1 <partinfo> 2 <authorgroup> 3 <author> 4 <firstname>Michael</firstname> 5 <surname>Schimek</surname> 6 <othername role="mi">H</othername> 7 <affiliation> 8 <address> 9 <email>mschimek@gmx.at</email> 10 </address> 11 </affiliation> 12 </author> 13 14 <author> 15 <firstname>Bill</firstname> 16 <surname>Dirks</surname> 17 <!-- Commented until Bill opts in to be spammed. 18 <affiliation> 19 <address> 20 <email>bill@thedirks.org</email> 21 </address> 22 </affiliation> --> 23 <contrib>Original author of the V4L2 API and 24documentation.</contrib> 25 </author> 26 27 <author> 28 <firstname>Hans</firstname> 29 <surname>Verkuil</surname> 30 <contrib>Designed and documented the VIDIOC_LOG_STATUS ioctl, 31the extended control ioctls, major parts of the sliced VBI API, the 32MPEG encoder and decoder APIs and the DV Timings API.</contrib> 33 <affiliation> 34 <address> 35 <email>hverkuil@xs4all.nl</email> 36 </address> 37 </affiliation> 38 </author> 39 40 <author> 41 <firstname>Martin</firstname> 42 <surname>Rubli</surname> 43 <!-- 44 <affiliation> 45 <address> 46 <email>martin_rubli@logitech.com</email> 47 </address> 48 </affiliation> --> 49 <contrib>Designed and documented the VIDIOC_ENUM_FRAMESIZES 50and VIDIOC_ENUM_FRAMEINTERVALS ioctls.</contrib> 51 </author> 52 53 <author> 54 <firstname>Andy</firstname> 55 <surname>Walls</surname> 56 <contrib>Documented the fielded V4L2_MPEG_STREAM_VBI_FMT_IVTV 57MPEG stream embedded, sliced VBI data format in this specification. 58</contrib> 59 <affiliation> 60 <address> 61 <email>awalls@md.metrocast.net</email> 62 </address> 63 </affiliation> 64 </author> 65 66 <author> 67 <firstname>Mauro</firstname> 68 <surname>Carvalho Chehab</surname> 69 <contrib>Documented libv4l, designed and added v4l2grab example, 70Remote Controller chapter.</contrib> 71 <affiliation> 72 <address> 73 <email>m.chehab@samsung.com</email> 74 </address> 75 </affiliation> 76 </author> 77 78 <author> 79 <firstname>Muralidharan</firstname> 80 <surname>Karicheri</surname> 81 <contrib>Documented the Digital Video timings API.</contrib> 82 <affiliation> 83 <address> 84 <email>m-karicheri2@ti.com</email> 85 </address> 86 </affiliation> 87 </author> 88 89 <author> 90 <firstname>Pawel</firstname> 91 <surname>Osciak</surname> 92 <contrib>Designed and documented the multi-planar API.</contrib> 93 <affiliation> 94 <address> 95 <email>pawel AT osciak.com</email> 96 </address> 97 </affiliation> 98 </author> 99 100 <author> 101 <firstname>Sakari</firstname> 102 <surname>Ailus</surname> 103 <contrib>Subdev selections API.</contrib> 104 <affiliation> 105 <address> 106 <email>sakari.ailus@iki.fi</email> 107 </address> 108 </affiliation> 109 </author> 110 <author> 111 <firstname>Antti</firstname> 112 <surname>Palosaari</surname> 113 <contrib>SDR API.</contrib> 114 <affiliation> 115 <address> 116 <email>crope@iki.fi</email> 117 </address> 118 </affiliation> 119 </author> 120 </authorgroup> 121 122 <copyright> 123 <year>1999</year> 124 <year>2000</year> 125 <year>2001</year> 126 <year>2002</year> 127 <year>2003</year> 128 <year>2004</year> 129 <year>2005</year> 130 <year>2006</year> 131 <year>2007</year> 132 <year>2008</year> 133 <year>2009</year> 134 <year>2010</year> 135 <year>2011</year> 136 <year>2012</year> 137 <year>2013</year> 138 <year>2014</year> 139 <holder>Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin 140Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab, 141 Pawel Osciak</holder> 142 </copyright> 143 <legalnotice> 144 <para>Except when explicitly stated as GPL, programming examples within 145 this part can be used and distributed without restrictions.