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1 | .. -*- coding: utf-8; mode: rst -*- |
2 | ||
080df77f | 3 | .. include:: <isonum.txt> |
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4 | .. _v4l2spec: |
5 | ||
da83c888 MCC |
6 | ############################ |
7 | Part I - Video for Linux API | |
8 | ############################ | |
62acdf35 MCC |
9 | |
10 | This part describes the Video for Linux API version 2 (V4L2 API) specification. | |
5377d91f | 11 | |
080df77f | 12 | **Revision 4.5** |
5377d91f | 13 | |
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14 | .. class:: toc-title |
15 | ||
16 | Table of Contents | |
17 | ||
5377d91f | 18 | .. toctree:: |
c7685f27 | 19 | :numbered: |
da83c888 | 20 | :maxdepth: 5 |
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21 | |
22 | common | |
23 | pixfmt | |
24 | io | |
25 | devices | |
26 | driver | |
27 | libv4l | |
28 | compat | |
29 | user-func | |
30 | common-defs | |
31 | videodev | |
32 | capture-example | |
33 | v4l2grab-example | |
34 | biblio | |
35 | ||
36 | ||
37 | ********************** | |
38 | Revision and Copyright | |
39 | ********************** | |
40 | ||
080df77f | 41 | Authors, in alphabetical order: |
5377d91f | 42 | |
080df77f | 43 | - Ailus, Sakari <sakari.ailus@iki.fi> |
5377d91f | 44 | |
080df77f | 45 | - Subdev selections API. |
5377d91f | 46 | |
080df77f | 47 | - Carvalho Chehab, Mauro <m.chehab@kernel.org> |
5377d91f | 48 | |
080df77f | 49 | - Documented libv4l, designed and added v4l2grab example, Remote Controller chapter. |
5377d91f | 50 | |
080df77f | 51 | - Dirks, Bill |
5377d91f | 52 | |
080df77f | 53 | - Original author of the V4L2 API and documentation. |
5377d91f | 54 | |
080df77f | 55 | - H Schimek, Michael <mschimek@gmx.at> |
5377d91f | 56 | |
080df77f | 57 | - Original author of the V4L2 API and documentation. |
5377d91f | 58 | |
080df77f | 59 | - Karicheri, Muralidharan <m-karicheri2@ti.com> |
5377d91f | 60 | |
080df77f | 61 | - Documented the Digital Video timings API. |
5377d91f | 62 | |
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63 | - Osciak, Pawel <pawel@osciak.com> |
64 | ||
65 | - Designed and documented the multi-planar API. | |
66 | ||
67 | - Palosaari, Antti <crope@iki.fi> | |
68 | ||
69 | - SDR API. | |
70 | ||
71 | - Rubli, Martin | |
72 | ||
73 | - Designed and documented the VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS ioctls. | |
74 | ||
75 | - Walls, Andy <awalls@md.metrocast.net> | |
76 | ||
77 | - Documented the fielded V4L2_MPEG_STREAM_VBI_FMT_IVTV MPEG stream embedded, sliced VBI data format in this specification. | |
78 | ||
79 | - Verkuil, Hans <hverkuil@xs4all.nl> | |
80 | ||
81 | - Designed and documented the VIDIOC_LOG_STATUS ioctl, the extended control ioctls, major parts of the sliced VBI API, the MPEG encoder and decoder APIs and the DV Timings API. | |
82 | ||
83 | **Copyright** |copy| 1999-2016: Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab, Pawel Osciak, Sakari Ailus & Antti Palosaari. | |
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84 | |
85 | Except when explicitly stated as GPL, programming examples within this | |
86 | part can be used and distributed without restrictions. | |
87 | ||
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88 | **************** |
89 | Revision History | |
90 | **************** | |
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91 | |
92 | :revision: 4.5 / 2015-10-29 (*rr*) | |
93 | ||
af4a4d0d | 94 | Extend VIDIOC_G_EXT_CTRLS;. Replace ctrl_class with a new union with |
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95 | ctrl_class and which. Which is used to select the current value of the |
