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Based on kernel version 3.9. Page generated on 2013-05-02 23:03 EST.
1 <section id="control"> 2 <title>User Controls</title> 3 4 <para>Devices typically have a number of user-settable controls 5 such as brightness, saturation and so on, which would be presented to 6 the user on a graphical user interface. But, different devices 7 will have different controls available, and furthermore, the range of 8 possible values, and the default value will vary from device to 9 device. The control ioctls provide the information and a mechanism to 10 create a nice user interface for these controls that will work 11 correctly with any device.</para> 12 13 <para>All controls are accessed using an ID value. V4L2 defines 14 several IDs for specific purposes. Drivers can also implement their 15 own custom controls using <constant>V4L2_CID_PRIVATE_BASE</constant> 16 and higher values. The pre-defined control IDs have the prefix 17 <constant>V4L2_CID_</constant>, and are listed in <xref 18 linkend="control-id" />. The ID is used when querying the attributes of 19 a control, and when getting or setting the current value.</para> 20 21 <para>Generally applications should present controls to the user 22 without assumptions about their purpose. Each control comes with a 23 name string the user is supposed to understand. When the purpose is 24 non-intuitive the driver writer should provide a user manual, a user 25 interface plug-in or a driver specific panel application. Predefined 26 IDs were introduced to change a few controls programmatically, for 27 example to mute a device during a channel switch.</para> 28 29 <para>Drivers may enumerate different controls after switching 30 the current video input or output, tuner or modulator, or audio input 31 or output. Different in the sense of other bounds, another default and 32 current value, step size or other menu items. A control with a certain 33 <emphasis>custom</emphasis> ID can also change name and 34 type.<footnote> 35 <para>It will be more convenient for applications if drivers 36 make use of the <constant>V4L2_CTRL_FLAG_DISABLED</constant> flag, but 37 that was never required.</para> 38 </footnote> Control values are stored globally, they do not 39 change when switching except to stay within the reported bounds. They 40 also do not change ⪚ when the device is opened or closed, when the 41 tuner radio frequency is changed or generally never without 42 application request. Since V4L2 specifies no event mechanism, panel 43 applications intended to cooperate with other panel applications (be 44 they built into a larger application, as a TV viewer) may need to 45 regularly poll control values to update their user 46 interface.<footnote> 47 <para>Applications could call an ioctl to request events. 48 After another process called &VIDIOC-S-CTRL; or another ioctl changing 49 shared properties the &func-select; function would indicate 50 readability until any ioctl (querying the properties) is 51 called.</para> 52 </footnote></para> 53 54 <para> 55 All controls use machine endianness. 56 </para> 57 58 <table pgwide="1" frame="none" id="control-id"> 59 <title>Control IDs</title> 60 <tgroup cols="3"> 61 &cs-def; 62 <thead> 63 <row> 64 <entry>ID</entry> 65 <entry>Type</entry> 66 <entry>Description</entry> 67 </row> 68 </thead> 69 <tbody valign="top"> 70 <row> 71 <entry><constant>V4L2_CID_BASE</constant></entry> 72 <entry></entry> 73 <entry>First predefined ID, equal to 74 <constant>V4L2_CID_BRIGHTNESS</constant>.</entry> 75 </row> 76 <row> 77 <entry><constant>V4L2_CID_USER_BASE</constant></entry> 78 <entry></entry> 79 <entry>Synonym of <constant>V4L2_CID_BASE</constant>.</entry> 80 </row> 81 <row> 82 <entry><constant>V4L2_CID_BRIGHTNESS</constant></entry> 83 <entry>integer</entry> 84 <entry>Picture brightness, or more precisely, the black 85 level.</entry> 86 </row> 87 <row> 88 <entry><constant>V4L2_CID_CONTRAST</constant></entry> 89 <entry>integer</entry> 90 <entry>Picture contrast or luma gain.</entry> 91 </row> 92 <row> 93 <entry><constant>V4L2_CID_SATURATION</constant></entry> 94 <entry>integer</entry> 95 <entry>Picture color saturation or chroma gain.</entry> 96 </row> 97 <row> 98 <entry><constant>V4L2_CID_HUE</constant></entry> 99 <entry>integer</entry> 100 <entry>Hue or color balance.</entry> 101 </row> 102 <row> 103 <entry><constant>V4L2_CID_AUDIO_VOLUME</constant></entry> 104 <entry>integer</entry> 105 <entry>Overall audio volume. Note some drivers also 106 provide an OSS or ALSA mixer interface.</entry> 107 </row> 108 <row> 109 <entry><constant>V4L2_CID_AUDIO_BALANCE</constant></entry> 110 <entry>integer</entry> 111 <entry>Audio stereo balance. Minimum corresponds to all 112 the way left, maximum to right.</entry> 113 </row> 114 <row> 115 <entry><constant>V4L2_CID_AUDIO_BASS</constant></entry> 116 <entry>integer</entry> 117 <entry>Audio bass adjustment.</entry> 118 </row> 119 <row> 120 <entry><constant>V4L2_CID_AUDIO_TREBLE</constant></entry> 121 <entry>integer</entry> 122 <entry>Audio treble adjustment.</entry> 123 </row> 124 <row> 125 <entry><constant>V4L2_CID_AUDIO_MUTE</constant></entry> 126 <entry>boolean</entry> 127 <entry>Mute audio, &ie; set the volume to zero, however 128 without affecting <constant>V4L2_CID_AUDIO_VOLUME</constant>. Like 129 ALSA drivers, V4L2 drivers must mute at load time to avoid excessive 130 noise. Actually the entire device should be reset to a low power 131 consumption state.</entry> 132 </row> 133 <row> 134 <entry><constant>V4L2_CID_AUDIO_LOUDNESS</constant></entry> 135 <entry>boolean</entry> 136 <entry>Loudness mode (bass boost).</entry> 137 </row> 138 <row> 139 <entry><constant>V4L2_CID_BLACK_LEVEL</constant></entry> 140 <entry>integer</entry> 141 <entry>Another name for brightness (not a synonym of 142 <constant>V4L2_CID_BRIGHTNESS</constant>). This control is deprecated 143 and should not be used in new drivers and applications.</entry> 144 </row> 145 <row> 146 <entry><constant>V4L2_CID_AUTO_WHITE_BALANCE</constant></entry> 147 <entry>boolean</entry> 148 <entry>Automatic white balance (cameras).</entry> 149 </row> 150 <row> 151 <entry><constant>V4L2_CID_DO_WHITE_BALANCE</constant></entry> 152 <entry>button</entry> 153 <entry>This is an action control. When set (the value is 154 ignored), the device will do a white balance and then hold the current 155 setting. Contrast this with the boolean 156 <constant>V4L2_CID_AUTO_WHITE_BALANCE</constant>, which, when 157 activated, keeps adjusting the white balance.</entry> 158 </row> 159 <row> 160 <entry><constant>V4L2_CID_RED_BALANCE</constant></entry> 161 <entry>integer</entry> 162 <entry>Red chroma balance.</entry> 163 </row> 164 <row> 165 <entry><constant>V4L2_CID_BLUE_BALANCE</constant></entry> 166 <entry>integer</entry> 167 <entry>Blue chroma balance.</entry> 168 </row> 169 <row> 170 <entry><constant>V4L2_CID_GAMMA</constant></entry> 171 <entry>integer</entry> 172 <entry>Gamma adjust.</entry> 173 </row> 174 <row> 175 <entry><constant>V4L2_CID_WHITENESS</constant></entry> 176 <entry>integer</entry> 177 <entry>Whiteness for grey-scale devices. This is a synonym 178 for <constant>V4L2_CID_GAMMA</constant>. This control is deprecated 179 and should not be used in new drivers and applications.</entry> 180 </row> 181 <row> 182 <entry><constant>V4L2_CID_EXPOSURE</constant></entry> 183 <entry>integer</entry> 184 <entry>Exposure (cameras). [Unit?]</entry> 185 </row> 186 <row> 187 <entry><constant>V4L2_CID_AUTOGAIN</constant></entry> 188 <entry>boolean</entry> 189 <entry>Automatic gain/exposure control.</entry> 190 </row> 191 <row> 192 <entry><constant>V4L2_CID_GAIN</constant></entry> 193 <entry>integer</entry> 194 <entry>Gain control.</entry> 195 </row> 196 <row> 197 <entry><constant>V4L2_CID_HFLIP</constant></entry> 198 <entry>boolean</entry> 199 <entry>Mirror the picture horizontally.</entry> 200 </row> 201 <row> 202 <entry><constant>V4L2_CID_VFLIP</constant></entry> 203 <entry>boolean</entry> 204 <entry>Mirror the picture vertically.</entry> 205 </row> 206 <row id="v4l2-power-line-frequency"> 207 <entry><constant>V4L2_CID_POWER_LINE_FREQUENCY</constant></entry> 208 <entry>enum</entry> 209 <entry>Enables a power line frequency filter to avoid 210 flicker. Possible values for <constant>enum v4l2_power_line_frequency</constant> are: 211 <constant>V4L2_CID_POWER_LINE_FREQUENCY_DISABLED</constant> (0), 212 <constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1), 213 <constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2) and 214 <constant>V4L2_CID_POWER_LINE_FREQUENCY_AUTO</constant> (3).</entry> 215 </row> 216 <row> 217 <entry><constant>V4L2_CID_HUE_AUTO</constant></entry> 218 <entry>boolean</entry> 219 <entry>Enables automatic hue control by the device. The 220 effect of setting <constant>V4L2_CID_HUE</constant> while automatic 221 hue control is enabled is undefined, drivers should ignore such 222 request.</entry> 223 </row> 224 <row> 225 <entry><constant>V4L2_CID_WHITE_BALANCE_TEMPERATURE</constant></entry> 226 <entry>integer</entry> 227 <entry>This control specifies the white balance settings 228 as a color temperature in Kelvin. A driver should have a minimum of 229 2800 (incandescent) to 6500 (daylight). For more information about 230 color temperature see <ulink 231 url="http://en.wikipedia.org/wiki/Color_temperature">Wikipedia</ulink>.</entry> 232 </row> 233 <row> 234 <entry><constant>V4L2_CID_SHARPNESS</constant></entry> 235 <entry>integer</entry> 236 <entry>Adjusts the sharpness filters in a camera. The 237 minimum value disables the filters, higher values give a sharper 238 picture.</entry> 239 </row> 240 <row> 241 <entry><constant>V4L2_CID_BACKLIGHT_COMPENSATION</constant></entry> 242 <entry>integer</entry> 243 <entry>Adjusts the backlight compensation in a camera. The 244 minimum value disables backlight compensation.</entry> 245 </row> 246 <row> 247 <entry><constant>V4L2_CID_CHROMA_AGC</constant></entry> 248 <entry>boolean</entry> 249 <entry>Chroma automatic gain control.</entry> 250 </row> 251 <row> 252 <entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry> 253 <entry>integer</entry> 254 <entry>Adjusts the Chroma gain control (for use when chroma AGC 255 is disabled).</entry> 256 </row> 257 <row> 258 <entry><constant>V4L2_CID_COLOR_KILLER</constant></entry> 259 <entry>boolean</entry> 260 <entry>Enable the color killer (&ie; force a black & white image in case of a weak video signal).</entry> 261 </row> 262 <row id="v4l2-colorfx"> 263 <entry><constant>V4L2_CID_COLORFX</constant></entry> 264 <entry>enum</entry> 265 <entry>Selects a color effect. The following values are defined: 266 </entry> 267 </row><row> 268 <entry></entry> 269 <entry></entry> 270 <entrytbl spanname="descr" cols="2"> 271 <tbody valign="top"> 272 <row> 273 <entry><constant>V4L2_COLORFX_NONE</constant> </entry> 274 <entry>Color effect is disabled.</entry> 275 </row> 276 <row> 277 <entry><constant>V4L2_COLORFX_ANTIQUE</constant> </entry> 278 <entry>An aging (old photo) effect.</entry> 279 </row> 280 <row> 281 <entry><constant>V4L2_COLORFX_ART_FREEZE</constant> </entry> 282 <entry>Frost color effect.</entry> 283 </row> 284 <row> 285 <entry><constant>V4L2_COLORFX_AQUA</constant> </entry> 286 <entry>Water color, cool tone.</entry> 287 </row> 288 <row> 289 <entry><constant>V4L2_COLORFX_BW</constant> </entry> 290 <entry>Black and white.</entry> 291 </row> 292 <row> 293 <entry><constant>V4L2_COLORFX_EMBOSS</constant> </entry> 294 <entry>Emboss, the highlights and shadows replace light/dark boundaries 295 and low contrast areas are set to a gray background.</entry> 296 </row> 297 <row> 298 <entry><constant>V4L2_COLORFX_GRASS_GREEN</constant> </entry> 299 <entry>Grass green.</entry> 300 </row> 301 <row> 302 <entry><constant>V4L2_COLORFX_NEGATIVE</constant> </entry> 303 <entry>Negative.</entry> 304 </row> 305 <row> 306 <entry><constant>V4L2_COLORFX_SEPIA</constant> </entry> 307 <entry>Sepia tone.</entry> 308 </row> 309 <row> 310 <entry><constant>V4L2_COLORFX_SKETCH</constant> </entry> 311 <entry>Sketch.</entry> 312 </row> 313 <row> 314 <entry><constant>V4L2_COLORFX_SKIN_WHITEN</constant> </entry> 315 <entry>Skin whiten.</entry> 316 </row> 317 <row> 318 <entry><constant>V4L2_COLORFX_SKY_BLUE</constant> </entry> 319 <entry>Sky blue.</entry> 320 </row> 321 <row> 322 <entry><constant>V4L2_COLORFX_SOLARIZATION</constant> </entry> 323 <entry>Solarization, the image is partially reversed in tone, 324 only color values above or below a certain threshold are inverted. 325 </entry> 326 </row> 327 <row> 328 <entry><constant>V4L2_COLORFX_SILHOUETTE</constant> </entry> 329 <entry>Silhouette (outline).</entry> 330 </row> 331 <row> 332 <entry><constant>V4L2_COLORFX_VIVID</constant> </entry> 333 <entry>Vivid colors.</entry> 334 </row> 335 <row> 336 <entry><constant>V4L2_COLORFX_SET_CBCR</constant> </entry> 337 <entry>The Cb and Cr chroma components are replaced by fixed 338 coefficients determined by <constant>V4L2_CID_COLORFX_CBCR</constant> 339 control.</entry> 340 </row> 341 </tbody> 342 </entrytbl> 343 </row> 344 <row> 345 <entry><constant>V4L2_CID_COLORFX_CBCR</constant></entry> 346 <entry>integer</entry> 347 <entry>Determines the Cb and Cr coefficients for <constant>V4L2_COLORFX_SET_CBCR</constant> 348 color effect. Bits [7:0] of the supplied 32 bit value are interpreted as 349 Cr component, bits [15:8] as Cb component and bits [31:16] must be zero. 350 </entry> 351 </row> 352 <row> 353 <entry><constant>V4L2_CID_AUTOBRIGHTNESS</constant></entry> 354 <entry>boolean</entry> 355 <entry>Enable Automatic Brightness.</entry> 356 </row> 357 <row> 358 <entry><constant>V4L2_CID_ROTATE</constant></entry> 359 <entry>integer</entry> 360 <entry>Rotates the image by specified angle. Common angles are 90, 361 270 and 180. Rotating the image to 90 and 270 will reverse the height 362 and width of the display window. It is necessary to set the new height and 363 width of the picture using the &VIDIOC-S-FMT; ioctl according to 364 the rotation angle selected.</entry> 365 </row> 366 <row> 367 <entry><constant>V4L2_CID_BG_COLOR</constant></entry> 368 <entry>integer</entry> 369 <entry>Sets the background color on the current output device. 370 Background color needs to be specified in the RGB24 format. The 371 supplied 32 bit value is interpreted as bits 0-7 Red color information, 372 bits 8-15 Green color information, bits 16-23 Blue color 373 information and bits 24-31 must be zero.</entry> 374 </row> 375 <row> 376 <entry><constant>V4L2_CID_ILLUMINATORS_1</constant> 377 <constant>V4L2_CID_ILLUMINATORS_2</constant></entry> 378 <entry>boolean</entry> 379 <entry>Switch on or off the illuminator 1 or 2 of the device 380 (usually a microscope).</entry> 381 </row> 382 <row> 383 <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry> 384 <entry>integer</entry> 385 <entry>This is a read-only control that can be read by the application 386 and used as a hint to determine the number of CAPTURE buffers to pass to REQBUFS. 387 The value is the minimum number of CAPTURE buffers that is necessary for hardware 388 to work.</entry> 389 </row> 390 <row> 391 <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_OUTPUT</constant></entry> 392 <entry>integer</entry> 393 <entry>This is a read-only control that can be read by the application 394 and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS. 395 The value is the minimum number of OUTPUT buffers that is necessary for hardware 396 to work.</entry> 397 </row> 398 <row id="v4l2-alpha-component"> 399 <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry> 400 <entry>integer</entry> 401 <entry> Sets the alpha color component on the capture device or on 402 the capture buffer queue of a mem-to-mem device. When a mem-to-mem 403 device produces frame format that includes an alpha component 404 (e.g. <link linkend="rgb-formats">packed RGB image formats</link>) 405 and the alpha value is not defined by the mem-to-mem input data 406 this control lets you select the alpha component value of all 407 pixels. It is applicable to any pixel format that contains an alpha 408 component. 409 </entry> 410 </row> 411 <row> 412 <entry><constant>V4L2_CID_LASTP1</constant></entry> 413 <entry></entry> 414 <entry>End of the predefined control IDs (currently 415 <constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry> 416 </row> 417 <row> 418 <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry> 419 <entry></entry> 420 <entry>ID of the first custom (driver specific) control. 421 Applications depending on particular custom controls should check the 422 driver name and version, see <xref linkend="querycap" />.</entry> 423 </row> 424 </tbody> 425 </tgroup> 426 </table> 427 428 <para>Applications can enumerate the available controls with the 429 &VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls, get and set a 430 control value with the &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls. 431 Drivers must implement <constant>VIDIOC_QUERYCTRL</constant>, 432 <constant>VIDIOC_G_CTRL</constant> and 433 <constant>VIDIOC_S_CTRL</constant> when the device has one or more 434 controls, <constant>VIDIOC_QUERYMENU</constant> when it has one or 435 more menu type controls.</para> 436 437 <example> 438 <title>Enumerating all controls</title> 439 440 <programlisting> 441 &v4l2-queryctrl; queryctrl; 442 &v4l2-querymenu; querymenu; 443 444 static void 445 enumerate_menu (void) 446 { 447 printf (" Menu items:\n"); 448 449 memset (&querymenu, 0, sizeof (querymenu)); 450 querymenu.id = queryctrl.id; 451 452 for (querymenu.index = queryctrl.minimum; 453 querymenu.index <= queryctrl.maximum; 454 querymenu.index++) { 455 if (0 == ioctl (fd, &VIDIOC-QUERYMENU;, &querymenu)) { 456 printf (" %s\n", querymenu.name); 457 } 458 } 459 } 460 461 memset (&queryctrl, 0, sizeof (queryctrl)); 462 463 for (queryctrl.id = V4L2_CID_BASE; 464 queryctrl.id < V4L2_CID_LASTP1; 465 queryctrl.id++) { 466 if (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { 467 if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) 468 continue; 469 470 printf ("Control %s\n", queryctrl.name); 471 472 if (queryctrl.type == V4L2_CTRL_TYPE_MENU) 473 enumerate_menu (); 474 } else { 475 if (errno == EINVAL) 476 continue; 477 478 perror ("VIDIOC_QUERYCTRL"); 479 exit (EXIT_FAILURE); 480 } 481 } 482 483 for (queryctrl.id = V4L2_CID_PRIVATE_BASE;; 484 queryctrl.id++) { 485 if (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { 486 if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) 487 continue; 488 489 printf ("Control %s\n", queryctrl.name); 490 491 if (queryctrl.type == V4L2_CTRL_TYPE_MENU) 492 enumerate_menu (); 493 } else { 494 if (errno == EINVAL) 495 break; 496 497 perror ("VIDIOC_QUERYCTRL"); 498 exit (EXIT_FAILURE); 499 } 500 } 501 </programlisting> 502 </example> 503 504 <example> 505 <title>Changing controls</title> 506 507 <programlisting> 508 &v4l2-queryctrl; queryctrl; 509 &v4l2-control; control; 510 511 memset (&queryctrl, 0, sizeof (queryctrl)); 512 queryctrl.id = V4L2_CID_BRIGHTNESS; 513 514 if (-1 == ioctl (fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { 515 if (errno != EINVAL) { 516 perror ("VIDIOC_QUERYCTRL"); 517 exit (EXIT_FAILURE); 518 } else { 519 printf ("V4L2_CID_BRIGHTNESS is not supported\n"); 520 } 521 } else if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) { 522 printf ("V4L2_CID_BRIGHTNESS is not supported\n"); 523 } else { 524 memset (&control, 0, sizeof (control)); 525 control.id = V4L2_CID_BRIGHTNESS; 526 control.value = queryctrl.default_value; 527 528 if (-1 == ioctl (fd, &VIDIOC-S-CTRL;, &control)) { 529 perror ("VIDIOC_S_CTRL"); 530 exit (EXIT_FAILURE); 531 } 532 } 533 534 memset (&control, 0, sizeof (control)); 535 control.id = V4L2_CID_CONTRAST; 536 537 if (0 == ioctl (fd, &VIDIOC-G-CTRL;, &control)) { 538 control.value += 1; 539 540 /* The driver may clamp the value or return ERANGE, ignored here */ 541 542 if (-1 == ioctl (fd, &VIDIOC-S-CTRL;, &control) 543 && errno != ERANGE) { 544 perror ("VIDIOC_S_CTRL"); 545 exit (EXIT_FAILURE); 546 } 547 /* Ignore if V4L2_CID_CONTRAST is unsupported */ 548 } else if (errno != EINVAL) { 549 perror ("VIDIOC_G_CTRL"); 550 exit (EXIT_FAILURE); 551 } 552 553 control.id = V4L2_CID_AUDIO_MUTE; 554 control.value = TRUE; /* silence */ 555 556 /* Errors ignored */ 557 ioctl (fd, VIDIOC_S_CTRL, &control); 558 </programlisting> 559 </example> 560 </section> 561 562 <section id="extended-controls"> 563 <title>Extended Controls</title> 564 565 <section> 566 <title>Introduction</title> 567 568 <para>The control mechanism as originally designed was meant 569 to be used for user settings (brightness, saturation, etc). However, 570 it turned out to be a very useful model for implementing more 571 complicated driver APIs where each driver implements only a subset of 572 a larger API.</para> 573 574 <para>The MPEG encoding API was the driving force behind 575 designing and implementing this extended control mechanism: the MPEG 576 standard is quite large and the currently supported hardware MPEG 577 encoders each only implement a subset of this standard. Further more, 578 many parameters relating to how the video is encoded into an MPEG 579 stream are specific to the MPEG encoding chip since the MPEG standard 580 only defines the format of the resulting MPEG stream, not how the 581 video is actually encoded into that format.</para> 582 583 <para>Unfortunately, the original control API lacked some 584 features needed for these new uses and so it was extended into the 585 (not terribly originally named) extended control API.</para> 586 587 <para>Even though the MPEG encoding API was the first effort 588 to use the Extended Control API, nowadays there are also other classes 589 of Extended Controls, such as Camera Controls and FM Transmitter Controls. 590 The Extended Controls API as well as all Extended Controls classes are 591 described in the following text.</para> 592 </section> 593 594 <section> 595 <title>The Extended Control API</title> 596 597 <para>Three new ioctls are available: &VIDIOC-G-EXT-CTRLS;, 598 &VIDIOC-S-EXT-CTRLS; and &VIDIOC-TRY-EXT-CTRLS;. These ioctls act on 599 arrays of controls (as opposed to the &VIDIOC-G-CTRL; and 600 &VIDIOC-S-CTRL; ioctls that act on a single control). This is needed 601 since it is often required to atomically change several controls at 602 once.</para> 603 604 <para>Each of the new ioctls expects a pointer to a 605 &v4l2-ext-controls;. This structure contains a pointer to the control 606 array, a count of the number of controls in that array and a control 607 class. Control classes are used to group similar controls into a 608 single class. For example, control class 609 <constant>V4L2_CTRL_CLASS_USER</constant> contains all user controls 610 (&ie; all controls that can also be set using the old 611 <constant>VIDIOC_S_CTRL</constant> ioctl). Control class 612 <constant>V4L2_CTRL_CLASS_MPEG</constant> contains all controls 613 relating to MPEG encoding, etc.</para> 614 615 <para>All controls in the control array must belong to the 616 specified control class. An error is returned if this is not the 617 case.