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Commit 315d27aa authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

[media] DocBook: document DVB net API 



The DVB network API was not documented. There are just some
placeholders there.

Replace it by a proper documentation.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 839aa56d

Documentation/DocBook/media/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -91,7 +91,7 @@ STRUCTS = \ 
	$(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/ca.h) \

	$(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/dmx.h) \

	$(shell perl -ne 'print "$$1 " if (!/dtv\_cmds\_h/ && /^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/frontend.h) \

	$(shell perl -ne 'print "$$1 " if (/^struct\s+([A-Z][^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/net.h) \

	$(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/ && !/_old/)' $(srctree)/include/uapi/linux/dvb/net.h) \

	$(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/video.h) \

	$(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/media.h) \

	$(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-subdev.h) \

Documentation/DocBook/media/dvb/dvbapi.xml

+1 −1
Original line number Diff line number Diff line
@@ -108,7 +108,7 @@ Added ISDB-T test originally written by Patrick Boettcher 
  <chapter id="dvb_ca">

    &sub-ca;

  </chapter>

  <chapter id="dvb_net">

  <chapter id="net">

    &sub-net;

  </chapter>

  <chapter id="legacy_dvb_apis">

Documentation/DocBook/media/dvb/net.xml

+228 −146
Original line number Diff line number Diff line 
<title>DVB Network API</title>

<para>The DVB net device enables feeding of MPE (multi protocol encapsulation) packets

received via DVB into the Linux network protocol stack, e.g. for internet via satellite

applications. It can be accessed through <emphasis role="bold">/dev/dvb/adapter0/net0</emphasis>. Data types and

and ioctl definitions can be accessed by including <emphasis role="bold">linux/dvb/net.h</emphasis> in your

application.

</para>

<section id="dvb_net_types">

<title>DVB Net Data Types</title>



<section id="dvb-net-if">

<title>struct dvb_net_if</title>

<programlisting>

struct dvb_net_if {

	__u16 pid;

	__u16 if_num;

	__u8  feedtype;

#define DVB_NET_FEEDTYPE_MPE 0	/&#x22C6; multi protocol encapsulation &#x22C6;/

#define DVB_NET_FEEDTYPE_ULE 1	/&#x22C6; ultra lightweight encapsulation &#x22C6;/

};

</programlisting>

</section>

<para>The DVB net device controls the mapping of data packages that are

    part of a transport stream to be mapped into a virtual network interface,

    visible through the standard Linux network protocol stack.</para>

<para>Currently, two encapsulations are supported:</para>

<itemizedlist>

    <listitem><para><ulink url="http://en.wikipedia.org/wiki/Multiprotocol_Encapsulation">

	Multi Protocol Encapsulation (MPE)</ulink></para></listitem>

    <listitem><para><ulink url="http://en.wikipedia.org/wiki/Unidirectional_Lightweight_Encapsulation">

	Ultra Lightweight Encapsulation (ULE)</ulink></para></listitem>

</itemizedlist>



<para>In order to create the Linux virtual network interfaces, an application

    needs to tell to the Kernel what are the PIDs and the encapsulation types

    that are present on the transport stream. This is done through

    <emphasis role="bold">/dev/dvb/adapter?/net?</emphasis> device node.

    The data will be available via virtual <constant>dvb?_?</constant>

    network interfaces, and will be controled/routed via the standard

    ip tools (like ip, route, netstat, ifconfig, etc).</para>

<para> Data types and and ioctl definitions are defined via

    <emphasis role="bold">linux/dvb/net.h</emphasis> header.</para>



</section>

<section id="net_fcalls">

<title>DVB net Function Calls</title>

<para>To be written&#x2026;

</para>



<section id="NET_ADD_IF"

role="subsection"><title>NET_ADD_IF</title>

<para>DESCRIPTION

</para>

<informaltable><tgroup cols="1"><tbody><row><entry

 align="char">

<para>This ioctl is undocumented. Documentation is welcome.</para>

</entry>

 </row></tbody></tgroup></informaltable>

<para>SYNOPSIS

</para>

<informaltable><tgroup cols="1"><tbody><row><entry

 align="char">

<para>int ioctl(fd, int request = NET_ADD_IF,

 struct dvb_net_if *if);</para>

</entry>

 </row></tbody></tgroup></informaltable>

<para>PARAMETERS

</para>

<informaltable><tgroup cols="2"><tbody><row><entry

 align="char">

<para>int fd</para>

</entry><entry

 align="char">

<para>File descriptor returned by a previous call to open().</para>

</entry>

 </row><row><entry

 align="char">

<para>int request</para>

</entry><entry

 align="char">

<para>Equals NET_ADD_IF for this command.</para>

</entry>

 </row><row><entry

 align="char">

<para>struct dvb_net_if *if

</para>

</entry><entry

 align="char">

<para>Undocumented.</para>

</entry>

 </row></tbody></tgroup></informaltable>





<refentry id="NET_ADD_IF">

  <refmeta>

    <refentrytitle>ioctl NET_ADD_IF</refentrytitle>

    &manvol;

