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<html>
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<head>
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<title>The VDR Plugin System</title>
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</head>
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<body bgcolor="white">
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<h1>The VDR Plugin System</h1>
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VDR provides an easy to use plugin interface that allows additional functionality
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to be added to the program by implementing a dynamically loadable library file.
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This interface allows programmers to develop additional functionality for VDR completely
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separate from the core VDR source, without the need of patching the original
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VDR code (and all the problems of correlating various patches).
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<p>
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This document describes the "outside" interface of the plugin system.
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It handles everything necessary for a plugin to get hooked into the core
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VDR program and present itself to the user.
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<p>
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<!--X1.1.1--><table width=100%><tr><td bgcolor=red> </td><td width=100%>
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Important modifications introduced in version 1.1.1 are marked like this.
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<!--X1.1.1--></td></tr></table>
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<!--<p>TODO: Link to the document about VDR base classes to use when implementing actual functionality (yet to be written).-->
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<hr><h2>Quick start</h2>
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<center><i><b>Can't wait, can't wait!</b></i></center><p>
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Actually you should read this entire document before starting to work with VDR plugins,
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but you probably want to see something happening right away <tt>;-)</tt>
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<p>
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So, for a quick demonstration of the plugin system, there is a sample plugin called
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"hello" that comes with the VDR source. To test drive this one, do the following:
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<ul>
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<li>change into the VDR source directory
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<li><b><tt>make</tt></b> the VDR program with your usual <tt>REMOTE=...</tt> (and maybe other) options
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<li>do <b><tt>make plugins</tt></b> to build the plugin
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<li>run VDR with <b><tt>vdr -V</tt></b> to see the version information
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<li>run VDR with <b><tt>vdr -h</tt></b> to see the command line options
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<li>run VDR with <b><tt>vdr -Phello</tt></b>
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<li>open VDR's main menu and select the <i>Hello</i> item
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<li>open the <i>Setup</i> menu from VDR's main menu and select <i>Plugins</i>
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</ul>
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If you enjoyed this brief glimpse into VDR plugin handling, read through the rest of
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this document and eventually write your own VDR plugin.
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<hr><h2>The name of the plugin</h2>
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<center><i><b>Give me some I.D.!</b></i></center><p>
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One of the first things to consider when writing a VDR plugin is giving the thing
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a proper name. This name will be used in the VDR command line in order to load
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the plugin, and will also be the name of the plugin's source directory, as well
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as part of the final library name.
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<p>
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The plugin's name should typically be as short as possible. Three letter
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abbreviations like <b><tt>dvd</tt></b> (for a DVD player) or <b><tt>mp3</tt></b>
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(for an MP3 player) would be good choices. It is also recommended that the name
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consists of only lowercase letters and digits.
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No other characters should be used here.
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<p>
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A plugin can access its name through the (non virtual) member function
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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const char *Name(void);
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</pre></td></tr></table><p>
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The actual name is derived from the plugin's library file name, as defined in the
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next chapter.
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<a name="The plugin directory structure"><hr><h2>The plugin directory structure</h2>
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<center><i><b>Where is everybody?</b></i></center><p>
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By default plugins are located in a directory named <tt>PLUGINS</tt> below the
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VDR source directory. Inside this directory the following subdirectory structure
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is used:
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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VDR/PLUGINS/src
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VDR/PLUGINS/src/hello
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VDR/PLUGINS/lib
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VDR/PLUGINS/lib/libvdr-hello.so.1.1.0
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</pre></td></tr></table><p>
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The <tt>src</tt> directory contains one subdirectory for each plugin, which carries
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the name of that plugin (in the above example that would be <tt>hello</tt>).
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What's inside the individual source directory of a
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plugin is entirely up to the author of that plugin. The only prerequisites are
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that there is a <tt>Makefile</tt> that provides the targets <tt>all</tt> and
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<tt>clean</tt>, and that a call to <tt>make all</tt> actually produces a dynamically
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loadable library file for that plugin (we'll get to the details later).
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<p>
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The <tt>lib</tt> directory contains the dynamically loadable libraries of all
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available plugins. Note that the names of these files are created by concatenating
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<p>
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<table border=2>
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<tr><td align=center><b><tt>libvdr-</tt></b></td><td align=center><b><tt>hello</tt></b></td><td align=center><b><tt>.so.</tt></b></td><td align=center><b><tt>1.1.0</tt></b></td></tr>
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<tr><td align=center><font size=-1>VDR plugin<br>library prefix</font></td><td align=center><font size=-1>name of<br>the plugin</font></td><td align=center><font size=-1>shared object<br>indicator</font></td><td align=center><font size=-1>VDR version number<br>this plugin was<br>compiled for</font></td></tr>
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</table>
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<p>
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The plugin library files can be stored in any directory. If the default organization
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is not used, the path to the plugin directory has be be given to VDR through the
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<b><tt>-L</tt></b> option.
