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+ <section id="control">
+ <title>User Controls</title>
+
+ <para>Devices typically have a number of user-settable controls
+such as brightness, saturation and so on, which would be presented to
+the user on a graphical user interface. But, different devices
+will have different controls available, and furthermore, the range of
+possible values, and the default value will vary from device to
+device. The control ioctls provide the information and a mechanism to
+create a nice user interface for these controls that will work
+correctly with any device.</para>
+
+ <para>All controls are accessed using an ID value. V4L2 defines
+several IDs for specific purposes. Drivers can also implement their
+own custom controls using <constant>V4L2_CID_PRIVATE_BASE</constant>
+<footnote><para>The use of <constant>V4L2_CID_PRIVATE_BASE</constant>
+is problematic because different drivers may use the same
+<constant>V4L2_CID_PRIVATE_BASE</constant> ID for different controls.
+This makes it hard to programatically set such controls since the meaning
+of the control with that ID is driver dependent. In order to resolve this
+drivers use unique IDs and the <constant>V4L2_CID_PRIVATE_BASE</constant>
+IDs are mapped to those unique IDs by the kernel. Consider these
+<constant>V4L2_CID_PRIVATE_BASE</constant> IDs as aliases to the real
+IDs.</para>
+<para>Many applications today still use the <constant>V4L2_CID_PRIVATE_BASE</constant>
+IDs instead of using &VIDIOC-QUERYCTRL; with the <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>
+flag to enumerate all IDs, so support for <constant>V4L2_CID_PRIVATE_BASE</constant>
+is still around.</para></footnote>
+and higher values. The pre-defined control IDs have the prefix
+<constant>V4L2_CID_</constant>, and are listed in <xref
+linkend="control-id" />. The ID is used when querying the attributes of
+a control, and when getting or setting the current value.</para>
+
+ <para>Generally applications should present controls to the user
+without assumptions about their purpose. Each control comes with a
+name string the user is supposed to understand. When the purpose is
+non-intuitive the driver writer should provide a user manual, a user
+interface plug-in or a driver specific panel application. Predefined
+IDs were introduced to change a few controls programmatically, for
+example to mute a device during a channel switch.</para>
+
+ <para>Drivers may enumerate different controls after switching
+the current video input or output, tuner or modulator, or audio input
+or output. Different in the sense of other bounds, another default and
+current value, step size or other menu items. A control with a certain
+<emphasis>custom</emphasis> ID can also change name and
+type.</para>
+
+ <para>If a control is not applicable to the current configuration
+of the device (for example, it doesn't apply to the current video input)
+drivers set the <constant>V4L2_CTRL_FLAG_INACTIVE</constant> flag.</para>
+
+ <para>Control values are stored globally, they do not
+change when switching except to stay within the reported bounds. They
+also do not change &eg; when the device is opened or closed, when the
+tuner radio frequency is changed or generally never without
+application request.</para>
+
+ <para>V4L2 specifies an event mechanism to notify applications
+when controls change value (see &VIDIOC-SUBSCRIBE-EVENT;, event
+<constant>V4L2_EVENT_CTRL</constant>), panel applications might want to make
+use of that in order to always reflect the correct control value.</para>
+
+ <para>
+ All controls use machine endianness.
+ </para>
+
+ <table pgwide="1" frame="none" id="control-id">
+ <title>Control IDs</title>
+ <tgroup cols="3">
+ &cs-def;
+ <thead>
+ <row>
+ <entry>ID</entry>
+ <entry>Type</entry>
+ <entry>Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_CID_BASE</constant></entry>
+ <entry></entry>
+ <entry>First predefined ID, equal to
+<constant>V4L2_CID_BRIGHTNESS</constant>.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_USER_BASE</constant></entry>
+ <entry></entry>
+ <entry>Synonym of <constant>V4L2_CID_BASE</constant>.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_BRIGHTNESS</constant></entry>
+ <entry>integer</entry>
+ <entry>Picture brightness, or more precisely, the black
+level.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_CONTRAST</constant></entry>
+ <entry>integer</entry>
+ <entry>Picture contrast or luma gain.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_SATURATION</constant></entry>
+ <entry>integer</entry>
+ <entry>Picture color saturation or chroma gain.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_HUE</constant></entry>
+ <entry>integer</entry>
+ <entry>Hue or color balance.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUDIO_VOLUME</constant></entry>
+ <entry>integer</entry>
+ <entry>Overall audio volume. Note some drivers also
+provide an OSS or ALSA mixer interface.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUDIO_BALANCE</constant></entry>
+ <entry>integer</entry>
+ <entry>Audio stereo balance. Minimum corresponds to all
+the way left, maximum to right.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUDIO_BASS</constant></entry>
+ <entry>integer</entry>
+ <entry>Audio bass adjustment.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUDIO_TREBLE</constant></entry>
+ <entry>integer</entry>
+ <entry>Audio treble adjustment.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUDIO_MUTE</constant></entry>
+ <entry>boolean</entry>
+ <entry>Mute audio, &ie; set the volume to zero, however
+without affecting <constant>V4L2_CID_AUDIO_VOLUME</constant>. Like
+ALSA drivers, V4L2 drivers must mute at load time to avoid excessive
+noise. Actually the entire device should be reset to a low power
+consumption state.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUDIO_LOUDNESS</constant></entry>
+ <entry>boolean</entry>
+ <entry>Loudness mode (bass boost).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_BLACK_LEVEL</constant></entry>
+ <entry>integer</entry>
+ <entry>Another name for brightness (not a synonym of
+<constant>V4L2_CID_BRIGHTNESS</constant>). This control is deprecated
+and should not be used in new drivers and applications.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUTO_WHITE_BALANCE</constant></entry>
+ <entry>boolean</entry>
+ <entry>Automatic white balance (cameras).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_DO_WHITE_BALANCE</constant></entry>
+ <entry>button</entry>
+ <entry>This is an action control. When set (the value is
+ignored), the device will do a white balance and then hold the current
+setting. Contrast this with the boolean
+<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant>, which, when
+activated, keeps adjusting the white balance.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_RED_BALANCE</constant></entry>
+ <entry>integer</entry>
+ <entry>Red chroma balance.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_BLUE_BALANCE</constant></entry>
+ <entry>integer</entry>
+ <entry>Blue chroma balance.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_GAMMA</constant></entry>
+ <entry>integer</entry>
+ <entry>Gamma adjust.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_WHITENESS</constant></entry>
+ <entry>integer</entry>
+ <entry>Whiteness for grey-scale devices. This is a synonym
+for <constant>V4L2_CID_GAMMA</constant>. This control is deprecated
+and should not be used in new drivers and applications.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_EXPOSURE</constant></entry>
+ <entry>integer</entry>
+ <entry>Exposure (cameras). [Unit?]</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUTOGAIN</constant></entry>
+ <entry>boolean</entry>
+ <entry>Automatic gain/exposure control.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_GAIN</constant></entry>
+ <entry>integer</entry>
+ <entry>Gain control.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_HFLIP</constant></entry>
+ <entry>boolean</entry>
+ <entry>Mirror the picture horizontally.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_VFLIP</constant></entry>
+ <entry>boolean</entry>
+ <entry>Mirror the picture vertically.</entry>
+ </row>
+ <row id="v4l2-power-line-frequency">
+ <entry><constant>V4L2_CID_POWER_LINE_FREQUENCY</constant></entry>
+ <entry>enum</entry>
+ <entry>Enables a power line frequency filter to avoid
+flicker. Possible values for <constant>enum v4l2_power_line_frequency</constant> are:
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_DISABLED</constant> (0),
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1),
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2) and
+<constant>V4L2_CID_POWER_LINE_FREQUENCY_AUTO</constant> (3).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_HUE_AUTO</constant></entry>
+ <entry>boolean</entry>
+ <entry>Enables automatic hue control by the device. The
+effect of setting <constant>V4L2_CID_HUE</constant> while automatic
+hue control is enabled is undefined, drivers should ignore such
+request.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_WHITE_BALANCE_TEMPERATURE</constant></entry>
+ <entry>integer</entry>
+ <entry>This control specifies the white balance settings
+as a color temperature in Kelvin. A driver should have a minimum of
+2800 (incandescent) to 6500 (daylight). For more information about
+color temperature see <ulink
+url="http://en.wikipedia.org/wiki/Color_temperature">Wikipedia</ulink>.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_SHARPNESS</constant></entry>
+ <entry>integer</entry>
+ <entry>Adjusts the sharpness filters in a camera. The
+minimum value disables the filters, higher values give a sharper
+picture.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_BACKLIGHT_COMPENSATION</constant></entry>
+ <entry>integer</entry>
+ <entry>Adjusts the backlight compensation in a camera. The
+minimum value disables backlight compensation.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_CHROMA_AGC</constant></entry>
+ <entry>boolean</entry>
+ <entry>Chroma automatic gain control.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry>
+ <entry>integer</entry>
+ <entry>Adjusts the Chroma gain control (for use when chroma AGC
+ is disabled).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_COLOR_KILLER</constant></entry>
+ <entry>boolean</entry>
+ <entry>Enable the color killer (&ie; force a black &amp; white image in case of a weak video signal).</entry>
+ </row>
+ <row id="v4l2-colorfx">
+ <entry><constant>V4L2_CID_COLORFX</constant></entry>
+ <entry>enum</entry>
+ <entry>Selects a color effect. The following values are defined:
+ </entry>
+ </row><row>
+ <entry></entry>
+ <entry></entry>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_COLORFX_NONE</constant>&nbsp;</entry>
+ <entry>Color effect is disabled.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_ANTIQUE</constant>&nbsp;</entry>
+ <entry>An aging (old photo) effect.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_ART_FREEZE</constant>&nbsp;</entry>
+ <entry>Frost color effect.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_AQUA</constant>&nbsp;</entry>
+ <entry>Water color, cool tone.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_BW</constant>&nbsp;</entry>
+ <entry>Black and white.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_EMBOSS</constant>&nbsp;</entry>
+ <entry>Emboss, the highlights and shadows replace light/dark boundaries
+ and low contrast areas are set to a gray background.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_GRASS_GREEN</constant>&nbsp;</entry>
+ <entry>Grass green.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_NEGATIVE</constant>&nbsp;</entry>
+ <entry>Negative.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SEPIA</constant>&nbsp;</entry>
+ <entry>Sepia tone.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SKETCH</constant>&nbsp;</entry>
+ <entry>Sketch.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SKIN_WHITEN</constant>&nbsp;</entry>
+ <entry>Skin whiten.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SKY_BLUE</constant>&nbsp;</entry>
+ <entry>Sky blue.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SOLARIZATION</constant>&nbsp;</entry>
+ <entry>Solarization, the image is partially reversed in tone,
+ only color values above or below a certain threshold are inverted.
+ </entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SILHOUETTE</constant>&nbsp;</entry>
+ <entry>Silhouette (outline).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_VIVID</constant>&nbsp;</entry>
+ <entry>Vivid colors.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_COLORFX_SET_CBCR</constant>&nbsp;</entry>
+ <entry>The Cb and Cr chroma components are replaced by fixed
+ coefficients determined by <constant>V4L2_CID_COLORFX_CBCR</constant>
+ control.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_COLORFX_CBCR</constant></entry>
+ <entry>integer</entry>
+ <entry>Determines the Cb and Cr coefficients for <constant>V4L2_COLORFX_SET_CBCR</constant>
+ color effect. Bits [7:0] of the supplied 32 bit value are interpreted as
+ Cr component, bits [15:8] as Cb component and bits [31:16] must be zero.
+ </entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_AUTOBRIGHTNESS</constant></entry>
+ <entry>boolean</entry>
+ <entry>Enable Automatic Brightness.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_ROTATE</constant></entry>
+ <entry>integer</entry>
+ <entry>Rotates the image by specified angle. Common angles are 90,
+ 270 and 180. Rotating the image to 90 and 270 will reverse the height
+ and width of the display window. It is necessary to set the new height and
+ width of the picture using the &VIDIOC-S-FMT; ioctl according to
+ the rotation angle selected.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_BG_COLOR</constant></entry>
+ <entry>integer</entry>
+ <entry>Sets the background color on the current output device.
+ Background color needs to be specified in the RGB24 format. The
+ supplied 32 bit value is interpreted as bits 0-7 Red color information,
+ bits 8-15 Green color information, bits 16-23 Blue color
+ information and bits 24-31 must be zero.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_ILLUMINATORS_1</constant>
+ <constant>V4L2_CID_ILLUMINATORS_2</constant></entry>
+ <entry>boolean</entry>
+ <entry>Switch on or off the illuminator 1 or 2 of the device
+ (usually a microscope).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry>
+ <entry>integer</entry>
+ <entry>This is a read-only control that can be read by the application
+and used as a hint to determine the number of CAPTURE buffers to pass to REQBUFS.
+The value is the minimum number of CAPTURE buffers that is necessary for hardware
+to work.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_OUTPUT</constant></entry>
+ <entry>integer</entry>
+ <entry>This is a read-only control that can be read by the application
+and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS.
+The value is the minimum number of OUTPUT buffers that is necessary for hardware
+to work.</entry>
+ </row>
+ <row id="v4l2-alpha-component">
+ <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry>
+ <entry>integer</entry>
+ <entry>Sets the alpha color component. When a capture device (or
+ capture queue of a mem-to-mem device) produces a frame format that
+ includes an alpha component
+ (e.g. <link linkend="rgb-formats">packed RGB image formats</link>)
+ and the alpha value is not defined by the device or the mem-to-mem
+ input data this control lets you select the alpha component value of
+ all pixels. When an output device (or output queue of a mem-to-mem
+ device) consumes a frame format that doesn't include an alpha
+ component and the device supports alpha channel processing this
+ control lets you set the alpha component value of all pixels for
+ further processing in the device.
+ </entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_LASTP1</constant></entry>
+ <entry></entry>
+ <entry>End of the predefined control IDs (currently
+ <constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry>
+ <entry></entry>
+ <entry>ID of the first custom (driver specific) control.
+Applications depending on particular custom controls should check the
+driver name and version, see <xref linkend="querycap" />.</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ <para>Applications can enumerate the available controls with the
+&VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls, get and set a
+control value with the &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls.