  </refmeta>



  <refnamediv>

    <refname>NET_ADD_IF</refname>

    <refpurpose>Creates a new network interface for a given Packet ID.</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 dvb_net_if *<parameter>net_if</parameter></paramdef>

      </funcprototype>

    </funcsynopsis>

  </refsynopsisdiv>



  <refsect1>

    <title>Arguments</title>

        <variablelist>

      <varlistentry>

	<term><parameter>fd</parameter></term>

	<listitem>

	  <para>&fe_fd;</para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><parameter>request</parameter></term>

	<listitem>

	  <para>FE_SET_TONE</para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><parameter>net_if</parameter></term>

	<listitem>

	  <para>pointer to &dvb-net-if;</para>

	</listitem>

      </varlistentry>

    </variablelist>

  </refsect1>



  <refsect1>

    <title>Description</title>



<para>The NET_ADD_IF ioctl system call selects the Packet ID (PID) that

    contains a TCP/IP traffic, the type of encapsulation to be used (MPE or ULE)

    and the interface number for the new interface to be created. When the

    system call successfully returns, a new virtual network interface is  created.</para>

<para>The &dvb-net-if;::ifnum field will be filled with the number of the

    created interface.</para>



&return-value-dvb;

</section>

</refsect1>



<section id="NET_REMOVE_IF"

role="subsection"><title>NET_REMOVE_IF</title>

<para>DESCRIPTION

</para>

<informaltable><tgroup cols="1"><tbody><row><entry

 align="char">

<para>This ioctl is undocumented. Documentation is welcome.</para>

</entry>

 </row></tbody></tgroup></informaltable>

<para>SYNOPSIS

</para>

<informaltable><tgroup cols="1"><tbody><row><entry

 align="char">

<para>int ioctl(fd, int request = NET_REMOVE_IF);

</para>

</entry>

 </row></tbody></tgroup></informaltable>

<para>PARAMETERS

</para>

<informaltable><tgroup cols="2"><tbody><row><entry

 align="char">

<para>int fd</para>

</entry><entry

 align="char">

<para>File descriptor returned by a previous call to open().</para>

</entry>

 </row><row><entry

 align="char">

<para>int request</para>

</entry><entry

 align="char">

<para>Equals NET_REMOVE_IF for this command.</para>

<refsect1 id="dvb-net-if-t">

<title>struct <structname>dvb_net_if</structname> description</title>



<table pgwide="1" frame="none" id="dvb-net-if">

    <title>struct <structname>dvb_net_if</structname></title>

    <tgroup cols="2">

	&cs-def;

	<thead>

	<row>

	    <entry>ID</entry>

	    <entry>Description</entry>

	</row>

	</thead>

	<tbody valign="top">

	<row>

	    <entry align="char">pid</entry>

	    <entry align="char">Packet ID (PID) of the MPEG-TS that contains

		data</entry>

	</row><row>

	    <entry align="char">ifnum</entry>

	    <entry align="char">number of the DVB interface.</entry>

	</row><row>

	    <entry align="char">feedtype</entry>

	    <entry align="char">Encapsulation type of the feed. It can be:

		<constant>DVB_NET_FEEDTYPE_MPE</constant> for MPE encoding

		or

		<constant>DVB_NET_FEEDTYPE_ULE</constant> for ULE encoding.

		</entry>

 </row></tbody></tgroup></informaltable>

	</row>

        </tbody>

    </tgroup>

</table>

</refsect1>

</refentry>



<refentry id="NET_REMOVE_IF">

  <refmeta>

    <refentrytitle>ioctl NET_REMOVE_IF</refentrytitle>

    &manvol;

  </refmeta>



  <refnamediv>

    <refname>NET_REMOVE_IF</refname>

    <refpurpose>Removes a network interface.</refpurpose>

  </refnamediv>



  <refsynopsisdiv>

    <funcsynopsis>

      <funcprototype>

	<funcdef>int <function>ioctl</function></funcdef>

	<paramdef>int <parameter>fd</parameter></paramdef>

	<paramdef>int <parameter>request</parameter></paramdef>

	<paramdef>int <parameter>ifnum</parameter></paramdef>

      </funcprototype>

    </funcsynopsis>

  </refsynopsisdiv>



  <refsect1>

    <title>Arguments</title>

        <variablelist>

      <varlistentry>

	<term><parameter>fd</parameter></term>

	<listitem>

	  <para>&fe_fd;</para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><parameter>request</parameter></term>

