\ :sub:`3`

360 - r\ :sub:`2`

361 - r\ :sub:`1`

362 - r\ :sub:`0`

363 - g\ :sub:`4`

364 - g\ :sub:`3`

365 -

366 * .. _V4L2-PIX-FMT-RGBA555:

367

368 - ``V4L2_PIX_FMT_RGBA555``

369 - 'RA15'

370

371 - g\ :sub:`1`

372 - g\ :sub:`0`

373 - b\ :sub:`4`

374 - b\ :sub:`3`

375 - b\ :sub:`2`

376 - b\ :sub:`1`

377 - b\ :sub:`0`

378 - a

379

380 - r\ :sub:`4`

381 - r\ :sub:`3`

382 - r\ :sub:`2`

383 - r\ :sub:`1`

384 - r\ :sub:`0`

385 - g\ :sub:`4`

386 - g\ :sub:`3`

387 - g\ :sub:`2`

388 -

389 * .. _V4L2-PIX-FMT-RGBX555:

390

391 - ``V4L2_PIX_FMT_RGBX555``

392 - 'RX15'

393

394 - g\ :sub:`1`

395 - g\ :sub:`0`

396 - b\ :sub:`4`

397 - b\ :sub:`3`

398 - b\ :sub:`2`

399 - b\ :sub:`1`

400 - b\ :sub:`0`

401 - x

402

403 - r\ :sub:`4`

404 - r\ :sub:`3`

405 - r\ :sub:`2`

406 - r\ :sub:`1`

407 - r\ :sub:`0`

408 - g\ :sub:`4`

409 - g\ :sub:`3`

410 - g\ :sub:`2`

411 -

412 * .. _V4L2-PIX-FMT-ABGR555:

413

414 - ``V4L2_PIX_FMT_ABGR555``

415 - 'AB15'

416

417 - g\ :sub:`2`

418 - g\ :sub:`1`

419 - g\ :sub:`0`

420 - r\ :sub:`4`

421 - r\ :sub:`3`

422 - r\ :sub:`2`

423 - r\ :sub:`1`

424 - r\ :sub:`0`

425

426 - a

427 - b\ :sub:`4`

428 - b\ :sub:`3`

429 - b\ :sub:`2`

430 - b\ :sub:`1`

431 - b\ :sub:`0`

432 - g\ :sub:`4`

433 - g\ :sub:`3`

434 -

435 * .. _V4L2-PIX-FMT-XBGR555:

436

437 - ``V4L2_PIX_FMT_XBGR555``

438 - 'XB15'

439

440 - g\ :sub:`2`

441 - g\ :sub:`1`

442 - g\ :sub:`0`

443 - r\ :sub:`4`

444 - r\ :sub:`3`

445 - r\ :sub:`2`

446 - r\ :sub:`1`

447 - r\ :sub:`0`

448

449 - x

450 - b\ :sub:`4`

451 - b\ :sub:`3`

452 - b\ :sub:`2`

453 - b\ :sub:`1`

454 - b\ :sub:`0`

455 - g\ :sub:`4`

456 - g\ :sub:`3`

457 -

458 * .. _V4L2-PIX-FMT-BGRA555:

459

460 - ``V4L2_PIX_FMT_BGRA555``

461 - 'BA15'

462

463 - g\ :sub:`1`

464 - g\ :sub:`0`

465 - r\ :sub:`4`

466 - r\ :sub:`3`

467 - r\ :sub:`2`

468 - r\ :sub:`1`

469 - r\ :sub:`0`

470 - a

471

472 - b\ :sub:`4`

473 - b\ :sub:`3`

474 - b\ :sub:`2`

475 - b\ :sub:`1`

476 - b\ :sub:`0`

477 - g\ :sub:`4`

478 - g\ :sub:`3`

479 - g\ :sub:`2`

480 -

481 * .. _V4L2-PIX-FMT-BGRX555:

482

483 - ``V4L2_PIX_FMT_BGRX555``

484 - 'BX15'

485

486 - g\ :sub:`1`

487 - g\ :sub:`0`

488 - r\ :sub:`4`

489 - r\ :sub:`3`

490 - r\ :sub:`2`

491 - r\ :sub:`1`

492 - r\ :sub:`0`

493 - x

494

495 - b\ :sub:`4`

496 - b\ :sub:`3`

497 - b\ :sub:`2`

498 - b\ :sub:`1`

499 - b\ :sub:`0`

500 - g\ :sub:`4`

501 - g\ :sub:`3`

502 - g\ :sub:`2`

503 -

504 * .. _V4L2-PIX-FMT-RGB565:

505

506 - ``V4L2_PIX_FMT_RGB565``

507 - 'RGBP'

508

509 - g\ :sub:`2`

510 - g\ :sub:`1`

511 - g\ :sub:`0`

512 - b\ :sub:`4`

513 - b\ :sub:`3`

514 - b\ :sub:`2`

515 - b\ :sub:`1`

516 - b\ :sub:`0`

517

518 - r\ :sub:`4`

519 - r\ :sub:`3`

520 - r\ :sub:`2`

521 - r\ :sub:`1`

522 - r\ :sub:`0`

523 - g\ :sub:`5`

524 - g\ :sub:`4`

525 - g\ :sub:`3`

526 -

527 * .. _V4L2-PIX-FMT-ARGB555X:

528

529 - ``V4L2_PIX_FMT_ARGB555X``

530 - 'AR15' | (1 << 31)

531

532 - a

533 - r\ :sub:`4`

534 - r\ :sub:`3`

535 - r\ :sub:`2`

536 - r\ :sub:`1`

537 - r\ :sub:`0`

538 - g\ :sub:`4`

539 - g\ :sub:`3`

540

541 - g\ :sub:`2`

542 - g\ :sub:`1`

543 - g\ :sub:`0`

544 - b\ :sub:`4`

545 - b\ :sub:`3`

546 - b\ :sub:`2`

547 - b\ :sub:`1`

548 - b\ :sub:`0`

549 -

550 * .. _V4L2-PIX-FMT-XRGB555X:

551

552 - ``V4L2_PIX_FMT_XRGB555X``

553 - 'XR15' | (1 << 31)

554

555 - x

556 - r\ :sub:`4`

557 - r\ :sub:`3`

558 - r\ :sub:`2`

559 - r\ :sub:`1`

560 - r\ :sub:`0`

561 - g\ :sub:`4`

562 - g\ :sub:`3`

563

564 - g\ :sub:`2`

565 - g\ :sub:`1`

566 - g\ :sub:`0`

567 - b\ :sub:`4`

568 - b\ :sub:`3`

569 - b\ :sub:`2`

570 - b\ :sub:`1`

571 - b\ :sub:`0`

572 -

573 * .. _V4L2-PIX-FMT-RGB565X:

574

575 - ``V4L2_PIX_FMT_RGB565X``

576 - 'RGBR'

577

578 - r\ :sub:`4`

579 - r\ :sub:`3`

580 - r\ :sub:`2`

581 - r\ :sub:`1`

582 - r\ :sub:`0`

583 - g\ :sub:`5`

584 - g\ :sub:`4`

585 - g\ :sub:`3`

586

587 - g\ :sub:`2`

588 - g\ :sub:`1`

589 - g\ :sub:`0`

590 - b\ :sub:`4`

591 - b\ :sub:`3`

592 - b\ :sub:`2`

593 - b\ :sub:`1`

594 - b\ :sub:`0`

595 -

596 * .. _V4L2-PIX-FMT-BGR666:

597

598 - ``V4L2_PIX_FMT_BGR666``

599 - 'BGRH'

