diff options
Diffstat (limited to 'Documentation/DocBook')
15 files changed, 4203 insertions, 31 deletions
diff --git a/Documentation/DocBook/media/Makefile b/Documentation/DocBook/media/Makefile index 6628b4b9cac..362520992ce 100644 --- a/Documentation/DocBook/media/Makefile +++ b/Documentation/DocBook/media/Makefile @@ -70,6 +70,8 @@ IOCTLS = \ VIDIOC_SUBDEV_ENUM_MBUS_CODE \ VIDIOC_SUBDEV_ENUM_FRAME_SIZE \ VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL \ + VIDIOC_SUBDEV_G_SELECTION \ + VIDIOC_SUBDEV_S_SELECTION \ TYPES = \ $(shell perl -ne 'print "$$1 " if /^typedef\s+[^\s]+\s+([^\s]+)\;/' $(srctree)/include/linux/videodev2.h) \ @@ -193,7 +195,7 @@ DVB_DOCUMENTED = \ # install_media_images = \ - $(Q)cp $(OBJIMGFILES) $(MEDIA_OBJ_DIR)/media_api + $(Q)cp $(OBJIMGFILES) $(MEDIA_SRC_DIR)/v4l/*.svg $(MEDIA_OBJ_DIR)/media_api $(MEDIA_OBJ_DIR)/%: $(MEDIA_SRC_DIR)/%.b64 $(Q)base64 -d $< >$@ diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml index bce97c50391..87339b2aad7 100644 --- a/Documentation/DocBook/media/v4l/compat.xml +++ b/Documentation/DocBook/media/v4l/compat.xml @@ -2410,6 +2410,21 @@ details.</para> </orderedlist> </section> + <section> + <title>V4L2 in Linux 3.5</title> + <orderedlist> + <listitem> + <para>Added integer menus, the new type will be + V4L2_CTRL_TYPE_INTEGER_MENU.</para> + </listitem> + <listitem> + <para>Added selection API for V4L2 subdev interface: + &VIDIOC-SUBDEV-G-SELECTION; and + &VIDIOC-SUBDEV-S-SELECTION;.</para> + </listitem> + </orderedlist> + </section> + <section id="other"> <title>Relation of V4L2 to other Linux multimedia APIs</title> @@ -2523,6 +2538,10 @@ ioctls.</para> <listitem> <para>Selection API. <xref linkend="selection-api" /></para> </listitem> + <listitem> + <para>Sub-device selection API: &VIDIOC-SUBDEV-G-SELECTION; + and &VIDIOC-SUBDEV-S-SELECTION; ioctls.</para> + </listitem> </itemizedlist> </section> @@ -2538,6 +2557,13 @@ interfaces and should not be implemented in new drivers.</para> <constant>VIDIOC_S_MPEGCOMP</constant> ioctls. Use Extended Controls, <xref linkend="extended-controls" />.</para> </listitem> + <listitem> + <para><constant>VIDIOC_SUBDEV_G_CROP</constant> and + <constant>VIDIOC_SUBDEV_S_CROP</constant> ioctls. Use + <constant>VIDIOC_SUBDEV_G_SELECTION</constant> and + <constant>VIDIOC_SUBDEV_S_SELECTION</constant>, <xref + linkend="vidioc-subdev-g-selection" />.</para> + </listitem> </itemizedlist> </section> </section> diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index b84f25e9cc8..5038a3a9a24 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -3486,7 +3486,7 @@ interface and may change in the future.</para> from RGB to Y'CbCr color space. </entry> </row> - <row> + <row id = "v4l2-jpeg-chroma-subsampling"> <entrytbl spanname="descr" cols="2"> <tbody valign="top"> <row> diff --git a/Documentation/DocBook/media/v4l/dev-subdev.xml b/Documentation/DocBook/media/v4l/dev-subdev.xml index 0916a7343a1..4afcbbec5ed 100644 --- a/Documentation/DocBook/media/v4l/dev-subdev.xml +++ b/Documentation/DocBook/media/v4l/dev-subdev.xml @@ -76,11 +76,12 @@ <wordasword>format</wordasword> means the combination of media bus data format, frame width and frame height.</para></note> - <para>Image formats are typically negotiated on video capture and output - devices using the <link linkend="crop">cropping and scaling</link> ioctls. - The driver is responsible for configuring every block in the video pipeline - according to the requested format at the pipeline input and/or - output.</para> + <para>Image formats are typically negotiated on video capture and + output devices using the format and <link + linkend="vidioc-subdev-g-selection">selection</link> ioctls. The + driver is responsible for configuring every block in the video + pipeline according to the requested format at the pipeline input + and/or output.