About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / DocBook / media / v4l / controls.xml




Custom Search

Based on kernel version 4.7.2. Page generated on 2016-08-22 22:44 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	<footnote><para>The use of <constant>V4L2_CID_PRIVATE_BASE</constant>
17	is problematic because different drivers may use the same
18	<constant>V4L2_CID_PRIVATE_BASE</constant> ID for different controls.
19	This makes it hard to programatically set such controls since the meaning
20	of the control with that ID is driver dependent. In order to resolve this
21	drivers use unique IDs and the <constant>V4L2_CID_PRIVATE_BASE</constant>
22	IDs are mapped to those unique IDs by the kernel. Consider these
23	<constant>V4L2_CID_PRIVATE_BASE</constant> IDs as aliases to the real
24	IDs.</para>
25	<para>Many applications today still use the <constant>V4L2_CID_PRIVATE_BASE</constant>
26	IDs instead of using &VIDIOC-QUERYCTRL; with the <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>
27	flag to enumerate all IDs, so support for <constant>V4L2_CID_PRIVATE_BASE</constant>
28	is still around.</para></footnote>
29	and higher values. The pre-defined control IDs have the prefix
30	<constant>V4L2_CID_</constant>, and are listed in <xref
31	linkend="control-id" />. The ID is used when querying the attributes of
32	a control, and when getting or setting the current value.</para>
33	
34	    <para>Generally applications should present controls to the user
35	without assumptions about their purpose. Each control comes with a
36	name string the user is supposed to understand. When the purpose is
37	non-intuitive the driver writer should provide a user manual, a user
38	interface plug-in or a driver specific panel application. Predefined
39	IDs were introduced to change a few controls programmatically, for
40	example to mute a device during a channel switch.</para>
41	
42	    <para>Drivers may enumerate different controls after switching
43	the current video input or output, tuner or modulator, or audio input
44	or output. Different in the sense of other bounds, another default and
45	current value, step size or other menu items. A control with a certain
46	<emphasis>custom</emphasis> ID can also change name and
47	type.</para>
48	
49	    <para>If a control is not applicable to the current configuration
50	of the device (for example, it doesn't apply to the current video input)
51	drivers set the <constant>V4L2_CTRL_FLAG_INACTIVE</constant> flag.</para>
52	
53	    <para>Control values are stored globally, they do not
54	change when switching except to stay within the reported bounds. They
55	also do not change &eg; when the device is opened or closed, when the
56	tuner radio frequency is changed or generally never without
57	application request.</para>
58	
59	    <para>V4L2 specifies an event mechanism to notify applications
60	when controls change value (see &VIDIOC-SUBSCRIBE-EVENT;, event
61	<constant>V4L2_EVENT_CTRL</constant>), panel applications might want to make
62	use of that in order to always reflect the correct control value.</para>
63	
64	    <para>
65	      All controls use machine endianness.
66	    </para>
67	
68	    <table pgwide="1" frame="none" id="control-id">
69	      <title>Control IDs</title>
70	      <tgroup cols="3">
71		&cs-def;
72		<thead>
73		  <row>
74		    <entry>ID</entry>
75		    <entry>Type</entry>
76		    <entry>Description</entry>
77		  </row>
78		</thead>
79		<tbody valign="top">
80		  <row>
81		    <entry><constant>V4L2_CID_BASE</constant></entry>
82		    <entry></entry>
83		    <entry>First predefined ID, equal to
84	<constant>V4L2_CID_BRIGHTNESS</constant>.</entry>
85		  </row>
86		  <row>
87		    <entry><constant>V4L2_CID_USER_BASE</constant></entry>
88		    <entry></entry>
89		    <entry>Synonym of <constant>V4L2_CID_BASE</constant>.</entry>
90		  </row>
91		  <row>
92		    <entry><constant>V4L2_CID_BRIGHTNESS</constant></entry>
93		    <entry>integer</entry>
94		    <entry>Picture brightness, or more precisely, the black
95	level.</entry>
96		  </row>
97		  <row>
98		    <entry><constant>V4L2_CID_CONTRAST</constant></entry>
99		    <entry>integer</entry>
100		    <entry>Picture contrast or luma gain.</entry>
101		  </row>
102		  <row>
103		    <entry><constant>V4L2_CID_SATURATION</constant></entry>
104		    <entry>integer</entry>
105		    <entry>Picture color saturation or chroma gain.</entry>
106		  </row>
107		  <row>
108		    <entry><constant>V4L2_CID_HUE</constant></entry>
109		    <entry>integer</entry>
110		    <entry>Hue or color balance.</entry>
111		  </row>
112		  <row>
113		    <entry><constant>V4L2_CID_AUDIO_VOLUME</constant></entry>
114		    <entry>integer</entry>
115		    <entry>Overall audio volume. Note some drivers also
116	provide an OSS or ALSA mixer interface.</entry>
117		  </row>
118		  <row>
119		    <entry><constant>V4L2_CID_AUDIO_BALANCE</constant></entry>
120		    <entry>integer</entry>
121		    <entry>Audio stereo balance. Minimum corresponds to all
122	the way left, maximum to right.</entry>
123		  </row>
124		  <row>
125		    <entry><constant>V4L2_CID_AUDIO_BASS</constant></entry>
126		    <entry>integer</entry>
127		    <entry>Audio bass adjustment.</entry>
128		  </row>
129		  <row>
130		    <entry><constant>V4L2_CID_AUDIO_TREBLE</constant></entry>
131		    <entry>integer</entry>
132		    <entry>Audio treble adjustment.</entry>
133		  </row>
134		  <row>
135		    <entry><constant>V4L2_CID_AUDIO_MUTE</constant></entry>
136		    <entry>boolean</entry>
137		    <entry>Mute audio, &ie; set the volume to zero, however
138	without affecting <constant>V4L2_CID_AUDIO_VOLUME</constant>. Like
139	ALSA drivers, V4L2 drivers must mute at load time to avoid excessive
140	noise. Actually the entire device should be reset to a low power
141	consumption state.</entry>
142		  </row>
143		  <row>
144		    <entry><constant>V4L2_CID_AUDIO_LOUDNESS</constant></entry>
145		    <entry>boolean</entry>
146		    <entry>Loudness mode (bass boost).</entry>
147		  </row>
148		  <row>
149		    <entry><constant>V4L2_CID_BLACK_LEVEL</constant></entry>
150		    <entry>integer</entry>
151		    <entry>Another name for brightness (not a synonym of
152	<constant>V4L2_CID_BRIGHTNESS</constant>). This control is deprecated
153	and should not be used in new drivers and applications.</entry>
154		  </row>
155		  <row>
156		    <entry><constant>V4L2_CID_AUTO_WHITE_BALANCE</constant></entry>
157		    <entry>boolean</entry>
158		    <entry>Automatic white balance (cameras).</entry>
159		  </row>
160		  <row>
161		    <entry><constant>V4L2_CID_DO_WHITE_BALANCE</constant></entry>
162		    <entry>button</entry>
163		    <entry>This is an action control. When set (the value is
164	ignored), the device will do a white balance and then hold the current
165	setting. Contrast this with the boolean
166	<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant>, which, when
167	activated, keeps adjusting the white balance.</entry>
168		  </row>
169		  <row>
170		    <entry><constant>V4L2_CID_RED_BALANCE</constant></entry>
171		    <entry>integer</entry>
172		    <entry>Red chroma balance.</entry>
173		  </row>
174		  <row>
175		    <entry><constant>V4L2_CID_BLUE_BALANCE</constant></entry>
176		    <entry>integer</entry>
177		    <entry>Blue chroma balance.</entry>
178		  </row>
179		  <row>
180		    <entry><constant>V4L2_CID_GAMMA</constant></entry>
181		    <entry>integer</entry>
182		    <entry>Gamma adjust.</entry>
183		  </row>
184		  <row>
185		    <entry><constant>V4L2_CID_WHITENESS</constant></entry>
186		    <entry>integer</entry>
187		    <entry>Whiteness for grey-scale devices. This is a synonym
188	for <constant>V4L2_CID_GAMMA</constant>. This control is deprecated
189	and should not be used in new drivers and applications.</entry>
190		  </row>
191		  <row>
192		    <entry><constant>V4L2_CID_EXPOSURE</constant></entry>
193		    <entry>integer</entry>
194		    <entry>Exposure (cameras). [Unit?]</entry>
195		  </row>
196		  <row>
197		    <entry><constant>V4L2_CID_AUTOGAIN</constant></entry>
198		    <entry>boolean</entry>
199		    <entry>Automatic gain/exposure control.</entry>
200		  </row>
201		  <row>
202		    <entry><constant>V4L2_CID_GAIN</constant></entry>
203		    <entry>integer</entry>
204		    <entry>Gain control.</entry>
205		  </row>
206		  <row>
207		    <entry><constant>V4L2_CID_HFLIP</constant></entry>
208		    <entry>boolean</entry>
209		    <entry>Mirror the picture horizontally.</entry>
210		  </row>
211		  <row>
212		    <entry><constant>V4L2_CID_VFLIP</constant></entry>
213		    <entry>boolean</entry>
214		    <entry>Mirror the picture vertically.</entry>
215		  </row>
216		  <row id="v4l2-power-line-frequency">
217		    <entry><constant>V4L2_CID_POWER_LINE_FREQUENCY</constant></entry>
218		    <entry>enum</entry>
219		    <entry>Enables a power line frequency filter to avoid
220	flicker. Possible values for <constant>enum v4l2_power_line_frequency</constant> are:
221	<constant>V4L2_CID_POWER_LINE_FREQUENCY_DISABLED</constant> (0),
222	<constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1),
223	<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2) and
224	<constant>V4L2_CID_POWER_LINE_FREQUENCY_AUTO</constant> (3).</entry>
225		  </row>
226		  <row>
227		    <entry><constant>V4L2_CID_HUE_AUTO</constant></entry>
228		    <entry>boolean</entry>
229		    <entry>Enables automatic hue control by the device. The
230	effect of setting <constant>V4L2_CID_HUE</constant> while automatic
231	hue control is enabled is undefined, drivers should ignore such
232	request.</entry>
233		  </row>
234		  <row>
235		    <entry><constant>V4L2_CID_WHITE_BALANCE_TEMPERATURE</constant></entry>
236		    <entry>integer</entry>
237		    <entry>This control specifies the white balance settings
238	as a color temperature in Kelvin. A driver should have a minimum of
239	2800 (incandescent) to 6500 (daylight). For more information about
240	color temperature see <ulink
241	url="http://en.wikipedia.org/wiki/Color_temperature">Wikipedia</ulink>.</entry>
242		  </row>
243		  <row>
244		    <entry><constant>V4L2_CID_SHARPNESS</constant></entry>
245		    <entry>integer</entry>
246		    <entry>Adjusts the sharpness filters in a camera. The
247	minimum value disables the filters, higher values give a sharper
248	picture.</entry>
249		  </row>
250		  <row>
251		    <entry><constant>V4L2_CID_BACKLIGHT_COMPENSATION</constant></entry>
252		    <entry>integer</entry>
253		    <entry>Adjusts the backlight compensation in a camera. The
254	minimum value disables backlight compensation.</entry>
255		  </row>
256		  <row>
257		    <entry><constant>V4L2_CID_CHROMA_AGC</constant></entry>
258		    <entry>boolean</entry>
259		    <entry>Chroma automatic gain control.</entry>
260		  </row>
261		  <row>
262		    <entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry>
263		    <entry>integer</entry>
264		    <entry>Adjusts the Chroma gain control (for use when chroma AGC
265		    is disabled).</entry>
266		  </row>
267		  <row>
268		    <entry><constant>V4L2_CID_COLOR_KILLER</constant></entry>
269		    <entry>boolean</entry>
270		    <entry>Enable the color killer (&ie; force a black &amp; white image in case of a weak video signal).</entry>
271		  </row>
272		  <row id="v4l2-colorfx">
273		    <entry><constant>V4L2_CID_COLORFX</constant></entry>
274		    <entry>enum</entry>
275		    <entry>Selects a color effect. The following values are defined:
276		    </entry>
277		  </row><row>
278		  <entry></entry>
279		  <entry></entry>
280		    <entrytbl spanname="descr" cols="2">
281		      <tbody valign="top">
282			<row>
283			  <entry><constant>V4L2_COLORFX_NONE</constant>&nbsp;</entry>
284			  <entry>Color effect is disabled.</entry>
285			</row>
286			<row>
287			  <entry><constant>V4L2_COLORFX_ANTIQUE</constant>&nbsp;</entry>
288			  <entry>An aging (old photo) effect.</entry>
289			</row>
290			<row>
291			  <entry><constant>V4L2_COLORFX_ART_FREEZE</constant>&nbsp;</entry>
292			  <entry>Frost color effect.</entry>
293			</row>
294			<row>
295			  <entry><constant>V4L2_COLORFX_AQUA</constant>&nbsp;</entry>
296			  <entry>Water color, cool tone.</entry>
297			</row>
298			<row>
299			  <entry><constant>V4L2_COLORFX_BW</constant>&nbsp;</entry>
300			  <entry>Black and white.</entry>
301			</row>
302			<row>
303			  <entry><constant>V4L2_COLORFX_EMBOSS</constant>&nbsp;</entry>
304			  <entry>Emboss, the highlights and shadows replace light/dark boundaries
305			  and low contrast areas are set to a gray background.</entry>
306			</row>
307			<row>
308			  <entry><constant>V4L2_COLORFX_GRASS_GREEN</constant>&nbsp;</entry>
309			  <entry>Grass green.</entry>
310			</row>
311			<row>
312			  <entry><constant>V4L2_COLORFX_NEGATIVE</constant>&nbsp;</entry>
313			  <entry>Negative.</entry>
314			</row>
315			<row>
316			  <entry><constant>V4L2_COLORFX_SEPIA</constant>&nbsp;</entry>
317			  <entry>Sepia tone.</entry>
318			</row>
319			<row>
320			  <entry><constant>V4L2_COLORFX_SKETCH</constant>&nbsp;</entry>
321			  <entry>Sketch.</entry>
322			</row>
323			<row>
324			  <entry><constant>V4L2_COLORFX_SKIN_WHITEN</constant>&nbsp;</entry>
325			  <entry>Skin whiten.</entry>
326			</row>
327			<row>
328			  <entry><constant>V4L2_COLORFX_SKY_BLUE</constant>&nbsp;</entry>
329			  <entry>Sky blue.</entry>
330			</row>
331			<row>
332			  <entry><constant>V4L2_COLORFX_SOLARIZATION</constant>&nbsp;</entry>
333			  <entry>Solarization, the image is partially reversed in tone,
334			  only color values above or below a certain threshold are inverted.
335			  </entry>
336			</row>
337			<row>
338			  <entry><constant>V4L2_COLORFX_SILHOUETTE</constant>&nbsp;</entry>
339			  <entry>Silhouette (outline).</entry>
340			</row>
341			<row>
342			  <entry><constant>V4L2_COLORFX_VIVID</constant>&nbsp;</entry>
343			  <entry>Vivid colors.</entry>
344			</row>
345			<row>
346			  <entry><constant>V4L2_COLORFX_SET_CBCR</constant>&nbsp;</entry>
347			  <entry>The Cb and Cr chroma components are replaced by fixed
348			  coefficients determined by <constant>V4L2_CID_COLORFX_CBCR</constant>
349			  control.</entry>
350			</row>
351		      </tbody>
352		    </entrytbl>
353		  </row>
354		  <row>
355		    <entry><constant>V4L2_CID_COLORFX_CBCR</constant></entry>
356		    <entry>integer</entry>
357		    <entry>Determines the Cb and Cr coefficients for <constant>V4L2_COLORFX_SET_CBCR</constant>
358		    color effect. Bits [7:0] of the supplied 32 bit value are interpreted as
359		    Cr component, bits [15:8] as Cb component and bits [31:16] must be zero.
360		  </entry>
361		  </row>
362		  <row>
363		    <entry><constant>V4L2_CID_AUTOBRIGHTNESS</constant></entry>
364		    <entry>boolean</entry>
365		    <entry>Enable Automatic Brightness.</entry>
366		  </row>
367		  <row>
368		    <entry><constant>V4L2_CID_ROTATE</constant></entry>
369		    <entry>integer</entry>
370		    <entry>Rotates the image by specified angle. Common angles are 90,
371		    270 and 180. Rotating the image to 90 and 270 will reverse the height
372		    and width of the display window. It is necessary to set the new height and
373		    width of the picture using the &VIDIOC-S-FMT; ioctl according to
374		    the rotation angle selected.</entry>
375		  </row>
376		  <row>
377		    <entry><constant>V4L2_CID_BG_COLOR</constant></entry>
378		    <entry>integer</entry>
379		    <entry>Sets the background color on the current output device.
380		    Background color needs to be specified in the RGB24 format. The
381		    supplied 32 bit value is interpreted as bits 0-7 Red color information,
382		    bits 8-15 Green color information, bits 16-23 Blue color
383		    information and bits 24-31 must be zero.</entry>
384		  </row>
385		  <row>
386		    <entry><constant>V4L2_CID_ILLUMINATORS_1</constant>
387			<constant>V4L2_CID_ILLUMINATORS_2</constant></entry>
388		    <entry>boolean</entry>
389		    <entry>Switch on or off the illuminator 1 or 2 of the device
390			(usually a microscope).</entry>
391		  </row>
392		  <row>
393		    <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry>
394		    <entry>integer</entry>
395		    <entry>This is a read-only control that can be read by the application
396	and used as a hint to determine the number of CAPTURE buffers to pass to REQBUFS.
397	The value is the minimum number of CAPTURE buffers that is necessary for hardware
398	to work.</entry>
399		  </row>
400		  <row>
401		    <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_OUTPUT</constant></entry>
402		    <entry>integer</entry>
403		    <entry>This is a read-only control that can be read by the application
404	and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS.
405	The value is the minimum number of OUTPUT buffers that is necessary for hardware
406	to work.</entry>
407		  </row>
408		  <row id="v4l2-alpha-component">
409		    <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry>
410		    <entry>integer</entry>
411		    <entry>Sets the alpha color component. When a capture device (or
412		    capture queue of a mem-to-mem device) produces a frame format that
413		    includes an alpha component
414		    (e.g. <link linkend="rgb-formats">packed RGB image formats</link>)
415		    and the alpha value is not defined by the device or the mem-to-mem
416		    input data this control lets you select the alpha component value of
417		    all pixels. When an output device (or output queue of a mem-to-mem
418		    device) consumes a frame format that doesn't include an alpha
419		    component and the device supports alpha channel processing this
420		    control lets you set the alpha component value of all pixels for
421		    further processing in the device.
422		    </entry>
423		  </row>
424		  <row>
425		    <entry><constant>V4L2_CID_LASTP1</constant></entry>
426		    <entry></entry>
427		    <entry>End of the predefined control IDs (currently
428		      <constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry>
429		  </row>
430		  <row>
431		    <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry>
432		    <entry></entry>
433		    <entry>ID of the first custom (driver specific) control.
434	Applications depending on particular custom controls should check the
435	driver name and version, see <xref linkend="querycap" />.</entry>
436		  </row>
437		</tbody>
438	      </tgroup>
439	    </table>
440	
441	    <para>Applications can enumerate the available controls with the
442	&VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls, get and set a
443	control value with the &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls.
444	Drivers must implement <constant>VIDIOC_QUERYCTRL</constant>,
445	<constant>VIDIOC_G_CTRL</constant> and
446	<constant>VIDIOC_S_CTRL</constant> when the device has one or more
447	controls, <constant>VIDIOC_QUERYMENU</constant> when it has one or
448	more menu type controls.</para>
449	
450	    <example id="enum_all_controls">
451	      <title>Enumerating all user controls</title>
452	
453	      <programlisting>
454	&v4l2-queryctrl; queryctrl;
455	&v4l2-querymenu; querymenu;
456	
457	static void enumerate_menu(void)
458	{
459		printf("  Menu items:\n");
460	
461		memset(&amp;querymenu, 0, sizeof(querymenu));
462		querymenu.id = queryctrl.id;
463	
464		for (querymenu.index = queryctrl.minimum;
465		     querymenu.index &lt;= queryctrl.maximum;
466		     querymenu.index++) {
467			if (0 == ioctl(fd, &VIDIOC-QUERYMENU;, &amp;querymenu)) {
468				printf("  %s\n", querymenu.name);
469			}
470		}
471	}
472	
473	memset(&amp;queryctrl, 0, sizeof(queryctrl));
474	
475	for (queryctrl.id = V4L2_CID_BASE;
476	     queryctrl.id &lt; V4L2_CID_LASTP1;
477	     queryctrl.id++) {
478		if (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
479			if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
480				continue;
481	
482			printf("Control %s\n", queryctrl.name);
483	
484			if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
485				enumerate_menu();
486		} else {
487			if (errno == EINVAL)
488				continue;
489	
490			perror("VIDIOC_QUERYCTRL");
491			exit(EXIT_FAILURE);
492		}
493	}
494	
495	for (queryctrl.id = V4L2_CID_PRIVATE_BASE;;
496	     queryctrl.id++) {
497		if (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
498			if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
499				continue;
500	
501			printf("Control %s\n", queryctrl.name);
502	
503			if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
504				enumerate_menu();
505		} else {
506			if (errno == EINVAL)
507				break;
508	
509			perror("VIDIOC_QUERYCTRL");
510			exit(EXIT_FAILURE);
511		}
512	}
513	</programlisting>
514	    </example>
515	
516	    <example>
517	      <title>Enumerating all user controls (alternative)</title>
518		<programlisting>
519	memset(&amp;queryctrl, 0, sizeof(queryctrl));
520	
521	queryctrl.id = V4L2_CTRL_CLASS_USER | V4L2_CTRL_FLAG_NEXT_CTRL;
522	while (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
523		if (V4L2_CTRL_ID2CLASS(queryctrl.id) != V4L2_CTRL_CLASS_USER)
524			break;
525		if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
526			continue;
527	
528		printf("Control %s\n", queryctrl.name);
529	
530		if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
531			enumerate_menu();
532	
533		queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
534	}
535	if (errno != EINVAL) {
536		perror("VIDIOC_QUERYCTRL");
537		exit(EXIT_FAILURE);
538	}
539	</programlisting>
540	    </example>
541	
542	    <example>
543	      <title>Changing controls</title>
544	
545	      <programlisting>
546	&v4l2-queryctrl; queryctrl;
547	&v4l2-control; control;
548	
549	memset(&amp;queryctrl, 0, sizeof(queryctrl));
550	queryctrl.id = V4L2_CID_BRIGHTNESS;
551	
552	if (-1 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
553		if (errno != EINVAL) {
554			perror("VIDIOC_QUERYCTRL");
555			exit(EXIT_FAILURE);
556		} else {
557			printf("V4L2_CID_BRIGHTNESS is not supported\n");
558		}
559	} else if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED) {
560		printf("V4L2_CID_BRIGHTNESS is not supported\n");
561	} else {
562		memset(&amp;control, 0, sizeof (control));
563		control.id = V4L2_CID_BRIGHTNESS;
564		control.value = queryctrl.default_value;
565	
566		if (-1 == ioctl(fd, &VIDIOC-S-CTRL;, &amp;control)) {
567			perror("VIDIOC_S_CTRL");
568			exit(EXIT_FAILURE);
569		}
570	}
571	
572	memset(&amp;control, 0, sizeof(control));
573	control.id = V4L2_CID_CONTRAST;
574	
575	if (0 == ioctl(fd, &VIDIOC-G-CTRL;, &amp;control)) {
576		control.value += 1;
577	
578		/* The driver may clamp the value or return ERANGE, ignored here */
579	
580		if (-1 == ioctl(fd, &VIDIOC-S-CTRL;, &amp;control)
581		    &amp;&amp; errno != ERANGE) {
582			perror("VIDIOC_S_CTRL");
583			exit(EXIT_FAILURE);
584		}
585	/* Ignore if V4L2_CID_CONTRAST is unsupported */
586	} else if (errno != EINVAL) {
587		perror("VIDIOC_G_CTRL");
588		exit(EXIT_FAILURE);
589	}
590	
591	control.id = V4L2_CID_AUDIO_MUTE;
592	control.value = 1; /* silence */
593	
594	/* Errors ignored */
595	ioctl(fd, VIDIOC_S_CTRL, &amp;control);
596	</programlisting>
597	    </example>
598	  </section>
599	
600	  <section id="extended-controls">
601	    <title>Extended Controls</title>
602	
603	    <section>
604	      <title>Introduction</title>
605	
606	      <para>The control mechanism as originally designed was meant
607	to be used for user settings (brightness, saturation, etc). However,
608	it turned out to be a very useful model for implementing more
609	complicated driver APIs where each driver implements only a subset of
610	a larger API.</para>
611	
612	      <para>The MPEG encoding API was the driving force behind
613	designing and implementing this extended control mechanism: the MPEG
614	standard is quite large and the currently supported hardware MPEG
615	encoders each only implement a subset of this standard. Further more,
616	many parameters relating to how the video is encoded into an MPEG
617	stream are specific to the MPEG encoding chip since the MPEG standard
618	only defines the format of the resulting MPEG stream, not how the
619	video is actually encoded into that format.</para>
620	
621	      <para>Unfortunately, the original control API lacked some
622	features needed for these new uses and so it was extended into the
623	(not terribly originally named) extended control API.</para>
624	
625	      <para>Even though the MPEG encoding API was the first effort
626	to use the Extended Control API, nowadays there are also other classes
627	of Extended Controls, such as Camera Controls and FM Transmitter Controls.
628	The Extended Controls API as well as all Extended Controls classes are
629	described in the following text.</para>
630	    </section>
631	
632	    <section>
633	      <title>The Extended Control API</title>
634	
635	      <para>Three new ioctls are available: &VIDIOC-G-EXT-CTRLS;,
636	&VIDIOC-S-EXT-CTRLS; and &VIDIOC-TRY-EXT-CTRLS;. These ioctls act on
637	arrays of controls (as opposed to the &VIDIOC-G-CTRL; and
638	&VIDIOC-S-CTRL; ioctls that act on a single control). This is needed
639	since it is often required to atomically change several controls at
640	once.</para>
641	
642	      <para>Each of the new ioctls expects a pointer to a
643	&v4l2-ext-controls;. This structure contains a pointer to the control
644	array, a count of the number of controls in that array and a control
645	class. Control classes are used to group similar controls into a
646	single class. For example, control class
647	<constant>V4L2_CTRL_CLASS_USER</constant> contains all user controls
648	(&ie; all controls that can also be set using the old
649	<constant>VIDIOC_S_CTRL</constant> ioctl). Control class
650	<constant>V4L2_CTRL_CLASS_MPEG</constant> contains all controls
651	relating to MPEG encoding, etc.</para>
652	
653	      <para>All controls in the control array must belong to the
654	specified control class. An error is returned if this is not the
655	case.</para>
656	
657	      <para>It is also possible to use an empty control array (count
658	== 0) to check whether the specified control class is
659	supported.</para>
660	
661	      <para>The control array is a &v4l2-ext-control; array. The
662	<structname>v4l2_ext_control</structname> structure is very similar to
663	&v4l2-control;, except for the fact that it also allows for 64-bit
664	values and pointers to be passed.</para>
665	
666	      <para>Since the &v4l2-ext-control; supports pointers it is now
667	also possible to have controls with compound types such as N-dimensional arrays
668	and/or structures. You need to specify the <constant>V4L2_CTRL_FLAG_NEXT_COMPOUND</constant>
669	when enumerating controls to actually be able to see such compound controls.