</para> 618 619 <para>It is also possible to use an empty control array (count 620 == 0) to check whether the specified control class is 621 supported.</para> 622 623 <para>The control array is a &v4l2-ext-control; array. The 624 <structname>v4l2_ext_control</structname> structure is very similar to 625 &v4l2-control;, except for the fact that it also allows for 64-bit 626 values and pointers to be passed.</para> 627 628 <para>It is important to realize that due to the flexibility of 629 controls it is necessary to check whether the control you want to set 630 actually is supported in the driver and what the valid range of values 631 is. So use the &VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls to 632 check this. Also note that it is possible that some of the menu 633 indices in a control of type <constant>V4L2_CTRL_TYPE_MENU</constant> 634 may not be supported (<constant>VIDIOC_QUERYMENU</constant> will 635 return an error). A good example is the list of supported MPEG audio 636 bitrates. Some drivers only support one or two bitrates, others 637 support a wider range.</para> 638 639 <para> 640 All controls use machine endianness. 641 </para> 642 </section> 643 644 <section> 645 <title>Enumerating Extended Controls</title> 646 647 <para>The recommended way to enumerate over the extended 648 controls is by using &VIDIOC-QUERYCTRL; in combination with the 649 <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag:</para> 650 651 <informalexample> 652 <programlisting> 653 &v4l2-queryctrl; qctrl; 654 655 qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL; 656 while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &qctrl)) { 657 /* ... */ 658 qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; 659 } 660 </programlisting> 661 </informalexample> 662 663 <para>The initial control ID is set to 0 ORed with the 664 <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag. The 665 <constant>VIDIOC_QUERYCTRL</constant> ioctl will return the first 666 control with a higher ID than the specified one. When no such controls 667 are found an error is returned.</para> 668 669 <para>If you want to get all controls within a specific control 670 class, then you can set the initial 671 <structfield>qctrl.id</structfield> value to the control class and add 672 an extra check to break out of the loop when a control of another 673 control class is found:</para> 674 675 <informalexample> 676 <programlisting> 677 qctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CTRL_FLAG_NEXT_CTRL; 678 while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &qctrl)) { 679 if (V4L2_CTRL_ID2CLASS (qctrl.id) != V4L2_CTRL_CLASS_MPEG) 680 break; 681 /* ... */ 682 qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; 683 } 684 </programlisting> 685 </informalexample> 686 687 <para>The 32-bit <structfield>qctrl.id</structfield> value is 688 subdivided into three bit ranges: the top 4 bits are reserved for 689 flags (⪚ <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>) and are not 690 actually part of the ID. The remaining 28 bits form the control ID, of 691 which the most significant 12 bits define the control class and the 692 least significant 16 bits identify the control within the control 693 class. It is guaranteed that these last 16 bits are always non-zero 694 for controls. The range of 0x1000 and up are reserved for 695 driver-specific controls. The macro 696 <constant>V4L2_CTRL_ID2CLASS(id)</constant> returns the control class 697 ID based on a control ID.</para> 698 699 <para>If the driver does not support extended controls, then 700 <constant>VIDIOC_QUERYCTRL</constant> will fail when used in 701 combination with <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>. In 702 that case the old method of enumerating control should be used (see 703 1.8). But if it is supported, then it is guaranteed to enumerate over 704 all controls, including driver-private controls.</para> 705 </section> 706 707 <section> 708 <title>Creating Control Panels</title> 709 710 <para>It is possible to create control panels for a graphical 711 user interface where the user can select the various controls. 712 Basically you will have to iterate over all controls using the method 713 described above. Each control class starts with a control of type 714 <constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant>. 715 <constant>VIDIOC_QUERYCTRL</constant> will return the name of this 716 control class which can be used as the title of a tab page within a 717 control panel.</para> 718 719 <para>The flags field of &v4l2-queryctrl; also contains hints on 720 the behavior of the control. See the &VIDIOC-QUERYCTRL; documentation 721 for more details.</para> 722 </section> 723 724 <section id="mpeg-controls"> 725 <title>MPEG Control Reference</title> 726 727 <para>Below all controls within the MPEG control class are 728 described. First the generic controls, then controls specific for 729 certain hardware.</para> 730 731 <section> 732 <title>Generic MPEG Controls</title> 733 734 <table pgwide="1" frame="none" id="mpeg-control-id"> 735 <title>MPEG Control IDs</title> 736 <tgroup cols="4"> 737 <colspec colname="c1" colwidth="1*" /> 738 <colspec colname="c2" colwidth="6*" /> 739 <colspec colname="c3" colwidth="2*" /> 740 <colspec colname="c4" colwidth="6*" /> 741 <spanspec namest="c1" nameend="c2" spanname="id" /> 742 <spanspec namest="c2" nameend="c4" spanname="descr" /> 743 <thead> 744 <row> 745 <entry spanname="id" align="left">ID</entry> 746 <entry align="left">Type</entry> 747 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 748 </row> 749 </thead> 750 <tbody valign="top"> 751 <row><entry></entry></row> 752 <row> 753 <entry spanname="id"><constant>V4L2_CID_MPEG_CLASS</constant> </entry> 754 <entry>class</entry> 755 </row><row><entry spanname="descr">The MPEG class 756 descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a 757 description of this control class. This description can be used as the 758 caption of a Tab page in a GUI, for example.</entry> 759 </row> 760 <row><entry></entry></row> 761 <row id="v4l2-mpeg-stream-type"> 762 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_TYPE</constant> </entry> 763 <entry>enum v4l2_mpeg_stream_type</entry> 764 </row><row><entry spanname="descr">The MPEG-1, -2 or -4 765 output stream type. One cannot assume anything here. Each hardware 766 MPEG encoder tends to support different subsets of the available MPEG 767 stream types. This control is specific to multiplexed MPEG streams. 768 The currently defined stream types are:</entry> 769 </row> 770 <row> 771 <entrytbl spanname="descr" cols="2"> 772 <tbody valign="top"> 773 <row> 774 <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_PS</constant> </entry> 775 <entry>MPEG-2 program stream</entry> 776 </row> 777 <row> 778 <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_TS</constant> </entry> 779 <entry>MPEG-2 transport stream</entry> 780 </row> 781 <row> 782 <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_SS</constant> </entry> 783 <entry>MPEG-1 system stream</entry> 784 </row> 785 <row> 786 <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_DVD</constant> </entry> 787 <entry>MPEG-2 DVD-compatible stream</entry> 788 </row> 789 <row> 790 <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_VCD</constant> </entry> 791 <entry>MPEG-1 VCD-compatible stream</entry> 792 </row> 793 <row> 794 <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD</constant> </entry> 795 <entry>MPEG-2 SVCD-compatible stream</entry> 796 </row> 797 </tbody> 798 </entrytbl> 799 </row> 800 <row><entry></entry></row> 801 <row> 802 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PMT</constant> </entry> 803 <entry>integer</entry> 804 </row><row><entry spanname="descr">Program Map Table 805 Packet ID for the MPEG transport stream (default 16)</entry> 806 </row> 807 <row><entry></entry></row> 808 <row> 809 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_AUDIO</constant> </entry> 810 <entry>integer</entry> 811 </row><row><entry spanname="descr">Audio Packet ID for 812 the MPEG transport stream (default 256)</entry> 813 </row> 814 <row><entry></entry></row> 815 <row> 816 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_VIDEO</constant> </entry> 817 <entry>integer</entry> 818 </row><row><entry spanname="descr">Video Packet ID for 819 the MPEG transport stream (default 260)</entry> 820 </row> 821 <row><entry></entry></row> 822 <row> 823 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PCR</constant> </entry> 824 <entry>integer</entry> 825 </row><row><entry spanname="descr">Packet ID for the 826 MPEG transport stream carrying PCR fields (default 259)</entry> 827 </row> 828 <row><entry></entry></row> 829 <row> 830 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_AUDIO</constant> </entry> 831 <entry>integer</entry> 832 </row><row><entry spanname="descr">Audio ID for MPEG 833 PES</entry> 834 </row> 835 <row><entry></entry></row> 836 <row> 837 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_VIDEO</constant> </entry> 838 <entry>integer</entry> 839 </row><row><entry spanname="descr">Video ID for MPEG 840 PES</entry> 841 </row> 842 <row><entry></entry></row> 843 <row id="v4l2-mpeg-stream-vbi-fmt"> 844 <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_VBI_FMT</constant> </entry> 845 <entry>enum v4l2_mpeg_stream_vbi_fmt</entry> 846 </row><row><entry spanname="descr">Some cards can embed 847 VBI data (⪚ Closed Caption, Teletext) into the MPEG stream. This 848 control selects whether VBI data should be embedded, and if so, what 849 embedding method should be used. The list of possible VBI formats 850 depends on the driver. The currently defined VBI format types 851 are:</entry> 852 </row> 853 <row> 854 <entrytbl spanname="descr" cols="2"> 855 <tbody valign="top"> 856 <row> 857 <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_NONE</constant> </entry> 858 <entry>No VBI in the MPEG stream</entry> 859 </row> 860 <row> 861 <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant> </entry> 862 <entry>VBI in private packets, IVTV format (documented 863 in the kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.vbi</filename>)</entry> 864 </row> 865 </tbody> 866 </entrytbl> 867 </row> 868 <row><entry></entry></row> 869 <row id="v4l2-mpeg-audio-sampling-freq"> 870 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ</constant> </entry> 871 <entry>enum v4l2_mpeg_audio_sampling_freq</entry> 872 </row><row><entry spanname="descr">MPEG Audio sampling 873 frequency. Possible values are:</entry> 874 </row> 875 <row> 876 <entrytbl spanname="descr" cols="2"> 877 <tbody valign="top"> 878 <row> 879 <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100</constant> </entry> 880 <entry>44.1 kHz</entry> 881 </row> 882 <row> 883 <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000</constant> </entry> 884 <entry>48 kHz</entry> 885 </row> 886 <row> 887 <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000</constant> </entry> 888 <entry>32 kHz</entry> 889 </row> 890 </tbody> 891 </entrytbl> 892 </row> 893 <row><entry></entry></row> 894 <row id="v4l2-mpeg-audio-encoding"> 895 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_ENCODING</constant> </entry> 896 <entry>enum v4l2_mpeg_audio_encoding</entry> 897 </row><row><entry spanname="descr">MPEG Audio encoding. 898 This control is specific to multiplexed MPEG streams. 899 Possible values are:</entry> 900 </row> 901 <row> 902 <entrytbl spanname="descr" cols="2"> 903 <tbody valign="top"> 904 <row> 905 <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_1</constant> </entry> 906 <entry>MPEG-1/2 Layer I encoding</entry> 907 </row> 908 <row> 909 <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_2</constant> </entry> 910 <entry>MPEG-1/2 Layer II encoding</entry> 911 </row> 912 <row> 913 <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_3</constant> </entry> 914 <entry>MPEG-1/2 Layer III encoding</entry> 915 </row> 916 <row> 917 <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant> </entry> 918 <entry>MPEG-2/4 AAC (Advanced Audio Coding)</entry> 919 </row> 920 <row> 921 <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant> </entry> 922 <entry>AC-3 aka ATSC A/52 encoding</entry> 923 </row> 924 </tbody> 925 </entrytbl> 926 </row> 927 <row><entry></entry></row> 928 <row id="v4l2-mpeg-audio-l1-bitrate"> 929 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L1_BITRATE</constant> </entry> 930 <entry>enum v4l2_mpeg_audio_l1_bitrate</entry> 931 </row><row><entry spanname="descr">MPEG-1/2 Layer I bitrate. 932 Possible values are:</entry> 933 </row> 934 <row> 935 <entrytbl spanname="descr" cols="2"> 936 <tbody valign="top"> 937 <row> 938 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_32K</constant> </entry> 939 <entry>32 kbit/s</entry></row> 940 <row> 941 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_64K</constant> </entry> 942 <entry>64 kbit/s</entry> 943 </row> 944 <row> 945 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_96K</constant> </entry> 946 <entry>96 kbit/s</entry> 947 </row> 948 <row> 949 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_128K</constant> </entry> 950 <entry>128 kbit/s</entry> 951 </row> 952 <row> 953 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_160K</constant> </entry> 954 <entry>160 kbit/s</entry> 955 </row> 956 <row> 957 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_192K</constant> </entry> 958 <entry>192 kbit/s</entry> 959 </row> 960 <row> 961 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_224K</constant> </entry> 962 <entry>224 kbit/s</entry> 963 </row> 964 <row> 965 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_256K</constant> </entry> 966 <entry>256 kbit/s</entry> 967 </row> 968 <row> 969 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_288K</constant> </entry> 970 <entry>288 kbit/s</entry> 971 </row> 972 <row> 973 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_320K</constant> </entry> 974 <entry>320 kbit/s</entry> 975 </row> 976 <row> 977 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_352K</constant> </entry> 978 <entry>352 kbit/s</entry> 979 </row> 980 <row> 981 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_384K</constant> </entry> 982 <entry>384 kbit/s</entry> 983 </row> 984 <row> 985 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_416K</constant> </entry> 986 <entry>416 kbit/s</entry> 987 </row> 988 <row> 989 <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_448K</constant> </entry> 990 <entry>448 kbit/s</entry> 991 </row> 992 </tbody> 993 </entrytbl> 994 </row> 995 <row><entry></entry></row> 996 <row id="v4l2-mpeg-audio-l2-bitrate"> 997 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L2_BITRATE</constant> </entry> 998 <entry>enum v4l2_mpeg_audio_l2_bitrate</entry> 999 </row><row><entry spanname="descr">MPEG-1/2 Layer II bitrate. 1000 Possible values are:</entry> 1001 </row> 1002 <row> 1003 <entrytbl spanname="descr" cols="2"> 1004 <tbody valign="top"> 1005 <row> 1006 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_32K</constant> </entry> 1007 <entry>32 kbit/s</entry> 1008 </row> 1009 <row> 1010 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_48K</constant> </entry> 1011 <entry>48 kbit/s</entry> 1012 </row> 1013 <row> 1014 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_56K</constant> </entry> 1015 <entry>56 kbit/s</entry> 1016 </row> 1017 <row> 1018 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_64K</constant> </entry> 1019 <entry>64 kbit/s</entry> 1020 </row> 1021 <row> 1022 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_80K</constant> </entry> 1023 <entry>80 kbit/s</entry> 1024 </row> 1025 <row> 1026 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_96K</constant> </entry> 1027 <entry>96 kbit/s</entry> 1028 </row> 1029 <row> 1030 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_112K</constant> </entry> 1031 <entry>112 kbit/s</entry> 1032 </row> 1033 <row> 1034 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_128K</constant> </entry> 1035 <entry>128 kbit/s</entry> 1036 </row> 1037 <row> 1038 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_160K</constant> </entry> 1039 <entry>160 kbit/s</entry> 1040 </row> 1041 <row> 1042 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_192K</constant> </entry> 1043 <entry>192 kbit/s</entry> 1044 </row> 1045 <row> 1046 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_224K</constant> </entry> 1047 <entry>224 kbit/s</entry> 1048 </row> 1049 <row> 1050 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_256K</constant> </entry> 1051 <entry>256 kbit/s</entry> 1052 </row> 1053 <row> 1054 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_320K</constant> </entry> 1055 <entry>320 kbit/s</entry> 1056 </row> 1057 <row> 1058 <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_384K</constant> </entry> 1059 <entry>384 kbit/s</entry> 1060 </row> 1061 </tbody> 1062 </entrytbl> 1063 </row> 1064 <row><entry></entry></row> 1065 <row id="v4l2-mpeg-audio-l3-bitrate"> 1066 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L3_BITRATE</constant> </entry> 1067 <entry>enum v4l2_mpeg_audio_l3_bitrate</entry> 1068 </row><row><entry spanname="descr">MPEG-1/2 Layer III bitrate. 1069 Possible values are:</entry> 1070 </row> 1071 <row> 1072 <entrytbl spanname="descr" cols="2"> 1073 <tbody valign="top"> 1074 <row> 1075 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_32K</constant> </entry> 1076 <entry>32 kbit/s</entry> 1077 </row> 1078 <row> 1079 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_40K</constant> </entry> 1080 <entry>40 kbit/s</entry> 1081 </row> 1082 <row> 1083 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_48K</constant> </entry> 1084 <entry>48 kbit/s</entry> 1085 </row> 1086 <row> 1087 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_56K</constant> </entry> 1088 <entry>56 kbit/s</entry> 1089 </row> 1090 <row> 1091 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_64K</constant> </entry> 1092 <entry>64 kbit/s</entry> 1093 </row> 1094 <row> 1095 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_80K</constant> </entry> 1096 <entry>80 kbit/s</entry> 1097 </row> 1098 <row> 1099 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_96K</constant> </entry> 1100 <entry>96 kbit/s</entry> 1101 </row> 1102 <row> 1103 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_112K</constant> </entry> 1104 <entry>112 kbit/s</entry> 1105 </row> 1106 <row> 1107 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_128K</constant> </entry> 1108 <entry>128 kbit/s</entry> 1109 </row> 1110 <row> 1111 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_160K</constant> </entry> 1112 <entry>160 kbit/s</entry> 1113 </row> 1114 <row> 1115 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_192K</constant> </entry> 1116 <entry>192 kbit/s</entry> 1117 </row> 1118 <row> 1119 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_224K</constant> </entry> 1120 <entry>224 kbit/s</entry> 1121 </row> 1122 <row> 1123 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_256K</constant> </entry> 1124 <entry>256 kbit/s</entry> 1125 </row> 1126 <row> 1127 <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_320K</constant> </entry> 1128 <entry>320 kbit/s</entry> 1129 </row> 1130 </tbody> 1131 </entrytbl> 1132 </row> 1133 <row><entry></entry></row> 1134 <row> 1135 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AAC_BITRATE</constant> </entry> 1136 <entry>integer</entry> 1137 </row><row><entry spanname="descr">AAC bitrate in bits per second.</entry> 1138 </row> 1139 <row><entry></entry></row> 1140 <row id="v4l2-mpeg-audio-ac3-bitrate"> 1141 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AC3_BITRATE</constant> </entry> 1142 <entry>enum v4l2_mpeg_audio_ac3_bitrate</entry> 1143 </row><row><entry spanname="descr">AC-3 bitrate. 1144 Possible values are:</entry> 1145 </row> 1146 <row> 1147 <entrytbl spanname="descr" cols="2"> 1148 <tbody valign="top"> 1149 <row> 1150 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_32K</constant> </entry> 1151 <entry>32 kbit/s</entry> 1152 </row> 1153 <row> 1154 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_40K</constant> </entry> 1155 <entry>40 kbit/s</entry> 1156 </row> 1157 <row> 1158 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_48K</constant> </entry> 1159 <entry>48 kbit/s</entry> 1160 </row> 1161 <row> 1162 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_56K</constant> </entry> 1163 <entry>56 kbit/s</entry> 1164 </row> 1165 <row> 1166 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_64K</constant> </entry> 1167 <entry>64 kbit/s</entry> 1168 </row> 1169 <row> 1170 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_80K</constant> </entry> 1171 <entry>80 kbit/s</entry> 1172 </row> 1173 <row> 1174 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_96K</constant> </entry> 1175 <entry>96 kbit/s</entry> 1176 </row> 1177 <row> 1178 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_112K</constant> </entry> 1179 <entry>112 kbit/s</entry> 1180 </row> 1181 <row> 1182 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_128K</constant> </entry> 1183 <entry>128 kbit/s</entry> 1184 </row> 1185 <row> 1186 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_160K</constant> </entry> 1187 <entry>160 kbit/s</entry> 1188 </row> 1189 <row> 1190 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_192K</constant> </entry> 1191 <entry>192 kbit/s</entry> 1192 </row> 1193 <row> 1194 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_224K</constant> </entry> 1195 <entry>224 kbit/s</entry> 1196 </row> 1197 <row> 1198 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_256K</constant> </entry> 1199 <entry>256 kbit/s</entry> 1200 </row> 1201 <row> 1202 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_320K</constant> </entry> 1203 <entry>320 kbit/s</entry> 1204 </row> 1205 <row> 1206 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_384K</constant> </entry> 1207 <entry>384 kbit/s</entry> 1208 </row> 1209 <row> 1210 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_448K</constant> </entry> 1211 <entry>448 kbit/s</entry> 1212 </row> 1213 <row> 1214 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_512K</constant> </entry> 1215 <entry>512 kbit/s</entry> 1216 </row> 1217 <row> 1218 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_576K</constant> </entry> 1219 <entry>576 kbit/s</entry> 1220 </row> 1221 <row> 1222 <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_640K</constant> </entry> 1223 <entry>640 kbit/s</entry> 1224 </row> 1225 </tbody> 1226 </entrytbl> 1227 </row> 1228 <row><entry></entry></row> 1229 <row id="v4l2-mpeg-audio-mode"> 1230 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE</constant> </entry> 1231 <entry>enum v4l2_mpeg_audio_mode</entry> 1232 </row><row><entry spanname="descr">MPEG Audio mode. 1233 Possible values are:</entry> 1234 </row> 1235 <row> 1236 <entrytbl spanname="descr" cols="2"> 1237 <tbody valign="top"> 1238 <row> 1239 <entry><constant>V4L2_MPEG_AUDIO_MODE_STEREO</constant> </entry> 1240 <entry>Stereo</entry> 1241 </row> 1242 <row> 1243 <entry><constant>V4L2_MPEG_AUDIO_MODE_JOINT_STEREO</constant> </entry> 1244 <entry>Joint Stereo</entry> 1245 </row> 1246 <row> 1247 <entry><constant>V4L2_MPEG_AUDIO_MODE_DUAL</constant> </entry> 1248 <entry>Bilingual</entry> 1249 </row> 1250 <row> 1251 <entry><constant>V4L2_MPEG_AUDIO_MODE_MONO</constant> </entry> 1252 <entry>Mono</entry> 1253 </row> 1254 </tbody> 1255 </entrytbl> 1256 </row> 1257 <row><entry></entry></row> 1258 <row id="v4l2-mpeg-audio-mode-extension"> 1259 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE_EXTENSION</constant> </entry> 1260 <entry>enum v4l2_mpeg_audio_mode_extension</entry> 1261 </row><row><entry spanname="descr">Joint Stereo 1262 audio mode extension. In Layer I and II they indicate which subbands 1263 are in intensity stereo. All other subbands are coded in stereo. Layer 1264 III is not (yet) supported. Possible values 1265 are:</entry> 1266 </row> 1267 <row> 1268 <entrytbl spanname="descr" cols="2"> 1269 <tbody valign="top"> 1270 <row> 1271 <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4</constant> </entry> 1272 <entry>Subbands 4-31 in intensity stereo</entry> 1273 </row> 1274 <row> 1275 <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8</constant> </entry> 1276 <entry>Subbands 8-31 in intensity stereo</entry> 1277 </row> 1278 <row> 1279 <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12</constant> </entry> 1280 <entry>Subbands 12-31 in intensity stereo</entry> 1281 </row> 1282 <row> 1283 <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16</constant> </entry> 1284 <entry>Subbands 16-31 in intensity stereo</entry> 1285 </row> 1286 </tbody> 1287 </entrytbl> 1288 </row> 1289 <row><entry></entry></row> 1290 <row id="v4l2-mpeg-audio-emphasis"> 1291 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_EMPHASIS</constant> </entry> 1292 <entry>enum v4l2_mpeg_audio_emphasis</entry> 1293 </row><row><entry spanname="descr">Audio Emphasis. 