96 | control or the default value. | |
97 | ||
98 | ||
99 | :revision: 4.4 / 2015-05-26 (*ap*) | |
100 | ||
101 | Renamed V4L2_TUNER_ADC to V4L2_TUNER_SDR. Added | |
102 | V4L2_CID_RF_TUNER_RF_GAIN control. Added transmitter support for | |
103 | Software Defined Radio (SDR) Interface. | |
104 | ||
105 | ||
106 | :revision: 4.1 / 2015-02-13 (*mcc*) | |
107 | ||
108 | Fix documentation for media controller device nodes and add support for | |
109 | DVB device nodes. Add support for Tuner sub-device. | |
110 | ||
111 | ||
112 | :revision: 3.19 / 2014-12-05 (*hv*) | |
113 | ||
114 | Rewrote Colorspace chapter, added new enum | |
115 | :ref:`v4l2_ycbcr_encoding <v4l2-ycbcr-encoding>` and enum | |
116 | :ref:`v4l2_quantization <v4l2-quantization>` fields to struct | |
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117 | :c:type:`v4l2_pix_format`, struct |
118 | :c:type:`v4l2_pix_format_mplane` and struct | |
ffa0441e | 119 | :c:type:`v4l2_mbus_framefmt`. |
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120 | |
121 | ||
122 | :revision: 3.17 / 2014-08-04 (*lp, hv*) | |
123 | ||
e8be7e97 | 124 | Extended struct :c:type:`v4l2_pix_format`. Added |
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125 | format flags. Added compound control types and VIDIOC_QUERY_EXT_CTRL. |
126 | ||
127 | ||
128 | :revision: 3.15 / 2014-02-03 (*hv, ap*) | |
129 | ||
130 | Update several sections of "Common API Elements": "Opening and Closing | |
131 | Devices" "Querying Capabilities", "Application Priority", "Video Inputs | |
132 | and Outputs", "Audio Inputs and Outputs" "Tuners and Modulators", "Video | |
133 | Standards" and "Digital Video (DV) Timings". Added SDR API. | |
134 | ||
135 | ||
136 | :revision: 3.14 / 2013-11-25 (*rr*) | |
137 | ||
138 | Set width and height as unsigned on v4l2_rect. | |
139 | ||
140 | ||
141 | :revision: 3.11 / 2013-05-26 (*hv*) | |
142 | ||
143 | Remove obsolete VIDIOC_DBG_G_CHIP_IDENT ioctl. | |
144 | ||
145 | ||
146 | :revision: 3.10 / 2013-03-25 (*hv*) | |
147 | ||
148 | Remove obsolete and unused DV_PRESET ioctls: VIDIOC_G_DV_PRESET, | |
149 | VIDIOC_S_DV_PRESET, VIDIOC_QUERY_DV_PRESET and | |
150 | VIDIOC_ENUM_DV_PRESET. Remove the related v4l2_input/output | |
151 | capability flags V4L2_IN_CAP_PRESETS and V4L2_OUT_CAP_PRESETS. | |
152 | Added VIDIOC_DBG_G_CHIP_INFO. | |
153 | ||
154 | ||
155 | :revision: 3.9 / 2012-12-03 (*sa, sn*) | |
156 | ||
157 | Added timestamp types to v4l2_buffer. Added | |
158 | V4L2_EVENT_CTRL_CH_RANGE control event changes flag. | |
159 | ||
160 | ||
161 | :revision: 3.6 / 2012-07-02 (*hv*) | |
162 | ||
163 | Added VIDIOC_ENUM_FREQ_BANDS. | |
164 | ||
165 | ||
166 | :revision: 3.5 / 2012-05-07 (*sa, sn, hv*) | |
167 | ||
168 | Added V4L2_CTRL_TYPE_INTEGER_MENU and V4L2 subdev selections API. | |
169 | Improved the description of V4L2_CID_COLORFX control, added | |
170 | V4L2_CID_COLORFX_CBCR control. Added camera controls | |
171 | V4L2_CID_AUTO_EXPOSURE_BIAS, | |
172 | V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE, | |
173 | V4L2_CID_IMAGE_STABILIZATION, V4L2_CID_ISO_SENSITIVITY, | |
174 | V4L2_CID_ISO_SENSITIVITY_AUTO, V4L2_CID_EXPOSURE_METERING, | |
175 | V4L2_CID_SCENE_MODE, V4L2_CID_3A_LOCK, | |
176 | V4L2_CID_AUTO_FOCUS_START, V4L2_CID_AUTO_FOCUS_STOP, | |
177 | V4L2_CID_AUTO_FOCUS_STATUS and V4L2_CID_AUTO_FOCUS_RANGE. Added | |
178 | VIDIOC_ENUM_DV_TIMINGS, VIDIOC_QUERY_DV_TIMINGS and | |
179 | VIDIOC_DV_TIMINGS_CAP. | |
180 | ||
181 | ||
182 | :revision: 3.4 / 2012-01-25 (*sn*) | |
183 | ||