+Drivers must implement <constant>VIDIOC_QUERYCTRL</constant>,
+<constant>VIDIOC_G_CTRL</constant> and
+<constant>VIDIOC_S_CTRL</constant> when the device has one or more
+controls, <constant>VIDIOC_QUERYMENU</constant> when it has one or
+more menu type controls.</para>
+
+ <example id="enum_all_controls">
+ <title>Enumerating all user controls</title>
+
+ <programlisting>
+&v4l2-queryctrl; queryctrl;
+&v4l2-querymenu; querymenu;
+
+static void enumerate_menu(void)
+{
+ printf(" Menu items:\n");
+
+ memset(&amp;querymenu, 0, sizeof(querymenu));
+ querymenu.id = queryctrl.id;
+
+ for (querymenu.index = queryctrl.minimum;
+ querymenu.index &lt;= queryctrl.maximum;
+ querymenu.index++) {
+ if (0 == ioctl(fd, &VIDIOC-QUERYMENU;, &amp;querymenu)) {
+ printf(" %s\n", querymenu.name);
+ }
+ }
+}
+
+memset(&amp;queryctrl, 0, sizeof(queryctrl));
+
+for (queryctrl.id = V4L2_CID_BASE;
+ queryctrl.id &lt; V4L2_CID_LASTP1;
+ queryctrl.id++) {
+ if (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
+ if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
+ continue;
+
+ printf("Control %s\n", queryctrl.name);
+
+ if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
+ enumerate_menu();
+ } else {
+ if (errno == EINVAL)
+ continue;
+
+ perror("VIDIOC_QUERYCTRL");
+ exit(EXIT_FAILURE);
+ }
+}
+
+for (queryctrl.id = V4L2_CID_PRIVATE_BASE;;
+ queryctrl.id++) {
+ if (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
+ if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
+ continue;
+
+ printf("Control %s\n", queryctrl.name);
+
+ if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
+ enumerate_menu();
+ } else {
+ if (errno == EINVAL)
+ break;
+
+ perror("VIDIOC_QUERYCTRL");
+ exit(EXIT_FAILURE);
+ }
+}
+</programlisting>
+ </example>
+
+ <example>
+ <title>Enumerating all user controls (alternative)</title>
+ <programlisting>
+memset(&amp;queryctrl, 0, sizeof(queryctrl));
+
+queryctrl.id = V4L2_CTRL_CLASS_USER | V4L2_CTRL_FLAG_NEXT_CTRL;
+while (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
+ if (V4L2_CTRL_ID2CLASS(queryctrl.id) != V4L2_CTRL_CLASS_USER)
+ break;
+ if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED)
+ continue;
+
+ printf("Control %s\n", queryctrl.name);
+
+ if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
+ enumerate_menu();
+
+ queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+}
+if (errno != EINVAL) {
+ perror("VIDIOC_QUERYCTRL");
+ exit(EXIT_FAILURE);
+}
+</programlisting>
+ </example>
+
+ <example>
+ <title>Changing controls</title>
+
+ <programlisting>
+&v4l2-queryctrl; queryctrl;
+&v4l2-control; control;
+
+memset(&amp;queryctrl, 0, sizeof(queryctrl));
+queryctrl.id = V4L2_CID_BRIGHTNESS;
+
+if (-1 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;queryctrl)) {
+ if (errno != EINVAL) {
+ perror("VIDIOC_QUERYCTRL");
+ exit(EXIT_FAILURE);
+ } else {
+ printf("V4L2_CID_BRIGHTNESS is not supported\n");
+ }
+} else if (queryctrl.flags &amp; V4L2_CTRL_FLAG_DISABLED) {
+ printf("V4L2_CID_BRIGHTNESS is not supported\n");
+} else {
+ memset(&amp;control, 0, sizeof (control));
+ control.id = V4L2_CID_BRIGHTNESS;
+ control.value = queryctrl.default_value;
+
+ if (-1 == ioctl(fd, &VIDIOC-S-CTRL;, &amp;control)) {
+ perror("VIDIOC_S_CTRL");
+ exit(EXIT_FAILURE);
+ }
+}
+
+memset(&amp;control, 0, sizeof(control));
+control.id = V4L2_CID_CONTRAST;
+
+if (0 == ioctl(fd, &VIDIOC-G-CTRL;, &amp;control)) {
+ control.value += 1;
+
+ /* The driver may clamp the value or return ERANGE, ignored here */
+
+ if (-1 == ioctl(fd, &VIDIOC-S-CTRL;, &amp;control)
+ &amp;&amp; errno != ERANGE) {
+ perror("VIDIOC_S_CTRL");
+ exit(EXIT_FAILURE);
+ }
+/* Ignore if V4L2_CID_CONTRAST is unsupported */
+} else if (errno != EINVAL) {
+ perror("VIDIOC_G_CTRL");
+ exit(EXIT_FAILURE);
+}
+
+control.id = V4L2_CID_AUDIO_MUTE;
+control.value = 1; /* silence */
+
+/* Errors ignored */
+ioctl(fd, VIDIOC_S_CTRL, &amp;control);
+</programlisting>
+ </example>
+ </section>
+
+ <section id="extended-controls">
+ <title>Extended Controls</title>
+
+ <section>
+ <title>Introduction</title>
+
+ <para>The control mechanism as originally designed was meant
+to be used for user settings (brightness, saturation, etc). However,
+it turned out to be a very useful model for implementing more
+complicated driver APIs where each driver implements only a subset of
+a larger API.</para>
+
+ <para>The MPEG encoding API was the driving force behind
+designing and implementing this extended control mechanism: the MPEG
+standard is quite large and the currently supported hardware MPEG
+encoders each only implement a subset of this standard. Further more,
+many parameters relating to how the video is encoded into an MPEG
+stream are specific to the MPEG encoding chip since the MPEG standard
+only defines the format of the resulting MPEG stream, not how the
+video is actually encoded into that format.</para>
+
+ <para>Unfortunately, the original control API lacked some
+features needed for these new uses and so it was extended into the
+(not terribly originally named) extended control API.</para>
+
+ <para>Even though the MPEG encoding API was the first effort
+to use the Extended Control API, nowadays there are also other classes
+of Extended Controls, such as Camera Controls and FM Transmitter Controls.
+The Extended Controls API as well as all Extended Controls classes are
+described in the following text.</para>
+ </section>
+
+ <section>
+ <title>The Extended Control API</title>
+
+ <para>Three new ioctls are available: &VIDIOC-G-EXT-CTRLS;,
+&VIDIOC-S-EXT-CTRLS; and &VIDIOC-TRY-EXT-CTRLS;. These ioctls act on
+arrays of controls (as opposed to the &VIDIOC-G-CTRL; and
+&VIDIOC-S-CTRL; ioctls that act on a single control). This is needed
+since it is often required to atomically change several controls at
+once.</para>
+
+ <para>Each of the new ioctls expects a pointer to a
+&v4l2-ext-controls;. This structure contains a pointer to the control
+array, a count of the number of controls in that array and a control
+class. Control classes are used to group similar controls into a
+single class. For example, control class
+<constant>V4L2_CTRL_CLASS_USER</constant> contains all user controls
+(&ie; all controls that can also be set using the old
+<constant>VIDIOC_S_CTRL</constant> ioctl). Control class
+<constant>V4L2_CTRL_CLASS_MPEG</constant> contains all controls
+relating to MPEG encoding, etc.</para>
+
+ <para>All controls in the control array must belong to the
+specified control class. An error is returned if this is not the
+case.</para>
+
+ <para>It is also possible to use an empty control array (count
+== 0) to check whether the specified control class is
+supported.</para>
+
+ <para>The control array is a &v4l2-ext-control; array. The
+<structname>v4l2_ext_control</structname> structure is very similar to
+&v4l2-control;, except for the fact that it also allows for 64-bit
+values and pointers to be passed.</para>
+
+ <para>Since the &v4l2-ext-control; supports pointers it is now
+also possible to have controls with compound types such as N-dimensional arrays
+and/or structures. You need to specify the <constant>V4L2_CTRL_FLAG_NEXT_COMPOUND</constant>
+when enumerating controls to actually be able to see such compound controls.
+In other words, these controls with compound types should only be used
+programmatically.</para>
+
+ <para>Since such compound controls need to expose more information
+about themselves than is possible with &VIDIOC-QUERYCTRL; the
+&VIDIOC-QUERY-EXT-CTRL; ioctl was added. In particular, this ioctl gives
+the dimensions of the N-dimensional array if this control consists of more than
+one element.</para>
+
+ <para>It is important to realize that due to the flexibility of
+controls it is necessary to check whether the control you want to set
+actually is supported in the driver and what the valid range of values
+is. So use the &VIDIOC-QUERYCTRL; (or &VIDIOC-QUERY-EXT-CTRL;) and
+&VIDIOC-QUERYMENU; ioctls to check this. Also note that it is possible
+that some of the menu indices in a control of type
+<constant>V4L2_CTRL_TYPE_MENU</constant> may not be supported
+(<constant>VIDIOC_QUERYMENU</constant> will return an error). A good
+example is the list of supported MPEG audio bitrates. Some drivers only
+support one or two bitrates, others support a wider range.</para>
+
+ <para>
+ All controls use machine endianness.
+ </para>
+ </section>
+
+ <section>
+ <title>Enumerating Extended Controls</title>
+
+ <para>The recommended way to enumerate over the extended
+controls is by using &VIDIOC-QUERYCTRL; in combination with the
+<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag:</para>
+
+ <informalexample>
+ <programlisting>
+&v4l2-queryctrl; qctrl;
+
+qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
+while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &amp;qctrl)) {
+ /* ... */
+ qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+}
+</programlisting>
+ </informalexample>
+
+ <para>The initial control ID is set to 0 ORed with the
+<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag. The
+<constant>VIDIOC_QUERYCTRL</constant> ioctl will return the first
+control with a higher ID than the specified one. When no such controls
+are found an error is returned.</para>
+
+ <para>If you want to get all controls within a specific control
+class, then you can set the initial
+<structfield>qctrl.id</structfield> value to the control class and add
+an extra check to break out of the loop when a control of another
+control class is found:</para>
+
+ <informalexample>
+ <programlisting>
+qctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CTRL_FLAG_NEXT_CTRL;
+while (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &amp;qctrl)) {
+ if (V4L2_CTRL_ID2CLASS(qctrl.id) != V4L2_CTRL_CLASS_MPEG)
+ break;
+ /* ... */
+ qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+}
+</programlisting>
+ </informalexample>
+
+ <para>The 32-bit <structfield>qctrl.id</structfield> value is
+subdivided into three bit ranges: the top 4 bits are reserved for
+flags (&eg; <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>) and are not
+actually part of the ID. The remaining 28 bits form the control ID, of
+which the most significant 12 bits define the control class and the
+least significant 16 bits identify the control within the control
+class. It is guaranteed that these last 16 bits are always non-zero
+for controls. The range of 0x1000 and up are reserved for
+driver-specific controls. The macro
+<constant>V4L2_CTRL_ID2CLASS(id)</constant> returns the control class
+ID based on a control ID.</para>
+
+ <para>If the driver does not support extended controls, then
+<constant>VIDIOC_QUERYCTRL</constant> will fail when used in
+combination with <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>. In
+that case the old method of enumerating control should be used (see
+<xref linkend="enum_all_controls" />). But if it is supported, then it is guaranteed to enumerate over
+all controls, including driver-private controls.</para>
+ </section>
+
+ <section>
+ <title>Creating Control Panels</title>
+
+ <para>It is possible to create control panels for a graphical
+user interface where the user can select the various controls.
+Basically you will have to iterate over all controls using the method
+described above. Each control class starts with a control of type
+<constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant>.
+<constant>VIDIOC_QUERYCTRL</constant> will return the name of this
+control class which can be used as the title of a tab page within a
+control panel.</para>
+
+ <para>The flags field of &v4l2-queryctrl; also contains hints on
+the behavior of the control. See the &VIDIOC-QUERYCTRL; documentation
+for more details.</para>
+ </section>
+
+ <section id="mpeg-controls">
+ <title>Codec Control Reference</title>
+
+ <para>Below all controls within the Codec control class are
+described. First the generic controls, then controls specific for
+certain hardware.</para>
+
+ <para>Note: These controls are applicable to all codecs and
+not just MPEG. The defines are prefixed with V4L2_CID_MPEG/V4L2_MPEG
+as the controls were originally made for MPEG codecs and later
+extended to cover all encoding formats.</para>
+
+ <section>
+ <title>Generic Codec Controls</title>
+
+ <table pgwide="1" frame="none" id="mpeg-control-id">
+ <title>Codec Control IDs</title>
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The Codec class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class. This description can be used as the
+caption of a Tab page in a GUI, for example.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-stream-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_stream_type</entry>
+ </row><row><entry spanname="descr">The MPEG-1, -2 or -4
+output stream type. One cannot assume anything here. Each hardware
+MPEG encoder tends to support different subsets of the available MPEG
+stream types. This control is specific to multiplexed MPEG streams.
+The currently defined stream types are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_PS</constant>&nbsp;</entry>
+ <entry>MPEG-2 program stream</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_TS</constant>&nbsp;</entry>
+ <entry>MPEG-2 transport stream</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_SS</constant>&nbsp;</entry>
+ <entry>MPEG-1 system stream</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_DVD</constant>&nbsp;</entry>
+ <entry>MPEG-2 DVD-compatible stream</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_VCD</constant>&nbsp;</entry>
+ <entry>MPEG-1 VCD-compatible stream</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD</constant>&nbsp;</entry>
+ <entry>MPEG-2 SVCD-compatible stream</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PMT</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Program Map Table
+Packet ID for the MPEG transport stream (default 16)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_AUDIO</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Audio Packet ID for
+the MPEG transport stream (default 256)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_VIDEO</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Video Packet ID for
+the MPEG transport stream (default 260)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PCR</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Packet ID for the
+MPEG transport stream carrying PCR fields (default 259)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_AUDIO</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Audio ID for MPEG
+PES</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_VIDEO</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Video ID for MPEG
+PES</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-stream-vbi-fmt">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_VBI_FMT</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_stream_vbi_fmt</entry>
+ </row><row><entry spanname="descr">Some cards can embed
+VBI data (&eg; Closed Caption, Teletext) into the MPEG stream. This
+control selects whether VBI data should be embedded, and if so, what
+embedding method should be used. The list of possible VBI formats
+depends on the driver. The currently defined VBI format types
+are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_NONE</constant>&nbsp;</entry>
+ <entry>No VBI in the MPEG stream</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant>&nbsp;</entry>
+ <entry>VBI in private packets, IVTV format (documented
+in the kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.vbi</filename>)</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-sampling-freq">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_sampling_freq</entry>
+ </row><row><entry spanname="descr">MPEG Audio sampling
+frequency. Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100</constant>&nbsp;</entry>
+ <entry>44.1 kHz</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000</constant>&nbsp;</entry>
+ <entry>48 kHz</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000</constant>&nbsp;</entry>
+ <entry>32 kHz</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-encoding">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_ENCODING</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_encoding</entry>
+ </row><row><entry spanname="descr">MPEG Audio encoding.