670	In other words, these controls with compound types should only be used
671	programmatically.</para>
672	
673	      <para>Since such compound controls need to expose more information
674	about themselves than is possible with &VIDIOC-QUERYCTRL; the
675	&VIDIOC-QUERY-EXT-CTRL; ioctl was added. In particular, this ioctl gives
676	the dimensions of the N-dimensional array if this control consists of more than
677	one element.</para>
678	
679	      <para>It is important to realize that due to the flexibility of
680	controls it is necessary to check whether the control you want to set
681	actually is supported in the driver and what the valid range of values
682	is. So use the &VIDIOC-QUERYCTRL; (or &VIDIOC-QUERY-EXT-CTRL;) and
683	&VIDIOC-QUERYMENU; ioctls to check this. Also note that it is possible
684	that some of the menu indices in a control of type
685	<constant>V4L2_CTRL_TYPE_MENU</constant> may not be supported
686	(<constant>VIDIOC_QUERYMENU</constant> will return an error). A good
687	example is the list of supported MPEG audio bitrates. Some drivers only
688	support one or two bitrates, others support a wider range.</para>
689	
690	      <para>
691		All controls use machine endianness.
692	      </para>
693	    </section>
694	
695	    <section>
696	      <title>Enumerating Extended Controls</title>
697	
698	      <para>The recommended way to enumerate over the extended
699	controls is by using &VIDIOC-QUERYCTRL; in combination with the
700	<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag:</para>
701	
702	      <informalexample>
703		<programlisting>
704	&v4l2-queryctrl; qctrl;
705	
706	qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
707	while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;qctrl)) {
708		/* ... */
709		qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
710	}
711	</programlisting>
712	      </informalexample>
713	
714	      <para>The initial control ID is set to 0 ORed with the
715	<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag. The
716	<constant>VIDIOC_QUERYCTRL</constant> ioctl will return the first
717	control with a higher ID than the specified one. When no such controls
718	are found an error is returned.</para>
719	
720	      <para>If you want to get all controls within a specific control
721	class, then you can set the initial
722	<structfield>qctrl.id</structfield> value to the control class and add
723	an extra check to break out of the loop when a control of another
724	control class is found:</para>
725	
726	      <informalexample>
727		<programlisting>
728	qctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CTRL_FLAG_NEXT_CTRL;
729	while (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;qctrl)) {
730		if (V4L2_CTRL_ID2CLASS(qctrl.id) != V4L2_CTRL_CLASS_MPEG)
731			break;
732			/* ... */
733		qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
734	}
735	</programlisting>
736	      </informalexample>
737	
738	      <para>The 32-bit <structfield>qctrl.id</structfield> value is
739	subdivided into three bit ranges: the top 4 bits are reserved for
740	flags (&eg; <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>) and are not
741	actually part of the ID. The remaining 28 bits form the control ID, of
742	which the most significant 12 bits define the control class and the
743	least significant 16 bits identify the control within the control
744	class. It is guaranteed that these last 16 bits are always non-zero
745	for controls. The range of 0x1000 and up are reserved for
746	driver-specific controls. The macro
747	<constant>V4L2_CTRL_ID2CLASS(id)</constant> returns the control class
748	ID based on a control ID.</para>
749	
750	      <para>If the driver does not support extended controls, then
751	<constant>VIDIOC_QUERYCTRL</constant> will fail when used in
752	combination with <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>. In
753	that case the old method of enumerating control should be used (see
754	<xref linkend="enum_all_controls" />). But if it is supported, then it is guaranteed to enumerate over
755	all controls, including driver-private controls.</para>
756	    </section>
757	
758	    <section>
759	      <title>Creating Control Panels</title>
760	
761	      <para>It is possible to create control panels for a graphical
762	user interface where the user can select the various controls.
763	Basically you will have to iterate over all controls using the method
764	described above. Each control class starts with a control of type
765	<constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant>.
766	<constant>VIDIOC_QUERYCTRL</constant> will return the name of this
767	control class which can be used as the title of a tab page within a
768	control panel.</para>
769	
770	      <para>The flags field of &v4l2-queryctrl; also contains hints on
771	the behavior of the control. See the &VIDIOC-QUERYCTRL; documentation
772	for more details.</para>
773	    </section>
774	
775	    <section id="mpeg-controls">
776	      <title>Codec Control Reference</title>
777	
778	      <para>Below all controls within the Codec control class are
779	described. First the generic controls, then controls specific for
780	certain hardware.</para>
781	
782	      <para>Note: These controls are applicable to all codecs and
783	not just MPEG. The defines are prefixed with V4L2_CID_MPEG/V4L2_MPEG
784	as the controls were originally made for MPEG codecs and later
785	extended to cover all encoding formats.</para>
786	
787	      <section>
788		<title>Generic Codec Controls</title>
789	
790		<table pgwide="1" frame="none" id="mpeg-control-id">
791		  <title>Codec Control IDs</title>
792		  <tgroup cols="4">
793		    <colspec colname="c1" colwidth="1*" />
794		    <colspec colname="c2" colwidth="6*" />
795		    <colspec colname="c3" colwidth="2*" />
796		    <colspec colname="c4" colwidth="6*" />
797		    <spanspec namest="c1" nameend="c2" spanname="id" />
798		    <spanspec namest="c2" nameend="c4" spanname="descr" />
799		    <thead>
800		      <row>
801			<entry spanname="id" align="left">ID</entry>
802			<entry align="left">Type</entry>
803		      </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
804		      </row>
805		    </thead>
806		    <tbody valign="top">
807		      <row><entry></entry></row>
808		      <row>
809			<entry spanname="id"><constant>V4L2_CID_MPEG_CLASS</constant>&nbsp;</entry>
810			<entry>class</entry>
811		      </row><row><entry spanname="descr">The Codec class
812	descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
813	description of this control class. This description can be used as the
814	caption of a Tab page in a GUI, for example.</entry>
815		      </row>
816		      <row><entry></entry></row>
817		      <row id="v4l2-mpeg-stream-type">
818			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_TYPE</constant>&nbsp;</entry>
819			<entry>enum&nbsp;v4l2_mpeg_stream_type</entry>
820		      </row><row><entry spanname="descr">The MPEG-1, -2 or -4
821	output stream type. One cannot assume anything here. Each hardware
822	MPEG encoder tends to support different subsets of the available MPEG
823	stream types. This control is specific to multiplexed MPEG streams.
824	The currently defined stream types are:</entry>
825		      </row>
826		      <row>
827			<entrytbl spanname="descr" cols="2">
828			  <tbody valign="top">
829			    <row>
830			      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_PS</constant>&nbsp;</entry>
831			      <entry>MPEG-2 program stream</entry>
832			    </row>
833			    <row>
834			      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_TS</constant>&nbsp;</entry>
835			      <entry>MPEG-2 transport stream</entry>
836			    </row>
837			    <row>
838			      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_SS</constant>&nbsp;</entry>
839			      <entry>MPEG-1 system stream</entry>
840			    </row>
841			    <row>
842			      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_DVD</constant>&nbsp;</entry>
843			      <entry>MPEG-2 DVD-compatible stream</entry>
844			    </row>
845			    <row>
846			      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_VCD</constant>&nbsp;</entry>
847			      <entry>MPEG-1 VCD-compatible stream</entry>
848			    </row>
849			    <row>
850			      <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD</constant>&nbsp;</entry>
851			      <entry>MPEG-2 SVCD-compatible stream</entry>
852			    </row>
853			  </tbody>
854			</entrytbl>
855		      </row>
856		      <row><entry></entry></row>
857		      <row>
858			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PMT</constant>&nbsp;</entry>
859			<entry>integer</entry>
860		      </row><row><entry spanname="descr">Program Map Table
861	Packet ID for the MPEG transport stream (default 16)</entry>
862		      </row>
863		      <row><entry></entry></row>
864		      <row>
865			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_AUDIO</constant>&nbsp;</entry>
866			<entry>integer</entry>
867		      </row><row><entry spanname="descr">Audio Packet ID for
868	the MPEG transport stream (default 256)</entry>
869		      </row>
870		      <row><entry></entry></row>
871		      <row>
872			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_VIDEO</constant>&nbsp;</entry>
873			<entry>integer</entry>
874		      </row><row><entry spanname="descr">Video Packet ID for
875	the MPEG transport stream (default 260)</entry>
876		      </row>
877		      <row><entry></entry></row>
878		      <row>
879			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PCR</constant>&nbsp;</entry>
880			<entry>integer</entry>
881		      </row><row><entry spanname="descr">Packet ID for the
882	MPEG transport stream carrying PCR fields (default 259)</entry>
883		      </row>
884		      <row><entry></entry></row>
885		      <row>
886			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_AUDIO</constant>&nbsp;</entry>
887			<entry>integer</entry>
888		      </row><row><entry spanname="descr">Audio ID for MPEG
889	PES</entry>
890		      </row>
891		      <row><entry></entry></row>
892		      <row>
893			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_VIDEO</constant>&nbsp;</entry>
894			<entry>integer</entry>
895		      </row><row><entry spanname="descr">Video ID for MPEG
896	PES</entry>
897		      </row>
898		      <row><entry></entry></row>
899		      <row id="v4l2-mpeg-stream-vbi-fmt">
900			<entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_VBI_FMT</constant>&nbsp;</entry>
901			<entry>enum&nbsp;v4l2_mpeg_stream_vbi_fmt</entry>
902		      </row><row><entry spanname="descr">Some cards can embed
903	VBI data (&eg; Closed Caption, Teletext) into the MPEG stream. This
904	control selects whether VBI data should be embedded, and if so, what
905	embedding method should be used. The list of possible VBI formats
906	depends on the driver. The currently defined VBI format types
907	are:</entry>
908		      </row>
909		      <row>
910			<entrytbl spanname="descr" cols="2">
911			  <tbody valign="top">
912			    <row>
913			      <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_NONE</constant>&nbsp;</entry>
914			      <entry>No VBI in the MPEG stream</entry>
915			    </row>
916			    <row>
917			      <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant>&nbsp;</entry>
918			      <entry>VBI in private packets, IVTV format (documented
919	in the kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.vbi</filename>)</entry>
920			    </row>
921			  </tbody>
922			</entrytbl>
923		      </row>
924		      <row><entry></entry></row>
925		      <row id="v4l2-mpeg-audio-sampling-freq">
926			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ</constant>&nbsp;</entry>
927			<entry>enum&nbsp;v4l2_mpeg_audio_sampling_freq</entry>
928		      </row><row><entry spanname="descr">MPEG Audio sampling
929	frequency. Possible values are:</entry>
930		      </row>
931		      <row>
932			<entrytbl spanname="descr" cols="2">
933			  <tbody valign="top">
934			    <row>
935			      <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100</constant>&nbsp;</entry>
936			      <entry>44.1 kHz</entry>
937			    </row>
938			    <row>
939			      <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000</constant>&nbsp;</entry>
940			      <entry>48 kHz</entry>
941			    </row>
942			    <row>
943			      <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000</constant>&nbsp;</entry>
944			      <entry>32 kHz</entry>
945			    </row>
946			  </tbody>
947			</entrytbl>
948		      </row>
949		      <row><entry></entry></row>
950		      <row id="v4l2-mpeg-audio-encoding">
951			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_ENCODING</constant>&nbsp;</entry>
952			<entry>enum&nbsp;v4l2_mpeg_audio_encoding</entry>
953		      </row><row><entry spanname="descr">MPEG Audio encoding.
954	This control is specific to multiplexed MPEG streams.
955	Possible values are:</entry>
956		      </row>
957		      <row>
958			<entrytbl spanname="descr" cols="2">
959			  <tbody valign="top">
960			    <row>
961			      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_1</constant>&nbsp;</entry>
962			      <entry>MPEG-1/2 Layer I encoding</entry>
963			    </row>
964			    <row>
965			      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_2</constant>&nbsp;</entry>
966			      <entry>MPEG-1/2 Layer II encoding</entry>
967			    </row>
968			    <row>
969			      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_3</constant>&nbsp;</entry>
970			      <entry>MPEG-1/2 Layer III encoding</entry>
971			    </row>
972			    <row>
973			      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant>&nbsp;</entry>
974			      <entry>MPEG-2/4 AAC (Advanced Audio Coding)</entry>
975			    </row>
976			    <row>
977			      <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant>&nbsp;</entry>
978			      <entry>AC-3 aka ATSC A/52 encoding</entry>
979			    </row>
980			  </tbody>
981			</entrytbl>
982		      </row>
983		      <row><entry></entry></row>
984		      <row id="v4l2-mpeg-audio-l1-bitrate">
985			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L1_BITRATE</constant>&nbsp;</entry>
986			<entry>enum&nbsp;v4l2_mpeg_audio_l1_bitrate</entry>
987		      </row><row><entry spanname="descr">MPEG-1/2 Layer I bitrate.
988	Possible values are:</entry>
989		      </row>
990		      <row>
991			<entrytbl spanname="descr" cols="2">
992			  <tbody valign="top">
993			    <row>
994			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_32K</constant>&nbsp;</entry>
995			      <entry>32 kbit/s</entry></row>
996			    <row>
997			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_64K</constant>&nbsp;</entry>
998			      <entry>64 kbit/s</entry>
999			    </row>
1000			    <row>
1001			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_96K</constant>&nbsp;</entry>
1002			      <entry>96 kbit/s</entry>
1003			    </row>
1004			    <row>
1005			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_128K</constant>&nbsp;</entry>
1006			      <entry>128 kbit/s</entry>
1007			    </row>
1008			    <row>
1009			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_160K</constant>&nbsp;</entry>
1010			      <entry>160 kbit/s</entry>
1011			    </row>
1012			    <row>
1013			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_192K</constant>&nbsp;</entry>
1014			      <entry>192 kbit/s</entry>
1015			    </row>
1016			    <row>
1017			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_224K</constant>&nbsp;</entry>
1018			      <entry>224 kbit/s</entry>
1019			    </row>
1020			    <row>
1021			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_256K</constant>&nbsp;</entry>
1022			      <entry>256 kbit/s</entry>
1023			    </row>
1024			    <row>
1025			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_288K</constant>&nbsp;</entry>
1026			      <entry>288 kbit/s</entry>
1027			    </row>
1028			    <row>
1029			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_320K</constant>&nbsp;</entry>
1030			      <entry>320 kbit/s</entry>
1031			    </row>
1032			    <row>
1033			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_352K</constant>&nbsp;</entry>
1034			      <entry>352 kbit/s</entry>
1035			    </row>
1036			    <row>
1037			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_384K</constant>&nbsp;</entry>
1038			      <entry>384 kbit/s</entry>
1039			    </row>
1040			    <row>
1041			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_416K</constant>&nbsp;</entry>
1042			      <entry>416 kbit/s</entry>
1043			    </row>
1044			    <row>
1045			      <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_448K</constant>&nbsp;</entry>
1046			      <entry>448 kbit/s</entry>
1047			    </row>
1048			  </tbody>
1049			</entrytbl>
1050		      </row>
1051		      <row><entry></entry></row>
1052		      <row id="v4l2-mpeg-audio-l2-bitrate">
1053			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L2_BITRATE</constant>&nbsp;</entry>
1054			<entry>enum&nbsp;v4l2_mpeg_audio_l2_bitrate</entry>
1055		      </row><row><entry spanname="descr">MPEG-1/2 Layer II bitrate.
1056	Possible values are:</entry>
1057		      </row>
1058		      <row>
1059			<entrytbl spanname="descr" cols="2">
1060			  <tbody valign="top">
1061			    <row>
1062			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_32K</constant>&nbsp;</entry>
1063			      <entry>32 kbit/s</entry>
1064			    </row>
1065			    <row>
1066			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_48K</constant>&nbsp;</entry>
1067			      <entry>48 kbit/s</entry>
1068			    </row>
1069			    <row>
1070			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_56K</constant>&nbsp;</entry>
1071			      <entry>56 kbit/s</entry>
1072			    </row>
1073			    <row>
1074			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_64K</constant>&nbsp;</entry>
1075			      <entry>64 kbit/s</entry>
1076			    </row>
1077			    <row>
1078			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_80K</constant>&nbsp;</entry>
1079			      <entry>80 kbit/s</entry>
1080			    </row>
1081			    <row>
1082			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_96K</constant>&nbsp;</entry>
1083			      <entry>96 kbit/s</entry>
1084			    </row>
1085			    <row>
1086			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_112K</constant>&nbsp;</entry>
1087			      <entry>112 kbit/s</entry>
1088			    </row>
1089			    <row>
1090			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_128K</constant>&nbsp;</entry>
1091			      <entry>128 kbit/s</entry>
1092			    </row>
1093			    <row>
1094			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_160K</constant>&nbsp;</entry>
1095			      <entry>160 kbit/s</entry>
1096			    </row>
1097			    <row>
1098			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_192K</constant>&nbsp;</entry>
1099			      <entry>192 kbit/s</entry>
1100			    </row>
1101			    <row>
1102			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_224K</constant>&nbsp;</entry>
1103			      <entry>224 kbit/s</entry>
1104			    </row>
1105			    <row>
1106			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_256K</constant>&nbsp;</entry>
1107			      <entry>256 kbit/s</entry>
1108			    </row>
1109			    <row>
1110			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_320K</constant>&nbsp;</entry>
1111			      <entry>320 kbit/s</entry>
1112			    </row>
1113			    <row>
1114			      <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_384K</constant>&nbsp;</entry>
1115			      <entry>384 kbit/s</entry>
1116			    </row>
1117			  </tbody>
1118			</entrytbl>
1119		      </row>
1120		      <row><entry></entry></row>
1121		      <row id="v4l2-mpeg-audio-l3-bitrate">
1122			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L3_BITRATE</constant>&nbsp;</entry>
1123			<entry>enum&nbsp;v4l2_mpeg_audio_l3_bitrate</entry>
1124		      </row><row><entry spanname="descr">MPEG-1/2 Layer III bitrate.
1125	Possible values are:</entry>
1126		      </row>
1127		      <row>
1128			<entrytbl spanname="descr" cols="2">
1129			  <tbody valign="top">
1130			    <row>
1131			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_32K</constant>&nbsp;</entry>
1132			      <entry>32 kbit/s</entry>
1133			    </row>
1134			    <row>
1135			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_40K</constant>&nbsp;</entry>
1136			      <entry>40 kbit/s</entry>
1137			    </row>
1138			    <row>
1139			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_48K</constant>&nbsp;</entry>
1140			      <entry>48 kbit/s</entry>
1141			    </row>
1142			    <row>
1143			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_56K</constant>&nbsp;</entry>
1144			      <entry>56 kbit/s</entry>
1145			    </row>
1146			    <row>
1147			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_64K</constant>&nbsp;</entry>
1148			      <entry>64 kbit/s</entry>
1149			    </row>
1150			    <row>
1151			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_80K</constant>&nbsp;</entry>
1152			      <entry>80 kbit/s</entry>
1153			    </row>
1154			    <row>
1155			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_96K</constant>&nbsp;</entry>
1156			      <entry>96 kbit/s</entry>
1157			    </row>
1158			    <row>
1159			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_112K</constant>&nbsp;</entry>
1160			      <entry>112 kbit/s</entry>
1161			    </row>
1162			    <row>
1163			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_128K</constant>&nbsp;</entry>
1164			      <entry>128 kbit/s</entry>
1165			    </row>
1166			    <row>
1167			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_160K</constant>&nbsp;</entry>
1168			      <entry>160 kbit/s</entry>
1169			    </row>
1170			    <row>
1171			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_192K</constant>&nbsp;</entry>
1172			      <entry>192 kbit/s</entry>
1173			    </row>
1174			    <row>
1175			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_224K</constant>&nbsp;</entry>
1176			      <entry>224 kbit/s</entry>
1177			    </row>
1178			    <row>
1179			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_256K</constant>&nbsp;</entry>
1180			      <entry>256 kbit/s</entry>
1181			    </row>
1182			    <row>
1183			      <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_320K</constant>&nbsp;</entry>
1184			      <entry>320 kbit/s</entry>
1185			    </row>
1186			  </tbody>
1187			</entrytbl>
1188		      </row>
1189		      <row><entry></entry></row>
1190		      <row>
1191			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AAC_BITRATE</constant>&nbsp;</entry>
1192			<entry>integer</entry>
1193		      </row><row><entry spanname="descr">AAC bitrate in bits per second.</entry>
1194		      </row>
1195		      <row><entry></entry></row>
1196		      <row id="v4l2-mpeg-audio-ac3-bitrate">
1197			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AC3_BITRATE</constant>&nbsp;</entry>
1198			<entry>enum&nbsp;v4l2_mpeg_audio_ac3_bitrate</entry>
1199		      </row><row><entry spanname="descr">AC-3 bitrate.
1200	Possible values are:</entry>
1201		      </row>
1202		      <row>
1203			<entrytbl spanname="descr" cols="2">
1204			  <tbody valign="top">
1205			    <row>
1206			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_32K</constant>&nbsp;</entry>
1207			      <entry>32 kbit/s</entry>
1208			    </row>
1209			    <row>
1210			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_40K</constant>&nbsp;</entry>
1211			      <entry>40 kbit/s</entry>
1212			    </row>
1213			    <row>
1214			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_48K</constant>&nbsp;</entry>
1215			      <entry>48 kbit/s</entry>
1216			    </row>
1217			    <row>
1218			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_56K</constant>&nbsp;</entry>
1219			      <entry>56 kbit/s</entry>
1220			    </row>
1221			    <row>
1222			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_64K</constant>&nbsp;</entry>
1223			      <entry>64 kbit/s</entry>
1224			    </row>
1225			    <row>
1226			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_80K</constant>&nbsp;</entry>
1227			      <entry>80 kbit/s</entry>
1228			    </row>
1229			    <row>
1230			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_96K</constant>&nbsp;</entry>
1231			      <entry>96 kbit/s</entry>
1232			    </row>
1233			    <row>
1234			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_112K</constant>&nbsp;</entry>
1235			      <entry>112 kbit/s</entry>
1236			    </row>
1237			    <row>
1238			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_128K</constant>&nbsp;</entry>
1239			      <entry>128 kbit/s</entry>
1240			    </row>
1241			    <row>
1242			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_160K</constant>&nbsp;</entry>
1243			      <entry>160 kbit/s</entry>
1244			    </row>
1245			    <row>
1246			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_192K</constant>&nbsp;</entry>
1247			      <entry>192 kbit/s</entry>
1248			    </row>
1249			    <row>
1250			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_224K</constant>&nbsp;</entry>
1251			      <entry>224 kbit/s</entry>
1252			    </row>
1253			    <row>
1254			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_256K</constant>&nbsp;</entry>
1255			      <entry>256 kbit/s</entry>
1256			    </row>
1257			    <row>
1258			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_320K</constant>&nbsp;</entry>
1259			      <entry>320 kbit/s</entry>
1260			    </row>
1261			    <row>
1262			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_384K</constant>&nbsp;</entry>
1263			      <entry>384 kbit/s</entry>
1264			    </row>
1265			    <row>
1266			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_448K</constant>&nbsp;</entry>
1267			      <entry>448 kbit/s</entry>
1268			    </row>
1269			    <row>
1270			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_512K</constant>&nbsp;</entry>
1271			      <entry>512 kbit/s</entry>
1272			    </row>
1273			    <row>
1274			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_576K</constant>&nbsp;</entry>
1275			      <entry>576 kbit/s</entry>
1276			    </row>
1277			    <row>
1278			      <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_640K</constant>&nbsp;</entry>
1279			      <entry>640 kbit/s</entry>
1280			    </row>
1281			  </tbody>
1282			</entrytbl>
1283		      </row>
1284		      <row><entry></entry></row>
1285		      <row id="v4l2-mpeg-audio-mode">
1286			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE</constant>&nbsp;</entry>
1287			<entry>enum&nbsp;v4l2_mpeg_audio_mode</entry>
1288		      </row><row><entry spanname="descr">MPEG Audio mode.
1289	Possible values are:</entry>
1290		      </row>
1291		      <row>
1292			<entrytbl spanname="descr" cols="2">
1293			  <tbody valign="top">
1294			    <row>
1295			      <entry><constant>V4L2_MPEG_AUDIO_MODE_STEREO</constant>&nbsp;</entry>
1296			      <entry>Stereo</entry>
1297			    </row>
1298			    <row>
1299			      <entry><constant>V4L2_MPEG_AUDIO_MODE_JOINT_STEREO</constant>&nbsp;</entry>
1300			      <entry>Joint Stereo</entry>
1301			    </row>
1302			    <row>
1303			      <entry><constant>V4L2_MPEG_AUDIO_MODE_DUAL</constant>&nbsp;</entry>
1304			      <entry>Bilingual</entry>
1305			    </row>
1306			    <row>
1307			      <entry><constant>V4L2_MPEG_AUDIO_MODE_MONO</constant>&nbsp;</entry>
1308			      <entry>Mono</entry>
1309			    </row>
1310			  </tbody>
1311			</entrytbl>
1312		      </row>
1313		      <row><entry></entry></row>
1314		      <row id="v4l2-mpeg-audio-mode-extension">
1315			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE_EXTENSION</constant>&nbsp;</entry>
1316			<entry>enum&nbsp;v4l2_mpeg_audio_mode_extension</entry>
1317		      </row><row><entry spanname="descr">Joint Stereo
1318	audio mode extension. In Layer I and II they indicate which subbands
1319	are in intensity stereo. All other subbands are coded in stereo. Layer
1320	III is not (yet) supported. Possible values
1321	are:</entry>
1322		      </row>
1323		      <row>
1324			<entrytbl spanname="descr" cols="2">
1325			  <tbody valign="top">
1326			    <row>
1327			      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4</constant>&nbsp;</entry>
1328			      <entry>Subbands 4-31 in intensity stereo</entry>
1329			    </row>
1330			    <row>
1331			      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8</constant>&nbsp;</entry>
1332			      <entry>Subbands 8-31 in intensity stereo</entry>
1333			    </row>
1334			    <row>
1335			      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12</constant>&nbsp;</entry>
1336			      <entry>Subbands 12-31 in intensity stereo</entry>
1337			    </row>
1338			    <row>
1339			      <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16</constant>&nbsp;</entry>
1340			      <entry>Subbands 16-31 in intensity stereo</entry>
1341			    </row>
1342			  </tbody>
1343			</entrytbl>
1344		      </row>
1345		      <row><entry></entry></row>
1346		      <row id="v4l2-mpeg-audio-emphasis">
1347			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_EMPHASIS</constant>&nbsp;</entry>
1348			<entry>enum&nbsp;v4l2_mpeg_audio_emphasis</entry>
1349		      </row><row><entry spanname="descr">Audio Emphasis.
1350	Possible values are:</entry>
1351		      </row>
1352		      <row>
1353			<entrytbl spanname="descr" cols="2">
1354			  <tbody valign="top">
1355			    <row>
1356			      <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_NONE</constant>&nbsp;</entry>
1357			      <entry>None</entry>
1358			    </row>
1359			    <row>
1360			      <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS</constant>&nbsp;</entry>
1361			      <entry>50/15 microsecond emphasis</entry>
1362			    </row>
1363			    <row>
1364			      <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17</constant>&nbsp;</entry>
1365			      <entry>CCITT J.17</entry>
1366			    </row>
1367			  </tbody>
1368			</entrytbl>
1369		      </row>
1370		      <row><entry></entry></row>
1371		      <row id="v4l2-mpeg-audio-crc">
1372			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_CRC</constant>&nbsp;</entry>
1373			<entry>enum&nbsp;v4l2_mpeg_audio_crc</entry>
1374		      </row><row><entry spanname="descr">CRC method. Possible
1375	values are:</entry>
1376		      </row>
1377		      <row>
1378			<entrytbl spanname="descr" cols="2">
1379			  <tbody valign="top">
1380			    <row>
1381			      <entry><constant>V4L2_MPEG_AUDIO_CRC_NONE</constant>&nbsp;</entry>
1382			      <entry>None</entry>
1383			    </row>
1384			    <row>
1385			      <entry><constant>V4L2_MPEG_AUDIO_CRC_CRC16</constant>&nbsp;</entry>
1386			      <entry>16 bit parity check</entry>
1387			    </row>
1388			  </tbody>
1389			</entrytbl>
1390		      </row>
1391		      <row><entry></entry></row>
1392		      <row>
1393			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MUTE</constant>&nbsp;</entry>
1394			<entry>boolean</entry>
1395		      </row><row><entry spanname="descr">Mutes the audio when
1396	capturing. This is not done by muting audio hardware, which can still
1397	produce a slight hiss, but in the encoder itself, guaranteeing a fixed
1398	and reproducible audio bitstream. 0 = unmuted, 1 = muted.</entry>
1399		      </row>
1400		      <row><entry></entry></row>
1401		      <row id="v4l2-mpeg-audio-dec-playback">
1402			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant>&nbsp;</entry>
1403			<entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
1404		      </row><row><entry spanname="descr">Determines how monolingual audio should be played back.
1405	Possible values are:</entry>
1406		      </row>
1407		      <row>
1408			<entrytbl spanname="descr" cols="2">
1409			  <tbody valign="top">
1410			    <row>
1411			      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO</constant>&nbsp;</entry>
1412			      <entry>Automatically determines the best playback mode.</entry>
1413			    </row>
1414			    <row>
1415			      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant>&nbsp;</entry>
1416			      <entry>Stereo playback.</entry>
1417			    </row>
1418			    <row>
1419			      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant>&nbsp;</entry>
1420			      <entry>Left channel playback.</entry>
1421			    </row>
1422			    <row>
1423			      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant>&nbsp;</entry>
1424			      <entry>Right channel playback.</entry>
1425			    </row>
1426			    <row>
1427			      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant>&nbsp;</entry>
1428			      <entry>Mono playback.</entry>
1429			    </row>
1430			    <row>
1431			      <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant>&nbsp;</entry>
1432			      <entry>Stereo playback with swapped left and right channels.</entry>
1433			    </row>
1434			  </tbody>
1435			</entrytbl>
1436		      </row>
1437		      <row><entry></entry></row>
1438		      <row id="v4l2-mpeg-audio-dec-multilingual-playback">
1439			<entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant>&nbsp;</entry>
1440			<entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
1441		      </row><row><entry spanname="descr">Determines how multilingual audio should be played back.</entry>
1442		      </row>
1443		      <row><entry></entry></row>
1444		      <row id="v4l2-mpeg-video-encoding">
1445			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ENCODING</constant>&nbsp;</entry>
1446			<entry>enum&nbsp;v4l2_mpeg_video_encoding</entry>
1447		      </row><row><entry spanname="descr">MPEG Video encoding
1448	method. This control is specific to multiplexed MPEG streams.