</para> <para>For complex devices, such as often found in embedded systems, identical image sizes at the output of a pipeline can be achieved using @@ -276,11 +277,11 @@ </section> <section> - <title>Cropping and scaling</title> + <title>Selections: cropping, scaling and composition</title> <para>Many sub-devices support cropping frames on their input or output pads (or possible even on both). Cropping is used to select the area of - interest in an image, typically on a video sensor or video decoder. It can + interest in an image, typically on an image sensor or a video decoder. It can also be used as part of digital zoom implementations to select the area of the image that will be scaled up.</para> @@ -288,26 +289,179 @@ &v4l2-rect; by the coordinates of the top left corner and the rectangle size. Both the coordinates and sizes are expressed in pixels.</para> - <para>The crop rectangle is retrieved and set using the - &VIDIOC-SUBDEV-G-CROP; and &VIDIOC-SUBDEV-S-CROP; ioctls. Like for pad - formats, drivers store try and active crop rectangles. The format - negotiation mechanism applies to crop settings as well.</para> - - <para>On input pads, cropping is applied relatively to the current pad - format. The pad format represents the image size as received by the - sub-device from the previous block in the pipeline, and the crop rectangle - represents the sub-image that will be transmitted further inside the - sub-device for processing. The crop rectangle be entirely containted - inside the input image size.</para> - - <para>Input crop rectangle are reset to their default value when the input - image format is modified. Drivers should use the input image size as the - crop rectangle default value, but hardware requirements may prevent this. - </para> + <para>As for pad formats, drivers store try and active + rectangles for the selection targets of ACTUAL type <xref + linkend="v4l2-subdev-selection-targets">.</xref></para> + + <para>On sink pads, cropping is applied relative to the + current pad format. The pad format represents the image size as + received by the sub-device from the previous block in the + pipeline, and the crop rectangle represents the sub-image that + will be transmitted further inside the sub-device for + processing.</para> + + <para>The scaling operation changes the size of the image by + scaling it to new dimensions. The scaling ratio isn't specified + explicitly, but is implied from the original and scaled image + sizes. Both sizes are represented by &v4l2-rect;.</para> + + <para>Scaling support is optional. When supported by a subdev, + the crop rectangle on the subdev's sink pad is scaled to the + size configured using the &VIDIOC-SUBDEV-S-SELECTION; IOCTL + using <constant>V4L2_SUBDEV_SEL_COMPOSE_ACTUAL</constant> + selection target on the same pad. If the subdev supports scaling + but not composing, the top and left values are not used and must + always be set to zero.</para> + + <para>On source pads, cropping is similar to sink pads, with the + exception that the source size from which the cropping is + performed, is the COMPOSE rectangle on the sink pad. In both + sink and source pads, the crop rectangle must be entirely + contained inside the source image size for the crop + operation.</para> + + <para>The drivers should always use the closest possible + rectangle the user requests on all selection targets, unless + specifically told otherwise. + <constant>V4L2_SUBDEV_SEL_FLAG_SIZE_GE</constant> and + <constant>V4L2_SUBDEV_SEL_FLAG_SIZE_LE</constant> flags may be + used to round the image size either up or down. <xref + linkend="v4l2-subdev-selection-flags"></xref></para> + </section> + + <section> + <title>Types of selection targets</title> + + <section> + <title>ACTUAL targets</title> + + <para>ACTUAL targets reflect the actual hardware configuration + at any point of time. There is a BOUNDS target + corresponding to every ACTUAL.