600

601 - b\ :sub:`5`

602 - b\ :sub:`4`

603 - b\ :sub:`3`

604 - b\ :sub:`2`

605 - b\ :sub:`1`

606 - b\ :sub:`0`

607 - g\ :sub:`5`

608 - g\ :sub:`4`

609

610 - g\ :sub:`3`

611 - g\ :sub:`2`

612 - g\ :sub:`1`

613 - g\ :sub:`0`

614 - r\ :sub:`5`

615 - r\ :sub:`4`

616 - r\ :sub:`3`

617 - r\ :sub:`2`

618

619 - r\ :sub:`1`

620 - r\ :sub:`0`

621 - x

622 - x

623 - x

624 - x

625 - x

626 - x

627

628 - x

629 - x

630 - x

631 - x

632 - x

633 - x

634 - x

635 - x

636

637 .. raw:: latex

638

639 \endgroup

640

641

642 8 Bits Per Component

643 ====================

644

645 These formats store an RGB triplet in three or four bytes. They are named based

646 on the order of the RGB components as stored in memory, and on the total number

647 of bits per pixel. For instance, RGB24 format stores a pixel with [R\ :sub:`7`

648 R\ :sub:`6` R\ :sub:`5` R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1`

649 R\ :sub:`0`] in the first byte, [G\ :sub:`7` G\ :sub:`6` G\ :sub:`5` G\ :sub:`4`

650 G\ :sub:`3` G\ :sub:`2` G\ :sub:`1` G\ :sub:`0`] in the second byte and

651 [B\ :sub:`7` B\ :sub:`6` B\ :sub:`5` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2`

652 B\ :sub:`1` B\ :sub:`0`] in the third byte. This differs from the DRM format

653 nomenclature that instead use the order of components as seen in a 24- or

654 32-bit little endian word.

655

656 .. raw:: latex

657

658 \small

659

660 .. flat-table:: RGB Formats With 8 Bits Per Component

661 :header-rows: 1

662 :stub-columns: 0

663

664 * - Identifier

665 - Code

666 - Byte 0 in memory

667 - Byte 1

668 - Byte 2

669 - Byte 3

670 * .. _V4L2-PIX-FMT-BGR24:

671

672 - ``V4L2_PIX_FMT_BGR24``

673 - 'BGR3'

674

675 - B\ :sub:`7-0`

676 - G\ :sub:`7-0`

677 - R\ :sub:`7-0`

678 -

679 * .. _V4L2-PIX-FMT-RGB24:

680

681 - ``V4L2_PIX_FMT_RGB24``

682 - 'RGB3'

683

684 - R\ :sub:`7-0`

685 - G\ :sub:`7-0`

686 - B\ :sub:`7-0`

687 -

688 * .. _V4L2-PIX-FMT-ABGR32:

689

690 - ``V4L2_PIX_FMT_ABGR32``

691 - 'AR24'

692

693 - B\ :sub:`7-0`

694 - G\ :sub:`7-0`

695 - R\ :sub:`7-0`

696 - A\ :sub:`7-0`

697 * .. _V4L2-PIX-FMT-XBGR32:

698

699 - ``V4L2_PIX_FMT_XBGR32``

700 - 'XR24'

701

702 - B\ :sub:`7-0`

703 - G\ :sub:`7-0`

704 - R\ :sub:`7-0`

705 - X\ :sub:`7-0`

706 * .. _V4L2-PIX-FMT-BGRA32:

707

708 - ``V4L2_PIX_FMT_BGRA32``

709 - 'RA24'

710

711 - A\ :sub:`7-0`

712 - B\ :sub:`7-0`

713 - G\ :sub:`7-0`

714 - R\ :sub:`7-0`

715 * .. _V4L2-PIX-FMT-BGRX32:

716

717 - ``V4L2_PIX_FMT_BGRX32``

718 - 'RX24'

719

720 - X\ :sub:`7-0`

721 - B\ :sub:`7-0`

722 - G\ :sub:`7-0`

723 - R\ :sub:`7-0`

724 * .. _V4L2-PIX-FMT-RGBA32:

725

726 - ``V4L2_PIX_FMT_RGBA32``

727 - 'AB24'

728

729 - R\ :sub:`7-0`

730 - G\ :sub:`7-0`

731 - B\ :sub:`7-0`

732 - A\ :sub:`7-0`

733 * .. _V4L2-PIX-FMT-RGBX32:

734

735 - ``V4L2_PIX_FMT_RGBX32``

736 - 'XB24'

737

738 - R\ :sub:`7-0`

739 - G\ :sub:`7-0`

740 - B\ :sub:`7-0`

741 - X\ :sub:`7-0`

742 * .. _V4L2-PIX-FMT-ARGB32:

743

744 - ``V4L2_PIX_FMT_ARGB32``

745 - 'BA24'

746

747 - A\ :sub:`7-0`

748 - R\ :sub:`7-0`

749 - G\ :sub:`7-0`

750 - B\ :sub:`7-0`

751 * .. _V4L2-PIX-FMT-XRGB32:

752

753 - ``V4L2_PIX_FMT_XRGB32``

754 - 'BX24'

755

756 - X\ :sub:`7-0`

757 - R\ :sub:`7-0`

758 - G\ :sub:`7-0`

759 - B\ :sub:`7-0`

760

761 .. raw:: latex

762

763 \normalsize

764

765

766 10 Bits Per Component

767 =====================

768

769 These formats store a 30-bit RGB triplet with an optional 2 bit alpha in four

770 bytes. They are named based on the order of the RGB components as seen in a

771 32-bit word, which is then stored in memory in little endian byte order

772 (unless otherwise noted by the presence of bit 31 in the 4CC value), and on the

773 number of bits for each component.

774

775 .. raw:: latex

776

777 \begingroup

778 \tiny

779 \setlength{\tabcolsep}{2pt}

780

781

.. tabularcolumns:: |p{3.2cm}|p{0.8cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|

782

783

784 .. flat-table:: RGB Formats 10 Bits Per Color Component

785 :header-rows: 2

786 :stub-columns: 0

787

788 * - Identifier

789 - Code

790 - :cspan:`7` Byte 0 in memory

791 - :cspan:`7` Byte 1

792 - :cspan:`7` Byte 2

793 - :cspan:`7` Byte 3

794 * -

795 -

796 - 7

797 - 6

798 - 5

799 - 4

800 - 3

801 - 2

802 - 1

803 - 0

804

805 - 7

806 - 6

807 - 5

808 - 4

809 - 3

810 - 2

811 - 1

812 - 0

813

814 - 7

815 - 6

816 - 5

817 - 4

818 - 3

819 - 2

820 - 1

821 - 0

822

823 - 7

824 - 6

825 - 5

826 - 4

827 - 3

828 - 2

829 - 1

830 - 0

831 * .. _V4L2-PIX-FMT-RGBX1010102:

832

833 - ``V4L2_PIX_FMT_RGBX1010102``

834 - 'RX30'

835

836 - b\ :sub:`5`

837 - b\ :sub:`4`

838 - b\ :sub:`3`

839 - b\ :sub:`2`

840 - b\ :sub:`1`

841 - b\ :sub:`0`

842 - x

843 - x

844

845 - g\ :sub:`3`

846 - g\ :sub:`2`

847 - g\ :sub:`1`

848 - g\ :sub:`0`

849 - b\ :sub:`9`

850 - b\ :sub:`8`

851 - b\ :sub:`7`

852 - b\ :sub:`6`

853

854 - r\ :sub:`1`

855 - r\ :sub:`0`

856 - g\ :sub:`9`

857 - g\ :sub:`8`

858 - g\ :sub:`7`

859 - g\ :sub:`6`

860 - g\ :sub:`5`

861 - g\ :sub:`4`

862

863 - r\ :sub:`9`

864 - r\ :sub:`8`

865 - r\ :sub:`7`

866 - r\ :sub:`6`

867 - r\ :sub:`5`

868 - r\ :sub:`4`

869 - r\ :sub:`3`

870 - r\ :sub:`2`

871 * .. _V4L2-PIX-FMT-RGBA1010102:

872

873 - ``V4L2_PIX_FMT_RGBA1010102``

874 - 'RA30'

