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The API reference documents that the KEEP_CONFIG flag tells the configuration should not be propagated by the driver whereas the interface documentation (dev-subdev.xml) prohibited any changes to the rest of the pipeline. Resolve the conflict by changing the API reference to disallow changes. Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
165 lines
5.1 KiB
XML
165 lines
5.1 KiB
XML
<section id="v4l2-selections-common">
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<title>Common selection definitions</title>
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<para>While the <link linkend="selection-api">V4L2 selection
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API</link> and <link linkend="v4l2-subdev-selections">V4L2 subdev
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selection APIs</link> are very similar, there's one fundamental
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difference between the two. On sub-device API, the selection
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rectangle refers to the media bus format, and is bound to a
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sub-device's pad. On the V4L2 interface the selection rectangles
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refer to the in-memory pixel format.</para>
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<para>This section defines the common definitions of the
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selection interfaces on the two APIs.</para>
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<section id="v4l2-selection-targets">
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<title>Selection targets</title>
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<para>The precise meaning of the selection targets may be
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dependent on which of the two interfaces they are used.</para>
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<table pgwide="1" frame="none" id="v4l2-selection-targets-table">
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<title>Selection target definitions</title>
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<tgroup cols="5">
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<colspec colname="c1" />
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<colspec colname="c2" />
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<colspec colname="c3" />
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<colspec colname="c4" />
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<colspec colname="c5" />
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&cs-def;
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<thead>
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<row rowsep="1">
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<entry align="left">Target name</entry>
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<entry align="left">id</entry>
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<entry align="left">Definition</entry>
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<entry align="left">Valid for V4L2</entry>
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<entry align="left">Valid for V4L2 subdev</entry>
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</row>
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</thead>
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_SEL_TGT_CROP</constant></entry>
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<entry>0x0000</entry>
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<entry>Crop rectangle. Defines the cropped area.</entry>
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<entry>Yes</entry>
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<entry>Yes</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_TGT_CROP_DEFAULT</constant></entry>
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<entry>0x0001</entry>
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<entry>Suggested cropping rectangle that covers the "whole picture".</entry>
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<entry>Yes</entry>
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<entry>No</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_TGT_CROP_BOUNDS</constant></entry>
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<entry>0x0002</entry>
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<entry>Bounds of the crop rectangle. All valid crop
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rectangles fit inside the crop bounds rectangle.
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</entry>
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<entry>Yes</entry>
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<entry>Yes</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_TGT_COMPOSE</constant></entry>
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<entry>0x0100</entry>
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<entry>Compose rectangle. Used to configure scaling
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and composition.</entry>
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<entry>Yes</entry>
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<entry>Yes</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_TGT_COMPOSE_DEFAULT</constant></entry>
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<entry>0x0101</entry>
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<entry>Suggested composition rectangle that covers the "whole picture".</entry>
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<entry>Yes</entry>
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<entry>No</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_TGT_COMPOSE_BOUNDS</constant></entry>
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<entry>0x0102</entry>
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<entry>Bounds of the compose rectangle. All valid compose
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rectangles fit inside the compose bounds rectangle.</entry>
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<entry>Yes</entry>
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<entry>Yes</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_TGT_COMPOSE_PADDED</constant></entry>
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<entry>0x0103</entry>
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<entry>The active area and all padding pixels that are inserted or
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modified by hardware.</entry>
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<entry>Yes</entry>
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<entry>No</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</section>
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<section id="v4l2-selection-flags">
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<title>Selection flags</title>
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<table pgwide="1" frame="none" id="v4l2-selection-flags-table">
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<title>Selection flag definitions</title>
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<tgroup cols="5">
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<colspec colname="c1" />
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<colspec colname="c2" />
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<colspec colname="c3" />
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<colspec colname="c4" />
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<colspec colname="c5" />
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&cs-def;
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<thead>
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<row rowsep="1">
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<entry align="left">Flag name</entry>
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<entry align="left">id</entry>
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<entry align="left">Definition</entry>
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<entry align="left">Valid for V4L2</entry>
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<entry align="left">Valid for V4L2 subdev</entry>
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</row>
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</thead>
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<tbody valign="top">
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<row>
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<entry><constant>V4L2_SEL_FLAG_GE</constant></entry>
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<entry>(1 << 0)</entry>
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<entry>Suggest the driver it should choose greater or
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equal rectangle (in size) than was requested. Albeit the
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driver may choose a lesser size, it will only do so due to
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hardware limitations. Without this flag (and
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<constant>V4L2_SEL_FLAG_LE</constant>) the
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behaviour is to choose the closest possible
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rectangle.</entry>
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<entry>Yes</entry>
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<entry>Yes</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_FLAG_LE</constant></entry>
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<entry>(1 << 1)</entry>
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<entry>Suggest the driver it
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should choose lesser or equal rectangle (in size) than was
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requested. Albeit the driver may choose a greater size, it
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will only do so due to hardware limitations.</entry>
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<entry>Yes</entry>
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<entry>Yes</entry>
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</row>
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<row>
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<entry><constant>V4L2_SEL_FLAG_KEEP_CONFIG</constant></entry>
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<entry>(1 << 2)</entry>
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<entry>The configuration must not be propagated to any
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further processing steps. If this flag is not given, the
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configuration is propagated inside the subdevice to all
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further processing steps.</entry>
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<entry>No</entry>
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<entry>Yes</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</section>
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</section>
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