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Diffstat (limited to 'kernel/Documentation/DocBook/media/v4l/controls.xml')
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diff --git a/kernel/Documentation/DocBook/media/v4l/controls.xml b/kernel/Documentation/DocBook/media/v4l/controls.xml new file mode 100644 index 000000000..4e9462f1a --- /dev/null +++ b/kernel/Documentation/DocBook/media/v4l/controls.xml @@ -0,0 +1,5464 @@ + <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 ⪚ 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 & 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> </entry> + <entry>Color effect is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_ANTIQUE</constant> </entry> + <entry>An aging (old photo) effect.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_ART_FREEZE</constant> </entry> + <entry>Frost color effect.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_AQUA</constant> </entry> + <entry>Water color, cool tone.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_BW</constant> </entry> + <entry>Black and white.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_EMBOSS</constant> </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> </entry> + <entry>Grass green.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_NEGATIVE</constant> </entry> + <entry>Negative.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SEPIA</constant> </entry> + <entry>Sepia tone.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SKETCH</constant> </entry> + <entry>Sketch.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SKIN_WHITEN</constant> </entry> + <entry>Skin whiten.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SKY_BLUE</constant> </entry> + <entry>Sky blue.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SOLARIZATION</constant> </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> </entry> + <entry>Silhouette (outline).</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_VIVID</constant> </entry> + <entry>Vivid colors.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SET_CBCR</constant> </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(&querymenu, 0, sizeof(querymenu)); + querymenu.id = queryctrl.id; + + for (querymenu.index = queryctrl.minimum; + querymenu.index <= queryctrl.maximum; + querymenu.index++) { + if (0 == ioctl(fd, &VIDIOC-QUERYMENU;, &querymenu)) { + printf(" %s\n", querymenu.name); + } + } +} + +memset(&queryctrl, 0, sizeof(queryctrl)); + +for (queryctrl.id = V4L2_CID_BASE; + queryctrl.id < V4L2_CID_LASTP1; + queryctrl.id++) { + if (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { + if (queryctrl.flags & 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;, &queryctrl)) { + if (queryctrl.flags & 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(&queryctrl, 0, sizeof(queryctrl)); + +queryctrl.id = V4L2_CTRL_CLASS_USER | V4L2_CTRL_FLAG_NEXT_CTRL; +while (0 == ioctl(fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { + if (V4L2_CTRL_ID2CLASS(queryctrl.id) != V4L2_CTRL_CLASS_USER) + break; + if (queryctrl.flags & 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(&queryctrl, 0, sizeof(queryctrl)); +queryctrl.id = V4L2_CID_BRIGHTNESS; + +if (-1 == ioctl(fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { + if (errno != EINVAL) { + perror("VIDIOC_QUERYCTRL"); + exit(EXIT_FAILURE); + } else { + printf("V4L2_CID_BRIGHTNESS is not supported\n"); + } +} else if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) { + printf("V4L2_CID_BRIGHTNESS is not supported\n"); +} else { + memset(&control, 0, sizeof (control)); + control.id = V4L2_CID_BRIGHTNESS; + control.value = queryctrl.default_value; + + if (-1 == ioctl(fd, &VIDIOC-S-CTRL;, &control)) { + perror("VIDIOC_S_CTRL"); + exit(EXIT_FAILURE); + } +} + +memset(&control, 0, sizeof(control)); +control.id = V4L2_CID_CONTRAST; + +if (0 == ioctl(fd, &VIDIOC-G-CTRL;, &control)) { + control.value += 1; + + /* The driver may clamp the value or return ERANGE, ignored here */ + + if (-1 == ioctl(fd, &VIDIOC-S-CTRL;, &control) + && 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, &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;, &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;, &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 (⪚ <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> </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> </entry> + <entry>enum 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> </entry> + <entry>MPEG-2 program stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_TS</constant> </entry> + <entry>MPEG-2 transport stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_SS</constant> </entry> + <entry>MPEG-1 system stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_DVD</constant> </entry> + <entry>MPEG-2 DVD-compatible stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_VCD</constant> </entry> + <entry>MPEG-1 VCD-compatible stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD</constant> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum v4l2_mpeg_stream_vbi_fmt</entry> + </row><row><entry spanname="descr">Some cards can embed +VBI data (⪚ 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> </entry> + <entry>No VBI in the MPEG stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>44.1 kHz</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000</constant> </entry> + <entry>48 kHz</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>MPEG-1/2 Layer I encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_2</constant> </entry> + <entry>MPEG-1/2 Layer II encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_3</constant> </entry> + <entry>MPEG-1/2 Layer III encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant> </entry> + <entry>MPEG-2/4 AAC (Advanced Audio Coding)</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>32 kbit/s</entry></row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_288K</constant> </entry> + <entry>288 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_352K</constant> </entry> + <entry>352 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_384K</constant> </entry> + <entry>384 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_416K</constant> </entry> + <entry>416 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_448K</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>32 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_48K</constant> </entry> + <entry>48 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_56K</constant> </entry> + <entry>56 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_80K</constant> </entry> + <entry>80 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_112K</constant> </entry> + <entry>112 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_384K</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>32 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_40K</constant> </entry> + <entry>40 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_48K</constant> </entry> + <entry>48 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_56K</constant> </entry> + <entry>56 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_80K</constant> </entry> + <entry>80 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_112K</constant> </entry> + <entry>112 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_320K</constant> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>32 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_40K</constant> </entry> + <entry>40 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_48K</constant> </entry> + <entry>48 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_56K</constant> </entry> + <entry>56 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_80K</constant> </entry> + <entry>80 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_112K</constant> </entry> + <entry>112 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_384K</constant> </entry> + <entry>384 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_448K</constant> </entry> + <entry>448 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_512K</constant> </entry> + <entry>512 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_576K</constant> </entry> + <entry>576 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_640K</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_JOINT_STEREO</constant> </entry> + <entry>Joint Stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_DUAL</constant> </entry> + <entry>Bilingual</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_MONO</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Subbands 4-31 in intensity stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8</constant> </entry> + <entry>Subbands 8-31 in intensity stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12</constant> </entry> + <entry>Subbands 12-31 in intensity stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>None</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS</constant> </entry> + <entry>50/15 microsecond emphasis</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>None</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_CRC_CRC16</constant> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Automatically determines the best playback mode.