release/src-rt-6.x.4708/linux/linux-2.6.36/Documentation/DocBook/v4l/v4l2.xml

   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
  24 documentation.</contrib>
  25       </author>
  26
  27       <author>
  28         <firstname>Hans</firstname>
  29         <surname>Verkuil</surname>
  30         <contrib>Designed and documented the VIDIOC_LOG_STATUS ioctl,
  31 the extended control ioctls and major parts of the sliced VBI
  32 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
  50 and 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
  57 MPEG 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,
  70 Remote Controller chapter.</contrib>
  71         <affiliation>
  72           <address>
  73             <email>mchehab@redhat.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     </authorgroup>
  89
  90     <copyright>
  91       <year>1999</year>
  92       <year>2000</year>
  93       <year>2001</year>
  94       <year>2002</year>
  95       <year>2003</year>
  96       <year>2004</year>
  97       <year>2005</year>
  98       <year>2006</year>
  99       <year>2007</year>
 100       <year>2008</year>
 101       <year>2009</year>
 102       <holder>Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin
 103 Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab</holder>
 104     </copyright>
 105     <legalnotice>
 106     <para>Except when explicitly stated as GPL, programming examples within
 107             this part can be used and distributed without restrictions.</para>
 108     </legalnotice>
 109     <revhistory>
 110       <!-- Put document revisions here, newest first. -->
 111       <!-- API revisions (changes and additions of defines, enums,
 112 structs, ioctls) must be noted in more detail in the history chapter
 113 (compat.sgml), along with the possible impact on existing drivers and
 114 applications. -->
 115
 116       <revision>
 117         <revnumber>2.6.33</revnumber>
 118         <date>2009-12-03</date>
 119         <authorinitials>mk</authorinitials>
 120         <revremark>Added documentation for the Digital Video timings API.</revremark>
 121       </revision>
 122
 123       <revision>
 124         <revnumber>2.6.32</revnumber>
 125         <date>2009-08-31</date>
 126         <authorinitials>mcc</authorinitials>
 127         <revremark>Now, revisions will match the kernel version where
 128 the V4L2 API changes will be used by the Linux Kernel.
 129 Also added Remote Controller chapter.</revremark>
 130       </revision>
 131
 132       <revision>
 133         <revnumber>0.29</revnumber>
 134         <date>2009-08-26</date>
 135         <authorinitials>ev</authorinitials>
 136         <revremark>Added documentation for string controls and for FM Transmitter controls.</revremark>
 137       </revision>
 138
 139       <revision>
 140         <revnumber>0.28</revnumber>
 141         <date>2009-08-26</date>
 142         <authorinitials>gl</authorinitials>
 143         <revremark>Added V4L2_CID_BAND_STOP_FILTER documentation.</revremark>
 144       </revision>
 145
 146       <revision>
 147         <revnumber>0.27</revnumber>
 148         <date>2009-08-15</date>
 149         <authorinitials>mcc</authorinitials>
 150         <revremark>Added libv4l and Remote Controller documentation;
 151 added v4l2grab and keytable application examples.</revremark>
 152       </revision>
 153
 154       <revision>
 155         <revnumber>0.26</revnumber>
 156         <date>2009-07-23</date>
 157         <authorinitials>hv</authorinitials>
 158         <revremark>Finalized the RDS capture API. Added modulator and RDS encoder
 159 capabilities. Added support for string controls.</revremark>
 160       </revision>
 161
 162       <revision>
 163         <revnumber>0.25</revnumber>
 164         <date>2009-01-18</date>
 165         <authorinitials>hv</authorinitials>
 166         <revremark>Added pixel formats VYUY, NV16 and NV61, and changed
 167 the debug ioctls VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT.
 168 Added camera controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE,
 169 V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY.</revremark>
 170       </revision>
 171
 172       <revision>
 173         <revnumber>0.24</revnumber>
 174         <date>2008-03-04</date>
 175         <authorinitials>mhs</authorinitials>
 176         <revremark>Added pixel formats Y16 and SBGGR16, new controls
 177 and a camera controls class. Removed VIDIOC_G/S_MPEGCOMP.</revremark>
 178       </revision>
 179
 180       <revision>
 181         <revnumber>0.23</revnumber>
 182         <date>2007-08-30</date>
 183         <authorinitials>mhs</authorinitials>
 184         <revremark>Fixed a typo in VIDIOC_DBG_G/S_REGISTER.