</para> + </section> + + <section> + <title>BOUNDS targets</title> + + <para>BOUNDS targets is the smallest rectangle that contains + all valid ACTUAL rectangles. It may not be possible to set the + ACTUAL rectangle as large as the BOUNDS rectangle, however. + This may be because e.g. a sensor's pixel array is not + rectangular but cross-shaped or round. The maximum size may + also be smaller than the BOUNDS rectangle.</para> + </section> - <para>Cropping behaviour on output pads is not defined.</para> + </section> + + <section> + <title>Order of configuration and format propagation</title> + + <para>Inside subdevs, the order of image processing steps will + always be from the sink pad towards the source pad. This is also + reflected in the order in which the configuration must be + performed by the user: the changes made will be propagated to + any subsequent stages. If this behaviour is not desired, the + user must set + <constant>V4L2_SUBDEV_SEL_FLAG_KEEP_CONFIG</constant> flag. This + flag causes no propagation of the changes are allowed in any + circumstances. This may also cause the accessed rectangle to be + adjusted by the driver, depending on the properties of the + underlying hardware.</para> + + <para>The coordinates to a step always refer to the actual size + of the previous step. The exception to this rule is the source + compose rectangle, which refers to the sink compose bounds + rectangle --- if it is supported by the hardware.</para> + + <orderedlist> + <listitem>Sink pad format. The user configures the sink pad + format. This format defines the parameters of the image the + entity receives through the pad for further processing.</listitem> + + <listitem>Sink pad actual crop selection. The sink pad crop + defines the crop performed to the sink pad format.</listitem> + + <listitem>Sink pad actual compose selection. The size of the + sink pad compose rectangle defines the scaling ratio compared + to the size of the sink pad crop rectangle. The location of + the compose rectangle specifies the location of the actual + sink compose rectangle in the sink compose bounds + rectangle.</listitem> + + <listitem>Source pad actual crop selection. Crop on the source + pad defines crop performed to the image in the sink compose + bounds rectangle.</listitem> + + <listitem>Source pad format. The source pad format defines the + output pixel format of the subdev, as well as the other + parameters with the exception of the image width and height. + Width and height are defined by the size of the source pad + actual crop selection.</listitem> + </orderedlist> + + <para>Accessing any of the above rectangles not supported by the + subdev will return <constant>EINVAL</constant>. Any rectangle + referring to a previous unsupported rectangle coordinates will + instead refer to the previous supported rectangle. For example, + if sink crop is not supported, the compose selection will refer + to the sink pad format dimensions instead.</para> + + <figure id="subdev-image-processing-crop"> + <title>Image processing in subdevs: simple crop example</title> + <mediaobject> + <imageobject> + <imagedata fileref="subdev-image-processing-crop.svg" + format="SVG" scale="200" /> + </imageobject> + </mediaobject> + </figure> + + <para>In the above example, the subdev supports cropping on its + sink pad. To configure it, the user sets the media bus format on + the subdev's sink pad. Now the actual crop rectangle can be set + on the sink pad --- the location and size of this rectangle + reflect the location and size of a rectangle to be cropped from + the sink format. The size of the sink crop rectangle will also + be the size of the format of the subdev's source pad.</para> + + <figure id="subdev-image-processing-scaling-multi-source"> + <title>Image processing in subdevs: scaling with multiple sources</title> + <mediaobject> + <imageobject> + <imagedata fileref="subdev-image-processing-scaling-multi-source.svg" + format="SVG" scale="200" /> + </imageobject> + </mediaobject> + </figure> + + <para>In this example, the subdev is capable of first cropping, + then scaling and finally cropping for two source pads + individually from the resulting scaled image. The location of + the scaled image in the cropped image is ignored in sink compose + target. Both of the locations of the source crop rectangles + refer to the sink scaling rectangle, independently cropping an + area at location specified by the source crop rectangle from + it.