184 | Added :ref:`JPEG compression control class. <jpeg-controls>` | |
185 | ||
186 | ||
187 | :revision: 3.3 / 2012-01-11 (*hv*) | |
188 | ||
189 | Added device_caps field to struct v4l2_capabilities. | |
190 | ||
191 | ||
192 | :revision: 3.2 / 2011-08-26 (*hv*) | |
193 | ||
194 | Added V4L2_CTRL_FLAG_VOLATILE. | |
195 | ||
196 | ||
197 | :revision: 3.1 / 2011-06-27 (*mcc, po, hv*) | |
198 | ||
199 | Documented that VIDIOC_QUERYCAP now returns a per-subsystem version | |
200 | instead of a per-driver one. Standardize an error code for invalid | |
201 | ioctl. Added V4L2_CTRL_TYPE_BITMASK. | |
202 | ||
203 | ||
204 | :revision: 2.6.39 / 2011-03-01 (*mcc, po*) | |
205 | ||
206 | Removed VIDIOC_*_OLD from videodev2.h header and update it to reflect | |
207 | latest changes. Added the :ref:`multi-planar API <planar-apis>`. | |
208 | ||
209 | ||
210 | :revision: 2.6.37 / 2010-08-06 (*hv*) | |
211 | ||
212 | Removed obsolete vtx (videotext) API. | |
213 | ||
214 | ||
215 | :revision: 2.6.33 / 2009-12-03 (*mk*) | |
216 | ||
217 | Added documentation for the Digital Video timings API. | |
218 | ||
219 | ||
220 | :revision: 2.6.32 / 2009-08-31 (*mcc*) | |
221 | ||
222 | Now, revisions will match the kernel version where the V4L2 API changes | |
223 | will be used by the Linux Kernel. Also added Remote Controller chapter. | |
224 | ||
225 | ||
226 | :revision: 0.29 / 2009-08-26 (*ev*) | |
227 | ||
228 | Added documentation for string controls and for FM Transmitter controls. | |
229 | ||
230 | ||
231 | :revision: 0.28 / 2009-08-26 (*gl*) | |
232 | ||
233 | Added V4L2_CID_BAND_STOP_FILTER documentation. | |
234 | ||
235 | ||
236 | :revision: 0.27 / 2009-08-15 (*mcc*) | |
237 | ||
238 | Added libv4l and Remote Controller documentation; added v4l2grab and | |
239 | keytable application examples. | |
240 | ||
241 | ||
242 | :revision: 0.26 / 2009-07-23 (*hv*) | |
243 | ||
244 | Finalized the RDS capture API. Added modulator and RDS encoder | |
245 | capabilities. Added support for string controls. | |
246 | ||
247 | ||
248 | :revision: 0.25 / 2009-01-18 (*hv*) | |
249 | ||
250 | Added pixel formats VYUY, NV16 and NV61, and changed the debug ioctls | |
251 | VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT. Added camera | |
252 | controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE, | |
253 | V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY. | |
254 | ||
255 | ||
256 | :revision: 0.24 / 2008-03-04 (*mhs*) | |
257 | ||
258 | Added pixel formats Y16 and SBGGR16, new controls and a camera controls | |
259 | class. Removed VIDIOC_G/S_MPEGCOMP. | |
260 | ||
261 | ||
262 | :revision: 0.23 / 2007-08-30 (*mhs*) | |
263 | ||
264 | Fixed a typo in VIDIOC_DBG_G/S_REGISTER. Clarified the byte order of | |
265 | packed pixel formats. | |
266 | ||
267 | ||
268 | :revision: 0.22 / 2007-08-29 (*mhs*) | |
269 | ||
270 | Added the Video Output Overlay interface, new MPEG controls, | |
271 | V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT, | |
080df77f | 272 | VIDIOC_DBG_G/S_REGISTER, VIDIOC\_(TRY\_)ENCODER_CMD, |
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273 | VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats. |
274 | Clarifications in the cropping chapter, about RGB pixel formats, the | |
275 | mmap(), poll(), select(), read() and write() functions. Typographical | |
276 | fixes. | |
277 | ||
278 | ||
279 | :revision: 0.21 / 2006-12-19 (*mhs*) | |
280 | ||
281 | Fixed a link in the VIDIOC_G_EXT_CTRLS section. | |
282 | ||
283 | ||
284 | :revision: 0.20 / 2006-11-24 (*mhs*) | |
285 | ||
286 | Clarified the purpose of the audioset field in struct v4l2_input and | |