1449	Possible values are:</entry>
1450		      </row>
1451		      <row>
1452			<entrytbl spanname="descr" cols="2">
1453			  <tbody valign="top">
1454			    <row>
1455			      <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_1</constant>&nbsp;</entry>
1456			      <entry>MPEG-1 Video encoding</entry>
1457			    </row>
1458			    <row>
1459			      <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_2</constant>&nbsp;</entry>
1460			      <entry>MPEG-2 Video encoding</entry>
1461			    </row>
1462			    <row>
1463			      <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant>&nbsp;</entry>
1464			      <entry>MPEG-4 AVC (H.264) Video encoding</entry>
1465			    </row>
1466			  </tbody>
1467			</entrytbl>
1468		      </row>
1469		      <row><entry></entry></row>
1470		      <row id="v4l2-mpeg-video-aspect">
1471			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ASPECT</constant>&nbsp;</entry>
1472			<entry>enum&nbsp;v4l2_mpeg_video_aspect</entry>
1473		      </row><row><entry spanname="descr">Video aspect.
1474	Possible values are:</entry>
1475		      </row>
1476		      <row>
1477			<entrytbl spanname="descr" cols="2">
1478			  <tbody valign="top">
1479			    <row>
1480			      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_1x1</constant>&nbsp;</entry>
1481			    </row>
1482			    <row>
1483			      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_4x3</constant>&nbsp;</entry>
1484			    </row>
1485			    <row>
1486			      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_16x9</constant>&nbsp;</entry>
1487			    </row>
1488			    <row>
1489			      <entry><constant>V4L2_MPEG_VIDEO_ASPECT_221x100</constant>&nbsp;</entry>
1490			    </row>
1491			  </tbody>
1492			</entrytbl>
1493		      </row>
1494		      <row><entry></entry></row>
1495		      <row>
1496			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_B_FRAMES</constant>&nbsp;</entry>
1497			<entry>integer</entry>
1498		      </row><row><entry spanname="descr">Number of B-Frames
1499	(default 2)</entry>
1500		      </row>
1501		      <row><entry></entry></row>
1502		      <row>
1503			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_SIZE</constant>&nbsp;</entry>
1504			<entry>integer</entry>
1505		      </row><row><entry spanname="descr">GOP size (default
1506	12)</entry>
1507		      </row>
1508		      <row><entry></entry></row>
1509		      <row>
1510			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_CLOSURE</constant>&nbsp;</entry>
1511			<entry>boolean</entry>
1512		      </row><row><entry spanname="descr">GOP closure (default
1513	1)</entry>
1514		      </row>
1515		      <row><entry></entry></row>
1516		      <row>
1517			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_PULLDOWN</constant>&nbsp;</entry>
1518			<entry>boolean</entry>
1519		      </row><row><entry spanname="descr">Enable 3:2 pulldown
1520	(default 0)</entry>
1521		      </row>
1522		      <row><entry></entry></row>
1523		      <row id="v4l2-mpeg-video-bitrate-mode">
1524			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_MODE</constant>&nbsp;</entry>
1525			<entry>enum&nbsp;v4l2_mpeg_video_bitrate_mode</entry>
1526		      </row><row><entry spanname="descr">Video bitrate mode.
1527	Possible values are:</entry>
1528		      </row>
1529		      <row>
1530			<entrytbl spanname="descr" cols="2">
1531			  <tbody valign="top">
1532			    <row>
1533			      <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_VBR</constant>&nbsp;</entry>
1534			      <entry>Variable bitrate</entry>
1535			    </row>
1536			    <row>
1537			      <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_CBR</constant>&nbsp;</entry>
1538			      <entry>Constant bitrate</entry>
1539			    </row>
1540			  </tbody>
1541			</entrytbl>
1542		      </row>
1543		      <row><entry></entry></row>
1544		      <row>
1545			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE</constant>&nbsp;</entry>
1546			<entry>integer</entry>
1547		      </row><row><entry spanname="descr">Video bitrate in bits
1548	per second.</entry>
1549		      </row>
1550		      <row><entry></entry></row>
1551		      <row>
1552			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_PEAK</constant>&nbsp;</entry>
1553			<entry>integer</entry>
1554		      </row><row><entry spanname="descr">Peak video bitrate in
1555	bits per second. Must be larger or equal to the average video bitrate.
1556	It is ignored if the video bitrate mode is set to constant
1557	bitrate.</entry>
1558		      </row>
1559		      <row><entry></entry></row>
1560		      <row>
1561			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION</constant>&nbsp;</entry>
1562			<entry>integer</entry>
1563		      </row><row><entry spanname="descr">For every captured
1564	frame, skip this many subsequent frames (default 0).</entry>
1565		      </row>
1566		      <row><entry></entry></row>
1567		      <row>
1568			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE</constant>&nbsp;</entry>
1569			<entry>boolean</entry>
1570		      </row>
1571		      <row><entry spanname="descr">"Mutes" the video to a
1572	fixed color when capturing. This is useful for testing, to produce a
1573	fixed video bitstream. 0 = unmuted, 1 = muted.</entry>
1574		      </row>
1575		      <row><entry></entry></row>
1576		      <row>
1577			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE_YUV</constant>&nbsp;</entry>
1578			<entry>integer</entry>
1579		      </row><row><entry spanname="descr">Sets the "mute" color
1580	of the video. The supplied 32-bit integer is interpreted as follows (bit
1581	0 = least significant bit):</entry>
1582		      </row>
1583		      <row>
1584			<entrytbl spanname="descr" cols="2">
1585			  <tbody valign="top">
1586			    <row>
1587			      <entry>Bit 0:7</entry>
1588			      <entry>V chrominance information</entry>
1589			    </row>
1590			    <row>
1591			      <entry>Bit 8:15</entry>
1592			      <entry>U chrominance information</entry>
1593			    </row>
1594			    <row>
1595			      <entry>Bit 16:23</entry>
1596			      <entry>Y luminance information</entry>
1597			    </row>
1598			    <row>
1599			      <entry>Bit 24:31</entry>
1600			      <entry>Must be zero.</entry>
1601			    </row>
1602			  </tbody>
1603			</entrytbl>
1604		      </row>
1605		      <row><entry></entry></row>
1606		      <row id="v4l2-mpeg-video-dec-pts">
1607			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant>&nbsp;</entry>
1608			<entry>integer64</entry>
1609		      </row><row><entry spanname="descr">This read-only control returns the
1610	33-bit video Presentation Time Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of
1611	the currently displayed frame. This is the same PTS as is used in &VIDIOC-DECODER-CMD;.</entry>
1612		      </row>
1613		      <row><entry></entry></row>
1614		      <row id="v4l2-mpeg-video-dec-frame">
1615			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant>&nbsp;</entry>
1616			<entry>integer64</entry>
1617		      </row><row><entry spanname="descr">This read-only control returns the
1618	frame counter of the frame that is currently displayed (decoded). This value is reset to 0 whenever
1619	the decoder is started.</entry>
1620		      </row>
1621	
1622		      <row><entry></entry></row>
1623		      <row>
1624			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE</constant>&nbsp;</entry>
1625			<entry>boolean</entry>
1626		      </row>
1627		      <row><entry spanname="descr">If enabled the decoder expects to receive a single slice per buffer, otherwise
1628	the decoder expects a single frame in per buffer. Applicable to the decoder, all codecs.
1629	</entry>
1630		      </row>
1631	
1632		      <row><entry></entry></row>
1633		      <row>
1634			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE</constant>&nbsp;</entry>
1635			<entry>boolean</entry>
1636		      </row>
1637		      <row><entry spanname="descr">Enable writing sample aspect ratio in the Video Usability Information.
1638	Applicable to the H264 encoder.</entry>
1639		      </row>
1640	
1641		      <row><entry></entry></row>
1642		      <row id="v4l2-mpeg-video-h264-vui-sar-idc">
1643			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC</constant>&nbsp;</entry>
1644			<entry>enum&nbsp;v4l2_mpeg_video_h264_vui_sar_idc</entry>
1645		      </row>
1646		      <row><entry spanname="descr">VUI sample aspect ratio indicator for H.264 encoding. The value
1647	is defined in the table E-1 in the standard. Applicable to the H264 encoder.</entry>
1648		      </row>
1649		      <row>
1650			<entrytbl spanname="descr" cols="2">
1651			  <tbody valign="top">
1652	
1653				<row>
1654				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_UNSPECIFIED</constant>&nbsp;</entry>
1655				  <entry>Unspecified</entry>
1656				</row>
1657				<row>
1658				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1</constant>&nbsp;</entry>
1659				  <entry>1x1</entry>
1660				</row>
1661				<row>
1662				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11</constant>&nbsp;</entry>
1663				  <entry>12x11</entry>
1664				</row>
1665				<row>
1666				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11</constant>&nbsp;</entry>
1667				  <entry>10x11</entry>
1668				</row>
1669				<row>
1670				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11</constant>&nbsp;</entry>
1671				  <entry>16x11</entry>
1672				</row>
1673				<row>
1674				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33</constant>&nbsp;</entry>
1675				  <entry>40x33</entry>
1676				</row>
1677				<row>
1678				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11</constant>&nbsp;</entry>
1679				  <entry>24x11</entry>
1680				</row>
1681				<row>
1682				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11</constant>&nbsp;</entry>
1683				  <entry>20x11</entry>
1684				</row>
1685				<row>
1686				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11</constant>&nbsp;</entry>
1687				  <entry>32x11</entry>
1688				</row>
1689				<row>
1690				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33</constant>&nbsp;</entry>
1691				  <entry>80x33</entry>
1692				</row>
1693				<row>
1694				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11</constant>&nbsp;</entry>
1695				  <entry>18x11</entry>
1696				</row>
1697				<row>
1698				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11</constant>&nbsp;</entry>
1699				  <entry>15x11</entry>
1700				</row>
1701				<row>
1702				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33</constant>&nbsp;</entry>
1703				  <entry>64x33</entry>
1704				</row>
1705				<row>
1706				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99</constant>&nbsp;</entry>
1707				  <entry>160x99</entry>
1708				</row>
1709				<row>
1710				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3</constant>&nbsp;</entry>
1711				  <entry>4x3</entry>
1712				</row>
1713				<row>
1714				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2</constant>&nbsp;</entry>
1715				  <entry>3x2</entry>
1716				</row>
1717				<row>
1718				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1</constant>&nbsp;</entry>
1719				  <entry>2x1</entry>
1720				</row>
1721				<row>
1722				  <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED</constant>&nbsp;</entry>
1723				  <entry>Extended SAR</entry>
1724				</row>
1725			  </tbody>
1726			</entrytbl>
1727		      </row>
1728	
1729		      <row><entry></entry></row>
1730		      <row>
1731			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH</constant>&nbsp;</entry>
1732			<entry>integer</entry>
1733		      </row>
1734		      <row><entry spanname="descr">Extended sample aspect ratio width for H.264 VUI encoding.
1735	Applicable to the H264 encoder.</entry>
1736		      </row>
1737	
1738		      <row><entry></entry></row>
1739		      <row>
1740			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT</constant>&nbsp;</entry>
1741			<entry>integer</entry>
1742		      </row>
1743		      <row><entry spanname="descr">Extended sample aspect ratio height for H.264 VUI encoding.
1744	Applicable to the H264 encoder.</entry>
1745		      </row>
1746	
1747		      <row><entry></entry></row>
1748		      <row id="v4l2-mpeg-video-h264-level">
1749			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LEVEL</constant>&nbsp;</entry>
1750			<entry>enum&nbsp;v4l2_mpeg_video_h264_level</entry>
1751		      </row>
1752		      <row><entry spanname="descr">The level information for the H264 video elementary stream.
1753	Applicable to the H264 encoder.
1754	Possible values are:</entry>
1755		      </row>
1756		      <row>
1757			<entrytbl spanname="descr" cols="2">
1758			  <tbody valign="top">
1759			    <row>
1760			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_0</constant>&nbsp;</entry>
1761			      <entry>Level 1.0</entry>
1762			    </row>
1763			    <row>
1764			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1B</constant>&nbsp;</entry>
1765			      <entry>Level 1B</entry>
1766			    </row>
1767			    <row>
1768			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_1</constant>&nbsp;</entry>
1769			      <entry>Level 1.1</entry>
1770			    </row>
1771			    <row>
1772			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_2</constant>&nbsp;</entry>
1773			      <entry>Level 1.2</entry>
1774			    </row>
1775			    <row>
1776			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_3</constant>&nbsp;</entry>
1777			      <entry>Level 1.3</entry>
1778			    </row>
1779			    <row>
1780			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_0</constant>&nbsp;</entry>
1781			      <entry>Level 2.0</entry>
1782			    </row>
1783			    <row>
1784			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_1</constant>&nbsp;</entry>
1785			      <entry>Level 2.1</entry>
1786			    </row>
1787			    <row>
1788			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_2</constant>&nbsp;</entry>
1789			      <entry>Level 2.2</entry>
1790			    </row>
1791			    <row>
1792			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_0</constant>&nbsp;</entry>
1793			      <entry>Level 3.0</entry>
1794			    </row>
1795			    <row>
1796			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_1</constant>&nbsp;</entry>
1797			      <entry>Level 3.1</entry>
1798			    </row>
1799			    <row>
1800			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_2</constant>&nbsp;</entry>
1801			      <entry>Level 3.2</entry>
1802			    </row>
1803			    <row>
1804			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_0</constant>&nbsp;</entry>
1805			      <entry>Level 4.0</entry>
1806			    </row>
1807			    <row>
1808			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_1</constant>&nbsp;</entry>
1809			      <entry>Level 4.1</entry>
1810			    </row>
1811			    <row>
1812			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_2</constant>&nbsp;</entry>
1813			      <entry>Level 4.2</entry>
1814			    </row>
1815			    <row>
1816			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_0</constant>&nbsp;</entry>
1817			      <entry>Level 5.0</entry>
1818			    </row>
1819			    <row>
1820			      <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_1</constant>&nbsp;</entry>
1821			      <entry>Level 5.1</entry>
1822			    </row>
1823			  </tbody>
1824			</entrytbl>
1825		      </row>
1826	
1827		      <row><entry></entry></row>
1828		      <row id="v4l2-mpeg-video-mpeg4-level">
1829			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL</constant>&nbsp;</entry>
1830			<entry>enum&nbsp;v4l2_mpeg_video_mpeg4_level</entry>
1831		      </row>
1832		      <row><entry spanname="descr">The level information for the MPEG4 elementary stream.
1833	Applicable to the MPEG4 encoder.
1834	Possible values are:</entry>
1835		      </row>
1836		      <row>
1837			<entrytbl spanname="descr" cols="2">
1838			  <tbody valign="top">
1839			    <row>
1840			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0</constant>&nbsp;</entry>
1841			      <entry>Level 0</entry>
1842			    </row>
1843			    <row>
1844			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0B</constant>&nbsp;</entry>
1845			      <entry>Level 0b</entry>
1846			    </row>
1847			    <row>
1848			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_1</constant>&nbsp;</entry>
1849			      <entry>Level 1</entry>
1850			    </row>
1851			    <row>
1852			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_2</constant>&nbsp;</entry>
1853			      <entry>Level 2</entry>
1854			    </row>
1855			    <row>
1856			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3</constant>&nbsp;</entry>
1857			      <entry>Level 3</entry>
1858			    </row>
1859			    <row>
1860			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3B</constant>&nbsp;</entry>
1861			      <entry>Level 3b</entry>
1862			    </row>
1863			    <row>
1864			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_4</constant>&nbsp;</entry>
1865			      <entry>Level 4</entry>
1866			    </row>
1867			    <row>
1868			      <entry><constant>V4L2_MPEG_VIDEO_LEVEL_5</constant>&nbsp;</entry>
1869			      <entry>Level 5</entry>
1870			    </row>
1871			  </tbody>
1872			</entrytbl>
1873		      </row>
1874	
1875		      <row><entry></entry></row>
1876		      <row id="v4l2-mpeg-video-h264-profile">
1877			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_PROFILE</constant>&nbsp;</entry>
1878			<entry>enum&nbsp;v4l2_mpeg_video_h264_profile</entry>
1879		      </row>
1880		      <row><entry spanname="descr">The profile information for H264.
1881	Applicable to the H264 encoder.
1882	Possible values are:</entry>
1883		      </row>
1884		      <row>
1885			<entrytbl spanname="descr" cols="2">
1886			  <tbody valign="top">
1887			    <row>
1888			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE</constant>&nbsp;</entry>
1889			      <entry>Baseline profile</entry>
1890			    </row>
1891			    <row>
1892			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE</constant>&nbsp;</entry>
1893			      <entry>Constrained Baseline profile</entry>
1894			    </row>
1895			    <row>
1896			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MAIN</constant>&nbsp;</entry>
1897			      <entry>Main profile</entry>
1898			    </row>
1899			    <row>
1900			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED</constant>&nbsp;</entry>
1901			      <entry>Extended profile</entry>
1902			    </row>
1903			    <row>
1904			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH</constant>&nbsp;</entry>
1905			      <entry>High profile</entry>
1906			    </row>
1907			    <row>
1908			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10</constant>&nbsp;</entry>
1909			      <entry>High 10 profile</entry>
1910			    </row>
1911			    <row>
1912			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422</constant>&nbsp;</entry>
1913			      <entry>High 422 profile</entry>
1914			    </row>
1915			    <row>
1916			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE</constant>&nbsp;</entry>
1917			      <entry>High 444 Predictive profile</entry>
1918			    </row>
1919			    <row>
1920			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA</constant>&nbsp;</entry>
1921			      <entry>High 10 Intra profile</entry>
1922			    </row>
1923			    <row>
1924			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA</constant>&nbsp;</entry>
1925			      <entry>High 422 Intra profile</entry>
1926			    </row>
1927			    <row>
1928			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA</constant>&nbsp;</entry>
1929			      <entry>High 444 Intra profile</entry>
1930			    </row>
1931			    <row>
1932			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA</constant>&nbsp;</entry>
1933			      <entry>CAVLC 444 Intra profile</entry>
1934			    </row>
1935			    <row>
1936			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE</constant>&nbsp;</entry>
1937			      <entry>Scalable Baseline profile</entry>
1938			    </row>
1939			    <row>
1940			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH</constant>&nbsp;</entry>
1941			      <entry>Scalable High profile</entry>
1942			    </row>
1943			    <row>
1944			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA</constant>&nbsp;</entry>
1945			      <entry>Scalable High Intra profile</entry>
1946			    </row>
1947			    <row>
1948			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH</constant>&nbsp;</entry>
1949			      <entry>Stereo High profile</entry>
1950			    </row>
1951			    <row>
1952			      <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH</constant>&nbsp;</entry>
1953			      <entry>Multiview High profile</entry>
1954			    </row>
1955	
1956			  </tbody>
1957			</entrytbl>
1958		      </row>
1959	
1960		      <row><entry></entry></row>
1961		      <row id="v4l2-mpeg-video-mpeg4-profile">
1962			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE</constant>&nbsp;</entry>
1963			<entry>enum&nbsp;v4l2_mpeg_video_mpeg4_profile</entry>
1964		      </row>
1965		      <row><entry spanname="descr">The profile information for MPEG4.
1966	Applicable to the MPEG4 encoder.
1967	Possible values are:</entry>
1968		      </row>
1969		      <row>
1970			<entrytbl spanname="descr" cols="2">
1971			  <tbody valign="top">
1972			    <row>
1973			      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE</constant>&nbsp;</entry>
1974			      <entry>Simple profile</entry>
1975			    </row>
1976			    <row>
1977			      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_SIMPLE</constant>&nbsp;</entry>
1978			      <entry>Advanced Simple profile</entry>
1979			    </row>
1980			    <row>
1981			      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_CORE</constant>&nbsp;</entry>
1982			      <entry>Core profile</entry>
1983			    </row>
1984			    <row>
1985			      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE_SCALABLE</constant>&nbsp;</entry>
1986			      <entry>Simple Scalable profile</entry>
1987			    </row>
1988			    <row>
1989			      <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY</constant>&nbsp;</entry>
1990			      <entry></entry>
1991			    </row>
1992			  </tbody>
1993			</entrytbl>
1994		      </row>
1995	
1996		      <row><entry></entry></row>
1997		      <row>
1998			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MAX_REF_PIC</constant>&nbsp;</entry>
1999			<entry>integer</entry>
2000		      </row>
2001		      <row><entry spanname="descr">The maximum number of reference pictures used for encoding.
2002	Applicable to the encoder.
2003	</entry>
2004		      </row>
2005	
2006		      <row><entry></entry></row>
2007		      <row id="v4l2-mpeg-video-multi-slice-mode">
2008			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant>&nbsp;</entry>
2009			<entry>enum&nbsp;v4l2_mpeg_video_multi_slice_mode</entry>
2010		      </row>
2011		      <row><entry spanname="descr">Determines how the encoder should handle division of frame into slices.
2012	Applicable to the encoder.
2013	Possible values are:</entry>
2014		      </row>
2015		      <row>
2016			<entrytbl spanname="descr" cols="2">
2017			  <tbody valign="top">
2018			    <row>
2019			      <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE</constant>&nbsp;</entry>
2020			      <entry>Single slice per frame.</entry>
2021			    </row>
2022			    <row>
2023			      <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>&nbsp;</entry>
2024			      <entry>Multiple slices with set maximum number of macroblocks per slice.</entry>
2025			    </row>
2026			    <row>
2027			      <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>&nbsp;</entry>
2028			      <entry>Multiple slice with set maximum size in bytes per slice.</entry>
2029			    </row>
2030			  </tbody>
2031			</entrytbl>
2032		      </row>
2033	
2034		      <row><entry></entry></row>
2035		      <row>
2036			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB</constant>&nbsp;</entry>
2037			<entry>integer</entry>
2038		      </row>
2039		      <row><entry spanname="descr">The maximum number of macroblocks in a slice. Used when
2040	<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>.
2041	Applicable to the encoder.</entry>
2042		      </row>
2043	
2044		      <row><entry></entry></row>
2045		      <row>
2046			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES</constant>&nbsp;</entry>
2047			<entry>integer</entry>
2048		      </row>
2049		      <row><entry spanname="descr">The maximum size of a slice in bytes. Used when
2050	<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>.
2051	Applicable to the encoder.</entry>
2052		      </row>
2053	
2054		      <row><entry></entry></row>
2055		      <row id="v4l2-mpeg-video-h264-loop-filter-mode">
2056			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE</constant>&nbsp;</entry>
2057			<entry>enum&nbsp;v4l2_mpeg_video_h264_loop_filter_mode</entry>
2058		      </row>
2059		      <row><entry spanname="descr">Loop filter mode for H264 encoder.
2060	Possible values are:</entry>
2061		      </row>
2062		      <row>
2063			<entrytbl spanname="descr" cols="2">
2064			  <tbody valign="top">
2065			    <row>
2066			      <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED</constant>&nbsp;</entry>
2067			      <entry>Loop filter is enabled.</entry>
2068			    </row>
2069			    <row>
2070			      <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED</constant>&nbsp;</entry>
2071			      <entry>Loop filter is disabled.</entry>
2072			    </row>
2073			    <row>
2074			      <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY</constant>&nbsp;</entry>
2075			      <entry>Loop filter is disabled at the slice boundary.</entry>
2076			    </row>
2077			  </tbody>
2078			</entrytbl>
2079		      </row>
2080	
2081		      <row><entry></entry></row>
2082		      <row>
2083			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA</constant>&nbsp;</entry>
2084			<entry>integer</entry>
2085		      </row>
2086		      <row><entry spanname="descr">Loop filter alpha coefficient, defined in the H264 standard.
2087	Applicable to the H264 encoder.</entry>
2088		      </row>
2089	
2090		      <row><entry></entry></row>
2091		      <row>
2092			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA</constant>&nbsp;</entry>
2093			<entry>integer</entry>
2094		      </row>
2095		      <row><entry spanname="descr">Loop filter beta coefficient, defined in the H264 standard.
2096	Applicable to the H264 encoder.</entry>
2097		      </row>
2098	
2099		      <row><entry></entry></row>
2100		      <row id="v4l2-mpeg-video-h264-entropy-mode">
2101			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE</constant>&nbsp;</entry>
2102			<entry>enum&nbsp;v4l2_mpeg_video_h264_entropy_mode</entry>
2103		      </row>
2104		      <row><entry spanname="descr">Entropy coding mode for H264 - CABAC/CAVALC.
2105	Applicable to the H264 encoder.
2106	Possible values are:</entry>
2107		      </row>
2108		      <row>
2109			<entrytbl spanname="descr" cols="2">
2110			  <tbody valign="top">
2111			    <row>
2112			      <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC</constant>&nbsp;</entry>
2113			      <entry>Use CAVLC entropy coding.</entry>
2114			    </row>
2115			    <row>
2116			      <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC</constant>&nbsp;</entry>
2117			      <entry>Use CABAC entropy coding.</entry>
2118			    </row>
2119			  </tbody>
2120			</entrytbl>
2121		      </row>
2122	
2123		      <row><entry></entry></row>
2124		      <row>
2125			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM</constant>&nbsp;</entry>
2126			<entry>boolean</entry>
2127		      </row>
2128		      <row><entry spanname="descr">Enable 8X8 transform for H264. Applicable to the H264 encoder.</entry>
2129		      </row>
2130	
2131		      <row><entry></entry></row>
2132		      <row>
2133			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB</constant>&nbsp;</entry>
2134			<entry>integer</entry>
2135		      </row>
2136		      <row><entry spanname="descr">Cyclic intra macroblock refresh. This is the number of continuous macroblocks
2137	refreshed every frame. Each frame a successive set of macroblocks is refreshed until the cycle completes and starts from the
2138	top of the frame. Applicable to H264, H263 and MPEG4 encoder.</entry>
2139		      </row>
2140	
2141		      <row><entry></entry></row>
2142		      <row>
2143			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE</constant>&nbsp;</entry>
2144			<entry>boolean</entry>
2145		      </row>
2146		      <row><entry spanname="descr">Frame level rate control enable.
2147	If this control is disabled then the quantization parameter for each frame type is constant and set with appropriate controls
2148	(e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>).
2149	If frame rate control is enabled then quantization parameter is adjusted to meet the chosen bitrate. Minimum and maximum value
2150	for the quantization parameter can be set with appropriate controls (e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>).
2151	Applicable to encoders.</entry>
2152		      </row>
2153	
2154		      <row><entry></entry></row>
2155		      <row>
2156			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>&nbsp;</entry>
2157			<entry>boolean</entry>
2158		      </row>
2159		      <row><entry spanname="descr">Macroblock level rate control enable.