</para> 146 </legalnotice> 147 <revhistory> 148 <!-- Put document revisions here, newest first. --> 149 <!-- API revisions (changes and additions of defines, enums, 150structs, ioctls) must be noted in more detail in the history chapter 151(compat.xml), along with the possible impact on existing drivers and 152applications. --> 153 154 <revision> 155 <revnumber>3.17</revnumber> 156 <date>2014-08-04</date> 157 <authorinitials>lp, hv</authorinitials> 158 <revremark>Extended &v4l2-pix-format;. Added format flags. Added compound control types 159and VIDIOC_QUERY_EXT_CTRL. 160 </revremark> 161 </revision> 162 163 <revision> 164 <revnumber>3.15</revnumber> 165 <date>2014-02-03</date> 166 <authorinitials>hv, ap</authorinitials> 167 <revremark>Update several sections of "Common API Elements": "Opening and Closing Devices" 168"Querying Capabilities", "Application Priority", "Video Inputs and Outputs", "Audio Inputs and Outputs" 169"Tuners and Modulators", "Video Standards" and "Digital Video (DV) Timings". Added SDR API. 170 </revremark> 171 </revision> 172 173 <revision> 174 <revnumber>3.14</revnumber> 175 <date>2013-11-25</date> 176 <authorinitials>rr</authorinitials> 177 <revremark>Set width and height as unsigned on v4l2_rect. 178 </revremark> 179 </revision> 180 181 <revision> 182 <revnumber>3.11</revnumber> 183 <date>2013-05-26</date> 184 <authorinitials>hv</authorinitials> 185 <revremark>Remove obsolete VIDIOC_DBG_G_CHIP_IDENT ioctl. 186 </revremark> 187 </revision> 188 189 <revision> 190 <revnumber>3.10</revnumber> 191 <date>2013-03-25</date> 192 <authorinitials>hv</authorinitials> 193 <revremark>Remove obsolete and unused DV_PRESET ioctls: 194 VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET, VIDIOC_QUERY_DV_PRESET and 195 VIDIOC_ENUM_DV_PRESET. Remove the related v4l2_input/output capability 196 flags V4L2_IN_CAP_PRESETS and V4L2_OUT_CAP_PRESETS. Added VIDIOC_DBG_G_CHIP_INFO. 197 </revremark> 198 </revision> 199 200 <revision> 201 <revnumber>3.9</revnumber> 202 <date>2012-12-03</date> 203 <authorinitials>sa, sn</authorinitials> 204 <revremark>Added timestamp types to v4l2_buffer. 205 Added V4L2_EVENT_CTRL_CH_RANGE control event changes flag. 206 </revremark> 207 </revision> 208 209 <revision> 210 <revnumber>3.6</revnumber> 211 <date>2012-07-02</date> 212 <authorinitials>hv</authorinitials> 213 <revremark>Added VIDIOC_ENUM_FREQ_BANDS. 214 </revremark> 215 </revision> 216 217 <revision> 218 <revnumber>3.5</revnumber> 219 <date>2012-05-07</date> 220 <authorinitials>sa, sn, hv</authorinitials> 221 <revremark>Added V4L2_CTRL_TYPE_INTEGER_MENU and V4L2 subdev 222 selections API. Improved the description of V4L2_CID_COLORFX 223 control, added V4L2_CID_COLORFX_CBCR control. 224 Added camera controls V4L2_CID_AUTO_EXPOSURE_BIAS, 225 V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE, V4L2_CID_IMAGE_STABILIZATION, 226 V4L2_CID_ISO_SENSITIVITY, V4L2_CID_ISO_SENSITIVITY_AUTO, 227 V4L2_CID_EXPOSURE_METERING, V4L2_CID_SCENE_MODE, 228 V4L2_CID_3A_LOCK, V4L2_CID_AUTO_FOCUS_START, 229 V4L2_CID_AUTO_FOCUS_STOP, V4L2_CID_AUTO_FOCUS_STATUS 230 and V4L2_CID_AUTO_FOCUS_RANGE. 