+This control is specific to multiplexed MPEG streams.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_1</constant>&nbsp;</entry>
+ <entry>MPEG-1/2 Layer I encoding</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_2</constant>&nbsp;</entry>
+ <entry>MPEG-1/2 Layer II encoding</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_3</constant>&nbsp;</entry>
+ <entry>MPEG-1/2 Layer III encoding</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant>&nbsp;</entry>
+ <entry>MPEG-2/4 AAC (Advanced Audio Coding)</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant>&nbsp;</entry>
+ <entry>AC-3 aka ATSC A/52 encoding</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-l1-bitrate">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L1_BITRATE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_l1_bitrate</entry>
+ </row><row><entry spanname="descr">MPEG-1/2 Layer I bitrate.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_32K</constant>&nbsp;</entry>
+ <entry>32 kbit/s</entry></row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_64K</constant>&nbsp;</entry>
+ <entry>64 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_96K</constant>&nbsp;</entry>
+ <entry>96 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_128K</constant>&nbsp;</entry>
+ <entry>128 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_160K</constant>&nbsp;</entry>
+ <entry>160 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_192K</constant>&nbsp;</entry>
+ <entry>192 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_224K</constant>&nbsp;</entry>
+ <entry>224 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_256K</constant>&nbsp;</entry>
+ <entry>256 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_288K</constant>&nbsp;</entry>
+ <entry>288 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_320K</constant>&nbsp;</entry>
+ <entry>320 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_352K</constant>&nbsp;</entry>
+ <entry>352 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_384K</constant>&nbsp;</entry>
+ <entry>384 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_416K</constant>&nbsp;</entry>
+ <entry>416 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_448K</constant>&nbsp;</entry>
+ <entry>448 kbit/s</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-l2-bitrate">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L2_BITRATE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_l2_bitrate</entry>
+ </row><row><entry spanname="descr">MPEG-1/2 Layer II bitrate.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_32K</constant>&nbsp;</entry>
+ <entry>32 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_48K</constant>&nbsp;</entry>
+ <entry>48 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_56K</constant>&nbsp;</entry>
+ <entry>56 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_64K</constant>&nbsp;</entry>
+ <entry>64 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_80K</constant>&nbsp;</entry>
+ <entry>80 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_96K</constant>&nbsp;</entry>
+ <entry>96 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_112K</constant>&nbsp;</entry>
+ <entry>112 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_128K</constant>&nbsp;</entry>
+ <entry>128 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_160K</constant>&nbsp;</entry>
+ <entry>160 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_192K</constant>&nbsp;</entry>
+ <entry>192 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_224K</constant>&nbsp;</entry>
+ <entry>224 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_256K</constant>&nbsp;</entry>
+ <entry>256 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_320K</constant>&nbsp;</entry>
+ <entry>320 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_384K</constant>&nbsp;</entry>
+ <entry>384 kbit/s</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-l3-bitrate">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L3_BITRATE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_l3_bitrate</entry>
+ </row><row><entry spanname="descr">MPEG-1/2 Layer III bitrate.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_32K</constant>&nbsp;</entry>
+ <entry>32 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_40K</constant>&nbsp;</entry>
+ <entry>40 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_48K</constant>&nbsp;</entry>
+ <entry>48 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_56K</constant>&nbsp;</entry>
+ <entry>56 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_64K</constant>&nbsp;</entry>
+ <entry>64 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_80K</constant>&nbsp;</entry>
+ <entry>80 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_96K</constant>&nbsp;</entry>
+ <entry>96 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_112K</constant>&nbsp;</entry>
+ <entry>112 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_128K</constant>&nbsp;</entry>
+ <entry>128 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_160K</constant>&nbsp;</entry>
+ <entry>160 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_192K</constant>&nbsp;</entry>
+ <entry>192 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_224K</constant>&nbsp;</entry>
+ <entry>224 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_256K</constant>&nbsp;</entry>
+ <entry>256 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_320K</constant>&nbsp;</entry>
+ <entry>320 kbit/s</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AAC_BITRATE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">AAC bitrate in bits per second.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-ac3-bitrate">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AC3_BITRATE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_ac3_bitrate</entry>
+ </row><row><entry spanname="descr">AC-3 bitrate.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_32K</constant>&nbsp;</entry>
+ <entry>32 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_40K</constant>&nbsp;</entry>
+ <entry>40 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_48K</constant>&nbsp;</entry>
+ <entry>48 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_56K</constant>&nbsp;</entry>
+ <entry>56 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_64K</constant>&nbsp;</entry>
+ <entry>64 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_80K</constant>&nbsp;</entry>
+ <entry>80 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_96K</constant>&nbsp;</entry>
+ <entry>96 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_112K</constant>&nbsp;</entry>
+ <entry>112 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_128K</constant>&nbsp;</entry>
+ <entry>128 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_160K</constant>&nbsp;</entry>
+ <entry>160 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_192K</constant>&nbsp;</entry>
+ <entry>192 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_224K</constant>&nbsp;</entry>
+ <entry>224 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_256K</constant>&nbsp;</entry>
+ <entry>256 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_320K</constant>&nbsp;</entry>
+ <entry>320 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_384K</constant>&nbsp;</entry>
+ <entry>384 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_448K</constant>&nbsp;</entry>
+ <entry>448 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_512K</constant>&nbsp;</entry>
+ <entry>512 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_576K</constant>&nbsp;</entry>
+ <entry>576 kbit/s</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_640K</constant>&nbsp;</entry>
+ <entry>640 kbit/s</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_mode</entry>
+ </row><row><entry spanname="descr">MPEG Audio mode.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_STEREO</constant>&nbsp;</entry>
+ <entry>Stereo</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_JOINT_STEREO</constant>&nbsp;</entry>
+ <entry>Joint Stereo</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_DUAL</constant>&nbsp;</entry>
+ <entry>Bilingual</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_MONO</constant>&nbsp;</entry>
+ <entry>Mono</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-mode-extension">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE_EXTENSION</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_mode_extension</entry>
+ </row><row><entry spanname="descr">Joint Stereo
+audio mode extension. In Layer I and II they indicate which subbands
+are in intensity stereo. All other subbands are coded in stereo. Layer
+III is not (yet) supported. Possible values
+are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4</constant>&nbsp;</entry>
+ <entry>Subbands 4-31 in intensity stereo</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8</constant>&nbsp;</entry>
+ <entry>Subbands 8-31 in intensity stereo</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12</constant>&nbsp;</entry>
+ <entry>Subbands 12-31 in intensity stereo</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16</constant>&nbsp;</entry>
+ <entry>Subbands 16-31 in intensity stereo</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-emphasis">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_EMPHASIS</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_emphasis</entry>
+ </row><row><entry spanname="descr">Audio Emphasis.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_NONE</constant>&nbsp;</entry>
+ <entry>None</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS</constant>&nbsp;</entry>
+ <entry>50/15 microsecond emphasis</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17</constant>&nbsp;</entry>
+ <entry>CCITT J.17</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-crc">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_CRC</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_crc</entry>
+ </row><row><entry spanname="descr">CRC method. Possible
+values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_CRC_NONE</constant>&nbsp;</entry>
+ <entry>None</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_CRC_CRC16</constant>&nbsp;</entry>
+ <entry>16 bit parity check</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MUTE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Mutes the audio when
+capturing. This is not done by muting audio hardware, which can still
+produce a slight hiss, but in the encoder itself, guaranteeing a fixed
+and reproducible audio bitstream. 0 = unmuted, 1 = muted.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-dec-playback">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
+ </row><row><entry spanname="descr">Determines how monolingual audio should be played back.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO</constant>&nbsp;</entry>
+ <entry>Automatically determines the best playback mode.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant>&nbsp;</entry>
+ <entry>Stereo playback.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant>&nbsp;</entry>
+ <entry>Left channel playback.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant>&nbsp;</entry>
+ <entry>Right channel playback.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant>&nbsp;</entry>
+ <entry>Mono playback.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant>&nbsp;</entry>
+ <entry>Stereo playback with swapped left and right channels.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-audio-dec-multilingual-playback">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_audio_dec_playback</entry>
+ </row><row><entry spanname="descr">Determines how multilingual audio should be played back.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-encoding">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ENCODING</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_encoding</entry>
+ </row><row><entry spanname="descr">MPEG Video encoding
+method. This control is specific to multiplexed MPEG streams.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_1</constant>&nbsp;</entry>
+ <entry>MPEG-1 Video encoding</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_2</constant>&nbsp;</entry>
+ <entry>MPEG-2 Video encoding</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant>&nbsp;</entry>
+ <entry>MPEG-4 AVC (H.264) Video encoding</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-aspect">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ASPECT</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_aspect</entry>
+ </row><row><entry spanname="descr">Video aspect.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ASPECT_1x1</constant>&nbsp;</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ASPECT_4x3</constant>&nbsp;</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ASPECT_16x9</constant>&nbsp;</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_ASPECT_221x100</constant>&nbsp;</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_B_FRAMES</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Number of B-Frames
+(default 2)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_SIZE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">GOP size (default
+12)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_CLOSURE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">GOP closure (default
+1)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_PULLDOWN</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Enable 3:2 pulldown
+(default 0)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-bitrate-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_bitrate_mode</entry>
+ </row><row><entry spanname="descr">Video bitrate mode.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_VBR</constant>&nbsp;</entry>
+ <entry>Variable bitrate</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_CBR</constant>&nbsp;</entry>
+ <entry>Constant bitrate</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Video bitrate in bits
+per second.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_PEAK</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Peak video bitrate in
+bits per second. Must be larger or equal to the average video bitrate.
+It is ignored if the video bitrate mode is set to constant
+bitrate.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">For every captured
+frame, skip this many subsequent frames (default 0).</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">"Mutes" the video to a
+fixed color when capturing. This is useful for testing, to produce a
+fixed video bitstream. 0 = unmuted, 1 = muted.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE_YUV</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Sets the "mute" color
+of the video. The supplied 32-bit integer is interpreted as follows (bit
+0 = least significant bit):</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry>Bit 0:7</entry>
+ <entry>V chrominance information</entry>
+ </row>
+ <row>
+ <entry>Bit 8:15</entry>
+ <entry>U chrominance information</entry>
+ </row>
+ <row>
+ <entry>Bit 16:23</entry>
+ <entry>Y luminance information</entry>
+ </row>
+ <row>
+ <entry>Bit 24:31</entry>
+ <entry>Must be zero.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-dec-pts">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant>&nbsp;</entry>
+ <entry>integer64</entry>
+ </row><row><entry spanname="descr">This read-only control returns the
+33-bit video Presentation Time Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of
+the currently displayed frame. This is the same PTS as is used in &VIDIOC-DECODER-CMD;.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-dec-frame">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant>&nbsp;</entry>
+ <entry>integer64</entry>
+ </row><row><entry spanname="descr">This read-only control returns the
+frame counter of the frame that is currently displayed (decoded). This value is reset to 0 whenever
+the decoder is started.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If enabled the decoder expects to receive a single slice per buffer, otherwise
+the decoder expects a single frame in per buffer. Applicable to the decoder, all codecs.
+</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enable writing sample aspect ratio in the Video Usability Information.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-vui-sar-idc">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_vui_sar_idc</entry>
+ </row>
+ <row><entry spanname="descr">VUI sample aspect ratio indicator for H.264 encoding. The value
+is defined in the table E-1 in the standard. Applicable to the H264 encoder.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_UNSPECIFIED</constant>&nbsp;</entry>
+ <entry>Unspecified</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1</constant>&nbsp;</entry>
+ <entry>1x1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11</constant>&nbsp;</entry>
+ <entry>12x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11</constant>&nbsp;</entry>
+ <entry>10x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11</constant>&nbsp;</entry>
+ <entry>16x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33</constant>&nbsp;</entry>
+ <entry>40x33</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11</constant>&nbsp;</entry>
+ <entry>24x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11</constant>&nbsp;</entry>
+ <entry>20x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11</constant>&nbsp;</entry>
+ <entry>32x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33</constant>&nbsp;</entry>
+ <entry>80x33</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11</constant>&nbsp;</entry>
+ <entry>18x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11</constant>&nbsp;</entry>
+ <entry>15x11</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33</constant>&nbsp;</entry>
+ <entry>64x33</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99</constant>&nbsp;</entry>
+ <entry>160x99</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3</constant>&nbsp;</entry>
+ <entry>4x3</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2</constant>&nbsp;</entry>
+ <entry>3x2</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1</constant>&nbsp;</entry>
+ <entry>2x1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED</constant>&nbsp;</entry>
+ <entry>Extended SAR</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Extended sample aspect ratio width for H.264 VUI encoding.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Extended sample aspect ratio height for H.264 VUI encoding.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-level">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LEVEL</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_level</entry>
+ </row>
+ <row><entry spanname="descr">The level information for the H264 video elementary stream.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_0</constant>&nbsp;</entry>
+ <entry>Level 1.0</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1B</constant>&nbsp;</entry>
+ <entry>Level 1B</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_1</constant>&nbsp;</entry>
+ <entry>Level 1.1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_2</constant>&nbsp;</entry>
+ <entry>Level 1.2</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_3</constant>&nbsp;</entry>
+ <entry>Level 1.3</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_0</constant>&nbsp;</entry>
+ <entry>Level 2.0</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_1</constant>&nbsp;</entry>
+ <entry>Level 2.1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_2</constant>&nbsp;</entry>
+ <entry>Level 2.2</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_0</constant>&nbsp;</entry>
+ <entry>Level 3.0</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_1</constant>&nbsp;</entry>
+ <entry>Level 3.1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_2</constant>&nbsp;</entry>
+ <entry>Level 3.2</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_0</constant>&nbsp;</entry>
+ <entry>Level 4.0</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_1</constant>&nbsp;</entry>
+ <entry>Level 4.1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_2</constant>&nbsp;</entry>
+ <entry>Level 4.2</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_0</constant>&nbsp;</entry>
+ <entry>Level 5.0</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_1</constant>&nbsp;</entry>
+ <entry>Level 5.1</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-mpeg4-level">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_mpeg4_level</entry>
+ </row>
+ <row><entry spanname="descr">The level information for the MPEG4 elementary stream.
+Applicable to the MPEG4 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0</constant>&nbsp;</entry>
+ <entry>Level 0</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0B</constant>&nbsp;</entry>
+ <entry>Level 0b</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_1</constant>&nbsp;</entry>
+ <entry>Level 1</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_2</constant>&nbsp;</entry>
+ <entry>Level 2</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3</constant>&nbsp;</entry>
+ <entry>Level 3</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3B</constant>&nbsp;</entry>
+ <entry>Level 3b</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_4</constant>&nbsp;</entry>
+ <entry>Level 4</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_LEVEL_5</constant>&nbsp;</entry>
+ <entry>Level 5</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-profile">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_PROFILE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_profile</entry>
+ </row>
+ <row><entry spanname="descr">The profile information for H264.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE</constant>&nbsp;</entry>
+ <entry>Baseline profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE</constant>&nbsp;</entry>
+ <entry>Constrained Baseline profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MAIN</constant>&nbsp;</entry>
+ <entry>Main profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED</constant>&nbsp;</entry>
+ <entry>Extended profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH</constant>&nbsp;</entry>
+ <entry>High profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10</constant>&nbsp;</entry>
+ <entry>High 10 profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422</constant>&nbsp;</entry>
+ <entry>High 422 profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE</constant>&nbsp;</entry>
+ <entry>High 444 Predictive profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA</constant>&nbsp;</entry>
+ <entry>High 10 Intra profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA</constant>&nbsp;</entry>
+ <entry>High 422 Intra profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA</constant>&nbsp;</entry>
+ <entry>High 444 Intra profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA</constant>&nbsp;</entry>
+ <entry>CAVLC 444 Intra profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE</constant>&nbsp;</entry>
+ <entry>Scalable Baseline profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH</constant>&nbsp;</entry>
+ <entry>Scalable High profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA</constant>&nbsp;</entry>
+ <entry>Scalable High Intra profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH</constant>&nbsp;</entry>
+ <entry>Stereo High profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH</constant>&nbsp;</entry>
+ <entry>Multiview High profile</entry>
+ </row>
+
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-mpeg4-profile">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_mpeg4_profile</entry>
+ </row>
+ <row><entry spanname="descr">The profile information for MPEG4.