875

876 - b\ :sub:`5`

877 - b\ :sub:`4`

878 - b\ :sub:`3`

879 - b\ :sub:`2`

880 - b\ :sub:`1`

881 - b\ :sub:`0`

882 - a\ :sub:`1`

883 - a\ :sub:`0`

884

885 - g\ :sub:`3`

886 - g\ :sub:`2`

887 - g\ :sub:`1`

888 - g\ :sub:`0`

889 - b\ :sub:`9`

890 - b\ :sub:`8`

891 - b\ :sub:`7`

892 - b\ :sub:`6`

893

894 - r\ :sub:`1`

895 - r\ :sub:`0`

896 - g\ :sub:`9`

897 - g\ :sub:`8`

898 - g\ :sub:`7`

899 - g\ :sub:`6`

900 - g\ :sub:`5`

901 - g\ :sub:`4`

902

903 - r\ :sub:`9`

904 - r\ :sub:`8`

905 - r\ :sub:`7`

906 - r\ :sub:`6`

907 - r\ :sub:`5`

908 - r\ :sub:`4`

909 - r\ :sub:`3`

910 - r\ :sub:`2`

911 * .. _V4L2-PIX-FMT-ARGB2101010:

912

913 - ``V4L2_PIX_FMT_ARGB2101010``

914 - 'AR30'

915

916 - b\ :sub:`7`

917 - b\ :sub:`6`

918 - b\ :sub:`5`

919 - b\ :sub:`4`

920 - b\ :sub:`3`

921 - b\ :sub:`2`

922 - b\ :sub:`1`

923 - b\ :sub:`0`

924

925 - g\ :sub:`5`

926 - g\ :sub:`4`

927 - g\ :sub:`3`

928 - g\ :sub:`2`

929 - g\ :sub:`1`

930 - g\ :sub:`0`

931 - b\ :sub:`9`

932 - b\ :sub:`8`

933

934 - r\ :sub:`3`

935 - r\ :sub:`2`

936 - r\ :sub:`1`

937 - r\ :sub:`0`

938 - g\ :sub:`9`

939 - g\ :sub:`8`

940 - g\ :sub:`7`

941 - g\ :sub:`6`

942

943 - a\ :sub:`1`

944 - a\ :sub:`0`

945 - r\ :sub:`9`

946 - r\ :sub:`8`

947 - r\ :sub:`7`

948 - r\ :sub:`6`

949 - r\ :sub:`5`

950 - r\ :sub:`4`

951

952 .. raw:: latex

953

954 \endgroup

955

956 12 Bits Per Component

957 ==============================

958

959 These formats store an RGB triplet in six or eight bytes, with 12 bits per component.

960 Expand the bits per component to 16 bits, data in the high bits, zeros in the low bits,

961 arranged in little endian order.

962

963 .. raw:: latex

964

965 \small

966

967 .. flat-table:: RGB Formats With 12 Bits Per Component

968 :header-rows: 1

969

970 * - Identifier

971 - Code

972 - Byte 1-0

973 - Byte 3-2

974 - Byte 5-4

975 - Byte 7-6

976 * .. _V4L2-PIX-FMT-BGR48-12:

977

978 - ``V4L2_PIX_FMT_BGR48_12``

979 - 'B312'

980

981 - B\ :sub:`15-4`

982 - G\ :sub:`15-4`

983 - R\ :sub:`15-4`

984 -

985 * .. _V4L2-PIX-FMT-ABGR64-12:

986

987 - ``V4L2_PIX_FMT_ABGR64_12``

988 - 'B412'

989

990 - B\ :sub:`15-4`

991 - G\ :sub:`15-4`

992 - R\ :sub:`15-4`

993 - A\ :sub:`15-4`

994

995 .. raw:: latex

996

997 \normalsize

998

999 16 Bits Per Component

1000 =====================

1001

1002 These formats store an RGB triplet in six bytes, with 16 bits per component

1003 stored in memory in little endian byte order. They are named based on the order

1004 of the RGB components as stored in memory. For instance, RGB48 stores R\

1005 :sub:`7:0` and R\ :sub:`15:8` in bytes 0 and 1 respectively. This differs from

1006 the DRM format nomenclature that instead uses the order of components as seen in

1007 the 48-bits little endian word.

1008

1009 .. raw:: latex

1010

1011 \small

1012

1013 .. flat-table:: RGB Formats With 16 Bits Per Component

1014 :header-rows: 1

1015

1016 * - Identifier

1017 - Code

1018 - Byte 0

1019 - Byte 1

1020 - Byte 2

1021 - Byte 3

1022 - Byte 4

1023 - Byte 5

1024

1025 * .. _V4L2-PIX-FMT-BGR48:

1026

1027 - ``V4L2_PIX_FMT_BGR48``

1028 - 'BGR6'

1029

1030 - B\ :sub:`7-0`

1031 - B\ :sub:`15-8`

1032 - G\ :sub:`7-0`

1033 - G\ :sub:`15-8`

1034 - R\ :sub:`7-0`

1035 - R\ :sub:`15-8`

1036

1037 * .. _V4L2-PIX-FMT-RGB48:

1038

1039 - ``V4L2_PIX_FMT_RGB48``

1040 - 'RGB6'

1041

1042 - R\ :sub:`7-0`

1043 - R\ :sub:`15-8`

1044 - G\ :sub:`7-0`

1045 - G\ :sub:`15-8`

1046 - B\ :sub:`7-0`

1047 - B\ :sub:`15-8`

1048

1049 .. raw:: latex

1050

1051 \normalsize

1052

1053 Deprecated RGB Formats

1054 ======================

1055

1056 Formats defined in :ref:`pixfmt-rgb-deprecated` are deprecated and must not be

1057 used by new drivers. They are documented here for reference. The meaning of

1058 their alpha bits ``(a)`` is ill-defined and they are interpreted as in either

1059 the corresponding ARGB or XRGB format, depending on the driver.

1060

1061 .. raw:: latex

1062

1063 \begingroup

1064 \tiny

1065 \setlength{\tabcolsep}{2pt}

1066

1067

.. tabularcolumns:: |p{2.6cm}|p{0.70cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|

1068

1069 .. _pixfmt-rgb-deprecated:

1070

1071 .. flat-table:: Deprecated Packed RGB Image Formats

1072 :header-rows: 2

1073 :stub-columns: 0

1074

1075 * - Identifier

1076 - Code

1077 - :cspan:`7` Byte 0 in memory

1078

1079 - :cspan:`7` Byte 1

1080

1081 - :cspan:`7` Byte 2

1082

1083 - :cspan:`7` Byte 3

1084 * -

1085 -

1086 - 7

1087 - 6

1088 - 5

1089 - 4

1090 - 3

1091 - 2

1092 - 1

1093 - 0

1094

1095 - 7

1096 - 6

1097 - 5

1098 - 4

1099 - 3

1100 - 2

1101 - 1

1102 - 0

1103

1104 - 7

1105 - 6

1106 - 5

1107 - 4

1108 - 3

1109 - 2

1110 - 1

1111 - 0

1112

1113 - 7

1114 - 6

1115 - 5

1116 - 4

1117 - 3

1118 - 2

1119 - 1

1120 - 0

1121 * .. _V4L2-PIX-FMT-RGB444:

1122

1123 - ``V4L2_PIX_FMT_RGB444``

1124 - 'R444'

1125

1126 - g\ :sub:`3`

1127 - g\ :sub:`2`

1128 - g\ :sub:`1`

1129 - g\ :sub:`0`

1130 - b\ :sub:`3`

1131 - b\ :sub:`2`

1132 - b\ :sub:`1`

1133 - b\ :sub:`0`

1134

1135 - a\ :sub:`3`

1136 - a\ :sub:`2`

1137 - a\ :sub:`1`

1138 - a\ :sub:`0`

1139 - r\ :sub:`3`

1140 - r\ :sub:`2`

1141 - r\ :sub:`1`

1142 - r\ :sub:`0`

1143 -

1144 * .. _V4L2-PIX-FMT-RGB555:

1145

1146 - ``V4L2_PIX_FMT_RGB555``

1147 - 'RGBO'

1148

1149 - g\ :sub:`2`

1150 - g\ :sub:`1`

1151 - g\ :sub:`0`

1152 - b\ :sub:`4`

1153 - b\ :sub:`3`

1154 - b\ :sub:`2`

1155 - b\ :sub:`1`

1156 - b\ :sub:`0`

1157

1158 - a

1159 - r\ :sub:`4`

1160 - r\ :sub:`3`

1161 - r\ :sub:`2`

1162 - r\ :sub:`1`

1163 - r\ :sub:`0`

1164 - g\ :sub:`4`

1165 - g\ :sub:`3`

1166 -

1167 * .. _V4L2-PIX-FMT-RGB555X:

1168

1169 - ``V4L2_PIX_FMT_RGB555X``

1170 - 'RGBQ'

1171

1172 - a

1173 - r\ :sub:`4`

1174 - r\ :sub:`3`

1175 - r\ :sub:`2`

1176 - r\ :sub:`1`

1177 - r\ :sub:`0`

1178 - g\ :sub:`4`

1179 - g\ :sub:`3`

1180

1181 - g\ :sub:`2`

1182 - g\ :sub:`1`

1183 - g\ :sub:`0`

1184 - b\ :sub:`4`

1185 - b\ :sub:`3`

1186 - b\ :sub:`2`

1187 - b\ :sub:`1`

1188 - b\ :sub:`0`

1189 -

1190 * .. _V4L2-PIX-FMT-BGR32:

1191

1192 - ``V4L2_PIX_FMT_BGR32``

1193 - 'BGR4'

1194

1195 - b\ :sub:`7`

1196 - b\ :sub:`6`

1197 - b\ :sub:`5`

1198 - b\ :sub:`4`

1199 - b\ :sub:`3`

1200 - b\ :sub:`2`

1201 - b\ :sub:`1`

1202 - b\ :sub:`0`

1203

1204 - g\ :sub:`7`

1205 - g\ :sub:`6`

1206 - g\ :sub:`5`

1207 - g\ :sub:`4`

1208 - g\ :sub:`3`

1209 - g\ :sub:`2`

1210 - g\ :sub:`1`

1211 - g\ :sub:`0`

1212

1213 - r\ :sub:`7`

1214 - r\ :sub:`6`

1215 - r\ :sub:`5`

1216 - r\ :sub:`4`

1217 - r\ :sub:`3`

1218 - r\ :sub:`2`

1219 - r\ :sub:`1`

1220 - r\ :sub:`0`

1221

1222 - a\ :sub:`7`

1223 - a\ :sub:`6`

1224 - a\ :sub:`5`

1225 - a\ :sub:`4`

1226 - a\ :sub:`3`

1227 - a\ :sub:`2`

1228 - a\ :sub:`1`

1229 - a\ :sub:`0`

1230 * .. _V4L2-PIX-FMT-RGB32:

1231

1232 - ``V4L2_PIX_FMT_RGB32``

1233 - 'RGB4'

1234

1235 - a\ :sub:`7`

1236 - a\ :sub:`6`

1237 - a\ :sub:`5`

1238 - a\ :sub:`4`

1239 - a\ :sub:`3`

1240 - a\ :sub:`2`

1241 - a\ :sub:`1`

1242 - a\ :sub:`0`

1243

1244 - r\ :sub:`7`

1245 - r\ :sub:`6`

1246 - r\ :sub:`5`

1247 - r\ :sub:`4`

1248 - r\ :sub:`3`

1249 - r\ :sub:`2`

1250 - r\ :sub:`1`

1251 - r\ :sub:`0`

1252

1253 - g\ :sub:`7`

1254 - g\ :sub:`6`

1255 - g\ :sub:`5`

1256 - g\ :sub:`4`

1257 - g\ :sub:`3`

1258 - g\ :sub:`2`

1259 - g\ :sub:`1`

1260 - g\ :sub:`0`

1261

1262 - b\ :sub:`7`

1263 - b\ :sub:`6`

1264 - b\ :sub:`5`

1265 - b\ :sub:`4`

1266 - b\ :sub:`3`

1267 - b\ :sub:`2`

1268 - b\ :sub:`1`

1269 - b\ :sub:`0`

1270

1271 .. raw:: latex

1272

1273 \endgroup

1274

1275 A test utility to determine which RGB formats a driver actually supports

1276 is available from the LinuxTV v4l-dvb repository. See

1277 `https://linuxtv.org/repo/ <https://linuxtv.org/repo/>`__ for access

1278 instructions.

1279

3. 한국어 전문 번역

영어 원문의 문단 순서와 의미를 유지한 전체 번역입니다. 코드, 함수명, symbol과 URL은 원문 표기를 유지합니다.

Packed RGB와 alpha·padding 규칙

1-49

RGB 형식은 pixel 하나를 R, G, B 값의 triplet으로 encoding합니다. 모두 packed 형식이라 한 pixel의 component가 memory에 연속 저장되고 pixel 하나가 정수 개 byte를 차지합니다. Pixel bit 수가 byte 경계에 맞지 않으면 남는 bit를 padding으로 채웁니다.

형식은 component별 bit 수, memory에서의 component 순서, alpha component 또는 추가 padding bit의 유무로 구분됩니다. Component bit 수는 대체로 같지만 항상 같지는 않습니다.

ARGB 및 그 순열인 alpha 형식에서 alpha의 용도와 값은 device 유형과 hardware operation에 따라 달라집니다. Capture device와 mem-to-mem capture queue는 alpha를 memory에 채웁니다. 실제 alpha channel을 capture하면 값에 의미가 있고, channel은 없지만 고정 alpha를 넣을 수 있으면 `V4L2_CID_ALPHA_COMPONENT`로 모든 pixel의 alpha 값을 정합니다. 어느 쪽도 아니면 alpha 형식 대신 대응 XRGB/XBGR 형식을 사용해야 합니다.

Output device, mem-to-mem output queue와 video output overlay는 alpha를 memory에서 읽습니다. Hardware가 alpha를 처리한다면 application이 의미 있는 값을 채워야 하며, 처리하지 않는다면 역시 대응 XRGB/XBGR 형식을 사용합니다.

이름에 X가 있는 형식의 X bit는 padding입니다. 값은 undefined이므로 capture와 output 모두에서 application, device, driver가 무시해야 합니다. 뒤 표에서 bit 7은 byte의 MSB이고 r/g/b/a/x는 각각 red, green, blue, alpha, padding bit를 뜻합니다.

Alpha와 X 선택

Identifier / CodeMemory 배치

Capture가 alpha channel 제공ARGB 계열을 사용하고 capture된 alpha 값을 보존

Capture가 고정 alpha 삽입ARGB 계열과 `V4L2_CID_ALPHA_COMPONENT` 사용

Output이 alpha 처리Application이 ARGB alpha에 의미 있는 값을 기록

Alpha를 처리하지 않음대응 XRGB/XBGR 계열을 사용하고 X를 무시

Device가 alpha를 실제로 다루는지에 따라 형식을 선택합니다.

.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later

.. _pixfmt-rgb:

***********
RGB Formats
***********

These formats encode each pixel as a triplet of RGB values. They are packed
formats, meaning that the RGB values for one pixel are stored consecutively in
memory and each pixel consumes an integer number of bytes. When the number of
bits required to store a pixel is not aligned to a byte boundary, the data is
padded with additional bits to fill the remaining byte.

The formats differ by the number of bits per RGB component (typically but not
always the same for all components), the order of components in memory, and the
presence of an alpha component or additional padding bits.