 185 Clarified the byte order of packed pixel formats.</revremark>
 186       </revision>
 187
 188       <revision>
 189         <revnumber>0.22</revnumber>
 190         <date>2007-08-29</date>
 191         <authorinitials>mhs</authorinitials>
 192         <revremark>Added the Video Output Overlay interface, new MPEG
 193 controls, V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT,
 194 VIDIOC_DBG_G/S_REGISTER, VIDIOC_(TRY_)ENCODER_CMD,
 195 VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats.
 196 Clarifications in the cropping chapter, about RGB pixel formats, the
 197 mmap(), poll(), select(), read() and write() functions. Typographical
 198 fixes.</revremark>
 199       </revision>
 200
 201       <revision>
 202         <revnumber>0.21</revnumber>
 203         <date>2006-12-19</date>
 204         <authorinitials>mhs</authorinitials>
 205         <revremark>Fixed a link in the VIDIOC_G_EXT_CTRLS section.</revremark>
 206       </revision>
 207
 208       <revision>
 209         <revnumber>0.20</revnumber>
 210         <date>2006-11-24</date>
 211         <authorinitials>mhs</authorinitials>
 212         <revremark>Clarified the purpose of the audioset field in
 213 struct v4l2_input and v4l2_output.</revremark>
 214       </revision>
 215
 216       <revision>
 217         <revnumber>0.19</revnumber>
 218         <date>2006-10-19</date>
 219         <authorinitials>mhs</authorinitials>
 220         <revremark>Documented V4L2_PIX_FMT_RGB444.</revremark>
 221       </revision>
 222
 223       <revision>
 224         <revnumber>0.18</revnumber>
 225         <date>2006-10-18</date>
 226         <authorinitials>mhs</authorinitials>
 227         <revremark>Added the description of extended controls by Hans
 228 Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE.</revremark>
 229       </revision>
 230
 231       <revision>
 232         <revnumber>0.17</revnumber>
 233         <date>2006-10-12</date>
 234         <authorinitials>mhs</authorinitials>
 235         <revremark>Corrected V4L2_PIX_FMT_HM12 description.</revremark>
 236       </revision>
 237
 238       <revision>
 239         <revnumber>0.16</revnumber>
 240         <date>2006-10-08</date>
 241         <authorinitials>mhs</authorinitials>
 242         <revremark>VIDIOC_ENUM_FRAMESIZES and
 243 VIDIOC_ENUM_FRAMEINTERVALS are now part of the API.</revremark>
 244       </revision>
 245
 246       <revision>
 247         <revnumber>0.15</revnumber>
 248         <date>2006-09-23</date>
 249         <authorinitials>mhs</authorinitials>
 250         <revremark>Cleaned up the bibliography, added BT.653 and
 251 BT.1119. capture.c/start_capturing() for user pointer I/O did not
 252 initialize the buffer index. Documented the V4L MPEG and MJPEG
 253 VID_TYPEs and V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel
 254 formats. See the history chapter for API changes.</revremark>
 255       </revision>
 256
 257       <revision>
 258         <revnumber>0.14</revnumber>
 259         <date>2006-09-14</date>
 260         <authorinitials>mr</authorinitials>
 261         <revremark>Added VIDIOC_ENUM_FRAMESIZES and
 262 VIDIOC_ENUM_FRAMEINTERVALS proposal for frame format enumeration of
 263 digital devices.</revremark>
 264       </revision>
 265
 266       <revision>
 267         <revnumber>0.13</revnumber>
 268         <date>2006-04-07</date>
 269         <authorinitials>mhs</authorinitials>
 270         <revremark>Corrected the description of struct v4l2_window
 271 clips. New V4L2_STD_ and V4L2_TUNER_MODE_LANG1_LANG2
 272 defines.</revremark>
 273       </revision>
 274
 275       <revision>
