mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
[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: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
839aa56d07
commit
315d27aacf
@ -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) \
|
||||
|
||||
@ -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">
|
||||
|
||||
@ -1,156 +1,238 @@
|
||||
<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>
|
||||
<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>
|
||||
|
||||
<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 /⋆ multi protocol encapsulation ⋆/
|
||||
#define DVB_NET_FEEDTYPE_ULE 1 /⋆ ultra lightweight encapsulation ⋆/
|
||||
};
|
||||
</programlisting>
|
||||
</section>
|
||||
<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…
|
||||
</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>
|
||||
&return-value-dvb;
|
||||
</section>
|
||||
|
||||
<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>
|
||||
</entry>
|
||||
</row></tbody></tgroup></informaltable>
|
||||
&return-value-dvb;
|
||||
</section>
|
||||
<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>
|
||||
|
||||
<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>
|
||||
|
||||
<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>
|
||||
</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;
|
||||
</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>
|
||||
|
||||
&return-value-dvb;
|
||||
</refsect1>
|
||||
</refentry>
|
||||
</section>
|
||||
|
||||
@ -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;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user