The usage and value of the alpha bits in formats that support them (named ARGB
or a permutation thereof, collectively referred to as alpha formats) depend on
the device type and hardware operation. :ref:`Capture <capture>` devices
(including capture queues of mem-to-mem devices) fill the alpha component in
memory. When the device captures an alpha channel the alpha component will have
a meaningful value. Otherwise, when the device doesn't capture an alpha channel
but can set the alpha bit to a user-configurable value, the
:ref:`V4L2_CID_ALPHA_COMPONENT <v4l2-alpha-component>` control is used to
specify that alpha value, and the alpha component of all pixels will be set to
the value specified by that control. Otherwise a corresponding format without
an alpha component (XRGB or XBGR) must be used instead of an alpha format.

:ref:`Output <output>` devices (including output queues of mem-to-mem devices
and :ref:`video output overlay <osd>` devices) read the alpha component from
memory. When the device processes the alpha channel the alpha component must be
filled with meaningful values by applications. Otherwise a corresponding format
without an alpha component (XRGB or XBGR) must be used instead of an alpha
format.

Formats that contain padding bits are named XRGB (or a permutation thereof).
The padding bits contain undefined values and must be ignored by applications,
devices and drivers, for both :ref:`capture` and :ref:`output` devices.

.. note::

   - In all the tables that follow, bit 7 is the most significant bit in a byte.
   - 'r', 'g' and 'b' denote bits of the red, green and blue components
     respectively. 'a' denotes bits of the alpha component (if supported by the
     format), and 'x' denotes padding bits.

8 bpc 미만: RGB332와 4:4:4

50-319

Component당 8 bit 미만인 형식은 pixel을 1, 2 또는 4 byte에 저장합니다. 이름은 8/16/32-bit word에서 보이는 component 순서와 각 component bit 수를 기준으로 하며, word는 기본적으로 little-endian으로 memory에 저장됩니다. FourCC 값의 bit 31이 설정된 형식은 명시된 반대 byte 순서를 사용합니다.

예를 들어 RGB565의 16-bit word는 `[R4:0 G5:0 B4:0]`이고 little-endian memory에서는 낮은 byte `[G2:0 B4:0]` 다음 높은 byte `[R4:0 G5:3]`가 옵니다.

RGB332와 4:4:4 형식

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_RGB332` / `RGB1`Byte 0=`R[2:0] G[2:0] B[1:0]`

`V4L2_PIX_FMT_ARGB444` / `AR12`Byte 0=`G[3:0] B[3:0]`; Byte 1=`A[3:0] R[3:0]`

`V4L2_PIX_FMT_XRGB444` / `XR12`Byte 0=`G[3:0] B[3:0]`; Byte 1=`X[3:0] R[3:0]`

`V4L2_PIX_FMT_RGBA444` / `RA12`Byte 0=`B[3:0] A[3:0]`; Byte 1=`R[3:0] G[3:0]`

`V4L2_PIX_FMT_RGBX444` / `RX12`Byte 0=`B[3:0] X[3:0]`; Byte 1=`R[3:0] G[3:0]`

`V4L2_PIX_FMT_ABGR444` / `AB12`Byte 0=`G[3:0] R[3:0]`; Byte 1=`A[3:0] B[3:0]`

`V4L2_PIX_FMT_XBGR444` / `XB12`Byte 0=`G[3:0] R[3:0]`; Byte 1=`X[3:0] B[3:0]`

`V4L2_PIX_FMT_BGRA444` / `BA12`Byte 0=`R[3:0] A[3:0]`; Byte 1=`B[3:0] G[3:0]`

`V4L2_PIX_FMT_BGRX444` / `BX12`Byte 0=`R[3:0] X[3:0]`; Byte 1=`B[3:0] G[3:0]`

Byte 0이 낮은 주소입니다. 각 표기는 한 byte 안의 MSB→LSB 순서입니다.

16-bit 형식 이름과 memory

형식 이름에서 16-bit word component 순서 확인각 component bit 수만큼 word bit range 배정Word의 낮은 8 bit를 Byte 0으로 저장높은 8 bit를 Byte 1로 저장

이름은 word의 MSB→LSB component 순서이고 memory는 little-endian임을 구분합니다.

Less Than 8 Bits Per Component
==============================

These formats store an RGB triplet in one, two or four bytes. They are named
based on the order of the RGB components as seen in a 8-, 16- or 32-bit word,
which is then stored in memory in little endian byte order (unless otherwise
noted by the presence of bit 31 in the 4CC value), and on the number of bits
for each component. For instance, the RGB565 format stores a pixel in a 16-bit
word [15:0] laid out at as [R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1`
R\ :sub:`0` G\ :sub:`5` G\ :sub:`4` G\ :sub:`3` G\ :sub:`2` G\ :sub:`1`
G\ :sub:`0` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` B\ :sub:`1` B\ :sub:`0`], and
stored in memory in two bytes, [R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1`
R\ :sub:`0` G\ :sub:`5` G\ :sub:`4` G\ :sub:`3`] followed by [G\ :sub:`2`
G\ :sub:`1` G\ :sub:`0` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2` B\ :sub:`1`
B\ :sub:`0`].

.. raw:: latex

    \begingroup
    \tiny
    \setlength{\tabcolsep}{2pt}

.. tabularcolumns:: |p{2.8cm}|p{2.0cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|


.. flat-table:: RGB Formats With Less Than 8 Bits Per Component
    :header-rows:  2
    :stub-columns: 0

    * - Identifier
      - Code
      - :cspan:`7` Byte 0 in memory
      - :cspan:`7` Byte 1
      - :cspan:`7` Byte 2
      - :cspan:`7` Byte 3
    * -
      -
      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0
    * .. _V4L2-PIX-FMT-RGB332:

      - ``V4L2_PIX_FMT_RGB332``
      - 'RGB1'

      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-ARGB444:

      - ``V4L2_PIX_FMT_ARGB444``
      - 'AR12'

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-XRGB444:

      - ``V4L2_PIX_FMT_XRGB444``
      - 'XR12'

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - x
      - x
      - x
      - x
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-RGBA444:

      - ``V4L2_PIX_FMT_RGBA444``
      - 'RA12'

      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`

      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-RGBX444:

      - ``V4L2_PIX_FMT_RGBX444``
      - 'RX12'

      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - x
      - x
      - x
      - x

      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-ABGR444:

      - ``V4L2_PIX_FMT_ABGR444``
      - 'AB12'

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`

      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-XBGR444:

      - ``V4L2_PIX_FMT_XBGR444``
      - 'XB12'

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`

      - x
      - x
      - x
      - x
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-BGRA444:

      - ``V4L2_PIX_FMT_BGRA444``
      - 'BA12'

      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`

      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-BGRX444:

      - ``V4L2_PIX_FMT_BGRX444``
      - 'BX12'

      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - x
      - x
      - x
      - x

      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      -

8 bpc 미만: 5:5:5·5:6:5·6:6:6

320-641

1-bit alpha/padding 5:5:5 계열

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_ARGB555` / `AR15`B0=`G[2:0] B[4:0]`; B1=`A R[4:0] G[4:3]`

`V4L2_PIX_FMT_XRGB555` / `XR15`B0=`G[2:0] B[4:0]`; B1=`X R[4:0] G[4:3]`

`V4L2_PIX_FMT_RGBA555` / `RA15`B0=`G[1:0] B[4:0] A`; B1=`R[4:0] G[4:2]`

`V4L2_PIX_FMT_RGBX555` / `RX15`B0=`G[1:0] B[4:0] X`; B1=`R[4:0] G[4:2]`

`V4L2_PIX_FMT_ABGR555` / `AB15`B0=`G[2:0] R[4:0]`; B1=`A B[4:0] G[4:3]`

`V4L2_PIX_FMT_XBGR555` / `XB15`B0=`G[2:0] R[4:0]`; B1=`X B[4:0] G[4:3]`

`V4L2_PIX_FMT_BGRA555` / `BA15`B0=`G[1:0] R[4:0] A`; B1=`B[4:0] G[4:2]`

`V4L2_PIX_FMT_BGRX555` / `BX15`B0=`G[1:0] R[4:0] X`; B1=`B[4:0] G[4:2]`

A와 X만 다르고 RGB bit 배치는 쌍별로 같습니다.