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant> </entry> + <entry>Stereo playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant> </entry> + <entry>Left channel playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant> </entry> + <entry>Right channel playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant> </entry> + <entry>Mono playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>enum 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> </entry> + <entry>MPEG-1 Video encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_2</constant> </entry> + <entry>MPEG-2 Video encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant> </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> </entry> + <entry>enum 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> </entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_4x3</constant> </entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_16x9</constant> </entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_221x100</constant> </entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_B_FRAMES</constant> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Variable bitrate</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_CBR</constant> </entry> + <entry>Constant bitrate</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Unspecified</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1</constant> </entry> + <entry>1x1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11</constant> </entry> + <entry>12x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11</constant> </entry> + <entry>10x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11</constant> </entry> + <entry>16x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33</constant> </entry> + <entry>40x33</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11</constant> </entry> + <entry>24x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11</constant> </entry> + <entry>20x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11</constant> </entry> + <entry>32x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33</constant> </entry> + <entry>80x33</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11</constant> </entry> + <entry>18x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11</constant> </entry> + <entry>15x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33</constant> </entry> + <entry>64x33</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99</constant> </entry> + <entry>160x99</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3</constant> </entry> + <entry>4x3</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2</constant> </entry> + <entry>3x2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1</constant> </entry> + <entry>2x1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED</constant> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Level 1.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1B</constant> </entry> + <entry>Level 1B</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_1</constant> </entry> + <entry>Level 1.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_2</constant> </entry> + <entry>Level 1.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_3</constant> </entry> + <entry>Level 1.3</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_0</constant> </entry> + <entry>Level 2.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_1</constant> </entry> + <entry>Level 2.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_2</constant> </entry> + <entry>Level 2.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_0</constant> </entry> + <entry>Level 3.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_1</constant> </entry> + <entry>Level 3.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_2</constant> </entry> + <entry>Level 3.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_0</constant> </entry> + <entry>Level 4.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_1</constant> </entry> + <entry>Level 4.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_2</constant> </entry> + <entry>Level 4.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_0</constant> </entry> + <entry>Level 5.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_1</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Level 0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0B</constant> </entry> + <entry>Level 0b</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_1</constant> </entry> + <entry>Level 1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_2</constant> </entry> + <entry>Level 2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3</constant> </entry> + <entry>Level 3</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3B</constant> </entry> + <entry>Level 3b</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_4</constant> </entry> + <entry>Level 4</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_5</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Baseline profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE</constant> </entry> + <entry>Constrained Baseline profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MAIN</constant> </entry> + <entry>Main profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED</constant> </entry> + <entry>Extended profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH</constant> </entry> + <entry>High profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10</constant> </entry> + <entry>High 10 profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422</constant> </entry> + <entry>High 422 profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE</constant> </entry> + <entry>High 444 Predictive profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA</constant> </entry> + <entry>High 10 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA</constant> </entry> + <entry>High 422 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA</constant> </entry> + <entry>High 444 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA</constant> </entry> + <entry>CAVLC 444 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE</constant> </entry> + <entry>Scalable Baseline profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH</constant> </entry> + <entry>Scalable High profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA</constant> </entry> + <entry>Scalable High Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH</constant> </entry> + <entry>Stereo High profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Simple profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_SIMPLE</constant> </entry> + <entry>Advanced Simple profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_CORE</constant> </entry> + <entry>Core profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE_SCALABLE</constant> </entry> + <entry>Simple Scalable profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY</constant> </entry> + <entry></entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MAX_REF_PIC</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Single slice per frame.