231 Added VIDIOC_ENUM_DV_TIMINGS, VIDIOC_QUERY_DV_TIMINGS and 232 VIDIOC_DV_TIMINGS_CAP. 233 </revremark> 234 </revision> 235 236 <revision> 237 <revnumber>3.4</revnumber> 238 <date>2012-01-25</date> 239 <authorinitials>sn</authorinitials> 240 <revremark>Added <link linkend="jpeg-controls">JPEG compression 241 control class.</link> 242 </revremark> 243 </revision> 244 245 <revision> 246 <revnumber>3.3</revnumber> 247 <date>2012-01-11</date> 248 <authorinitials>hv</authorinitials> 249 <revremark>Added device_caps field to struct v4l2_capabilities.</revremark> 250 </revision> 251 252 <revision> 253 <revnumber>3.2</revnumber> 254 <date>2011-08-26</date> 255 <authorinitials>hv</authorinitials> 256 <revremark>Added V4L2_CTRL_FLAG_VOLATILE.</revremark> 257 </revision> 258 259 <revision> 260 <revnumber>3.1</revnumber> 261 <date>2011-06-27</date> 262 <authorinitials>mcc, po, hv</authorinitials> 263 <revremark>Documented that VIDIOC_QUERYCAP now returns a per-subsystem version instead of a per-driver one. 264 Standardize an error code for invalid ioctl. 265 Added V4L2_CTRL_TYPE_BITMASK.</revremark> 266 </revision> 267 268 <revision> 269 <revnumber>2.6.39</revnumber> 270 <date>2011-03-01</date> 271 <authorinitials>mcc, po</authorinitials> 272 <revremark>Removed VIDIOC_*_OLD from videodev2.h header and update it to reflect latest changes. Added the <link linkend="planar-apis">multi-planar API</link>.</revremark> 273 </revision> 274 275 <revision> 276 <revnumber>2.6.37</revnumber> 277 <date>2010-08-06</date> 278 <authorinitials>hv</authorinitials> 279 <revremark>Removed obsolete vtx (videotext) API.</revremark> 280 </revision> 281 282 <revision> 283 <revnumber>2.6.33</revnumber> 284 <date>2009-12-03</date> 285 <authorinitials>mk</authorinitials> 286 <revremark>Added documentation for the Digital Video timings API.</revremark> 287 </revision> 288 289 <revision> 290 <revnumber>2.6.32</revnumber> 291 <date>2009-08-31</date> 292 <authorinitials>mcc</authorinitials> 293 <revremark>Now, revisions will match the kernel version where 294the V4L2 API changes will be used by the Linux Kernel. 295Also added Remote Controller chapter.</revremark> 296 </revision> 297 298 <revision> 299 <revnumber>0.29</revnumber> 300 <date>2009-08-26</date> 301 <authorinitials>ev</authorinitials> 302 <revremark>Added documentation for string controls and for FM Transmitter controls.</revremark> 303 </revision> 304 305 <revision> 306 <revnumber>0.28</revnumber> 307 <date>2009-08-26</date> 308 <authorinitials>gl</authorinitials> 309 <revremark>Added V4L2_CID_BAND_STOP_FILTER documentation.</revremark> 310 </revision> 311 312 <revision> 313 <revnumber>0.27</revnumber> 314 <date>2009-08-15</date> 315 <authorinitials>mcc</authorinitials> 316 <revremark>Added libv4l and Remote Controller documentation; 317added v4l2grab and keytable application examples.</revremark> 318 </revision> 319 320 <revision> 321 <revnumber>0.26</revnumber> 322 <date>2009-07-23</date> 323 <authorinitials>hv</authorinitials> 324 <revremark>Finalized the RDS capture API. Added modulator and RDS encoder 325capabilities. Added support for string controls.</revremark> 326 </revision> 327 328 <revision> 329 <revnumber>0.25</revnumber> 330 <date>2009-01-18</date> 331 <authorinitials>hv</authorinitials> 332 <revremark>Added pixel formats VYUY, NV16 and NV61, and changed 333the debug ioctls VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT. 334Added camera controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE, 335V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY.</revremark> 336 </revision> 337 338 <revision> 339 <revnumber>0.24</revnumber> 340 <date>2008-03-04</date> 341 <authorinitials>mhs</authorinitials> 342 <revremark>Added pixel formats Y16 and SBGGR16, new controls 343and a camera controls class. Removed VIDIOC_G/S_MPEGCOMP.</revremark> 344 </revision> 345 346 <revision> 347 <revnumber>0.23</revnumber> 348 <date>2007-08-30</date> 349 <authorinitials>mhs</authorinitials> 350 <revremark>Fixed a typo in VIDIOC_DBG_G/S_REGISTER. 351Clarified the byte order of packed pixel formats.</revremark> 352 </revision> 353 354 <revision> 355 <revnumber>0.22</revnumber> 356 <date>2007-08-29</date> 357 <authorinitials>mhs</authorinitials> 358 <revremark>Added the Video Output Overlay interface, new MPEG 359controls, V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT, 360VIDIOC_DBG_G/S_REGISTER, VIDIOC_(TRY_)ENCODER_CMD, 361VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats. 362Clarifications in the cropping chapter, about RGB pixel formats, the 363mmap(), poll(), select(), read() and write() functions. Typographical 364fixes.</revremark> 365 </revision> 366 367 <revision> 368 <revnumber>0.21</revnumber> 369 <date>2006-12-19</date> 370 <authorinitials>mhs</authorinitials> 371 <revremark>Fixed a link in the VIDIOC_G_EXT_CTRLS section.</revremark> 372 </revision> 373 374 <revision> 375 <revnumber>0.20</revnumber> 376 <date>2006-11-24</date> 377 <authorinitials>mhs</authorinitials> 378 <revremark>Clarified the purpose of the audioset field in 379struct v4l2_input and v4l2_output.</revremark> 380 </revision> 381 382 <revision> 383 <revnumber>0.19</revnumber> 384 <date>2006-10-19</date> 385 <authorinitials>mhs</authorinitials> 386 <revremark>Documented V4L2_PIX_FMT_RGB444.</revremark> 387 </revision> 388 389 <revision> 390 <revnumber>0.18</revnumber> 391 <date>2006-10-18</date> 392 <authorinitials>mhs</authorinitials> 393 <revremark>Added the description of extended controls by Hans 394Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE.</revremark> 395 </revision> 396 397 <revision> 398 <revnumber>0.17</revnumber> 399 <date>2006-10-12</date> 400 <authorinitials>mhs</authorinitials> 401 <revremark>Corrected V4L2_PIX_FMT_HM12 description.</revremark> 402 </revision> 403 404 <revision> 405 <revnumber>0.16</revnumber> 406 <date>2006-10-08</date> 407 <authorinitials>mhs</authorinitials> 408 <revremark>VIDIOC_ENUM_FRAMESIZES and 409VIDIOC_ENUM_FRAMEINTERVALS are now part of the API.</revremark> 410 </revision> 411 412 <revision> 413 <revnumber>0.15</revnumber> 414 <date>2006-09-23</date> 415 <authorinitials>mhs</authorinitials> 416 <revremark>Cleaned up the bibliography, added BT.653 and 417BT.1119. capture.c/start_capturing() for user pointer I/O did not 418initialize the buffer index. Documented the V4L MPEG and MJPEG 419VID_TYPEs and V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel 420formats. See the history chapter for API changes.</revremark> 421 </revision> 422 423 <revision> 424 <revnumber>0.14</revnumber> 425 <date>2006-09-14</date> 426 <authorinitials>mr</authorinitials> 427 <revremark>Added VIDIOC_ENUM_FRAMESIZES and 428VIDIOC_ENUM_FRAMEINTERVALS proposal for frame format enumeration of 429digital devices.</revremark> 430 </revision> 431 432 <revision> 433 <revnumber>0.13</revnumber> 434 <date>2006-04-07</date> 435 <authorinitials>mhs</authorinitials> 436 <revremark>Corrected the description of struct v4l2_window 437clips. New V4L2_STD_ and V4L2_TUNER_MODE_LANG1_LANG2 438defines.