</para> + + <figure id="subdev-image-processing-full"> + <title>Image processing in subdevs: scaling and composition + with multiple sinks and sources</title> + <mediaobject> + <imageobject> + <imagedata fileref="subdev-image-processing-full.svg" + format="SVG" scale="200" /> + </imageobject> + </mediaobject> + </figure> + + <para>The subdev driver supports two sink pads and two source + pads. The images from both of the sink pads are individually + cropped, then scaled and further composed on the composition + bounds rectangle. From that, two independent streams are cropped + and sent out of the subdev from the source pads.</para> </section> + </section> &sub-subdev-formats; diff --git a/Documentation/DocBook/media/v4l/subdev-image-processing-crop.dia b/Documentation/DocBook/media/v4l/subdev-image-processing-crop.dia new file mode 100644 index 00000000000..e32ba5362e1 --- /dev/null +++ b/Documentation/DocBook/media/v4l/subdev-image-processing-crop.dia @@ -0,0 +1,614 @@ +<?xml version="1.0" encoding="UTF-8"?> +<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/"> + <dia:diagramdata> + <dia:attribute name="background"> + <dia:color val="#ffffff"/> + </dia:attribute> + <dia:attribute name="pagebreak"> + <dia:color val="#000099"/> + </dia:attribute> + <dia:attribute name="paper"> + <dia:composite type="paper"> + <dia:attribute name="name"> + <dia:string>#A4#</dia:string> + </dia:attribute> + <dia:attribute name="tmargin"> + <dia:real val="2.8222000598907471"/> + </dia:attribute> + <dia:attribute name="bmargin"> + <dia:real val="2.8222000598907471"/> + </dia:attribute> + <dia:attribute name="lmargin"> + <dia:real val="2.8222000598907471"/> + </dia:attribute> + <dia:attribute name="rmargin"> + <dia:real val="2.8222000598907471"/> + </dia:attribute> + <dia:attribute name="is_portrait"> + <dia:boolean val="false"/> + </dia:attribute> + <dia:attribute name="scaling"> + <dia:real val="0.49000000953674316"/> + </dia:attribute> + <dia:attribute name="fitto"> + <dia:boolean val="false"/> + </dia:attribute> + </dia:composite> + </dia:attribute> + <dia:attribute name="grid"> + <dia:composite type="grid"> + <dia:attribute name="width_x"> + <dia:real val="1"/> + </dia:attribute> + <dia:attribute name="width_y"> + <dia:real val="1"/> + </dia:attribute> + <dia:attribute name="visible_x"> + <dia:int val="1"/> + </dia:attribute> + <dia:attribute name="visible_y"> + <dia:int val="1"/> + </dia:attribute> + <dia:composite type="color"/> + </dia:composite> + </dia:attribute> + <dia:attribute name="color"> + <dia:color val="#d8e5e5"/> + </dia:attribute> + <dia:attribute name="guides"> + <dia:composite type="guides"> + <dia:attribute name="hguides"/> + <dia:attribute name="vguides"/> + </dia:composite> + </dia:attribute> + </dia:diagramdata> + <dia:layer name="Background" visible="true" active="true"> + <dia:object type="Standard - Box" version="0" id="O0"> + <dia:attribute name="obj_pos"> + <dia:point val="-0.4,6.5"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="-0.45,6.45;23.1387,16.2"/> + </dia:attribute> + <dia:attribute name="elem_corner"> + <dia:point val="-0.4,6.5"/> + </dia:attribute> + <dia:attribute name="elem_width"> + <dia:real val="23.48871579904775"/> + </dia:attribute> + <dia:attribute name="elem_height"> + <dia:real val="9.6500000000000004"/> + </dia:attribute> + <dia:attribute name="border_width"> + <dia:real val="0.10000000149011612"/> + </dia:attribute> + <dia:attribute name="show_background"> + <dia:boolean val="false"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Box" version="0" id="O1"> + <dia:attribute