+Applicable to the MPEG4 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE</constant>&nbsp;</entry>
+ <entry>Simple profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_SIMPLE</constant>&nbsp;</entry>
+ <entry>Advanced Simple profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_PROFILE_CORE</constant>&nbsp;</entry>
+ <entry>Core profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE_SCALABLE</constant>&nbsp;</entry>
+ <entry>Simple Scalable profile</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY</constant>&nbsp;</entry>
+ <entry></entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MAX_REF_PIC</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">The maximum number of reference pictures used for encoding.
+Applicable to the encoder.
+</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-multi-slice-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_multi_slice_mode</entry>
+ </row>
+ <row><entry spanname="descr">Determines how the encoder should handle division of frame into slices.
+Applicable to the encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE</constant>&nbsp;</entry>
+ <entry>Single slice per frame.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>&nbsp;</entry>
+ <entry>Multiple slices with set maximum number of macroblocks per slice.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>&nbsp;</entry>
+ <entry>Multiple slice with set maximum size in bytes per slice.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">The maximum number of macroblocks in a slice. Used when
+<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>.
+Applicable to the encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">The maximum size of a slice in bytes. Used when
+<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>.
+Applicable to the encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-loop-filter-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_loop_filter_mode</entry>
+ </row>
+ <row><entry spanname="descr">Loop filter mode for H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED</constant>&nbsp;</entry>
+ <entry>Loop filter is enabled.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED</constant>&nbsp;</entry>
+ <entry>Loop filter is disabled.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY</constant>&nbsp;</entry>
+ <entry>Loop filter is disabled at the slice boundary.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Loop filter alpha coefficient, defined in the H264 standard.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Loop filter beta coefficient, defined in the H264 standard.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-entropy-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_entropy_mode</entry>
+ </row>
+ <row><entry spanname="descr">Entropy coding mode for H264 - CABAC/CAVALC.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC</constant>&nbsp;</entry>
+ <entry>Use CAVLC entropy coding.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC</constant>&nbsp;</entry>
+ <entry>Use CABAC entropy coding.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enable 8X8 transform for H264. Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Cyclic intra macroblock refresh. This is the number of continuous macroblocks
+refreshed every frame. Each frame a successive set of macroblocks is refreshed until the cycle completes and starts from the
+top of the frame. Applicable to H264, H263 and MPEG4 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Frame level rate control enable.
+If this control is disabled then the quantization parameter for each frame type is constant and set with appropriate controls
+(e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>).
+If frame rate control is enabled then quantization parameter is adjusted to meet the chosen bitrate. Minimum and maximum value
+for the quantization parameter can be set with appropriate controls (e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>).
+Applicable to encoders.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Macroblock level rate control enable.
+Applicable to the MPEG4 and H264 encoders.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_QPEL</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an I frame for H263. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Minimum quantization parameter for H263. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MAX_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Maximum quantization parameter for H263. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an P frame for H263. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an B frame for H263. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an I frame for H264. Valid range: from 0 to 51.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MIN_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Minimum quantization parameter for H264. Valid range: from 0 to 51.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MAX_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Maximum quantization parameter for H264. Valid range: from 0 to 51.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an P frame for H264. Valid range: from 0 to 51.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an B frame for H264. Valid range: from 0 to 51.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an I frame for MPEG4. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Minimum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Maximum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an P frame for MPEG4. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an B frame for MPEG4. Valid range: from 1 to 31.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_SIZE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">The Video Buffer Verifier size in kilobytes, it is used as a limitation of frame skip.
+The VBV is defined in the standard as a mean to verify that the produced stream will be successfully decoded.
+The standard describes it as "Part of a hypothetical decoder that is conceptually connected to the
+output of the encoder. Its purpose is to provide a constraint on the variability of the data rate that an
+encoder or editing process may produce.".
+Applicable to the MPEG1, MPEG2, MPEG4 encoders.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-vbv-delay">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_DELAY</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Sets the initial delay in milliseconds for
+VBV buffer control.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-hor-search-range">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Horizontal search range defines maximum horizontal search area in pixels
+to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set
+horizontal search range for motion estimation module in video encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-vert-search-range">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Vertical search range defines maximum vertical search area in pixels
+to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set
+vertical search range for motion estimation module in video encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">The Coded Picture Buffer size in kilobytes, it is used as a limitation of frame skip.
+The CPB is defined in the H264 standard as a mean to verify that the produced stream will be successfully decoded.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_PERIOD</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Period between I-frames in the open GOP for H264. In case of an open GOP
+this is the period between two I-frames. The period between IDR (Instantaneous Decoding Refresh) frames is taken from the GOP_SIZE control.
+An IDR frame, which stands for Instantaneous Decoding Refresh is an I-frame after which no prior frames are
+referenced. This means that a stream can be restarted from an IDR frame without the need to store or decode any
+previous frames. Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-header-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_HEADER_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_header_mode</entry>
+ </row>
+ <row><entry spanname="descr">Determines whether the header is returned as the first buffer or is
+it returned together with the first frame. Applicable to encoders.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE</constant>&nbsp;</entry>
+ <entry>The stream header is returned separately in the first buffer.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME</constant>&nbsp;</entry>
+ <entry>The stream header is returned together with the first encoded frame.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Repeat the video sequence headers. Repeating these
+headers makes random access to the video stream easier. Applicable to the MPEG1, 2 and 4 encoder.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Enabled the deblocking post processing filter for MPEG4 decoder.
+Applicable to the MPEG4 decoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_RES</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">vop_time_increment_resolution value for MPEG4. Applicable to the MPEG4 encoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_INC</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">vop_time_increment value for MPEG4. Applicable to the MPEG4 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enable generation of frame packing supplemental enhancement information in the encoded bitstream.
+The frame packing SEI message contains the arrangement of L and R planes for 3D viewing. Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Sets current frame as frame0 in frame packing SEI.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-sei-fp-arrangement-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_sei_fp_arrangement_type</entry>
+ </row>
+ <row><entry spanname="descr">Frame packing arrangement type for H264 SEI.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD</constant>&nbsp;</entry>
+ <entry>Pixels are alternatively from L and R.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN</constant>&nbsp;</entry>
+ <entry>L and R are interlaced by column.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW</constant>&nbsp;</entry>
+ <entry>L and R are interlaced by row.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE</constant>&nbsp;</entry>
+ <entry>L is on the left, R on the right.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM</constant>&nbsp;</entry>
+ <entry>L is on top, R on bottom.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL</constant>&nbsp;</entry>
+ <entry>One view per frame.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enables flexible macroblock ordering in the encoded bitstream. It is a technique
+used for restructuring the ordering of macroblocks in pictures. Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-fmo-map-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_fmo_map_type</entry>
+ </row>
+ <row><entry spanname="descr">When using FMO, the map type divides the image in different scan patterns of macroblocks.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES</constant>&nbsp;</entry>
+ <entry>Slices are interleaved one after other with macroblocks in run length order.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES</constant>&nbsp;</entry>
+ <entry>Scatters the macroblocks based on a mathematical function known to both encoder and decoder.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER</constant>&nbsp;</entry>
+ <entry>Macroblocks arranged in rectangular areas or regions of interest.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT</constant>&nbsp;</entry>
+ <entry>Slice groups grow in a cyclic way from centre to outwards.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN</constant>&nbsp;</entry>
+ <entry>Slice groups grow in raster scan pattern from left to right.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN</constant>&nbsp;</entry>
+ <entry>Slice groups grow in wipe scan pattern from top to bottom.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT</constant>&nbsp;</entry>
+ <entry>User defined map type.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Number of slice groups in FMO.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-fmo-change-direction">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_fmo_change_dir</entry>
+ </row>
+ <row><entry spanname="descr">Specifies a direction of the slice group change for raster and wipe maps.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT</constant>&nbsp;</entry>
+ <entry>Raster scan or wipe right.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT</constant>&nbsp;</entry>
+ <entry>Reverse raster scan or wipe left.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Specifies the size of the first slice group for raster and wipe map.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Specifies the number of consecutive macroblocks for the interleaved map.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enables arbitrary slice ordering in encoded bitstream.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Specifies the slice order in ASO. Applicable to the H264 encoder.
+The supplied 32-bit integer is interpreted as follows (bit
+0 = least significant bit):</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry>Bit 0:15</entry>
+ <entry>Slice ID</entry>
+ </row>
+ <row>
+ <entry>Bit 16:32</entry>
+ <entry>Slice position or order</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enables H264 hierarchical coding.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-video-h264-hierarchical-coding-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_video_h264_hierarchical_coding_type</entry>
+ </row>
+ <row><entry spanname="descr">Specifies the hierarchical coding type.
+Applicable to the H264 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B</constant>&nbsp;</entry>
+ <entry>Hierarchical B coding.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P</constant>&nbsp;</entry>
+ <entry>Hierarchical P coding.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Specifies the number of hierarchical coding layers.
+Applicable to the H264 encoder.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Specifies a user defined QP for each layer. Applicable to the H264 encoder.
+The supplied 32-bit integer is interpreted as follows (bit
+0 = least significant bit):</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry>Bit 0:15</entry>
+ <entry>QP value</entry>
+ </row>
+ <row>
+ <entry>Bit 16:32</entry>
+ <entry>Layer number</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+
+ <section>
+ <title>MFC 5.1 MPEG Controls</title>
+
+ <para>The following MPEG class controls deal with MPEG
+decoding and encoding settings that are specific to the Multi Format Codec 5.1 device present
+in the S5P family of SoCs by Samsung.
+</para>
+
+ <table pgwide="1" frame="none" id="mfc51-control-id">
+ <title>MFC 5.1 Control IDs</title>
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY_ENABLE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">If the display delay is enabled then the decoder is forced to return a
+CAPTURE buffer (decoded frame) after processing a certain number of OUTPUT buffers. The delay can be set through
+<constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant>. This feature can be used for example
+for generating thumbnails of videos. Applicable to the H264 decoder.
+ </entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Display delay value for H264 decoder.
+The decoder is forced to return a decoded frame after the set 'display delay' number of frames. If this number is
+low it may result in frames returned out of dispaly order, in addition the hardware may still be using the returned buffer
+as a reference picture for subsequent frames.
+</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">The number of reference pictures used for encoding a P picture.
+Applicable to the H264 encoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Padding enable in the encoder - use a color instead of repeating border pixels.
+Applicable to encoders.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING_YUV</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Padding color in the encoder. Applicable to encoders. The supplied 32-bit integer is interpreted as follows (bit
+0 = least significant bit):</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry>Bit 0:7</entry>
+ <entry>V chrominance information</entry>
+ </row>
+ <row>
+ <entry>Bit 8:15</entry>
+ <entry>U chrominance information</entry>
+ </row>
+ <row>
+ <entry>Bit 16:23</entry>
+ <entry>Y luminance information</entry>
+ </row>
+ <row>
+ <entry>Bit 24:31</entry>
+ <entry>Must be zero.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_REACTION_COEFF</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Reaction coefficient for MFC rate control. Applicable to encoders.
+<para>Note 1: Valid only when the frame level RC is enabled.</para>
+<para>Note 2: For tight CBR, this field must be small (ex. 2 ~ 10).
+For VBR, this field must be large (ex. 100 ~ 1000).</para>
+<para>Note 3: It is not recommended to use the greater number than FRAME_RATE * (10^9 / BIT_RATE).</para>
+</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_DARK</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Adaptive rate control for dark region.
+Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
+Applicable to the H264 encoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_SMOOTH</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Adaptive rate control for smooth region.
+Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
+Applicable to the H264 encoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Adaptive rate control for static region.
+Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
+Applicable to the H264 encoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_ACTIVITY</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Adaptive rate control for activity region.
+Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>).
+Applicable to the H264 encoder.</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-mfc51-video-frame-skip-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_mfc51_video_frame_skip_mode</entry>
+ </row>
+ <row><entry spanname="descr">
+Indicates in what conditions the encoder should skip frames. If encoding a frame would cause the encoded stream to be larger then
+a chosen data limit then the frame will be skipped.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_DISABLED</constant>&nbsp;</entry>
+ <entry>Frame skip mode is disabled.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT</constant>&nbsp;</entry>
+ <entry>Frame skip mode enabled and buffer limit is set by the chosen level and is defined by the standard.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT</constant>&nbsp;</entry>
+ <entry>Frame skip mode enabled and buffer limit is set by the VBV (MPEG1/2/4) or CPB (H264) buffer size control.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_FIXED_TARGET_BIT</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Enable rate-control with fixed target bit.
+If this setting is enabled, then the rate control logic of the encoder will calculate the average bitrate
+for a GOP and keep it below or equal the set bitrate target. Otherwise the rate control logic calculates the
+overall average bitrate for the stream and keeps it below or equal to the set bitrate. In the first case
+the average bitrate for the whole stream will be smaller then the set bitrate. This is caused because the
+average is calculated for smaller number of frames, on the other hand enabling this setting will ensure that
+the stream will meet tight bandwidth contraints. Applicable to encoders.