2160	Applicable to the MPEG4 and H264 encoders.</entry>
2161		      </row>
2162	
2163		      <row><entry></entry></row>
2164		      <row>
2165			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_QPEL</constant>&nbsp;</entry>
2166			<entry>boolean</entry>
2167		      </row>
2168		      <row><entry spanname="descr">Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4 encoder.</entry>
2169		      </row>
2170	
2171		      <row><entry></entry></row>
2172		      <row>
2173			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>&nbsp;</entry>
2174			<entry>integer</entry>
2175		      </row>
2176		      <row><entry spanname="descr">Quantization parameter for an I frame for H263. Valid range: from 1 to 31.</entry>
2177		      </row>
2178	
2179		      <row><entry></entry></row>
2180		      <row>
2181			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>&nbsp;</entry>
2182			<entry>integer</entry>
2183		      </row>
2184		      <row><entry spanname="descr">Minimum quantization parameter for H263. Valid range: from 1 to 31.</entry>
2185		      </row>
2186	
2187		      <row><entry></entry></row>
2188		      <row>
2189			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MAX_QP</constant>&nbsp;</entry>
2190			<entry>integer</entry>
2191		      </row>
2192		      <row><entry spanname="descr">Maximum quantization parameter for H263. Valid range: from 1 to 31.</entry>
2193		      </row>
2194	
2195		      <row><entry></entry></row>
2196		      <row>
2197			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP</constant>&nbsp;</entry>
2198			<entry>integer</entry>
2199		      </row>
2200		      <row><entry spanname="descr">Quantization parameter for an P frame for H263. 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_H263_B_FRAME_QP</constant>&nbsp;</entry>
2206			<entry>integer</entry>
2207		      </row>
2208		      <row><entry spanname="descr">Quantization parameter for an B frame for H263. 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_H264_I_FRAME_QP</constant>&nbsp;</entry>
2214			<entry>integer</entry>
2215		      </row>
2216		      <row><entry spanname="descr">Quantization parameter for an I frame for H264. Valid range: from 0 to 51.</entry>
2217		      </row>
2218	
2219		      <row><entry></entry></row>
2220		      <row>
2221			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MIN_QP</constant>&nbsp;</entry>
2222			<entry>integer</entry>
2223		      </row>
2224		      <row><entry spanname="descr">Minimum quantization parameter for H264. Valid range: from 0 to 51.</entry>
2225		      </row>
2226	
2227		      <row><entry></entry></row>
2228		      <row>
2229			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MAX_QP</constant>&nbsp;</entry>
2230			<entry>integer</entry>
2231		      </row>
2232		      <row><entry spanname="descr">Maximum quantization parameter for H264. Valid range: from 0 to 51.</entry>
2233		      </row>
2234	
2235		      <row><entry></entry></row>
2236		      <row>
2237			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP</constant>&nbsp;</entry>
2238			<entry>integer</entry>
2239		      </row>
2240		      <row><entry spanname="descr">Quantization parameter for an P frame for H264. Valid range: from 0 to 51.</entry>
2241		      </row>
2242	
2243		      <row><entry></entry></row>
2244		      <row>
2245			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP</constant>&nbsp;</entry>
2246			<entry>integer</entry>
2247		      </row>
2248		      <row><entry spanname="descr">Quantization parameter for an B frame for H264. Valid range: from 0 to 51.</entry>
2249		      </row>
2250	
2251		      <row><entry></entry></row>
2252		      <row>
2253			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP</constant>&nbsp;</entry>
2254			<entry>integer</entry>
2255		      </row>
2256		      <row><entry spanname="descr">Quantization parameter for an I frame for MPEG4. Valid range: from 1 to 31.</entry>
2257		      </row>
2258	
2259		      <row><entry></entry></row>
2260		      <row>
2261			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP</constant>&nbsp;</entry>
2262			<entry>integer</entry>
2263		      </row>
2264		      <row><entry spanname="descr">Minimum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry>
2265		      </row>
2266	
2267		      <row><entry></entry></row>
2268		      <row>
2269			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP</constant>&nbsp;</entry>
2270			<entry>integer</entry>
2271		      </row>
2272		      <row><entry spanname="descr">Maximum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry>
2273		      </row>
2274	
2275		      <row><entry></entry></row>
2276		      <row>
2277			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP</constant>&nbsp;</entry>
2278			<entry>integer</entry>
2279		      </row>
2280		      <row><entry spanname="descr">Quantization parameter for an P frame for MPEG4. Valid range: from 1 to 31.</entry>
2281		      </row>
2282	
2283		      <row><entry></entry></row>
2284		      <row>
2285			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP</constant>&nbsp;</entry>
2286			<entry>integer</entry>
2287		      </row>
2288		      <row><entry spanname="descr">Quantization parameter for an B frame for MPEG4. Valid range: from 1 to 31.</entry>
2289		      </row>
2290	
2291		      <row><entry></entry></row>
2292		      <row>
2293			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_SIZE</constant>&nbsp;</entry>
2294			<entry>integer</entry>
2295		      </row>
2296		      <row><entry spanname="descr">The Video Buffer Verifier size in kilobytes, it is used as a limitation of frame skip.
2297	The VBV is defined in the standard as a mean to verify that the produced stream will be successfully decoded.
2298	The standard describes it as "Part of a hypothetical decoder that is conceptually connected to the
2299	output of the encoder. Its purpose is to provide a constraint on the variability of the data rate that an
2300	encoder or editing process may produce.".
2301	Applicable to the MPEG1, MPEG2, MPEG4 encoders.</entry>
2302		      </row>
2303	
2304		      <row><entry></entry></row>
2305		      <row id="v4l2-mpeg-video-vbv-delay">
2306			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_DELAY</constant>&nbsp;</entry>
2307			<entry>integer</entry>
2308		      </row><row><entry spanname="descr">Sets the initial delay in milliseconds for
2309	VBV buffer control.</entry>
2310		      </row>
2311	
2312			  <row><entry></entry></row>
2313		      <row id="v4l2-mpeg-video-hor-search-range">
2314			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE</constant>&nbsp;</entry>
2315			<entry>integer</entry>
2316		      </row>
2317			<row><entry spanname="descr">Horizontal search range defines maximum horizontal search area in pixels
2318	to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set
2319	horizontal search range for motion estimation module in video encoder.</entry>
2320		      </row>
2321	
2322			 <row><entry></entry></row>
2323		      <row id="v4l2-mpeg-video-vert-search-range">
2324			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE</constant>&nbsp;</entry>
2325			<entry>integer</entry>
2326		      </row>
2327			<row><entry spanname="descr">Vertical search range defines maximum vertical search area in pixels
2328	to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set
2329	vertical search range for motion estimation module in video encoder.</entry>
2330		      </row>
2331	
2332		      <row><entry></entry></row>
2333		      <row id="v4l2-mpeg-video-force-key-frame">
2334			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME</constant>&nbsp;</entry>
2335			<entry>button</entry>
2336		      </row><row><entry spanname="descr">Force a key frame for the next queued buffer. Applicable to encoders.
2337	This is a general, codec-agnostic keyframe control.</entry>
2338		      </row>
2339	
2340		      <row><entry></entry></row>
2341		      <row>
2342			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE</constant>&nbsp;</entry>
2343			<entry>integer</entry>
2344		      </row>
2345		      <row><entry spanname="descr">The Coded Picture Buffer size in kilobytes, it is used as a limitation of frame skip.
2346	The CPB is defined in the H264 standard as a mean to verify that the produced stream will be successfully decoded.
2347	Applicable to the H264 encoder.</entry>
2348		      </row>
2349	
2350		      <row><entry></entry></row>
2351		      <row>
2352			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_PERIOD</constant>&nbsp;</entry>
2353			<entry>integer</entry>
2354		      </row>
2355		      <row><entry spanname="descr">Period between I-frames in the open GOP for H264. In case of an open GOP
2356	this is the period between two I-frames. The period between IDR (Instantaneous Decoding Refresh) frames is taken from the GOP_SIZE control.
2357	An IDR frame, which stands for Instantaneous Decoding Refresh is an I-frame after which no prior frames are
2358	referenced. This means that a stream can be restarted from an IDR frame without the need to store or decode any
2359	previous frames. Applicable to the H264 encoder.</entry>
2360		      </row>
2361	
2362		      <row><entry></entry></row>
2363		      <row id="v4l2-mpeg-video-header-mode">
2364			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_HEADER_MODE</constant>&nbsp;</entry>
2365			<entry>enum&nbsp;v4l2_mpeg_video_header_mode</entry>
2366		      </row>
2367		      <row><entry spanname="descr">Determines whether the header is returned as the first buffer or is
2368	it returned together with the first frame. Applicable to encoders.
2369	Possible values are:</entry>
2370		      </row>
2371		      <row>
2372			<entrytbl spanname="descr" cols="2">
2373			  <tbody valign="top">
2374			    <row>
2375			      <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE</constant>&nbsp;</entry>
2376			      <entry>The stream header is returned separately in the first buffer.</entry>
2377			    </row>
2378			    <row>
2379			      <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME</constant>&nbsp;</entry>
2380			      <entry>The stream header is returned together with the first encoded frame.</entry>
2381			    </row>
2382			  </tbody>
2383			</entrytbl>
2384		      </row>
2385		      <row><entry></entry></row>
2386		      <row>
2387			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER</constant>&nbsp;</entry>
2388			<entry>boolean</entry>
2389		      </row><row><entry spanname="descr">Repeat the video sequence headers. Repeating these
2390	headers makes random access to the video stream easier. Applicable to the MPEG1, 2 and 4 encoder.</entry>
2391		      </row>
2392		      <row>
2393			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER</constant>&nbsp;</entry>
2394			<entry>boolean</entry>
2395		      </row><row><entry spanname="descr">Enabled the deblocking post processing filter for MPEG4 decoder.
2396	Applicable to the MPEG4 decoder.</entry>
2397		      </row>
2398		      <row><entry></entry></row>
2399		      <row>
2400			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_RES</constant>&nbsp;</entry>
2401			<entry>integer</entry>
2402		      </row><row><entry spanname="descr">vop_time_increment_resolution value for MPEG4. Applicable to the MPEG4 encoder.</entry>
2403		      </row>
2404		      <row><entry></entry></row>
2405		      <row>
2406			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_INC</constant>&nbsp;</entry>
2407			<entry>integer</entry>
2408		      </row><row><entry spanname="descr">vop_time_increment value for MPEG4. Applicable to the MPEG4 encoder.</entry>
2409		      </row>
2410	
2411		      <row><entry></entry></row>
2412		      <row>
2413			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING</constant>&nbsp;</entry>
2414			<entry>boolean</entry>
2415		      </row>
2416		      <row><entry spanname="descr">Enable generation of frame packing supplemental enhancement information in the encoded bitstream.
2417	The frame packing SEI message contains the arrangement of L and R planes for 3D viewing. Applicable to the H264 encoder.</entry>
2418		      </row>
2419	
2420		      <row><entry></entry></row>
2421		      <row>
2422			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0</constant>&nbsp;</entry>
2423			<entry>boolean</entry>
2424		      </row>
2425		      <row><entry spanname="descr">Sets current frame as frame0 in frame packing SEI.
2426	Applicable to the H264 encoder.</entry>
2427		      </row>
2428	
2429		      <row><entry></entry></row>
2430		      <row id="v4l2-mpeg-video-h264-sei-fp-arrangement-type">
2431			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE</constant>&nbsp;</entry>
2432			<entry>enum&nbsp;v4l2_mpeg_video_h264_sei_fp_arrangement_type</entry>
2433		      </row>
2434		      <row><entry spanname="descr">Frame packing arrangement type for H264 SEI.
2435	Applicable to the H264 encoder.
2436	Possible values are:</entry>
2437		      </row>
2438		      <row>
2439			<entrytbl spanname="descr" cols="2">
2440			  <tbody valign="top">
2441			    <row>
2442			      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD</constant>&nbsp;</entry>
2443			      <entry>Pixels are alternatively from L and R.</entry>
2444			    </row>
2445			    <row>
2446			      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN</constant>&nbsp;</entry>
2447			      <entry>L and R are interlaced by column.</entry>
2448			    </row>
2449			    <row>
2450			      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW</constant>&nbsp;</entry>
2451			      <entry>L and R are interlaced by row.</entry>
2452			    </row>
2453			    <row>
2454			      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE</constant>&nbsp;</entry>
2455			      <entry>L is on the left, R on the right.</entry>
2456			    </row>
2457			    <row>
2458			      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM</constant>&nbsp;</entry>
2459			      <entry>L is on top, R on bottom.</entry>
2460			    </row>
2461			    <row>
2462			      <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL</constant>&nbsp;</entry>
2463			      <entry>One view per frame.</entry>
2464			    </row>
2465			  </tbody>
2466			</entrytbl>
2467		      </row>
2468	
2469		      <row><entry></entry></row>
2470		      <row>
2471			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO</constant>&nbsp;</entry>
2472			<entry>boolean</entry>
2473		      </row>
2474		      <row><entry spanname="descr">Enables flexible macroblock ordering in the encoded bitstream. It is a technique
2475	used for restructuring the ordering of macroblocks in pictures. Applicable to the H264 encoder.</entry>
2476		      </row>
2477	
2478		      <row><entry></entry></row>
2479		      <row id="v4l2-mpeg-video-h264-fmo-map-type">
2480			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE</constant>&nbsp;</entry>
2481			<entry>enum&nbsp;v4l2_mpeg_video_h264_fmo_map_type</entry>
2482		      </row>
2483		      <row><entry spanname="descr">When using FMO, the map type divides the image in different scan patterns of macroblocks.
2484	Applicable to the H264 encoder.
2485	Possible values are:</entry>
2486		      </row>
2487		      <row>
2488			<entrytbl spanname="descr" cols="2">
2489			  <tbody valign="top">
2490			    <row>
2491			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES</constant>&nbsp;</entry>
2492			      <entry>Slices are interleaved one after other with macroblocks in run length order.</entry>
2493			    </row>
2494			    <row>
2495			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES</constant>&nbsp;</entry>
2496			      <entry>Scatters the macroblocks based on a mathematical function known to both encoder and decoder.</entry>
2497			    </row>
2498			    <row>
2499			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER</constant>&nbsp;</entry>
2500			      <entry>Macroblocks arranged in rectangular areas or regions of interest.</entry>
2501			    </row>
2502			    <row>
2503			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT</constant>&nbsp;</entry>
2504			      <entry>Slice groups grow in a cyclic way from centre to outwards.</entry>
2505			    </row>
2506			    <row>
2507			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN</constant>&nbsp;</entry>
2508			      <entry>Slice groups grow in raster scan pattern from left to right.</entry>
2509			    </row>
2510			    <row>
2511			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN</constant>&nbsp;</entry>
2512			      <entry>Slice groups grow in wipe scan pattern from top to bottom.</entry>
2513			    </row>
2514			    <row>
2515			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT</constant>&nbsp;</entry>
2516			      <entry>User defined map type.</entry>
2517			    </row>
2518			  </tbody>
2519			</entrytbl>
2520		      </row>
2521	
2522		      <row><entry></entry></row>
2523		      <row>
2524			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP</constant>&nbsp;</entry>
2525			<entry>integer</entry>
2526		      </row>
2527		      <row><entry spanname="descr">Number of slice groups in FMO.
2528	Applicable to the H264 encoder.</entry>
2529		      </row>
2530	
2531		      <row><entry></entry></row>
2532		      <row id="v4l2-mpeg-video-h264-fmo-change-direction">
2533			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION</constant>&nbsp;</entry>
2534			<entry>enum&nbsp;v4l2_mpeg_video_h264_fmo_change_dir</entry>
2535		      </row>
2536		      <row><entry spanname="descr">Specifies a direction of the slice group change for raster and wipe maps.
2537	Applicable to the H264 encoder.
2538	Possible values are:</entry>
2539		      </row>
2540		      <row>
2541			<entrytbl spanname="descr" cols="2">
2542			  <tbody valign="top">
2543			    <row>
2544			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT</constant>&nbsp;</entry>
2545			      <entry>Raster scan or wipe right.</entry>
2546			    </row>
2547			    <row>
2548			      <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT</constant>&nbsp;</entry>
2549			      <entry>Reverse raster scan or wipe left.</entry>
2550			    </row>
2551			  </tbody>
2552			</entrytbl>
2553		      </row>
2554	
2555		      <row><entry></entry></row>
2556		      <row>
2557			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE</constant>&nbsp;</entry>
2558			<entry>integer</entry>
2559		      </row>
2560		      <row><entry spanname="descr">Specifies the size of the first slice group for raster and wipe map.
2561	Applicable to the H264 encoder.</entry>
2562		      </row>
2563	
2564		      <row><entry></entry></row>
2565		      <row>
2566			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH</constant>&nbsp;</entry>
2567			<entry>integer</entry>
2568		      </row>
2569		      <row><entry spanname="descr">Specifies the number of consecutive macroblocks for the interleaved map.
2570	Applicable to the H264 encoder.</entry>
2571		      </row>
2572	
2573		      <row><entry></entry></row>
2574		      <row>
2575			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO</constant>&nbsp;</entry>
2576			<entry>boolean</entry>
2577		      </row>
2578		      <row><entry spanname="descr">Enables arbitrary slice ordering in encoded bitstream.
2579	Applicable to the H264 encoder.</entry>
2580		      </row>
2581	
2582		      <row><entry></entry></row>
2583		      <row>
2584			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER</constant>&nbsp;</entry>
2585			<entry>integer</entry>
2586		      </row><row><entry spanname="descr">Specifies the slice order in ASO. Applicable to the H264 encoder.
2587	The supplied 32-bit integer is interpreted as follows (bit
2588	0 = least significant bit):</entry>
2589		      </row>
2590		      <row>
2591			<entrytbl spanname="descr" cols="2">
2592			  <tbody valign="top">
2593			    <row>
2594			      <entry>Bit 0:15</entry>
2595			      <entry>Slice ID</entry>
2596			    </row>
2597			    <row>
2598			      <entry>Bit 16:32</entry>
2599			      <entry>Slice position or order</entry>
2600			    </row>
2601			  </tbody>
2602			</entrytbl>
2603		      </row>
2604	
2605		      <row><entry></entry></row>
2606		      <row>
2607			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING</constant>&nbsp;</entry>
2608			<entry>boolean</entry>
2609		      </row>
2610		      <row><entry spanname="descr">Enables H264 hierarchical coding.
2611	Applicable to the H264 encoder.</entry>
2612		      </row>
2613	
2614		      <row><entry></entry></row>
2615		      <row id="v4l2-mpeg-video-h264-hierarchical-coding-type">
2616			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE</constant>&nbsp;</entry>
2617			<entry>enum&nbsp;v4l2_mpeg_video_h264_hierarchical_coding_type</entry>
2618		      </row>
2619		      <row><entry spanname="descr">Specifies the hierarchical coding type.
2620	Applicable to the H264 encoder.
2621	Possible values are:</entry>
2622		      </row>
2623		      <row>
2624			<entrytbl spanname="descr" cols="2">
2625			  <tbody valign="top">
2626			    <row>
2627			      <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B</constant>&nbsp;</entry>
2628			      <entry>Hierarchical B coding.</entry>
2629			    </row>
2630			    <row>
2631			      <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P</constant>&nbsp;</entry>
2632			      <entry>Hierarchical P coding.</entry>
2633			    </row>
2634			  </tbody>
2635			</entrytbl>
2636		      </row>
2637	
2638		      <row><entry></entry></row>
2639		      <row>
2640			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER</constant>&nbsp;</entry>
2641			<entry>integer</entry>
2642		      </row>
2643		      <row><entry spanname="descr">Specifies the number of hierarchical coding layers.
2644	Applicable to the H264 encoder.</entry>
2645		      </row>
2646	
2647		      <row><entry></entry></row>
2648		      <row>
2649			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP</constant>&nbsp;</entry>
2650			<entry>integer</entry>
2651		      </row><row><entry spanname="descr">Specifies a user defined QP for each layer. Applicable to the H264 encoder.
2652	The supplied 32-bit integer is interpreted as follows (bit
2653	0 = least significant bit):</entry>
2654		      </row>
2655		      <row>
2656			<entrytbl spanname="descr" cols="2">
2657			  <tbody valign="top">
2658			    <row>
2659			      <entry>Bit 0:15</entry>
2660			      <entry>QP value</entry>
2661			    </row>
2662			    <row>
2663			      <entry>Bit 16:32</entry>
2664			      <entry>Layer number</entry>
2665			    </row>
2666			  </tbody>
2667			</entrytbl>
2668		      </row>
2669	
2670		    </tbody>
2671		  </tgroup>
2672		</table>
2673	      </section>
2674	
2675	      <section>
2676		<title>MFC 5.1 MPEG Controls</title>
2677	
2678		<para>The following MPEG class controls deal with MPEG
2679	decoding and encoding settings that are specific to the Multi Format Codec 5.1 device present
2680	in the S5P family of SoCs by Samsung.
2681	</para>
2682	
2683		<table pgwide="1" frame="none" id="mfc51-control-id">
2684		  <title>MFC 5.1 Control IDs</title>
2685		  <tgroup cols="4">
2686		    <colspec colname="c1" colwidth="1*" />
2687		    <colspec colname="c2" colwidth="6*" />
2688		    <colspec colname="c3" colwidth="2*" />
2689		    <colspec colname="c4" colwidth="6*" />
2690		    <spanspec namest="c1" nameend="c2" spanname="id" />
2691		    <spanspec namest="c2" nameend="c4" spanname="descr" />
2692		    <thead>
2693		      <row>
2694			<entry spanname="id" align="left">ID</entry>
2695			<entry align="left">Type</entry>
2696		      </row><row><entry spanname="descr" align="left">Description</entry>
2697		      </row>
2698		    </thead>
2699		    <tbody valign="top">
2700		      <row><entry></entry></row>
2701		      <row>
2702			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY_ENABLE</constant>&nbsp;</entry>
2703			<entry>boolean</entry>
2704		      </row><row><entry spanname="descr">If the display delay is enabled then the decoder is forced to return a
2705	CAPTURE buffer (decoded frame) after processing a certain number of OUTPUT buffers. The delay can be set through
2706	<constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant>. This feature can be used for example
2707	for generating thumbnails of videos. Applicable to the H264 decoder.
2708		      </entry>
2709		      </row>
2710		      <row><entry></entry></row>
2711		      <row>
2712			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant>&nbsp;</entry>
2713			<entry>integer</entry>
2714		      </row><row><entry spanname="descr">Display delay value for H264 decoder.
2715	The decoder is forced to return a decoded frame after the set 'display delay' number of frames. If this number is
2716	low it may result in frames returned out of dispaly order, in addition the hardware may still be using the returned buffer
2717	as a reference picture for subsequent frames.
2718	</entry>
2719		      </row>
2720		      <row><entry></entry></row>
2721		      <row>
2722			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P</constant>&nbsp;</entry>
2723			<entry>integer</entry>
2724		      </row><row><entry spanname="descr">The number of reference pictures used for encoding a P picture.
2725	Applicable to the H264 encoder.</entry>
2726		      </row>
2727		      <row><entry></entry></row>
2728		      <row>
2729			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING</constant>&nbsp;</entry>
2730			<entry>boolean</entry>
2731		      </row><row><entry spanname="descr">Padding enable in the encoder - use a color instead of repeating border pixels.
2732	Applicable to encoders.</entry>
2733		      </row>
2734		      <row><entry></entry></row>
2735		      <row>
2736			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING_YUV</constant>&nbsp;</entry>
2737			<entry>integer</entry>
2738		      </row><row><entry spanname="descr">Padding color in the encoder. Applicable to encoders. The supplied 32-bit integer is interpreted as follows (bit
2739	0 = least significant bit):</entry>
2740		      </row>
2741		      <row>
2742			<entrytbl spanname="descr" cols="2">
2743			  <tbody valign="top">
2744			    <row>
2745			      <entry>Bit 0:7</entry>
2746			      <entry>V chrominance information</entry>
2747			    </row>
2748			    <row>
2749			      <entry>Bit 8:15</entry>
2750			      <entry>U chrominance information</entry>
2751			    </row>
2752			    <row>
2753			      <entry>Bit 16:23</entry>
2754			      <entry>Y luminance information</entry>
2755			    </row>
2756			    <row>
2757			      <entry>Bit 24:31</entry>
2758			      <entry>Must be zero.</entry>
2759			    </row>
2760			  </tbody>
2761			</entrytbl>
2762		      </row>
2763		      <row><entry></entry></row>
2764		      <row>
2765			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_REACTION_COEFF</constant>&nbsp;</entry>
2766			<entry>integer</entry>
2767		      </row><row><entry spanname="descr">Reaction coefficient for MFC rate control. Applicable to encoders.
2768	<para>Note 1: Valid only when the frame level RC is enabled.</para>
2769	<para>Note 2: For tight CBR, this field must be small (ex. 2 ~ 10).
2770	For VBR, this field must be large (ex. 100 ~ 1000).</para>
2771	<para>Note 3: It is not recommended to use the greater number than FRAME_RATE * (10^9 / BIT_RATE).</para>
2772	</entry>
2773		      </row>
2774		      <row><entry></entry></row>
2775		      <row>
2776			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_DARK</constant>&nbsp;</entry>
2777			<entry>boolean</entry>
2778		      </row><row><entry spanname="descr">Adaptive rate control for dark region.
2779	Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
2780	Applicable to the H264 encoder.</entry>
2781		      </row>
2782		      <row><entry></entry></row>
2783		      <row>
2784			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_SMOOTH</constant>&nbsp;</entry>
2785			<entry>boolean</entry>
2786		      </row><row><entry spanname="descr">Adaptive rate control for smooth region.
2787	Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
2788	Applicable to the H264 encoder.</entry>
2789		      </row>
2790		      <row><entry></entry></row>
2791		      <row>
2792			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC</constant>&nbsp;</entry>
2793			<entry>boolean</entry>
2794		      </row><row><entry spanname="descr">Adaptive rate control for static region.
2795	Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
2796	Applicable to the H264 encoder.</entry>
2797		      </row>
2798		      <row><entry></entry></row>
2799		      <row>
2800			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_ACTIVITY</constant>&nbsp;</entry>
2801			<entry>boolean</entry>
2802		      </row><row><entry spanname="descr">Adaptive rate control for activity region.
2803	Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
2804	Applicable to the H264 encoder.</entry>
2805		      </row>
2806		      <row><entry></entry></row>
2807		      <row id="v4l2-mpeg-mfc51-video-frame-skip-mode">
2808			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE</constant>&nbsp;</entry>
2809			<entry>enum&nbsp;v4l2_mpeg_mfc51_video_frame_skip_mode</entry>
2810		      </row>
2811		      <row><entry spanname="descr">
2812	Indicates in what conditions the encoder should skip frames. If encoding a frame would cause the encoded stream to be larger then
2813	a chosen data limit then the frame will be skipped.
2814	Possible values are:</entry>
2815		      </row>
2816		      <row>
2817			<entrytbl spanname="descr" cols="2">
2818			  <tbody valign="top">
2819			    <row>
2820			      <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_DISABLED</constant>&nbsp;</entry>
2821			      <entry>Frame skip mode is disabled.</entry>
2822			    </row>
2823			    <row>
2824			      <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT</constant>&nbsp;</entry>
2825			      <entry>Frame skip mode enabled and buffer limit is set by the chosen level and is defined by the standard.</entry>
2826			    </row>
2827			    <row>
2828			      <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT</constant>&nbsp;</entry>
2829			      <entry>Frame skip mode enabled and buffer limit is set by the VBV (MPEG1/2/4) or CPB (H264) buffer size control.</entry>
2830			    </row>
2831			  </tbody>
2832			</entrytbl>
2833		      </row>
2834		      <row><entry></entry></row>
2835		      <row>
2836			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_FIXED_TARGET_BIT</constant>&nbsp;</entry>
2837			<entry>integer</entry>
2838		      </row><row><entry spanname="descr">Enable rate-control with fixed target bit.
2839	If this setting is enabled, then the rate control logic of the encoder will calculate the average bitrate
2840	for a GOP and keep it below or equal the set bitrate target. Otherwise the rate control logic calculates the
2841	overall average bitrate for the stream and keeps it below or equal to the set bitrate. In the first case
2842	the average bitrate for the whole stream will be smaller then the set bitrate. This is caused because the
2843	average is calculated for smaller number of frames, on the other hand enabling this setting will ensure that
2844	the stream will meet tight bandwidth constraints. Applicable to encoders.
2845	</entry>
2846		      </row>
2847		      <row><entry></entry></row>
2848		      <row id="v4l2-mpeg-mfc51-video-force-frame-type">
2849			<entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE</constant>&nbsp;</entry>
2850			<entry>enum&nbsp;v4l2_mpeg_mfc51_video_force_frame_type</entry>
2851		      </row>
2852		      <row><entry spanname="descr">Force a frame type for the next queued buffer. Applicable to encoders.