name="obj_pos"> + <dia:point val="0.225,9.45"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="0.175,9.4;8.225,14.7"/> + </dia:attribute> + <dia:attribute name="elem_corner"> + <dia:point val="0.225,9.45"/> + </dia:attribute> + <dia:attribute name="elem_width"> + <dia:real val="7.9499999999999975"/> + </dia:attribute> + <dia:attribute name="elem_height"> + <dia:real val="5.1999999999999975"/> + </dia:attribute> + <dia:attribute name="border_width"> + <dia:real val="0.10000000149011612"/> + </dia:attribute> + <dia:attribute name="border_color"> + <dia:color val="#a52a2a"/> + </dia:attribute> + <dia:attribute name="show_background"> + <dia:boolean val="true"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Box" version="0" id="O2"> + <dia:attribute name="obj_pos"> + <dia:point val="3.175,10.55"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="3.125,10.5;7.925,14.45"/> + </dia:attribute> + <dia:attribute name="elem_corner"> + <dia:point val="3.175,10.55"/> + </dia:attribute> + <dia:attribute name="elem_width"> + <dia:real val="4.6999999999999975"/> + </dia:attribute> + <dia:attribute name="elem_height"> + <dia:real val="3.8499999999999979"/> + </dia:attribute> + <dia:attribute name="border_width"> + <dia:real val="0.10000000149011612"/> + </dia:attribute> + <dia:attribute name="border_color"> + <dia:color val="#0000ff"/> + </dia:attribute> + <dia:attribute name="show_background"> + <dia:boolean val="true"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Text" version="1" id="O3"> + <dia:attribute name="obj_pos"> + <dia:point val="3.725,11.3875"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="3.725,10.7925;6.6025,13.14"/> + </dia:attribute> + <dia:attribute name="text"> + <dia:composite type="text"> + <dia:attribute name="string"> + <dia:string>#sink +crop +selection#</dia:string> + </dia:attribute> + <dia:attribute name="font"> + <dia:font family="sans" style="0" name="Helvetica"/> + </dia:attribute> + <dia:attribute name="height"> + <dia:real val="0.80000000000000004"/> + </dia:attribute> + <dia:attribute name="pos"> + <dia:point val="3.725,11.3875"/> + </dia:attribute> + <dia:attribute name="color"> + <dia:color val="#0000ff"/> + </dia:attribute> + <dia:attribute name="alignment"> + <dia:enum val="0"/> + </dia:attribute> + </dia:composite> + </dia:attribute> + <dia:attribute name="valign"> + <dia:enum val="3"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Text" version="1" id="O4"> + <dia:attribute name="obj_pos"> + <dia:point val="1.475,7.9"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="1.475,7.305;1.475,8.0525"/> + </dia:attribute> + <dia:attribute name="text"> + <dia:composite type="text"> + <dia:attribute name="string"> + <dia:string>##</dia:string> + </dia:attribute> + <dia:attribute name="font"> + <dia:font family="sans" style="0" name="Helvetica"/> + </dia:attribute> + <dia:attribute name="height"> + <dia:real val="0.80000000000000004"/> + </dia:attribute> + <dia:attribute name="pos"> + <dia:point val="1.475,7.9"/> + </dia:attribute> + <dia:attribute name="color"> + <dia:color val="#000000"/> + </dia:attribute> + <dia:attribute name="alignment"> + <dia:enum val="0"/> + </dia:attribute> + </dia:composite> + </dia:attribute> + <dia:attribute name="valign"> + <dia:enum val="3"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Text" version="1" id="O5"> + <dia:attribute name="obj_pos"> + <dia:point val="0.426918,7.89569"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="0.426918,7.30069;3.90942,8.84819"/> + </dia:attribute> + <dia:attribute name="text"> + <dia:composite type="text"> + <dia:attribute name="string"> + <dia:string>#sink media +bus format#</dia:string> + </dia:attribute> + <dia:attribute name="font"> + <dia:font family="sans" style="0" name="Helvetica"/> + </dia:attribute> + <dia:attribute name="height"> + <dia:real val="0.80000000000000004"/> + </dia:attribute> + <dia:attribute name="pos"> + <dia:point val="0.426918,7.89569"/> + </dia:attribute> + <dia:attribute