 276         <revnumber>0.12</revnumber>
 277         <date>2006-02-03</date>
 278         <authorinitials>mhs</authorinitials>
 279         <revremark>Corrected the description of struct
 280 v4l2_captureparm and v4l2_outputparm.</revremark>
 281       </revision>
 282
 283       <revision>
 284         <revnumber>0.11</revnumber>
 285         <date>2006-01-27</date>
 286         <authorinitials>mhs</authorinitials>
 287         <revremark>Improved the description of struct
 288 v4l2_tuner.</revremark>
 289       </revision>
 290
 291       <revision>
 292         <revnumber>0.10</revnumber>
 293         <date>2006-01-10</date>
 294         <authorinitials>mhs</authorinitials>
 295         <revremark>VIDIOC_G_INPUT and VIDIOC_S_PARM
 296 clarifications.</revremark>
 297       </revision>
 298
 299       <revision>
 300         <revnumber>0.9</revnumber>
 301         <date>2005-11-27</date>
 302         <authorinitials>mhs</authorinitials>
 303         <revremark>Improved the 525 line numbering diagram. Hans
 304 Verkuil and I rewrote the sliced VBI section. He also contributed a
 305 VIDIOC_LOG_STATUS page. Fixed VIDIOC_S_STD call in the video standard
 306 selection example. Various updates.</revremark>
 307       </revision>
 308
 309       <revision>
 310         <revnumber>0.8</revnumber>
 311         <date>2004-10-04</date>
 312         <authorinitials>mhs</authorinitials>
 313         <revremark>Somehow a piece of junk slipped into the capture
 314 example, removed.</revremark>
 315       </revision>
 316
 317       <revision>
 318         <revnumber>0.7</revnumber>
 319         <date>2004-09-19</date>
 320         <authorinitials>mhs</authorinitials>
 321         <revremark>Fixed video standard selection, control
 322 enumeration, downscaling and aspect example. Added read and user
 323 pointer i/o to video capture example.</revremark>
 324       </revision>
 325
 326       <revision>
 327         <revnumber>0.6</revnumber>
 328         <date>2004-08-01</date>
 329         <authorinitials>mhs</authorinitials>
 330         <revremark>v4l2_buffer changes, added video capture example,
 331 various corrections.</revremark>
 332       </revision>
 333
 334       <revision>
 335         <revnumber>0.5</revnumber>
 336         <date>2003-11-05</date>
 337         <authorinitials>mhs</authorinitials>
 338         <revremark>Pixel format erratum.</revremark>
 339       </revision>
 340
 341       <revision>
 342         <revnumber>0.4</revnumber>
 343         <date>2003-09-17</date>
 344         <authorinitials>mhs</authorinitials>
 345         <revremark>Corrected source and Makefile to generate a PDF.
 346 SGML fixes. Added latest API changes. Closed gaps in the history
 347 chapter.</revremark>
 348       </revision>
 349
 350       <revision>
 351         <revnumber>0.3</revnumber>
 352         <date>2003-02-05</date>
 353         <authorinitials>mhs</authorinitials>
 354         <revremark>Another draft, more corrections.</revremark>
 355       </revision>
 356
 357       <revision>
 358         <revnumber>0.2</revnumber>
 359         <date>2003-01-15</date>
 360         <authorinitials>mhs</authorinitials>
 361         <revremark>Second draft, with corrections pointed out by Gerd
 362 Knorr.</revremark>
 363       </revision>
 364
 365       <revision>
 366         <revnumber>0.1</revnumber>
 367         <date>2002-12-01</date>
 368         <authorinitials>mhs</authorinitials>
 369         <revremark>First draft, based on documentation by Bill Dirks
 370 and discussions on the V4L mailing list.</revremark>
 371       </revision>
 372     </revhistory>
 373 </partinfo>