5:6:5와 byte-order variant

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_RGB565` / `RGBP`B0=`G[2:0] B[4:0]`; B1=`R[4:0] G[5:3]`

`V4L2_PIX_FMT_ARGB555X` / `AR15 | (1 << 31)`B0=`A R[4:0] G[4:3]`; B1=`G[2:0] B[4:0]`

`V4L2_PIX_FMT_XRGB555X` / `XR15 | (1 << 31)`B0=`X R[4:0] G[4:3]`; B1=`G[2:0] B[4:0]`

`V4L2_PIX_FMT_RGB565X` / `RGBR`B0=`R[4:0] G[5:3]`; B1=`G[2:0] B[4:0]`

FourCC bit 31 또는 X suffix가 byte 순서를 명시하는 형식입니다.

`V4L2_PIX_FMT_BGR666` (`BGRH`)은 4 byte를 차지하지만 실제 color는 18 bit입니다. Byte 0=`B[5:0] G[5:4]`, Byte 1=`G[3:0] R[5:2]`, Byte 2=`R[1:0] X[5:0]`, Byte 3은 모두 X padding입니다.

BGR666 유효 bit

ByteMSB→LSB

Byte 0B 6 bit + G 상위 2 bit

Byte 1G 하위 4 bit + R 상위 4 bit

Byte 2R 하위 2 bit + X 6 bit

Byte 3X 8 bit

14개 X bit는 정의되지 않으므로 무시합니다.

    * .. _V4L2-PIX-FMT-ARGB555:

      - ``V4L2_PIX_FMT_ARGB555``
      - 'AR15'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - a
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -
    * .. _V4L2-PIX-FMT-XRGB555:

      - ``V4L2_PIX_FMT_XRGB555``
      - 'XR15'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - x
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -
    * .. _V4L2-PIX-FMT-RGBA555:

      - ``V4L2_PIX_FMT_RGBA555``
      - 'RA15'

      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - a

      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      -
    * .. _V4L2-PIX-FMT-RGBX555:

      - ``V4L2_PIX_FMT_RGBX555``
      - 'RX15'

      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - x

      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      -
    * .. _V4L2-PIX-FMT-ABGR555:

      - ``V4L2_PIX_FMT_ABGR555``
      - 'AB15'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`

      - a
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -
    * .. _V4L2-PIX-FMT-XBGR555:

      - ``V4L2_PIX_FMT_XBGR555``
      - 'XB15'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`

      - x
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -
    * .. _V4L2-PIX-FMT-BGRA555:

      - ``V4L2_PIX_FMT_BGRA555``
      - 'BA15'

      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - a

      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      -
    * .. _V4L2-PIX-FMT-BGRX555:

      - ``V4L2_PIX_FMT_BGRX555``
      - 'BX15'

      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - x

      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      -
    * .. _V4L2-PIX-FMT-RGB565:

      - ``V4L2_PIX_FMT_RGB565``
      - 'RGBP'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`5`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -
    * .. _V4L2-PIX-FMT-ARGB555X:

      - ``V4L2_PIX_FMT_ARGB555X``
      - 'AR15' | (1 << 31)

      - a
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-XRGB555X:

      - ``V4L2_PIX_FMT_XRGB555X``
      - 'XR15' | (1 << 31)

      - x
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-RGB565X:

      - ``V4L2_PIX_FMT_RGB565X``
      - 'RGBR'

      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`5`
      - g\ :sub:`4`
      - g\ :sub:`3`

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-BGR666:

      - ``V4L2_PIX_FMT_BGR666``
      - 'BGRH'

      - b\ :sub:`5`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - g\ :sub:`5`
      - g\ :sub:`4`

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - r\ :sub:`5`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`

      - r\ :sub:`1`
      - r\ :sub:`0`
      - x
      - x
      - x
      - x
      - x
      - x

      - x
      - x
      - x
      - x
      - x
      - x
      - x
      - x

.. raw:: latex

    \endgroup

Component당 8 bit

642-765

8-bpc 형식은 RGB triplet을 3 byte 또는 alpha/padding을 포함해 4 byte에 저장합니다. 이름은 실제 memory의 component 순서와 pixel당 총 bit 수를 기준으로 합니다. RGB24는 Byte 0=R, Byte 1=G, Byte 2=B입니다. 이는 24/32-bit little-endian word에서 보이는 component 순서를 이름에 쓰는 DRM naming과 다릅니다.

RGB 8-bpc memory byte 순서

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_BGR24` / `BGR3`B, G, R

`V4L2_PIX_FMT_RGB24` / `RGB3`R, G, B

`V4L2_PIX_FMT_ABGR32` / `AR24`B, G, R, A

`V4L2_PIX_FMT_XBGR32` / `XR24`B, G, R, X

`V4L2_PIX_FMT_BGRA32` / `RA24`A, B, G, R

`V4L2_PIX_FMT_BGRX32` / `RX24`X, B, G, R

`V4L2_PIX_FMT_RGBA32` / `AB24`R, G, B, A

`V4L2_PIX_FMT_RGBX32` / `XB24`R, G, B, X

`V4L2_PIX_FMT_ARGB32` / `BA24`A, R, G, B

`V4L2_PIX_FMT_XRGB32` / `BX24`X, R, G, B

A는 alpha, X는 undefined padding입니다.

V4L2와 DRM naming

Identifier / CodeMemory 배치

V4L2Memory Byte 0부터 component 순서를 이름에 반영

DRMLittle-endian 24/32-bit word의 MSB→LSB component 순서를 이름에 반영

같은 byte sequence를 이름으로 읽을 때 기준이 다릅니다.

8 Bits Per Component
====================

These formats store an RGB triplet in three or four bytes. They are named based
on the order of the RGB components as stored in memory, and on the total number
of bits per pixel. For instance, RGB24 format stores a pixel with [R\ :sub:`7`
R\ :sub:`6` R\ :sub:`5` R\ :sub:`4` R\ :sub:`3` R\ :sub:`2` R\ :sub:`1`
R\ :sub:`0`] in the first byte, [G\ :sub:`7` G\ :sub:`6` G\ :sub:`5` G\ :sub:`4`
G\ :sub:`3` G\ :sub:`2` G\ :sub:`1` G\ :sub:`0`] in the second byte and
[B\ :sub:`7` B\ :sub:`6` B\ :sub:`5` B\ :sub:`4` B\ :sub:`3` B\ :sub:`2`
B\ :sub:`1` B\ :sub:`0`] in the third byte. This differs from the DRM format
nomenclature that instead use the order of components as seen in a 24- or
32-bit little endian word.