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<p>
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The VDR <tt>Makefile</tt> contains the target <tt>plugins</tt>, which calls
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<tt>make all</tt> in every directory found under <tt>VDR/PLUGINS/src</tt>,
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plus the target <tt>plugins-clean</tt>, which calls <tt>make clean</tt> in
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each of these directories.
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<p>
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If you download a plugin <a href="#Building the distribution package">package</a>
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from the web, it will typically have a name like
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<p>
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<tt>vdr-hello-0.0.1.tgz</tt>
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<p>
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and will unpack into a directory named
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<p>
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<tt>vdr-hello-0.0.1</tt>
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<p>
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To use the <tt>plugins</tt> and <tt>plugins-clean</tt> targets from the VDR <tt>Makefile</tt>
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you need to unpack such an archive into the <tt>VDR/PLUGINS/src</tt> directory and
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create a symbolic link with the basic plugin name, as in
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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ln -s vdr-hello-0.0.1 hello
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</pre></td></tr></table><p>
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Since the VDR <tt>Makefile</tt> only searches for directories with names consisting
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of only lowercase characters and digits, it will only follow the symbolic links, which
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should lead to the current version of the plugin you want to use. This way you can
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have several different versions of a plugin source (like <tt>vdr-hello-0.0.1</tt> and
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<tt>vdr-hello-0.0.2</tt>) and define which one to actually use through the symbolic link.
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<a name="Initializing a new plugin directory"><hr><h2>Initializing a new plugin directory</h2>
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<center><i><b>A room with a view</b></i></center><p>
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Call the Perl script <tt>newplugin</tt> from the VDR source directory to create
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a new plugin directory with a <tt>Makefile</tt> and a main source file implementing
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the basic derived plugin class.
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You will also find a <tt>README</tt> file there with some inital text, where you
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should fill in actual information about your project.
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A <tt>HISTORY</tt> file is set up with an "Initial revision" entry. As your project
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evolves, you should add the changes here with date and version number.
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<p>
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<tt>newplugin</tt> also creates a copy of the GPL license file <tt>COPYING</tt>,
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assuming that you will release your work under that license. Change this if you
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have other plans.
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<p>
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Add further files and maybe subdirectories to your plugin source directory as
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necessary. Don't forget to adapt the <tt>Makefile</tt> appropriately.
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<hr><h2>The actual implementation</h2>
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<center><i><b>Use the source, Luke!</b></i></center><p>
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A newly initialized plugin doesn't really do very much yet.
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If you <a href="#Loading plugins into VDR">load it into VDR</a> you will find a new
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entry in the main menu, with the same name as your plugin (where the first character
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has been converted to uppercase). There will also be a new entry named "Plugins" in
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the "Setup" menu, which will bring up a list of all loaded plugins, through which you
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can access each plugin's own setup parameters (if it provides any).
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<p>
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To implement actual functionality into your plugin you need to edit the source file
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that was generated as <tt>PLUGINS/src/name.c</tt>. Read the comments in that file
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to see where you can bring in your own code. The following sections of this document
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will walk you through the individual member functions of the plugin class.
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<p>
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Depending on what your plugin shall do, you may or may not need all of the given
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member functions. Except for the <tt>MainMenuEntry()</tt> function they all by default
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return values that will result in no actual functionality. You can either completely
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delete unused functions from your source file, or just leave them as they are.
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If your plugin shall not be accessible through VDR's main menu, simply remove
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(or comment out) the line implementing the <tt>MainMenuEntry()</tt> function.
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<p>
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At the end of the plugin's source file you will find a line that looks like this:
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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VDRPLUGINCREATOR(cPluginHello);
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</pre></td></tr></table><p>
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This is the "magic" hook that allows VDR to actually load the plugin into
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its memory. You don't need to worry about the details behind all this.
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<p>
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If your plugin requires additional source files, simply add them to your plugin's
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source directory and adjust the <tt>Makefile</tt> accordingly.