2853	Possible values are:</entry>
2854		      </row>
2855		      <row>
2856			<entrytbl spanname="descr" cols="2">
2857			  <tbody valign="top">
2858			    <row>
2859			      <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_DISABLED</constant>&nbsp;</entry>
2860			      <entry>Forcing a specific frame type disabled.</entry>
2861			    </row>
2862			    <row>
2863			      <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME</constant>&nbsp;</entry>
2864			      <entry>Force an I-frame.</entry>
2865			    </row>
2866			    <row>
2867			      <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED</constant>&nbsp;</entry>
2868			      <entry>Force a non-coded frame.</entry>
2869			    </row>
2870			  </tbody>
2871			</entrytbl>
2872		      </row>
2873		    </tbody>
2874		  </tgroup>
2875		</table>
2876	      </section>
2877	
2878	      <section>
2879		<title>CX2341x MPEG Controls</title>
2880	
2881		<para>The following MPEG class controls deal with MPEG
2882	encoding settings that are specific to the Conexant CX23415 and
2883	CX23416 MPEG encoding chips.</para>
2884	
2885		<table pgwide="1" frame="none" id="cx2341x-control-id">
2886		  <title>CX2341x Control IDs</title>
2887		  <tgroup cols="4">
2888		    <colspec colname="c1" colwidth="1*" />
2889		    <colspec colname="c2" colwidth="6*" />
2890		    <colspec colname="c3" colwidth="2*" />
2891		    <colspec colname="c4" colwidth="6*" />
2892		    <spanspec namest="c1" nameend="c2" spanname="id" />
2893		    <spanspec namest="c2" nameend="c4" spanname="descr" />
2894		    <thead>
2895		      <row>
2896			<entry spanname="id" align="left">ID</entry>
2897			<entry align="left">Type</entry>
2898		      </row><row><entry spanname="descr" align="left">Description</entry>
2899		      </row>
2900		    </thead>
2901		    <tbody valign="top">
2902		      <row><entry></entry></row>
2903		      <row id="v4l2-mpeg-cx2341x-video-spatial-filter-mode">
2904			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE</constant>&nbsp;</entry>
2905			<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_spatial_filter_mode</entry>
2906		      </row><row><entry spanname="descr">Sets the Spatial
2907	Filter mode (default <constant>MANUAL</constant>). Possible values
2908	are:</entry>
2909		      </row>
2910		      <row>
2911			<entrytbl spanname="descr" cols="2">
2912			  <tbody valign="top">
2913			    <row>
2914			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_MANUAL</constant>&nbsp;</entry>
2915			      <entry>Choose the filter manually</entry>
2916			    </row>
2917			    <row>
2918			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO</constant>&nbsp;</entry>
2919			      <entry>Choose the filter automatically</entry>
2920			    </row>
2921			  </tbody>
2922			</entrytbl>
2923		      </row>
2924		      <row><entry></entry></row>
2925		      <row>
2926			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER</constant>&nbsp;</entry>
2927			<entry>integer&nbsp;(0-15)</entry>
2928		      </row><row><entry spanname="descr">The setting for the
2929	Spatial Filter. 0 = off, 15 = maximum. (Default is 0.)</entry>
2930		      </row>
2931		      <row><entry></entry></row>
2932		      <row id="luma-spatial-filter-type">
2933			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE</constant>&nbsp;</entry>
2934			<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_luma_spatial_filter_type</entry>
2935		      </row><row><entry spanname="descr">Select the algorithm
2936	to use for the Luma Spatial Filter (default
2937	<constant>1D_HOR</constant>). Possible values:</entry>
2938		      </row>
2939		      <row>
2940			<entrytbl spanname="descr" cols="2">
2941			  <tbody valign="top">
2942			    <row>
2943			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_OFF</constant>&nbsp;</entry>
2944			      <entry>No filter</entry>
2945			    </row>
2946			    <row>
2947			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR</constant>&nbsp;</entry>
2948			      <entry>One-dimensional horizontal</entry>
2949			    </row>
2950			    <row>
2951			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT</constant>&nbsp;</entry>
2952			      <entry>One-dimensional vertical</entry>
2953			    </row>
2954			    <row>
2955			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE</constant>&nbsp;</entry>
2956			      <entry>Two-dimensional separable</entry>
2957			    </row>
2958			    <row>
2959			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE</constant>&nbsp;</entry>
2960			      <entry>Two-dimensional symmetrical
2961	non-separable</entry>
2962			    </row>
2963			  </tbody>
2964			</entrytbl>
2965		      </row>
2966		      <row><entry></entry></row>
2967		      <row id="chroma-spatial-filter-type">
2968			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE</constant>&nbsp;</entry>
2969			<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_chroma_spatial_filter_type</entry>
2970		      </row><row><entry spanname="descr">Select the algorithm
2971	for the Chroma Spatial Filter (default <constant>1D_HOR</constant>).
2972	Possible values are:</entry>
2973		      </row>
2974		      <row>
2975			<entrytbl spanname="descr" cols="2">
2976			  <tbody valign="top">
2977			    <row>
2978			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_OFF</constant>&nbsp;</entry>
2979			      <entry>No filter</entry>
2980			    </row>
2981			    <row>
2982			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR</constant>&nbsp;</entry>
2983			      <entry>One-dimensional horizontal</entry>
2984			    </row>
2985			  </tbody>
2986			</entrytbl>
2987		      </row>
2988		      <row><entry></entry></row>
2989		      <row id="v4l2-mpeg-cx2341x-video-temporal-filter-mode">
2990			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE</constant>&nbsp;</entry>
2991			<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_temporal_filter_mode</entry>
2992		      </row><row><entry spanname="descr">Sets the Temporal
2993	Filter mode (default <constant>MANUAL</constant>). Possible values
2994	are:</entry>
2995		      </row>
2996		      <row>
2997			<entrytbl spanname="descr" cols="2">
2998			  <tbody valign="top">
2999			    <row>
3000			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_MANUAL</constant>&nbsp;</entry>
3001			      <entry>Choose the filter manually</entry>
3002			    </row>
3003			    <row>
3004			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO</constant>&nbsp;</entry>
3005			      <entry>Choose the filter automatically</entry>
3006			    </row>
3007			  </tbody>
3008			</entrytbl>
3009		      </row>
3010		      <row><entry></entry></row>
3011		      <row>
3012			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER</constant>&nbsp;</entry>
3013			<entry>integer&nbsp;(0-31)</entry>
3014		      </row><row><entry spanname="descr">The setting for the
3015	Temporal Filter. 0 = off, 31 = maximum. (Default is 8 for full-scale
3016	capturing and 0 for scaled capturing.)</entry>
3017		      </row>
3018		      <row><entry></entry></row>
3019		      <row id="v4l2-mpeg-cx2341x-video-median-filter-type">
3020			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE</constant>&nbsp;</entry>
3021			<entry>enum&nbsp;v4l2_mpeg_cx2341x_video_median_filter_type</entry>
3022		      </row><row><entry spanname="descr">Median Filter Type
3023	(default <constant>OFF</constant>). Possible values are:</entry>
3024		      </row>
3025		      <row>
3026			<entrytbl spanname="descr" cols="2">
3027			  <tbody valign="top">
3028			    <row>
3029			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_OFF</constant>&nbsp;</entry>
3030			      <entry>No filter</entry>
3031			    </row>
3032			    <row>
3033			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR</constant>&nbsp;</entry>
3034			      <entry>Horizontal filter</entry>
3035			    </row>
3036			    <row>
3037			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT</constant>&nbsp;</entry>
3038			      <entry>Vertical filter</entry>
3039			    </row>
3040			    <row>
3041			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT</constant>&nbsp;</entry>
3042			      <entry>Horizontal and vertical filter</entry>
3043			    </row>
3044			    <row>
3045			      <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG</constant>&nbsp;</entry>
3046			      <entry>Diagonal filter</entry>
3047			    </row>
3048			  </tbody>
3049			</entrytbl>
3050		      </row>
3051		      <row><entry></entry></row>
3052		      <row>
3053			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_BOTTOM</constant>&nbsp;</entry>
3054			<entry>integer&nbsp;(0-255)</entry>
3055		      </row><row><entry spanname="descr">Threshold above which
3056	the luminance median filter is enabled (default 0)</entry>
3057		      </row>
3058		      <row><entry></entry></row>
3059		      <row>
3060			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_TOP</constant>&nbsp;</entry>
3061			<entry>integer&nbsp;(0-255)</entry>
3062		      </row><row><entry spanname="descr">Threshold below which
3063	the luminance median filter is enabled (default 255)</entry>
3064		      </row>
3065		      <row><entry></entry></row>
3066		      <row>
3067			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_BOTTOM</constant>&nbsp;</entry>
3068			<entry>integer&nbsp;(0-255)</entry>
3069		      </row><row><entry spanname="descr">Threshold above which
3070	the chroma median filter is enabled (default 0)</entry>
3071		      </row>
3072		      <row><entry></entry></row>
3073		      <row>
3074			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_TOP</constant>&nbsp;</entry>
3075			<entry>integer&nbsp;(0-255)</entry>
3076		      </row><row><entry spanname="descr">Threshold below which
3077	the chroma median filter is enabled (default 255)</entry>
3078		      </row>
3079		      <row><entry></entry></row>
3080		      <row>
3081			<entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_STREAM_INSERT_NAV_PACKETS</constant>&nbsp;</entry>
3082			<entry>boolean</entry>
3083		      </row>
3084		      <row><entry spanname="descr">The CX2341X MPEG encoder
3085	can insert one empty MPEG-2 PES packet into the stream between every
3086	four video frames. The packet size is 2048 bytes, including the
3087	packet_start_code_prefix and stream_id fields. The stream_id is 0xBF
3088	(private stream 2). The payload consists of 0x00 bytes, to be filled
3089	in by the application. 0 = do not insert, 1 = insert packets.</entry>
3090		      </row>
3091		    </tbody>
3092		  </tgroup>
3093		</table>
3094	      </section>
3095	
3096	    <section>
3097	      <title>VPX Control Reference</title>
3098	
3099	      <para>The VPX controls include controls for encoding parameters
3100	      of VPx video codec.</para>
3101	
3102	      <table pgwide="1" frame="none" id="vpx-control-id">
3103	      <title>VPX Control IDs</title>
3104	
3105	      <tgroup cols="4">
3106	        <colspec colname="c1" colwidth="1*" />
3107	        <colspec colname="c2" colwidth="6*" />
3108	        <colspec colname="c3" colwidth="2*" />
3109	        <colspec colname="c4" colwidth="6*" />
3110	        <spanspec namest="c1" nameend="c2" spanname="id" />
3111	        <spanspec namest="c2" nameend="c4" spanname="descr" />
3112	        <thead>
3113	          <row>
3114	            <entry spanname="id" align="left">ID</entry>
3115	            <entry align="left">Type</entry>
3116	          </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
3117	          </row>
3118	        </thead>
3119	        <tbody valign="top">
3120	          <row><entry></entry></row>
3121	
3122		      <row><entry></entry></row>
3123		      <row id="v4l2-vpx-num-partitions">
3124			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS</constant></entry>
3125			<entry>enum v4l2_vp8_num_partitions</entry>
3126		      </row>
3127		      <row><entry spanname="descr">The number of token partitions to use in VP8 encoder.
3128	Possible values are:</entry>
3129		      </row>
3130		      <row>
3131			<entrytbl spanname="descr" cols="2">
3132			  <tbody valign="top">
3133			    <row>
3134			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_1_PARTITION</constant></entry>
3135			      <entry>1 coefficient partition</entry>
3136			    </row>
3137			    <row>
3138			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_2_PARTITIONS</constant></entry>
3139			      <entry>2 coefficient partitions</entry>
3140			    </row>
3141			    <row>
3142			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_4_PARTITIONS</constant></entry>
3143			      <entry>4 coefficient partitions</entry>
3144			    </row>
3145			    <row>
3146			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_8_PARTITIONS</constant></entry>
3147			      <entry>8 coefficient partitions</entry>
3148		            </row>
3149	                  </tbody>
3150			</entrytbl>
3151		      </row>
3152	
3153		      <row><entry></entry></row>
3154		      <row>
3155			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4</constant></entry>
3156			<entry>boolean</entry>
3157		      </row>
3158		      <row><entry spanname="descr">Setting this prevents intra 4x4 mode in the intra mode decision.</entry>
3159		      </row>
3160	
3161		      <row><entry></entry></row>
3162		      <row id="v4l2-vpx-num-ref-frames">
3163			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES</constant></entry>
3164			<entry>enum v4l2_vp8_num_ref_frames</entry>
3165		      </row>
3166		      <row><entry spanname="descr">The number of reference pictures for encoding P frames.
3167	Possible values are:</entry>
3168		      </row>
3169		      <row>
3170			<entrytbl spanname="descr" cols="2">
3171			  <tbody valign="top">
3172			    <row>
3173			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_1_REF_FRAME</constant></entry>
3174			      <entry>Last encoded frame will be searched</entry>
3175			    </row>
3176			    <row>
3177			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_2_REF_FRAME</constant></entry>
3178			      <entry>Two frames will be searched among the last encoded frame, the golden frame
3179	and the alternate reference (altref) frame. The encoder implementation will decide which two are chosen.</entry>
3180			    </row>
3181			    <row>
3182			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_3_REF_FRAME</constant></entry>
3183			      <entry>The last encoded frame, the golden frame and the altref frame will be searched.</entry>
3184			    </row>
3185	                  </tbody>
3186			</entrytbl>
3187		      </row>
3188	
3189		      <row><entry></entry></row>
3190		      <row>
3191			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL</constant></entry>
3192			<entry>integer</entry>
3193		      </row>
3194		      <row><entry spanname="descr">Indicates the loop filter level. The adjustment of the loop
3195	filter level is done via a delta value against a baseline loop filter value.</entry>
3196		      </row>
3197	
3198		      <row><entry></entry></row>
3199		      <row>
3200			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS</constant></entry>
3201			<entry>integer</entry>
3202		      </row>
3203		      <row><entry spanname="descr">This parameter affects the loop filter. Anything above
3204	zero weakens the deblocking effect on the loop filter.</entry>
3205		      </row>
3206	
3207		      <row><entry></entry></row>
3208		      <row>
3209			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD</constant></entry>
3210			<entry>integer</entry>
3211		      </row>
3212		      <row><entry spanname="descr">Sets the refresh period for the golden frame. The period is defined
3213	in number of frames. For a value of 'n', every nth frame starting from the first key frame will be taken as a golden frame.
3214	For eg. for encoding sequence of 0, 1, 2, 3, 4, 5, 6, 7 where the golden frame refresh period is set as 4, the frames
3215	0, 4, 8 etc will be taken as the golden frames as frame 0 is always a key frame.</entry>
3216		      </row>
3217	
3218		      <row><entry></entry></row>
3219		      <row id="v4l2-vpx-golden-frame-sel">
3220			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL</constant></entry>
3221			<entry>enum v4l2_vp8_golden_frame_sel</entry>
3222		      </row>
3223		      <row><entry spanname="descr">Selects the golden frame for encoding.
3224	Possible values are:</entry>
3225		      </row>
3226		      <row>
3227			<entrytbl spanname="descr" cols="2">
3228			  <tbody valign="top">
3229			    <row>
3230			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_PREV</constant></entry>
3231			      <entry>Use the (n-2)th frame as a golden frame, current frame index being 'n'.</entry>
3232			    </row>
3233			    <row>
3234			      <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_REF_PERIOD</constant></entry>
3235			      <entry>Use the previous specific frame indicated by
3236	V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD as a golden frame.</entry>
3237			    </row>
3238	                  </tbody>
3239			</entrytbl>
3240		      </row>
3241	
3242		      <row><entry></entry></row>
3243		      <row>
3244			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_MIN_QP</constant></entry>
3245			<entry>integer</entry>
3246		      </row>
3247		      <row><entry spanname="descr">Minimum quantization parameter for VP8.</entry>
3248		      </row>
3249	
3250		      <row><entry></entry></row>
3251		      <row>
3252			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_MAX_QP</constant></entry>
3253			<entry>integer</entry>
3254		      </row>
3255		      <row><entry spanname="descr">Maximum quantization parameter for VP8.</entry>
3256		      </row>
3257	
3258		      <row><entry></entry></row>
3259		      <row>
3260			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP</constant>&nbsp;</entry>
3261			<entry>integer</entry>
3262		      </row>
3263		      <row><entry spanname="descr">Quantization parameter for an I frame for VP8.</entry>
3264		      </row>
3265	
3266		      <row><entry></entry></row>
3267		      <row>
3268			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP</constant>&nbsp;</entry>
3269			<entry>integer</entry>
3270		      </row>
3271		      <row><entry spanname="descr">Quantization parameter for a P frame for VP8.</entry>
3272		      </row>
3273	
3274		      <row><entry></entry></row>
3275		      <row>
3276			<entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_PROFILE</constant>&nbsp;</entry>
3277			<entry>integer</entry>
3278		      </row>
3279		      <row><entry spanname="descr">Select the desired profile for VPx encoder.
3280	Acceptable values are 0, 1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3.</entry>
3281		      </row>
3282	
3283	          <row><entry></entry></row>
3284	        </tbody>
3285	      </tgroup>
3286	      </table>
3287	
3288	      </section>
3289	    </section>
3290	
3291	    <section id="camera-controls">
3292	      <title>Camera Control Reference</title>
3293	
3294	      <para>The Camera class includes controls for mechanical (or
3295	equivalent digital) features of a device such as controllable lenses
3296	or sensors.</para>
3297	
3298	    <table pgwide="1" frame="none" id="camera-control-id">
3299	      <title>Camera Control IDs</title>
3300	      <tgroup cols="4">
3301		<colspec colname="c1" colwidth="1*" />
3302		<colspec colname="c2" colwidth="6*" />
3303		<colspec colname="c3" colwidth="2*" />
3304		<colspec colname="c4" colwidth="6*" />
3305		<spanspec namest="c1" nameend="c2" spanname="id" />
3306		<spanspec namest="c2" nameend="c4" spanname="descr" />
3307		<thead>
3308		  <row>
3309		    <entry spanname="id" align="left">ID</entry>
3310		    <entry align="left">Type</entry>
3311		  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
3312		  </row>
3313		</thead>
3314		<tbody valign="top">
3315		  <row><entry></entry></row>
3316		  <row>
3317		    <entry spanname="id"><constant>V4L2_CID_CAMERA_CLASS</constant>&nbsp;</entry>
3318		    <entry>class</entry>
3319		  </row><row><entry spanname="descr">The Camera class
3320	descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
3321	description of this control class.</entry>
3322		  </row>
3323		  <row><entry></entry></row>
3324	
3325		  <row id="v4l2-exposure-auto-type">
3326		    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO</constant>&nbsp;</entry>
3327		    <entry>enum&nbsp;v4l2_exposure_auto_type</entry>
3328		  </row><row><entry spanname="descr">Enables automatic
3329	adjustments of the exposure time and/or iris aperture. The effect of
3330	manual changes of the exposure time or iris aperture while these
3331	features are enabled is undefined, drivers should ignore such
3332	requests. Possible values are:</entry>
3333		  </row>
3334		  <row>
3335		    <entrytbl spanname="descr" cols="2">
3336		      <tbody valign="top">
3337			<row>
3338			  <entry><constant>V4L2_EXPOSURE_AUTO</constant>&nbsp;</entry>
3339			      <entry>Automatic exposure time, automatic iris
3340	aperture.</entry>
3341			</row>
3342			<row>
3343			  <entry><constant>V4L2_EXPOSURE_MANUAL</constant>&nbsp;</entry>
3344			  <entry>Manual exposure time, manual iris.</entry>
3345			</row>
3346			<row>
3347			  <entry><constant>V4L2_EXPOSURE_SHUTTER_PRIORITY</constant>&nbsp;</entry>
3348			  <entry>Manual exposure time, auto iris.</entry>
3349			</row>
3350			<row>
3351			  <entry><constant>V4L2_EXPOSURE_APERTURE_PRIORITY</constant>&nbsp;</entry>
3352			  <entry>Auto exposure time, manual iris.</entry>
3353			</row>
3354		      </tbody>
3355		    </entrytbl>
3356		  </row>
3357		  <row><entry></entry></row>
3358	
3359		  <row>
3360		    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_ABSOLUTE</constant>&nbsp;</entry>
3361		    <entry>integer</entry>
3362		  </row><row><entry spanname="descr">Determines the exposure
3363	time of the camera sensor. The exposure time is limited by the frame
3364	interval. Drivers should interpret the values as 100 &micro;s units,
3365	where the value 1 stands for 1/10000th of a second, 10000 for 1 second
3366	and 100000 for 10 seconds.</entry>
3367		  </row>
3368		  <row><entry></entry></row>
3369	
3370		  <row>
3371		    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO_PRIORITY</constant>&nbsp;</entry>
3372		    <entry>boolean</entry>
3373		  </row><row><entry spanname="descr">When
3374	<constant>V4L2_CID_EXPOSURE_AUTO</constant> is set to
3375	<constant>AUTO</constant> or <constant>APERTURE_PRIORITY</constant>,
3376	this control determines if the device may dynamically vary the frame
3377	rate. By default this feature is disabled (0) and the frame rate must
3378	remain constant.</entry>
3379		  </row>
3380		  <row><entry></entry></row>
3381	
3382		  <row>
3383		    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant>&nbsp;</entry>
3384		    <entry>integer menu</entry>
3385		  </row><row><entry spanname="descr"> Determines the automatic
3386	exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant>
3387	control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant>
3388	or <constant>APERTURE_PRIORITY</constant>.
3389	It is expressed in terms of EV, drivers should interpret the values as 0.001 EV
3390	units, where the value 1000 stands for +1 EV.
3391	<para>Increasing the exposure compensation value is equivalent to decreasing
3392	the exposure value (EV) and will increase the amount of light at the image
3393	sensor. The camera performs the exposure compensation by adjusting absolute
3394	exposure time and/or aperture.</para></entry>
3395		  </row>
3396		  <row><entry></entry></row>
3397	
3398		  <row id="v4l2-exposure-metering">
3399		    <entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant>&nbsp;</entry>
3400		    <entry>enum&nbsp;v4l2_exposure_metering</entry>
3401		  </row><row><entry spanname="descr">Determines how the camera measures
3402	the amount of light available for the frame exposure. Possible values are:</entry>
3403		  </row>
3404		  <row>
3405		    <entrytbl spanname="descr" cols="2">
3406		      <tbody valign="top">
3407			<row>
3408			  <entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant>&nbsp;</entry>
3409			  <entry>Use the light information coming from the entire frame
3410	and average giving no weighting to any particular portion of the metered area.
3411			  </entry>
3412			</row>
3413			<row>
3414			  <entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant>&nbsp;</entry>
3415			  <entry>Average the light information coming from the entire frame
3416	giving priority to the center of the metered area.</entry>
3417			</row>
3418			<row>
3419			  <entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant>&nbsp;</entry>
3420			  <entry>Measure only very small area at the center of the frame.</entry>
3421			</row>
3422			<row>
3423			  <entry><constant>V4L2_EXPOSURE_METERING_MATRIX</constant>&nbsp;</entry>
3424			  <entry>A multi-zone metering. The light intensity is measured
3425	in several points of the frame and the results are combined. The
3426	algorithm of the zones selection and their significance in calculating the
3427	final value is device dependent.</entry>
3428			</row>
3429		      </tbody>
3430		    </entrytbl>
3431		  </row>
3432		  <row><entry></entry></row>
3433	
3434		  <row>
3435		    <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant>&nbsp;</entry>
3436		    <entry>integer</entry>
3437		  </row><row><entry spanname="descr">This control turns the
3438	camera horizontally by the specified amount. The unit is undefined. A
3439	positive value moves the camera to the right (clockwise when viewed
3440	from above), a negative value to the left. A value of zero does not
3441	cause motion. This is a write-only control.</entry>
3442		  </row>
3443		  <row><entry></entry></row>
3444	
3445		  <row>
3446		    <entry spanname="id"><constant>V4L2_CID_TILT_RELATIVE</constant>&nbsp;</entry>
3447		    <entry>integer</entry>
3448		  </row><row><entry spanname="descr">This control turns the
3449	camera vertically by the specified amount. The unit is undefined. A
3450	positive value moves the camera up, a negative value down. A value of
3451	zero does not cause motion. This is a write-only control.</entry>
3452		  </row>
3453		  <row><entry></entry></row>
3454	
3455		  <row>
3456		    <entry spanname="id"><constant>V4L2_CID_PAN_RESET</constant>&nbsp;</entry>
3457		    <entry>button</entry>
3458		  </row><row><entry spanname="descr">When this control is set,
3459	the camera moves horizontally to the default position.</entry>
3460		  </row>
3461		  <row><entry></entry></row>
3462	
3463		  <row>
3464		    <entry spanname="id"><constant>V4L2_CID_TILT_RESET</constant>&nbsp;</entry>
3465		    <entry>button</entry>
3466		  </row><row><entry spanname="descr">When this control is set,
3467	the camera moves vertically to the default position.</entry>
3468		  </row>
3469		  <row><entry></entry></row>
3470	
3471		  <row>
3472		    <entry spanname="id"><constant>V4L2_CID_PAN_ABSOLUTE</constant>&nbsp;</entry>
3473		    <entry>integer</entry>
3474		  </row><row><entry spanname="descr">This control
3475	turns the camera horizontally to the specified position. Positive
3476	values move the camera to the right (clockwise when viewed from above),
3477	negative values to the left. Drivers should interpret the values as arc
3478	seconds, with valid values between -180 * 3600 and +180 * 3600
3479	inclusive.</entry>
3480		  </row>
3481		  <row><entry></entry></row>
3482	
3483		  <row>
3484		    <entry spanname="id"><constant>V4L2_CID_TILT_ABSOLUTE</constant>&nbsp;</entry>
3485		    <entry>integer</entry>
3486		  </row><row><entry spanname="descr">This control
3487	turns the camera vertically to the specified position. Positive values
3488	move the camera up, negative values down. Drivers should interpret the
3489	values as arc seconds, with valid values between -180 * 3600 and +180
3490	* 3600 inclusive.</entry>
3491		  </row>
3492		  <row><entry></entry></row>
3493	
3494		  <row>
3495		    <entry spanname="id"><constant>V4L2_CID_FOCUS_ABSOLUTE</constant>&nbsp;</entry>
3496		    <entry>integer</entry>
3497		  </row><row><entry spanname="descr">This control sets the
3498	focal point of the camera to the specified position. The unit is
3499	undefined. Positive values set the focus closer to the camera,
3500	negative values towards infinity.</entry>
3501		  </row>
3502		  <row><entry></entry></row>
3503	
3504		  <row>
3505		    <entry spanname="id"><constant>V4L2_CID_FOCUS_RELATIVE</constant>&nbsp;</entry>
3506		    <entry>integer</entry>
3507		  </row><row><entry spanname="descr">This control moves the
3508	focal point of the camera by the specified amount. The unit is
3509	undefined. Positive values move the focus closer to the camera,
3510	negative values towards infinity. This is a write-only control.</entry>
3511		  </row>
3512		  <row><entry></entry></row>
3513	
3514		  <row>
3515		    <entry spanname="id"><constant>V4L2_CID_FOCUS_AUTO</constant>&nbsp;</entry>
3516		    <entry>boolean</entry>
3517		  </row><row><entry spanname="descr">Enables continuous automatic
3518	focus adjustments. The effect of manual focus adjustments while this feature
3519	is enabled is undefined, drivers should ignore such requests.</entry>
3520		  </row>
3521		  <row><entry></entry></row>
3522	
3523		  <row>
3524		    <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_START</constant>&nbsp;</entry>
3525		    <entry>button</entry>
3526		  </row><row><entry spanname="descr">Starts single auto focus process.
3527	The effect of setting this control when <constant>V4L2_CID_FOCUS_AUTO</constant>
3528	is set to <constant>TRUE</constant> (1) is undefined, drivers should ignore
3529	such requests.</entry>
3530		  </row>
3531		  <row><entry></entry></row>
3532	
3533		  <row>
3534		    <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_STOP</constant>&nbsp;</entry>
3535		    <entry>button</entry>
3536		  </row><row><entry spanname="descr">Aborts automatic focusing
3537	started with <constant>V4L2_CID_AUTO_FOCUS_START</constant> control. It is
3538	effective only when the continuous autofocus is disabled, that is when
3539	<constant>V4L2_CID_FOCUS_AUTO</constant> control is set to <constant>FALSE
3540	</constant> (0).</entry>
3541		  </row>
3542		  <row><entry></entry></row>
3543	
3544		  <row id="v4l2-auto-focus-status">
3545		    <entry spanname="id">
3546		      <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant>&nbsp;</entry>
3547		    <entry>bitmask</entry>
3548		  </row>
3549		  <row><entry spanname="descr">The automatic focus status. This is a read-only
3550		  control.</entry>
3551		  </row>
3552		  <row>
3553		    <entrytbl spanname="descr" cols="2">
3554		      <tbody valign="top">
3555			<row>
3556			  <entry><constant>V4L2_AUTO_FOCUS_STATUS_IDLE</constant>&nbsp;</entry>
3557			  <entry>Automatic focus is not active.</entry>
3558			</row>
3559			<row>
3560			  <entry><constant>V4L2_AUTO_FOCUS_STATUS_BUSY</constant>&nbsp;</entry>
3561			  <entry>Automatic focusing is in progress.</entry>
3562			</row>
3563			<row>
3564			  <entry><constant>V4L2_AUTO_FOCUS_STATUS_REACHED</constant>&nbsp;</entry>
3565			  <entry>Focus has been reached.</entry>
3566			</row>
3567			<row>
3568			  <entry><constant>V4L2_AUTO_FOCUS_STATUS_FAILED</constant>&nbsp;</entry>
3569			  <entry>Automatic focus has failed, the driver will not
3570			  transition from this state until another action is
3571			  performed by an application.</entry>
3572			</row>
3573		      </tbody>
3574		    </entrytbl>
3575		  </row>
3576		  <row><entry spanname="descr">
3577	Setting <constant>V4L2_LOCK_FOCUS</constant> lock bit of the <constant>V4L2_CID_3A_LOCK
3578	</constant> control may stop updates of the <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant>
3579	control value.</entry>
3580		  </row>
3581		  <row><entry></entry></row>
3582	
3583		  <row id="v4l2-auto-focus-range">
3584		    <entry spanname="id">
3585		      <constant>V4L2_CID_AUTO_FOCUS_RANGE</constant>&nbsp;</entry>
3586		    <entry>enum&nbsp;v4l2_auto_focus_range</entry>
3587		  </row>
3588		  <row><entry spanname="descr">Determines auto focus distance range
3589	for which lens may be adjusted. </entry>
3590		  </row>
3591		  <row>
3592		    <entrytbl spanname="descr" cols="2">
3593		      <tbody valign="top">
3594			<row>
3595			  <entry><constant>V4L2_AUTO_FOCUS_RANGE_AUTO</constant>&nbsp;</entry>
3596			  <entry>The camera automatically selects the focus range.</entry>
3597			</row>
3598			<row>
3599			  <entry><constant>V4L2_AUTO_FOCUS_RANGE_NORMAL</constant>&nbsp;</entry>
3600			  <entry>Normal distance range, limited for best automatic focus
3601	performance.</entry>
3602			</row>
3603			<row>
3604			  <entry><constant>V4L2_AUTO_FOCUS_RANGE_MACRO</constant>&nbsp;</entry>
3605			  <entry>Macro (close-up) auto focus. The camera will
3606	use its minimum possible distance for auto focus.</entry>
3607			</row>
3608			<row>
3609			  <entry><constant>V4L2_AUTO_FOCUS_RANGE_INFINITY</constant>&nbsp;</entry>
3610			  <entry>The lens is set to focus on an object at infinite distance.</entry>
3611			</row>
3612		      </tbody>
3613		    </entrytbl>
3614		  </row>
3615		  <row><entry></entry></row>
3616	
3617		  <row>
3618		    <entry spanname="id"><constant>V4L2_CID_ZOOM_ABSOLUTE</constant>&nbsp;</entry>
3619		    <entry>integer</entry>
3620		  </row><row><entry spanname="descr">Specify the objective lens
3621	focal length as an absolute value. The zoom unit is driver-specific and its
3622	value should be a positive integer.</entry>
3623		  </row>
3624		  <row><entry></entry></row>
3625	
3626		  <row>
3627		    <entry spanname="id"><constant>V4L2_CID_ZOOM_RELATIVE</constant>&nbsp;</entry>
3628		    <entry>integer</entry>
3629		  </row><row><entry spanname="descr">Specify the objective lens
3630	focal length relatively to the current value. Positive values move the zoom
3631	lens group towards the telephoto direction, negative values towards the
3632	wide-angle direction. The zoom unit is driver-specific. This is a write-only control.</entry>
3633		  </row>
3634		  <row><entry></entry></row>
3635	
3636		  <row>
3637		    <entry spanname="id"><constant>V4L2_CID_ZOOM_CONTINUOUS</constant>&nbsp;</entry>
3638		    <entry>integer</entry>
3639		  </row><row><entry spanname="descr">Move the objective lens group
3640	at the specified speed until it reaches physical device limits or until an
3641	explicit request to stop the movement. A positive value moves the zoom lens
3642	group towards the telephoto direction. A value of zero stops the zoom lens
3643	group movement. A negative value moves the zoom lens group towards the
3644	wide-angle direction. The zoom speed unit is driver-specific.</entry>
3645		  </row>
3646		  <row><entry></entry></row>
3647	
3648		  <row>
3649		    <entry spanname="id"><constant>V4L2_CID_IRIS_ABSOLUTE</constant>&nbsp;</entry>
3650		    <entry>integer</entry>
3651		  </row><row><entry spanname="descr">This control sets the
3652	camera's aperture to the specified value. The unit is undefined.