1294 Possible values are:</entry> 1295 </row> 1296 <row> 1297 <entrytbl spanname="descr" cols="2"> 1298 <tbody valign="top"> 1299 <row> 1300 <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_NONE</constant> </entry> 1301 <entry>None</entry> 1302 </row> 1303 <row> 1304 <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS</constant> </entry> 1305 <entry>50/15 microsecond emphasis</entry> 1306 </row> 1307 <row> 1308 <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17</constant> </entry> 1309 <entry>CCITT J.17</entry> 1310 </row> 1311 </tbody> 1312 </entrytbl> 1313 </row> 1314 <row><entry></entry></row> 1315 <row id="v4l2-mpeg-audio-crc"> 1316 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_CRC</constant> </entry> 1317 <entry>enum v4l2_mpeg_audio_crc</entry> 1318 </row><row><entry spanname="descr">CRC method. Possible 1319 values are:</entry> 1320 </row> 1321 <row> 1322 <entrytbl spanname="descr" cols="2"> 1323 <tbody valign="top"> 1324 <row> 1325 <entry><constant>V4L2_MPEG_AUDIO_CRC_NONE</constant> </entry> 1326 <entry>None</entry> 1327 </row> 1328 <row> 1329 <entry><constant>V4L2_MPEG_AUDIO_CRC_CRC16</constant> </entry> 1330 <entry>16 bit parity check</entry> 1331 </row> 1332 </tbody> 1333 </entrytbl> 1334 </row> 1335 <row><entry></entry></row> 1336 <row> 1337 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MUTE</constant> </entry> 1338 <entry>boolean</entry> 1339 </row><row><entry spanname="descr">Mutes the audio when 1340 capturing. This is not done by muting audio hardware, which can still 1341 produce a slight hiss, but in the encoder itself, guaranteeing a fixed 1342 and reproducible audio bitstream. 0 = unmuted, 1 = muted.</entry> 1343 </row> 1344 <row><entry></entry></row> 1345 <row id="v4l2-mpeg-audio-dec-playback"> 1346 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant> </entry> 1347 <entry>enum v4l2_mpeg_audio_dec_playback</entry> 1348 </row><row><entry spanname="descr">Determines how monolingual audio should be played back. 1349 Possible values are:</entry> 1350 </row> 1351 <row> 1352 <entrytbl spanname="descr" cols="2"> 1353 <tbody valign="top"> 1354 <row> 1355 <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO</constant> </entry> 1356 <entry>Automatically determines the best playback mode.</entry> 1357 </row> 1358 <row> 1359 <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant> </entry> 1360 <entry>Stereo playback.</entry> 1361 </row> 1362 <row> 1363 <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant> </entry> 1364 <entry>Left channel playback.</entry> 1365 </row> 1366 <row> 1367 <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant> </entry> 1368 <entry>Right channel playback.</entry> 1369 </row> 1370 <row> 1371 <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant> </entry> 1372 <entry>Mono playback.</entry> 1373 </row> 1374 <row> 1375 <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant> </entry> 1376 <entry>Stereo playback with swapped left and right channels.</entry> 1377 </row> 1378 </tbody> 1379 </entrytbl> 1380 </row> 1381 <row><entry></entry></row> 1382 <row id="v4l2-mpeg-audio-dec-multilingual-playback"> 1383 <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant> </entry> 1384 <entry>enum v4l2_mpeg_audio_dec_playback</entry> 1385 </row><row><entry spanname="descr">Determines how multilingual audio should be played back.</entry> 1386 </row> 1387 <row><entry></entry></row> 1388 <row id="v4l2-mpeg-video-encoding"> 1389 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ENCODING</constant> </entry> 1390 <entry>enum v4l2_mpeg_video_encoding</entry> 1391 </row><row><entry spanname="descr">MPEG Video encoding 1392 method. This control is specific to multiplexed MPEG streams. 1393 Possible values are:</entry> 1394 </row> 1395 <row> 1396 <entrytbl spanname="descr" cols="2"> 1397 <tbody valign="top"> 1398 <row> 1399 <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_1</constant> </entry> 1400 <entry>MPEG-1 Video encoding</entry> 1401 </row> 1402 <row> 1403 <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_2</constant> </entry> 1404 <entry>MPEG-2 Video encoding</entry> 1405 </row> 1406 <row> 1407 <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant> </entry> 1408 <entry>MPEG-4 AVC (H.264) Video encoding</entry> 1409 </row> 1410 </tbody> 1411 </entrytbl> 1412 </row> 1413 <row><entry></entry></row> 1414 <row id="v4l2-mpeg-video-aspect"> 1415 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ASPECT</constant> </entry> 1416 <entry>enum v4l2_mpeg_video_aspect</entry> 1417 </row><row><entry spanname="descr">Video aspect. 1418 Possible values are:</entry> 1419 </row> 1420 <row> 1421 <entrytbl spanname="descr" cols="2"> 1422 <tbody valign="top"> 1423 <row> 1424 <entry><constant>V4L2_MPEG_VIDEO_ASPECT_1x1</constant> </entry> 1425 </row> 1426 <row> 1427 <entry><constant>V4L2_MPEG_VIDEO_ASPECT_4x3</constant> </entry> 1428 </row> 1429 <row> 1430 <entry><constant>V4L2_MPEG_VIDEO_ASPECT_16x9</constant> </entry> 1431 </row> 1432 <row> 1433 <entry><constant>V4L2_MPEG_VIDEO_ASPECT_221x100</constant> </entry> 1434 </row> 1435 </tbody> 1436 </entrytbl> 1437 </row> 1438 <row><entry></entry></row> 1439 <row> 1440 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_B_FRAMES</constant> </entry> 1441 <entry>integer</entry> 1442 </row><row><entry spanname="descr">Number of B-Frames 1443 (default 2)</entry> 1444 </row> 1445 <row><entry></entry></row> 1446 <row> 1447 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_SIZE</constant> </entry> 1448 <entry>integer</entry> 1449 </row><row><entry spanname="descr">GOP size (default 1450 12)</entry> 1451 </row> 1452 <row><entry></entry></row> 1453 <row> 1454 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_CLOSURE</constant> </entry> 1455 <entry>boolean</entry> 1456 </row><row><entry spanname="descr">GOP closure (default 1457 1)</entry> 1458 </row> 1459 <row><entry></entry></row> 1460 <row> 1461 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_PULLDOWN</constant> </entry> 1462 <entry>boolean</entry> 1463 </row><row><entry spanname="descr">Enable 3:2 pulldown 1464 (default 0)</entry> 1465 </row> 1466 <row><entry></entry></row> 1467 <row id="v4l2-mpeg-video-bitrate-mode"> 1468 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_MODE</constant> </entry> 1469 <entry>enum v4l2_mpeg_video_bitrate_mode</entry> 1470 </row><row><entry spanname="descr">Video bitrate mode. 1471 Possible values are:</entry> 1472 </row> 1473 <row> 1474 <entrytbl spanname="descr" cols="2"> 1475 <tbody valign="top"> 1476 <row> 1477 <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_VBR</constant> </entry> 1478 <entry>Variable bitrate</entry> 1479 </row> 1480 <row> 1481 <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_CBR</constant> </entry> 1482 <entry>Constant bitrate</entry> 1483 </row> 1484 </tbody> 1485 </entrytbl> 1486 </row> 1487 <row><entry></entry></row> 1488 <row> 1489 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE</constant> </entry> 1490 <entry>integer</entry> 1491 </row><row><entry spanname="descr">Video bitrate in bits 1492 per second.</entry> 1493 </row> 1494 <row><entry></entry></row> 1495 <row> 1496 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_PEAK</constant> </entry> 1497 <entry>integer</entry> 1498 </row><row><entry spanname="descr">Peak video bitrate in 1499 bits per second. Must be larger or equal to the average video bitrate. 1500 It is ignored if the video bitrate mode is set to constant 1501 bitrate.</entry> 1502 </row> 1503 <row><entry></entry></row> 1504 <row> 1505 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION</constant> </entry> 1506 <entry>integer</entry> 1507 </row><row><entry spanname="descr">For every captured 1508 frame, skip this many subsequent frames (default 0).</entry> 1509 </row> 1510 <row><entry></entry></row> 1511 <row> 1512 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE</constant> </entry> 1513 <entry>boolean</entry> 1514 </row> 1515 <row><entry spanname="descr">"Mutes" the video to a 1516 fixed color when capturing. This is useful for testing, to produce a 1517 fixed video bitstream. 0 = unmuted, 1 = muted.</entry> 1518 </row> 1519 <row><entry></entry></row> 1520 <row> 1521 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE_YUV</constant> </entry> 1522 <entry>integer</entry> 1523 </row><row><entry spanname="descr">Sets the "mute" color 1524 of the video. The supplied 32-bit integer is interpreted as follows (bit 1525 0 = least significant bit):</entry> 1526 </row> 1527 <row> 1528 <entrytbl spanname="descr" cols="2"> 1529 <tbody valign="top"> 1530 <row> 1531 <entry>Bit 0:7</entry> 1532 <entry>V chrominance information</entry> 1533 </row> 1534 <row> 1535 <entry>Bit 8:15</entry> 1536 <entry>U chrominance information</entry> 1537 </row> 1538 <row> 1539 <entry>Bit 16:23</entry> 1540 <entry>Y luminance information</entry> 1541 </row> 1542 <row> 1543 <entry>Bit 24:31</entry> 1544 <entry>Must be zero.</entry> 1545 </row> 1546 </tbody> 1547 </entrytbl> 1548 </row> 1549 <row><entry></entry></row> 1550 <row id="v4l2-mpeg-video-dec-pts"> 1551 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant> </entry> 1552 <entry>integer64</entry> 1553 </row><row><entry spanname="descr">This read-only control returns the 1554 33-bit video Presentation Time Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of 1555 the currently displayed frame. This is the same PTS as is used in &VIDIOC-DECODER-CMD;.</entry> 1556 </row> 1557 <row><entry></entry></row> 1558 <row id="v4l2-mpeg-video-dec-frame"> 1559 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant> </entry> 1560 <entry>integer64</entry> 1561 </row><row><entry spanname="descr">This read-only control returns the 1562 frame counter of the frame that is currently displayed (decoded). This value is reset to 0 whenever 1563 the decoder is started.</entry> 1564 </row> 1565 1566 <row><entry></entry></row> 1567 <row> 1568 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE</constant> </entry> 1569 <entry>boolean</entry> 1570 </row> 1571 <row><entry spanname="descr">If enabled the decoder expects to receive a single slice per buffer, otherwise 1572 the decoder expects a single frame in per buffer. Applicable to the decoder, all codecs. 1573 </entry> 1574 </row> 1575 1576 <row><entry></entry></row> 1577 <row> 1578 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE</constant> </entry> 1579 <entry>boolean</entry> 1580 </row> 1581 <row><entry spanname="descr">Enable writing sample aspect ratio in the Video Usability Information. 1582 Applicable to the H264 encoder.</entry> 1583 </row> 1584 1585 <row><entry></entry></row> 1586 <row id="v4l2-mpeg-video-h264-vui-sar-idc"> 1587 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC</constant> </entry> 1588 <entry>enum v4l2_mpeg_video_h264_vui_sar_idc</entry> 1589 </row> 1590 <row><entry spanname="descr">VUI sample aspect ratio indicator for H.264 encoding. The value 1591 is defined in the table E-1 in the standard. Applicable to the H264 encoder.</entry> 1592 </row> 1593 <row> 1594 <entrytbl spanname="descr" cols="2"> 1595 <tbody valign="top"> 1596 1597 <row> 1598 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_UNSPECIFIED</constant> </entry> 1599 <entry>Unspecified</entry> 1600 </row> 1601 <row> 1602 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1</constant> </entry> 1603 <entry>1x1</entry> 1604 </row> 1605 <row> 1606 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11</constant> </entry> 1607 <entry>12x11</entry> 1608 </row> 1609 <row> 1610 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11</constant> </entry> 1611 <entry>10x11</entry> 1612 </row> 1613 <row> 1614 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11</constant> </entry> 1615 <entry>16x11</entry> 1616 </row> 1617 <row> 1618 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33</constant> </entry> 1619 <entry>40x33</entry> 1620 </row> 1621 <row> 1622 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11</constant> </entry> 1623 <entry>24x11</entry> 1624 </row> 1625 <row> 1626 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11</constant> </entry> 1627 <entry>20x11</entry> 1628 </row> 1629 <row> 1630 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11</constant> </entry> 1631 <entry>32x11</entry> 1632 </row> 1633 <row> 1634 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33</constant> </entry> 1635 <entry>80x33</entry> 1636 </row> 1637 <row> 1638 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11</constant> </entry> 1639 <entry>18x11</entry> 1640 </row> 1641 <row> 1642 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11</constant> </entry> 1643 <entry>15x11</entry> 1644 </row> 1645 <row> 1646 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33</constant> </entry> 1647 <entry>64x33</entry> 1648 </row> 1649 <row> 1650 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99</constant> </entry> 1651 <entry>160x99</entry> 1652 </row> 1653 <row> 1654 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3</constant> </entry> 1655 <entry>4x3</entry> 1656 </row> 1657 <row> 1658 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2</constant> </entry> 1659 <entry>3x2</entry> 1660 </row> 1661 <row> 1662 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1</constant> </entry> 1663 <entry>2x1</entry> 1664 </row> 1665 <row> 1666 <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED</constant> </entry> 1667 <entry>Extended SAR</entry> 1668 </row> 1669 </tbody> 1670 </entrytbl> 1671 </row> 1672 1673 <row><entry></entry></row> 1674 <row> 1675 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH</constant> </entry> 1676 <entry>integer</entry> 1677 </row> 1678 <row><entry spanname="descr">Extended sample aspect ratio width for H.264 VUI encoding. 1679 Applicable to the H264 encoder.</entry> 1680 </row> 1681 1682 <row><entry></entry></row> 1683 <row> 1684 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT</constant> </entry> 1685 <entry>integer</entry> 1686 </row> 1687 <row><entry spanname="descr">Extended sample aspect ratio height for H.264 VUI encoding. 1688 Applicable to the H264 encoder.</entry> 1689 </row> 1690 1691 <row><entry></entry></row> 1692 <row id="v4l2-mpeg-video-h264-level"> 1693 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LEVEL</constant> </entry> 1694 <entry>enum v4l2_mpeg_video_h264_level</entry> 1695 </row> 1696 <row><entry spanname="descr">The level information for the H264 video elementary stream. 1697 Applicable to the H264 encoder. 1698 Possible values are:</entry> 1699 </row> 1700 <row> 1701 <entrytbl spanname="descr" cols="2"> 1702 <tbody valign="top"> 1703 <row> 1704 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_0</constant> </entry> 1705 <entry>Level 1.0</entry> 1706 </row> 1707 <row> 1708 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1B</constant> </entry> 1709 <entry>Level 1B</entry> 1710 </row> 1711 <row> 1712 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_1</constant> </entry> 1713 <entry>Level 1.1</entry> 1714 </row> 1715 <row> 1716 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_2</constant> </entry> 1717 <entry>Level 1.2</entry> 1718 </row> 1719 <row> 1720 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_3</constant> </entry> 1721 <entry>Level 1.3</entry> 1722 </row> 1723 <row> 1724 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_0</constant> </entry> 1725 <entry>Level 2.0</entry> 1726 </row> 1727 <row> 1728 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_1</constant> </entry> 1729 <entry>Level 2.1</entry> 1730 </row> 1731 <row> 1732 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_2</constant> </entry> 1733 <entry>Level 2.2</entry> 1734 </row> 1735 <row> 1736 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_0</constant> </entry> 1737 <entry>Level 3.0</entry> 1738 </row> 1739 <row> 1740 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_1</constant> </entry> 1741 <entry>Level 3.1</entry> 1742 </row> 1743 <row> 1744 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_2</constant> </entry> 1745 <entry>Level 3.2</entry> 1746 </row> 1747 <row> 1748 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_0</constant> </entry> 1749 <entry>Level 4.0</entry> 1750 </row> 1751 <row> 1752 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_1</constant> </entry> 1753 <entry>Level 4.1</entry> 1754 </row> 1755 <row> 1756 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_2</constant> </entry> 1757 <entry>Level 4.2</entry> 1758 </row> 1759 <row> 1760 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_0</constant> </entry> 1761 <entry>Level 5.0</entry> 1762 </row> 1763 <row> 1764 <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_1</constant> </entry> 1765 <entry>Level 5.1</entry> 1766 </row> 1767 </tbody> 1768 </entrytbl> 1769 </row> 1770 1771 <row><entry></entry></row> 1772 <row id="v4l2-mpeg-video-mpeg4-level"> 1773 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL</constant> </entry> 1774 <entry>enum v4l2_mpeg_video_mpeg4_level</entry> 1775 </row> 1776 <row><entry spanname="descr">The level information for the MPEG4 elementary stream. 1777 Applicable to the MPEG4 encoder. 1778 Possible values are:</entry> 1779 </row> 1780 <row> 1781 <entrytbl spanname="descr" cols="2"> 1782 <tbody valign="top"> 1783 <row> 1784 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0</constant> </entry> 1785 <entry>Level 0</entry> 1786 </row> 1787 <row> 1788 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0B</constant> </entry> 1789 <entry>Level 0b</entry> 1790 </row> 1791 <row> 1792 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_1</constant> </entry> 1793 <entry>Level 1</entry> 1794 </row> 1795 <row> 1796 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_2</constant> </entry> 1797 <entry>Level 2</entry> 1798 </row> 1799 <row> 1800 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3</constant> </entry> 1801 <entry>Level 3</entry> 1802 </row> 1803 <row> 1804 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3B</constant> </entry> 1805 <entry>Level 3b</entry> 1806 </row> 1807 <row> 1808 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_4</constant> </entry> 1809 <entry>Level 4</entry> 1810 </row> 1811 <row> 1812 <entry><constant>V4L2_MPEG_VIDEO_LEVEL_5</constant> </entry> 1813 <entry>Level 5</entry> 1814 </row> 1815 </tbody> 1816 </entrytbl> 1817 </row> 1818 1819 <row><entry></entry></row> 1820 <row id="v4l2-mpeg-video-h264-profile"> 1821 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_PROFILE</constant> </entry> 1822 <entry>enum v4l2_mpeg_video_h264_profile</entry> 1823 </row> 1824 <row><entry spanname="descr">The profile information for H264. 1825 Applicable to the H264 encoder. 1826 Possible values are:</entry> 1827 </row> 1828 <row> 1829 <entrytbl spanname="descr" cols="2"> 1830 <tbody valign="top"> 1831 <row> 1832 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE</constant> </entry> 1833 <entry>Baseline profile</entry> 1834 </row> 1835 <row> 1836 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE</constant> </entry> 1837 <entry>Constrained Baseline profile</entry> 1838 </row> 1839 <row> 1840 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MAIN</constant> </entry> 1841 <entry>Main profile</entry> 1842 </row> 1843 <row> 1844 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED</constant> </entry> 1845 <entry>Extended profile</entry> 1846 </row> 1847 <row> 1848 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH</constant> </entry> 1849 <entry>High profile</entry> 1850 </row> 1851 <row> 1852 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10</constant> </entry> 1853 <entry>High 10 profile</entry> 1854 </row> 1855 <row> 1856 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422</constant> </entry> 1857 <entry>High 422 profile</entry> 1858 </row> 1859 <row> 1860 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE</constant> </entry> 1861 <entry>High 444 Predictive profile</entry> 1862 </row> 1863 <row> 1864 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA</constant> </entry> 1865 <entry>High 10 Intra profile</entry> 1866 </row> 1867 <row> 1868 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA</constant> </entry> 1869 <entry>High 422 Intra profile</entry> 1870 </row> 1871 <row> 1872 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA</constant> </entry> 1873 <entry>High 444 Intra profile</entry> 1874 </row> 1875 <row> 1876 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA</constant> </entry> 1877 <entry>CAVLC 444 Intra profile</entry> 1878 </row> 1879 <row> 1880 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE</constant> </entry> 1881 <entry>Scalable Baseline profile</entry> 1882 </row> 1883 <row> 1884 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH</constant> </entry> 1885 <entry>Scalable High profile</entry> 1886 </row> 1887 <row> 1888 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA</constant> </entry> 1889 <entry>Scalable High Intra profile</entry> 1890 </row> 1891 <row> 1892 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH</constant> </entry> 1893 <entry>Stereo High profile</entry> 1894 </row> 1895 <row> 1896 <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH</constant> </entry> 1897 <entry>Multiview High profile</entry> 1898 </row> 1899 1900 </tbody> 1901 </entrytbl> 1902 </row> 1903 1904 <row><entry></entry></row> 1905 <row id="v4l2-mpeg-video-mpeg4-profile"> 1906 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE</constant> </entry> 1907 <entry>enum v4l2_mpeg_video_mpeg4_profile</entry> 1908 </row> 1909 <row><entry spanname="descr">The profile information for MPEG4. 