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<p>
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<!--X1.1.1--><table width=100%><tr><td bgcolor=red> </td><td width=100%>
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Header files usually contain preprocessor statements that prevent the same
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file (or rather its contents, to be precise) from being included more than once, like
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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#ifndef __I18N_H
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#define __I18N_H
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...
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#endif //__I18N_H
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</pre></td></tr></table><p>
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The example shown here is the way VDR does this in its core source files.
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It takes the header file's name, converts it to all uppercase, replaces the
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dot with an underline and preceedes the whole thing with two underlines.
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The GNU library header files do this pretty much the same way, except that they
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usually precede the name with only one underline (there are exceptions, though).
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<p>
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As long as you make shure that none of your plugin's header files will be named
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like one of VDR's header files, you can use the same method as VDR. However,
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if you want to name a header file like one that is already existing in VDR's
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source (<tt>i18n.h</tt> would be a possible candidate for this), you may want
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to make sure that the macros used here don't clash. How you do this is completely
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up to you. You could, for instance, prepend the macro with a <tt>'P'</tt>, as in
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<tt>P__I18N_H</tt>, or leave out the trailing <tt>_H</tt>, as in <tt>__I18N</tt>,
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or use a completely different way to make sure a header file is included only once.
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<p>
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The 'hello' example that comes with VDR makes use of <a href="#Internationalization">internationalization</a>
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and implements a file named <tt>i18n.h</tt>. To make sure it won't clash with VDR's
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<tt>i18n.h</tt> it uses the macro <tt>_I18N__H</tt> (one underline at the beginning
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and two replacing the dot).
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<!--X1.1.1--></td></tr></table>
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<hr><h2>Construction and Destruction</h2>
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<center><i><b>What goes up, must come down...</b></i></center><p>
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The constructor and destructor of a plugin are defined as
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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cPlugin(void);
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virtual ~cPlugin();
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</pre></td></tr></table><p>
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The <b>constructor</b> shall initialize any member variables the plugin defines, but
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<b>must not access any global structures of VDR</b>.
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It also must not create any threads or other large data structures. These things
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are done in the <a href="#Getting started"><tt>Start()</tt></a> function later.
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Constructing a plugin object shall not have any side effects or produce any output,
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since VDR, for instance, has to create the plugin objects in order to get their
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command line help - and after that immediately destroys them again.
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<p>
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The <b>destructor</b> has to clean up any data created by the plugin, and has to
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take care that any threads the plugin may have created will be stopped.
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<p>
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Of course, if your plugin doesn't define any member variables that need to be
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initialized (and deleted), you don't need to implement either of these functions.
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<hr><h2>Version number</h2>
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<center><i><b>Which incarnation is this?</b></i></center><p>
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Every plugin must have a version number of its own, which does not necessarily
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have to be in any way related to the VDR version number.
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VDR requests a plugin's version number through a call to the function
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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virtual const char *Version(void) = 0;
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</pre></td></tr></table><p>
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Since this is a "pure" virtual function, any derived plugin class <b>must</b>
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implement it. The returned string should identify this version of the plugin.
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Typically this would be something like "0.0.1", but it may also contain other
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information, like for instance "0.0.1pre2" or the like. The string should only
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be as long as really necessary, and shall not contain the plugin's name itself.
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Here's an example:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
static const char *VERSION = "0.0.1";
|
|
|
|
|
|
2002-05-11 13:44:58 +02:00
|
|
|
const char *cPluginHello::Version(void)
|
2002-05-09 16:26:56 +02:00
|
|
|
{
|
|
|
|
|
return VERSION;
|
|
|
|
|
}
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
Note that the definition of the version number is expected to be located in the
|
|
|
|
|
main source file, and must be written as
|
|
|
|
|
<pre>
|
|
|
|
|
static const char *VERSION = ...
|
|
|
|
|
</pre>
|
|
|
|
|
just like shown in the above example. This is a convention that allows the <tt>Makefile</tt>
|
|
|
|
|
to extract the version number when generating the file name for the distribution archive.
|
|
|
|
|
<p>
|
|
|
|
|
A new plugin project should start with version number <tt>0.0.1</tt> and should reach
|
|
|
|
|
version <tt>1.0.0</tt> once it is completely operative and well tested. Following the
|
|
|
|
|
Linux kernel version numbering scheme, versions with <i>even</i> release numbers
|
|
|
|
|
(like <tt>1.0.x</tt>, <tt>1.2.x</tt>, <tt>1.4.x</tt>...) should be stable releases,
|
|
|
|
|
while those with <i>odd</i> release numbers (like <tt>1.1.x</tt>, <tt>1.3.x</tt>,
|
|
|
|
|
<tt>1.5.x</tt>...) are usually considered "under development". The three parts of
|
|
|
|
|
a version number are not limited to single digits, so a version number of <tt>1.2.15</tt>
|
|
|
|
|
would be acceptable.
