4266129964
This patch addresses several issues pointed by Randy Dunlap <rdunlap@xenotime.net> at changeset ece722c: - In the generated index.html file, "media" is listed first, but it should be listed in alphabetical order, not first. - The generated files are (hidden) in .tmpmedia/ - The link from the top-level index.html file to "media" is to media/index.html, but the file is actually in .tmpmedia/media/index.html - Please build docs with and without using "O=builddir" and test that. - Would it be possible for media to have its own Makefile instead of merging into this one? Due to the way cleandocs target works, I had to rename the media DocBook to media_api, otherwise cleandocs would remove the /media directory. Thanks-to: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
154 lines
4.9 KiB
XML
154 lines
4.9 KiB
XML
<refentry id="vidioc-subdev-enum-frame-size">
|
|
<refmeta>
|
|
<refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_FRAME_SIZE</refentrytitle>
|
|
&manvol;
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>VIDIOC_SUBDEV_ENUM_FRAME_SIZE</refname>
|
|
<refpurpose>Enumerate media bus frame sizes</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_frame_size_enum *
|
|
<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_ENUM_FRAME_SIZE</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>This ioctl allows applications to enumerate all frame sizes
|
|
supported by a sub-device on the given pad for the given media bus format.
|
|
Supported formats can be retrieved with the &VIDIOC-SUBDEV-ENUM-MBUS-CODE;
|
|
ioctl.</para>
|
|
|
|
<para>To enumerate frame sizes applications initialize the
|
|
<structfield>pad</structfield>, <structfield>code</structfield> and
|
|
<structfield>index</structfield> fields of the
|
|
&v4l2-subdev-mbus-code-enum; and call the
|
|
<constant>VIDIOC_SUBDEV_ENUM_FRAME_SIZE</constant> ioctl with a pointer to
|
|
the structure. Drivers fill the minimum and maximum frame sizes or return
|
|
an &EINVAL; if one of the input parameters is invalid.</para>
|
|
|
|
<para>Sub-devices that only support discrete frame sizes (such as most
|
|
sensors) will return one or more frame sizes with identical minimum and
|
|
maximum values.</para>
|
|
|
|
<para>Not all possible sizes in given [minimum, maximum] ranges need to be
|
|
supported. For instance, a scaler that uses a fixed-point scaling ratio
|
|
might not be able to produce every frame size between the minimum and
|
|
maximum values. Applications must use the &VIDIOC-SUBDEV-S-FMT; ioctl to
|
|
try the sub-device for an exact supported frame size.</para>
|
|
|
|
<para>Available frame sizes may depend on the current 'try' formats at other
|
|
pads of the sub-device, as well as on the current active links and the
|
|
current values of V4L2 controls. See &VIDIOC-SUBDEV-G-FMT; for more
|
|
information about try formats.</para>
|
|
|
|
<table pgwide="1" frame="none" id="v4l2-subdev-frame-size-enum">
|
|
<title>struct <structname>v4l2_subdev_frame_size_enum</structname></title>
|
|
<tgroup cols="3">
|
|
&cs-str;
|
|
<tbody valign="top">
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>index</structfield></entry>
|
|
<entry>Number of the format in the enumeration, set by the
|
|
application.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>pad</structfield></entry>
|
|
<entry>Pad number as reported by the media controller API.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>code</structfield></entry>
|
|
<entry>The media bus format code, as defined in
|
|
<xref linkend="v4l2-mbus-format" />.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>min_width</structfield></entry>
|
|
<entry>Minimum frame width, in pixels.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>max_width</structfield></entry>
|
|
<entry>Maximum frame width, in pixels.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>min_height</structfield></entry>
|
|
<entry>Minimum frame height, in pixels.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>max_height</structfield></entry>
|
|
<entry>Maximum frame height, in pixels.</entry>
|
|
</row>
|
|
<row>
|
|
<entry>__u32</entry>
|
|
<entry><structfield>reserved</structfield>[9]</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>EINVAL</errorcode></term>
|
|
<listitem>
|
|
<para>The &v4l2-subdev-frame-size-enum; <structfield>pad</structfield>
|
|
references a non-existing pad, the <structfield>code</structfield> is
|
|
invalid for the given pad or the <structfield>index</structfield>
|
|
field is out of bounds.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
</refentry>
|