</revremark> 439 </revision> 440 441 <revision> 442 <revnumber>0.12</revnumber> 443 <date>2006-02-03</date> 444 <authorinitials>mhs</authorinitials> 445 <revremark>Corrected the description of struct 446v4l2_captureparm and v4l2_outputparm.</revremark> 447 </revision> 448 449 <revision> 450 <revnumber>0.11</revnumber> 451 <date>2006-01-27</date> 452 <authorinitials>mhs</authorinitials> 453 <revremark>Improved the description of struct 454v4l2_tuner.</revremark> 455 </revision> 456 457 <revision> 458 <revnumber>0.10</revnumber> 459 <date>2006-01-10</date> 460 <authorinitials>mhs</authorinitials> 461 <revremark>VIDIOC_G_INPUT and VIDIOC_S_PARM 462clarifications.</revremark> 463 </revision> 464 465 <revision> 466 <revnumber>0.9</revnumber> 467 <date>2005-11-27</date> 468 <authorinitials>mhs</authorinitials> 469 <revremark>Improved the 525 line numbering diagram. Hans 470Verkuil and I rewrote the sliced VBI section. He also contributed a 471VIDIOC_LOG_STATUS page. Fixed VIDIOC_S_STD call in the video standard 472selection example. Various updates.</revremark> 473 </revision> 474 475 <revision> 476 <revnumber>0.8</revnumber> 477 <date>2004-10-04</date> 478 <authorinitials>mhs</authorinitials> 479 <revremark>Somehow a piece of junk slipped into the capture 480example, removed.</revremark> 481 </revision> 482 483 <revision> 484 <revnumber>0.7</revnumber> 485 <date>2004-09-19</date> 486 <authorinitials>mhs</authorinitials> 487 <revremark>Fixed video standard selection, control 488enumeration, downscaling and aspect example. Added read and user 489pointer i/o to video capture example.</revremark> 490 </revision> 491 492 <revision> 493 <revnumber>0.6</revnumber> 494 <date>2004-08-01</date> 495 <authorinitials>mhs</authorinitials> 496 <revremark>v4l2_buffer changes, added video capture example, 497various corrections.</revremark> 498 </revision> 499 500 <revision> 501 <revnumber>0.5</revnumber> 502 <date>2003-11-05</date> 503 <authorinitials>mhs</authorinitials> 504 <revremark>Pixel format erratum.</revremark> 505 </revision> 506 507 <revision> 508 <revnumber>0.4</revnumber> 509 <date>2003-09-17</date> 510 <authorinitials>mhs</authorinitials> 511 <revremark>Corrected source and Makefile to generate a PDF. 512SGML fixes. Added latest API changes. Closed gaps in the history 513chapter.</revremark> 514 </revision> 515 516 <revision> 517 <revnumber>0.3</revnumber> 518 <date>2003-02-05</date> 519 <authorinitials>mhs</authorinitials> 520 <revremark>Another draft, more corrections.</revremark> 521 </revision> 522 523 <revision> 524 <revnumber>0.2</revnumber> 525 <date>2003-01-15</date> 526 <authorinitials>mhs</authorinitials> 527 <revremark>Second draft, with corrections pointed out by Gerd 528Knorr.</revremark> 529 </revision> 530 531 <revision> 532 <revnumber>0.1</revnumber> 533 <date>2002-12-01</date> 534 <authorinitials>mhs</authorinitials> 535 <revremark>First draft, based on documentation by Bill Dirks 536and discussions on the V4L mailing list.