3653	Larger values open the iris wider, smaller values close it.</entry>
3654		  </row>
3655		  <row><entry></entry></row>
3656	
3657		  <row>
3658		    <entry spanname="id"><constant>V4L2_CID_IRIS_RELATIVE</constant>&nbsp;</entry>
3659		    <entry>integer</entry>
3660		  </row><row><entry spanname="descr">This control modifies the
3661	camera's aperture by the specified amount. The unit is undefined.
3662	Positive values open the iris one step further, negative values close
3663	it one step further. This is a write-only control.</entry>
3664		  </row>
3665		  <row><entry></entry></row>
3666	
3667		  <row>
3668		    <entry spanname="id"><constant>V4L2_CID_PRIVACY</constant>&nbsp;</entry>
3669		    <entry>boolean</entry>
3670		  </row><row><entry spanname="descr">Prevent video from being acquired
3671	by the camera. When this control is set to <constant>TRUE</constant> (1), no
3672	image can be captured by the camera. Common means to enforce privacy are
3673	mechanical obturation of the sensor and firmware image processing, but the
3674	device is not restricted to these methods. Devices that implement the privacy
3675	control must support read access and may support write access.</entry>
3676		  </row>
3677	
3678		  <row>
3679		    <entry spanname="id"><constant>V4L2_CID_BAND_STOP_FILTER</constant>&nbsp;</entry>
3680		    <entry>integer</entry>
3681		  </row><row><entry spanname="descr">Switch the band-stop filter of a
3682	camera sensor on or off, or specify its strength. Such band-stop filters can
3683	be used, for example, to filter out the fluorescent light component.</entry>
3684		  </row>
3685		  <row><entry></entry></row>
3686	
3687		  <row id="v4l2-auto-n-preset-white-balance">
3688		    <entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant>&nbsp;</entry>
3689		    <entry>enum&nbsp;v4l2_auto_n_preset_white_balance</entry>
3690		  </row><row><entry spanname="descr">Sets white balance to automatic,
3691	manual or a preset. The presets determine color temperature of the light as
3692	a hint to the camera for white balance adjustments resulting in most accurate
3693	color representation. The following white balance presets are listed in order
3694	of increasing color temperature.</entry>
3695		  </row>
3696		  <row>
3697		    <entrytbl spanname="descr" cols="2">
3698		      <tbody valign="top">
3699			<row>
3700			  <entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant>&nbsp;</entry>
3701			  <entry>Manual white balance.</entry>
3702			</row>
3703			<row>
3704			  <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant>&nbsp;</entry>
3705			  <entry>Automatic white balance adjustments.</entry>
3706			</row>
3707			<row>
3708			  <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant>&nbsp;</entry>
3709			  <entry>White balance setting for incandescent (tungsten) lighting.
3710	It generally cools down the colors and corresponds approximately to 2500...3500 K
3711	color temperature range.</entry>
3712			</row>
3713			<row>
3714			  <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant>&nbsp;</entry>
3715			  <entry>White balance preset for fluorescent lighting.
3716	It corresponds approximately to 4000...5000 K color temperature.</entry>
3717			</row>
3718			<row>
3719			  <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant>&nbsp;</entry>
3720			  <entry>With this setting the camera will compensate for
3721	fluorescent H lighting.</entry>
3722			</row>
3723			<row>
3724			  <entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant>&nbsp;</entry>
3725			  <entry>White balance setting for horizon daylight.
3726	It corresponds approximately to 5000 K color temperature.</entry>
3727			</row>
3728			<row>
3729			  <entry><constant>V4L2_WHITE_BALANCE_DAYLIGHT</constant>&nbsp;</entry>
3730			  <entry>White balance preset for daylight (with clear sky).
3731	It corresponds approximately to 5000...6500 K color temperature.</entry>
3732			</row>
3733			<row>
3734			  <entry><constant>V4L2_WHITE_BALANCE_FLASH</constant>&nbsp;</entry>
3735			  <entry>With this setting the camera will compensate for the flash
3736	light. It slightly warms up the colors and corresponds roughly to 5000...5500 K
3737	color temperature.</entry>
3738			</row>
3739			<row>
3740			  <entry><constant>V4L2_WHITE_BALANCE_CLOUDY</constant>&nbsp;</entry>
3741			  <entry>White balance preset for moderately overcast sky.
3742	This option corresponds approximately to 6500...8000 K color temperature
3743	range.</entry>
3744			</row>
3745			<row>
3746			  <entry><constant>V4L2_WHITE_BALANCE_SHADE</constant>&nbsp;</entry>
3747			  <entry>White balance preset for shade or heavily overcast
3748	sky. It corresponds approximately to 9000...10000 K color temperature.
3749	</entry>
3750			</row>
3751		      </tbody>
3752		    </entrytbl>
3753		  </row>
3754		  <row><entry></entry></row>
3755	
3756		  <row id="v4l2-wide-dynamic-range">
3757		    <entry spanname="id"><constant>V4L2_CID_WIDE_DYNAMIC_RANGE</constant></entry>
3758		    <entry>boolean</entry>
3759		  </row>
3760		  <row>
3761		    <entry spanname="descr">Enables or disables the camera's wide dynamic
3762	range feature. This feature allows to obtain clear images in situations where
3763	intensity of the illumination varies significantly throughout the scene, i.e.
3764	there are simultaneously very dark and very bright areas. It is most commonly
3765	realized in cameras by combining two subsequent frames with different exposure
3766	times. <footnote id="ctypeconv"><para> This control may be changed to a menu
3767	control in the future, if more options are required.</para></footnote></entry>
3768		  </row>
3769		  <row><entry></entry></row>
3770	
3771		  <row id="v4l2-image-stabilization">
3772		    <entry spanname="id"><constant>V4L2_CID_IMAGE_STABILIZATION</constant></entry>
3773		    <entry>boolean</entry>
3774		  </row>
3775		  <row>
3776		    <entry spanname="descr">Enables or disables image stabilization.
3777		      <footnoteref linkend="ctypeconv"/></entry>
3778		  </row>
3779		  <row><entry></entry></row>
3780	
3781		  <row>
3782		    <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY</constant>&nbsp;</entry>
3783		    <entry>integer menu</entry>
3784		  </row><row><entry spanname="descr">Determines ISO equivalent of an
3785	image sensor indicating the sensor's sensitivity to light. The numbers are
3786	expressed in arithmetic scale, as per <xref linkend="iso12232" /> standard,
3787	where doubling the sensor sensitivity is represented by doubling the numerical
3788	ISO value. Applications should interpret the values as standard ISO values
3789	multiplied by 1000, e.g. control value 800 stands for ISO 0.8. Drivers will
3790	usually support only a subset of standard ISO values. The effect of setting
3791	this control while the <constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>
3792	control is set to a value other than <constant>V4L2_CID_ISO_SENSITIVITY_MANUAL
3793	</constant> is undefined, drivers should ignore such requests.</entry>
3794		  </row>
3795		  <row><entry></entry></row>
3796	
3797		  <row id="v4l2-iso-sensitivity-auto-type">
3798		    <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>&nbsp;</entry>
3799		    <entry>enum&nbsp;v4l2_iso_sensitivity_type</entry>
3800		  </row><row><entry spanname="descr">Enables or disables automatic ISO
3801	sensitivity adjustments.</entry>
3802		  </row>
3803		  <row>
3804		    <entrytbl spanname="descr" cols="2">
3805		      <tbody valign="top">
3806			<row>
3807			  <entry><constant>V4L2_CID_ISO_SENSITIVITY_MANUAL</constant>&nbsp;</entry>
3808			  <entry>Manual ISO sensitivity.</entry>
3809			</row>
3810			<row>
3811			  <entry><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>&nbsp;</entry>
3812			  <entry>Automatic ISO sensitivity adjustments.</entry>
3813			</row>
3814		      </tbody>
3815		    </entrytbl>
3816		  </row>
3817		  <row><entry></entry></row>
3818	
3819		  <row id="v4l2-scene-mode">
3820		    <entry spanname="id"><constant>V4L2_CID_SCENE_MODE</constant>&nbsp;</entry>
3821		    <entry>enum&nbsp;v4l2_scene_mode</entry>
3822		  </row><row><entry spanname="descr">This control allows to select
3823	scene programs as the camera automatic modes optimized for common shooting
3824	scenes. Within these modes the camera determines best exposure, aperture,
3825	focusing, light metering, white balance and equivalent sensitivity. The
3826	controls of those parameters are influenced by the scene mode control.
3827	An exact behavior in each mode is subject to the camera specification.
3828	
3829	<para>When the scene mode feature is not used, this control should be set to
3830	<constant>V4L2_SCENE_MODE_NONE</constant> to make sure the other possibly
3831	related controls are accessible. The following scene programs are defined:
3832	</para>
3833	</entry>
3834		  </row>
3835		  <row>
3836		    <entrytbl spanname="descr" cols="2">
3837		      <tbody valign="top">
3838			<row>
3839			  <entry><constant>V4L2_SCENE_MODE_NONE</constant>&nbsp;</entry>
3840			  <entry>The scene mode feature is disabled.</entry>
3841			</row>
3842			<row>
3843			  <entry><constant>V4L2_SCENE_MODE_BACKLIGHT</constant>&nbsp;</entry>
3844			  <entry>Backlight. Compensates for dark shadows when light is
3845			  coming from behind a subject, also by automatically turning
3846			  on the flash.</entry>
3847			</row>
3848			<row>
3849			  <entry><constant>V4L2_SCENE_MODE_BEACH_SNOW</constant>&nbsp;</entry>
3850			  <entry>Beach and snow. This mode compensates for all-white or
3851	bright scenes, which tend to look gray and low contrast, when camera's automatic
3852	exposure is based on an average scene brightness. To compensate, this mode
3853	automatically slightly overexposes the frames. The white balance may also be
3854	adjusted to compensate for the fact that reflected snow looks bluish rather
3855	than white.</entry>
3856			</row>
3857			<row>
3858			  <entry><constant>V4L2_SCENE_MODE_CANDLELIGHT</constant>&nbsp;</entry>
3859			  <entry>Candle light. The camera generally raises the ISO
3860	sensitivity and lowers the shutter speed. This mode compensates for relatively
3861	close subject in the scene. The flash is disabled in order to preserve the
3862	ambiance of the light.</entry>
3863			</row>
3864			<row>
3865			  <entry><constant>V4L2_SCENE_MODE_DAWN_DUSK</constant>&nbsp;</entry>
3866			  <entry>Dawn and dusk. Preserves the colors seen in low
3867	natural light before dusk and after down. The camera may turn off the flash,
3868	and automatically focus at infinity. It will usually boost saturation and
3869	lower the shutter speed.</entry>
3870			</row>
3871			<row>
3872			  <entry><constant>V4L2_SCENE_MODE_FALL_COLORS</constant>&nbsp;</entry>
3873			  <entry>Fall colors. Increases saturation and adjusts white
3874	balance for color enhancement. Pictures of autumn leaves get saturated reds
3875	and yellows.</entry>
3876			</row>
3877			<row>
3878			  <entry><constant>V4L2_SCENE_MODE_FIREWORKS</constant>&nbsp;</entry>
3879			  <entry>Fireworks. Long exposure times are used to capture
3880	the expanding burst of light from a firework. The camera may invoke image
3881	stabilization.</entry>
3882			</row>
3883			<row>
3884			  <entry><constant>V4L2_SCENE_MODE_LANDSCAPE</constant>&nbsp;</entry>
3885			  <entry>Landscape. The camera may choose a small aperture to
3886	provide deep depth of field and long exposure duration to help capture detail
3887	in dim light conditions. The focus is fixed at infinity. Suitable for distant
3888	and wide scenery.</entry>
3889			</row>
3890			<row>
3891			  <entry><constant>V4L2_SCENE_MODE_NIGHT</constant>&nbsp;</entry>
3892			  <entry>Night, also known as Night Landscape. Designed for low
3893	light conditions, it preserves detail in the dark areas without blowing out bright
3894	objects. The camera generally sets itself to a medium-to-high ISO sensitivity,
3895	with a relatively long exposure time, and turns flash off. As such, there will be
3896	increased image noise and the possibility of blurred image.</entry>
3897			</row>
3898			<row>
3899			  <entry><constant>V4L2_SCENE_MODE_PARTY_INDOOR</constant>&nbsp;</entry>
3900			  <entry>Party and indoor. Designed to capture indoor scenes
3901	that are lit by indoor background lighting as well as the flash. The camera
3902	usually increases ISO sensitivity, and adjusts exposure for the low light
3903	conditions.</entry>
3904			</row>
3905			<row>
3906			  <entry><constant>V4L2_SCENE_MODE_PORTRAIT</constant>&nbsp;</entry>
3907			  <entry>Portrait. The camera adjusts the aperture so that the
3908	depth of field is reduced, which helps to isolate the subject against a smooth
3909	background. Most cameras recognize the presence of faces in the scene and focus
3910	on them. The color hue is adjusted to enhance skin tones. The intensity of the
3911	flash is often reduced.</entry>
3912			</row>
3913			<row>
3914			  <entry><constant>V4L2_SCENE_MODE_SPORTS</constant>&nbsp;</entry>
3915			  <entry>Sports. Significantly increases ISO and uses a fast
3916	shutter speed to freeze motion of rapidly-moving subjects. Increased image
3917	noise may be seen in this mode.</entry>
3918			</row>
3919			<row>
3920			  <entry><constant>V4L2_SCENE_MODE_SUNSET</constant>&nbsp;</entry>
3921			  <entry>Sunset. Preserves deep hues seen in sunsets and
3922	sunrises. It bumps up the saturation.</entry>
3923			</row>
3924			<row>
3925			  <entry><constant>V4L2_SCENE_MODE_TEXT</constant>&nbsp;</entry>
3926			  <entry>Text. It applies extra contrast and sharpness, it is
3927	typically a black-and-white mode optimized for readability. Automatic focus
3928	may be switched to close-up mode and this setting may also involve some
3929	lens-distortion correction.</entry>
3930			</row>
3931		      </tbody>
3932		    </entrytbl>
3933		  </row>
3934		  <row><entry></entry></row>
3935	
3936		  <row>
3937		    <entry spanname="id"><constant>V4L2_CID_3A_LOCK</constant></entry>
3938		    <entry>bitmask</entry>
3939		  </row>
3940		  <row>
3941		    <entry spanname="descr">This control locks or unlocks the automatic
3942	focus, exposure and white balance. The automatic adjustments can be paused
3943	independently by setting the corresponding lock bit to 1. The camera then retains
3944	the settings until the lock bit is cleared. The following lock bits are defined:
3945	</entry>
3946		  </row>
3947		  <row>
3948		    <entrytbl spanname="descr" cols="2">
3949		      <tbody valign="top">
3950			<row>
3951			  <entry><constant>V4L2_LOCK_EXPOSURE</constant></entry>
3952			  <entry>Automatic exposure adjustments lock.</entry>
3953			</row>
3954			<row>
3955			  <entry><constant>V4L2_LOCK_WHITE_BALANCE</constant></entry>
3956			  <entry>Automatic white balance adjustments lock.</entry>
3957			</row>
3958			<row>
3959			  <entry><constant>V4L2_LOCK_FOCUS</constant></entry>
3960			  <entry>Automatic focus lock.</entry>
3961			</row>
3962		      </tbody>
3963		    </entrytbl>
3964		  </row>
3965		  <row><entry spanname="descr">
3966	When a given algorithm is not enabled, drivers should ignore requests
3967	to lock it and should return no error. An example might be an application
3968	setting bit <constant>V4L2_LOCK_WHITE_BALANCE</constant> when the
3969	<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant> control is set to
3970	<constant>FALSE</constant>. The value of this control may be changed
3971	by exposure, white balance or focus controls.</entry>
3972		  </row>
3973		  <row><entry></entry></row>
3974	
3975		  <row>
3976		    <entry spanname="id"><constant>V4L2_CID_PAN_SPEED</constant>&nbsp;</entry>
3977		    <entry>integer</entry>
3978		  </row><row><entry spanname="descr">This control turns the
3979	camera horizontally at the specific speed. The unit is undefined. A
3980	positive value moves the camera to the right (clockwise when viewed
3981	from above), a negative value to the left. A value of zero stops the motion
3982	if one is in progress and has no effect otherwise.</entry>
3983		  </row>
3984		  <row><entry></entry></row>
3985	
3986		  <row>
3987		    <entry spanname="id"><constant>V4L2_CID_TILT_SPEED</constant>&nbsp;</entry>
3988		    <entry>integer</entry>
3989		  </row><row><entry spanname="descr">This control turns the
3990	camera vertically at the specified speed. The unit is undefined. A
3991	positive value moves the camera up, a negative value down. A value of zero
3992	stops the motion if one is in progress and has no effect otherwise.</entry>
3993		  </row>
3994		  <row><entry></entry></row>
3995	
3996		</tbody>
3997	      </tgroup>
3998	    </table>
3999	  </section>
4000	
4001	    <section id="fm-tx-controls">
4002	      <title>FM Transmitter Control Reference</title>
4003	
4004	      <para>The FM Transmitter (FM_TX) class includes controls for common features of
4005	FM transmissions capable devices. Currently this class includes parameters for audio
4006	compression, pilot tone generation, audio deviation limiter, RDS transmission and
4007	tuning power features.</para>
4008	
4009	      <table pgwide="1" frame="none" id="fm-tx-control-id">
4010	      <title>FM_TX Control IDs</title>
4011	
4012	      <tgroup cols="4">
4013		<colspec colname="c1" colwidth="1*" />
4014		<colspec colname="c2" colwidth="6*" />
4015		<colspec colname="c3" colwidth="2*" />
4016		<colspec colname="c4" colwidth="6*" />
4017		<spanspec namest="c1" nameend="c2" spanname="id" />
4018		<spanspec namest="c2" nameend="c4" spanname="descr" />
4019		<thead>
4020		  <row>
4021		    <entry spanname="id" align="left">ID</entry>
4022		    <entry align="left">Type</entry>
4023		  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
4024		  </row>
4025		</thead>
4026		<tbody valign="top">
4027		  <row><entry></entry></row>
4028		  <row>
4029		    <entry spanname="id"><constant>V4L2_CID_FM_TX_CLASS</constant>&nbsp;</entry>
4030		    <entry>class</entry>
4031		  </row><row><entry spanname="descr">The FM_TX class
4032	descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
4033	description of this control class.</entry>
4034		  </row>
4035		  <row>
4036		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_DEVIATION</constant>&nbsp;</entry>
4037		    <entry>integer</entry>
4038		  </row>
4039		  <row><entry spanname="descr">Configures RDS signal frequency deviation level in Hz.
4040	The range and step are driver-specific.</entry>
4041		  </row>
4042		  <row>
4043		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_PI</constant>&nbsp;</entry>
4044		    <entry>integer</entry>
4045		  </row>
4046		  <row><entry spanname="descr">Sets the RDS Programme Identification field
4047	for transmission.</entry>
4048		  </row>
4049		  <row>
4050		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_PTY</constant>&nbsp;</entry>
4051		    <entry>integer</entry>
4052		  </row>
4053		  <row><entry spanname="descr">Sets the RDS Programme Type field for transmission.
4054	This encodes up to 31 pre-defined programme types.</entry>
4055		  </row>
4056		  <row>
4057		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_PS_NAME</constant>&nbsp;</entry>
4058		    <entry>string</entry>
4059		  </row>
4060		  <row><entry spanname="descr">Sets the Programme Service name (PS_NAME) for transmission.
4061	It is intended for static display on a receiver. It is the primary aid to listeners in programme service
4062	identification and selection.  In Annex E of <xref linkend="iec62106" />, the RDS specification,
4063	there is a full description of the correct character encoding for Programme Service name strings.
4064	Also from RDS specification, PS is usually a single eight character text. However, it is also possible
4065	to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured
4066	with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry>
4067		  </row>
4068		  <row>
4069		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_RADIO_TEXT</constant>&nbsp;</entry>
4070		    <entry>string</entry>
4071		  </row>
4072		  <row><entry spanname="descr">Sets the Radio Text info for transmission. It is a textual description of
4073	what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names,
4074	programme-related information or any other text. In these cases, RadioText should be used in addition to
4075	<constant>V4L2_CID_RDS_TX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described
4076	in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being
4077	used to transmit it, either 32 (2A block) or 64 (2B block).  However, it is also possible
4078	to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured
4079	with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry>
4080		  </row>
4081		  <row>
4082		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_MONO_STEREO</constant>&nbsp;</entry>
4083		    <entry>boolean</entry>
4084		  </row>
4085		  <row><entry spanname="descr">Sets the Mono/Stereo bit of the Decoder Identification code. If set,
4086	then the audio was recorded as stereo.</entry>
4087		  </row>
4088		  <row>
4089		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_ARTIFICIAL_HEAD</constant>&nbsp;</entry>
4090		    <entry>boolean</entry>
4091		  </row>
4092		  <row><entry spanname="descr">Sets the
4093	<ulink url="http://en.wikipedia.org/wiki/Artificial_head">Artificial Head</ulink> bit of the Decoder
4094	Identification code. If set, then the audio was recorded using an artificial head.</entry>
4095		  </row>
4096		  <row>
4097		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_COMPRESSED</constant>&nbsp;</entry>
4098		    <entry>boolean</entry>
4099		  </row>
4100		  <row><entry spanname="descr">Sets the Compressed bit of the Decoder Identification code. If set,
4101	then the audio is compressed.</entry>
4102		  </row>
4103		  <row>
4104		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_DYNAMIC_PTY</constant>&nbsp;</entry>
4105		    <entry>boolean</entry>
4106		  </row>
4107		  <row><entry spanname="descr">Sets the Dynamic PTY bit of the Decoder Identification code. If set,
4108	then the PTY code is dynamically switched.</entry>
4109		  </row>
4110		  <row>
4111		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT</constant>&nbsp;</entry>
4112		    <entry>boolean</entry>
4113		  </row>
4114		  <row><entry spanname="descr">If set, then a traffic announcement is in progress.</entry>
4115		  </row>
4116		  <row>
4117		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_TRAFFIC_PROGRAM</constant>&nbsp;</entry>
4118		    <entry>boolean</entry>
4119		  </row>
4120		  <row><entry spanname="descr">If set, then the tuned programme carries traffic announcements.</entry>
4121		  </row>
4122		  <row>
4123		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_MUSIC_SPEECH</constant>&nbsp;</entry>
4124		    <entry>boolean</entry>
4125		  </row>
4126		  <row><entry spanname="descr">If set, then this channel broadcasts music. If cleared, then it
4127	broadcasts speech. If the transmitter doesn't make this distinction, then it should be set.</entry>
4128		  </row>
4129		  <row>
4130		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_ALT_FREQS_ENABLE</constant>&nbsp;</entry>
4131		    <entry>boolean</entry>
4132		  </row>
4133		  <row><entry spanname="descr">If set, then transmit alternate frequencies.</entry>
4134		  </row>
4135		  <row>
4136		    <entry spanname="id"><constant>V4L2_CID_RDS_TX_ALT_FREQS</constant>&nbsp;</entry>
4137		    <entry>__u32 array</entry>
4138		  </row>
4139		  <row><entry spanname="descr">The alternate frequencies in kHz units. The RDS standard allows
4140	for up to 25 frequencies to be defined. Drivers may support fewer frequencies so check
4141	the array size.</entry>
4142		  </row>
4143		  <row>
4144		    <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_ENABLED</constant>&nbsp;</entry>
4145		    <entry>boolean</entry>
4146		  </row>
4147		  <row><entry spanname="descr">Enables or disables the audio deviation limiter feature.
4148	The limiter is useful when trying to maximize the audio volume, minimize receiver-generated
4149	distortion and prevent overmodulation.
4150	</entry>
4151		  </row>
4152		  <row>
4153		    <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_RELEASE_TIME</constant>&nbsp;</entry>
4154		    <entry>integer</entry>
4155		  </row>
4156		  <row><entry spanname="descr">Sets the audio deviation limiter feature release time.
4157	Unit is in useconds. Step and range are driver-specific.</entry>
4158		  </row>
4159		  <row>
4160		    <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_DEVIATION</constant>&nbsp;</entry>
4161		    <entry>integer</entry>
4162		  </row>
4163		  <row><entry spanname="descr">Configures audio frequency deviation level in Hz.
4164	The range and step are driver-specific.</entry>
4165		  </row>
4166		  <row>
4167		    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ENABLED</constant>&nbsp;</entry>
4168		    <entry>boolean</entry>
4169		  </row>
4170		  <row><entry spanname="descr">Enables or disables the audio compression feature.
4171	This feature amplifies signals below the threshold by a fixed gain and compresses audio
4172	signals above the threshold by the ratio of Threshold/(Gain + Threshold).</entry>
4173		  </row>
4174		  <row>
4175		    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_GAIN</constant>&nbsp;</entry>
4176		    <entry>integer</entry>
4177		  </row>
4178		  <row><entry spanname="descr">Sets the gain for audio compression feature. It is
4179	a dB value. The range and step are driver-specific.</entry>
4180		  </row>
4181		  <row>
4182		    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_THRESHOLD</constant>&nbsp;</entry>
4183		    <entry>integer</entry>
4184		  </row>
4185		  <row><entry spanname="descr">Sets the threshold level for audio compression freature.
4186	It is a dB value. The range and step are driver-specific.</entry>
4187		  </row>
4188		  <row>
4189		    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME</constant>&nbsp;</entry>
4190		    <entry>integer</entry>
4191		  </row>
4192		  <row><entry spanname="descr">Sets the attack time for audio compression feature.
4193	It is a useconds value. The range and step are driver-specific.</entry>
4194		  </row>
4195		  <row>
4196		    <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME</constant>&nbsp;</entry>
4197		    <entry>integer</entry>
4198		  </row>
4199		  <row><entry spanname="descr">Sets the release time for audio compression feature.