|
|
|
|
|
|
|
|
|
|
<hr><h2>Description</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>What is it that you do?</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
In order to tell the user what exactly a plugin does, it must implement the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual const char *Description(void) = 0;
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
2002-05-11 13:44:58 +02:00
|
|
|
which returns a short, one line description of the plugin's purpose:
|
2002-05-09 16:26:56 +02:00
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
static const char *DESCRIPTION = "A friendly greeting";
|
|
|
|
|
|
2002-05-09 16:26:56 +02:00
|
|
|
virtual const char *Description(void)
|
|
|
|
|
{
|
2002-05-11 13:44:58 +02:00
|
|
|
return tr(DESCRIPTION);
|
2002-05-09 16:26:56 +02:00
|
|
|
}
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
2002-05-11 13:44:58 +02:00
|
|
|
Note the <tt>tr()</tt> around the <tt>DESCRIPTION</tt>, which allows the description
|
|
|
|
|
to be <a href="#Internationalization">internationalized</a>.
|
|
|
|
|
|
2002-05-09 16:26:56 +02:00
|
|
|
<hr><h2>Command line arguments</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Taking orders</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
A VDR plugin can have command line arguments just like any normal program.
|
|
|
|
|
If a plugin wants to react on command line arguments, it needs to implement
|
|
|
|
|
the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual bool ProcessArgs(int argc, char *argv[]);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
The parameters <tt>argc</tt> and <tt>argv</tt> have exactly the same meaning
|
|
|
|
|
as in a normal C program's <tt>main()</tt> function.
|
|
|
|
|
<tt>argv[0]</tt> contains the name of the plugin (as given in the <b><tt>-P</tt></b>
|
|
|
|
|
option of the <tt>vdr</tt> call).
|
|
|
|
|
<p>
|
|
|
|
|
Each plugin has its own set of command line options, which are totally independent
|
|
|
|
|
from those of any other plugin or VDR itself.
|
|
|
|
|
<p>
|
|
|
|
|
You can use the <tt>getopt()</tt> or <tt>getopt_long()</tt> function to process
|
|
|
|
|
these arguments. As with any normal C program, the strings pointed to by <tt>argv</tt>
|
|
|
|
|
will survive the entire lifetime of the plugin, so it is safe to store pointers to
|
|
|
|
|
these values inside the plugin. Here's an example:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
bool cPluginHello::ProcessArgs(int argc, char *argv[])
|
|
|
|
|
{
|
|
|
|
|
// Implement command line argument processing here if applicable.
|
2002-05-09 16:26:56 +02:00
|
|
|
static struct option long_options[] = {
|
2002-05-11 13:44:58 +02:00
|
|
|
{ "aaa", required_argument, NULL, 'a' },
|
|
|
|
|
{ "bbb", no_argument, NULL, 'b' },
|
|
|
|
|
{ NULL }
|
|
|
|
|
};
|
|
|
|
|
|
2002-05-09 16:26:56 +02:00
|
|
|
int c;
|
|
|
|
|
while ((c = getopt_long(argc, argv, "a:b", long_options, NULL)) != -1) {
|
|
|
|
|
switch (c) {
|
2002-05-11 13:44:58 +02:00
|
|
|
case 'a': option_a = optarg;
|
2002-05-09 16:26:56 +02:00
|
|
|
break;
|
2002-05-11 13:44:58 +02:00
|
|
|
case 'b': option_b = true;
|
2002-05-09 16:26:56 +02:00
|
|
|
break;
|
|
|
|
|
default: return false;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
The return value must be <i>true</i> if all options have been processed
|
|
|
|
|
correctly, or <i>false</i> in case of an error. The first plugin that returns
|
|
|
|
|
<i>false</i> from a call to its <tt>ProcessArgs()</tt> function will cause VDR
|
|
|
|
|
to exit.
|
|
|
|
|
|
|
|
|
|
<hr><h2>Command line help</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Tell me about it...</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
If a plugin accepts command line options, it should implement the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual const char *CommandLineHelp(void);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
which will be called if the user enters the <b><tt>-h</tt></b> option when starting VDR.