1910 Applicable to the MPEG4 encoder. 1911 Possible values are:</entry> 1912 </row> 1913 <row> 1914 <entrytbl spanname="descr" cols="2"> 1915 <tbody valign="top"> 1916 <row> 1917 <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE</constant> </entry> 1918 <entry>Simple profile</entry> 1919 </row> 1920 <row> 1921 <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_SIMPLE</constant> </entry> 1922 <entry>Advanced Simple profile</entry> 1923 </row> 1924 <row> 1925 <entry><constant>V4L2_MPEG_VIDEO_PROFILE_CORE</constant> </entry> 1926 <entry>Core profile</entry> 1927 </row> 1928 <row> 1929 <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE_SCALABLE</constant> </entry> 1930 <entry>Simple Scalable profile</entry> 1931 </row> 1932 <row> 1933 <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY</constant> </entry> 1934 <entry></entry> 1935 </row> 1936 </tbody> 1937 </entrytbl> 1938 </row> 1939 1940 <row><entry></entry></row> 1941 <row> 1942 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MAX_REF_PIC</constant> </entry> 1943 <entry>integer</entry> 1944 </row> 1945 <row><entry spanname="descr">The maximum number of reference pictures used for encoding. 1946 Applicable to the encoder. 1947 </entry> 1948 </row> 1949 1950 <row><entry></entry></row> 1951 <row id="v4l2-mpeg-video-multi-slice-mode"> 1952 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> </entry> 1953 <entry>enum v4l2_mpeg_video_multi_slice_mode</entry> 1954 </row> 1955 <row><entry spanname="descr">Determines how the encoder should handle division of frame into slices. 1956 Applicable to the encoder. 1957 Possible values are:</entry> 1958 </row> 1959 <row> 1960 <entrytbl spanname="descr" cols="2"> 1961 <tbody valign="top"> 1962 <row> 1963 <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE</constant> </entry> 1964 <entry>Single slice per frame.</entry> 1965 </row> 1966 <row> 1967 <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant> </entry> 1968 <entry>Multiple slices with set maximum number of macroblocks per slice.</entry> 1969 </row> 1970 <row> 1971 <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant> </entry> 1972 <entry>Multiple slice with set maximum size in bytes per slice.</entry> 1973 </row> 1974 </tbody> 1975 </entrytbl> 1976 </row> 1977 1978 <row><entry></entry></row> 1979 <row> 1980 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB</constant> </entry> 1981 <entry>integer</entry> 1982 </row> 1983 <row><entry spanname="descr">The maximum number of macroblocks in a slice. Used when 1984 <constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>. 1985 Applicable to the encoder.</entry> 1986 </row> 1987 1988 <row><entry></entry></row> 1989 <row> 1990 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES</constant> </entry> 1991 <entry>integer</entry> 1992 </row> 1993 <row><entry spanname="descr">The maximum size of a slice in bytes. Used when 1994 <constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>. 1995 Applicable to the encoder.</entry> 1996 </row> 1997 1998 <row><entry></entry></row> 1999 <row id="v4l2-mpeg-video-h264-loop-filter-mode"> 2000 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE</constant> </entry> 2001 <entry>enum v4l2_mpeg_video_h264_loop_filter_mode</entry> 2002 </row> 2003 <row><entry spanname="descr">Loop filter mode for H264 encoder. 2004 Possible values are:</entry> 2005 </row> 2006 <row> 2007 <entrytbl spanname="descr" cols="2"> 2008 <tbody valign="top"> 2009 <row> 2010 <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED</constant> </entry> 2011 <entry>Loop filter is enabled.</entry> 2012 </row> 2013 <row> 2014 <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED</constant> </entry> 2015 <entry>Loop filter is disabled.</entry> 2016 </row> 2017 <row> 2018 <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY</constant> </entry> 2019 <entry>Loop filter is disabled at the slice boundary.</entry> 2020 </row> 2021 </tbody> 2022 </entrytbl> 2023 </row> 2024 2025 <row><entry></entry></row> 2026 <row> 2027 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA</constant> </entry> 2028 <entry>integer</entry> 2029 </row> 2030 <row><entry spanname="descr">Loop filter alpha coefficient, defined in the H264 standard. 2031 Applicable to the H264 encoder.</entry> 2032 </row> 2033 2034 <row><entry></entry></row> 2035 <row> 2036 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA</constant> </entry> 2037 <entry>integer</entry> 2038 </row> 2039 <row><entry spanname="descr">Loop filter beta coefficient, defined in the H264 standard. 2040 Applicable to the H264 encoder.</entry> 2041 </row> 2042 2043 <row><entry></entry></row> 2044 <row id="v4l2-mpeg-video-h264-entropy-mode"> 2045 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE</constant> </entry> 2046 <entry>enum v4l2_mpeg_video_h264_entropy_mode</entry> 2047 </row> 2048 <row><entry spanname="descr">Entropy coding mode for H264 - CABAC/CAVALC. 2049 Applicable to the H264 encoder. 2050 Possible values are:</entry> 2051 </row> 2052 <row> 2053 <entrytbl spanname="descr" cols="2"> 2054 <tbody valign="top"> 2055 <row> 2056 <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC</constant> </entry> 2057 <entry>Use CAVLC entropy coding.</entry> 2058 </row> 2059 <row> 2060 <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC</constant> </entry> 2061 <entry>Use CABAC entropy coding.</entry> 2062 </row> 2063 </tbody> 2064 </entrytbl> 2065 </row> 2066 2067 <row><entry></entry></row> 2068 <row> 2069 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM</constant> </entry> 2070 <entry>boolean</entry> 2071 </row> 2072 <row><entry spanname="descr">Enable 8X8 transform for H264. Applicable to the H264 encoder.</entry> 2073 </row> 2074 2075 <row><entry></entry></row> 2076 <row> 2077 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB</constant> </entry> 2078 <entry>integer</entry> 2079 </row> 2080 <row><entry spanname="descr">Cyclic intra macroblock refresh. This is the number of continuous macroblocks 2081 refreshed every frame. Each frame a successive set of macroblocks is refreshed until the cycle completes and starts from the 2082 top of the frame. Applicable to H264, H263 and MPEG4 encoder.</entry> 2083 </row> 2084 2085 <row><entry></entry></row> 2086 <row> 2087 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE</constant> </entry> 2088 <entry>boolean</entry> 2089 </row> 2090 <row><entry spanname="descr">Frame level rate control enable. 2091 If this control is disabled then the quantization parameter for each frame type is constant and set with appropriate controls 2092 (e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>). 2093 If frame rate control is enabled then quantization parameter is adjusted to meet the chosen bitrate. Minimum and maximum value 2094 for the quantization parameter can be set with appropriate controls (e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>). 2095 Applicable to encoders.</entry> 2096 </row> 2097 2098 <row><entry></entry></row> 2099 <row> 2100 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant> </entry> 2101 <entry>boolean</entry> 2102 </row> 2103 <row><entry spanname="descr">Macroblock level rate control enable. 2104 Applicable to the MPEG4 and H264 encoders.</entry> 2105 </row> 2106 2107 <row><entry></entry></row> 2108 <row> 2109 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_QPEL</constant> </entry> 2110 <entry>boolean</entry> 2111 </row> 2112 <row><entry spanname="descr">Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4 encoder.</entry> 2113 </row> 2114 2115 <row><entry></entry></row> 2116 <row> 2117 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant> </entry> 2118 <entry>integer</entry> 2119 </row> 2120 <row><entry spanname="descr">Quantization parameter for an I frame for H263. Valid range: from 1 to 31.</entry> 2121 </row> 2122 2123 <row><entry></entry></row> 2124 <row> 2125 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant> </entry> 2126 <entry>integer</entry> 2127 </row> 2128 <row><entry spanname="descr">Minimum quantization parameter for H263. Valid range: from 1 to 31.</entry> 2129 </row> 2130 2131 <row><entry></entry></row> 2132 <row> 2133 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MAX_QP</constant> </entry> 2134 <entry>integer</entry> 2135 </row> 2136 <row><entry spanname="descr">Maximum quantization parameter for H263. Valid range: from 1 to 31.</entry> 2137 </row> 2138 2139 <row><entry></entry></row> 2140 <row> 2141 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP</constant> </entry> 2142 <entry>integer</entry> 2143 </row> 2144 <row><entry spanname="descr">Quantization parameter for an P frame for H263. Valid range: from 1 to 31.</entry> 2145 </row> 2146 2147 <row><entry></entry></row> 2148 <row> 2149 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP</constant> </entry> 2150 <entry>integer</entry> 2151 </row> 2152 <row><entry spanname="descr">Quantization parameter for an B frame for H263. Valid range: from 1 to 31.</entry> 2153 </row> 2154 2155 <row><entry></entry></row> 2156 <row> 2157 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP</constant> </entry> 2158 <entry>integer</entry> 2159 </row> 2160 <row><entry spanname="descr">Quantization parameter for an I frame for H264. Valid range: from 0 to 51.</entry> 2161 </row> 2162 2163 <row><entry></entry></row> 2164 <row> 2165 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MIN_QP</constant> </entry> 2166 <entry>integer</entry> 2167 </row> 2168 <row><entry spanname="descr">Minimum quantization parameter for H264. Valid range: from 0 to 51.</entry> 2169 </row> 2170 2171 <row><entry></entry></row> 2172 <row> 2173 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MAX_QP</constant> </entry> 2174 <entry>integer</entry> 2175 </row> 2176 <row><entry spanname="descr">Maximum quantization parameter for H264. Valid range: from 0 to 51.</entry> 2177 </row> 2178 2179 <row><entry></entry></row> 2180 <row> 2181 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP</constant> </entry> 2182 <entry>integer</entry> 2183 </row> 2184 <row><entry spanname="descr">Quantization parameter for an P frame for H264. Valid range: from 0 to 51.</entry> 2185 </row> 2186 2187 <row><entry></entry></row> 2188 <row> 2189 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP</constant> </entry> 2190 <entry>integer</entry> 2191 </row> 2192 <row><entry spanname="descr">Quantization parameter for an B frame for H264. Valid range: from 0 to 51.</entry> 2193 </row> 2194 2195 <row><entry></entry></row> 2196 <row> 2197 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP</constant> </entry> 2198 <entry>integer</entry> 2199 </row> 2200 <row><entry spanname="descr">Quantization parameter for an I frame for MPEG4. Valid range: from 1 to 31.</entry> 2201 </row> 2202 2203 <row><entry></entry></row> 2204 <row> 2205 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP</constant> </entry> 2206 <entry>integer</entry> 2207 </row> 2208 <row><entry spanname="descr">Minimum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry> 2209 </row> 2210 2211 <row><entry></entry></row> 2212 <row> 2213 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP</constant> </entry> 2214 <entry>integer</entry> 2215 </row> 2216 <row><entry spanname="descr">Maximum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry> 2217 </row> 2218 2219 <row><entry></entry></row> 2220 <row> 2221 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP</constant> </entry> 2222 <entry>integer</entry> 2223 </row> 2224 <row><entry spanname="descr">Quantization parameter for an P frame for MPEG4. Valid range: from 1 to 31.</entry> 2225 </row> 2226 2227 <row><entry></entry></row> 2228 <row> 2229 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP</constant> </entry> 2230 <entry>integer</entry> 2231 </row> 2232 <row><entry spanname="descr">Quantization parameter for an B frame for MPEG4. Valid range: from 1 to 31.</entry> 2233 </row> 2234 2235 <row><entry></entry></row> 2236 <row> 2237 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_SIZE</constant> </entry> 2238 <entry>integer</entry> 2239 </row> 2240 <row><entry spanname="descr">The Video Buffer Verifier size in kilobytes, it is used as a limitation of frame skip. 2241 The VBV is defined in the standard as a mean to verify that the produced stream will be successfully decoded. 2242 The standard describes it as "Part of a hypothetical decoder that is conceptually connected to the 2243 output of the encoder. Its purpose is to provide a constraint on the variability of the data rate that an 2244 encoder or editing process may produce.". 2245 Applicable to the MPEG1, MPEG2, MPEG4 encoders.</entry> 2246 </row> 2247 2248 <row><entry></entry></row> 2249 <row id="v4l2-mpeg-video-vbv-delay"> 2250 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_DELAY</constant> </entry> 2251 <entry>integer</entry> 2252 </row><row><entry spanname="descr">Sets the initial delay in milliseconds for 2253 VBV buffer control.</entry> 2254 </row> 2255 2256 <row><entry></entry></row> 2257 <row> 2258 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE</constant> </entry> 2259 <entry>integer</entry> 2260 </row> 2261 <row><entry spanname="descr">The Coded Picture Buffer size in kilobytes, it is used as a limitation of frame skip. 2262 The CPB is defined in the H264 standard as a mean to verify that the produced stream will be successfully decoded. 2263 Applicable to the H264 encoder.</entry> 2264 </row> 2265 2266 <row><entry></entry></row> 2267 <row> 2268 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_PERIOD</constant> </entry> 2269 <entry>integer</entry> 2270 </row> 2271 <row><entry spanname="descr">Period between I-frames in the open GOP for H264. In case of an open GOP 2272 this is the period between two I-frames. The period between IDR (Instantaneous Decoding Refresh) frames is taken from the GOP_SIZE control. 2273 An IDR frame, which stands for Instantaneous Decoding Refresh is an I-frame after which no prior frames are 2274 referenced. This means that a stream can be restarted from an IDR frame without the need to store or decode any 2275 previous frames. Applicable to the H264 encoder.</entry> 2276 </row> 2277 2278 <row><entry></entry></row> 2279 <row id="v4l2-mpeg-video-header-mode"> 2280 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_HEADER_MODE</constant> </entry> 2281 <entry>enum v4l2_mpeg_video_header_mode</entry> 2282 </row> 2283 <row><entry spanname="descr">Determines whether the header is returned as the first buffer or is 2284 it returned together with the first frame. Applicable to encoders. 2285 Possible values are:</entry> 2286 </row> 2287 <row> 2288 <entrytbl spanname="descr" cols="2"> 2289 <tbody valign="top"> 2290 <row> 2291 <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE</constant> </entry> 2292 <entry>The stream header is returned separately in the first buffer.</entry> 2293 </row> 2294 <row> 2295 <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME</constant> </entry> 2296 <entry>The stream header is returned together with the first encoded frame.</entry> 2297 </row> 2298 </tbody> 2299 </entrytbl> 2300 </row> 2301 <row><entry></entry></row> 2302 <row> 2303 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER</constant> </entry> 2304 <entry>boolean</entry> 2305 </row><row><entry spanname="descr">Enabled the deblocking post processing filter for MPEG4 decoder. 2306 Applicable to the MPEG4 decoder.</entry> 2307 </row> 2308 <row><entry></entry></row> 2309 <row> 2310 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_RES</constant> </entry> 2311 <entry>integer</entry> 2312 </row><row><entry spanname="descr">vop_time_increment_resolution value for MPEG4. Applicable to the MPEG4 encoder.</entry> 2313 </row> 2314 <row><entry></entry></row> 2315 <row> 2316 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_INC</constant> </entry> 2317 <entry>integer</entry> 2318 </row><row><entry spanname="descr">vop_time_increment value for MPEG4. Applicable to the MPEG4 encoder.</entry> 2319 </row> 2320 2321 <row><entry></entry></row> 2322 <row> 2323 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING</constant> </entry> 2324 <entry>boolean</entry> 2325 </row> 2326 <row><entry spanname="descr">Enable generation of frame packing supplemental enhancement information in the encoded bitstream. 2327 The frame packing SEI message contains the arrangement of L and R planes for 3D viewing. Applicable to the H264 encoder.</entry> 2328 </row> 2329 2330 <row><entry></entry></row> 2331 <row> 2332 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0</constant> </entry> 2333 <entry>boolean</entry> 2334 </row> 2335 <row><entry spanname="descr">Sets current frame as frame0 in frame packing SEI. 2336 Applicable to the H264 encoder.</entry> 2337 </row> 2338 2339 <row><entry></entry></row> 2340 <row id="v4l2-mpeg-video-h264-sei-fp-arrangement-type"> 2341 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE</constant> </entry> 2342 <entry>enum v4l2_mpeg_video_h264_sei_fp_arrangement_type</entry> 2343 </row> 2344 <row><entry spanname="descr">Frame packing arrangement type for H264 SEI. 2345 Applicable to the H264 encoder. 2346 Possible values are:</entry> 2347 </row> 2348 <row> 2349 <entrytbl spanname="descr" cols="2"> 2350 <tbody valign="top"> 2351 <row> 2352 <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD</constant> </entry> 2353 <entry>Pixels are alternatively from L and R.</entry> 2354 </row> 2355 <row> 2356 <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN</constant> </entry> 2357 <entry>L and R are interlaced by column.</entry> 2358 </row> 2359 <row> 2360 <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW</constant> </entry> 2361 <entry>L and R are interlaced by row.</entry> 2362 </row> 2363 <row> 2364 <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE</constant> </entry> 2365 <entry>L is on the left, R on the right.</entry> 2366 </row> 2367 <row> 2368 <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM</constant> </entry> 2369 <entry>L is on top, R on bottom.</entry> 2370 </row> 2371 <row> 2372 <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL</constant> </entry> 2373 <entry>One view per frame.</entry> 2374 </row> 2375 </tbody> 2376 </entrytbl> 2377 </row> 2378 2379 <row><entry></entry></row> 2380 <row> 2381 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO</constant> </entry> 2382 <entry>boolean</entry> 2383 </row> 2384 <row><entry spanname="descr">Enables flexible macroblock ordering in the encoded bitstream. It is a technique 2385 used for restructuring the ordering of macroblocks in pictures. Applicable to the H264 encoder.</entry> 2386 </row> 2387 2388 <row><entry></entry></row> 2389 <row id="v4l2-mpeg-video-h264-fmo-map-type"> 2390 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE</constant> </entry> 2391 <entry>enum v4l2_mpeg_video_h264_fmo_map_type</entry> 2392 </row> 2393 <row><entry spanname="descr">When using FMO, the map type divides the image in different scan patterns of macroblocks. 2394 Applicable to the H264 encoder. 2395 Possible values are:</entry> 2396 </row> 2397 <row> 2398 <entrytbl spanname="descr" cols="2"> 2399 <tbody valign="top"> 2400 <row> 2401 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES</constant> </entry> 2402 <entry>Slices are interleaved one after other with macroblocks in run length order.</entry> 2403 </row> 2404 <row> 2405 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES</constant> </entry> 2406 <entry>Scatters the macroblocks based on a mathematical function known to both encoder and decoder.</entry> 2407 </row> 2408 <row> 2409 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER</constant> </entry> 2410 <entry>Macroblocks arranged in rectangular areas or regions of interest.</entry> 2411 </row> 2412 <row> 2413 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT</constant> </entry> 2414 <entry>Slice groups grow in a cyclic way from centre to outwards.</entry> 2415 </row> 2416 <row> 2417 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN</constant> </entry> 2418 <entry>Slice groups grow in raster scan pattern from left to right.</entry> 2419 </row> 2420 <row> 2421 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN</constant> </entry> 2422 <entry>Slice groups grow in wipe scan pattern from top to bottom.</entry> 2423 </row> 2424 <row> 2425 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT</constant> </entry> 2426 <entry>User defined map type.</entry> 2427 </row> 2428 </tbody> 2429 </entrytbl> 2430 </row> 2431 2432 <row><entry></entry></row> 2433 <row> 2434 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP</constant> </entry> 2435 <entry>integer</entry> 2436 </row> 2437 <row><entry spanname="descr">Number of slice groups in FMO. 2438 Applicable to the H264 encoder.</entry> 2439 </row> 2440 2441 <row><entry></entry></row> 2442 <row id="v4l2-mpeg-video-h264-fmo-change-direction"> 2443 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION</constant> </entry> 2444 <entry>enum v4l2_mpeg_video_h264_fmo_change_dir</entry> 2445 </row> 2446 <row><entry spanname="descr">Specifies a direction of the slice group change for raster and wipe maps. 2447 Applicable to the H264 encoder. 2448 Possible values are:</entry> 2449 </row> 2450 <row> 2451 <entrytbl spanname="descr" cols="2"> 2452 <tbody valign="top"> 2453 <row> 2454 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT</constant> </entry> 2455 <entry>Raster scan or wipe right.</entry> 2456 </row> 2457 <row> 2458 <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT</constant> </entry> 2459 <entry>Reverse raster scan or wipe left.</entry> 2460 </row> 2461 </tbody> 2462 </entrytbl> 2463 </row> 2464 2465 <row><entry></entry></row> 2466 <row> 2467 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE</constant> </entry> 2468 <entry>integer</entry> 2469 </row> 2470 <row><entry spanname="descr">Specifies the size of the first slice group for raster and wipe map. 2471 Applicable to the H264 encoder.</entry> 2472 </row> 2473 2474 <row><entry></entry></row> 2475 <row> 2476 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH</constant> </entry> 2477 <entry>integer</entry> 2478 </row> 2479 <row><entry spanname="descr">Specifies the number of consecutive macroblocks for the interleaved map. 2480 Applicable to the H264 encoder.</entry> 2481 </row> 2482 2483 <row><entry></entry></row> 2484 <row> 2485 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO</constant> </entry> 2486 <entry>boolean</entry> 2487 </row> 2488 <row><entry spanname="descr">Enables arbitrary slice ordering in encoded bitstream. 