+</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-mfc51-video-force-frame-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_mfc51_video_force_frame_type</entry>
+ </row>
+ <row><entry spanname="descr">Force a frame type for the next queued buffer. Applicable to encoders.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_DISABLED</constant>&nbsp;</entry>
+ <entry>Forcing a specific frame type disabled.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME</constant>&nbsp;</entry>
+ <entry>Force an I-frame.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED</constant>&nbsp;</entry>
+ <entry>Force a non-coded frame.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+
+ <section>
+ <title>CX2341x MPEG Controls</title>
+
+ <para>The following MPEG class controls deal with MPEG
+encoding settings that are specific to the Conexant CX23415 and
+CX23416 MPEG encoding chips.</para>
+
+ <table pgwide="1" frame="none" id="cx2341x-control-id">
+ <title>CX2341x Control IDs</title>
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-cx2341x-video-spatial-filter-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_cx2341x_video_spatial_filter_mode</entry>
+ </row><row><entry spanname="descr">Sets the Spatial
+Filter mode (default <constant>MANUAL</constant>). Possible values
+are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_MANUAL</constant>&nbsp;</entry>
+ <entry>Choose the filter manually</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO</constant>&nbsp;</entry>
+ <entry>Choose the filter automatically</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER</constant>&nbsp;</entry>
+ <entry>integer&nbsp;(0-15)</entry>
+ </row><row><entry spanname="descr">The setting for the
+Spatial Filter. 0 = off, 15 = maximum. (Default is 0.)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="luma-spatial-filter-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_cx2341x_video_luma_spatial_filter_type</entry>
+ </row><row><entry spanname="descr">Select the algorithm
+to use for the Luma Spatial Filter (default
+<constant>1D_HOR</constant>). Possible values:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_OFF</constant>&nbsp;</entry>
+ <entry>No filter</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR</constant>&nbsp;</entry>
+ <entry>One-dimensional horizontal</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT</constant>&nbsp;</entry>
+ <entry>One-dimensional vertical</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE</constant>&nbsp;</entry>
+ <entry>Two-dimensional separable</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE</constant>&nbsp;</entry>
+ <entry>Two-dimensional symmetrical
+non-separable</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="chroma-spatial-filter-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_cx2341x_video_chroma_spatial_filter_type</entry>
+ </row><row><entry spanname="descr">Select the algorithm
+for the Chroma Spatial Filter (default <constant>1D_HOR</constant>).
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_OFF</constant>&nbsp;</entry>
+ <entry>No filter</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR</constant>&nbsp;</entry>
+ <entry>One-dimensional horizontal</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-cx2341x-video-temporal-filter-mode">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_cx2341x_video_temporal_filter_mode</entry>
+ </row><row><entry spanname="descr">Sets the Temporal
+Filter mode (default <constant>MANUAL</constant>). Possible values
+are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_MANUAL</constant>&nbsp;</entry>
+ <entry>Choose the filter manually</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO</constant>&nbsp;</entry>
+ <entry>Choose the filter automatically</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER</constant>&nbsp;</entry>
+ <entry>integer&nbsp;(0-31)</entry>
+ </row><row><entry spanname="descr">The setting for the
+Temporal Filter. 0 = off, 31 = maximum. (Default is 8 for full-scale
+capturing and 0 for scaled capturing.)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row id="v4l2-mpeg-cx2341x-video-median-filter-type">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_mpeg_cx2341x_video_median_filter_type</entry>
+ </row><row><entry spanname="descr">Median Filter Type
+(default <constant>OFF</constant>). Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_OFF</constant>&nbsp;</entry>
+ <entry>No filter</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR</constant>&nbsp;</entry>
+ <entry>Horizontal filter</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT</constant>&nbsp;</entry>
+ <entry>Vertical filter</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT</constant>&nbsp;</entry>
+ <entry>Horizontal and vertical filter</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG</constant>&nbsp;</entry>
+ <entry>Diagonal filter</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_BOTTOM</constant>&nbsp;</entry>
+ <entry>integer&nbsp;(0-255)</entry>
+ </row><row><entry spanname="descr">Threshold above which
+the luminance median filter is enabled (default 0)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_TOP</constant>&nbsp;</entry>
+ <entry>integer&nbsp;(0-255)</entry>
+ </row><row><entry spanname="descr">Threshold below which
+the luminance median filter is enabled (default 255)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_BOTTOM</constant>&nbsp;</entry>
+ <entry>integer&nbsp;(0-255)</entry>
+ </row><row><entry spanname="descr">Threshold above which
+the chroma median filter is enabled (default 0)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_TOP</constant>&nbsp;</entry>
+ <entry>integer&nbsp;(0-255)</entry>
+ </row><row><entry spanname="descr">Threshold below which
+the chroma median filter is enabled (default 255)</entry>
+ </row>
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_STREAM_INSERT_NAV_PACKETS</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">The CX2341X MPEG encoder
+can insert one empty MPEG-2 PES packet into the stream between every
+four video frames. The packet size is 2048 bytes, including the
+packet_start_code_prefix and stream_id fields. The stream_id is 0xBF
+(private stream 2). The payload consists of 0x00 bytes, to be filled
+in by the application. 0 = do not insert, 1 = insert packets.</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+
+ <section>
+ <title>VPX Control Reference</title>
+
+ <para>The VPX controls include controls for encoding parameters
+ of VPx video codec.</para>
+
+ <table pgwide="1" frame="none" id="vpx-control-id">
+ <title>VPX Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-vpx-num-partitions">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS</constant></entry>
+ <entry>enum v4l2_vp8_num_partitions</entry>
+ </row>
+ <row><entry spanname="descr">The number of token partitions to use in VP8 encoder.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_1_PARTITION</constant></entry>
+ <entry>1 coefficient partition</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_2_PARTITIONS</constant></entry>
+ <entry>2 coefficient partitions</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_4_PARTITIONS</constant></entry>
+ <entry>4 coefficient partitions</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_8_PARTITIONS</constant></entry>
+ <entry>8 coefficient partitions</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4</constant></entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Setting this prevents intra 4x4 mode in the intra mode decision.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-vpx-num-ref-frames">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES</constant></entry>
+ <entry>enum v4l2_vp8_num_ref_frames</entry>
+ </row>
+ <row><entry spanname="descr">The number of reference pictures for encoding P frames.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_1_REF_FRAME</constant></entry>
+ <entry>Last encoded frame will be searched</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_2_REF_FRAME</constant></entry>
+ <entry>Two frames will be searched among the last encoded frame, the golden frame
+and the alternate reference (altref) frame. The encoder implementation will decide which two are chosen.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_3_REF_FRAME</constant></entry>
+ <entry>The last encoded frame, the golden frame and the altref frame will be searched.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Indicates the loop filter level. The adjustment of the loop
+filter level is done via a delta value against a baseline loop filter value.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">This parameter affects the loop filter. Anything above
+zero weakens the deblocking effect on the loop filter.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the refresh period for the golden frame. The period is defined
+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.
+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
+0, 4, 8 etc will be taken as the golden frames as frame 0 is always a key frame.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row id="v4l2-vpx-golden-frame-sel">
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL</constant></entry>
+ <entry>enum v4l2_vp8_golden_frame_sel</entry>
+ </row>
+ <row><entry spanname="descr">Selects the golden frame for encoding.
+Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_PREV</constant></entry>
+ <entry>Use the (n-2)th frame as a golden frame, current frame index being 'n'.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_REF_PERIOD</constant></entry>
+ <entry>Use the previous specific frame indicated by
+V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD as a golden frame.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_MIN_QP</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Minimum quantization parameter for VP8.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_MAX_QP</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Maximum quantization parameter for VP8.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for an I frame for VP8.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Quantization parameter for a P frame for VP8.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_PROFILE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Select the desired profile for VPx encoder.
+Acceptable values are 0, 1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3.</entry>
+ </row>
+
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
+ </section>
+
+ <section id="camera-controls">
+ <title>Camera Control Reference</title>
+
+ <para>The Camera class includes controls for mechanical (or
+equivalent digital) features of a device such as controllable lenses
+or sensors.</para>
+
+ <table pgwide="1" frame="none" id="camera-control-id">
+ <title>Camera Control IDs</title>
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_CAMERA_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The Camera class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-exposure-auto-type">
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_exposure_auto_type</entry>
+ </row><row><entry spanname="descr">Enables automatic
+adjustments of the exposure time and/or iris aperture. The effect of
+manual changes of the exposure time or iris aperture while these
+features are enabled is undefined, drivers should ignore such
+requests. Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_EXPOSURE_AUTO</constant>&nbsp;</entry>
+ <entry>Automatic exposure time, automatic iris
+aperture.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_MANUAL</constant>&nbsp;</entry>
+ <entry>Manual exposure time, manual iris.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_SHUTTER_PRIORITY</constant>&nbsp;</entry>
+ <entry>Manual exposure time, auto iris.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_APERTURE_PRIORITY</constant>&nbsp;</entry>
+ <entry>Auto exposure time, manual iris.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_ABSOLUTE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Determines the exposure
+time of the camera sensor. The exposure time is limited by the frame
+interval. Drivers should interpret the values as 100 &micro;s units,
+where the value 1 stands for 1/10000th of a second, 10000 for 1 second
+and 100000 for 10 seconds.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO_PRIORITY</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">When
+<constant>V4L2_CID_EXPOSURE_AUTO</constant> is set to
+<constant>AUTO</constant> or <constant>APERTURE_PRIORITY</constant>,
+this control determines if the device may dynamically vary the frame
+rate. By default this feature is disabled (0) and the frame rate must
+remain constant.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant>&nbsp;</entry>
+ <entry>integer menu</entry>
+ </row><row><entry spanname="descr"> Determines the automatic
+exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant>
+control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant>
+or <constant>APERTURE_PRIORITY</constant>.
+It is expressed in terms of EV, drivers should interpret the values as 0.001 EV
+units, where the value 1000 stands for +1 EV.
+<para>Increasing the exposure compensation value is equivalent to decreasing
+the exposure value (EV) and will increase the amount of light at the image
+sensor. The camera performs the exposure compensation by adjusting absolute
+exposure time and/or aperture.</para></entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-exposure-metering">
+ <entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_exposure_metering</entry>
+ </row><row><entry spanname="descr">Determines how the camera measures
+the amount of light available for the frame exposure. Possible values are:</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant>&nbsp;</entry>
+ <entry>Use the light information coming from the entire frame
+and average giving no weighting to any particular portion of the metered area.
+ </entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant>&nbsp;</entry>
+ <entry>Average the light information coming from the entire frame
+giving priority to the center of the metered area.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant>&nbsp;</entry>
+ <entry>Measure only very small area at the center of the frame.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_EXPOSURE_METERING_MATRIX</constant>&nbsp;</entry>
+ <entry>A multi-zone metering. The light intensity is measured
+in several points of the frame and the the results are combined. The
+algorithm of the zones selection and their significance in calculating the
+final value is device dependent.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control turns the
+camera horizontally by the specified amount. The unit is undefined. A
+positive value moves the camera to the right (clockwise when viewed
+from above), a negative value to the left. A value of zero does not
+cause motion. This is a write-only control.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TILT_RELATIVE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control turns the
+camera vertically by the specified amount. The unit is undefined. A
+positive value moves the camera up, a negative value down. A value of
+zero does not cause motion. This is a write-only control.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PAN_RESET</constant>&nbsp;</entry>
+ <entry>button</entry>
+ </row><row><entry spanname="descr">When this control is set,
+the camera moves horizontally to the default position.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TILT_RESET</constant>&nbsp;</entry>
+ <entry>button</entry>
+ </row><row><entry spanname="descr">When this control is set,
+the camera moves vertically to the default position.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PAN_ABSOLUTE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control
+turns the camera horizontally to the specified position. Positive
+values move the camera to the right (clockwise when viewed from above),
+negative values to the left. Drivers should interpret the values as arc
+seconds, with valid values between -180 * 3600 and +180 * 3600
+inclusive.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TILT_ABSOLUTE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control
+turns the camera vertically to the specified position. Positive values
+move the camera up, negative values down. Drivers should interpret the
+values as arc seconds, with valid values between -180 * 3600 and +180
+* 3600 inclusive.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FOCUS_ABSOLUTE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control sets the
+focal point of the camera to the specified position. The unit is
+undefined. Positive values set the focus closer to the camera,
+negative values towards infinity.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FOCUS_RELATIVE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control moves the
+focal point of the camera by the specified amount. The unit is
+undefined. Positive values move the focus closer to the camera,
+negative values towards infinity. This is a write-only control.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FOCUS_AUTO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Enables continuous automatic
+focus adjustments. The effect of manual focus adjustments while this feature
+is enabled is undefined, drivers should ignore such requests.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_START</constant>&nbsp;</entry>
+ <entry>button</entry>
+ </row><row><entry spanname="descr">Starts single auto focus process.
+The effect of setting this control when <constant>V4L2_CID_FOCUS_AUTO</constant>
+is set to <constant>TRUE</constant> (1) is undefined, drivers should ignore
+such requests.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_STOP</constant>&nbsp;</entry>
+ <entry>button</entry>
+ </row><row><entry spanname="descr">Aborts automatic focusing
+started with <constant>V4L2_CID_AUTO_FOCUS_START</constant> control. It is
+effective only when the continuous autofocus is disabled, that is when
+<constant>V4L2_CID_FOCUS_AUTO</constant> control is set to <constant>FALSE
+</constant> (0).</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-auto-focus-status">
+ <entry spanname="id">
+ <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant>&nbsp;</entry>
+ <entry>bitmask</entry>
+ </row>
+ <row><entry spanname="descr">The automatic focus status. This is a read-only
+ control.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_STATUS_IDLE</constant>&nbsp;</entry>
+ <entry>Automatic focus is not active.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_STATUS_BUSY</constant>&nbsp;</entry>
+ <entry>Automatic focusing is in progress.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_STATUS_REACHED</constant>&nbsp;</entry>
+ <entry>Focus has been reached.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_STATUS_FAILED</constant>&nbsp;</entry>
+ <entry>Automatic focus has failed, the driver will not
+ transition from this state until another action is
+ performed by an application.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry spanname="descr">
+Setting <constant>V4L2_LOCK_FOCUS</constant> lock bit of the <constant>V4L2_CID_3A_LOCK
+</constant> control may stop updates of the <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant>
+control value.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-auto-focus-range">
+ <entry spanname="id">
+ <constant>V4L2_CID_AUTO_FOCUS_RANGE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_auto_focus_range</entry>
+ </row>
+ <row><entry spanname="descr">Determines auto focus distance range
+for which lens may be adjusted. </entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_RANGE_AUTO</constant>&nbsp;</entry>
+ <entry>The camera automatically selects the focus range.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_RANGE_NORMAL</constant>&nbsp;</entry>
+ <entry>Normal distance range, limited for best automatic focus
+performance.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_RANGE_MACRO</constant>&nbsp;</entry>
+ <entry>Macro (close-up) auto focus. The camera will
+use its minimum possible distance for auto focus.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_AUTO_FOCUS_RANGE_INFINITY</constant>&nbsp;</entry>
+ <entry>The lens is set to focus on an object at infinite distance.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_ZOOM_ABSOLUTE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Specify the objective lens
+focal length as an absolute value. The zoom unit is driver-specific and its
+value should be a positive integer.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_ZOOM_RELATIVE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Specify the objective lens
+focal length relatively to the current value. Positive values move the zoom
+lens group towards the telephoto direction, negative values towards the
+wide-angle direction. The zoom unit is driver-specific. This is a write-only control.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_ZOOM_CONTINUOUS</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Move the objective lens group
+at the specified speed until it reaches physical device limits or until an
+explicit request to stop the movement. A positive value moves the zoom lens
+group towards the telephoto direction. A value of zero stops the zoom lens
+group movement. A negative value moves the zoom lens group towards the
+wide-angle direction. The zoom speed unit is driver-specific.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_IRIS_ABSOLUTE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control sets the
+camera's aperture to the specified value. The unit is undefined.