|
|
|
|
|
The returned string should contain the command line help for this plugin, formatted
|
|
|
|
|
in the same way as done by VDR itself:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
const char *cPluginHello::CommandLineHelp(void)
|
2002-05-09 16:26:56 +02:00
|
|
|
{
|
2002-05-11 13:44:58 +02:00
|
|
|
// Return a string that describes all known command line options.
|
2002-05-09 16:26:56 +02:00
|
|
|
return " -a ABC, --aaa=ABC do something nice with ABC\n"
|
|
|
|
|
" -b, --bbb activate 'plan B'\n";
|
|
|
|
|
}
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
This command line help will be printed directly below VDR's help texts (separated
|
|
|
|
|
by a line indicating the plugin's name, version and description), so if you use the
|
|
|
|
|
same formatting as shown here it will line up nicely.
|
|
|
|
|
Note that all lines should be terminated with a newline character, and should
|
|
|
|
|
be shorter than 80 characters.
|
|
|
|
|
|
|
|
|
|
<a name="Getting started"><hr><h2>Getting started</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Let's get ready to rumble!</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
If a plugin implements a function that runs in the background (presumably in a
|
|
|
|
|
thread of its own), or wants to make use of <a href="#Internationalization">internationalization</a>,
|
|
|
|
|
it needs to implement the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual void Start(void);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
which is called once for each plugin at program startup.
|
|
|
|
|
Inside this function the plugin must set up everything necessary to perform
|
|
|
|
|
its task. This may, for instance, be a thread that collects data from the DVB
|
|
|
|
|
stream, which is later presented to the user via a function that is available
|
|
|
|
|
from the main menu.
|
|
|
|
|
<p>
|
|
|
|
|
If the plugin doesn't implement any background functionality or internationalized
|
|
|
|
|
texts, it doesn't need to implement this function.
|
|
|
|
|
|
|
|
|
|
<hr><h2>Main menu entry</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Today's special is...</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
If the plugin implements a feature that the user shall be able to access
|
|
|
|
|
from VDR's main menu, it needs to implement the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual const char *MainMenuEntry(void);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
The default implementation returns a <tt>NULL</tt> pointer, which means that
|
|
|
|
|
this plugin will not have an item in the main menu. Here's an example of a
|
|
|
|
|
plugin that will have a main menu item:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
static const char *MAINMENUENTRY = "Hello";
|
|
|
|
|
|
|
|
|
|
const char *cPluginHello::MainMenuEntry(void)
|
2002-05-09 16:26:56 +02:00
|
|
|
{
|
2002-05-11 13:44:58 +02:00
|
|
|
return tr(MAINMENUENTRY);
|
2002-05-09 16:26:56 +02:00
|
|
|
}
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
The menu entries of all plugins will be inserted into VDR's main menu right
|
|
|
|
|
after the <i>Recordings</i> item, in the same sequence as they were given
|
|
|
|
|
in the call to VDR.
|
|
|
|
|
|
|
|
|
|
<hr><h2>User interaction</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>It's showtime!</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
If the user selects the main menu entry of a plugin, VDR calls the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual cOsdMenu *MainMenuAction(void);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
which can do one of two things:
|
|
|
|
|
<ul>
|
|
|
|
|
<li>Return a pointer to a <tt>cOsdMenu</tt> object which will be displayed
|
|
|
|
|
as a submenu of the main menu (just like the <i>Recordings</i> menu, for instance).
|
|
|
|
|
That menu can then implement further functionality and, for instance, could
|
|
|
|
|
eventually start a custom player to replay a file other than a VDR recording.
|
|
|
|
|
<li>Perform a specific action and return <tt>NULL</tt>. In that case the main menu
|
|
|
|
|
will be closed after calling <tt>MainMenuAction()</tt>.
|
|
|
|
|
</ul>
|
|
|
|
|
<b>
|
|
|
|
|
It is very important that a call to <tt>MainMenuAction()</tt> returns as soon
|
|
|
|
|
as possible! As long as the program stays inside this function, no other user
|
|
|
|
|
interaction is possible. If a specific action takes longer than a few seconds,
|
|
|
|
|
the plugin should launch a separate thread to do this.