name="color"> + <dia:color val="#a52a2a"/> + </dia:attribute> + <dia:attribute name="alignment"> + <dia:enum val="0"/> + </dia:attribute> + </dia:composite> + </dia:attribute> + <dia:attribute name="valign"> + <dia:enum val="3"/> + </dia:attribute> + </dia:object> + <dia:object type="Standard - Text" version="1" id="O6"> + <dia:attribute name="obj_pos"> + <dia:point val="17.4887,7.75"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="17.4887,7.155;21.8112,8.7025"/> + </dia:attribute> + <dia:attribute name="text"> + <dia:composite type="text"> + <dia:attribute name="string"> + <dia:string>#source media +bus format#</dia:string> + </dia:attribute> + <dia:attribute 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<dia:connection handle="0" to="O7" connection="5"/> + <dia:connection handle="1" to="O2" connection="5"/> + </dia:connections> + </dia:object> + <dia:object type="Standard - Line" version="0" id="O9"> + <dia:attribute name="obj_pos"> + <dia:point val="17.5244,9.5417"/> + </dia:attribute> + <dia:attribute name="obj_bb"> + <dia:rectangle val="3.12162,9.48832;17.5778,10.6034"/> + </dia:attribute> + <dia:attribute name="conn_endpoints"> + <dia:point val="17.5244,9.5417"/> + <dia:point val="3.175,10.55"/> + </dia:attribute> + <dia:attribute name="numcp"> + <dia:int val="1"/> + </dia:attribute> + <dia:attribute name="line_color"> + <dia:color val="#e60505"/> + </dia:attribute> + <dia:attribute name="line_style"> + <dia:enum val="4"/> + </dia:attribute> + <dia:connections> + <dia:connection handle="0" to="O7" connection="0"/> + <dia:connection handle="1" to="O2" connection="0"/> + </dia:connections> + </dia:object> + <dia:object type="Standard - Line" version="0" id="O10"> + <dia:attribute 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<firstname>Sakari</firstname> + <surname>Ailus</surname> + <contrib>Subdev selections API.</contrib> + <affiliation> + <address> + <email>sakari.ailus@iki.fi</email> + </address> + </affiliation> + </author> </authorgroup> <copyright> @@ -128,6 +139,15 @@ structs, ioctls) must be noted in more detail in the history chapter applications. --> <revision> + <revnumber>3.5</revnumber> + <date>2012-04-02</date> + <authorinitials>sa</authorinitials> + <revremark>Added V4L2_CTRL_TYPE_INTEGER_MENU and V4L2 subdev + selections API. + </revremark> + </revision> + + <revision> <revnumber>3.4</revnumber> <date>2012-01-25</date> <authorinitials>sn</authorinitials> @@ -540,6 +560,7 @@ and discussions on the V4L mailing list.</revremark> &sub-subdev-g-crop; &sub-subdev-g-fmt; &sub-subdev-g-frame-interval; + &sub-subdev-g-selection; &sub-subscribe-event; <!-- End of ioctls. --> &sub-mmap; diff --git a/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml index b17a7aac699..27e20bcbdf4 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml @@ -265,6 +265,13 @@ These controls are described in <xref These controls are described in <xref linkend="flash-controls" />.</entry> </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_JPEG</constant></entry> + <entry>0x9d0000</entry> + <entry>The class containing JPEG compression controls. +These controls are described in <xref + linkend="jpeg-controls" />.</entry> + </row> </tbody> </tgroup> </table> diff --git a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml index 36660d311b5..505f0206e5b 100644 --- a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml +++ b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml @@ -215,11 +215,12 @@ the array to zero.</entry> <table pgwide="1" frame="none" id="v4l2-querymenu"> <title>struct <structname>v4l2_querymenu</structname></title> - <tgroup cols="3"> + <tgroup cols="4"> &cs-str; <tbody valign="top"> <row> <entry>__u32</entry> + <entry></entry> <entry><structfield>id</structfield></entry> <entry>Identifies the control, set by the application from the respective &v4l2-queryctrl; @@ -227,18 +228,38 @@ from the respective &v4l2-queryctrl; </row> <row> <entry>__u32</entry> + <entry></entry> <entry><structfield>index</structfield></entry> <entry>Index of the menu item, starting at zero, set by the application.