2489 Applicable to the H264 encoder.</entry> 2490 </row> 2491 2492 <row><entry></entry></row> 2493 <row> 2494 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER</constant> </entry> 2495 <entry>integer</entry> 2496 </row><row><entry spanname="descr">Specifies the slice order in ASO. Applicable to the H264 encoder. 2497 The supplied 32-bit integer is interpreted as follows (bit 2498 0 = least significant bit):</entry> 2499 </row> 2500 <row> 2501 <entrytbl spanname="descr" cols="2"> 2502 <tbody valign="top"> 2503 <row> 2504 <entry>Bit 0:15</entry> 2505 <entry>Slice ID</entry> 2506 </row> 2507 <row> 2508 <entry>Bit 16:32</entry> 2509 <entry>Slice position or order</entry> 2510 </row> 2511 </tbody> 2512 </entrytbl> 2513 </row> 2514 2515 <row><entry></entry></row> 2516 <row> 2517 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING</constant> </entry> 2518 <entry>boolean</entry> 2519 </row> 2520 <row><entry spanname="descr">Enables H264 hierarchical coding. 2521 Applicable to the H264 encoder.</entry> 2522 </row> 2523 2524 <row><entry></entry></row> 2525 <row id="v4l2-mpeg-video-h264-hierarchical-coding-type"> 2526 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE</constant> </entry> 2527 <entry>enum v4l2_mpeg_video_h264_hierarchical_coding_type</entry> 2528 </row> 2529 <row><entry spanname="descr">Specifies the hierarchical coding type. 2530 Applicable to the H264 encoder. 2531 Possible values are:</entry> 2532 </row> 2533 <row> 2534 <entrytbl spanname="descr" cols="2"> 2535 <tbody valign="top"> 2536 <row> 2537 <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B</constant> </entry> 2538 <entry>Hierarchical B coding.</entry> 2539 </row> 2540 <row> 2541 <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P</constant> </entry> 2542 <entry>Hierarchical P coding.</entry> 2543 </row> 2544 </tbody> 2545 </entrytbl> 2546 </row> 2547 2548 <row><entry></entry></row> 2549 <row> 2550 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER</constant> </entry> 2551 <entry>integer</entry> 2552 </row> 2553 <row><entry spanname="descr">Specifies the number of hierarchical coding layers. 2554 Applicable to the H264 encoder.</entry> 2555 </row> 2556 2557 <row><entry></entry></row> 2558 <row> 2559 <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP</constant> </entry> 2560 <entry>integer</entry> 2561 </row><row><entry spanname="descr">Specifies a user defined QP for each layer. Applicable to the H264 encoder. 2562 The supplied 32-bit integer is interpreted as follows (bit 2563 0 = least significant bit):</entry> 2564 </row> 2565 <row> 2566 <entrytbl spanname="descr" cols="2"> 2567 <tbody valign="top"> 2568 <row> 2569 <entry>Bit 0:15</entry> 2570 <entry>QP value</entry> 2571 </row> 2572 <row> 2573 <entry>Bit 16:32</entry> 2574 <entry>Layer number</entry> 2575 </row> 2576 </tbody> 2577 </entrytbl> 2578 </row> 2579 2580 </tbody> 2581 </tgroup> 2582 </table> 2583 </section> 2584 2585 <section> 2586 <title>MFC 5.1 MPEG Controls</title> 2587 2588 <para>The following MPEG class controls deal with MPEG 2589 decoding and encoding settings that are specific to the Multi Format Codec 5.1 device present 2590 in the S5P family of SoCs by Samsung. 2591 </para> 2592 2593 <table pgwide="1" frame="none" id="mfc51-control-id"> 2594 <title>MFC 5.1 Control IDs</title> 2595 <tgroup cols="4"> 2596 <colspec colname="c1" colwidth="1*" /> 2597 <colspec colname="c2" colwidth="6*" /> 2598 <colspec colname="c3" colwidth="2*" /> 2599 <colspec colname="c4" colwidth="6*" /> 2600 <spanspec namest="c1" nameend="c2" spanname="id" /> 2601 <spanspec namest="c2" nameend="c4" spanname="descr" /> 2602 <thead> 2603 <row> 2604 <entry spanname="id" align="left">ID</entry> 2605 <entry align="left">Type</entry> 2606 </row><row><entry spanname="descr" align="left">Description</entry> 2607 </row> 2608 </thead> 2609 <tbody valign="top"> 2610 <row><entry></entry></row> 2611 <row> 2612 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY_ENABLE</constant> </entry> 2613 <entry>integer</entry> 2614 </row><row><entry spanname="descr">If the display delay is enabled then the decoder has to return a 2615 CAPTURE buffer after processing a certain number of OUTPUT buffers. If this number is low, then it may result in 2616 buffers not being dequeued in display order. In addition hardware may still use those buffers as reference, thus 2617 application should not write to those buffers. This feature can be used for example for generating thumbnails of videos. 2618 Applicable to the H264 decoder. 2619 </entry> 2620 </row> 2621 <row><entry></entry></row> 2622 <row> 2623 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant> </entry> 2624 <entry>integer</entry> 2625 </row><row><entry spanname="descr">Display delay value for H264 decoder. 2626 The decoder is forced to return a decoded frame after the set 'display delay' number of frames. If this number is 2627 low it may result in frames returned out of dispaly order, in addition the hardware may still be using the returned buffer 2628 as a reference picture for subsequent frames. 2629 </entry> 2630 </row> 2631 <row><entry></entry></row> 2632 <row> 2633 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P</constant> </entry> 2634 <entry>integer</entry> 2635 </row><row><entry spanname="descr">The number of reference pictures used for encoding a P picture. 2636 Applicable to the H264 encoder.</entry> 2637 </row> 2638 <row><entry></entry></row> 2639 <row> 2640 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING</constant> </entry> 2641 <entry>boolean</entry> 2642 </row><row><entry spanname="descr">Padding enable in the encoder - use a color instead of repeating border pixels. 2643 Applicable to encoders.</entry> 2644 </row> 2645 <row><entry></entry></row> 2646 <row> 2647 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING_YUV</constant> </entry> 2648 <entry>integer</entry> 2649 </row><row><entry spanname="descr">Padding color in the encoder. Applicable to encoders. The supplied 32-bit integer is interpreted as follows (bit 2650 0 = least significant bit):</entry> 2651 </row> 2652 <row> 2653 <entrytbl spanname="descr" cols="2"> 2654 <tbody valign="top"> 2655 <row> 2656 <entry>Bit 0:7</entry> 2657 <entry>V chrominance information</entry> 2658 </row> 2659 <row> 2660 <entry>Bit 8:15</entry> 2661 <entry>U chrominance information</entry> 2662 </row> 2663 <row> 2664 <entry>Bit 16:23</entry> 2665 <entry>Y luminance information</entry> 2666 </row> 2667 <row> 2668 <entry>Bit 24:31</entry> 2669 <entry>Must be zero.</entry> 2670 </row> 2671 </tbody> 2672 </entrytbl> 2673 </row> 2674 <row><entry></entry></row> 2675 <row> 2676 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_REACTION_COEFF</constant> </entry> 2677 <entry>integer</entry> 2678 </row><row><entry spanname="descr">Reaction coefficient for MFC rate control. Applicable to encoders. 2679 <para>Note 1: Valid only when the frame level RC is enabled.</para> 2680 <para>Note 2: For tight CBR, this field must be small (ex. 2 ~ 10). 2681 For VBR, this field must be large (ex. 100 ~ 1000).</para> 2682 <para>Note 3: It is not recommended to use the greater number than FRAME_RATE * (10^9 / BIT_RATE).</para> 2683 </entry> 2684 </row> 2685 <row><entry></entry></row> 2686 <row> 2687 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_DARK</constant> </entry> 2688 <entry>boolean</entry> 2689 </row><row><entry spanname="descr">Adaptive rate control for dark region. 2690 Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). 2691 Applicable to the H264 encoder.</entry> 2692 </row> 2693 <row><entry></entry></row> 2694 <row> 2695 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_SMOOTH</constant> </entry> 2696 <entry>boolean</entry> 2697 </row><row><entry spanname="descr">Adaptive rate control for smooth region. 2698 Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). 2699 Applicable to the H264 encoder.</entry> 2700 </row> 2701 <row><entry></entry></row> 2702 <row> 2703 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC</constant> </entry> 2704 <entry>boolean</entry> 2705 </row><row><entry spanname="descr">Adaptive rate control for static region. 2706 Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). 2707 Applicable to the H264 encoder.</entry> 2708 </row> 2709 <row><entry></entry></row> 2710 <row> 2711 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_ACTIVITY</constant> </entry> 2712 <entry>boolean</entry> 2713 </row><row><entry spanname="descr">Adaptive rate control for activity region. 2714 Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). 2715 Applicable to the H264 encoder.</entry> 2716 </row> 2717 <row><entry></entry></row> 2718 <row id="v4l2-mpeg-mfc51-video-frame-skip-mode"> 2719 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE</constant> </entry> 2720 <entry>enum v4l2_mpeg_mfc51_video_frame_skip_mode</entry> 2721 </row> 2722 <row><entry spanname="descr"> 2723 Indicates in what conditions the encoder should skip frames. If encoding a frame would cause the encoded stream to be larger then 2724 a chosen data limit then the frame will be skipped. 2725 Possible values are:</entry> 2726 </row> 2727 <row> 2728 <entrytbl spanname="descr" cols="2"> 2729 <tbody valign="top"> 2730 <row> 2731 <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_DISABLED</constant> </entry> 2732 <entry>Frame skip mode is disabled.</entry> 2733 </row> 2734 <row> 2735 <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT</constant> </entry> 2736 <entry>Frame skip mode enabled and buffer limit is set by the chosen level and is defined by the standard.</entry> 2737 </row> 2738 <row> 2739 <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT</constant> </entry> 2740 <entry>Frame skip mode enabled and buffer limit is set by the VBV (MPEG1/2/4) or CPB (H264) buffer size control.</entry> 2741 </row> 2742 </tbody> 2743 </entrytbl> 2744 </row> 2745 <row><entry></entry></row> 2746 <row> 2747 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_FIXED_TARGET_BIT</constant> </entry> 2748 <entry>integer</entry> 2749 </row><row><entry spanname="descr">Enable rate-control with fixed target bit. 2750 If this setting is enabled, then the rate control logic of the encoder will calculate the average bitrate 2751 for a GOP and keep it below or equal the set bitrate target. Otherwise the rate control logic calculates the 2752 overall average bitrate for the stream and keeps it below or equal to the set bitrate. In the first case 2753 the average bitrate for the whole stream will be smaller then the set bitrate. This is caused because the 2754 average is calculated for smaller number of frames, on the other hand enabling this setting will ensure that 2755 the stream will meet tight bandwidth contraints. Applicable to encoders. 2756 </entry> 2757 </row> 2758 <row><entry></entry></row> 2759 <row id="v4l2-mpeg-mfc51-video-force-frame-type"> 2760 <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE</constant> </entry> 2761 <entry>enum v4l2_mpeg_mfc51_video_force_frame_type</entry> 2762 </row> 2763 <row><entry spanname="descr">Force a frame type for the next queued buffer. Applicable to encoders. 2764 Possible values are:</entry> 2765 </row> 2766 <row> 2767 <entrytbl spanname="descr" cols="2"> 2768 <tbody valign="top"> 2769 <row> 2770 <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_DISABLED</constant> </entry> 2771 <entry>Forcing a specific frame type disabled.</entry> 2772 </row> 2773 <row> 2774 <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME</constant> </entry> 2775 <entry>Force an I-frame.</entry> 2776 </row> 2777 <row> 2778 <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED</constant> </entry> 2779 <entry>Force a non-coded frame.</entry> 2780 </row> 2781 </tbody> 2782 </entrytbl> 2783 </row> 2784 </tbody> 2785 </tgroup> 2786 </table> 2787 </section> 2788 2789 <section> 2790 <title>CX2341x MPEG Controls</title> 2791 2792 <para>The following MPEG class controls deal with MPEG 2793 encoding settings that are specific to the Conexant CX23415 and 2794 CX23416 MPEG encoding chips.</para> 2795 2796 <table pgwide="1" frame="none" id="cx2341x-control-id"> 2797 <title>CX2341x Control IDs</title> 2798 <tgroup cols="4"> 2799 <colspec colname="c1" colwidth="1*" /> 2800 <colspec colname="c2" colwidth="6*" /> 2801 <colspec colname="c3" colwidth="2*" /> 2802 <colspec colname="c4" colwidth="6*" /> 2803 <spanspec namest="c1" nameend="c2" spanname="id" /> 2804 <spanspec namest="c2" nameend="c4" spanname="descr" /> 2805 <thead> 2806 <row> 2807 <entry spanname="id" align="left">ID</entry> 2808 <entry align="left">Type</entry> 2809 </row><row><entry spanname="descr" align="left">Description</entry> 2810 </row> 2811 </thead> 2812 <tbody valign="top"> 2813 <row><entry></entry></row> 2814 <row id="v4l2-mpeg-cx2341x-video-spatial-filter-mode"> 2815 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE</constant> </entry> 2816 <entry>enum v4l2_mpeg_cx2341x_video_spatial_filter_mode</entry> 2817 </row><row><entry spanname="descr">Sets the Spatial 2818 Filter mode (default <constant>MANUAL</constant>). Possible values 2819 are:</entry> 2820 </row> 2821 <row> 2822 <entrytbl spanname="descr" cols="2"> 2823 <tbody valign="top"> 2824 <row> 2825 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_MANUAL</constant> </entry> 2826 <entry>Choose the filter manually</entry> 2827 </row> 2828 <row> 2829 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO</constant> </entry> 2830 <entry>Choose the filter automatically</entry> 2831 </row> 2832 </tbody> 2833 </entrytbl> 2834 </row> 2835 <row><entry></entry></row> 2836 <row> 2837 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER</constant> </entry> 2838 <entry>integer (0-15)</entry> 2839 </row><row><entry spanname="descr">The setting for the 2840 Spatial Filter. 0 = off, 15 = maximum. (Default is 0.)</entry> 2841 </row> 2842 <row><entry></entry></row> 2843 <row id="luma-spatial-filter-type"> 2844 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE</constant> </entry> 2845 <entry>enum v4l2_mpeg_cx2341x_video_luma_spatial_filter_type</entry> 2846 </row><row><entry spanname="descr">Select the algorithm 2847 to use for the Luma Spatial Filter (default 2848 <constant>1D_HOR</constant>). Possible values:</entry> 2849 </row> 2850 <row> 2851 <entrytbl spanname="descr" cols="2"> 2852 <tbody valign="top"> 2853 <row> 2854 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_OFF</constant> </entry> 2855 <entry>No filter</entry> 2856 </row> 2857 <row> 2858 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR</constant> </entry> 2859 <entry>One-dimensional horizontal</entry> 2860 </row> 2861 <row> 2862 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT</constant> </entry> 2863 <entry>One-dimensional vertical</entry> 2864 </row> 2865 <row> 2866 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE</constant> </entry> 2867 <entry>Two-dimensional separable</entry> 2868 </row> 2869 <row> 2870 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE</constant> </entry> 2871 <entry>Two-dimensional symmetrical 2872 non-separable</entry> 2873 </row> 2874 </tbody> 2875 </entrytbl> 2876 </row> 2877 <row><entry></entry></row> 2878 <row id="chroma-spatial-filter-type"> 2879 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE</constant> </entry> 2880 <entry>enum v4l2_mpeg_cx2341x_video_chroma_spatial_filter_type</entry> 2881 </row><row><entry spanname="descr">Select the algorithm 2882 for the Chroma Spatial Filter (default <constant>1D_HOR</constant>). 2883 Possible values are:</entry> 2884 </row> 2885 <row> 2886 <entrytbl spanname="descr" cols="2"> 2887 <tbody valign="top"> 2888 <row> 2889 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_OFF</constant> </entry> 2890 <entry>No filter</entry> 2891 </row> 2892 <row> 2893 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR</constant> </entry> 2894 <entry>One-dimensional horizontal</entry> 2895 </row> 2896 </tbody> 2897 </entrytbl> 2898 </row> 2899 <row><entry></entry></row> 2900 <row id="v4l2-mpeg-cx2341x-video-temporal-filter-mode"> 2901 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE</constant> </entry> 2902 <entry>enum v4l2_mpeg_cx2341x_video_temporal_filter_mode</entry> 2903 </row><row><entry spanname="descr">Sets the Temporal 2904 Filter mode (default <constant>MANUAL</constant>). Possible values 2905 are:</entry> 2906 </row> 2907 <row> 2908 <entrytbl spanname="descr" cols="2"> 2909 <tbody valign="top"> 2910 <row> 2911 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_MANUAL</constant> </entry> 2912 <entry>Choose the filter manually</entry> 2913 </row> 2914 <row> 2915 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO</constant> </entry> 2916 <entry>Choose the filter automatically</entry> 2917 </row> 2918 </tbody> 2919 </entrytbl> 2920 </row> 2921 <row><entry></entry></row> 2922 <row> 2923 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER</constant> </entry> 2924 <entry>integer (0-31)</entry> 2925 </row><row><entry spanname="descr">The setting for the 2926 Temporal Filter. 0 = off, 31 = maximum. (Default is 8 for full-scale 2927 capturing and 0 for scaled capturing.)</entry> 2928 </row> 2929 <row><entry></entry></row> 2930 <row id="v4l2-mpeg-cx2341x-video-median-filter-type"> 2931 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE</constant> </entry> 2932 <entry>enum v4l2_mpeg_cx2341x_video_median_filter_type</entry> 2933 </row><row><entry spanname="descr">Median Filter Type 2934 (default <constant>OFF</constant>). Possible values are:</entry> 2935 </row> 2936 <row> 2937 <entrytbl spanname="descr" cols="2"> 2938 <tbody valign="top"> 2939 <row> 2940 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_OFF</constant> </entry> 2941 <entry>No filter</entry> 2942 </row> 2943 <row> 2944 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR</constant> </entry> 2945 <entry>Horizontal filter</entry> 2946 </row> 2947 <row> 2948 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT</constant> </entry> 2949 <entry>Vertical filter</entry> 2950 </row> 2951 <row> 2952 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT</constant> </entry> 2953 <entry>Horizontal and vertical filter</entry> 2954 </row> 2955 <row> 2956 <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG</constant> </entry> 2957 <entry>Diagonal filter</entry> 2958 </row> 2959 </tbody> 2960 </entrytbl> 2961 </row> 2962 <row><entry></entry></row> 2963 <row> 2964 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_BOTTOM</constant> </entry> 2965 <entry>integer (0-255)</entry> 2966 </row><row><entry spanname="descr">Threshold above which 2967 the luminance median filter is enabled (default 0)</entry> 2968 </row> 2969 <row><entry></entry></row> 2970 <row> 2971 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_TOP</constant> </entry> 2972 <entry>integer (0-255)</entry> 2973 </row><row><entry spanname="descr">Threshold below which 2974 the luminance median filter is enabled (default 255)</entry> 2975 </row> 2976 <row><entry></entry></row> 2977 <row> 2978 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_BOTTOM</constant> </entry> 2979 <entry>integer (0-255)</entry> 2980 </row><row><entry spanname="descr">Threshold above which 2981 the chroma median filter is enabled (default 0)</entry> 2982 </row> 2983 <row><entry></entry></row> 2984 <row> 2985 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_TOP</constant> </entry> 2986 <entry>integer (0-255)</entry> 2987 </row><row><entry spanname="descr">Threshold below which 2988 the chroma median filter is enabled (default 255)</entry> 2989 </row> 2990 <row><entry></entry></row> 2991 <row> 2992 <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_STREAM_INSERT_NAV_PACKETS</constant> </entry> 2993 <entry>boolean</entry> 2994 </row> 2995 <row><entry spanname="descr">The CX2341X MPEG encoder 2996 can insert one empty MPEG-2 PES packet into the stream between every 2997 four video frames. The packet size is 2048 bytes, including the 2998 packet_start_code_prefix and stream_id fields. The stream_id is 0xBF 2999 (private stream 2). The payload consists of 0x00 bytes, to be filled 3000 in by the application. 0 = do not insert, 1 = insert packets.</entry> 3001 </row> 3002 </tbody> 3003 </tgroup> 3004 </table> 3005 </section> 3006 </section> 3007 3008 <section id="camera-controls"> 3009 <title>Camera Control Reference</title> 3010 3011 <para>The Camera class includes controls for mechanical (or 3012 equivalent digital) features of a device such as controllable lenses 3013 or sensors.</para> 3014 3015 <table pgwide="1" frame="none" id="camera-control-id"> 3016 <title>Camera Control IDs</title> 3017 <tgroup cols="4"> 3018 <colspec colname="c1" colwidth="1*" /> 3019 <colspec colname="c2" colwidth="6*" /> 3020 <colspec colname="c3" colwidth="2*" /> 3021 <colspec colname="c4" colwidth="6*" /> 3022 <spanspec namest="c1" nameend="c2" spanname="id" /> 3023 <spanspec namest="c2" nameend="c4" spanname="descr" /> 3024 <thead> 3025 <row> 3026 <entry spanname="id" align="left">ID</entry> 3027 <entry align="left">Type</entry> 3028 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 3029 </row> 3030 </thead> 3031 <tbody valign="top"> 3032 <row><entry></entry></row> 3033 <row> 3034 <entry spanname="id"><constant>V4L2_CID_CAMERA_CLASS</constant> </entry> 3035 <entry>class</entry> 3036 </row><row><entry spanname="descr">The Camera class 3037 descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a 3038 description of this control class.</entry> 3039 </row> 3040 <row><entry></entry></row> 3041 3042 <row id="v4l2-exposure-auto-type"> 3043 <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO</constant> </entry> 3044 <entry>enum v4l2_exposure_auto_type</entry> 3045 </row><row><entry spanname="descr">Enables automatic 3046 adjustments of the exposure time and/or iris aperture. The effect of 3047 manual changes of the exposure time or iris aperture while these 3048 features are enabled is undefined, drivers should ignore such 3049 requests. Possible values are:</entry> 3050 </row> 3051 <row> 3052 <entrytbl spanname="descr" cols="2"> 3053 <tbody valign="top"> 3054 <row> 3055 <entry><constant>V4L2_EXPOSURE_AUTO</constant> </entry> 3056 <entry>Automatic exposure time, automatic iris 3057 aperture.</entry> 3058 </row> 3059 <row> 3060 <entry><constant>V4L2_EXPOSURE_MANUAL</constant> </entry> 3061 <entry>Manual exposure time, manual iris.</entry> 3062 </row> 3063 <row> 3064 <entry><constant>V4L2_EXPOSURE_SHUTTER_PRIORITY</constant> </entry> 3065 <entry>Manual exposure time, auto iris.</entry> 3066 </row> 3067 <row> 3068 <entry><constant>V4L2_EXPOSURE_APERTURE_PRIORITY</constant> </entry> 3069 <entry>Auto exposure time, manual iris.</entry> 3070 </row> 3071 </tbody> 3072 </entrytbl> 3073 </row> 3074 <row><entry></entry></row> 3075 3076 <row> 3077 <entry spanname="id"><constant>V4L2_CID_EXPOSURE_ABSOLUTE</constant> </entry> 3078 <entry>integer</entry> 3079 </row><row><entry spanname="descr">Determines the exposure 3080 time of the camera sensor. The exposure time is limited by the frame 3081 interval. Drivers should interpret the values as 100 µs units, 3082 where the value 1 stands for 1/10000th of a second, 10000 for 1 second 3083 and 100000 for 10 seconds.