.. raw:: latex

    \small

.. flat-table:: RGB Formats With 8 Bits Per Component
    :header-rows:  1
    :stub-columns: 0

    * - Identifier
      - Code
      - Byte 0 in memory
      - Byte 1
      - Byte 2
      - Byte 3
    * .. _V4L2-PIX-FMT-BGR24:

      - ``V4L2_PIX_FMT_BGR24``
      - 'BGR3'

      - B\ :sub:`7-0`
      - G\ :sub:`7-0`
      - R\ :sub:`7-0`
      -
    * .. _V4L2-PIX-FMT-RGB24:

      - ``V4L2_PIX_FMT_RGB24``
      - 'RGB3'

      - R\ :sub:`7-0`
      - G\ :sub:`7-0`
      - B\ :sub:`7-0`
      -
    * .. _V4L2-PIX-FMT-ABGR32:

      - ``V4L2_PIX_FMT_ABGR32``
      - 'AR24'

      - B\ :sub:`7-0`
      - G\ :sub:`7-0`
      - R\ :sub:`7-0`
      - A\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-XBGR32:

      - ``V4L2_PIX_FMT_XBGR32``
      - 'XR24'

      - B\ :sub:`7-0`
      - G\ :sub:`7-0`
      - R\ :sub:`7-0`
      - X\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-BGRA32:

      - ``V4L2_PIX_FMT_BGRA32``
      - 'RA24'

      - A\ :sub:`7-0`
      - B\ :sub:`7-0`
      - G\ :sub:`7-0`
      - R\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-BGRX32:

      - ``V4L2_PIX_FMT_BGRX32``
      - 'RX24'

      - X\ :sub:`7-0`
      - B\ :sub:`7-0`
      - G\ :sub:`7-0`
      - R\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-RGBA32:

      - ``V4L2_PIX_FMT_RGBA32``
      - 'AB24'

      - R\ :sub:`7-0`
      - G\ :sub:`7-0`
      - B\ :sub:`7-0`
      - A\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-RGBX32:

      - ``V4L2_PIX_FMT_RGBX32``
      - 'XB24'

      - R\ :sub:`7-0`
      - G\ :sub:`7-0`
      - B\ :sub:`7-0`
      - X\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-ARGB32:

      - ``V4L2_PIX_FMT_ARGB32``
      - 'BA24'

      - A\ :sub:`7-0`
      - R\ :sub:`7-0`
      - G\ :sub:`7-0`
      - B\ :sub:`7-0`
    * .. _V4L2-PIX-FMT-XRGB32:

      - ``V4L2_PIX_FMT_XRGB32``
      - 'BX24'

      - X\ :sub:`7-0`
      - R\ :sub:`7-0`
      - G\ :sub:`7-0`
      - B\ :sub:`7-0`

.. raw:: latex

    \normalsize

Component당 10 bit

766-955

10-bpc 형식은 30-bit RGB triplet과 선택적인 2-bit alpha를 4 byte에 저장합니다. 이름은 32-bit word에서 보이는 component 순서와 각 component bit 수를 기준으로 하고, word는 기본적으로 little-endian으로 memory에 저장됩니다. FourCC bit 31 표시는 예외 byte order를 뜻합니다.

10-bpc 32-bit word와 memory

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_RGBX1010102` / `RX30`Word=`R[9:0] G[9:0] B[9:0] X[1:0]`; B0=`B[5:0] X[1:0]`, B1=`G[3:0] B[9:6]`, B2=`R[1:0] G[9:4]`, B3=`R[9:2]`

`V4L2_PIX_FMT_RGBA1010102` / `RA30`Word=`R[9:0] G[9:0] B[9:0] A[1:0]`; RGBX와 같고 low 2 bit가 alpha

`V4L2_PIX_FMT_ARGB2101010` / `AR30`Word=`A[1:0] R[9:0] G[9:0] B[9:0]`; B0=`B[7:0]`, B1=`G[5:0] B[9:8]`, B2=`R[3:0] G[9:6]`, B3=`A[1:0] R[9:4]`

Word 표기는 bit 31→0, byte 표기는 낮은 주소부터입니다.

10-bit component 복원

Byte 0..3을 little-endian 32-bit word로 결합형식별 R/G/B/A 또는 X bit range mask각 10-bit color를 0..1023 값으로 추출2-bit alpha는 0..3으로 사용하거나 X면 폐기

Byte 경계를 가로지르는 component를 32-bit word에서 복원합니다.

10 Bits Per Component
=====================

These formats store a 30-bit RGB triplet with an optional 2 bit alpha in four
bytes. They are named based on the order of the RGB components as seen in a
32-bit word, which is then stored in memory in little endian byte order
(unless otherwise noted by the presence of bit 31 in the 4CC value), and on the
number of bits for each component.

.. raw:: latex

    \begingroup
    \tiny
    \setlength{\tabcolsep}{2pt}

.. tabularcolumns:: |p{3.2cm}|p{0.8cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|


.. flat-table:: RGB Formats 10 Bits Per Color Component
    :header-rows:  2
    :stub-columns: 0

    * - Identifier
      - Code
      - :cspan:`7` Byte 0 in memory
      - :cspan:`7` Byte 1
      - :cspan:`7` Byte 2
      - :cspan:`7` Byte 3
    * -
      -
      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0
    * .. _V4L2-PIX-FMT-RGBX1010102:

      - ``V4L2_PIX_FMT_RGBX1010102``
      - 'RX30'

      - b\ :sub:`5`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - x
      - x

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`9`
      - b\ :sub:`8`
      - b\ :sub:`7`
      - b\ :sub:`6`

      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`9`
      - g\ :sub:`8`
      - g\ :sub:`7`
      - g\ :sub:`6`
      - g\ :sub:`5`
      - g\ :sub:`4`

      - r\ :sub:`9`
      - r\ :sub:`8`
      - r\ :sub:`7`
      - r\ :sub:`6`
      - r\ :sub:`5`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
    * .. _V4L2-PIX-FMT-RGBA1010102:

      - ``V4L2_PIX_FMT_RGBA1010102``
      - 'RA30'

      - b\ :sub:`5`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      - a\ :sub:`1`
      - a\ :sub:`0`

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`9`
      - b\ :sub:`8`
      - b\ :sub:`7`
      - b\ :sub:`6`

      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`9`
      - g\ :sub:`8`
      - g\ :sub:`7`
      - g\ :sub:`6`
      - g\ :sub:`5`
      - g\ :sub:`4`

      - r\ :sub:`9`
      - r\ :sub:`8`
      - r\ :sub:`7`
      - r\ :sub:`6`
      - r\ :sub:`5`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
    * .. _V4L2-PIX-FMT-ARGB2101010:

      - ``V4L2_PIX_FMT_ARGB2101010``
      - 'AR30'

      - b\ :sub:`7`
      - b\ :sub:`6`
      - b\ :sub:`5`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - g\ :sub:`5`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`9`
      - b\ :sub:`8`

      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`9`
      - g\ :sub:`8`
      - g\ :sub:`7`
      - g\ :sub:`6`

      - a\ :sub:`1`
      - a\ :sub:`0`
      - r\ :sub:`9`
      - r\ :sub:`8`
      - r\ :sub:`7`
      - r\ :sub:`6`
      - r\ :sub:`5`
      - r\ :sub:`4`

.. raw:: latex

    \endgroup

Component당 12·16 bit

956-1052

12-bpc 형식은 RGB triplet을 6 byte, alpha 포함 형식은 8 byte에 저장합니다. 각 12-bit component를 16-bit word의 상위 bit 15:4로 확장하고 하위 4 bit는 0으로 채우며 word는 little-endian입니다.

12-bpc 형식

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_BGR48_12` / `B312`Bytes 1-0=B[15:4], 3-2=G[15:4], 5-4=R[15:4]

`V4L2_PIX_FMT_ABGR64_12` / `B412`Bytes 1-0=B[15:4], 3-2=G[15:4], 5-4=R[15:4], 7-6=A[15:4]

각 항목은 16-bit little-endian word 하나입니다.

16-bpc 형식은 RGB triplet을 6 byte에 저장하고 component마다 완전한 16-bit little-endian word를 사용합니다. 이름은 memory component 순서 기준이며, 48-bit little-endian word에서 보이는 순서를 쓰는 DRM naming과 다릅니다.

16-bpc 형식

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_BGR48` / `BGR6`B[7:0], B[15:8], G[7:0], G[15:8], R[7:0], R[15:8]

`V4L2_PIX_FMT_RGB48` / `RGB6`R[7:0], R[15:8], G[7:0], G[15:8], B[7:0], B[15:8]

각 component는 low byte 뒤 high byte 순서입니다.

12 Bits Per Component
==============================

These formats store an RGB triplet in six or eight bytes, 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.