</entry> </row> <row> + <entry>union</entry> + <entry></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> <entry>__u8</entry> <entry><structfield>name</structfield>[32]</entry> <entry>Name of the menu item, a NUL-terminated ASCII -string. This information is intended for the user.</entry> +string. This information is intended for the user. This field is valid +for <constant>V4L2_CTRL_FLAG_MENU</constant> type controls.</entry> + </row> + <row> + <entry></entry> + <entry>__s64</entry> + <entry><structfield>value</structfield></entry> + <entry> + Value of the integer menu item. This field is valid for + <constant>V4L2_CTRL_FLAG_INTEGER_MENU</constant> type + controls. + </entry> </row> <row> <entry>__u32</entry> + <entry></entry> <entry><structfield>reserved</structfield></entry> <entry>Reserved for future extensions. Drivers must set the array to zero.</entry> @@ -292,6 +313,20 @@ the menu items can be enumerated with the <constant>VIDIOC_QUERYMENU</constant> ioctl.</entry> </row> <row> + <entry><constant>V4L2_CTRL_TYPE_INTEGER_MENU</constant></entry> + <entry>≥ 0</entry> + <entry>1</entry> + <entry>N-1</entry> + <entry> + The control has a menu of N choices. The values of the + menu items can be enumerated with the + <constant>VIDIOC_QUERYMENU</constant> ioctl. This is + similar to <constant>V4L2_CTRL_TYPE_MENU</constant> + except that instead of strings, the menu items are + signed 64-bit integers. + </entry> + </row> + <row> <entry><constant>V4L2_CTRL_TYPE_BITMASK</constant></entry> <entry>0</entry> <entry>n/a</entry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml index 06197323a8c..4cddd788c58 100644 --- a/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml @@ -58,9 +58,12 @@ <title>Description</title> <note> - <title>Experimental</title> - <para>This is an <link linkend="experimental">experimental</link> - interface and may change in the future.</para> + <title>Obsolete</title> + + <para>This is an <link linkend="obsolete">obsolete</link> + interface and may be removed in the future. It is superseded by + <link linkend="vidioc-subdev-g-selection">the selection + API</link>.</para> </note> <para>To retrieve the current crop rectangle applications set the diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-selection.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-selection.xml new file mode 100644 index 00000000000..208e9f0da3f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-g-selection.xml @@ -0,0 +1,228 @@ +<refentry id="vidioc-subdev-g-selection"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_G_SELECTION, VIDIOC_SUBDEV_S_SELECTION</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_G_SELECTION</refname> + <refname>VIDIOC_SUBDEV_S_SELECTION</refname> + <refpurpose>Get or set selection rectangles on a subdev pad</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_selection *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_G_SELECTION, VIDIOC_SUBDEV_S_SELECTION</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</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 selections are used to configure various image + processing functionality performed by the subdevs which affect the + image size. This currently includes cropping, scaling and + composition.</para> + + <para>The selection API replaces <link + linkend="vidioc-subdev-g-crop">the old subdev crop API</link>. All + the function of the crop API, and more, are supported by the + selections API.</para> + + <para>See <xref linkend="subdev"></xref> for + more information on how each selection target affects the image + processing pipeline inside the subdevice.</para> + + <section> + <title>Types of selection targets</title> + + <para>There are two types of selection targets: actual and bounds. + The ACTUAL targets are the targets which configure the hardware. + The BOUNDS target will return a rectangle that contain all + possible ACTUAL rectangles.