4200	It is a useconds value. The range and step are driver-specific.</entry>
4201		  </row>
4202		  <row>
4203		    <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_ENABLED</constant>&nbsp;</entry>
4204		    <entry>boolean</entry>
4205		  </row>
4206		  <row><entry spanname="descr">Enables or disables the pilot tone generation feature.</entry>
4207		  </row>
4208		  <row>
4209		    <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_DEVIATION</constant>&nbsp;</entry>
4210		    <entry>integer</entry>
4211		  </row>
4212		  <row><entry spanname="descr">Configures pilot tone frequency deviation level. Unit is
4213	in Hz. The range and step are driver-specific.</entry>
4214		  </row>
4215		  <row>
4216		    <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_FREQUENCY</constant>&nbsp;</entry>
4217		    <entry>integer</entry>
4218		  </row>
4219		  <row><entry spanname="descr">Configures pilot tone frequency value. Unit is
4220	in Hz. The range and step are driver-specific.</entry>
4221		  </row>
4222		  <row>
4223		    <entry spanname="id"><constant>V4L2_CID_TUNE_PREEMPHASIS</constant>&nbsp;</entry>
4224		    <entry>enum v4l2_preemphasis</entry>
4225		  </row>
4226		  <row id="v4l2-preemphasis"><entry spanname="descr">Configures the pre-emphasis value for broadcasting.
4227	A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
4228	Depending on the region, a time constant of either 50 or 75 useconds is used. The enum&nbsp;v4l2_preemphasis
4229	defines possible values for pre-emphasis. Here they are:</entry>
4230		</row><row>
4231		<entrytbl spanname="descr" cols="2">
4232			  <tbody valign="top">
4233			    <row>
4234			      <entry><constant>V4L2_PREEMPHASIS_DISABLED</constant>&nbsp;</entry>
4235			      <entry>No pre-emphasis is applied.</entry>
4236			    </row>
4237			    <row>
4238			      <entry><constant>V4L2_PREEMPHASIS_50_uS</constant>&nbsp;</entry>
4239			      <entry>A pre-emphasis of 50 uS is used.</entry>
4240			    </row>
4241			    <row>
4242			      <entry><constant>V4L2_PREEMPHASIS_75_uS</constant>&nbsp;</entry>
4243			      <entry>A pre-emphasis of 75 uS is used.</entry>
4244			    </row>
4245			  </tbody>
4246			</entrytbl>
4247	
4248		  </row>
4249		  <row>
4250		    <entry spanname="id"><constant>V4L2_CID_TUNE_POWER_LEVEL</constant>&nbsp;</entry>
4251		    <entry>integer</entry>
4252		  </row>
4253		  <row><entry spanname="descr">Sets the output power level for signal transmission.
4254	Unit is in dBuV. Range and step are driver-specific.</entry>
4255		  </row>
4256		  <row>
4257		    <entry spanname="id"><constant>V4L2_CID_TUNE_ANTENNA_CAPACITOR</constant>&nbsp;</entry>
4258		    <entry>integer</entry>
4259		  </row>
4260		  <row><entry spanname="descr">This selects the value of antenna tuning capacitor
4261	manually or automatically if set to zero. Unit, range and step are driver-specific.</entry>
4262		  </row>
4263		  <row><entry></entry></row>
4264		</tbody>
4265	      </tgroup>
4266	      </table>
4267	
4268	<para>For more details about RDS specification, refer to
4269	<xref linkend="iec62106" /> document, from CENELEC.</para>
4270	    </section>
4271	
4272	    <section id="flash-controls">
4273	      <title>Flash Control Reference</title>
4274	
4275	      <para>
4276		The V4L2 flash controls are intended to provide generic access
4277		to flash controller devices. Flash controller devices are
4278		typically used in digital cameras.
4279	      </para>
4280	
4281	      <para>
4282		The interface can support both LED and xenon flash devices. As
4283		of writing this, there is no xenon flash driver using this
4284		interface.
4285	      </para>
4286	
4287	      <section id="flash-controls-use-cases">
4288		<title>Supported use cases</title>
4289	
4290		<section>
4291		  <title>Unsynchronised LED flash (software strobe)</title>
4292	
4293		  <para>
4294		    Unsynchronised LED flash is controlled directly by the
4295		    host as the sensor. The flash must be enabled by the host
4296		    before the exposure of the image starts and disabled once
4297		    it ends. The host is fully responsible for the timing of
4298		    the flash.
4299		  </para>
4300	
4301		  <para>Example of such device: Nokia N900.</para>
4302		</section>
4303	
4304		<section>
4305		  <title>Synchronised LED flash (hardware strobe)</title>
4306	
4307		  <para>
4308		    The synchronised LED flash is pre-programmed by the host
4309		    (power and timeout) but controlled by the sensor through a
4310		    strobe signal from the sensor to the flash.
4311		  </para>
4312	
4313		  <para>
4314		    The sensor controls the flash duration and timing. This
4315		    information typically must be made available to the
4316		    sensor.
4317		  </para>
4318	
4319		</section>
4320	
4321		<section>
4322		  <title>LED flash as torch</title>
4323	
4324		  <para>
4325		    LED flash may be used as torch in conjunction with another
4326		    use case involving camera or individually.
4327		  </para>
4328	
4329	
4330	          <table pgwide="1" frame="none" id="flash-control-id">
4331	          <title>Flash Control IDs</title>
4332	    
4333	          <tgroup cols="4">
4334	    	<colspec colname="c1" colwidth="1*" />
4335	    	<colspec colname="c2" colwidth="6*" />
4336	    	<colspec colname="c3" colwidth="2*" />
4337	    	<colspec colname="c4" colwidth="6*" />
4338	    	<spanspec namest="c1" nameend="c2" spanname="id" />
4339	    	<spanspec namest="c2" nameend="c4" spanname="descr" />
4340	    	<thead>
4341	    	  <row>
4342	    	    <entry spanname="id" align="left">ID</entry>
4343	    	    <entry align="left">Type</entry>
4344	    	  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
4345	    	  </row>
4346	    	</thead>
4347	    	<tbody valign="top">
4348	    	  <row><entry></entry></row>
4349	    	  <row>
4350	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_CLASS</constant></entry>
4351	    	    <entry>class</entry>
4352	    	  </row>
4353	    	  <row>
4354	    	    <entry spanname="descr">The FLASH class descriptor.</entry>
4355	    	  </row>
4356	    	  <row>
4357	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_LED_MODE</constant></entry>
4358	    	    <entry>menu</entry>
4359	    	  </row>
4360	    	  <row id="v4l2-flash-led-mode">
4361	    	    <entry spanname="descr">Defines the mode of the flash LED,
4362	    	    the high-power white LED attached to the flash controller.
4363	    	    Setting this control may not be possible in presence of
4364	    	    some faults. See V4L2_CID_FLASH_FAULT.</entry>
4365	    	  </row>
4366	    	  <row>
4367	    	    <entrytbl spanname="descr" cols="2">
4368	    	      <tbody valign="top">
4369	    		<row>
4370	    		  <entry><constant>V4L2_FLASH_LED_MODE_NONE</constant></entry>
4371	    		  <entry>Off.</entry>
4372	    		</row>
4373	    		<row>
4374	    		  <entry><constant>V4L2_FLASH_LED_MODE_FLASH</constant></entry>
4375	    		  <entry>Flash mode.</entry>
4376	    		</row>
4377	    		<row>
4378	    		  <entry><constant>V4L2_FLASH_LED_MODE_TORCH</constant></entry>
4379	    		  <entry>Torch mode. See V4L2_CID_FLASH_TORCH_INTENSITY.</entry>
4380	    		</row>
4381	    	      </tbody>
4382	    	    </entrytbl>
4383	    	  </row>
4384	    	  <row>
4385	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_SOURCE</constant></entry>
4386	    	    <entry>menu</entry>
4387	    	  </row>
4388	    	  <row id="v4l2-flash-strobe-source"><entry
4389	    	  spanname="descr">Defines the source of the flash LED
4390	    	  strobe.</entry>
4391	    	  </row>
4392	    	  <row>
4393	    	    <entrytbl spanname="descr" cols="2">
4394	    	      <tbody valign="top">
4395	    		<row>
4396	    		  <entry><constant>V4L2_FLASH_STROBE_SOURCE_SOFTWARE</constant></entry>
4397	    		  <entry>The flash strobe is triggered by using
4398	    		  the V4L2_CID_FLASH_STROBE control.</entry>
4399	    		</row>
4400	    		<row>
4401	    		  <entry><constant>V4L2_FLASH_STROBE_SOURCE_EXTERNAL</constant></entry>
4402	    		  <entry>The flash strobe is triggered by an
4403	    		  external source. Typically this is a sensor,
4404	    		  which makes it possible to synchronises the
4405	    		  flash strobe start to exposure start.</entry>
4406	    		</row>
4407	    	      </tbody>
4408	    	    </entrytbl>
4409	    	  </row>
4410	    	  <row>
4411	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE</constant></entry>
4412	    	    <entry>button</entry>
4413	    	  </row>
4414	    	  <row>
4415	    	    <entry spanname="descr">Strobe flash. Valid when
4416	    	    V4L2_CID_FLASH_LED_MODE is set to
4417	    	    V4L2_FLASH_LED_MODE_FLASH and V4L2_CID_FLASH_STROBE_SOURCE
4418	    	    is set to V4L2_FLASH_STROBE_SOURCE_SOFTWARE. Setting this
4419	    	    control may not be possible in presence of some faults.
4420	    	    See V4L2_CID_FLASH_FAULT.</entry>
4421	    	  </row>
4422	    	  <row>
4423	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STOP</constant></entry>
4424	    	    <entry>button</entry>
4425	    	  </row>
4426	    	  <row><entry spanname="descr">Stop flash strobe immediately.</entry>
4427	    	  </row>
4428	    	  <row>
4429	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STATUS</constant></entry>
4430	    	    <entry>boolean</entry>
4431	    	  </row>
4432	    	  <row>
4433	    	    <entry spanname="descr">Strobe status: whether the flash
4434	    	    is strobing at the moment or not. This is a read-only
4435	    	    control.</entry>
4436	    	  </row>
4437	    	  <row>
4438	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_TIMEOUT</constant></entry>
4439	    	    <entry>integer</entry>
4440	    	  </row>
4441	    	  <row>
4442	    	    <entry spanname="descr">Hardware timeout for flash. The
4443	    	    flash strobe is stopped after this period of time has
4444	    	    passed from the start of the strobe.</entry>
4445	    	  </row>
4446	    	  <row>
4447	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_INTENSITY</constant></entry>
4448	    	    <entry>integer</entry>
4449	    	  </row>
4450	    	  <row>
4451	    	    <entry spanname="descr">Intensity of the flash strobe when
4452	    	    the flash LED is in flash mode
4453	    	    (V4L2_FLASH_LED_MODE_FLASH). The unit should be milliamps
4454	    	    (mA) if possible.</entry>
4455	    	  </row>
4456	    	  <row>
4457	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_TORCH_INTENSITY</constant></entry>
4458	    	    <entry>integer</entry>
4459	    	  </row>
4460	    	  <row>
4461	    	    <entry spanname="descr">Intensity of the flash LED in
4462	    	    torch mode (V4L2_FLASH_LED_MODE_TORCH). The unit should be
4463	    	    milliamps (mA) if possible. Setting this control may not
4464	    	    be possible in presence of some faults. See
4465	    	    V4L2_CID_FLASH_FAULT.</entry>
4466	    	  </row>
4467	    	  <row>
4468	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_INDICATOR_INTENSITY</constant></entry>
4469	    	    <entry>integer</entry>
4470	    	  </row>
4471	    	  <row>
4472	    	    <entry spanname="descr">Intensity of the indicator LED.
4473	    	    The indicator LED may be fully independent of the flash
4474	    	    LED. The unit should be microamps (uA) if possible.</entry>
4475	    	  </row>
4476	    	  <row>
4477	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_FAULT</constant></entry>
4478	    	    <entry>bitmask</entry>
4479	    	  </row>
4480	    	  <row>
4481	    	    <entry spanname="descr">Faults related to the flash. The
4482	    	    faults tell about specific problems in the flash chip
4483	    	    itself or the LEDs attached to it. Faults may prevent
4484	    	    further use of some of the flash controls. In particular,
4485	    	    V4L2_CID_FLASH_LED_MODE is set to V4L2_FLASH_LED_MODE_NONE
4486	    	    if the fault affects the flash LED. Exactly which faults
4487	    	    have such an effect is chip dependent. Reading the faults
4488	    	    resets the control and returns the chip to a usable state
4489	    	    if possible.</entry>
4490	    	  </row>
4491	    	  <row>
4492	    	    <entrytbl spanname="descr" cols="2">
4493	    	      <tbody valign="top">
4494	    		<row>
4495	    		  <entry><constant>V4L2_FLASH_FAULT_OVER_VOLTAGE</constant></entry>
4496	    		  <entry>Flash controller voltage to the flash LED
4497	    		  has exceeded the limit specific to the flash
4498	    		  controller.</entry>
4499	    		</row>
4500	    		<row>
4501	    		  <entry><constant>V4L2_FLASH_FAULT_TIMEOUT</constant></entry>
4502	    		  <entry>The flash strobe was still on when
4503	    		  the timeout set by the user ---
4504	    		  V4L2_CID_FLASH_TIMEOUT control --- has expired.
4505	    		  Not all flash controllers may set this in all
4506	    		  such conditions.</entry>
4507	    		</row>
4508	    		<row>
4509	    		  <entry><constant>V4L2_FLASH_FAULT_OVER_TEMPERATURE</constant></entry>
4510	    		  <entry>The flash controller has overheated.</entry>
4511	    		</row>
4512	    		<row>
4513	    		  <entry><constant>V4L2_FLASH_FAULT_SHORT_CIRCUIT</constant></entry>
4514	    		  <entry>The short circuit protection of the flash
4515	    		  controller has been triggered.</entry>
4516	    		</row>
4517	    		<row>
4518	    		  <entry><constant>V4L2_FLASH_FAULT_OVER_CURRENT</constant></entry>
4519	    		  <entry>Current in the LED power supply has exceeded the limit
4520	    		  specific to the flash controller.</entry>
4521	    		</row>
4522	    		<row>
4523	    		  <entry><constant>V4L2_FLASH_FAULT_INDICATOR</constant></entry>
4524	    		  <entry>The flash controller has detected a short or open
4525	    		  circuit condition on the indicator LED.</entry>
4526	    		</row>
4527			<row>
4528			  <entry><constant>V4L2_FLASH_FAULT_UNDER_VOLTAGE</constant></entry>
4529			  <entry>Flash controller voltage to the flash LED
4530			  has been below the minimum limit specific to the flash
4531			  controller.</entry>
4532			</row>
4533			<row>
4534			  <entry><constant>V4L2_FLASH_FAULT_INPUT_VOLTAGE</constant></entry>
4535			  <entry>The input voltage of the flash controller is below
4536			  the limit under which strobing the flash at full current
4537			  will not be possible.The condition persists until this flag
4538			  is no longer set.</entry>
4539			</row>
4540			<row>
4541			  <entry><constant>V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE</constant></entry>
4542			  <entry>The temperature of the LED has exceeded its
4543			  allowed upper limit.</entry>
4544			</row>
4545	    	      </tbody>
4546	    	    </entrytbl>
4547	    	  </row>
4548	    	  <row>
4549	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_CHARGE</constant></entry>
4550	    	    <entry>boolean</entry>
4551	    	  </row>
4552	    	  <row><entry spanname="descr">Enable or disable charging of the xenon
4553	    	  flash capacitor.</entry>
4554	    	  </row>
4555	    	  <row>
4556	    	    <entry spanname="id"><constant>V4L2_CID_FLASH_READY</constant></entry>
4557	    	    <entry>boolean</entry>
4558	    	  </row>
4559	    	  <row>
4560	    	    <entry spanname="descr">Is the flash ready to strobe?
4561	    	    Xenon flashes require their capacitors charged before
4562	    	    strobing. LED flashes often require a cooldown period
4563	    	    after strobe during which another strobe will not be
4564	    	    possible. This is a read-only control.</entry>
4565	    	  </row>
4566	    	  <row><entry></entry></row>
4567	    	</tbody>
4568	          </tgroup>
4569	          </table>
4570		</section>
4571	      </section>
4572	    </section>
4573	
4574	    <section id="jpeg-controls">
4575	      <title>JPEG Control Reference</title>
4576	      <para>The JPEG class includes controls for common features of JPEG
4577	      encoders and decoders. Currently it includes features for codecs
4578	      implementing progressive baseline DCT compression process with
4579	      Huffman entrophy coding.</para>
4580	      <table pgwide="1" frame="none" id="jpeg-control-id">
4581	      <title>JPEG Control IDs</title>
4582	
4583	      <tgroup cols="4">
4584		<colspec colname="c1" colwidth="1*" />
4585		<colspec colname="c2" colwidth="6*" />
4586		<colspec colname="c3" colwidth="2*" />
4587		<colspec colname="c4" colwidth="6*" />
4588		<spanspec namest="c1" nameend="c2" spanname="id" />
4589		<spanspec namest="c2" nameend="c4" spanname="descr" />
4590		<thead>
4591		  <row>
4592		    <entry spanname="id" align="left">ID</entry>
4593		    <entry align="left">Type</entry>
4594		  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
4595		  </row>
4596		</thead>
4597		<tbody valign="top">
4598		  <row><entry></entry></row>
4599		  <row>
4600		    <entry spanname="id"><constant>V4L2_CID_JPEG_CLASS</constant>&nbsp;</entry>
4601		    <entry>class</entry>
4602		  </row><row><entry spanname="descr">The JPEG class descriptor. Calling
4603		  &VIDIOC-QUERYCTRL; for this control will return a description of this
4604		  control class.
4605	
4606		</entry>
4607		  </row>
4608		  <row>
4609		    <entry spanname="id"><constant>V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant></entry>
4610		    <entry>menu</entry>
4611		  </row>
4612		  <row id="v4l2-jpeg-chroma-subsampling">
4613		    <entry spanname="descr">The chroma subsampling factors describe how
4614		    each component of an input image is sampled, in respect to maximum
4615		    sample rate in each spatial dimension. See <xref linkend="itu-t81"/>,
4616		    clause A.1.1. for more details. The <constant>
4617		    V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant> control determines how
4618		    Cb and Cr components are downsampled after coverting an input image
4619		    from RGB to Y'CbCr color space.
4620		    </entry>
4621		  </row>
4622		  <row>
4623		    <entrytbl spanname="descr" cols="2">
4624		      <tbody valign="top">
4625			<row>
4626			  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_444</constant>
4627			  </entry><entry>No chroma subsampling, each pixel has
4628			  Y, Cr and Cb values.</entry>
4629			</row>
4630			<row>
4631			  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_422</constant>
4632			  </entry><entry>Horizontally subsample Cr, Cb components
4633			  by a factor of 2.</entry>
4634			</row>
4635			<row>
4636			  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_420</constant>
4637			  </entry><entry>Subsample Cr, Cb components horizontally
4638			  and vertically by 2.</entry>
4639			</row>
4640			<row>
4641			  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_411</constant>
4642			  </entry><entry>Horizontally subsample Cr, Cb components
4643			  by a factor of 4.</entry>
4644			</row>
4645			<row>
4646			  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_410</constant>
4647			  </entry><entry>Subsample Cr, Cb components horizontally
4648			  by 4 and vertically by 2.</entry>
4649			</row>
4650			<row>
4651			  <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY</constant>
4652			  </entry><entry>Use only luminance component.</entry>
4653			</row>
4654		      </tbody>
4655		    </entrytbl>
4656		  </row>
4657		  <row>
4658		    <entry spanname="id"><constant>V4L2_CID_JPEG_RESTART_INTERVAL</constant>
4659		    </entry><entry>integer</entry>
4660		  </row>
4661		  <row><entry spanname="descr">
4662		      The restart interval determines an interval of inserting RSTm
4663		      markers (m = 0..7). The purpose of these markers is to additionally
4664		      reinitialize the encoder process, in order to process blocks of
4665		      an image independently.
4666		      For the lossy compression processes the restart interval unit is
4667		      MCU (Minimum Coded Unit) and its value is contained in DRI
4668		      (Define Restart Interval) marker. If <constant>
4669		      V4L2_CID_JPEG_RESTART_INTERVAL</constant> control is set to 0,
4670		      DRI and RSTm markers will not be inserted.
4671		    </entry>
4672		  </row>
4673		  <row id="jpeg-quality-control">
4674		    <entry spanname="id"><constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant></entry>
4675		    <entry>integer</entry>
4676		  </row>
4677		  <row>
4678		    <entry spanname="descr">
4679		      <constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control
4680		      determines trade-off between image quality and size.
4681		      It provides simpler method for applications to control image quality,
4682		      without a need for direct reconfiguration of luminance and chrominance
4683		      quantization tables.
4684	
4685		      In cases where a driver uses quantization tables configured directly
4686		      by an application, using interfaces defined elsewhere, <constant>
4687		      V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control should be set
4688		      by driver to 0.
4689	
4690		      <para>The value range of this control is driver-specific. Only
4691		      positive, non-zero values are meaningful. The recommended range
4692		      is 1 - 100, where larger values correspond to better image quality.
4693		      </para>
4694		    </entry>
4695		    </row>
4696		  <row id="jpeg-active-marker-control">
4697		    <entry spanname="id"><constant>V4L2_CID_JPEG_ACTIVE_MARKER</constant></entry>
4698		    <entry>bitmask</entry>
4699		  </row>
4700		  <row>
4701		    <entry spanname="descr">Specify which JPEG markers are included
4702		    in compressed stream. This control is valid only for encoders.
4703		    </entry>
4704		  </row>
4705		  <row>
4706		    <entrytbl spanname="descr" cols="2">
4707		      <tbody valign="top">
4708			<row>
4709			  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP0</constant></entry>
4710			  <entry>Application data segment APP<subscript>0</subscript>.</entry>
4711			</row><row>
4712			  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP1</constant></entry>
4713			  <entry>Application data segment APP<subscript>1</subscript>.</entry>
4714			</row><row>
4715			  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_COM</constant></entry>
4716			  <entry>Comment segment.</entry>
4717			</row><row>
4718			  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DQT</constant></entry>
4719			  <entry>Quantization tables segment.</entry>
4720			</row><row>
4721			  <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DHT</constant></entry>
4722			  <entry>Huffman tables segment.</entry>
4723			</row>
4724		      </tbody>
4725		    </entrytbl>
4726		  </row>
4727		  <row><entry></entry></row>
4728		</tbody>
4729	      </tgroup>
4730	      </table>
4731	      <para>For more details about JPEG specification, refer
4732	      to <xref linkend="itu-t81"/>, <xref linkend="jfif"/>,
4733	      <xref linkend="w3c-jpeg-jfif"/>.</para>
4734	    </section>
4735	
4736	    <section id="image-source-controls">
4737	      <title>Image Source Control Reference</title>
4738	
4739	      <para>
4740		The Image Source control class is intended for low-level
4741		control of image source devices such as image sensors. The
4742		devices feature an analogue to digital converter and a bus
4743		transmitter to transmit the image data out of the device.
4744	      </para>
4745	
4746	      <table pgwide="1" frame="none" id="image-source-control-id">
4747	      <title>Image Source Control IDs</title>
4748	
4749	      <tgroup cols="4">
4750		<colspec colname="c1" colwidth="1*" />
4751		<colspec colname="c2" colwidth="6*" />
4752		<colspec colname="c3" colwidth="2*" />
4753		<colspec colname="c4" colwidth="6*" />
4754		<spanspec namest="c1" nameend="c2" spanname="id" />
4755		<spanspec namest="c2" nameend="c4" spanname="descr" />
4756		<thead>
4757		  <row>
4758		    <entry spanname="id" align="left">ID</entry>
4759		    <entry align="left">Type</entry>
4760		  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
4761		  </row>
4762		</thead>
4763		<tbody valign="top">
4764		  <row><entry></entry></row>
4765		  <row>
4766		    <entry spanname="id"><constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant></entry>
4767		    <entry>class</entry>
4768		  </row>
4769		  <row>
4770		    <entry spanname="descr">The IMAGE_SOURCE class descriptor.</entry>
4771		  </row>
4772		  <row>
4773		    <entry spanname="id"><constant>V4L2_CID_VBLANK</constant></entry>
4774		    <entry>integer</entry>
4775		  </row>
4776		  <row>
4777		    <entry spanname="descr">Vertical blanking. The idle period
4778		    after every frame during which no image data is produced.
4779		    The unit of vertical blanking is a line. Every line has
4780		    length of the image width plus horizontal blanking at the
4781		    pixel rate defined by
4782		    <constant>V4L2_CID_PIXEL_RATE</constant> control in the
4783		    same sub-device.</entry>
4784		  </row>
4785		  <row>
4786		    <entry spanname="id"><constant>V4L2_CID_HBLANK</constant></entry>
4787		    <entry>integer</entry>
4788		  </row>
4789		  <row>
4790		    <entry spanname="descr">Horizontal blanking. The idle
4791		    period after every line of image data during which no
4792		    image data is produced. The unit of horizontal blanking is
4793		    pixels.</entry>
4794		  </row>
4795		  <row>
4796		    <entry spanname="id"><constant>V4L2_CID_ANALOGUE_GAIN</constant></entry>
4797		    <entry>integer</entry>
4798		  </row>
4799		  <row>
4800		    <entry spanname="descr">Analogue gain is gain affecting
4801		    all colour components in the pixel matrix. The gain
4802		    operation is performed in the analogue domain before A/D
4803		    conversion.
4804		    </entry>
4805		  </row>
4806		  <row>
4807		    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_RED</constant></entry>
4808		    <entry>integer</entry>
4809		  </row>
4810		  <row>
4811		    <entry spanname="descr">Test pattern red colour component.
4812		    </entry>
4813		  </row>
4814		  <row>
4815		    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_GREENR</constant></entry>
4816		    <entry>integer</entry>
4817		  </row>
4818		  <row>
4819		    <entry spanname="descr">Test pattern green (next to red)
4820		    colour component.
4821		    </entry>
4822		  </row>
4823		  <row>
4824		    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_BLUE</constant></entry>
4825		    <entry>integer</entry>
4826		  </row>
4827		  <row>
4828		    <entry spanname="descr">Test pattern blue colour component.
4829		    </entry>
4830		  </row>
4831		  <row>
4832		    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_GREENB</constant></entry>
4833		    <entry>integer</entry>
4834		  </row>
4835		  <row>
4836		    <entry spanname="descr">Test pattern green (next to blue)
4837		    colour component.
4838		    </entry>
4839		  </row>
4840		  <row><entry></entry></row>
4841		</tbody>
4842	      </tgroup>
4843	      </table>
4844	
4845	    </section>
4846	
4847	    <section id="image-process-controls">
4848	      <title>Image Process Control Reference</title>
4849	
4850	      <para>
4851		The Image Process control class is intended for low-level control of
4852		image processing functions. Unlike
4853		<constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant>, the controls in
4854		this class affect processing the image, and do not control capturing
4855		of it.
4856	      </para>
4857	
4858	      <table pgwide="1" frame="none" id="image-process-control-id">
4859	      <title>Image Process Control IDs</title>
4860	
4861	      <tgroup cols="4">
4862		<colspec colname="c1" colwidth="1*" />
4863		<colspec colname="c2" colwidth="6*" />
4864		<colspec colname="c3" colwidth="2*" />
4865		<colspec colname="c4" colwidth="6*" />
4866		<spanspec namest="c1" nameend="c2" spanname="id" />
4867		<spanspec namest="c2" nameend="c4" spanname="descr" />
4868		<thead>
4869		  <row>
4870		    <entry spanname="id" align="left">ID</entry>
4871		    <entry align="left">Type</entry>
4872		  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
4873		  </row>
4874		</thead>
4875		<tbody valign="top">
4876		  <row><entry></entry></row>
4877		  <row>
4878		    <entry spanname="id"><constant>V4L2_CID_IMAGE_PROC_CLASS</constant></entry>
4879		    <entry>class</entry>
4880		  </row>
4881		  <row>
4882		    <entry spanname="descr">The IMAGE_PROC class descriptor.</entry>
4883		  </row>
4884		  <row>
4885		    <entry spanname="id"><constant>V4L2_CID_LINK_FREQ</constant></entry>
4886		    <entry>integer menu</entry>
4887		  </row>
4888		  <row>
4889		    <entry spanname="descr">Data bus frequency. Together with the
4890		    media bus pixel code, bus type (clock cycles per sample), the
4891		    data bus frequency defines the pixel rate
4892		    (<constant>V4L2_CID_PIXEL_RATE</constant>) in the
4893		    pixel array (or possibly elsewhere, if the device is not an
4894		    image sensor). The frame rate can be calculated from the pixel
4895		    clock, image width and height and horizontal and vertical
4896		    blanking. While the pixel rate control may be defined elsewhere
4897		    than in the subdev containing the pixel array, the frame rate
4898		    cannot be obtained from that information. This is because only
4899		    on the pixel array it can be assumed that the vertical and
4900		    horizontal blanking information is exact: no other blanking is
4901		    allowed in the pixel array. The selection of frame rate is
4902		    performed by selecting the desired horizontal and vertical
4903		    blanking. The unit of this control is Hz. </entry>
4904		  </row>
4905		  <row>
4906		    <entry spanname="id"><constant>V4L2_CID_PIXEL_RATE</constant></entry>
4907		    <entry>64-bit integer</entry>
4908		  </row>
4909		  <row>
4910		    <entry spanname="descr">Pixel rate in the source pads of
4911		    the subdev. This control is read-only and its unit is
4912		    pixels / second.
