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ec8f3386a7
As reminded by Jonathan, several places where emphasys role="tt" were used are actually trying to change the font to monospaced. We do that, on other places, by using the constant tag. So, use it here too. Reported-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
239 lines
6.7 KiB
XML
239 lines
6.7 KiB
XML
<title>DVB Network API</title>
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<para>The DVB net device controls the mapping of data packages that are
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part of a transport stream to be mapped into a virtual network interface,
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visible through the standard Linux network protocol stack.</para>
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<para>Currently, two encapsulations are supported:</para>
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<itemizedlist>
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<listitem><para><ulink url="http://en.wikipedia.org/wiki/Multiprotocol_Encapsulation">
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Multi Protocol Encapsulation (MPE)</ulink></para></listitem>
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<listitem><para><ulink url="http://en.wikipedia.org/wiki/Unidirectional_Lightweight_Encapsulation">
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Ultra Lightweight Encapsulation (ULE)</ulink></para></listitem>
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</itemizedlist>
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<para>In order to create the Linux virtual network interfaces, an application
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needs to tell to the Kernel what are the PIDs and the encapsulation types
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that are present on the transport stream. This is done through
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<constant>/dev/dvb/adapter?/net?</constant> device node.
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The data will be available via virtual <constant>dvb?_?</constant>
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network interfaces, and will be controled/routed via the standard
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ip tools (like ip, route, netstat, ifconfig, etc).</para>
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<para> Data types and and ioctl definitions are defined via
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<constant>linux/dvb/net.h</constant> header.</para>
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<section id="net_fcalls">
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<title>DVB net Function Calls</title>
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<refentry id="NET_ADD_IF">
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<refmeta>
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<refentrytitle>ioctl NET_ADD_IF</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>NET_ADD_IF</refname>
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<refpurpose>Creates a new network interface for a given Packet ID.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>struct dvb_net_if *<parameter>net_if</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>&fe_fd;</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>FE_SET_TONE</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>net_if</parameter></term>
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<listitem>
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<para>pointer to &dvb-net-if;</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>The NET_ADD_IF ioctl system call selects the Packet ID (PID) that
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contains a TCP/IP traffic, the type of encapsulation to be used (MPE or ULE)
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and the interface number for the new interface to be created. When the
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system call successfully returns, a new virtual network interface is created.</para>
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<para>The &dvb-net-if;::ifnum field will be filled with the number of the
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created interface.</para>
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&return-value-dvb;
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</refsect1>
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<refsect1 id="dvb-net-if-t">
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<title>struct <structname>dvb_net_if</structname> description</title>
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<table pgwide="1" frame="none" id="dvb-net-if">
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<title>struct <structname>dvb_net_if</structname></title>
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<tgroup cols="2">
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&cs-def;
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<thead>
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<row>
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<entry>ID</entry>
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<entry>Description</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 align="char">pid</entry>
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<entry align="char">Packet ID (PID) of the MPEG-TS that contains
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data</entry>
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</row><row>
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<entry align="char">ifnum</entry>
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<entry align="char">number of the DVB interface.</entry>
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</row><row>
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<entry align="char">feedtype</entry>
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<entry align="char">Encapsulation type of the feed. It can be:
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<constant>DVB_NET_FEEDTYPE_MPE</constant> for MPE encoding
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or
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<constant>DVB_NET_FEEDTYPE_ULE</constant> for ULE encoding.
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</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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</refsect1>
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</refentry>
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<refentry id="NET_REMOVE_IF">
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<refmeta>
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<refentrytitle>ioctl NET_REMOVE_IF</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>NET_REMOVE_IF</refname>
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<refpurpose>Removes a network interface.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>int <parameter>ifnum</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>&fe_fd;</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>FE_SET_TONE</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>net_if</parameter></term>
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<listitem>
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<para>number of the interface to be removed</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>The NET_REMOVE_IF ioctl deletes an interface previously created
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via &NET-ADD-IF;.</para>
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&return-value-dvb;
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</refsect1>
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</refentry>
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<refentry id="NET_GET_IF">
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<refmeta>
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<refentrytitle>ioctl NET_GET_IF</refentrytitle>
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&manvol;
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</refmeta>
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<refnamediv>
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<refname>NET_GET_IF</refname>
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<refpurpose>Read the configuration data of an interface created via
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&NET-ADD-IF;.</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcprototype>
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<funcdef>int <function>ioctl</function></funcdef>
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<paramdef>int <parameter>fd</parameter></paramdef>
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<paramdef>int <parameter>request</parameter></paramdef>
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<paramdef>struct dvb_net_if *<parameter>net_if</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Arguments</title>
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<variablelist>
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<varlistentry>
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<term><parameter>fd</parameter></term>
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<listitem>
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<para>&fe_fd;</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>request</parameter></term>
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<listitem>
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<para>FE_SET_TONE</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>net_if</parameter></term>
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<listitem>
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<para>pointer to &dvb-net-if;</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>The NET_GET_IF ioctl uses the interface number given by the
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&dvb-net-if;::ifnum field and fills the content of &dvb-net-if; with
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the packet ID and encapsulation type used on such interface. If the
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interface was not created yet with &NET-ADD-IF;, it will return -1 and
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fill the <constant>errno</constant> with <constant>EINVAL</constant>
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error code.</para>
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&return-value-dvb;
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</refsect1>
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</refentry>
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</section>
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