+Larger values open the iris wider, smaller values close it.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_IRIS_RELATIVE</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control modifies the
+camera's aperture by the specified amount. The unit is undefined.
+Positive values open the iris one step further, negative values close
+it one step further. This is a write-only control.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PRIVACY</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Prevent video from being acquired
+by the camera. When this control is set to <constant>TRUE</constant> (1), no
+image can be captured by the camera. Common means to enforce privacy are
+mechanical obturation of the sensor and firmware image processing, but the
+device is not restricted to these methods. Devices that implement the privacy
+control must support read access and may support write access.</entry>
+ </row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_BAND_STOP_FILTER</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">Switch the band-stop filter of a
+camera sensor on or off, or specify its strength. Such band-stop filters can
+be used, for example, to filter out the fluorescent light component.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-auto-n-preset-white-balance">
+ <entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_auto_n_preset_white_balance</entry>
+ </row><row><entry spanname="descr">Sets white balance to automatic,
+manual or a preset. The presets determine color temperature of the light as
+a hint to the camera for white balance adjustments resulting in most accurate
+color representation. The following white balance presets are listed in order
+of increasing color temperature.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant>&nbsp;</entry>
+ <entry>Manual white balance.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant>&nbsp;</entry>
+ <entry>Automatic white balance adjustments.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant>&nbsp;</entry>
+ <entry>White balance setting for incandescent (tungsten) lighting.
+It generally cools down the colors and corresponds approximately to 2500...3500 K
+color temperature range.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant>&nbsp;</entry>
+ <entry>White balance preset for fluorescent lighting.
+It corresponds approximately to 4000...5000 K color temperature.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant>&nbsp;</entry>
+ <entry>With this setting the camera will compensate for
+fluorescent H lighting.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant>&nbsp;</entry>
+ <entry>White balance setting for horizon daylight.
+It corresponds approximately to 5000 K color temperature.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_DAYLIGHT</constant>&nbsp;</entry>
+ <entry>White balance preset for daylight (with clear sky).
+It corresponds approximately to 5000...6500 K color temperature.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_FLASH</constant>&nbsp;</entry>
+ <entry>With this setting the camera will compensate for the flash
+light. It slightly warms up the colors and corresponds roughly to 5000...5500 K
+color temperature.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_CLOUDY</constant>&nbsp;</entry>
+ <entry>White balance preset for moderately overcast sky.
+This option corresponds approximately to 6500...8000 K color temperature
+range.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_WHITE_BALANCE_SHADE</constant>&nbsp;</entry>
+ <entry>White balance preset for shade or heavily overcast
+sky. It corresponds approximately to 9000...10000 K color temperature.
+</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-wide-dynamic-range">
+ <entry spanname="id"><constant>V4L2_CID_WIDE_DYNAMIC_RANGE</constant></entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Enables or disables the camera's wide dynamic
+range feature. This feature allows to obtain clear images in situations where
+intensity of the illumination varies significantly throughout the scene, i.e.
+there are simultaneously very dark and very bright areas. It is most commonly
+realized in cameras by combining two subsequent frames with different exposure
+times. <footnote id="ctypeconv"><para> This control may be changed to a menu
+control in the future, if more options are required.</para></footnote></entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-image-stabilization">
+ <entry spanname="id"><constant>V4L2_CID_IMAGE_STABILIZATION</constant></entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Enables or disables image stabilization.
+ <footnoteref linkend="ctypeconv"/></entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY</constant>&nbsp;</entry>
+ <entry>integer menu</entry>
+ </row><row><entry spanname="descr">Determines ISO equivalent of an
+image sensor indicating the sensor's sensitivity to light. The numbers are
+expressed in arithmetic scale, as per <xref linkend="iso12232" /> standard,
+where doubling the sensor sensitivity is represented by doubling the numerical
+ISO value. Applications should interpret the values as standard ISO values
+multiplied by 1000, e.g. control value 800 stands for ISO 0.8. Drivers will
+usually support only a subset of standard ISO values. The effect of setting
+this control while the <constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>
+control is set to a value other than <constant>V4L2_CID_ISO_SENSITIVITY_MANUAL
+</constant> is undefined, drivers should ignore such requests.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-iso-sensitivity-auto-type">
+ <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_iso_sensitivity_type</entry>
+ </row><row><entry spanname="descr">Enables or disables automatic ISO
+sensitivity adjustments.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_CID_ISO_SENSITIVITY_MANUAL</constant>&nbsp;</entry>
+ <entry>Manual ISO sensitivity.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>&nbsp;</entry>
+ <entry>Automatic ISO sensitivity adjustments.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
+ <row id="v4l2-scene-mode">
+ <entry spanname="id"><constant>V4L2_CID_SCENE_MODE</constant>&nbsp;</entry>
+ <entry>enum&nbsp;v4l2_scene_mode</entry>
+ </row><row><entry spanname="descr">This control allows to select
+scene programs as the camera automatic modes optimized for common shooting
+scenes. Within these modes the camera determines best exposure, aperture,
+focusing, light metering, white balance and equivalent sensitivity. The
+controls of those parameters are influenced by the scene mode control.
+An exact behavior in each mode is subject to the camera specification.
+
+<para>When the scene mode feature is not used, this control should be set to
+<constant>V4L2_SCENE_MODE_NONE</constant> to make sure the other possibly
+related controls are accessible. The following scene programs are defined:
+</para>
+</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_NONE</constant>&nbsp;</entry>
+ <entry>The scene mode feature is disabled.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_BACKLIGHT</constant>&nbsp;</entry>
+ <entry>Backlight. Compensates for dark shadows when light is
+ coming from behind a subject, also by automatically turning
+ on the flash.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_BEACH_SNOW</constant>&nbsp;</entry>
+ <entry>Beach and snow. This mode compensates for all-white or
+bright scenes, which tend to look gray and low contrast, when camera's automatic
+exposure is based on an average scene brightness. To compensate, this mode
+automatically slightly overexposes the frames. The white balance may also be
+adjusted to compensate for the fact that reflected snow looks bluish rather
+than white.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_CANDLELIGHT</constant>&nbsp;</entry>
+ <entry>Candle light. The camera generally raises the ISO
+sensitivity and lowers the shutter speed. This mode compensates for relatively
+close subject in the scene. The flash is disabled in order to preserve the
+ambiance of the light.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_DAWN_DUSK</constant>&nbsp;</entry>
+ <entry>Dawn and dusk. Preserves the colors seen in low
+natural light before dusk and after down. The camera may turn off the flash,
+and automatically focus at infinity. It will usually boost saturation and
+lower the shutter speed.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_FALL_COLORS</constant>&nbsp;</entry>
+ <entry>Fall colors. Increases saturation and adjusts white
+balance for color enhancement. Pictures of autumn leaves get saturated reds
+and yellows.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_FIREWORKS</constant>&nbsp;</entry>
+ <entry>Fireworks. Long exposure times are used to capture
+the expanding burst of light from a firework. The camera may invoke image
+stabilization.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_LANDSCAPE</constant>&nbsp;</entry>
+ <entry>Landscape. The camera may choose a small aperture to
+provide deep depth of field and long exposure duration to help capture detail
+in dim light conditions. The focus is fixed at infinity. Suitable for distant
+and wide scenery.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_NIGHT</constant>&nbsp;</entry>
+ <entry>Night, also known as Night Landscape. Designed for low
+light conditions, it preserves detail in the dark areas without blowing out bright
+objects. The camera generally sets itself to a medium-to-high ISO sensitivity,
+with a relatively long exposure time, and turns flash off. As such, there will be
+increased image noise and the possibility of blurred image.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_PARTY_INDOOR</constant>&nbsp;</entry>
+ <entry>Party and indoor. Designed to capture indoor scenes
+that are lit by indoor background lighting as well as the flash. The camera
+usually increases ISO sensitivity, and adjusts exposure for the low light
+conditions.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_PORTRAIT</constant>&nbsp;</entry>
+ <entry>Portrait. The camera adjusts the aperture so that the
+depth of field is reduced, which helps to isolate the subject against a smooth
+background. Most cameras recognize the presence of faces in the scene and focus
+on them. The color hue is adjusted to enhance skin tones. The intensity of the
+flash is often reduced.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_SPORTS</constant>&nbsp;</entry>
+ <entry>Sports. Significantly increases ISO and uses a fast
+shutter speed to freeze motion of rapidly-moving subjects. Increased image
+noise may be seen in this mode.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_SUNSET</constant>&nbsp;</entry>
+ <entry>Sunset. Preserves deep hues seen in sunsets and
+sunrises. It bumps up the saturation.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_SCENE_MODE_TEXT</constant>&nbsp;</entry>
+ <entry>Text. It applies extra contrast and sharpness, it is
+typically a black-and-white mode optimized for readability. Automatic focus
+may be switched to close-up mode and this setting may also involve some
+lens-distortion correction.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_3A_LOCK</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">This control locks or unlocks the automatic
+focus, exposure and white balance. The automatic adjustments can be paused
+independently by setting the corresponding lock bit to 1. The camera then retains
+the settings until the lock bit is cleared. The following lock bits are defined:
+</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_LOCK_EXPOSURE</constant></entry>
+ <entry>Automatic exposure adjustments lock.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_LOCK_WHITE_BALANCE</constant></entry>
+ <entry>Automatic white balance adjustments lock.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_LOCK_FOCUS</constant></entry>
+ <entry>Automatic focus lock.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry spanname="descr">
+When a given algorithm is not enabled, drivers should ignore requests
+to lock it and should return no error. An example might be an application
+setting bit <constant>V4L2_LOCK_WHITE_BALANCE</constant> when the
+<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant> control is set to
+<constant>FALSE</constant>. The value of this control may be changed
+by exposure, white balance or focus controls.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PAN_SPEED</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control turns the
+camera horizontally at the specific speed. The unit is undefined. A
+positive value moves the camera to the right (clockwise when viewed
+from above), a negative value to the left. A value of zero stops the motion
+if one is in progress and has no effect otherwise.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TILT_SPEED</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row><row><entry spanname="descr">This control turns the
+camera vertically at the specified speed. The unit is undefined. A
+positive value moves the camera up, a negative value down. A value of zero
+stops the motion if one is in progress and has no effect otherwise.</entry>
+ </row>
+ <row><entry></entry></row>
+
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+
+ <section id="fm-tx-controls">
+ <title>FM Transmitter Control Reference</title>
+
+ <para>The FM Transmitter (FM_TX) class includes controls for common features of
+FM transmissions capable devices. Currently this class includes parameters for audio
+compression, pilot tone generation, audio deviation limiter, RDS transmission and
+tuning power features.</para>
+
+ <table pgwide="1" frame="none" id="fm-tx-control-id">
+ <title>FM_TX Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FM_TX_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The FM_TX class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_DEVIATION</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Configures RDS signal frequency deviation level in Hz.
+The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_PI</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the RDS Programme Identification field
+for transmission.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_PTY</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the RDS Programme Type field for transmission.
+This encodes up to 31 pre-defined programme types.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_PS_NAME</constant>&nbsp;</entry>
+ <entry>string</entry>
+ </row>
+ <row><entry spanname="descr">Sets the Programme Service name (PS_NAME) for transmission.
+It is intended for static display on a receiver. It is the primary aid to listeners in programme service
+identification and selection. In Annex E of <xref linkend="iec62106" />, the RDS specification,
+there is a full description of the correct character encoding for Programme Service name strings.
+Also from RDS specification, PS is usually a single eight character text. However, it is also possible
+to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured
+with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_RADIO_TEXT</constant>&nbsp;</entry>
+ <entry>string</entry>
+ </row>
+ <row><entry spanname="descr">Sets the Radio Text info for transmission. It is a textual description of
+what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names,
+programme-related information or any other text. In these cases, RadioText should be used in addition to
+<constant>V4L2_CID_RDS_TX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described
+in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being
+used to transmit it, either 32 (2A block) or 64 (2B block). However, it is also possible
+to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured
+with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_MONO_STEREO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Sets the Mono/Stereo bit of the Decoder Identification code. If set,
+then the audio was recorded as stereo.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_ARTIFICIAL_HEAD</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Sets the
+<ulink url="http://en.wikipedia.org/wiki/Artificial_head">Artificial Head</ulink> bit of the Decoder
+Identification code. If set, then the audio was recorded using an artificial head.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_COMPRESSED</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Sets the Compressed bit of the Decoder Identification code. If set,
+then the audio is compressed.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_DYNAMIC_PTY</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Sets the Dynamic PTY bit of the Decoder Identification code. If set,
+then the PTY code is dynamically switched.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_TRAFFIC_ANNOUNCEMENT</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then a traffic announcement is in progress.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_TRAFFIC_PROGRAM</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then the tuned programme carries traffic announcements.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_MUSIC_SPEECH</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then this channel broadcasts music. If cleared, then it
+broadcasts speech. If the transmitter doesn't make this distinction, then it should be set.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_ALT_FREQS_ENABLE</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then transmit alternate frequencies.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_TX_ALT_FREQS</constant>&nbsp;</entry>
+ <entry>__u32 array</entry>
+ </row>
+ <row><entry spanname="descr">The alternate frequencies in kHz units. The RDS standard allows
+for up to 25 frequencies to be defined. Drivers may support fewer frequencies so check
+the array size.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_ENABLED</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enables or disables the audio deviation limiter feature.
+The limiter is useful when trying to maximize the audio volume, minimize receiver-generated
+distortion and prevent overmodulation.
+</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_RELEASE_TIME</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the audio deviation limiter feature release time.
+Unit is in useconds. Step and range are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_DEVIATION</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Configures audio frequency deviation level in Hz.
+The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ENABLED</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enables or disables the audio compression feature.
+This feature amplifies signals below the threshold by a fixed gain and compresses audio
+signals above the threshold by the ratio of Threshold/(Gain + Threshold).</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_GAIN</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the gain for audio compression feature. It is
+a dB value. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_THRESHOLD</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the threshold level for audio compression freature.
+It is a dB value. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the attack time for audio compression feature.
+It is a useconds value. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the release time for audio compression feature.
+It is a useconds value. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_ENABLED</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enables or disables the pilot tone generation feature.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_DEVIATION</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Configures pilot tone frequency deviation level. Unit is
+in Hz. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_FREQUENCY</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Configures pilot tone frequency value. Unit is
+in Hz. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TUNE_PREEMPHASIS</constant>&nbsp;</entry>
+ <entry>enum v4l2_preemphasis</entry>
+ </row>
+ <row id="v4l2-preemphasis"><entry spanname="descr">Configures the pre-emphasis value for broadcasting.