</entry> 3084 </row> 3085 <row><entry></entry></row> 3086 3087 <row> 3088 <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO_PRIORITY</constant> </entry> 3089 <entry>boolean</entry> 3090 </row><row><entry spanname="descr">When 3091 <constant>V4L2_CID_EXPOSURE_AUTO</constant> is set to 3092 <constant>AUTO</constant> or <constant>APERTURE_PRIORITY</constant>, 3093 this control determines if the device may dynamically vary the frame 3094 rate. By default this feature is disabled (0) and the frame rate must 3095 remain constant.</entry> 3096 </row> 3097 <row><entry></entry></row> 3098 3099 <row> 3100 <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant> </entry> 3101 <entry>integer menu</entry> 3102 </row><row><entry spanname="descr"> Determines the automatic 3103 exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant> 3104 control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant> 3105 or <constant>APERTURE_PRIORITY</constant>. 3106 It is expressed in terms of EV, drivers should interpret the values as 0.001 EV 3107 units, where the value 1000 stands for +1 EV. 3108 <para>Increasing the exposure compensation value is equivalent to decreasing 3109 the exposure value (EV) and will increase the amount of light at the image 3110 sensor. The camera performs the exposure compensation by adjusting absolute 3111 exposure time and/or aperture.</para></entry> 3112 </row> 3113 <row><entry></entry></row> 3114 3115 <row id="v4l2-exposure-metering"> 3116 <entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant> </entry> 3117 <entry>enum v4l2_exposure_metering</entry> 3118 </row><row><entry spanname="descr">Determines how the camera measures 3119 the amount of light available for the frame exposure. Possible values are:</entry> 3120 </row> 3121 <row> 3122 <entrytbl spanname="descr" cols="2"> 3123 <tbody valign="top"> 3124 <row> 3125 <entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant> </entry> 3126 <entry>Use the light information coming from the entire frame 3127 and average giving no weighting to any particular portion of the metered area. 3128 </entry> 3129 </row> 3130 <row> 3131 <entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant> </entry> 3132 <entry>Average the light information coming from the entire frame 3133 giving priority to the center of the metered area.</entry> 3134 </row> 3135 <row> 3136 <entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant> </entry> 3137 <entry>Measure only very small area at the center of the frame.</entry> 3138 </row> 3139 </tbody> 3140 </entrytbl> 3141 </row> 3142 <row><entry></entry></row> 3143 3144 <row> 3145 <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant> </entry> 3146 <entry>integer</entry> 3147 </row><row><entry spanname="descr">This control turns the 3148 camera horizontally by the specified amount. The unit is undefined. A 3149 positive value moves the camera to the right (clockwise when viewed 3150 from above), a negative value to the left. A value of zero does not 3151 cause motion. This is a write-only control.</entry> 3152 </row> 3153 <row><entry></entry></row> 3154 3155 <row> 3156 <entry spanname="id"><constant>V4L2_CID_TILT_RELATIVE</constant> </entry> 3157 <entry>integer</entry> 3158 </row><row><entry spanname="descr">This control turns the 3159 camera vertically by the specified amount. The unit is undefined. A 3160 positive value moves the camera up, a negative value down. A value of 3161 zero does not cause motion. This is a write-only control.</entry> 3162 </row> 3163 <row><entry></entry></row> 3164 3165 <row> 3166 <entry spanname="id"><constant>V4L2_CID_PAN_RESET</constant> </entry> 3167 <entry>button</entry> 3168 </row><row><entry spanname="descr">When this control is set, 3169 the camera moves horizontally to the default position.</entry> 3170 </row> 3171 <row><entry></entry></row> 3172 3173 <row> 3174 <entry spanname="id"><constant>V4L2_CID_TILT_RESET</constant> </entry> 3175 <entry>button</entry> 3176 </row><row><entry spanname="descr">When this control is set, 3177 the camera moves vertically to the default position.</entry> 3178 </row> 3179 <row><entry></entry></row> 3180 3181 <row> 3182 <entry spanname="id"><constant>V4L2_CID_PAN_ABSOLUTE</constant> </entry> 3183 <entry>integer</entry> 3184 </row><row><entry spanname="descr">This control 3185 turns the camera horizontally to the specified position. Positive 3186 values move the camera to the right (clockwise when viewed from above), 3187 negative values to the left. Drivers should interpret the values as arc 3188 seconds, with valid values between -180 * 3600 and +180 * 3600 3189 inclusive.</entry> 3190 </row> 3191 <row><entry></entry></row> 3192 3193 <row> 3194 <entry spanname="id"><constant>V4L2_CID_TILT_ABSOLUTE</constant> </entry> 3195 <entry>integer</entry> 3196 </row><row><entry spanname="descr">This control 3197 turns the camera vertically to the specified position. Positive values 3198 move the camera up, negative values down. Drivers should interpret the 3199 values as arc seconds, with valid values between -180 * 3600 and +180 3200 * 3600 inclusive.</entry> 3201 </row> 3202 <row><entry></entry></row> 3203 3204 <row> 3205 <entry spanname="id"><constant>V4L2_CID_FOCUS_ABSOLUTE</constant> </entry> 3206 <entry>integer</entry> 3207 </row><row><entry spanname="descr">This control sets the 3208 focal point of the camera to the specified position. The unit is 3209 undefined. Positive values set the focus closer to the camera, 3210 negative values towards infinity.</entry> 3211 </row> 3212 <row><entry></entry></row> 3213 3214 <row> 3215 <entry spanname="id"><constant>V4L2_CID_FOCUS_RELATIVE</constant> </entry> 3216 <entry>integer</entry> 3217 </row><row><entry spanname="descr">This control moves the 3218 focal point of the camera by the specified amount. The unit is 3219 undefined. Positive values move the focus closer to the camera, 3220 negative values towards infinity. This is a write-only control.</entry> 3221 </row> 3222 <row><entry></entry></row> 3223 3224 <row> 3225 <entry spanname="id"><constant>V4L2_CID_FOCUS_AUTO</constant> </entry> 3226 <entry>boolean</entry> 3227 </row><row><entry spanname="descr">Enables continuous automatic 3228 focus adjustments. The effect of manual focus adjustments while this feature 3229 is enabled is undefined, drivers should ignore such requests.</entry> 3230 </row> 3231 <row><entry></entry></row> 3232 3233 <row> 3234 <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_START</constant> </entry> 3235 <entry>button</entry> 3236 </row><row><entry spanname="descr">Starts single auto focus process. 3237 The effect of setting this control when <constant>V4L2_CID_FOCUS_AUTO</constant> 3238 is set to <constant>TRUE</constant> (1) is undefined, drivers should ignore 3239 such requests.</entry> 3240 </row> 3241 <row><entry></entry></row> 3242 3243 <row> 3244 <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_STOP</constant> </entry> 3245 <entry>button</entry> 3246 </row><row><entry spanname="descr">Aborts automatic focusing 3247 started with <constant>V4L2_CID_AUTO_FOCUS_START</constant> control. It is 3248 effective only when the continuous autofocus is disabled, that is when 3249 <constant>V4L2_CID_FOCUS_AUTO</constant> control is set to <constant>FALSE 3250 </constant> (0).</entry> 3251 </row> 3252 <row><entry></entry></row> 3253 3254 <row id="v4l2-auto-focus-status"> 3255 <entry spanname="id"> 3256 <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant> </entry> 3257 <entry>bitmask</entry> 3258 </row> 3259 <row><entry spanname="descr">The automatic focus status. This is a read-only 3260 control.</entry> 3261 </row> 3262 <row> 3263 <entrytbl spanname="descr" cols="2"> 3264 <tbody valign="top"> 3265 <row> 3266 <entry><constant>V4L2_AUTO_FOCUS_STATUS_IDLE</constant> </entry> 3267 <entry>Automatic focus is not active.</entry> 3268 </row> 3269 <row> 3270 <entry><constant>V4L2_AUTO_FOCUS_STATUS_BUSY</constant> </entry> 3271 <entry>Automatic focusing is in progress.</entry> 3272 </row> 3273 <row> 3274 <entry><constant>V4L2_AUTO_FOCUS_STATUS_REACHED</constant> </entry> 3275 <entry>Focus has been reached.</entry> 3276 </row> 3277 <row> 3278 <entry><constant>V4L2_AUTO_FOCUS_STATUS_FAILED</constant> </entry> 3279 <entry>Automatic focus has failed, the driver will not 3280 transition from this state until another action is 3281 performed by an application.</entry> 3282 </row> 3283 </tbody> 3284 </entrytbl> 3285 </row> 3286 <row><entry spanname="descr"> 3287 Setting <constant>V4L2_LOCK_FOCUS</constant> lock bit of the <constant>V4L2_CID_3A_LOCK 3288 </constant> control may stop updates of the <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant> 3289 control value.</entry> 3290 </row> 3291 <row><entry></entry></row> 3292 3293 <row id="v4l2-auto-focus-range"> 3294 <entry spanname="id"> 3295 <constant>V4L2_CID_AUTO_FOCUS_RANGE</constant> </entry> 3296 <entry>enum v4l2_auto_focus_range</entry> 3297 </row> 3298 <row><entry spanname="descr">Determines auto focus distance range 3299 for which lens may be adjusted. </entry> 3300 </row> 3301 <row> 3302 <entrytbl spanname="descr" cols="2"> 3303 <tbody valign="top"> 3304 <row> 3305 <entry><constant>V4L2_AUTO_FOCUS_RANGE_AUTO</constant> </entry> 3306 <entry>The camera automatically selects the focus range.</entry> 3307 </row> 3308 <row> 3309 <entry><constant>V4L2_AUTO_FOCUS_RANGE_NORMAL</constant> </entry> 3310 <entry>Normal distance range, limited for best automatic focus 3311 performance.</entry> 3312 </row> 3313 <row> 3314 <entry><constant>V4L2_AUTO_FOCUS_RANGE_MACRO</constant> </entry> 3315 <entry>Macro (close-up) auto focus. The camera will 3316 use its minimum possible distance for auto focus.</entry> 3317 </row> 3318 <row> 3319 <entry><constant>V4L2_AUTO_FOCUS_RANGE_INFINITY</constant> </entry> 3320 <entry>The lens is set to focus on an object at infinite distance.</entry> 3321 </row> 3322 </tbody> 3323 </entrytbl> 3324 </row> 3325 <row><entry></entry></row> 3326 3327 <row> 3328 <entry spanname="id"><constant>V4L2_CID_ZOOM_ABSOLUTE</constant> </entry> 3329 <entry>integer</entry> 3330 </row><row><entry spanname="descr">Specify the objective lens 3331 focal length as an absolute value. The zoom unit is driver-specific and its 3332 value should be a positive integer.</entry> 3333 </row> 3334 <row><entry></entry></row> 3335 3336 <row> 3337 <entry spanname="id"><constant>V4L2_CID_ZOOM_RELATIVE</constant> </entry> 3338 <entry>integer</entry> 3339 </row><row><entry spanname="descr">Specify the objective lens 3340 focal length relatively to the current value. Positive values move the zoom 3341 lens group towards the telephoto direction, negative values towards the 3342 wide-angle direction. The zoom unit is driver-specific. This is a write-only control.</entry> 3343 </row> 3344 <row><entry></entry></row> 3345 3346 <row> 3347 <entry spanname="id"><constant>V4L2_CID_ZOOM_CONTINUOUS</constant> </entry> 3348 <entry>integer</entry> 3349 </row><row><entry spanname="descr">Move the objective lens group 3350 at the specified speed until it reaches physical device limits or until an 3351 explicit request to stop the movement. A positive value moves the zoom lens 3352 group towards the telephoto direction. A value of zero stops the zoom lens 3353 group movement. A negative value moves the zoom lens group towards the 3354 wide-angle direction. The zoom speed unit is driver-specific.</entry> 3355 </row> 3356 <row><entry></entry></row> 3357 3358 <row> 3359 <entry spanname="id"><constant>V4L2_CID_IRIS_ABSOLUTE</constant> </entry> 3360 <entry>integer</entry> 3361 </row><row><entry spanname="descr">This control sets the 3362 camera's aperture to the specified value. The unit is undefined. 3363 Larger values open the iris wider, smaller values close it.</entry> 3364 </row> 3365 <row><entry></entry></row> 3366 3367 <row> 3368 <entry spanname="id"><constant>V4L2_CID_IRIS_RELATIVE</constant> </entry> 3369 <entry>integer</entry> 3370 </row><row><entry spanname="descr">This control modifies the 3371 camera's aperture by the specified amount. The unit is undefined. 3372 Positive values open the iris one step further, negative values close 3373 it one step further. This is a write-only control.</entry> 3374 </row> 3375 <row><entry></entry></row> 3376 3377 <row> 3378 <entry spanname="id"><constant>V4L2_CID_PRIVACY</constant> </entry> 3379 <entry>boolean</entry> 3380 </row><row><entry spanname="descr">Prevent video from being acquired 3381 by the camera. When this control is set to <constant>TRUE</constant> (1), no 3382 image can be captured by the camera. Common means to enforce privacy are 3383 mechanical obturation of the sensor and firmware image processing, but the 3384 device is not restricted to these methods. Devices that implement the privacy 3385 control must support read access and may support write access.</entry> 3386 </row> 3387 3388 <row> 3389 <entry spanname="id"><constant>V4L2_CID_BAND_STOP_FILTER</constant> </entry> 3390 <entry>integer</entry> 3391 </row><row><entry spanname="descr">Switch the band-stop filter of a 3392 camera sensor on or off, or specify its strength. Such band-stop filters can 3393 be used, for example, to filter out the fluorescent light component.</entry> 3394 </row> 3395 <row><entry></entry></row> 3396 3397 <row id="v4l2-auto-n-preset-white-balance"> 3398 <entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant> </entry> 3399 <entry>enum v4l2_auto_n_preset_white_balance</entry> 3400 </row><row><entry spanname="descr">Sets white balance to automatic, 3401 manual or a preset. The presets determine color temperature of the light as 3402 a hint to the camera for white balance adjustments resulting in most accurate 3403 color representation. The following white balance presets are listed in order 3404 of increasing color temperature.</entry> 3405 </row> 3406 <row> 3407 <entrytbl spanname="descr" cols="2"> 3408 <tbody valign="top"> 3409 <row> 3410 <entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant> </entry> 3411 <entry>Manual white balance.</entry> 3412 </row> 3413 <row> 3414 <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant> </entry> 3415 <entry>Automatic white balance adjustments.</entry> 3416 </row> 3417 <row> 3418 <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant> </entry> 3419 <entry>White balance setting for incandescent (tungsten) lighting. 3420 It generally cools down the colors and corresponds approximately to 2500...3500 K 3421 color temperature range.</entry> 3422 </row> 3423 <row> 3424 <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant> </entry> 3425 <entry>White balance preset for fluorescent lighting. 3426 It corresponds approximately to 4000...5000 K color temperature.</entry> 3427 </row> 3428 <row> 3429 <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant> </entry> 3430 <entry>With this setting the camera will compensate for 3431 fluorescent H lighting.</entry> 3432 </row> 3433 <row> 3434 <entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant> </entry> 3435 <entry>White balance setting for horizon daylight. 3436 It corresponds approximately to 5000 K color temperature.</entry> 3437 </row> 3438 <row> 3439 <entry><constant>V4L2_WHITE_BALANCE_DAYLIGHT</constant> </entry> 3440 <entry>White balance preset for daylight (with clear sky). 3441 It corresponds approximately to 5000...6500 K color temperature.</entry> 3442 </row> 3443 <row> 3444 <entry><constant>V4L2_WHITE_BALANCE_FLASH</constant> </entry> 3445 <entry>With this setting the camera will compensate for the flash 3446 light. It slightly warms up the colors and corresponds roughly to 5000...5500 K 3447 color temperature.</entry> 3448 </row> 3449 <row> 3450 <entry><constant>V4L2_WHITE_BALANCE_CLOUDY</constant> </entry> 3451 <entry>White balance preset for moderately overcast sky. 3452 This option corresponds approximately to 6500...8000 K color temperature 3453 range.</entry> 3454 </row> 3455 <row> 3456 <entry><constant>V4L2_WHITE_BALANCE_SHADE</constant> </entry> 3457 <entry>White balance preset for shade or heavily overcast 3458 sky. It corresponds approximately to 9000...10000 K color temperature. 3459 </entry> 3460 </row> 3461 </tbody> 3462 </entrytbl> 3463 </row> 3464 <row><entry></entry></row> 3465 3466 <row id="v4l2-wide-dynamic-range"> 3467 <entry spanname="id"><constant>V4L2_CID_WIDE_DYNAMIC_RANGE</constant></entry> 3468 <entry>boolean</entry> 3469 </row> 3470 <row> 3471 <entry spanname="descr">Enables or disables the camera's wide dynamic 3472 range feature. This feature allows to obtain clear images in situations where 3473 intensity of the illumination varies significantly throughout the scene, i.e. 3474 there are simultaneously very dark and very bright areas. It is most commonly 3475 realized in cameras by combining two subsequent frames with different exposure 3476 times. <footnote id="ctypeconv"><para> This control may be changed to a menu 3477 control in the future, if more options are required.</para></footnote></entry> 3478 </row> 3479 <row><entry></entry></row> 3480 3481 <row id="v4l2-image-stabilization"> 3482 <entry spanname="id"><constant>V4L2_CID_IMAGE_STABILIZATION</constant></entry> 3483 <entry>boolean</entry> 3484 </row> 3485 <row> 3486 <entry spanname="descr">Enables or disables image stabilization. 3487 <footnoteref linkend="ctypeconv"/></entry> 3488 </row> 3489 <row><entry></entry></row> 3490 3491 <row> 3492 <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY</constant> </entry> 3493 <entry>integer menu</entry> 3494 </row><row><entry spanname="descr">Determines ISO equivalent of an 3495 image sensor indicating the sensor's sensitivity to light. The numbers are 3496 expressed in arithmetic scale, as per <xref linkend="iso12232" /> standard, 3497 where doubling the sensor sensitivity is represented by doubling the numerical 3498 ISO value. Applications should interpret the values as standard ISO values 3499 multiplied by 1000, e.g. control value 800 stands for ISO 0.8. Drivers will 3500 usually support only a subset of standard ISO values. The effect of setting 3501 this control while the <constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> 3502 control is set to a value other than <constant>V4L2_CID_ISO_SENSITIVITY_MANUAL 3503 </constant> is undefined, drivers should ignore such requests.</entry> 3504 </row> 3505 <row><entry></entry></row> 3506 3507 <row id="v4l2-iso-sensitivity-auto-type"> 3508 <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> </entry> 3509 <entry>enum v4l2_iso_sensitivity_type</entry> 3510 </row><row><entry spanname="descr">Enables or disables automatic ISO 3511 sensitivity adjustments.</entry> 3512 </row> 3513 <row> 3514 <entrytbl spanname="descr" cols="2"> 3515 <tbody valign="top"> 3516 <row> 3517 <entry><constant>V4L2_CID_ISO_SENSITIVITY_MANUAL</constant> </entry> 3518 <entry>Manual ISO sensitivity.</entry> 3519 </row> 3520 <row> 3521 <entry><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> </entry> 3522 <entry>Automatic ISO sensitivity adjustments.</entry> 3523 </row> 3524 </tbody> 3525 </entrytbl> 3526 </row> 3527 <row><entry></entry></row> 3528 3529 <row id="v4l2-scene-mode"> 3530 <entry spanname="id"><constant>V4L2_CID_SCENE_MODE</constant> </entry> 3531 <entry>enum v4l2_scene_mode</entry> 3532 </row><row><entry spanname="descr">This control allows to select 3533 scene programs as the camera automatic modes optimized for common shooting 3534 scenes. Within these modes the camera determines best exposure, aperture, 3535 focusing, light metering, white balance and equivalent sensitivity. The 3536 controls of those parameters are influenced by the scene mode control. 3537 An exact behavior in each mode is subject to the camera specification. 3538 3539 <para>When the scene mode feature is not used, this control should be set to 3540 <constant>V4L2_SCENE_MODE_NONE</constant> to make sure the other possibly 3541 related controls are accessible. The following scene programs are defined: 3542 </para> 3543 </entry> 3544 </row> 3545 <row> 3546 <entrytbl spanname="descr" cols="2"> 3547 <tbody valign="top"> 3548 <row> 3549 <entry><constant>V4L2_SCENE_MODE_NONE</constant> </entry> 3550 <entry>The scene mode feature is disabled.</entry> 3551 </row> 3552 <row> 3553 <entry><constant>V4L2_SCENE_MODE_BACKLIGHT</constant> </entry> 3554 <entry>Backlight. Compensates for dark shadows when light is 3555 coming from behind a subject, also by automatically turning 3556 on the flash.</entry> 3557 </row> 3558 <row> 3559 <entry><constant>V4L2_SCENE_MODE_BEACH_SNOW</constant> </entry> 3560 <entry>Beach and snow. This mode compensates for all-white or 3561 bright scenes, which tend to look gray and low contrast, when camera's automatic 3562 exposure is based on an average scene brightness. To compensate, this mode 3563 automatically slightly overexposes the frames. The white balance may also be 3564 adjusted to compensate for the fact that reflected snow looks bluish rather 3565 than white.</entry> 3566 </row> 3567 <row> 3568 <entry><constant>V4L2_SCENE_MODE_CANDLELIGHT</constant> </entry> 3569 <entry>Candle light. The camera generally raises the ISO 3570 sensitivity and lowers the shutter speed. This mode compensates for relatively 3571 close subject in the scene. The flash is disabled in order to preserve the 3572 ambiance of the light.</entry> 3573 </row> 3574 <row> 3575 <entry><constant>V4L2_SCENE_MODE_DAWN_DUSK</constant> </entry> 3576 <entry>Dawn and dusk. Preserves the colors seen in low 3577 natural light before dusk and after down. The camera may turn off the flash, 3578 and automatically focus at infinity. It will usually boost saturation and 3579 lower the shutter speed.</entry> 3580 </row> 3581 <row> 3582 <entry><constant>V4L2_SCENE_MODE_FALL_COLORS</constant> </entry> 3583 <entry>Fall colors. Increases saturation and adjusts white 3584 balance for color enhancement. Pictures of autumn leaves get saturated reds 3585 and yellows.</entry> 3586 </row> 3587 <row> 3588 <entry><constant>V4L2_SCENE_MODE_FIREWORKS</constant> </entry> 3589 <entry>Fireworks. Long exposure times are used to capture 3590 the expanding burst of light from a firework. The camera may invoke image 3591 stabilization.</entry> 3592 </row> 3593 <row> 3594 <entry><constant>V4L2_SCENE_MODE_LANDSCAPE</constant> </entry> 3595 <entry>Landscape. The camera may choose a small aperture to 3596 provide deep depth of field and long exposure duration to help capture detail 3597 in dim light conditions. The focus is fixed at infinity. Suitable for distant 3598 and wide scenery.</entry> 3599 </row> 3600 <row> 3601 <entry><constant>V4L2_SCENE_MODE_NIGHT</constant> </entry> 3602 <entry>Night, also known as Night Landscape. Designed for low 3603 light conditions, it preserves detail in the dark areas without blowing out bright 3604 objects. The camera generally sets itself to a medium-to-high ISO sensitivity, 3605 with a relatively long exposure time, and turns flash off. As such, there will be 3606 increased image noise and the possibility of blurred image.