287 | v4l2_output. | |
288 | ||
289 | ||
290 | :revision: 0.19 / 2006-10-19 (*mhs*) | |
291 | ||
292 | Documented V4L2_PIX_FMT_RGB444. | |
293 | ||
294 | ||
295 | :revision: 0.18 / 2006-10-18 (*mhs*) | |
296 | ||
297 | Added the description of extended controls by Hans Verkuil. Linked | |
298 | V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE. | |
299 | ||
300 | ||
301 | :revision: 0.17 / 2006-10-12 (*mhs*) | |
302 | ||
303 | Corrected V4L2_PIX_FMT_HM12 description. | |
304 | ||
305 | ||
306 | :revision: 0.16 / 2006-10-08 (*mhs*) | |
307 | ||
308 | VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS are now part | |
309 | of the API. | |
310 | ||
311 | ||
312 | :revision: 0.15 / 2006-09-23 (*mhs*) | |
313 | ||
314 | Cleaned up the bibliography, added BT.653 and BT.1119. | |
315 | capture.c/start_capturing() for user pointer I/O did not initialize the | |
316 | buffer index. Documented the V4L MPEG and MJPEG VID_TYPEs and | |
317 | V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel formats. See | |
318 | the history chapter for API changes. | |
319 | ||
320 | ||
321 | :revision: 0.14 / 2006-09-14 (*mr*) | |
322 | ||
323 | Added VIDIOC_ENUM_FRAMESIZES and VIDIOC_ENUM_FRAMEINTERVALS proposal | |
324 | for frame format enumeration of digital devices. | |
325 | ||
326 | ||
327 | :revision: 0.13 / 2006-04-07 (*mhs*) | |
328 | ||
080df77f | 329 | Corrected the description of struct v4l2_window clips. New V4L2_STD\_ |
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330 | and V4L2_TUNER_MODE_LANG1_LANG2 defines. |
331 | ||
332 | ||
333 | :revision: 0.12 / 2006-02-03 (*mhs*) | |
334 | ||
335 | Corrected the description of struct v4l2_captureparm and | |
336 | v4l2_outputparm. | |
337 | ||
338 | ||
339 | :revision: 0.11 / 2006-01-27 (*mhs*) | |
340 | ||
341 | Improved the description of struct v4l2_tuner. | |
342 | ||
343 | ||
344 | :revision: 0.10 / 2006-01-10 (*mhs*) | |
345 | ||
346 | VIDIOC_G_INPUT and VIDIOC_S_PARM clarifications. | |
347 | ||
348 | ||
349 | :revision: 0.9 / 2005-11-27 (*mhs*) | |
350 | ||
351 | Improved the 525 line numbering diagram. Hans Verkuil and I rewrote the | |
352 | sliced VBI section. He also contributed a VIDIOC_LOG_STATUS page. | |
353 | Fixed VIDIOC_S_STD call in the video standard selection example. | |
354 | Various updates. | |
355 | ||
356 | ||
357 | :revision: 0.8 / 2004-10-04 (*mhs*) | |
358 | ||
359 | Somehow a piece of junk slipped into the capture example, removed. | |
360 | ||
361 | ||
362 | :revision: 0.7 / 2004-09-19 (*mhs*) | |
363 | ||
364 | Fixed video standard selection, control enumeration, downscaling and | |
365 | aspect example. Added read and user pointer i/o to video capture | |
366 | example. | |
367 | ||
368 | ||
369 | :revision: 0.6 / 2004-08-01 (*mhs*) | |
370 | ||
371 | v4l2_buffer changes, added video capture example, various corrections. | |
372 | ||
373 | ||
374 | :revision: 0.5 / 2003-11-05 (*mhs*) | |
375 | ||
376 | Pixel format erratum. | |
377 | ||
378 | ||
379 | :revision: 0.4 / 2003-09-17 (*mhs*) | |
380 | ||
381 | Corrected source and Makefile to generate a PDF. SGML fixes. Added | |
382 | latest API changes. Closed gaps in the history chapter. | |
383 | ||
384 | ||
385 | :revision: 0.3 / 2003-02-05 (*mhs*) | |
386 | ||
387 | Another draft, more corrections. | |
388 | ||
389 | ||
390 | :revision: 0.2 / 2003-01-15 (*mhs*) | |
391 | ||
392 | Second draft, with corrections pointed out by Gerd Knorr. | |
393 | ||
394 | ||
395 | :revision: 0.1 / 2002-12-01 (*mhs*) | |
396 | ||
397 | First draft, based on documentation by Bill Dirks and discussions on the | |
398 | V4L mailing list. |