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Diffstat (limited to 'Documentation/DocBook/media/v4l/dev-subdev.xml')
| -rw-r--r-- | Documentation/DocBook/media/v4l/dev-subdev.xml | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/Documentation/DocBook/media/v4l/dev-subdev.xml b/Documentation/DocBook/media/v4l/dev-subdev.xml index 4afcbbec5ed..d15aaf83f56 100644 --- a/Documentation/DocBook/media/v4l/dev-subdev.xml +++ b/Documentation/DocBook/media/v4l/dev-subdev.xml @@ -276,7 +276,7 @@ </para> </section> - <section> + <section id="v4l2-subdev-selections"> <title>Selections: cropping, scaling and composition</title> <para>Many sub-devices support cropping frames on their input or output @@ -290,8 +290,8 @@ size. Both the coordinates and sizes are expressed in pixels.</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> + rectangles for the selection targets <xref + linkend="v4l2-selections-common" />.</para> <para>On sink pads, cropping is applied relative to the current pad format. The pad format represents the image size as @@ -308,7 +308,7 @@ <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> + using <constant>V4L2_SEL_TGT_COMPOSE</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> @@ -323,32 +323,32 @@ <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 + <constant>V4L2_SEL_FLAG_GE</constant> and + <constant>V4L2_SEL_FLAG_LE</constant> flags may be used to round the image size either up or down. <xref - linkend="v4l2-subdev-selection-flags"></xref></para> + linkend="v4l2-selection-flags" /></para> </section> <section> <title>Types of selection targets</title> <section> - <title>ACTUAL targets</title> + <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> + <para>Actual targets (without a postfix) reflect the actual + hardware configuration at any point of time. There is a BOUNDS + target corresponding to every actual target.</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> + <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> </section> @@ -362,7 +362,7 @@ 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 + <constant>V4L2_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 @@ -374,29 +374,29 @@ rectangle --- if it is supported by the hardware.</para> <orderedlist> - <listitem>Sink pad format. The user configures the sink pad + <listitem><para>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> + entity receives through the pad for further processing.</para></listitem> - <listitem>Sink pad actual crop selection. The sink pad crop - defines the crop performed to the sink pad format.</listitem> + <listitem><para>Sink pad actual crop selection. The sink pad crop + defines the crop performed to the sink pad format.</para></listitem> - <listitem>Sink pad actual compose selection. The size of the + <listitem><para>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> + rectangle.</para></listitem> - <listitem>Source pad actual crop selection. Crop on the source + <listitem><para>Source pad actual crop selection. Crop on the source pad defines crop performed to the image in the sink compose - bounds rectangle.</listitem> + bounds rectangle.</para></listitem> - <listitem>Source pad format. The source pad format defines the + <listitem><para>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> + actual crop selection.</para></listitem> </orderedlist> <para>Accessing any of the above rectangles not supported by the |