<para>Applications can make use of the <xref linkend="input-capabilities" /> and
<xref linkend="output-capabilities"/> flags to determine whether the video standard ioctls
are available for the device.</para>
-&ENOTTY;.
+
<para>See <xref linkend="buffer" /> for a rationale. Probably
even USB cameras follow some well known video standard. It might have
been better to explicitly indicate elsewhere if a device cannot live
<note>
<title>Experimental</title>
- <para>This is an <link linkend="experimental"> experimental </link>
+ <para>This is an <link linkend="experimental">experimental</link>
interface and may change in the future.</para>
</note>
different or the same device (known as the importer role), or both. This
section describes the DMABUF importer role API in V4L2.</para>
- <para>Refer to <link linked="vidioc-expbuf"> DMABUF exporting </link> for
+ <para>Refer to <link linkend="vidioc-expbuf">DMABUF exporting</link> for
details about exporting V4L2 buffers as DMABUF file descriptors.</para>
<para>Input and output devices support the streaming I/O method when the
formats with 10 bits per color compressed to 8 bits each,
using the A-LAW algorithm. Each color component consumes 8
bits of memory. In other respects this format is similar to
- <xref linkend="V4L2-PIX-FMT-SRGGB8">.</xref></para>
+ <xref linkend="V4L2-PIX-FMT-SRGGB8"></xref>.</para>
</refsect1>
</refentry>
<revnumber>3.9</revnumber>
<date>2012-12-03</date>
<authorinitials>sa, sn</authorinitials>
- <revremark>Added timestamp types to
- <structname>v4l2_buffer</structname>, see <xref
- linkend="buffer-flags" />.
+ <revremark>Added timestamp types to v4l2_buffer.
Added <constant>V4L2_EVENT_CTRL_CH_RANGE</constant> control
event changes flag, see <xref linkend="changes-flags"/>.
</revremark>
<link linkend="dmabuf">DMABUF importing</link> for details about importing
DMABUF files into V4L2 nodes. It is recommended to close a DMABUF file when it
is no longer used to allow the associated memory to be reclaimed. </para>
-
</refsect1>
+
<refsect1>
- <section>
- <title>Examples</title>
+ <title>Examples</title>
- <example>
- <title>Exporting a buffer.</title>
- <programlisting>
+ <example>
+ <title>Exporting a buffer.</title>
+ <programlisting>
int buffer_export(int v4lfd, &v4l2-buf-type; bt, int index, int *dmafd)
{
&v4l2-exportbuffer; expbuf;
return 0;
}
- </programlisting>
- </example>
+ </programlisting>
+ </example>
- <example>
- <title>Exporting a buffer using the multi-planar API.</title>
- <programlisting>
+ <example>
+ <title>Exporting a buffer using the multi-planar API.</title>
+ <programlisting>
int buffer_export_mp(int v4lfd, &v4l2-buf-type; bt, int index,
int dmafd[], int n_planes)
{
return 0;
}
- </programlisting>
- </example>
- </section>
- </refsect1>
+ </programlisting>
+ </example>
- <refsect1>
<table pgwide="1" frame="none" id="v4l2-exportbuffer">
<title>struct <structname>v4l2_exportbuffer</structname></title>
<tgroup cols="3">