</revremark> 537 </revision> 538 </revhistory> 539</partinfo> 540 541<title>Video for Linux Two API Specification</title> 542 <subtitle>Revision 3.17</subtitle> 543 544 <chapter id="common"> 545 &sub-common; 546 </chapter> 547 548 <chapter id="pixfmt"> 549 &sub-pixfmt; 550 </chapter> 551 552 <chapter id="io"> 553 &sub-io; 554 </chapter> 555 556 <chapter id="devices"> 557 <title>Interfaces</title> 558 559 <section id="capture"> &sub-dev-capture; </section> 560 <section id="overlay"> &sub-dev-overlay; </section> 561 <section id="output"> &sub-dev-output; </section> 562 <section id="osd"> &sub-dev-osd; </section> 563 <section id="codec"> &sub-dev-codec; </section> 564 <section id="effect"> &sub-dev-effect; </section> 565 <section id="raw-vbi"> &sub-dev-raw-vbi; </section> 566 <section id="sliced"> &sub-dev-sliced-vbi; </section> 567 <section id="ttx"> &sub-dev-teletext; </section> 568 <section id="radio"> &sub-dev-radio; </section> 569 <section id="rds"> &sub-dev-rds; </section> 570 <section id="sdr"> &sub-dev-sdr; </section> 571 <section id="event"> &sub-dev-event; </section> 572 <section id="subdev"> &sub-dev-subdev; </section> 573 </chapter> 574 575 <chapter id="driver"> 576 &sub-driver; 577 </chapter> 578 579 <chapter id="libv4l"> 580 &sub-libv4l; 581 </chapter> 582 583 <chapter id="compat"> 584 &sub-compat; 585 </chapter> 586 587 <appendix id="user-func"> 588 <title>Function Reference</title> 589 590 <!-- Keep this alphabetically sorted. --> 591 592 &sub-close; 593 &sub-ioctl; 594 <!-- All ioctls go here. --> 595 &sub-create-bufs; 596 &sub-cropcap; 597 &sub-dbg-g-chip-info; 598 &sub-dbg-g-register; 599 &sub-decoder-cmd; 600 &sub-dqevent; 601 &sub-dv-timings-cap; 602 &sub-encoder-cmd; 603 &sub-enumaudio; 604 &sub-enumaudioout; 605 &sub-enum-dv-timings; 606 &sub-enum-fmt; 607 &sub-enum-framesizes; 608 &sub-enum-frameintervals; 609 &sub-enum-freq-bands; 610 &sub-enuminput; 611 &sub-enumoutput; 612 &sub-enumstd; 613 &sub-expbuf; 614 &sub-g-audio; 615 &sub-g-audioout; 616 &sub-g-crop; 617 &sub-g-ctrl; 618 &sub-g-dv-timings; 619 &sub-g-edid; 620 &sub-g-enc-index; 621 &sub-g-ext-ctrls; 622 &sub-g-fbuf; 623 &sub-g-fmt; 624 &sub-g-frequency; 625 &sub-g-input; 626 &sub-g-jpegcomp; 627 &sub-g-modulator; 628 &sub-g-output; 629 &sub-g-parm; 630 &sub-g-priority; 631 &sub-g-selection; 632 &sub-g-sliced-vbi-cap; 633 &sub-g-std; 634 &sub-g-tuner; 635 &sub-log-status; 636 &sub-overlay; 637 &sub-prepare-buf; 638 &sub-qbuf; 639 &sub-querybuf; 640 &sub-querycap; 641 &sub-queryctrl; 642 &sub-query-dv-timings; 643 &sub-querystd; 644 &sub-reqbufs; 645 &sub-s-hw-freq-seek; 646 &sub-streamon; 647 &sub-subdev-enum-frame-interval; 648 &sub-subdev-enum-frame-size; 649 &sub-subdev-enum-mbus-code; 650 &sub-subdev-g-crop; 651 &sub-subdev-g-fmt; 652 &sub-subdev-g-frame-interval; 653 &sub-subdev-g-selection; 654 &sub-subscribe-event; 655 <!-- End of ioctls. --> 656 &sub-mmap; 657 &sub-munmap; 658 &sub-open; 659 &sub-poll; 660 &sub-read; 661 &sub-select; 662 &sub-write; 663 </appendix> 664 665 <appendix> 666 <title>Common definitions for V4L2 and V4L2 subdev interfaces</title> 667 &sub-selections-common; 668 </appendix> 669 670 <appendix id="videodev"> 671 <title>Video For Linux Two Header File</title> 672 &sub-videodev2-h; 673 </appendix> 674 675 <appendix id="capture-example"> 676 <title>Video Capture Example</title> 677 &sub-capture-c; 678 </appendix> 679 680 <appendix id="v4l2grab-example"> 681 <title>Video Grabber example using libv4l</title> 682 <para>This program demonstrates how to grab V4L2 images in ppm format by 683using libv4l handlers. The advantage is that this grabber can potentially work 684with any V4L2 driver.</para> 685 &sub-v4l2grab-c; 686 </appendix> 687 688 &sub-media-indices; 689 690 &sub-biblio; 691 692