|
|
|
|
|
</b>
|
|
|
|
|
|
|
|
|
|
<hr><h2>Setup parameters</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Remember me...</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
If a plugin requires its own setup parameters, it needs to implement the following
|
|
|
|
|
functions to handle these parameters:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
virtual cMenuSetupPage *SetupMenu(void);
|
|
|
|
|
virtual bool SetupParse(const char *Name, const char *Value);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
2002-05-11 13:44:58 +02:00
|
|
|
The <tt>SetupMenu()</tt> function shall return the plugin's <a href="#The Setup menu"><i>Setup</i> menu</a>
|
2002-05-09 16:26:56 +02:00
|
|
|
page, where the user can adjust all the parameters known to this plugin.
|
|
|
|
|
<p>
|
|
|
|
|
<tt>SetupParse()</tt> will be called for each parameter the plugin has
|
|
|
|
|
previously stored in the global setup data (see below). It shall return
|
|
|
|
|
<i>true</i> if the parameter was parsed correctly, <i>false</i> in case of
|
|
|
|
|
an error. If <i>false</i> is returned, an error message will be written to
|
|
|
|
|
the log file (and program execution will continue).
|
2002-05-11 13:44:58 +02:00
|
|
|
<!--X1.1.1--><table width=100%><tr><td bgcolor=red> </td><td width=100%>
|
|
|
|
|
A possible implementation of <tt>SetupParse()</tt> could look like this:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
bool cPluginHello::SetupParse(const char *Name, const char *Value)
|
|
|
|
|
{
|
|
|
|
|
// Parse your own setup parameters and store their values.
|
|
|
|
|
if (!strcasecmp(Name, "GreetingTime")) GreetingTime = atoi(Value);
|
|
|
|
|
else if (!strcasecmp(Name, "UseAlternateGreeting")) UseAlternateGreeting = atoi(Value);
|
|
|
|
|
else
|
|
|
|
|
return false;
|
|
|
|
|
return true;
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
It is important to make sure that the parameter names are exactly the same as
|
|
|
|
|
used in the <a href="#The Setup menu"><i>Setup</i> menu</a>'s <tt>Store()</tt> function.
|
|
|
|
|
<!--X1.1.1--></td></tr></table>
|
2002-05-09 16:26:56 +02:00
|
|
|
<p>
|
|
|
|
|
The plugin's setup parameters are stored in the same file as VDR's parameters.
|
|
|
|
|
In order to allow each plugin (and VDR itself) to have its own set of parameters,
|
|
|
|
|
the <tt>Name</tt> of each parameter will be preceeded with the plugin's
|
|
|
|
|
name, as in
|
|
|
|
|
<p>
|
2002-05-11 13:44:58 +02:00
|
|
|
<tt>hello.GreetingTime = 3</tt>
|
2002-05-09 16:26:56 +02:00
|
|
|
<p>
|
|
|
|
|
The prefix will be handled by the core VDR setup code, so the individual
|
|
|
|
|
plugins need not worry about this.
|
|
|
|
|
<p>
|
|
|
|
|
To store its values in the global setup, a plugin has to call the function
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
|
|
|
|
void SetupStore(const char *Name, <i>type</i> Value);
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
2002-05-11 13:44:58 +02:00
|
|
|
where <tt>Name</tt> is the name of the parameter (<tt>"GreetingTime"</tt> in the above
|
|
|
|
|
example, without the prefix <tt>"hello."</tt>) and <tt>Value</tt> is a simple data type (like
|
2002-05-09 16:26:56 +02:00
|
|
|
<tt>char *</tt>, <tt>int</tt> etc).
|
|
|
|
|
Note that this is not a function that the individual plugin class needs to implement!
|
|
|
|
|
<tt>SetupStore()</tt> is a non-virtual member function of the <tt>cPlugin</tt> class.
|
|
|
|
|
<p>
|
|
|
|
|
To remove a parameter from the setup data, call <tt>SetupStore()</tt> with the appropriate
|
|
|
|
|
name and without any value, as in
|
|
|
|
|
<p>
|
2002-05-11 13:44:58 +02:00
|
|
|
<tt>SetupStore("GreetingTime");</tt>
|
2002-05-09 16:26:56 +02:00
|
|
|
<p>
|
|
|
|
|
The VDR menu "Setup/Plugins" will list all loaded plugins with their name,
|
|
|
|
|
version number and description. Selecting an item in this list will bring up
|
|
|
|
|
the plugin's "Setup" menu if that plugin has implemented the <tt>SetupMenu()</tt>
|
|
|
|
|
function.
|
|
|
|
|
<p>
|
|
|
|
|
Finally, a plugin doesn't have to implement the <tt>SetupMenu()</tt> if it only
|
|
|
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needs setup parameters that are not directly user adjustable. It can use
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<tt>SetupStore()</tt> and <tt>SetupParse()</tt> without presenting these
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parameters to the user.