 374
 375 <title>Video for Linux Two API Specification</title>
 376  <subtitle>Revision 2.6.33</subtitle>
 377
 378   <chapter id="common">
 379     &sub-common;
 380   </chapter>
 381
 382   <chapter id="pixfmt">
 383     &sub-pixfmt;
 384   </chapter>
 385
 386   <chapter id="io">
 387     &sub-io;
 388   </chapter>
 389
 390   <chapter id="devices">
 391     <title>Interfaces</title>
 392
 393     <section id="capture"> &sub-dev-capture; </section>
 394     <section id="overlay"> &sub-dev-overlay; </section>
 395     <section id="output"> &sub-dev-output; </section>
 396     <section id="osd"> &sub-dev-osd; </section>
 397     <section id="codec"> &sub-dev-codec; </section>
 398     <section id="effect"> &sub-dev-effect; </section>
 399     <section id="raw-vbi"> &sub-dev-raw-vbi; </section>
 400     <section id="sliced"> &sub-dev-sliced-vbi; </section>
 401     <section id="ttx"> &sub-dev-teletext; </section>
 402     <section id="radio"> &sub-dev-radio; </section>
 403     <section id="rds"> &sub-dev-rds; </section>
 404     <section id="event"> &sub-dev-event; </section>
 405   </chapter>
 406
 407   <chapter id="driver">
 408           &sub-driver;
 409   </chapter>
 410
 411   <chapter id="libv4l">
 412           &sub-libv4l;
 413   </chapter>
 414
 415   <chapter id="compat">
 416           &sub-compat;
 417   </chapter>
 418
 419   <appendix id="user-func">
 420   <title>Function Reference</title>
 421
 422     <!-- Keep this alphabetically sorted. -->
 423
 424     &sub-close;
 425     &sub-ioctl;
 426     <!-- All ioctls go here. -->
 427     &sub-cropcap;
 428     &sub-dbg-g-chip-ident;
 429     &sub-dbg-g-register;
 430     &sub-dqevent;
 431     &sub-encoder-cmd;
 432     &sub-enumaudio;
 433     &sub-enumaudioout;
 434     &sub-enum-dv-presets;
 435     &sub-enum-fmt;
 436     &sub-enum-framesizes;
 437     &sub-enum-frameintervals;
 438     &sub-enuminput;
 439     &sub-enumoutput;
 440     &sub-enumstd;
 441     &sub-g-audio;
 442     &sub-g-audioout;
 443     &sub-g-crop;
 444     &sub-g-ctrl;
 445     &sub-g-dv-preset;
 446     &sub-g-dv-timings;
 447     &sub-g-enc-index;
 448     &sub-g-ext-ctrls;
 449     &sub-g-fbuf;
 450     &sub-g-fmt;
 451     &sub-g-frequency;
 452     &sub-g-input;
 453     &sub-g-jpegcomp;
 454     &sub-g-modulator;
 455     &sub-g-output;
 456     &sub-g-parm;
 457     &sub-g-priority;
 458     &sub-g-sliced-vbi-cap;
 459     &sub-g-std;
 460     &sub-g-tuner;
 461     &sub-log-status;
 462     &sub-overlay;
 463     &sub-qbuf;
 464     &sub-querybuf;
 465     &sub-querycap;
 466     &sub-queryctrl;
 467     &sub-query-dv-preset;
 468     &sub-querystd;
 469     &sub-reqbufs;
 470     &sub-s-hw-freq-seek;
 471     &sub-streamon;
 472     &sub-subscribe-event;
 473     <!-- End of ioctls. -->
 474     &sub-mmap;
 475     &sub-munmap;
 476     &sub-open;
 477     &sub-poll;
 478     &sub-read;
 479     &sub-select;
 480     &sub-write;
 481   </appendix>
 482
 483   <appendix id="videodev">
 484     <title>Video For Linux Two Header File</title>
 485     &sub-videodev2-h;
 486   </appendix>
 487
 488   <appendix id="capture-example">
 489     <title>Video Capture Example</title>
 490     &sub-capture-c;
 491   </appendix>
 492
 493   <appendix id="v4l2grab-example">
 494     <title>Video Grabber example using libv4l</title>
 495     <para>This program demonstrates how to grab V4L2 images in ppm format by
 496 using libv4l handlers. The advantage is that this grabber can potentially work
 497 with any V4L2 driver.</para>
 498     &sub-v4l2grab-c;
 499   </appendix>
 500
 501   &sub-media-indices;
 502
 503   &sub-biblio;
 504