85 lines
2.6 KiB
XML
85 lines
2.6 KiB
XML
<refentry id="media-ioc-setup-link">
|
|
<refmeta>
|
|
<refentrytitle>ioctl MEDIA_IOC_SETUP_LINK</refentrytitle>
|
|
&manvol;
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>MEDIA_IOC_SETUP_LINK</refname>
|
|
<refpurpose>Modify the properties of a link</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 media_link_desc *<parameter>argp</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Arguments</title>
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>fd</parameter></term>
|
|
<listitem>
|
|
<para>File descriptor returned by
|
|
<link linkend='media-func-open'><function>open()</function></link>.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>request</parameter></term>
|
|
<listitem>
|
|
<para>MEDIA_IOC_SETUP_LINK</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>argp</parameter></term>
|
|
<listitem>
|
|
<para></para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para>To change link properties applications fill a &media-link-desc; with
|
|
link identification information (source and sink pad) and the new requested
|
|
link flags. They then call the MEDIA_IOC_SETUP_LINK ioctl with a pointer to
|
|
that structure.</para>
|
|
<para>The only configurable property is the <constant>ENABLED</constant>
|
|
link flag to enable/disable a link. Links marked with the
|
|
<constant>IMMUTABLE</constant> link flag can not be enabled or disabled.
|
|
</para>
|
|
<para>Link configuration has no side effect on other links. If an enabled
|
|
link at the sink pad prevents the link from being enabled, the driver
|
|
returns with an &EBUSY;.</para>
|
|
<para>Only links marked with the <constant>DYNAMIC</constant> link flag can
|
|
be enabled/disabled while streaming media data. Attempting to enable or
|
|
disable a streaming non-dynamic link will return an &EBUSY;.</para>
|
|
<para>If the specified link can't be found the driver returns with an
|
|
&EINVAL;.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
&return-value;
|
|
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><errorcode>EINVAL</errorcode></term>
|
|
<listitem>
|
|
<para>The &media-link-desc; references a non-existing link, or the
|
|
link is immutable and an attempt to modify its configuration was made.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
</refentry>
|