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Loop filter is enabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED</constant> </entry> + <entry>Loop filter is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY</constant> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Use CAVLC entropy coding.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Pixels are alternatively from L and R.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN</constant> </entry> + <entry>L and R are interlaced by column.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW</constant> </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> </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> </entry> + <entry>L is on top, R on bottom.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL</constant> </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> </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> </entry> + <entry>enum 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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Raster scan or wipe right.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT</constant> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Hierarchical B coding.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Frame skip mode is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT</constant> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Forcing a specific frame type disabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME</constant> </entry> + <entry>Force an I-frame.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Choose the filter manually</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO</constant> </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> </entry> + <entry>integer (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> </entry> + <entry>enum 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> </entry> + <entry>No filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR</constant> </entry> + <entry>One-dimensional horizontal</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT</constant> </entry> + <entry>One-dimensional vertical</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE</constant> </entry> + <entry>Two-dimensional separable</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>No filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>Choose the filter manually</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO</constant> </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> </entry> + <entry>integer (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> </entry> + <entry>enum 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> </entry> + <entry>No filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR</constant> </entry> + <entry>Horizontal filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT</constant> </entry> + <entry>Vertical filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT</constant> </entry> + <entry>Horizontal and vertical filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG</constant> </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> </entry> + <entry>integer (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> </entry> + <entry>integer (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> </entry> + <entry>integer (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> </entry> + <entry>integer (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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Automatic exposure time, automatic iris +aperture.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_MANUAL</constant> </entry> + <entry>Manual exposure time, manual iris.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_SHUTTER_PRIORITY</constant> </entry> + <entry>Manual exposure time, auto iris.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_APERTURE_PRIORITY</constant> </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> </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 µs 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> </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> </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> </entry> + <entry>enum 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> </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> </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> </entry> + <entry>Measure only very small area at the center of the frame.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_METERING_MATRIX</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>Automatic focus is not active.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_BUSY</constant> </entry> + <entry>Automatic focusing is in progress.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_REACHED</constant> </entry> + <entry>Focus has been reached.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_FAILED</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>The camera automatically selects the focus range.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_RANGE_NORMAL</constant> </entry> + <entry>Normal distance range, limited for best automatic focus +performance.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_RANGE_MACRO</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Manual white balance.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant> </entry> + <entry>Automatic white balance adjustments.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant> </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> </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> </entry> + <entry>With this setting the camera will compensate for +fluorescent H lighting.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant> </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> </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> </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> </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> </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> </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> </entry> + <entry>enum 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> </entry> + <entry>Manual ISO sensitivity.</entry> + </row> + <row> + <entry><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> </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> </entry> + <entry>enum 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> </entry> + <entry>The scene mode feature is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_BACKLIGHT</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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 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> </entry> + <entry>No pre-emphasis is applied.</entry> + </row> + <row> + <entry><constant>V4L2_PREEMPHASIS_50_uS</constant> </entry> + <entry>A pre-emphasis of 50 uS is used.</entry> + </row> + <row> + <entry><constant>V4L2_PREEMPHASIS_75_uS</constant> </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> </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> </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> </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 << (N-8)) - (235 << (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 << (N-8)) - (235 << (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> </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> </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> </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> </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> </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> </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> </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> </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> </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 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> </entry> + <entry>No de-emphasis is applied.</entry> + </row> + <row> + <entry><constant>V4L2_DEEMPHASIS_50_uS</constant> </entry> + <entry>A de-emphasis of 50 uS is used.</entry> + </row> + <row> + <entry><constant>V4L2_DEEMPHASIS_75_uS</constant> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> </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> |