.. raw:: latex

    \small

.. flat-table:: RGB Formats With 12 Bits Per Component
    :header-rows:  1

    * - Identifier
      - Code
      - Byte 1-0
      - Byte 3-2
      - Byte 5-4
      - Byte 7-6
    * .. _V4L2-PIX-FMT-BGR48-12:

      - ``V4L2_PIX_FMT_BGR48_12``
      - 'B312'

      - B\ :sub:`15-4`
      - G\ :sub:`15-4`
      - R\ :sub:`15-4`
      -
    * .. _V4L2-PIX-FMT-ABGR64-12:

      - ``V4L2_PIX_FMT_ABGR64_12``
      - 'B412'

      - B\ :sub:`15-4`
      - G\ :sub:`15-4`
      - R\ :sub:`15-4`
      - A\ :sub:`15-4`

.. raw:: latex

    \normalsize

16 Bits Per Component
=====================

These formats store an RGB triplet in six bytes, with 16 bits per component
stored in memory in little endian byte order. They are named based on the order
of the RGB components as stored in memory. For instance, RGB48 stores R\
:sub:`7:0` and R\ :sub:`15:8` in bytes 0 and 1 respectively. This differs from
the DRM format nomenclature that instead uses the order of components as seen in
the 48-bits little endian word.

.. raw:: latex

    \small

.. flat-table:: RGB Formats With 16 Bits Per Component
    :header-rows:  1

    * - Identifier
      - Code
      - Byte 0
      - Byte 1
      - Byte 2
      - Byte 3
      - Byte 4
      - Byte 5

    * .. _V4L2-PIX-FMT-BGR48:

      - ``V4L2_PIX_FMT_BGR48``
      - 'BGR6'

      - B\ :sub:`7-0`
      - B\ :sub:`15-8`
      - G\ :sub:`7-0`
      - G\ :sub:`15-8`
      - R\ :sub:`7-0`
      - R\ :sub:`15-8`

    * .. _V4L2-PIX-FMT-RGB48:

      - ``V4L2_PIX_FMT_RGB48``
      - 'RGB6'

      - R\ :sub:`7-0`
      - R\ :sub:`15-8`
      - G\ :sub:`7-0`
      - G\ :sub:`15-8`
      - B\ :sub:`7-0`
      - B\ :sub:`15-8`

.. raw:: latex

    \normalsize

Deprecated RGB 형식

1053-1278

`pixfmt-rgb-deprecated`에 정의된 형식은 deprecated이므로 새 driver가 사용하면 안 됩니다. 호환성 참고를 위해 남아 있으며 alpha bit `(a)`의 의미가 명확하지 않습니다. Driver에 따라 대응 ARGB의 alpha로 해석하거나 XRGB의 padding으로 해석합니다.

Deprecated packed RGB

Identifier / CodeMemory 배치

`V4L2_PIX_FMT_RGB444` / `R444`B0=`G[3:0] B[3:0]`; B1=`a[3:0] R[3:0]`; `a` 의미가 driver 의존

`V4L2_PIX_FMT_RGB555` / `RGBO`B0=`G[2:0] B[4:0]`; B1=`a R[4:0] G[4:3]`; `a` 의미가 driver 의존

`V4L2_PIX_FMT_RGB555X` / `RGBQ`B0=`a R[4:0] G[4:3]`; B1=`G[2:0] B[4:0]`; `a` 의미가 driver 의존

`V4L2_PIX_FMT_BGR32` / `BGR4`Byte 0=B, Byte 1=G, Byte 2=R, Byte 3=a

`V4L2_PIX_FMT_RGB32` / `RGB4`Byte 0=a, Byte 1=R, Byte 2=G, Byte 3=B

새 구현은 명확한 A/X 형식으로 대체해야 합니다.

권장 대체 원칙

Identifier / CodeMemory 배치

의미 있는 alphaARGB/ABGR/RGBA/BGRA 계열

사용하지 않는 bitXRGB/XBGR/RGBX/BGRX 계열

Legacy 호환Deprecated FourCC는 기존 driver와의 협상에만 사용

Alpha semantic을 FourCC 이름으로 명확히 합니다.

Driver가 실제 지원하는 RGB 형식을 판별하는 test utility는 LinuxTV v4l-dvb repository에서 제공됩니다. 접근 방법은 `https://linuxtv.org/repo/`를 참조합니다.

Deprecated RGB Formats
======================

Formats defined in :ref:`pixfmt-rgb-deprecated` are deprecated and must not be
used by new drivers. They are documented here for reference. The meaning of
their alpha bits ``(a)`` is ill-defined and they are interpreted as in either
the corresponding ARGB or XRGB format, depending on the driver.

.. raw:: latex

    \begingroup
    \tiny
    \setlength{\tabcolsep}{2pt}

.. tabularcolumns:: |p{2.6cm}|p{0.70cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|p{0.22cm}|

.. _pixfmt-rgb-deprecated:

.. flat-table:: Deprecated Packed RGB Image Formats
    :header-rows:  2
    :stub-columns: 0

    * - Identifier
      - Code
      - :cspan:`7` Byte 0 in memory

      - :cspan:`7` Byte 1

      - :cspan:`7` Byte 2

      - :cspan:`7` Byte 3
    * -
      -
      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0

      - 7
      - 6
      - 5
      - 4
      - 3
      - 2
      - 1
      - 0
    * .. _V4L2-PIX-FMT-RGB444:

      - ``V4L2_PIX_FMT_RGB444``
      - 'R444'

      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-RGB555:

      - ``V4L2_PIX_FMT_RGB555``
      - 'RGBO'

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - a
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`
      -
    * .. _V4L2-PIX-FMT-RGB555X:

      - ``V4L2_PIX_FMT_RGB555X``
      - 'RGBQ'

      - a
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`
      - g\ :sub:`4`
      - g\ :sub:`3`

      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`
      -
    * .. _V4L2-PIX-FMT-BGR32:

      - ``V4L2_PIX_FMT_BGR32``
      - 'BGR4'

      - b\ :sub:`7`
      - b\ :sub:`6`
      - b\ :sub:`5`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

      - g\ :sub:`7`
      - g\ :sub:`6`
      - g\ :sub:`5`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`

      - r\ :sub:`7`
      - r\ :sub:`6`
      - r\ :sub:`5`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`

      - a\ :sub:`7`
      - a\ :sub:`6`
      - a\ :sub:`5`
      - a\ :sub:`4`
      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`
    * .. _V4L2-PIX-FMT-RGB32:

      - ``V4L2_PIX_FMT_RGB32``
      - 'RGB4'

      - a\ :sub:`7`
      - a\ :sub:`6`
      - a\ :sub:`5`
      - a\ :sub:`4`
      - a\ :sub:`3`
      - a\ :sub:`2`
      - a\ :sub:`1`
      - a\ :sub:`0`

      - r\ :sub:`7`
      - r\ :sub:`6`
      - r\ :sub:`5`
      - r\ :sub:`4`
      - r\ :sub:`3`
      - r\ :sub:`2`
      - r\ :sub:`1`
      - r\ :sub:`0`

      - g\ :sub:`7`
      - g\ :sub:`6`
      - g\ :sub:`5`
      - g\ :sub:`4`
      - g\ :sub:`3`
      - g\ :sub:`2`
      - g\ :sub:`1`
      - g\ :sub:`0`

      - b\ :sub:`7`
      - b\ :sub:`6`
      - b\ :sub:`5`
      - b\ :sub:`4`
      - b\ :sub:`3`
      - b\ :sub:`2`
      - b\ :sub:`1`
      - b\ :sub:`0`

.. raw:: latex

    \endgroup

A test utility to determine which RGB formats a driver actually supports
is available from the LinuxTV v4l-dvb repository. See
`https://linuxtv.org/repo/ <https://linuxtv.org/repo/>`__ for access
instructions.