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2002-05-11 13:44:58 +02:00
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<!--X1.1.1--><table width=100%><tr><td bgcolor=red> </td><td width=100%>
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<a name="The Setup menu"><hr><h2>The Setup menu</h2>
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<center><i><b>Have it your way!</b></i></center><p>
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To implement a <i>Setup</i> menu, a plugin needs to derive a class from
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<tt>cMenuSetupPage</tt> and implement its constructor and the pure virtual
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<tt>Store()</tt> member function:
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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int GreetingTime = 3;
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int UseAlternateGreeting = false;
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class cMenuSetupHello : public cMenuSetupPage {
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private:
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int newGreetingTime;
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int newUseAlternateGreeting;
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protected:
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virtual void Store(void);
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public:
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cMenuSetupHello(void);
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};
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cMenuSetupHello::cMenuSetupHello(void)
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{
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newGreetingTime = GreetingTime;
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newUseAlternateGreeting = UseAlternateGreeting;
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Add(new cMenuEditIntItem( tr("Greeting time (s)"), &newGreetingTime));
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Add(new cMenuEditBoolItem(tr("Use alternate greeting"), &newUseAlternateGreeting));
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}
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void cMenuSetupHello::Store(void)
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{
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SetupStore("GreetingTime", GreetingTime = newGreetingTime);
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SetupStore("UseAlternateGreeting", UseAlternateGreeting = newUseAlternateGreeting);
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}
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</pre></td></tr></table><p>
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In this example we have two global setup parameters (<tt>GreetingTime</tt> and <tt>UseAlternateGreeting</tt>).
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The constructor initializes two private members with the values of these parameters, so
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that the <i>Setup</i> menu can work with temporary copies (in order to discard any changes
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if the user doesn't confirm them by pressing the "Ok" button).
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After this the constructor adds the appropriate menu items, using internationalized texts
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and the addresses of the temporary variables. That's all there is to inizialize a <i>Setup</i>
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menu - the rest will be done by the core VDR code.
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<p>
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Once the user has pressed the "Ok" button to confirm the changes, the <tt>Store()</tt> function will
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be called, in which all setup parameters must be actually stored in VDR's global setup data.
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This is done by calling the <tt>SetupStore()</tt> function for each of the parameters.
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The <i>Name</i> string given here will be used to identify the parameter in VDR's
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<tt>setup.conf</tt> file, and will be automatically prepended with the plugin's name.
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<p>
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Note that in this small example the new values of the parameters are copied into the
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global variables within each <tt>SetupStore()</tt> call. This is not mandatory, however.
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You can first assign the temporary values to the global variables and then do the
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<tt>SetupStore()</tt> calls, or you can define a class or struct that contains all
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your setup parameters and use that one to copy all parameters with one single statement
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(like VDR does with its cSetup class).
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<!--X1.1.1--></td></tr></table>
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2002-05-09 16:26:56 +02:00
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<a name="Internationalization"><hr><h2>Internationalization</h2>
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<center><i><b>Welcome to Babylon!</b></i></center><p>
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If a plugin displays texts to the user, it should implement internationalized
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versions of these texts and call the function
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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void RegisterI18n(const tI18nPhrase * const Phrases);
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</pre></td></tr></table><p>
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to register them with VDR's internationalization mechanism.
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<p>
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The call to this function must be done in the <a href="#Getting started"><tt>Start()</tt></a> function of the plugin:
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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const tI18nPhrase Phrases[] = {
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{ "Hello world!",
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"Hallo Welt!",
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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"",// TODO
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},
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{ NULL }
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};
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|
|
2002-05-11 13:44:58 +02:00
|
|
|
void cPluginHello::Start(void)
|
2002-05-09 16:26:56 +02:00
|
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|
{
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RegisterI18n(Phrases);
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}
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|
</pre></td></tr></table><p>
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Each entry of type <tt>tI18nPhrase</tt> must have exactly as many members as defined
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by the constant <tt>I18nNumLanguages</tt> in the file <tt>VDR/i18n.h</tt>, and the
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|
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sequence of the various languages must be the same as defined in <tt>VDR/i18n.c</tt>.<br>
|
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|
<b>It is very important that the array is terminated with a <tt>{ NULL }</tt>
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entry!</b>.