</entry> 3607 </row> 3608 <row> 3609 <entry><constant>V4L2_SCENE_MODE_PARTY_INDOOR</constant> </entry> 3610 <entry>Party and indoor. Designed to capture indoor scenes 3611 that are lit by indoor background lighting as well as the flash. The camera 3612 usually increases ISO sensitivity, and adjusts exposure for the low light 3613 conditions.</entry> 3614 </row> 3615 <row> 3616 <entry><constant>V4L2_SCENE_MODE_PORTRAIT</constant> </entry> 3617 <entry>Portrait. The camera adjusts the aperture so that the 3618 depth of field is reduced, which helps to isolate the subject against a smooth 3619 background. Most cameras recognize the presence of faces in the scene and focus 3620 on them. The color hue is adjusted to enhance skin tones. The intensity of the 3621 flash is often reduced.</entry> 3622 </row> 3623 <row> 3624 <entry><constant>V4L2_SCENE_MODE_SPORTS</constant> </entry> 3625 <entry>Sports. Significantly increases ISO and uses a fast 3626 shutter speed to freeze motion of rapidly-moving subjects. Increased image 3627 noise may be seen in this mode.</entry> 3628 </row> 3629 <row> 3630 <entry><constant>V4L2_SCENE_MODE_SUNSET</constant> </entry> 3631 <entry>Sunset. Preserves deep hues seen in sunsets and 3632 sunrises. It bumps up the saturation.</entry> 3633 </row> 3634 <row> 3635 <entry><constant>V4L2_SCENE_MODE_TEXT</constant> </entry> 3636 <entry>Text. It applies extra contrast and sharpness, it is 3637 typically a black-and-white mode optimized for readability. Automatic focus 3638 may be switched to close-up mode and this setting may also involve some 3639 lens-distortion correction.</entry> 3640 </row> 3641 </tbody> 3642 </entrytbl> 3643 </row> 3644 <row><entry></entry></row> 3645 3646 <row> 3647 <entry spanname="id"><constant>V4L2_CID_3A_LOCK</constant></entry> 3648 <entry>bitmask</entry> 3649 </row> 3650 <row> 3651 <entry spanname="descr">This control locks or unlocks the automatic 3652 focus, exposure and white balance. The automatic adjustments can be paused 3653 independently by setting the corresponding lock bit to 1. The camera then retains 3654 the settings until the lock bit is cleared. The following lock bits are defined: 3655 </entry> 3656 </row> 3657 <row> 3658 <entrytbl spanname="descr" cols="2"> 3659 <tbody valign="top"> 3660 <row> 3661 <entry><constant>V4L2_LOCK_EXPOSURE</constant></entry> 3662 <entry>Automatic exposure adjustments lock.</entry> 3663 </row> 3664 <row> 3665 <entry><constant>V4L2_LOCK_WHITE_BALANCE</constant></entry> 3666 <entry>Automatic white balance adjustments lock.</entry> 3667 </row> 3668 <row> 3669 <entry><constant>V4L2_LOCK_FOCUS</constant></entry> 3670 <entry>Automatic focus lock.</entry> 3671 </row> 3672 </tbody> 3673 </entrytbl> 3674 </row> 3675 <row><entry spanname="descr"> 3676 When a given algorithm is not enabled, drivers should ignore requests 3677 to lock it and should return no error. An example might be an application 3678 setting bit <constant>V4L2_LOCK_WHITE_BALANCE</constant> when the 3679 <constant>V4L2_CID_AUTO_WHITE_BALANCE</constant> control is set to 3680 <constant>FALSE</constant>. The value of this control may be changed 3681 by exposure, white balance or focus controls.</entry> 3682 </row> 3683 <row><entry></entry></row> 3684 3685 </tbody> 3686 </tgroup> 3687 </table> 3688 </section> 3689 3690 <section id="fm-tx-controls"> 3691 <title>FM Transmitter Control Reference</title> 3692 3693 <para>The FM Transmitter (FM_TX) class includes controls for common features of 3694 FM transmissions capable devices. Currently this class includes parameters for audio 3695 compression, pilot tone generation, audio deviation limiter, RDS transmission and 3696 tuning power features.</para> 3697 3698 <table pgwide="1" frame="none" id="fm-tx-control-id"> 3699 <title>FM_TX Control IDs</title> 3700 3701 <tgroup cols="4"> 3702 <colspec colname="c1" colwidth="1*" /> 3703 <colspec colname="c2" colwidth="6*" /> 3704 <colspec colname="c3" colwidth="2*" /> 3705 <colspec colname="c4" colwidth="6*" /> 3706 <spanspec namest="c1" nameend="c2" spanname="id" /> 3707 <spanspec namest="c2" nameend="c4" spanname="descr" /> 3708 <thead> 3709 <row> 3710 <entry spanname="id" align="left">ID</entry> 3711 <entry align="left">Type</entry> 3712 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 3713 </row> 3714 </thead> 3715 <tbody valign="top"> 3716 <row><entry></entry></row> 3717 <row> 3718 <entry spanname="id"><constant>V4L2_CID_FM_TX_CLASS</constant> </entry> 3719 <entry>class</entry> 3720 </row><row><entry spanname="descr">The FM_TX class 3721 descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a 3722 description of this control class.</entry> 3723 </row> 3724 <row> 3725 <entry spanname="id"><constant>V4L2_CID_RDS_TX_DEVIATION</constant> </entry> 3726 <entry>integer</entry> 3727 </row> 3728 <row><entry spanname="descr">Configures RDS signal frequency deviation level in Hz. 3729 The range and step are driver-specific.</entry> 3730 </row> 3731 <row> 3732 <entry spanname="id"><constant>V4L2_CID_RDS_TX_PI</constant> </entry> 3733 <entry>integer</entry> 3734 </row> 3735 <row><entry spanname="descr">Sets the RDS Programme Identification field 3736 for transmission.</entry> 3737 </row> 3738 <row> 3739 <entry spanname="id"><constant>V4L2_CID_RDS_TX_PTY</constant> </entry> 3740 <entry>integer</entry> 3741 </row> 3742 <row><entry spanname="descr">Sets the RDS Programme Type field for transmission. 3743 This encodes up to 31 pre-defined programme types.</entry> 3744 </row> 3745 <row> 3746 <entry spanname="id"><constant>V4L2_CID_RDS_TX_PS_NAME</constant> </entry> 3747 <entry>string</entry> 3748 </row> 3749 <row><entry spanname="descr">Sets the Programme Service name (PS_NAME) for transmission. 3750 It is intended for static display on a receiver. It is the primary aid to listeners in programme service 3751 identification and selection. In Annex E of <xref linkend="iec62106" />, the RDS specification, 3752 there is a full description of the correct character encoding for Programme Service name strings. 3753 Also from RDS specification, PS is usually a single eight character text. However, it is also possible 3754 to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured 3755 with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry> 3756 </row> 3757 <row> 3758 <entry spanname="id"><constant>V4L2_CID_RDS_TX_RADIO_TEXT</constant> </entry> 3759 <entry>string</entry> 3760 </row> 3761 <row><entry spanname="descr">Sets the Radio Text info for transmission. It is a textual description of 3762 what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names, 3763 programme-related information or any other text. In these cases, RadioText should be used in addition to 3764 <constant>V4L2_CID_RDS_TX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described 3765 in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being 3766 used to transmit it, either 32 (2A block) or 64 (2B block). However, it is also possible 3767 to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured 3768 with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry> 3769 </row> 3770 <row> 3771 <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_ENABLED</constant> </entry> 3772 <entry>boolean</entry> 3773 </row> 3774 <row><entry spanname="descr">Enables or disables the audio deviation limiter feature. 3775 The limiter is useful when trying to maximize the audio volume, minimize receiver-generated 3776 distortion and prevent overmodulation. 3777 </entry> 3778 </row> 3779 <row> 3780 <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_RELEASE_TIME</constant> </entry> 3781 <entry>integer</entry> 3782 </row> 3783 <row><entry spanname="descr">Sets the audio deviation limiter feature release time. 3784 Unit is in useconds. Step and range are driver-specific.</entry> 3785 </row> 3786 <row> 3787 <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_DEVIATION</constant> </entry> 3788 <entry>integer</entry> 3789 </row> 3790 <row><entry spanname="descr">Configures audio frequency deviation level in Hz. 3791 The range and step are driver-specific.</entry> 3792 </row> 3793 <row> 3794 <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ENABLED</constant> </entry> 3795 <entry>boolean</entry> 3796 </row> 3797 <row><entry spanname="descr">Enables or disables the audio compression feature. 3798 This feature amplifies signals below the threshold by a fixed gain and compresses audio 3799 signals above the threshold by the ratio of Threshold/(Gain + Threshold).</entry> 3800 </row> 3801 <row> 3802 <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_GAIN</constant> </entry> 3803 <entry>integer</entry> 3804 </row> 3805 <row><entry spanname="descr">Sets the gain for audio compression feature. It is 3806 a dB value. The range and step are driver-specific.</entry> 3807 </row> 3808 <row> 3809 <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_THRESHOLD</constant> </entry> 3810 <entry>integer</entry> 3811 </row> 3812 <row><entry spanname="descr">Sets the threshold level for audio compression freature. 3813 It is a dB value. The range and step are driver-specific.</entry> 3814 </row> 3815 <row> 3816 <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME</constant> </entry> 3817 <entry>integer</entry> 3818 </row> 3819 <row><entry spanname="descr">Sets the attack time for audio compression feature. 3820 It is a useconds value. The range and step are driver-specific.</entry> 3821 </row> 3822 <row> 3823 <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME</constant> </entry> 3824 <entry>integer</entry> 3825 </row> 3826 <row><entry spanname="descr">Sets the release time for audio compression feature. 3827 It is a useconds value. The range and step are driver-specific.</entry> 3828 </row> 3829 <row> 3830 <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_ENABLED</constant> </entry> 3831 <entry>boolean</entry> 3832 </row> 3833 <row><entry spanname="descr">Enables or disables the pilot tone generation feature.</entry> 3834 </row> 3835 <row> 3836 <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_DEVIATION</constant> </entry> 3837 <entry>integer</entry> 3838 </row> 3839 <row><entry spanname="descr">Configures pilot tone frequency deviation level. Unit is 3840 in Hz. The range and step are driver-specific.</entry> 3841 </row> 3842 <row> 3843 <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_FREQUENCY</constant> </entry> 3844 <entry>integer</entry> 3845 </row> 3846 <row><entry spanname="descr">Configures pilot tone frequency value. Unit is 3847 in Hz. The range and step are driver-specific.</entry> 3848 </row> 3849 <row> 3850 <entry spanname="id"><constant>V4L2_CID_TUNE_PREEMPHASIS</constant> </entry> 3851 <entry>integer</entry> 3852 </row> 3853 <row id="v4l2-preemphasis"><entry spanname="descr">Configures the pre-emphasis value for broadcasting. 3854 A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies. 3855 Depending on the region, a time constant of either 50 or 75 useconds is used. The enum v4l2_preemphasis 3856 defines possible values for pre-emphasis. Here they are:</entry> 3857 </row><row> 3858 <entrytbl spanname="descr" cols="2"> 3859 <tbody valign="top"> 3860 <row> 3861 <entry><constant>V4L2_PREEMPHASIS_DISABLED</constant> </entry> 3862 <entry>No pre-emphasis is applied.</entry> 3863 </row> 3864 <row> 3865 <entry><constant>V4L2_PREEMPHASIS_50_uS</constant> </entry> 3866 <entry>A pre-emphasis of 50 uS is used.</entry> 3867 </row> 3868 <row> 3869 <entry><constant>V4L2_PREEMPHASIS_75_uS</constant> </entry> 3870 <entry>A pre-emphasis of 75 uS is used.</entry> 3871 </row> 3872 </tbody> 3873 </entrytbl> 3874 3875 </row> 3876 <row> 3877 <entry spanname="id"><constant>V4L2_CID_TUNE_POWER_LEVEL</constant> </entry> 3878 <entry>integer</entry> 3879 </row> 3880 <row><entry spanname="descr">Sets the output power level for signal transmission. 3881 Unit is in dBuV. Range and step are driver-specific.</entry> 3882 </row> 3883 <row> 3884 <entry spanname="id"><constant>V4L2_CID_TUNE_ANTENNA_CAPACITOR</constant> </entry> 3885 <entry>integer</entry> 3886 </row> 3887 <row><entry spanname="descr">This selects the value of antenna tuning capacitor 3888 manually or automatically if set to zero. Unit, range and step are driver-specific.</entry> 3889 </row> 3890 <row><entry></entry></row> 3891 </tbody> 3892 </tgroup> 3893 </table> 3894 3895 <para>For more details about RDS specification, refer to 3896 <xref linkend="iec62106" /> document, from CENELEC.</para> 3897 </section> 3898 3899 <section id="flash-controls"> 3900 <title>Flash Control Reference</title> 3901 3902 <note> 3903 <title>Experimental</title> 3904 3905 <para>This is an <link linkend="experimental">experimental</link> 3906 interface and may change in the future.</para> 3907 </note> 3908 3909 <para> 3910 The V4L2 flash controls are intended to provide generic access 3911 to flash controller devices. Flash controller devices are 3912 typically used in digital cameras. 3913 </para> 3914 3915 <para> 3916 The interface can support both LED and xenon flash devices. As 3917 of writing this, there is no xenon flash driver using this 3918 interface. 3919 </para> 3920 3921 <section id="flash-controls-use-cases"> 3922 <title>Supported use cases</title> 3923 3924 <section> 3925 <title>Unsynchronised LED flash (software strobe)</title> 3926 3927 <para> 3928 Unsynchronised LED flash is controlled directly by the 3929 host as the sensor. The flash must be enabled by the host 3930 before the exposure of the image starts and disabled once 3931 it ends. The host is fully responsible for the timing of 3932 the flash. 3933 </para> 3934 3935 <para>Example of such device: Nokia N900.</para> 3936 </section> 3937 3938 <section> 3939 <title>Synchronised LED flash (hardware strobe)</title> 3940 3941 <para> 3942 The synchronised LED flash is pre-programmed by the host 3943 (power and timeout) but controlled by the sensor through a 3944 strobe signal from the sensor to the flash. 3945 </para> 3946 3947 <para> 3948 The sensor controls the flash duration and timing. This 3949 information typically must be made available to the 3950 sensor. 3951 </para> 3952 3953 </section> 3954 3955 <section> 3956 <title>LED flash as torch</title> 3957 3958 <para> 3959 LED flash may be used as torch in conjunction with another 3960 use case involving camera or individually. 3961 </para> 3962 3963 3964 <table pgwide="1" frame="none" id="flash-control-id"> 3965 <title>Flash Control IDs</title> 3966 3967 <tgroup cols="4"> 3968 <colspec colname="c1" colwidth="1*" /> 3969 <colspec colname="c2" colwidth="6*" /> 3970 <colspec colname="c3" colwidth="2*" /> 3971 <colspec colname="c4" colwidth="6*" /> 3972 <spanspec namest="c1" nameend="c2" spanname="id" /> 3973 <spanspec namest="c2" nameend="c4" spanname="descr" /> 3974 <thead> 3975 <row> 3976 <entry spanname="id" align="left">ID</entry> 3977 <entry align="left">Type</entry> 3978 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 3979 </row> 3980 </thead> 3981 <tbody valign="top"> 3982 <row><entry></entry></row> 3983 <row> 3984 <entry spanname="id"><constant>V4L2_CID_FLASH_CLASS</constant></entry> 3985 <entry>class</entry> 3986 </row> 3987 <row> 3988 <entry spanname="descr">The FLASH class descriptor.</entry> 3989 </row> 3990 <row> 3991 <entry spanname="id"><constant>V4L2_CID_FLASH_LED_MODE</constant></entry> 3992 <entry>menu</entry> 3993 </row> 3994 <row id="v4l2-flash-led-mode"> 3995 <entry spanname="descr">Defines the mode of the flash LED, 3996 the high-power white LED attached to the flash controller. 3997 Setting this control may not be possible in presence of 3998 some faults. See V4L2_CID_FLASH_FAULT.</entry> 3999 </row> 4000 <row> 4001 <entrytbl spanname="descr" cols="2"> 4002 <tbody valign="top"> 4003 <row> 4004 <entry><constant>V4L2_FLASH_LED_MODE_NONE</constant></entry> 4005 <entry>Off.</entry> 4006 </row> 4007 <row> 4008 <entry><constant>V4L2_FLASH_LED_MODE_FLASH</constant></entry> 4009 <entry>Flash mode.</entry> 4010 </row> 4011 <row> 4012 <entry><constant>V4L2_FLASH_LED_MODE_TORCH</constant></entry> 4013 <entry>Torch mode. See V4L2_CID_FLASH_TORCH_INTENSITY.</entry> 4014 </row> 4015 </tbody> 4016 </entrytbl> 4017 </row> 4018 <row> 4019 <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_SOURCE</constant></entry> 4020 <entry>menu</entry> 4021 </row> 4022 <row id="v4l2-flash-strobe-source"><entry 4023 spanname="descr">Defines the source of the flash LED 4024 strobe.</entry> 4025 </row> 4026 <row> 4027 <entrytbl spanname="descr" cols="2"> 4028 <tbody valign="top"> 4029 <row> 4030 <entry><constant>V4L2_FLASH_STROBE_SOURCE_SOFTWARE</constant></entry> 4031 <entry>The flash strobe is triggered by using 4032 the V4L2_CID_FLASH_STROBE control.</entry> 4033 </row> 4034 <row> 4035 <entry><constant>V4L2_FLASH_STROBE_SOURCE_EXTERNAL</constant></entry> 4036 <entry>The flash strobe is triggered by an 4037 external source. Typically this is a sensor, 4038 which makes it possible to synchronises the 4039 flash strobe start to exposure start.</entry> 4040 </row> 4041 </tbody> 4042 </entrytbl> 4043 </row> 4044 <row> 4045 <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE</constant></entry> 4046 <entry>button</entry> 4047 </row> 4048 <row> 4049 <entry spanname="descr">Strobe flash. Valid when 4050 V4L2_CID_FLASH_LED_MODE is set to 4051 V4L2_FLASH_LED_MODE_FLASH and V4L2_CID_FLASH_STROBE_SOURCE 4052 is set to V4L2_FLASH_STROBE_SOURCE_SOFTWARE. Setting this 4053 control may not be possible in presence of some faults. 4054 See V4L2_CID_FLASH_FAULT.</entry> 4055 </row> 4056 <row> 4057 <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STOP</constant></entry> 4058 <entry>button</entry> 4059 </row> 4060 <row><entry spanname="descr">Stop flash strobe immediately.</entry> 4061 </row> 4062 <row> 4063 <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STATUS</constant></entry> 4064 <entry>boolean</entry> 4065 </row> 4066 <row> 4067 <entry spanname="descr">Strobe status: whether the flash 4068 is strobing at the moment or not. This is a read-only 4069 control.</entry> 4070 </row> 4071 <row> 4072 <entry spanname="id"><constant>V4L2_CID_FLASH_TIMEOUT</constant></entry> 4073 <entry>integer</entry> 4074 </row> 4075 <row> 4076 <entry spanname="descr">Hardware timeout for flash. The 4077 flash strobe is stopped after this period of time has 4078 passed from the start of the strobe.</entry> 4079 </row> 4080 <row> 4081 <entry spanname="id"><constant>V4L2_CID_FLASH_INTENSITY</constant></entry> 4082 <entry>integer</entry> 4083 </row> 4084 <row> 4085 <entry spanname="descr">Intensity of the flash strobe when 4086 the flash LED is in flash mode 4087 (V4L2_FLASH_LED_MODE_FLASH). The unit should be milliamps 4088 (mA) if possible.</entry> 4089 </row> 4090 <row> 4091 <entry spanname="id"><constant>V4L2_CID_FLASH_TORCH_INTENSITY</constant></entry> 4092 <entry>integer</entry> 4093 </row> 4094 <row> 4095 <entry spanname="descr">Intensity of the flash LED in 4096 torch mode (V4L2_FLASH_LED_MODE_TORCH). The unit should be 4097 milliamps (mA) if possible. Setting this control may not 4098 be possible in presence of some faults. See 4099 V4L2_CID_FLASH_FAULT.</entry> 4100 </row> 4101 <row> 4102 <entry spanname="id"><constant>V4L2_CID_FLASH_INDICATOR_INTENSITY</constant></entry> 4103 <entry>integer</entry> 4104 </row> 4105 <row> 4106 <entry spanname="descr">Intensity of the indicator LED. 4107 The indicator LED may be fully independent of the flash 4108 LED. The unit should be microamps (uA) if possible.</entry> 4109 </row> 4110 <row> 4111 <entry spanname="id"><constant>V4L2_CID_FLASH_FAULT</constant></entry> 4112 <entry>bitmask</entry> 4113 </row> 4114 <row> 4115 <entry spanname="descr">Faults related to the flash. The 4116 faults tell about specific problems in the flash chip 4117 itself or the LEDs attached to it. Faults may prevent 4118 further use of some of the flash controls. In particular, 4119 V4L2_CID_FLASH_LED_MODE is set to V4L2_FLASH_LED_MODE_NONE 4120 if the fault affects the flash LED. Exactly which faults 4121 have such an effect is chip dependent. Reading the faults 4122 resets the control and returns the chip to a usable state 4123 if possible.</entry> 4124 </row> 4125 <row> 4126 <entrytbl spanname="descr" cols="2"> 4127 <tbody valign="top"> 4128 <row> 4129 <entry><constant>V4L2_FLASH_FAULT_OVER_VOLTAGE</constant></entry> 4130 <entry>Flash controller voltage to the flash LED 4131 has exceeded the limit specific to the flash 4132 controller.</entry> 4133 </row> 4134 <row> 4135 <entry><constant>V4L2_FLASH_FAULT_TIMEOUT</constant></entry> 4136 <entry>The flash strobe was still on when 4137 the timeout set by the user --- 4138 V4L2_CID_FLASH_TIMEOUT control --- has expired. 4139 Not all flash controllers may set this in all 4140 such conditions.</entry> 4141 </row> 4142 <row> 4143 <entry><constant>V4L2_FLASH_FAULT_OVER_TEMPERATURE</constant></entry> 4144 <entry>The flash controller has overheated.</entry> 4145 </row> 4146 <row> 4147 <entry><constant>V4L2_FLASH_FAULT_SHORT_CIRCUIT</constant></entry> 4148 <entry>The short circuit protection of the flash 4149 controller has been triggered.</entry> 4150 </row> 4151 <row> 4152 <entry><constant>V4L2_FLASH_FAULT_OVER_CURRENT</constant></entry> 4153 <entry>Current in the LED power supply has exceeded the limit 4154 specific to the flash controller.</entry> 4155 </row> 4156 <row> 4157 <entry><constant>V4L2_FLASH_FAULT_INDICATOR</constant></entry> 4158 <entry>The flash controller has detected a short or open 4159 circuit condition on the indicator LED.</entry> 4160 </row> 4161 </tbody> 4162 </entrytbl> 4163 </row> 4164 <row> 4165 <entry spanname="id"><constant>V4L2_CID_FLASH_CHARGE</constant></entry> 4166 <entry>boolean</entry> 4167 </row> 4168 <row><entry spanname="descr">Enable or disable charging of the xenon 4169 flash capacitor.</entry> 4170 </row> 4171 <row> 4172 <entry spanname="id"><constant>V4L2_CID_FLASH_READY</constant></entry> 4173 <entry>boolean</entry> 4174 </row> 4175 <row> 4176 <entry spanname="descr">Is the flash ready to strobe? 4177 Xenon flashes require their capacitors charged before 4178 strobing. LED flashes often require a cooldown period 4179 after strobe during which another strobe will not be 4180 possible. This is a read-only control.</entry> 4181 </row> 4182 <row><entry></entry></row> 4183 </tbody> 4184 </tgroup> 4185 </table> 4186 </section> 4187 </section> 4188 </section> 4189 4190 <section id="jpeg-controls"> 4191 <title>JPEG Control Reference</title> 4192 <para>The JPEG class includes controls for common features of JPEG 4193 encoders and decoders. Currently it includes features for codecs 4194 implementing progressive baseline DCT compression process with 4195 Huffman entrophy coding.