</para> + </section> + + <section> + <title>Discovering supported features</title> + + <para>To discover which targets are supported, the user can + perform <constant>VIDIOC_SUBDEV_G_SELECTION</constant> on them. + Any unsupported target will return + <constant>EINVAL</constant>.</para> + </section> + + <table pgwide="1" frame="none" id="v4l2-subdev-selection-targets"> + <title>V4L2 subdev selection targets</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_SUBDEV_SEL_TGT_CROP_ACTUAL</constant></entry> + <entry>0x0000</entry> + <entry>Actual crop. Defines the cropping + performed by the processing step.</entry> + </row> + <row> + <entry><constant>V4L2_SUBDEV_SEL_TGT_CROP_BOUNDS</constant></entry> + <entry>0x0002</entry> + <entry>Bounds of the crop rectangle.</entry> + </row> + <row> + <entry><constant>V4L2_SUBDEV_SEL_TGT_COMPOSE_ACTUAL</constant></entry> + <entry>0x0100</entry> + <entry>Actual compose rectangle. Used to configure scaling + on sink pads and composition on source pads.</entry> + </row> + <row> + <entry><constant>V4L2_SUBDEV_SEL_TGT_COMPOSE_BOUNDS</constant></entry> + <entry>0x0102</entry> + <entry>Bounds of the compose rectangle.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-subdev-selection-flags"> + <title>V4L2 subdev selection flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_SUBDEV_SEL_FLAG_SIZE_GE</constant></entry> + <entry>(1 << 0)</entry> <entry>Suggest the driver it + should choose greater or equal rectangle (in size) than + was requested. Albeit the driver may choose a lesser size, + it will only do so due to hardware limitations. Without + this flag (and + <constant>V4L2_SUBDEV_SEL_FLAG_SIZE_LE</constant>) the + behaviour is to choose the closest possible + rectangle.</entry> + </row> + <row> + <entry><constant>V4L2_SUBDEV_SEL_FLAG_SIZE_LE</constant></entry> + <entry>(1 << 1)</entry> <entry>Suggest the driver it + should choose lesser or equal rectangle (in size) than was + requested. Albeit the driver may choose a greater size, it + will only do so due to hardware limitations.</entry> + </row> + <row> + <entry><constant>V4L2_SUBDEV_SEL_FLAG_KEEP_CONFIG</constant></entry> + <entry>(1 << 2)</entry> + <entry>The configuration should not be propagated to any + further processing steps. If this flag is not given, the + configuration is propagated inside the subdevice to all + further processing steps.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-subdev-selection"> + <title>struct <structname>v4l2_subdev_selection</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>which</structfield></entry> + <entry>Active or try selection, from + &v4l2-subdev-format-whence;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media framework.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>target</structfield></entry> + <entry>Target selection rectangle. See + <xref linkend="v4l2-subdev-selection-targets">.</xref>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Flags. See + <xref linkend="v4l2-subdev-selection-flags">.</xref></entry> + </row> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>rect</structfield></entry> + <entry>Selection rectangle, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The selection rectangle can't be changed because the + pad is currently busy. This can be caused, for instance, by + an active video stream on the pad. The ioctl must not be + retried without performing another action to fix the problem + first. Only returned by + <constant>VIDIOC_SUBDEV_S_SELECTION</constant></para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-selection; + <structfield>pad</structfield> references a non-existing + pad, the <structfield>which</structfield> field references a + non-existing format, or the selection target is not + supported on the given subdev pad.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> |