+A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
+Depending on the region, a time constant of either 50 or 75 useconds is used. The enum&nbsp;v4l2_preemphasis
+defines possible values for pre-emphasis. Here they are:</entry>
+ </row><row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_PREEMPHASIS_DISABLED</constant>&nbsp;</entry>
+ <entry>No pre-emphasis is applied.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_PREEMPHASIS_50_uS</constant>&nbsp;</entry>
+ <entry>A pre-emphasis of 50 uS is used.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_PREEMPHASIS_75_uS</constant>&nbsp;</entry>
+ <entry>A pre-emphasis of 75 uS is used.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TUNE_POWER_LEVEL</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the output power level for signal transmission.
+Unit is in dBuV. Range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TUNE_ANTENNA_CAPACITOR</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">This selects the value of antenna tuning capacitor
+manually or automatically if set to zero. Unit, range and step are driver-specific.</entry>
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+<para>For more details about RDS specification, refer to
+<xref linkend="iec62106" /> document, from CENELEC.</para>
+ </section>
+
+ <section id="flash-controls">
+ <title>Flash Control Reference</title>
+
+ <note>
+ <title>Experimental</title>
+
+ <para>This is an <link linkend="experimental">experimental</link>
+interface and may change in the future.</para>
+ </note>
+
+ <para>
+ The V4L2 flash controls are intended to provide generic access
+ to flash controller devices. Flash controller devices are
+ typically used in digital cameras.
+ </para>
+
+ <para>
+ The interface can support both LED and xenon flash devices. As
+ of writing this, there is no xenon flash driver using this
+ interface.
+ </para>
+
+ <section id="flash-controls-use-cases">
+ <title>Supported use cases</title>
+
+ <section>
+ <title>Unsynchronised LED flash (software strobe)</title>
+
+ <para>
+ Unsynchronised LED flash is controlled directly by the
+ host as the sensor. The flash must be enabled by the host
+ before the exposure of the image starts and disabled once
+ it ends. The host is fully responsible for the timing of
+ the flash.
+ </para>
+
+ <para>Example of such device: Nokia N900.</para>
+ </section>
+
+ <section>
+ <title>Synchronised LED flash (hardware strobe)</title>
+
+ <para>
+ The synchronised LED flash is pre-programmed by the host
+ (power and timeout) but controlled by the sensor through a
+ strobe signal from the sensor to the flash.
+ </para>
+
+ <para>
+ The sensor controls the flash duration and timing. This
+ information typically must be made available to the
+ sensor.
+ </para>
+
+ </section>
+
+ <section>
+ <title>LED flash as torch</title>
+
+ <para>
+ LED flash may be used as torch in conjunction with another
+ use case involving camera or individually.
+ </para>
+
+
+ <table pgwide="1" frame="none" id="flash-control-id">
+ <title>Flash Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_CLASS</constant></entry>
+ <entry>class</entry>
+ </row>
+ <row>
+ <entry spanname="descr">The FLASH class descriptor.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_LED_MODE</constant></entry>
+ <entry>menu</entry>
+ </row>
+ <row id="v4l2-flash-led-mode">
+ <entry spanname="descr">Defines the mode of the flash LED,
+ the high-power white LED attached to the flash controller.
+ Setting this control may not be possible in presence of
+ some faults. See V4L2_CID_FLASH_FAULT.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_FLASH_LED_MODE_NONE</constant></entry>
+ <entry>Off.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_LED_MODE_FLASH</constant></entry>
+ <entry>Flash mode.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_LED_MODE_TORCH</constant></entry>
+ <entry>Torch mode. See V4L2_CID_FLASH_TORCH_INTENSITY.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_SOURCE</constant></entry>
+ <entry>menu</entry>
+ </row>
+ <row id="v4l2-flash-strobe-source"><entry
+ spanname="descr">Defines the source of the flash LED
+ strobe.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_FLASH_STROBE_SOURCE_SOFTWARE</constant></entry>
+ <entry>The flash strobe is triggered by using
+ the V4L2_CID_FLASH_STROBE control.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_STROBE_SOURCE_EXTERNAL</constant></entry>
+ <entry>The flash strobe is triggered by an
+ external source. Typically this is a sensor,
+ which makes it possible to synchronises the
+ flash strobe start to exposure start.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE</constant></entry>
+ <entry>button</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Strobe flash. Valid when
+ V4L2_CID_FLASH_LED_MODE is set to
+ V4L2_FLASH_LED_MODE_FLASH and V4L2_CID_FLASH_STROBE_SOURCE
+ is set to V4L2_FLASH_STROBE_SOURCE_SOFTWARE. Setting this
+ control may not be possible in presence of some faults.
+ See V4L2_CID_FLASH_FAULT.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STOP</constant></entry>
+ <entry>button</entry>
+ </row>
+ <row><entry spanname="descr">Stop flash strobe immediately.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STATUS</constant></entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Strobe status: whether the flash
+ is strobing at the moment or not. This is a read-only
+ control.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_TIMEOUT</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Hardware timeout for flash. The
+ flash strobe is stopped after this period of time has
+ passed from the start of the strobe.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_INTENSITY</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Intensity of the flash strobe when
+ the flash LED is in flash mode
+ (V4L2_FLASH_LED_MODE_FLASH). The unit should be milliamps
+ (mA) if possible.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_TORCH_INTENSITY</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Intensity of the flash LED in
+ torch mode (V4L2_FLASH_LED_MODE_TORCH). The unit should be
+ milliamps (mA) if possible. Setting this control may not
+ be possible in presence of some faults. See
+ V4L2_CID_FLASH_FAULT.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_INDICATOR_INTENSITY</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Intensity of the indicator LED.
+ The indicator LED may be fully independent of the flash
+ LED. The unit should be microamps (uA) if possible.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_FAULT</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Faults related to the flash. The
+ faults tell about specific problems in the flash chip
+ itself or the LEDs attached to it. Faults may prevent
+ further use of some of the flash controls. In particular,
+ V4L2_CID_FLASH_LED_MODE is set to V4L2_FLASH_LED_MODE_NONE
+ if the fault affects the flash LED. Exactly which faults
+ have such an effect is chip dependent. Reading the faults
+ resets the control and returns the chip to a usable state
+ if possible.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_OVER_VOLTAGE</constant></entry>
+ <entry>Flash controller voltage to the flash LED
+ has exceeded the limit specific to the flash
+ controller.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_TIMEOUT</constant></entry>
+ <entry>The flash strobe was still on when
+ the timeout set by the user ---
+ V4L2_CID_FLASH_TIMEOUT control --- has expired.
+ Not all flash controllers may set this in all
+ such conditions.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_OVER_TEMPERATURE</constant></entry>
+ <entry>The flash controller has overheated.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_SHORT_CIRCUIT</constant></entry>
+ <entry>The short circuit protection of the flash
+ controller has been triggered.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_OVER_CURRENT</constant></entry>
+ <entry>Current in the LED power supply has exceeded the limit
+ specific to the flash controller.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_INDICATOR</constant></entry>
+ <entry>The flash controller has detected a short or open
+ circuit condition on the indicator LED.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_UNDER_VOLTAGE</constant></entry>
+ <entry>Flash controller voltage to the flash LED
+ has been below the minimum limit specific to the flash
+ controller.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_INPUT_VOLTAGE</constant></entry>
+ <entry>The input voltage of the flash controller is below
+ the limit under which strobing the flash at full current
+ will not be possible.The condition persists until this flag
+ is no longer set.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE</constant></entry>
+ <entry>The temperature of the LED has exceeded its
+ allowed upper limit.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_CHARGE</constant></entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">Enable or disable charging of the xenon
+ flash capacitor.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FLASH_READY</constant></entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Is the flash ready to strobe?
+ Xenon flashes require their capacitors charged before
+ strobing. LED flashes often require a cooldown period
+ after strobe during which another strobe will not be
+ possible. This is a read-only control.</entry>
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+ </section>
+ </section>
+
+ <section id="jpeg-controls">
+ <title>JPEG Control Reference</title>
+ <para>The JPEG class includes controls for common features of JPEG
+ encoders and decoders. Currently it includes features for codecs
+ implementing progressive baseline DCT compression process with
+ Huffman entrophy coding.</para>
+ <table pgwide="1" frame="none" id="jpeg-control-id">
+ <title>JPEG Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_JPEG_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The JPEG class descriptor. Calling
+ &VIDIOC-QUERYCTRL; for this control will return a description of this
+ control class.
+
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant></entry>
+ <entry>menu</entry>
+ </row>
+ <row id="v4l2-jpeg-chroma-subsampling">
+ <entry spanname="descr">The chroma subsampling factors describe how
+ each component of an input image is sampled, in respect to maximum
+ sample rate in each spatial dimension. See <xref linkend="itu-t81"/>,
+ clause A.1.1. for more details. The <constant>
+ V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant> control determines how
+ Cb and Cr components are downsampled after coverting an input image
+ from RGB to Y'CbCr color space.
+ </entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_444</constant>
+ </entry><entry>No chroma subsampling, each pixel has
+ Y, Cr and Cb values.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_422</constant>
+ </entry><entry>Horizontally subsample Cr, Cb components
+ by a factor of 2.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_420</constant>
+ </entry><entry>Subsample Cr, Cb components horizontally
+ and vertically by 2.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_411</constant>
+ </entry><entry>Horizontally subsample Cr, Cb components
+ by a factor of 4.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_410</constant>
+ </entry><entry>Subsample Cr, Cb components horizontally
+ by 4 and vertically by 2.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY</constant>
+ </entry><entry>Use only luminance component.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_JPEG_RESTART_INTERVAL</constant>
+ </entry><entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">
+ The restart interval determines an interval of inserting RSTm
+ markers (m = 0..7). The purpose of these markers is to additionally
+ reinitialize the encoder process, in order to process blocks of
+ an image independently.
+ For the lossy compression processes the restart interval unit is
+ MCU (Minimum Coded Unit) and its value is contained in DRI
+ (Define Restart Interval) marker. If <constant>
+ V4L2_CID_JPEG_RESTART_INTERVAL</constant> control is set to 0,
+ DRI and RSTm markers will not be inserted.
+ </entry>
+ </row>
+ <row id="jpeg-quality-control">
+ <entry spanname="id"><constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">
+ <constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control
+ determines trade-off between image quality and size.
+ It provides simpler method for applications to control image quality,
+ without a need for direct reconfiguration of luminance and chrominance
+ quantization tables.
+
+ In cases where a driver uses quantization tables configured directly
+ by an application, using interfaces defined elsewhere, <constant>
+ V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control should be set
+ by driver to 0.
+
+ <para>The value range of this control is driver-specific. Only
+ positive, non-zero values are meaningful. The recommended range
+ is 1 - 100, where larger values correspond to better image quality.
+ </para>
+ </entry>
+ </row>
+ <row id="jpeg-active-marker-control">
+ <entry spanname="id"><constant>V4L2_CID_JPEG_ACTIVE_MARKER</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Specify which JPEG markers are included
+ in compressed stream. This control is valid only for encoders.
+ </entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP0</constant></entry>
+ <entry>Application data segment APP<subscript>0</subscript>.</entry>
+ </row><row>
+ <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP1</constant></entry>
+ <entry>Application data segment APP<subscript>1</subscript>.</entry>
+ </row><row>
+ <entry><constant>V4L2_JPEG_ACTIVE_MARKER_COM</constant></entry>
+ <entry>Comment segment.</entry>
+ </row><row>
+ <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DQT</constant></entry>
+ <entry>Quantization tables segment.</entry>
+ </row><row>
+ <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DHT</constant></entry>
+ <entry>Huffman tables segment.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+ <para>For more details about JPEG specification, refer
+ to <xref linkend="itu-t81"/>, <xref linkend="jfif"/>,
+ <xref linkend="w3c-jpeg-jfif"/>.</para>
+ </section>
+
+ <section id="image-source-controls">
+ <title>Image Source Control Reference</title>
+
+ <note>
+ <title>Experimental</title>
+
+ <para>This is an <link
+ linkend="experimental">experimental</link> interface and may
+ change in the future.</para>
+ </note>
+
+ <para>
+ The Image Source control class is intended for low-level
+ control of image source devices such as image sensors. The
+ devices feature an analogue to digital converter and a bus
+ transmitter to transmit the image data out of the device.
+ </para>
+
+ <table pgwide="1" frame="none" id="image-source-control-id">
+ <title>Image Source Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant></entry>
+ <entry>class</entry>
+ </row>
+ <row>
+ <entry spanname="descr">The IMAGE_SOURCE class descriptor.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_VBLANK</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Vertical blanking. The idle period
+ after every frame during which no image data is produced.
+ The unit of vertical blanking is a line. Every line has
+ length of the image width plus horizontal blanking at the
+ pixel rate defined by
+ <constant>V4L2_CID_PIXEL_RATE</constant> control in the
+ same sub-device.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_HBLANK</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Horizontal blanking. The idle
+ period after every line of image data during which no
+ image data is produced. The unit of horizontal blanking is
+ pixels.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_ANALOGUE_GAIN</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Analogue gain is gain affecting
+ all colour components in the pixel matrix. The gain
+ operation is performed in the analogue domain before A/D
+ conversion.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_RED</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Test pattern red colour component.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_GREENR</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Test pattern green (next to red)
+ colour component.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_BLUE</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Test pattern blue colour component.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN_GREENB</constant></entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Test pattern green (next to blue)
+ colour component.
+ </entry>
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
+
+ <section id="image-process-controls">
+ <title>Image Process Control Reference</title>
+
+ <note>
+ <title>Experimental</title>
+
+ <para>This is an <link
+ linkend="experimental">experimental</link> interface and may
+ change in the future.</para>
+ </note>
+
+ <para>
+ The Image Source control class is intended for low-level control of
+ image processing functions. Unlike
+ <constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant>, the controls in
+ this class affect processing the image, and do not control capturing
+ of it.
+ </para>
+
+ <table pgwide="1" frame="none" id="image-process-control-id">
+ <title>Image Source Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_IMAGE_PROC_CLASS</constant></entry>
+ <entry>class</entry>
+ </row>
+ <row>
+ <entry spanname="descr">The IMAGE_PROC class descriptor.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_LINK_FREQ</constant></entry>
+ <entry>integer menu</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Data bus frequency. Together with the
+ media bus pixel code, bus type (clock cycles per sample), the
+ data bus frequency defines the pixel rate
+ (<constant>V4L2_CID_PIXEL_RATE</constant>) in the
+ pixel array (or possibly elsewhere, if the device is not an
+ image sensor). The frame rate can be calculated from the pixel
+ clock, image width and height and horizontal and vertical
+ blanking. While the pixel rate control may be defined elsewhere
+ than in the subdev containing the pixel array, the frame rate
+ cannot be obtained from that information. This is because only
+ on the pixel array it can be assumed that the vertical and
+ horizontal blanking information is exact: no other blanking is
+ allowed in the pixel array. The selection of frame rate is
+ performed by selecting the desired horizontal and vertical
+ blanking. The unit of this control is Hz. </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_PIXEL_RATE</constant></entry>
+ <entry>64-bit integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Pixel rate in the source pads of
+ the subdev. This control is read-only and its unit is
+ pixels / second.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN</constant></entry>
+ <entry>menu</entry>
+ </row>
+ <row id="v4l2-test-pattern">
+ <entry spanname="descr"> Some capture/display/sensor devices have
+ the capability to generate test pattern images. These hardware
+ specific test patterns can be used to test if a device is working
+ properly.</entry>
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
+
+ <section id="dv-controls">
+ <title>Digital Video Control Reference</title>
+
+ <note>
+ <title>Experimental</title>
+
+ <para>This is an <link
+ linkend="experimental">experimental</link> interface and may
+ change in the future.</para>
+ </note>
+
+ <para>
+ The Digital Video control class is intended to control receivers
+ and transmitters for <ulink url="http://en.wikipedia.org/wiki/Vga">VGA</ulink>,
+ <ulink url="http://en.wikipedia.org/wiki/Digital_Visual_Interface">DVI</ulink>
+ (Digital Visual Interface), HDMI (<xref linkend="hdmi" />) and DisplayPort (<xref linkend="dp" />).