</para> 4196 <table pgwide="1" frame="none" id="jpeg-control-id"> 4197 <title>JPEG Control IDs</title> 4198 4199 <tgroup cols="4"> 4200 <colspec colname="c1" colwidth="1*" /> 4201 <colspec colname="c2" colwidth="6*" /> 4202 <colspec colname="c3" colwidth="2*" /> 4203 <colspec colname="c4" colwidth="6*" /> 4204 <spanspec namest="c1" nameend="c2" spanname="id" /> 4205 <spanspec namest="c2" nameend="c4" spanname="descr" /> 4206 <thead> 4207 <row> 4208 <entry spanname="id" align="left">ID</entry> 4209 <entry align="left">Type</entry> 4210 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 4211 </row> 4212 </thead> 4213 <tbody valign="top"> 4214 <row><entry></entry></row> 4215 <row> 4216 <entry spanname="id"><constant>V4L2_CID_JPEG_CLASS</constant> </entry> 4217 <entry>class</entry> 4218 </row><row><entry spanname="descr">The JPEG class descriptor. Calling 4219 &VIDIOC-QUERYCTRL; for this control will return a description of this 4220 control class. 4221 4222 </entry> 4223 </row> 4224 <row> 4225 <entry spanname="id"><constant>V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant></entry> 4226 <entry>menu</entry> 4227 </row> 4228 <row id="v4l2-jpeg-chroma-subsampling"> 4229 <entry spanname="descr">The chroma subsampling factors describe how 4230 each component of an input image is sampled, in respect to maximum 4231 sample rate in each spatial dimension. See <xref linkend="itu-t81"/>, 4232 clause A.1.1. for more details. The <constant> 4233 V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant> control determines how 4234 Cb and Cr components are downsampled after coverting an input image 4235 from RGB to Y'CbCr color space. 4236 </entry> 4237 </row> 4238 <row> 4239 <entrytbl spanname="descr" cols="2"> 4240 <tbody valign="top"> 4241 <row> 4242 <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_444</constant> 4243 </entry><entry>No chroma subsampling, each pixel has 4244 Y, Cr and Cb values.</entry> 4245 </row> 4246 <row> 4247 <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_422</constant> 4248 </entry><entry>Horizontally subsample Cr, Cb components 4249 by a factor of 2.</entry> 4250 </row> 4251 <row> 4252 <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_420</constant> 4253 </entry><entry>Subsample Cr, Cb components horizontally 4254 and vertically by 2.</entry> 4255 </row> 4256 <row> 4257 <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_411</constant> 4258 </entry><entry>Horizontally subsample Cr, Cb components 4259 by a factor of 4.</entry> 4260 </row> 4261 <row> 4262 <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_410</constant> 4263 </entry><entry>Subsample Cr, Cb components horizontally 4264 by 4 and vertically by 2.</entry> 4265 </row> 4266 <row> 4267 <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY</constant> 4268 </entry><entry>Use only luminance component.</entry> 4269 </row> 4270 </tbody> 4271 </entrytbl> 4272 </row> 4273 <row> 4274 <entry spanname="id"><constant>V4L2_CID_JPEG_RESTART_INTERVAL</constant> 4275 </entry><entry>integer</entry> 4276 </row> 4277 <row><entry spanname="descr"> 4278 The restart interval determines an interval of inserting RSTm 4279 markers (m = 0..7). The purpose of these markers is to additionally 4280 reinitialize the encoder process, in order to process blocks of 4281 an image independently. 4282 For the lossy compression processes the restart interval unit is 4283 MCU (Minimum Coded Unit) and its value is contained in DRI 4284 (Define Restart Interval) marker. If <constant> 4285 V4L2_CID_JPEG_RESTART_INTERVAL</constant> control is set to 0, 4286 DRI and RSTm markers will not be inserted. 4287 </entry> 4288 </row> 4289 <row id="jpeg-quality-control"> 4290 <entry spanname="id"><constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant></entry> 4291 <entry>integer</entry> 4292 </row> 4293 <row> 4294 <entry spanname="descr"> 4295 <constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control 4296 determines trade-off between image quality and size. 4297 It provides simpler method for applications to control image quality, 4298 without a need for direct reconfiguration of luminance and chrominance 4299 quantization tables. 4300 4301 In cases where a driver uses quantization tables configured directly 4302 by an application, using interfaces defined elsewhere, <constant> 4303 V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control should be set 4304 by driver to 0. 4305 4306 <para>The value range of this control is driver-specific. Only 4307 positive, non-zero values are meaningful. The recommended range 4308 is 1 - 100, where larger values correspond to better image quality. 4309 </para> 4310 </entry> 4311 </row> 4312 <row id="jpeg-active-marker-control"> 4313 <entry spanname="id"><constant>V4L2_CID_JPEG_ACTIVE_MARKER</constant></entry> 4314 <entry>bitmask</entry> 4315 </row> 4316 <row> 4317 <entry spanname="descr">Specify which JPEG markers are included 4318 in compressed stream. This control is valid only for encoders. 4319 </entry> 4320 </row> 4321 <row> 4322 <entrytbl spanname="descr" cols="2"> 4323 <tbody valign="top"> 4324 <row> 4325 <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP0</constant></entry> 4326 <entry>Application data segment APP<subscript>0</subscript>.</entry> 4327 </row><row> 4328 <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP1</constant></entry> 4329 <entry>Application data segment APP<subscript>1</subscript>.</entry> 4330 </row><row> 4331 <entry><constant>V4L2_JPEG_ACTIVE_MARKER_COM</constant></entry> 4332 <entry>Comment segment.</entry> 4333 </row><row> 4334 <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DQT</constant></entry> 4335 <entry>Quantization tables segment.</entry> 4336 </row><row> 4337 <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DHT</constant></entry> 4338 <entry>Huffman tables segment.</entry> 4339 </row> 4340 </tbody> 4341 </entrytbl> 4342 </row> 4343 <row><entry></entry></row> 4344 </tbody> 4345 </tgroup> 4346 </table> 4347 <para>For more details about JPEG specification, refer 4348 to <xref linkend="itu-t81"/>, <xref linkend="jfif"/>, 4349 <xref linkend="w3c-jpeg-jfif"/>.</para> 4350 </section> 4351 4352 <section id="image-source-controls"> 4353 <title>Image Source Control Reference</title> 4354 4355 <note> 4356 <title>Experimental</title> 4357 4358 <para>This is an <link 4359 linkend="experimental">experimental</link> interface and may 4360 change in the future.</para> 4361 </note> 4362 4363 <para> 4364 The Image Source control class is intended for low-level 4365 control of image source devices such as image sensors. The 4366 devices feature an analogue to digital converter and a bus 4367 transmitter to transmit the image data out of the device. 4368 </para> 4369 4370 <table pgwide="1" frame="none" id="image-source-control-id"> 4371 <title>Image Source Control IDs</title> 4372 4373 <tgroup cols="4"> 4374 <colspec colname="c1" colwidth="1*" /> 4375 <colspec colname="c2" colwidth="6*" /> 4376 <colspec colname="c3" colwidth="2*" /> 4377 <colspec colname="c4" colwidth="6*" /> 4378 <spanspec namest="c1" nameend="c2" spanname="id" /> 4379 <spanspec namest="c2" nameend="c4" spanname="descr" /> 4380 <thead> 4381 <row> 4382 <entry spanname="id" align="left">ID</entry> 4383 <entry align="left">Type</entry> 4384 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 4385 </row> 4386 </thead> 4387 <tbody valign="top"> 4388 <row><entry></entry></row> 4389 <row> 4390 <entry spanname="id"><constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant></entry> 4391 <entry>class</entry> 4392 </row> 4393 <row> 4394 <entry spanname="descr">The IMAGE_SOURCE class descriptor.</entry> 4395 </row> 4396 <row> 4397 <entry spanname="id"><constant>V4L2_CID_VBLANK</constant></entry> 4398 <entry>integer</entry> 4399 </row> 4400 <row> 4401 <entry spanname="descr">Vertical blanking. The idle period 4402 after every frame during which no image data is produced. 4403 The unit of vertical blanking is a line. Every line has 4404 length of the image width plus horizontal blanking at the 4405 pixel rate defined by 4406 <constant>V4L2_CID_PIXEL_RATE</constant> control in the 4407 same sub-device.</entry> 4408 </row> 4409 <row> 4410 <entry spanname="id"><constant>V4L2_CID_HBLANK</constant></entry> 4411 <entry>integer</entry> 4412 </row> 4413 <row> 4414 <entry spanname="descr">Horizontal blanking. The idle 4415 period after every line of image data during which no 4416 image data is produced. The unit of horizontal blanking is 4417 pixels.</entry> 4418 </row> 4419 <row> 4420 <entry spanname="id"><constant>V4L2_CID_ANALOGUE_GAIN</constant></entry> 4421 <entry>integer</entry> 4422 </row> 4423 <row> 4424 <entry spanname="descr">Analogue gain is gain affecting 4425 all colour components in the pixel matrix. The gain 4426 operation is performed in the analogue domain before A/D 4427 conversion. 4428 </entry> 4429 </row> 4430 <row><entry></entry></row> 4431 </tbody> 4432 </tgroup> 4433 </table> 4434 4435 </section> 4436 4437 <section id="image-process-controls"> 4438 <title>Image Process Control Reference</title> 4439 4440 <note> 4441 <title>Experimental</title> 4442 4443 <para>This is an <link 4444 linkend="experimental">experimental</link> interface and may 4445 change in the future.</para> 4446 </note> 4447 4448 <para> 4449 The Image Source control class is intended for low-level control of 4450 image processing functions. Unlike 4451 <constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant>, the controls in 4452 this class affect processing the image, and do not control capturing 4453 of it. 4454 </para> 4455 4456 <table pgwide="1" frame="none" id="image-process-control-id"> 4457 <title>Image Source Control IDs</title> 4458 4459 <tgroup cols="4"> 4460 <colspec colname="c1" colwidth="1*" /> 4461 <colspec colname="c2" colwidth="6*" /> 4462 <colspec colname="c3" colwidth="2*" /> 4463 <colspec colname="c4" colwidth="6*" /> 4464 <spanspec namest="c1" nameend="c2" spanname="id" /> 4465 <spanspec namest="c2" nameend="c4" spanname="descr" /> 4466 <thead> 4467 <row> 4468 <entry spanname="id" align="left">ID</entry> 4469 <entry align="left">Type</entry> 4470 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 4471 </row> 4472 </thead> 4473 <tbody valign="top"> 4474 <row><entry></entry></row> 4475 <row> 4476 <entry spanname="id"><constant>V4L2_CID_IMAGE_PROC_CLASS</constant></entry> 4477 <entry>class</entry> 4478 </row> 4479 <row> 4480 <entry spanname="descr">The IMAGE_PROC class descriptor.</entry> 4481 </row> 4482 <row> 4483 <entry spanname="id"><constant>V4L2_CID_LINK_FREQ</constant></entry> 4484 <entry>integer menu</entry> 4485 </row> 4486 <row> 4487 <entry spanname="descr">Data bus frequency. Together with the 4488 media bus pixel code, bus type (clock cycles per sample), the 4489 data bus frequency defines the pixel rate 4490 (<constant>V4L2_CID_PIXEL_RATE</constant>) in the 4491 pixel array (or possibly elsewhere, if the device is not an 4492 image sensor). The frame rate can be calculated from the pixel 4493 clock, image width and height and horizontal and vertical 4494 blanking. While the pixel rate control may be defined elsewhere 4495 than in the subdev containing the pixel array, the frame rate 4496 cannot be obtained from that information. This is because only 4497 on the pixel array it can be assumed that the vertical and 4498 horizontal blanking information is exact: no other blanking is 4499 allowed in the pixel array. The selection of frame rate is 4500 performed by selecting the desired horizontal and vertical 4501 blanking. The unit of this control is Hz. </entry> 4502 </row> 4503 <row> 4504 <entry spanname="id"><constant>V4L2_CID_PIXEL_RATE</constant></entry> 4505 <entry>64-bit integer</entry> 4506 </row> 4507 <row> 4508 <entry spanname="descr">Pixel rate in the source pads of 4509 the subdev. This control is read-only and its unit is 4510 pixels / second. 4511 </entry> 4512 </row> 4513 <row> 4514 <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN</constant></entry> 4515 <entry>menu</entry> 4516 </row> 4517 <row id="v4l2-test-pattern"> 4518 <entry spanname="descr"> Some capture/display/sensor devices have 4519 the capability to generate test pattern images. These hardware 4520 specific test patterns can be used to test if a device is working 4521 properly.</entry> 4522 </row> 4523 <row><entry></entry></row> 4524 </tbody> 4525 </tgroup> 4526 </table> 4527 4528 </section> 4529 4530 <section id="dv-controls"> 4531 <title>Digital Video Control Reference</title> 4532 4533 <note> 4534 <title>Experimental</title> 4535 4536 <para>This is an <link 4537 linkend="experimental">experimental</link> interface and may 4538 change in the future.</para> 4539 </note> 4540 4541 <para> 4542 The Digital Video control class is intended to control receivers 4543 and transmitters for <ulink url="http://en.wikipedia.org/wiki/Vga">VGA</ulink>, 4544 <ulink url="http://en.wikipedia.org/wiki/Digital_Visual_Interface">DVI</ulink> 4545 (Digital Visual Interface), HDMI (<xref linkend="hdmi" />) and DisplayPort (<xref linkend="dp" />). 4546 These controls are generally expected to be private to the receiver or transmitter 4547 subdevice that implements them, so they are only exposed on the 4548 <filename>/dev/v4l-subdev*</filename> device node. 4549 </para> 4550 4551 <para>Note that these devices can have multiple input or output pads which are 4552 hooked up to e.g. HDMI connectors. Even though the subdevice will receive or 4553 transmit video from/to only one of those pads, the other pads can still be 4554 active when it comes to EDID (Extended Display Identification Data, 4555 <xref linkend="vesaedid" />) and HDCP (High-bandwidth Digital Content 4556 Protection System, <xref linkend="hdcp" />) processing, allowing the device 4557 to do the fairly slow EDID/HDCP handling in advance. This allows for quick 4558 switching between connectors.</para> 4559 4560 <para>These pads appear in several of the controls in this section as 4561 bitmasks, one bit for each pad. Bit 0 corresponds to pad 0, bit 1 to pad 1, 4562 etc. The maximum value of the control is the set of valid pads.</para> 4563 4564 <table pgwide="1" frame="none" id="dv-control-id"> 4565 <title>Digital Video Control IDs</title> 4566 4567 <tgroup cols="4"> 4568 <colspec colname="c1" colwidth="1*" /> 4569 <colspec colname="c2" colwidth="6*" /> 4570 <colspec colname="c3" colwidth="2*" /> 4571 <colspec colname="c4" colwidth="6*" /> 4572 <spanspec namest="c1" nameend="c2" spanname="id" /> 4573 <spanspec namest="c2" nameend="c4" spanname="descr" /> 4574 <thead> 4575 <row> 4576 <entry spanname="id" align="left">ID</entry> 4577 <entry align="left">Type</entry> 4578 </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> 4579 </row> 4580 </thead> 4581 <tbody valign="top"> 4582 <row><entry></entry></row> 4583 <row> 4584 <entry spanname="id"><constant>V4L2_CID_DV_CLASS</constant></entry> 4585 <entry>class</entry> 4586 </row> 4587 <row> 4588 <entry spanname="descr">The Digital Video class descriptor.</entry> 4589 </row> 4590 <row> 4591 <entry spanname="id"><constant>V4L2_CID_DV_TX_HOTPLUG</constant></entry> 4592 <entry>bitmask</entry> 4593 </row> 4594 <row> 4595 <entry spanname="descr">Many connectors have a hotplug pin which is high 4596 if EDID information is available from the source. This control shows the 4597 state of the hotplug pin as seen by the transmitter. 4598 Each bit corresponds to an output pad on the transmitter. If an output pad 4599 does not have an associated hotplug pin, then the bit for that pad will be 0. 4600 This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors. 4601 </entry> 4602 </row> 4603 <row> 4604 <entry spanname="id"><constant>V4L2_CID_DV_TX_RXSENSE</constant></entry> 4605 <entry>bitmask</entry> 4606 </row> 4607 <row> 4608 <entry spanname="descr">Rx Sense is the detection of pull-ups on the TMDS 4609 clock lines. This normally means that the sink has left/entered standby (i.e. 4610 the transmitter can sense that the receiver is ready to receive video). 4611 Each bit corresponds to an output pad on the transmitter. If an output pad 4612 does not have an associated Rx Sense, then the bit for that pad will be 0. 4613 This read-only control is applicable to DVI-D and HDMI devices. 4614 </entry> 4615 </row> 4616 <row> 4617 <entry spanname="id"><constant>V4L2_CID_DV_TX_EDID_PRESENT</constant></entry> 4618 <entry>bitmask</entry> 4619 </row> 4620 <row> 4621 <entry spanname="descr">When the transmitter sees the hotplug signal from the 4622 receiver it will attempt to read the EDID. If set, then the transmitter has read 4623 at least the first block (= 128 bytes). 4624 Each bit corresponds to an output pad on the transmitter. If an output pad 4625 does not support EDIDs, then the bit for that pad will be 0. 4626 This read-only control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors. 4627 </entry> 4628 </row> 4629 <row> 4630 <entry spanname="id"><constant>V4L2_CID_DV_TX_MODE</constant></entry> 4631 <entry id="v4l2-dv-tx-mode">enum v4l2_dv_tx_mode</entry> 4632 </row> 4633 <row> 4634 <entry spanname="descr">HDMI transmitters can transmit in DVI-D mode (just video) 4635 or in HDMI mode (video + audio + auxiliary data). This control selects which mode 4636 to use: V4L2_DV_TX_MODE_DVI_D or V4L2_DV_TX_MODE_HDMI. 4637 This control is applicable to HDMI connectors. 4638 </entry> 4639 </row> 4640 <row> 4641 <entry spanname="id"><constant>V4L2_CID_DV_TX_RGB_RANGE</constant></entry> 4642 <entry id="v4l2-dv-rgb-range">enum v4l2_dv_rgb_range</entry> 4643 </row> 4644 <row> 4645 <entry spanname="descr">Select the quantization range for RGB output. V4L2_DV_RANGE_AUTO 4646 follows the RGB quantization range specified in the standard for the video interface 4647 (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard 4648 to be compatible with sinks that have not implemented the standard correctly 4649 (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be 4650 used whereas limited range sets the range to (16 << (N-8)) - (235 << (N-8)) 4651 where N is the number of bits per component. 4652 This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors. 4653 </entry> 4654 </row> 4655 <row> 4656 <entry spanname="id"><constant>V4L2_CID_DV_RX_POWER_PRESENT</constant></entry> 4657 <entry>bitmask</entry> 4658 </row> 4659 <row> 4660 <entry spanname="descr">Detects whether the receiver receives power from the source 4661 (e.g. HDMI carries 5V on one of the pins). This is often used to power an eeprom 4662 which contains EDID information, such that the source can read the EDID even if 4663 the sink is in standby/power off. 4664 Each bit corresponds to an input pad on the transmitter. If an input pad 4665 cannot detect whether power is present, then the bit for that pad will be 0. 4666 This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors. 4667 </entry> 4668 </row> 4669 <row> 4670 <entry spanname="id"><constant>V4L2_CID_DV_RX_RGB_RANGE</constant></entry> 4671 <entry>enum v4l2_dv_rgb_range</entry> 4672 </row> 4673 <row> 4674 <entry spanname="descr">Select the quantization range for RGB input. V4L2_DV_RANGE_AUTO 4675 follows the RGB quantization range specified in the standard for the video interface 4676 (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard 4677 to be compatible with sources that have not implemented the standard correctly 4678 (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be 4679 used whereas limited range sets the range to (16 << (N-8)) - (235 << (N-8)) 4680 where N is the number of bits per component. 4681 This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors. 4682 </entry> 4683 </row> 4684 <row><entry></entry></row> 4685 </tbody> 4686 </tgroup> 4687 </table> 4688 4689 </section> 4690 </section>
- [ v4l ]
- biblio.xml
- capture.c.xml
- common.xml
- compat.xml
- controls.xml
- crop.pdf
- dev-capture.xml
- dev-codec.xml
- dev-effect.xml
- dev-event.xml
- dev-osd.xml
- dev-output.xml
- dev-overlay.xml
- dev-radio.xml
- dev-raw-vbi.xml
- dev-rds.xml
- dev-sliced-vbi.xml
- dev-subdev.xml
- dev-teletext.xml
- driver.xml
- fdl-appendix.xml
- fieldseq_bt.pdf
- fieldseq_tb.pdf
- func-close.xml
- func-ioctl.xml
- func-mmap.xml
- func-munmap.xml
- func-open.xml
- func-poll.xml
- func-read.xml
- func-select.xml
- func-write.xml
- gen-errors.xml
- io.xml
- keytable.c.xml
- libv4l.xml
- lirc_device_interface.xml
- media-controller.xml
- media-func-close.xml
- media-func-ioctl.xml
- media-func-open.xml
- media-ioc-device-info.xml
- media-ioc-enum-entities.xml
- media-ioc-enum-links.xml
- media-ioc-setup-link.xml
- pipeline.pdf
- pixfmt-grey.xml
- pixfmt-m420.xml
- pixfmt-nv12.xml
- pixfmt-nv12m.xml
- pixfmt-nv12mt.xml
- pixfmt-nv16.xml
- pixfmt-nv24.xml
- pixfmt-packed-rgb.xml
- pixfmt-packed-yuv.xml
- pixfmt-sbggr16.xml
- pixfmt-sbggr8.xml
- pixfmt-sgbrg8.xml
- pixfmt-sgrbg8.xml
- pixfmt-srggb10.xml
- pixfmt-srggb10alaw8.xml
- pixfmt-srggb10dpcm8.xml
- pixfmt-srggb12.xml
- pixfmt-srggb8.xml
- pixfmt-uv8.xml
- pixfmt-uyvy.xml
- pixfmt-vyuy.xml
- pixfmt-y10.xml
- pixfmt-y10b.xml
- pixfmt-y12.xml
- pixfmt-y16.xml
- pixfmt-y41p.xml
- pixfmt-yuv410.xml
- pixfmt-yuv411p.xml
- pixfmt-yuv420.xml
- pixfmt-yuv420m.xml
- pixfmt-yuv422p.xml
- pixfmt-yuyv.xml
- pixfmt-yvu420m.xml
- pixfmt-yvyu.xml
- pixfmt.xml
- planar-apis.xml
- remote_controllers.xml
- selection-api.xml
- selections-common.xml
- subdev-formats.xml
- subdev-image-processing-crop.dia
- subdev-image-processing-crop.svg
- subdev-image-processing-full.dia
- subdev-image-processing-full.svg
- subdev-image-processing-scaling-multi-source.dia
- subdev-image-processing-scaling-multi-source.svg
- v4l2.xml
- v4l2grab.c.xml
- vbi_525.pdf
- vbi_625.pdf
- vbi_hsync.pdf
- vidioc-create-bufs.xml
- vidioc-cropcap.xml
- vidioc-dbg-g-chip-ident.xml
- vidioc-dbg-g-register.xml
- vidioc-decoder-cmd.xml
- vidioc-dqevent.xml
- vidioc-dv-timings-cap.xml
- vidioc-encoder-cmd.xml
- vidioc-enum-dv-presets.xml
- vidioc-enum-dv-timings.xml
- vidioc-enum-fmt.xml
- vidioc-enum-frameintervals.xml
- vidioc-enum-framesizes.xml
- vidioc-enum-freq-bands.xml
- vidioc-enumaudio.xml
- vidioc-enumaudioout.xml
- vidioc-enuminput.xml
- vidioc-enumoutput.xml
- vidioc-enumstd.xml
- vidioc-expbuf.xml
- vidioc-g-audio.xml
- vidioc-g-audioout.xml
- vidioc-g-crop.xml
- vidioc-g-ctrl.xml
- vidioc-g-dv-preset.xml
- vidioc-g-dv-timings.xml
- vidioc-g-enc-index.xml
- vidioc-g-ext-ctrls.xml
- vidioc-g-fbuf.xml
- vidioc-g-fmt.xml
- vidioc-g-frequency.xml
- vidioc-g-input.xml
- vidioc-g-jpegcomp.xml
- vidioc-g-modulator.xml
- vidioc-g-output.xml
- vidioc-g-parm.xml
- vidioc-g-priority.xml
- vidioc-g-selection.xml
- vidioc-g-sliced-vbi-cap.xml
- vidioc-g-std.xml
- vidioc-g-tuner.xml
- vidioc-log-status.xml
- vidioc-overlay.xml
- vidioc-prepare-buf.xml
- vidioc-qbuf.xml
- vidioc-query-dv-preset.xml
- vidioc-query-dv-timings.xml
- vidioc-querybuf.xml
- vidioc-querycap.xml
- vidioc-queryctrl.xml
- vidioc-querystd.xml
- vidioc-reqbufs.xml
- vidioc-s-hw-freq-seek.xml
- vidioc-streamon.xml
- vidioc-subdev-enum-frame-interval.xml
- vidioc-subdev-enum-frame-size.xml
- vidioc-subdev-enum-mbus-code.xml
- vidioc-subdev-g-crop.xml
- vidioc-subdev-g-edid.xml
- vidioc-subdev-g-fmt.xml
- vidioc-subdev-g-frame-interval.xml
- vidioc-subdev-g-selection.xml
- vidioc-subscribe-event.xml
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