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Introduced cPlugin::Initialize()

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This commit is contained in:
Klaus Schmidinger
2003-05-09 15:27:46 +02:00
parent aaeaf4582d
commit dc8fd12f91
10 changed files with 111 additions and 43 deletions
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PLUGINS.html
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@@ -21,18 +21,18 @@ VDR program and present itself to the user.
The <i>internal</i> interface provides the plugin code access to VDR's internal data
structures and allows it to hook itself into specific areas to perform special actions.
<p>
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Important modifications introduced in version 1.1.15 are marked like this.
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<hr>
<h1>Table Of Contents</h1>
@@ -283,7 +283,12 @@ virtual ~cPlugin();
The <b>constructor</b> shall initialize any member variables the plugin defines, but
<b>must not access any global structures of VDR</b>.
It also must not create any threads or other large data structures. These things
are done in the <a href="#Getting started"><tt>Start()</tt></a> function later.
are done in the
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<a href="#Getting started"><tt>Initialize()</tt></a> or
<a href="#Getting started"><tt>Start()</tt></a>
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function later.
Constructing a plugin object shall not have any side effects or produce any output,
since VDR, for instance, has to create the plugin objects in order to get their
command line help - and after that immediately destroys them again.
@@ -452,13 +457,28 @@ be shorter than 80 characters.
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
it needs to implement one of the functions
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
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virtual bool Initialize(void);
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virtual bool Start(void);
</pre></td></tr></table><p>
which is called once for each plugin at program startup.
which are called once for each plugin at program startup.
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The difference between these two functions is that <tt>Initialize()</tt> is
called early at program startup, while <tt>Start()</tt> is called after everything
else has been set up, right before the main program loop is entered. Inside the
<tt>Start()</tt> function of any plugin it is guaranteed that the <tt>Initialize()</tt>
functions of all plugins have already been called. For many plugins it probably
doesn't matter which of these functions they implement, but it may be of importance
for, e.g., plugins that implement devices. Such plugins should create their cDevice
derived objects in <tt>Initialize()</tt>, so that other plugins can use them in their
<tt>Start()</tt> functions.
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<p>
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
@@ -467,10 +487,11 @@ from the main menu.
A return value of <i>false</i> indicates that something has gone wrong and the
plugin will not be able to perform its task. In that case, the plugin should
write a proper error message to the log file. The first plugin that returns
<i>false</i> from its <tt>Start()</tt> function will cause VDR to exit.
<i>false</i> from its <tt>Initialize()</tt> or <tt>Start()</tt> function will cause
VDR to exit.
<p>
If the plugin doesn't implement any background functionality or internationalized
texts, it doesn't need to implement this function.
texts, it doesn't need to implement either of these functions.
<a name="Main menu entry"><hr><h2>Main menu entry</h2>
@@ -506,7 +527,7 @@ in the call to VDR.
If the user selects the main menu entry of a plugin, VDR calls the function
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<p><table><tr><td bgcolor=#F0F0F0><pre><br>
virtual cOsdObject *MainMenuAction(void);
</pre></td></tr></table><p>
@@ -759,7 +780,8 @@ void RegisterI18n(const tI18nPhrase * const Phrases);
to register them with VDR's internationalization mechanism.
<p>
The call to this function must be done in the <a href="#Getting started"><tt>Start()</tt></a> function of the plugin:
The call to this function must be done in the <a href="#Getting started"><tt>Initialize()</tt></a>
or <a href="#Getting started"><tt>Start()</tt></a> function of the plugin:
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
const tI18nPhrase Phrases[] = {
@@ -1022,7 +1044,7 @@ virtual void SetAudioTrack(int Index);
</pre></td></tr></table><p>
<p>
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If there is an additional audio track that has to be replayed with external hardware,
the player shall call its member function
@@ -1303,9 +1325,7 @@ The functions to implement replaying capabilites are
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
virtual bool HasDecoder(void) const;
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virtual bool CanReplay(void) const;
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virtual bool SetPlayMode(ePlayMode PlayMode);
virtual void TrickSpeed(int Speed);
virtual void Clear(void);
@@ -1345,20 +1365,19 @@ needed.
<p>
<b>Initializing new devices</b>
<p>
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A derived cDevice class shall implement a static function
<p><table><tr><td bgcolor=#F0F0F0><pre><br>
static bool Initialize(void);
</pre></td></tr></table><p>
in which it determines whether the necessary hardware to run this sort of
device is actually present in this machine (or whatever other prerequisites
might be important), and then creates as many device objects as necessary.
See <tt>VDR/dvbdevice.c</tt> for the implementation of the <tt>cDvbDevice</tt>
initialize function.
<p>
A plugin that adds devices to a VDR instance shall call this initializing
function from its <a href="#Getting started"><tt>Start()</tt></a> function.
A plugin that adds devices to a VDR instance shall call this
function from its <a href="#Getting started"><tt>Initialize()</tt></a> function
to make sure other plugins that may need to have access to all available devices
will see them in their <a href="#Getting started"><tt>Start()</tt></a> function.
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<p>
Nothing needs to be done to shut down the devices. VDR will automatically
shut down (delete) all devices when the program terminates. It is therefore
@@ -1476,7 +1495,7 @@ the incoming data (by calling your <tt>Action()</tt> function).
In case you need to do any other setup steps, like opening a file or initializing
member variables, you should do so before calling <tt>Start()</tt>.
<p>
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If your remote control for some reason can't work (maybe because it was unable to
open some file handle it requires) it can implement the virtual function