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|
<p>
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Usually you won't be able to fill in all the different translations by yourself, so
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you may want to contact the maintainers of these languages (listed in the file
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<tt>VDR/i18n.c</tt>) and ask them to provide the additional translations.
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|
|
<p>
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|
|
The actual runtime selection of the texts corresponding to the selected language
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is done by wrapping each internationalized text with the <tt>tr()</tt> macro:
|
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|
|
|
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|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
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|
|
|
const char *s = tr("Hello world!");
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|
|
|
</pre></td></tr></table><p>
|
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|
|
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The text given here must be the first one defined in the related <i>Phrases</i>
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|
|
entry (which is the English version), and the returned pointer is either a translated
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|
|
version (if available) or the original string. In the latter case a message will be
|
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|
|
|
written to the log file, indicating that a translation is missing.
|
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|
|
|
Texts are first searched for in the <i>Phrases</i> registered for this plugin (if any)
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|
|
|
and then in the global VDR texts. So a plugin can make use of texts defined by the
|
|
|
|
|
core VDR code.
|
|
|
|
|
|
|
|
|
|
<a name="Loading plugins into VDR"><hr><h2>Loading plugins into VDR</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Saddling up!</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
Plugins are loaded into VDR using the command line option <b><tt>-P</tt></b>, as in
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
vdr -Phello
|
2002-05-09 16:26:56 +02:00
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
If the plugin accepts command line options, they are given as part of the argument
|
|
|
|
|
to the <b><tt>-P</tt></b> option, which then has to be enclosed in quotes:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
vdr -P"hello -a abc -b"
|
2002-05-09 16:26:56 +02:00
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
Any number of plugins can be loaded this way, each with its own <b><tt>-P</tt></b> option:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
vdr -P"hello -a abc -b" -Pdvd -Pmp3
|
2002-05-09 16:26:56 +02:00
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
If you are not starting VDR from the VDR source directory (and thus your plugins
|
|
|
|
|
cannot be found at their default location) you need to tell VDR the location of
|
|
|
|
|
the plugins through the <b><tt>-L</tt></b> option:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
vdr -L/usr/lib/vdr -Phello
|
2002-05-09 16:26:56 +02:00
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
There can be any number of <b><tt>-L</tt></b> options, and each of them will apply to the
|
|
|
|
|
<b><tt>-P</tt></b> options following it.
|
|
|
|
|
<p>
|
|
|
|
|
When started with the <b><tt>-h</tt></b> or <b><tt>-V</tt></b> option (for <i>help</i>
|
|
|
|
|
or <i>version</i> information, respectively), VDR will automatically load all plugins
|
|
|
|
|
in the default or given directory that match the VDR plugin
|
|
|
|
|
<a href="#The plugin directory structure">naming convention</a>,
|
|
|
|
|
and display their help and/or version information in addition to its own output.
|
|
|
|
|
|
|
|
|
|
<a name="Building the distribution package"><hr><h2>Building the distribution package</h2>
|
|
|
|
|
|
|
|
|
|
<center><i><b>Let's get this show on the road!</b></i></center><p>
|
|
|
|
|
|
|
|
|
|
If you want to make your plugin available to other VDR users, you'll need to
|
|
|
|
|
make a package that can be easily distributed.
|
|
|
|
|
The <tt>Makefile</tt> that has been created by the call to
|
|
|
|
|
<a href="#Initializing a new plugin directory"><tt>newplugin</tt></a>
|
|
|
|
|
provides the target <tt>package</tt>, which does this for you.
|
|
|
|
|
<p>
|
|
|
|
|
Simply change into your source directory and execute <tt>make package</tt>:
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
cd VDR/PLUGINS/src/hello
|
2002-05-09 16:26:56 +02:00
|
|
|
make package
|
|
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
|
|
|
|
After this you should find a file named like
|
|
|
|
|
|
|
|
|
|
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
|
2002-05-11 13:44:58 +02:00
|
|
|
vdr-hello-0.0.1.tgz
|
2002-05-09 16:26:56 +02:00
|
|
|
</pre></td></tr></table><p>
|
|
|
|
|
|
2002-05-11 13:44:58 +02:00
|
|
|
in your source directory, where <tt>hello</tt> will be replaced with your actual
|
2002-05-09 16:26:56 +02:00
|
|
|
plugin's name, and <tt>0.0.1</tt> will be your plugin's current version number.
|
|
|
|
|
|
|
|
|
|
</body>
|
|
|
|
|
</html>
|