4913		    </entry>
4914		  </row>
4915		  <row>
4916		    <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN</constant></entry>
4917		    <entry>menu</entry>
4918		  </row>
4919		  <row id="v4l2-test-pattern">
4920		    <entry spanname="descr"> Some capture/display/sensor devices have
4921		    the capability to generate test pattern images. These hardware
4922		    specific test patterns can be used to test if a device is working
4923		    properly.</entry>
4924		  </row>
4925		  <row><entry></entry></row>
4926		</tbody>
4927	      </tgroup>
4928	      </table>
4929	
4930	    </section>
4931	
4932	    <section id="dv-controls">
4933	      <title>Digital Video Control Reference</title>
4934	
4935	      <para>
4936		The Digital Video control class is intended to control receivers
4937		and transmitters for <ulink url="http://en.wikipedia.org/wiki/Vga">VGA</ulink>,
4938		<ulink url="http://en.wikipedia.org/wiki/Digital_Visual_Interface">DVI</ulink>
4939		(Digital Visual Interface), HDMI (<xref linkend="hdmi" />) and DisplayPort (<xref linkend="dp" />).
4940		These controls are generally expected to be private to the receiver or transmitter
4941		subdevice that implements them, so they are only exposed on the
4942		<filename>/dev/v4l-subdev*</filename> device node.
4943	      </para>
4944	
4945	      <para>Note that these devices can have multiple input or output pads which are
4946	      hooked up to e.g. HDMI connectors. Even though the subdevice will receive or
4947	      transmit video from/to only one of those pads, the other pads can still be
4948	      active when it comes to EDID (Extended Display Identification Data,
4949	      <xref linkend="vesaedid" />) and HDCP (High-bandwidth Digital Content
4950	      Protection System, <xref linkend="hdcp" />) processing, allowing the device
4951	      to do the fairly slow EDID/HDCP handling in advance. This allows for quick
4952	      switching between connectors.</para>
4953	
4954	      <para>These pads appear in several of the controls in this section as
4955	      bitmasks, one bit for each pad. Bit 0 corresponds to pad 0, bit 1 to pad 1,
4956	      etc. The maximum value of the control is the set of valid pads.</para>
4957	
4958	      <table pgwide="1" frame="none" id="dv-control-id">
4959	      <title>Digital Video Control IDs</title>
4960	
4961	      <tgroup cols="4">
4962		<colspec colname="c1" colwidth="1*" />
4963		<colspec colname="c2" colwidth="6*" />
4964		<colspec colname="c3" colwidth="2*" />
4965		<colspec colname="c4" colwidth="6*" />
4966		<spanspec namest="c1" nameend="c2" spanname="id" />
4967		<spanspec namest="c2" nameend="c4" spanname="descr" />
4968		<thead>
4969		  <row>
4970		    <entry spanname="id" align="left">ID</entry>
4971		    <entry align="left">Type</entry>
4972		  </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
4973		  </row>
4974		</thead>
4975		<tbody valign="top">
4976		  <row><entry></entry></row>
4977		  <row>
4978		    <entry spanname="id"><constant>V4L2_CID_DV_CLASS</constant></entry>
4979		    <entry>class</entry>
4980		  </row>
4981		  <row>
4982		    <entry spanname="descr">The Digital Video class descriptor.</entry>
4983		  </row>
4984		  <row>
4985		    <entry spanname="id"><constant>V4L2_CID_DV_TX_HOTPLUG</constant></entry>
4986		    <entry>bitmask</entry>
4987		  </row>
4988		  <row>
4989		    <entry spanname="descr">Many connectors have a hotplug pin which is high
4990		    if EDID information is available from the source. This control shows the
4991		    state of the hotplug pin as seen by the transmitter.
4992		    Each bit corresponds to an output pad on the transmitter. If an output pad
4993		    does not have an associated hotplug pin, then the bit for that pad will be 0.
4994		    This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors.
4995		    </entry>
4996		  </row>
4997		  <row>
4998		    <entry spanname="id"><constant>V4L2_CID_DV_TX_RXSENSE</constant></entry>
4999		    <entry>bitmask</entry>
5000		  </row>
5001		  <row>
5002		    <entry spanname="descr">Rx Sense is the detection of pull-ups on the TMDS
5003	            clock lines. This normally means that the sink has left/entered standby (i.e.
5004		    the transmitter can sense that the receiver is ready to receive video).
5005		    Each bit corresponds to an output pad on the transmitter. If an output pad
5006		    does not have an associated Rx Sense, then the bit for that pad will be 0.
5007		    This read-only control is applicable to DVI-D and HDMI devices.
5008		    </entry>
5009		  </row>
5010		  <row>
5011		    <entry spanname="id"><constant>V4L2_CID_DV_TX_EDID_PRESENT</constant></entry>
5012		    <entry>bitmask</entry>
5013		  </row>
5014		  <row>
5015		    <entry spanname="descr">When the transmitter sees the hotplug signal from the
5016		    receiver it will attempt to read the EDID. If set, then the transmitter has read
5017		    at least the first block (= 128 bytes).
5018		    Each bit corresponds to an output pad on the transmitter. If an output pad
5019		    does not support EDIDs, then the bit for that pad will be 0.
5020		    This read-only control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
5021		    </entry>
5022		  </row>
5023		  <row>
5024		    <entry spanname="id"><constant>V4L2_CID_DV_TX_MODE</constant></entry>
5025		    <entry id="v4l2-dv-tx-mode">enum v4l2_dv_tx_mode</entry>
5026		  </row>
5027		  <row>
5028		    <entry spanname="descr">HDMI transmitters can transmit in DVI-D mode (just video)
5029		    or in HDMI mode (video + audio + auxiliary data). This control selects which mode
5030		    to use: V4L2_DV_TX_MODE_DVI_D or V4L2_DV_TX_MODE_HDMI.
5031		    This control is applicable to HDMI connectors.
5032		    </entry>
5033		  </row>
5034		  <row>
5035		    <entry spanname="id"><constant>V4L2_CID_DV_TX_RGB_RANGE</constant></entry>
5036		    <entry id="v4l2-dv-rgb-range">enum v4l2_dv_rgb_range</entry>
5037		  </row>
5038		  <row>
5039		    <entry spanname="descr">Select the quantization range for RGB output. V4L2_DV_RANGE_AUTO
5040		    follows the RGB quantization range specified in the standard for the video interface
5041		    (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard
5042		    to be compatible with sinks that have not implemented the standard correctly
5043		    (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be
5044		    used whereas limited range sets the range to (16 &lt;&lt; (N-8)) - (235 &lt;&lt; (N-8))
5045		    where N is the number of bits per component.
5046		    This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
5047		    </entry>
5048		  </row>
5049		  <row>
5050		    <entry spanname="id"><constant>V4L2_CID_DV_TX_IT_CONTENT_TYPE</constant></entry>
5051		    <entry id="v4l2-dv-content-type">enum v4l2_dv_it_content_type</entry>
5052		  </row>
5053		  <row><entry spanname="descr">Configures the IT Content Type
5054		    of the transmitted video. This information is sent over HDMI and DisplayPort connectors
5055		    as part of the AVI InfoFrame. The term 'IT Content' is used for content that originates
5056		    from a computer as opposed to content from a TV broadcast or an analog source. The
5057		    enum&nbsp;v4l2_dv_it_content_type defines the possible content types:</entry>
5058		  </row>
5059		  <row>
5060		    <entrytbl spanname="descr" cols="2">
5061		      <tbody valign="top">
5062		        <row>
5063		          <entry><constant>V4L2_DV_IT_CONTENT_TYPE_GRAPHICS</constant>&nbsp;</entry>
5064			  <entry>Graphics content. Pixel data should be passed unfiltered and without
5065			  analog reconstruction.</entry>
5066			</row>
5067		        <row>
5068		          <entry><constant>V4L2_DV_IT_CONTENT_TYPE_PHOTO</constant>&nbsp;</entry>
5069			  <entry>Photo content. The content is derived from digital still pictures.
5070			  The content should be passed through with minimal scaling and picture
5071			  enhancements.</entry>
5072			</row>
5073		        <row>
5074		          <entry><constant>V4L2_DV_IT_CONTENT_TYPE_CINEMA</constant>&nbsp;</entry>
5075			  <entry>Cinema content.</entry>
5076			</row>
5077		        <row>
5078		          <entry><constant>V4L2_DV_IT_CONTENT_TYPE_GAME</constant>&nbsp;</entry>
5079			  <entry>Game content. Audio and video latency should be minimized.</entry>
5080			</row>
5081		        <row>
5082		          <entry><constant>V4L2_DV_IT_CONTENT_TYPE_NO_ITC</constant>&nbsp;</entry>
5083			  <entry>No IT Content information is available and the ITC bit in the AVI
5084			  InfoFrame is set to 0.</entry>
5085			</row>
5086		      </tbody>
5087		    </entrytbl>
5088		  </row>
5089		  <row>
5090		    <entry spanname="id"><constant>V4L2_CID_DV_RX_POWER_PRESENT</constant></entry>
5091		    <entry>bitmask</entry>
5092		  </row>
5093		  <row>
5094		    <entry spanname="descr">Detects whether the receiver receives power from the source
5095		    (e.g. HDMI carries 5V on one of the pins). This is often used to power an eeprom
5096		    which contains EDID information, such that the source can read the EDID even if
5097		    the sink is in standby/power off.
5098		    Each bit corresponds to an input pad on the transmitter. If an input pad
5099		    cannot detect whether power is present, then the bit for that pad will be 0.
5100		    This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors.
5101		    </entry>
5102		  </row>
5103		  <row>
5104		    <entry spanname="id"><constant>V4L2_CID_DV_RX_RGB_RANGE</constant></entry>
5105		    <entry>enum v4l2_dv_rgb_range</entry>
5106		  </row>
5107		  <row>
5108		    <entry spanname="descr">Select the quantization range for RGB input. V4L2_DV_RANGE_AUTO
5109		    follows the RGB quantization range specified in the standard for the video interface
5110		    (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard
5111		    to be compatible with sources that have not implemented the standard correctly
5112		    (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be
5113		    used whereas limited range sets the range to (16 &lt;&lt; (N-8)) - (235 &lt;&lt; (N-8))
5114		    where N is the number of bits per component.
5115		    This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
5116		    </entry>
5117		  </row>
5118		  <row>
5119		    <entry spanname="id"><constant>V4L2_CID_DV_RX_IT_CONTENT_TYPE</constant></entry>
5120		    <entry>enum v4l2_dv_it_content_type</entry>
5121		  </row>
5122		  <row><entry spanname="descr">Reads the IT Content Type
5123		    of the received video. This information is sent over HDMI and DisplayPort connectors
5124		    as part of the AVI InfoFrame. The term 'IT Content' is used for content that originates
5125		    from a computer as opposed to content from a TV broadcast or an analog source. See
5126		    <constant>V4L2_CID_DV_TX_IT_CONTENT_TYPE</constant> for the available content types.</entry>
5127		  </row>
5128		  <row><entry></entry></row>
5129		</tbody>
5130	      </tgroup>
5131	      </table>
5132	
5133	    </section>
5134	
5135	    <section id="fm-rx-controls">
5136	      <title>FM Receiver Control Reference</title>
5137	
5138	      <para>The FM Receiver (FM_RX) class includes controls for common features of
5139	      FM Reception capable devices.</para>
5140	
5141	      <table pgwide="1" frame="none" id="fm-rx-control-id">
5142	      <title>FM_RX Control IDs</title>
5143	
5144	      <tgroup cols="4">
5145	        <colspec colname="c1" colwidth="1*" />
5146	        <colspec colname="c2" colwidth="6*" />
5147	        <colspec colname="c3" colwidth="2*" />
5148	        <colspec colname="c4" colwidth="6*" />
5149	        <spanspec namest="c1" nameend="c2" spanname="id" />
5150	        <spanspec namest="c2" nameend="c4" spanname="descr" />
5151	        <thead>
5152	          <row>
5153	            <entry spanname="id" align="left">ID</entry>
5154	            <entry align="left">Type</entry>
5155	          </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
5156	          </row>
5157	        </thead>
5158	        <tbody valign="top">
5159	          <row><entry></entry></row>
5160	          <row>
5161	            <entry spanname="id"><constant>V4L2_CID_FM_RX_CLASS</constant>&nbsp;</entry>
5162	            <entry>class</entry>
5163	          </row><row><entry spanname="descr">The FM_RX class
5164	descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
5165	description of this control class.</entry>
5166	          </row>
5167	          <row>
5168	            <entry spanname="id"><constant>V4L2_CID_RDS_RECEPTION</constant>&nbsp;</entry>
5169	            <entry>boolean</entry>
5170	          </row><row><entry spanname="descr">Enables/disables RDS
5171		  reception by the radio tuner</entry>
5172	          </row>
5173		  <row>
5174		    <entry spanname="id"><constant>V4L2_CID_RDS_RX_PTY</constant>&nbsp;</entry>
5175		    <entry>integer</entry>
5176		  </row>
5177		  <row><entry spanname="descr">Gets RDS Programme Type field.
5178	This encodes up to 31 pre-defined programme types.</entry>
5179		  </row>
5180		  <row>
5181		    <entry spanname="id"><constant>V4L2_CID_RDS_RX_PS_NAME</constant>&nbsp;</entry>
5182		    <entry>string</entry>
5183		  </row>
5184		  <row><entry spanname="descr">Gets the Programme Service name (PS_NAME).
5185	It is intended for static display on a receiver. It is the primary aid to listeners in programme service
5186	identification and selection.  In Annex E of <xref linkend="iec62106" />, the RDS specification,
5187	there is a full description of the correct character encoding for Programme Service name strings.
5188	Also from RDS specification, PS is usually a single eight character text. However, it is also possible
5189	to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured
5190	with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry>
5191		  </row>
5192		  <row>
5193		    <entry spanname="id"><constant>V4L2_CID_RDS_RX_RADIO_TEXT</constant>&nbsp;</entry>
5194		    <entry>string</entry>
5195		  </row>
5196		  <row><entry spanname="descr">Gets the Radio Text info. It is a textual description of
5197	what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names,
5198	programme-related information or any other text. In these cases, RadioText can be used in addition to
5199	<constant>V4L2_CID_RDS_RX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described
5200	in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being
5201	used to transmit it, either 32 (2A block) or 64 (2B block).  However, it is also possible
5202	to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured
5203	with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry>
5204		  </row>
5205		  <row>
5206		    <entry spanname="id"><constant>V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT</constant>&nbsp;</entry>
5207		    <entry>boolean</entry>
5208		  </row>
5209		  <row><entry spanname="descr">If set, then a traffic announcement is in progress.</entry>
5210		  </row>
5211		  <row>
5212		    <entry spanname="id"><constant>V4L2_CID_RDS_RX_TRAFFIC_PROGRAM</constant>&nbsp;</entry>
5213		    <entry>boolean</entry>
5214		  </row>
5215		  <row><entry spanname="descr">If set, then the tuned programme carries traffic announcements.</entry>
5216		  </row>
5217		  <row>
5218		    <entry spanname="id"><constant>V4L2_CID_RDS_RX_MUSIC_SPEECH</constant>&nbsp;</entry>
5219		    <entry>boolean</entry>
5220		  </row>
5221		  <row><entry spanname="descr">If set, then this channel broadcasts music. If cleared, then it
5222	broadcasts speech. If the transmitter doesn't make this distinction, then it will be set.</entry>
5223		  </row>
5224	          <row>
5225		    <entry spanname="id"><constant>V4L2_CID_TUNE_DEEMPHASIS</constant>&nbsp;</entry>
5226		    <entry>enum v4l2_deemphasis</entry>
5227		  </row>
5228		  <row id="v4l2-deemphasis"><entry spanname="descr">Configures the de-emphasis value for reception.
5229	A de-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
5230	Depending on the region, a time constant of either 50 or 75 useconds is used. The enum&nbsp;v4l2_deemphasis
5231	defines possible values for de-emphasis. Here they are:</entry>
5232		</row><row>
5233		<entrytbl spanname="descr" cols="2">
5234			  <tbody valign="top">
5235			    <row>
5236			      <entry><constant>V4L2_DEEMPHASIS_DISABLED</constant>&nbsp;</entry>
5237			      <entry>No de-emphasis is applied.</entry>
5238			    </row>
5239			    <row>
5240			      <entry><constant>V4L2_DEEMPHASIS_50_uS</constant>&nbsp;</entry>
5241			      <entry>A de-emphasis of 50 uS is used.</entry>
5242			    </row>
5243			    <row>
5244			      <entry><constant>V4L2_DEEMPHASIS_75_uS</constant>&nbsp;</entry>
5245			      <entry>A de-emphasis of 75 uS is used.</entry>
5246			    </row>
5247			  </tbody>
5248			</entrytbl>
5249	
5250		  </row>
5251	          <row><entry></entry></row>
5252	        </tbody>
5253	      </tgroup>
5254	      </table>
5255	    </section>
5256	
5257	    <section id="detect-controls">
5258	      <title>Detect Control Reference</title>
5259	
5260	      <para>The Detect class includes controls for common features of
5261	      various motion or object detection capable devices.</para>
5262	
5263	      <table pgwide="1" frame="none" id="detect-control-id">
5264	      <title>Detect Control IDs</title>
5265	
5266	      <tgroup cols="4">
5267	        <colspec colname="c1" colwidth="1*" />
5268	        <colspec colname="c2" colwidth="6*" />
5269	        <colspec colname="c3" colwidth="2*" />
5270	        <colspec colname="c4" colwidth="6*" />
5271	        <spanspec namest="c1" nameend="c2" spanname="id" />
5272	        <spanspec namest="c2" nameend="c4" spanname="descr" />
5273	        <thead>
5274	          <row>
5275	            <entry spanname="id" align="left">ID</entry>
5276	            <entry align="left">Type</entry>
5277	          </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
5278	          </row>
5279	        </thead>
5280	        <tbody valign="top">
5281	          <row><entry></entry></row>
5282	          <row>
5283	            <entry spanname="id"><constant>V4L2_CID_DETECT_CLASS</constant>&nbsp;</entry>
5284	            <entry>class</entry>
5285	          </row><row><entry spanname="descr">The Detect class
5286	descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
5287	description of this control class.</entry>
5288	          </row>
5289	          <row>
5290	            <entry spanname="id"><constant>V4L2_CID_DETECT_MD_MODE</constant>&nbsp;</entry>
5291	            <entry>menu</entry>
5292	          </row><row><entry spanname="descr">Sets the motion detection mode.</entry>
5293	          </row>
5294		  <row>
5295		    <entrytbl spanname="descr" cols="2">
5296		      <tbody valign="top">
5297			<row>
5298			  <entry><constant>V4L2_DETECT_MD_MODE_DISABLED</constant>
5299			  </entry><entry>Disable motion detection.</entry>
5300			</row>
5301			<row>
5302			  <entry><constant>V4L2_DETECT_MD_MODE_GLOBAL</constant>
5303			  </entry><entry>Use a single motion detection threshold.</entry>
5304			</row>
5305			<row>
5306			  <entry><constant>V4L2_DETECT_MD_MODE_THRESHOLD_GRID</constant>
5307			  </entry><entry>The image is divided into a grid, each cell with its own
5308			  motion detection threshold. These thresholds are set through the
5309			  <constant>V4L2_CID_DETECT_MD_THRESHOLD_GRID</constant> matrix control.</entry>
5310			</row>
5311			<row>
5312			  <entry><constant>V4L2_DETECT_MD_MODE_REGION_GRID</constant>
5313			  </entry><entry>The image is divided into a grid, each cell with its own
5314			  region value that specifies which per-region motion detection thresholds
5315			  should be used. Each region has its own thresholds. How these per-region
5316			  thresholds are set up is driver-specific. The region values for the grid are set
5317			  through the <constant>V4L2_CID_DETECT_MD_REGION_GRID</constant> matrix
5318			  control.</entry>
5319			</row>
5320		      </tbody>
5321		    </entrytbl>
5322		  </row>
5323	          <row>
5324		    <entry spanname="id"><constant>V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD</constant>&nbsp;</entry>
5325		    <entry>integer</entry>
5326		  </row>
5327		  <row><entry spanname="descr">Sets the global motion detection threshold to be
5328		  used with the <constant>V4L2_DETECT_MD_MODE_GLOBAL</constant> motion detection mode.</entry>
5329	          </row>
5330	          <row>
5331		    <entry spanname="id"><constant>V4L2_CID_DETECT_MD_THRESHOLD_GRID</constant>&nbsp;</entry>
5332		    <entry>__u16 matrix</entry>
5333		  </row>
5334		  <row><entry spanname="descr">Sets the motion detection thresholds for each cell in the grid.
5335		  To be used with the <constant>V4L2_DETECT_MD_MODE_THRESHOLD_GRID</constant>
5336		  motion detection mode. Matrix element (0, 0) represents the cell at the top-left of the
5337		  grid.</entry>
5338	          </row>
5339	          <row>
5340		    <entry spanname="id"><constant>V4L2_CID_DETECT_MD_REGION_GRID</constant>&nbsp;</entry>
5341		    <entry>__u8 matrix</entry>
5342		  </row>
5343		  <row><entry spanname="descr">Sets the motion detection region value for each cell in the grid.
5344		  To be used with the <constant>V4L2_DETECT_MD_MODE_REGION_GRID</constant>
5345		  motion detection mode. Matrix element (0, 0) represents the cell at the top-left of the
5346		  grid.</entry>
5347	          </row>
5348	        </tbody>
5349	      </tgroup>
5350	      </table>
5351	
5352	      </section>
5353	
5354	    <section id="rf-tuner-controls">
5355	      <title>RF Tuner Control Reference</title>
5356	
5357	      <para>
5358	The RF Tuner (RF_TUNER) class includes controls for common features of devices
5359	having RF tuner.
5360	      </para>
5361	      <para>
5362	In this context, RF tuner is radio receiver circuit between antenna and
5363	demodulator. It receives radio frequency (RF) from the antenna and converts that
5364	received signal to lower intermediate frequency (IF) or baseband frequency (BB).
5365	Tuners that could do baseband output are often called Zero-IF tuners. Older
5366	tuners were typically simple PLL tuners inside a metal box, whilst newer ones
5367	are highly integrated chips without a metal box "silicon tuners". These controls
5368	are mostly applicable for new feature rich silicon tuners, just because older
5369	tuners does not have much adjustable features.
5370	      </para>
5371	      <para>
5372	For more information about RF tuners see
5373	<ulink url="http://en.wikipedia.org/wiki/Tuner_%28radio%29">Tuner (radio)</ulink>
5374	and
5375	<ulink url="http://en.wikipedia.org/wiki/RF_front_end">RF front end</ulink>
5376	from Wikipedia.
5377	      </para>
5378	
5379	      <table pgwide="1" frame="none" id="rf-tuner-control-id">
5380	        <title>RF_TUNER Control IDs</title>
5381	
5382	        <tgroup cols="4">
5383	          <colspec colname="c1" colwidth="1*" />
5384	          <colspec colname="c2" colwidth="6*" />
5385	          <colspec colname="c3" colwidth="2*" />
5386	          <colspec colname="c4" colwidth="6*" />
5387	          <spanspec namest="c1" nameend="c2" spanname="id" />
5388	          <spanspec namest="c2" nameend="c4" spanname="descr" />
5389	          <thead>
5390	            <row>
5391	              <entry spanname="id" align="left">ID</entry>
5392	              <entry align="left">Type</entry>
5393	            </row>
5394	            <row rowsep="1">
5395	              <entry spanname="descr" align="left">Description</entry>
5396	            </row>
5397	          </thead>
5398	          <tbody valign="top">
5399	            <row><entry></entry></row>
5400	            <row>
5401	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_CLASS</constant>&nbsp;</entry>
5402	              <entry>class</entry>
5403	            </row><row><entry spanname="descr">The RF_TUNER class
5404	descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
5405	description of this control class.</entry>
5406	            </row>
5407	            <row>
5408	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_BANDWIDTH_AUTO</constant>&nbsp;</entry>
5409	              <entry>boolean</entry>
5410	            </row>
5411	            <row>
5412	              <entry spanname="descr">Enables/disables tuner radio channel
5413	bandwidth configuration. In automatic mode bandwidth configuration is performed
5414	by the driver.</entry>
5415	            </row>
5416	            <row>
5417	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_BANDWIDTH</constant>&nbsp;</entry>
5418	              <entry>integer</entry>
5419	            </row>
5420	            <row>
5421	              <entry spanname="descr">Filter(s) on tuner signal path are used to
5422	filter signal according to receiving party needs. Driver configures filters to
5423	fulfill desired bandwidth requirement. Used when V4L2_CID_RF_TUNER_BANDWIDTH_AUTO is not
5424	set. Unit is in Hz. The range and step are driver-specific.</entry>
5425	            </row>
5426	            <row>
5427	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant>&nbsp;</entry>
5428	              <entry>boolean</entry>
5429	            </row>
5430	            <row>
5431	              <entry spanname="descr">Enables/disables LNA automatic gain control (AGC)</entry>
5432	            </row>
5433	            <row>
5434	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO</constant>&nbsp;</entry>
5435	              <entry>boolean</entry>
5436	            </row>
5437	            <row>
5438	              <entry spanname="descr">Enables/disables mixer automatic gain control (AGC)</entry>
5439	            </row>
5440	            <row>
5441	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_IF_GAIN_AUTO</constant>&nbsp;</entry>
5442	              <entry>boolean</entry>
5443	            </row>
5444	            <row>
5445	              <entry spanname="descr">Enables/disables IF automatic gain control (AGC)</entry>
5446	            </row>
5447	            <row>
5448	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_RF_GAIN</constant>&nbsp;</entry>
5449	              <entry>integer</entry>
5450	            </row>
5451	            <row>
5452	              <entry spanname="descr">The RF amplifier is the very first
5453	amplifier on the receiver signal path, just right after the antenna input.
5454	The difference between the LNA gain and the RF gain in this document is that
5455	the LNA gain is integrated in the tuner chip while the RF gain is a separate
5456	chip. There may be both RF and LNA gain controls in the same device.
5457	The range and step are driver-specific.</entry>
5458	            </row>
5459	            <row>
5460	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN</constant>&nbsp;</entry>
5461	              <entry>integer</entry>
5462	            </row>
5463	            <row>
5464	              <entry spanname="descr">LNA (low noise amplifier) gain is first
5465	gain stage on the RF tuner signal path. It is located very close to tuner
5466	antenna input. Used when <constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant> is not set.
5467	See <constant>V4L2_CID_RF_TUNER_RF_GAIN</constant> to understand how RF gain
5468	and LNA gain differs from the each others.
5469	The range and step are driver-specific.</entry>
5470	            </row>
5471	            <row>
5472	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_MIXER_GAIN</constant>&nbsp;</entry>
5473	              <entry>integer</entry>
5474	            </row>
5475	            <row>
5476	              <entry spanname="descr">Mixer gain is second gain stage on the RF
5477	tuner signal path. It is located inside mixer block, where RF signal is
5478	down-converted by the mixer. Used when <constant>V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO</constant>
5479	is not set. The range and step are driver-specific.</entry>
5480	            </row>
5481	            <row>
5482	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_IF_GAIN</constant>&nbsp;</entry>
5483	              <entry>integer</entry>
5484	            </row>
5485	            <row>
5486	              <entry spanname="descr">IF gain is last gain stage on the RF tuner
5487	signal path. It is located on output of RF tuner. It controls signal level of
5488	intermediate frequency output or baseband output. Used when
5489	<constant>V4L2_CID_RF_TUNER_IF_GAIN_AUTO</constant> is not set. The range and step are
5490	driver-specific.</entry>
5491	            </row>
5492	            <row>
5493	              <entry spanname="id"><constant>V4L2_CID_RF_TUNER_PLL_LOCK</constant>&nbsp;</entry>
5494	              <entry>boolean</entry>
5495	            </row>
5496	            <row>
5497	              <entry spanname="descr">Is synthesizer PLL locked? RF tuner is
5498	receiving given frequency when that control is set. This is a read-only control.
5499	</entry>
5500	            </row>
5501	          </tbody>
5502	        </tgroup>
5503	      </table>
5504	    </section>
5505	</section>
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.