	<listitem>

	  <para>FE_SET_TONE</para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><parameter>net_if</parameter></term>

	<listitem>

	  <para>number of the interface to be removed</para>

	</listitem>

      </varlistentry>

    </variablelist>

  </refsect1>



  <refsect1>

    <title>Description</title>



<para>The NET_REMOVE_IF ioctl deletes an interface previously created

    via &NET-ADD-IF;.</para>



&return-value-dvb;

</section>

</refsect1>

</refentry>





<refentry id="NET_GET_IF">

  <refmeta>

    <refentrytitle>ioctl NET_GET_IF</refentrytitle>

    &manvol;

  </refmeta>



  <refnamediv>

    <refname>NET_GET_IF</refname>

    <refpurpose>Read the configuration data of an interface created via

	&NET-ADD-IF;.</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 dvb_net_if *<parameter>net_if</parameter></paramdef>

      </funcprototype>

    </funcsynopsis>

  </refsynopsisdiv>



  <refsect1>

    <title>Arguments</title>

        <variablelist>

      <varlistentry>

	<term><parameter>fd</parameter></term>

	<listitem>

	  <para>&fe_fd;</para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><parameter>request</parameter></term>

	<listitem>

	  <para>FE_SET_TONE</para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><parameter>net_if</parameter></term>

	<listitem>

	  <para>pointer to &dvb-net-if;</para>

	</listitem>

      </varlistentry>

    </variablelist>

  </refsect1>



  <refsect1>

    <title>Description</title>



<para>The NET_GET_IF ioctl uses the interface number given by the

    &dvb-net-if;::ifnum field and fills the content of &dvb-net-if; with

    the packet ID and encapsulation type used on such interface. If the

    interface was not created yet with &NET-ADD-IF;, it will return -1 and

    fill the <constant>errno</constant> with <constant>EINVAL</constant>

    error code.</para>



<section id="NET_GET_IF"

role="subsection"><title>NET_GET_IF</title>

<para>DESCRIPTION

</para>

<informaltable><tgroup cols="1"><tbody><row><entry

 align="char">

<para>This ioctl is undocumented. Documentation is welcome.</para>

</entry>

 </row></tbody></tgroup></informaltable>

<para>SYNOPSIS

</para>

<informaltable><tgroup cols="1"><tbody><row><entry

 align="char">

<para>int ioctl(fd, int request = NET_GET_IF,

 struct dvb_net_if *if);</para>

</entry>

 </row></tbody></tgroup></informaltable>

<para>PARAMETERS

</para>

<informaltable><tgroup cols="2"><tbody><row><entry

 align="char">

<para>int fd</para>

</entry><entry

 align="char">

<para>File descriptor returned by a previous call to open().</para>

</entry>

 </row><row><entry

 align="char">

<para>int request</para>

</entry><entry

 align="char">

<para>Equals NET_GET_IF for this command.</para>

</entry>

 </row><row><entry

 align="char">

<para>struct dvb_net_if *if

</para>

</entry><entry

 align="char">

<para>Undocumented.</para>

</entry>

 </row></tbody></tgroup></informaltable>

&return-value-dvb;

</section>

</refsect1>

</refentry>

</section>

Documentation/DocBook/media_api.tmpl

+15 −5
Original line number Diff line number Diff line
@@ -95,12 +95,22 @@ 
	<para>For discussing improvements, reporting troubles, sending new drivers, etc, please mail to: <ulink url="http://vger.kernel.org/vger-lists.html#linux-media">Linux Media Mailing List (LMML).</ulink>.</para>

</preface>



<part id="v4l2spec">&sub-v4l2;</part>

<part id="dvbapi">&sub-dvbapi;</part>

<part id="remotes">&sub-remote_controllers;</part>

<part id="media_common">&sub-media-controller;</part>

<part id="v4l2spec">

&sub-v4l2;

</part>

<part id="dvbapi">

&sub-dvbapi;

</part>

<part id="remotes">

&sub-remote_controllers;

</part>

<part id="media_common">

&sub-media-controller;

</part>



<chapter id="gen_errors">&sub-gen-errors;</chapter>

<chapter id="gen_errors">

&sub-gen-errors;

</chapter>



&sub-fdl-appendix;