+ These controls are generally expected to be private to the receiver or transmitter
+ subdevice that implements them, so they are only exposed on the
+ <filename>/dev/v4l-subdev*</filename> device node.
+ </para>
+
+ <para>Note that these devices can have multiple input or output pads which are
+ hooked up to e.g. HDMI connectors. Even though the subdevice will receive or
+ transmit video from/to only one of those pads, the other pads can still be
+ active when it comes to EDID (Extended Display Identification Data,
+ <xref linkend="vesaedid" />) and HDCP (High-bandwidth Digital Content
+ Protection System, <xref linkend="hdcp" />) processing, allowing the device
+ to do the fairly slow EDID/HDCP handling in advance. This allows for quick
+ switching between connectors.</para>
+
+ <para>These pads appear in several of the controls in this section as
+ bitmasks, one bit for each pad. Bit 0 corresponds to pad 0, bit 1 to pad 1,
+ etc. The maximum value of the control is the set of valid pads.</para>
+
+ <table pgwide="1" frame="none" id="dv-control-id">
+ <title>Digital Video Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_CLASS</constant></entry>
+ <entry>class</entry>
+ </row>
+ <row>
+ <entry spanname="descr">The Digital Video class descriptor.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_TX_HOTPLUG</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Many connectors have a hotplug pin which is high
+ if EDID information is available from the source. This control shows the
+ state of the hotplug pin as seen by the transmitter.
+ Each bit corresponds to an output pad on the transmitter. If an output pad
+ does not have an associated hotplug pin, then the bit for that pad will be 0.
+ This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_TX_RXSENSE</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Rx Sense is the detection of pull-ups on the TMDS
+ clock lines. This normally means that the sink has left/entered standby (i.e.
+ the transmitter can sense that the receiver is ready to receive video).
+ Each bit corresponds to an output pad on the transmitter. If an output pad
+ does not have an associated Rx Sense, then the bit for that pad will be 0.
+ This read-only control is applicable to DVI-D and HDMI devices.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_TX_EDID_PRESENT</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">When the transmitter sees the hotplug signal from the
+ receiver it will attempt to read the EDID. If set, then the transmitter has read
+ at least the first block (= 128 bytes).
+ Each bit corresponds to an output pad on the transmitter. If an output pad
+ does not support EDIDs, then the bit for that pad will be 0.
+ This read-only control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_TX_MODE</constant></entry>
+ <entry id="v4l2-dv-tx-mode">enum v4l2_dv_tx_mode</entry>
+ </row>
+ <row>
+ <entry spanname="descr">HDMI transmitters can transmit in DVI-D mode (just video)
+ or in HDMI mode (video + audio + auxiliary data). This control selects which mode
+ to use: V4L2_DV_TX_MODE_DVI_D or V4L2_DV_TX_MODE_HDMI.
+ This control is applicable to HDMI connectors.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_TX_RGB_RANGE</constant></entry>
+ <entry id="v4l2-dv-rgb-range">enum v4l2_dv_rgb_range</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Select the quantization range for RGB output. V4L2_DV_RANGE_AUTO
+ follows the RGB quantization range specified in the standard for the video interface
+ (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard
+ to be compatible with sinks that have not implemented the standard correctly
+ (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be
+ used whereas limited range sets the range to (16 &lt;&lt; (N-8)) - (235 &lt;&lt; (N-8))
+ where N is the number of bits per component.
+ This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_RX_POWER_PRESENT</constant></entry>
+ <entry>bitmask</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Detects whether the receiver receives power from the source
+ (e.g. HDMI carries 5V on one of the pins). This is often used to power an eeprom
+ which contains EDID information, such that the source can read the EDID even if
+ the sink is in standby/power off.
+ Each bit corresponds to an input pad on the transmitter. If an input pad
+ cannot detect whether power is present, then the bit for that pad will be 0.
+ This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors.
+ </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DV_RX_RGB_RANGE</constant></entry>
+ <entry>enum v4l2_dv_rgb_range</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Select the quantization range for RGB input. V4L2_DV_RANGE_AUTO
+ follows the RGB quantization range specified in the standard for the video interface
+ (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard
+ to be compatible with sources that have not implemented the standard correctly
+ (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be
+ used whereas limited range sets the range to (16 &lt;&lt; (N-8)) - (235 &lt;&lt; (N-8))
+ where N is the number of bits per component.
+ This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors.
+ </entry>
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
+
+ <section id="fm-rx-controls">
+ <title>FM Receiver Control Reference</title>
+
+ <para>The FM Receiver (FM_RX) class includes controls for common features of
+ FM Reception capable devices.</para>
+
+ <table pgwide="1" frame="none" id="fm-rx-control-id">
+ <title>FM_RX Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_FM_RX_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The FM_RX class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RECEPTION</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row><row><entry spanname="descr">Enables/disables RDS
+ reception by the radio tuner</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RX_PTY</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Gets RDS Programme Type field.
+This encodes up to 31 pre-defined programme types.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RX_PS_NAME</constant>&nbsp;</entry>
+ <entry>string</entry>
+ </row>
+ <row><entry spanname="descr">Gets the Programme Service name (PS_NAME).
+It is intended for static display on a receiver. It is the primary aid to listeners in programme service
+identification and selection. In Annex E of <xref linkend="iec62106" />, the RDS specification,
+there is a full description of the correct character encoding for Programme Service name strings.
+Also from RDS specification, PS is usually a single eight character text. However, it is also possible
+to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured
+with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RX_RADIO_TEXT</constant>&nbsp;</entry>
+ <entry>string</entry>
+ </row>
+ <row><entry spanname="descr">Gets the Radio Text info. It is a textual description of
+what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names,
+programme-related information or any other text. In these cases, RadioText can be used in addition to
+<constant>V4L2_CID_RDS_RX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described
+in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being
+used to transmit it, either 32 (2A block) or 64 (2B block). However, it is also possible
+to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured
+with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then a traffic announcement is in progress.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RX_TRAFFIC_PROGRAM</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then the tuned programme carries traffic announcements.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RDS_RX_MUSIC_SPEECH</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row><entry spanname="descr">If set, then this channel broadcasts music. If cleared, then it
+broadcasts speech. If the transmitter doesn't make this distinction, then it will be set.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_TUNE_DEEMPHASIS</constant>&nbsp;</entry>
+ <entry>enum v4l2_deemphasis</entry>
+ </row>
+ <row id="v4l2-deemphasis"><entry spanname="descr">Configures the de-emphasis value for reception.
+A de-emphasis filter is applied to the broadcast to accentuate the high audio frequencies.
+Depending on the region, a time constant of either 50 or 75 useconds is used. The enum&nbsp;v4l2_deemphasis
+defines possible values for de-emphasis. Here they are:</entry>
+ </row><row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_DISABLED</constant>&nbsp;</entry>
+ <entry>No de-emphasis is applied.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_50_uS</constant>&nbsp;</entry>
+ <entry>A de-emphasis of 50 uS is used.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DEEMPHASIS_75_uS</constant>&nbsp;</entry>
+ <entry>A de-emphasis of 75 uS is used.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+
+ </row>
+ <row><entry></entry></row>
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+
+ <section id="detect-controls">
+ <title>Detect Control Reference</title>
+
+ <para>The Detect class includes controls for common features of
+ various motion or object detection capable devices.</para>
+
+ <table pgwide="1" frame="none" id="detect-control-id">
+ <title>Detect Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DETECT_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The Detect class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DETECT_MD_MODE</constant>&nbsp;</entry>
+ <entry>menu</entry>
+ </row><row><entry spanname="descr">Sets the motion detection mode.</entry>
+ </row>
+ <row>
+ <entrytbl spanname="descr" cols="2">
+ <tbody valign="top">
+ <row>
+ <entry><constant>V4L2_DETECT_MD_MODE_DISABLED</constant>
+ </entry><entry>Disable motion detection.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DETECT_MD_MODE_GLOBAL</constant>
+ </entry><entry>Use a single motion detection threshold.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DETECT_MD_MODE_THRESHOLD_GRID</constant>
+ </entry><entry>The image is divided into a grid, each cell with its own
+ motion detection threshold. These thresholds are set through the
+ <constant>V4L2_CID_DETECT_MD_THRESHOLD_GRID</constant> matrix control.</entry>
+ </row>
+ <row>
+ <entry><constant>V4L2_DETECT_MD_MODE_REGION_GRID</constant>
+ </entry><entry>The image is divided into a grid, each cell with its own
+ region value that specifies which per-region motion detection thresholds
+ should be used. Each region has its own thresholds. How these per-region
+ thresholds are set up is driver-specific. The region values for the grid are set
+ through the <constant>V4L2_CID_DETECT_MD_REGION_GRID</constant> matrix
+ control.</entry>
+ </row>
+ </tbody>
+ </entrytbl>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row><entry spanname="descr">Sets the global motion detection threshold to be
+ used with the <constant>V4L2_DETECT_MD_MODE_GLOBAL</constant> motion detection mode.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DETECT_MD_THRESHOLD_GRID</constant>&nbsp;</entry>
+ <entry>__u16 matrix</entry>
+ </row>
+ <row><entry spanname="descr">Sets the motion detection thresholds for each cell in the grid.
+ To be used with the <constant>V4L2_DETECT_MD_MODE_THRESHOLD_GRID</constant>
+ motion detection mode. Matrix element (0, 0) represents the cell at the top-left of the
+ grid.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_DETECT_MD_REGION_GRID</constant>&nbsp;</entry>
+ <entry>__u8 matrix</entry>
+ </row>
+ <row><entry spanname="descr">Sets the motion detection region value for each cell in the grid.
+ To be used with the <constant>V4L2_DETECT_MD_MODE_REGION_GRID</constant>
+ motion detection mode. Matrix element (0, 0) represents the cell at the top-left of the
+ grid.</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+
+ </section>
+
+ <section id="rf-tuner-controls">
+ <title>RF Tuner Control Reference</title>
+
+ <para>
+The RF Tuner (RF_TUNER) class includes controls for common features of devices
+having RF tuner.
+ </para>
+ <para>
+In this context, RF tuner is radio receiver circuit between antenna and
+demodulator. It receives radio frequency (RF) from the antenna and converts that
+received signal to lower intermediate frequency (IF) or baseband frequency (BB).
+Tuners that could do baseband output are often called Zero-IF tuners. Older
+tuners were typically simple PLL tuners inside a metal box, whilst newer ones
+are highly integrated chips without a metal box "silicon tuners". These controls
+are mostly applicable for new feature rich silicon tuners, just because older
+tuners does not have much adjustable features.
+ </para>
+ <para>
+For more information about RF tuners see
+<ulink url="http://en.wikipedia.org/wiki/Tuner_%28radio%29">Tuner (radio)</ulink>
+and
+<ulink url="http://en.wikipedia.org/wiki/RF_front_end">RF front end</ulink>
+from Wikipedia.
+ </para>
+
+ <table pgwide="1" frame="none" id="rf-tuner-control-id">
+ <title>RF_TUNER Control IDs</title>
+
+ <tgroup cols="4">
+ <colspec colname="c1" colwidth="1*" />
+ <colspec colname="c2" colwidth="6*" />
+ <colspec colname="c3" colwidth="2*" />
+ <colspec colname="c4" colwidth="6*" />
+ <spanspec namest="c1" nameend="c2" spanname="id" />
+ <spanspec namest="c2" nameend="c4" spanname="descr" />
+ <thead>
+ <row>
+ <entry spanname="id" align="left">ID</entry>
+ <entry align="left">Type</entry>
+ </row>
+ <row rowsep="1">
+ <entry spanname="descr" align="left">Description</entry>
+ </row>
+ </thead>
+ <tbody valign="top">
+ <row><entry></entry></row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_CLASS</constant>&nbsp;</entry>
+ <entry>class</entry>
+ </row><row><entry spanname="descr">The RF_TUNER class
+descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a
+description of this control class.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_BANDWIDTH_AUTO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Enables/disables tuner radio channel
+bandwidth configuration. In automatic mode bandwidth configuration is performed
+by the driver.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_BANDWIDTH</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Filter(s) on tuner signal path are used to
+filter signal according to receiving party needs. Driver configures filters to
+fulfill desired bandwidth requirement. Used when V4L2_CID_RF_TUNER_BANDWIDTH_AUTO is not
+set. Unit is in Hz. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Enables/disables LNA automatic gain control (AGC)</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Enables/disables mixer automatic gain control (AGC)</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_IF_GAIN_AUTO</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Enables/disables IF automatic gain control (AGC)</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">LNA (low noise amplifier) gain is first
+gain stage on the RF tuner signal path. It is located very close to tuner
+antenna input. Used when <constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant> is not set.
+The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_MIXER_GAIN</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Mixer gain is second gain stage on the RF
+tuner signal path. It is located inside mixer block, where RF signal is
+down-converted by the mixer. Used when <constant>V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO</constant>
+is not set. The range and step are driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_IF_GAIN</constant>&nbsp;</entry>
+ <entry>integer</entry>
+ </row>
+ <row>
+ <entry spanname="descr">IF gain is last gain stage on the RF tuner
+signal path. It is located on output of RF tuner. It controls signal level of
+intermediate frequency output or baseband output. Used when
+<constant>V4L2_CID_RF_TUNER_IF_GAIN_AUTO</constant> is not set. The range and step are
+driver-specific.</entry>
+ </row>
+ <row>
+ <entry spanname="id"><constant>V4L2_CID_RF_TUNER_PLL_LOCK</constant>&nbsp;</entry>
+ <entry>boolean</entry>
+ </row>
+ <row>
+ <entry spanname="descr">Is synthesizer PLL locked? RF tuner is
+receiving given frequency when that control is set. This is a read-only control.
+</entry>
+ </row>
+ </tbody>
+ </tgroup>
+ </table>
+ </section>
+</section>