Introduced cPlugin::Initialize()

2023-10-10 13:36:52 +02:00 · 2003-05-09 15:27:46 +02:00 · 2003-05-09 15:27:46 +02:00 · dc8fd12f91
commit dc8fd12f91
parent aaeaf4582d
10 changed files with 111 additions and 43 deletions
--- a/1
+++ b/1
@ -200,6 +200,7 @@ Andreas Schultz <aschultz@warp10.net>
 for suggesting a Make.config file
 for making EIT filtering use masks to reduce the number of filters
 for suggesting to remove the Mute() call from cDvbDevice::StillPicture()
+ for suggesting to separate the startup of a plugin into an "early" and a "late" phase

 Aaron Holtzman
 for writing 'ac3dec'
--- a/7
+++ b/7
@ -2108,3 +2108,10 @@ Video Disk Recorder Revision History
  (thanks to Carsten Siebholz).
 - The red ("Record") and yellow ("Pause") button in the "Main" menu are no longer
  available when replaying.
+
+2003-05-09: Version 1.1.31
+
+- Introduced the new function cPlugin::Initialize(), in order to be able to separate
+  the startup of a plugin into an "early" (Initialize()) and "late" (Start()) phase
+  (suggested by Andreas Schultz). Plugin authors should please read the section
+  about "Getting started" in PLUGINS.html and adapt their code if applicable.
--- a/PLUGINS.html
+++ b/PLUGINS.html
@ -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>
-<!--X1.1.14--><table width=100%><tr><td bgcolor=#0000AA>&nbsp;</td><td width=100%>
-Important modifications introduced in version 1.1.14 are marked like this.
-<!--X1.1.14--></td></tr></table>
-<!--X1.1.15--><table width=100%><tr><td bgcolor=#00AA00>&nbsp;</td><td width=100%>
+<!--X1.1.15--><table width=100%><tr><td bgcolor=#0000AA>&nbsp;</td><td width=100%>
 Important modifications introduced in version 1.1.15 are marked like this.
 <!--X1.1.15--></td></tr></table>
-<!--X1.1.17--><table width=100%><tr><td bgcolor=#AA0000>&nbsp;</td><td width=100%>
+<!--X1.1.17--><table width=100%><tr><td bgcolor=#00AA00>&nbsp;</td><td width=100%>
 Important modifications introduced in version 1.1.17 are marked like this.
 <!--X1.1.17--></td></tr></table>
-<!--X1.1.27--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%>
+<!--X1.1.27--><table width=100%><tr><td bgcolor=#AA0000>&nbsp;</td><td width=100%>
 Important modifications introduced in version 1.1.27 are marked like this.
 <!--X1.1.27--></td></tr></table>
+<!--X1.1.31--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%>
+Important modifications introduced in version 1.1.31 are marked like this.
+<!--X1.1.31--></td></tr></table>

 <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
+<!--X1.1.31--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%>
+<a href="#Getting started"><tt>Initialize()</tt></a> or
+<a href="#Getting started"><tt>Start()</tt></a>
+<!--X1.1.31--></td></tr></table>
+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>
+<!--X1.1.31--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%><pre>
+virtual bool Initialize(void);
+<!--X1.1.31--></pre></td></tr></table>
 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.
+<!--X1.1.31--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%>
+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.
+<!--X1.1.31--></td></tr></table>
+<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

-<!--X1.1.17--><table width=100%><tr><td bgcolor=#AA0000>&nbsp;</td><td width=100%>
+<!--X1.1.17--><table width=100%><tr><td bgcolor=#00AA00>&nbsp;</td><td width=100%>
 <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>
-<!--X1.1.15--><table width=100%><tr><td bgcolor=#00AA00>&nbsp;</td><td width=100%>
+<!--X1.1.15--><table width=100%><tr><td bgcolor=#0000AA>&nbsp;</td><td width=100%>
 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;
-<!--X1.1.14--><table width=100%><tr><td bgcolor=#0000AA>&nbsp;</td><td width=100%>
 virtual bool CanReplay(void) const;
-<!--X1.1.14--></td></tr></table>
 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>
+<!--X1.1.31--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%>
 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.
+<!--X1.1.31--></td></tr></table>
 <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>
-<!--X1.1.27--><table width=100%><tr><td bgcolor=#FF0000>&nbsp;</td><td width=100%>
+<!--X1.1.27--><table width=100%><tr><td bgcolor=#AA0000>&nbsp;</td><td width=100%>
 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

--- a/PLUGINS/src/sky/HISTORY
+++ b/PLUGINS/src/sky/HISTORY
@ -8,3 +8,7 @@ VDR Plugin 'sky' Revision History
 2002-12-13: Version 0.1.0

 - Changed setting of CXX and CXXFLAGS variables in Makefile.
+
+2003-05-09: Version 0.1.1
+
+- Changed Start() to Initialize().
--- a/PLUGINS/src/sky/sky.c
+++ b/PLUGINS/src/sky/sky.c
@ -3,7 +3,7 @@
 *
 * See the README file for copyright information and how to reach the author.
 *
- * $Id: sky.c 1.2 2002/12/13 15:01:57 kls Exp $
+ * $Id: sky.c 1.3 2003/05/09 15:27:16 kls Exp $
 */

 #include <sys/socket.h>
@ -14,7 +14,7 @@
 #include <vdr/plugin.h>
 #include <vdr/sources.h>

-static const char *VERSION        = "0.1.0";
+static const char *VERSION        = "0.1.1";
 static const char *DESCRIPTION    = "Sky Digibox interface";

 // --- cDigiboxDevice --------------------------------------------------------
@ -186,7 +186,7 @@ public:
  virtual const char *Description(void) { return DESCRIPTION; }
  virtual const char *CommandLineHelp(void);
  virtual bool ProcessArgs(int argc, char *argv[]);
-  virtual bool Start(void);
+  virtual bool Initialize(void);
  virtual void Housekeeping(void);
  virtual cMenuSetupPage *SetupMenu(void);
  virtual bool SetupParse(const char *Name, const char *Value);
@ -216,9 +216,9 @@ bool cPluginSky::ProcessArgs(int argc, char *argv[])
  return true;
 }

-bool cPluginSky::Start(void)
+bool cPluginSky::Initialize(void)
 {
-  // Start any background activities the plugin shall perform.
+  // Initialize any background activities the plugin shall perform.
  new cDigiboxDevice;
  return true;
 }
--- a/config.h
+++ b/config.h
@ -4,7 +4,7 @@
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
- * $Id: config.h 1.155 2003/04/27 15:56:04 kls Exp $
+ * $Id: config.h 1.156 2003/05/09 15:20:22 kls Exp $
 */

 #ifndef __CONFIG_H
@ -19,7 +19,7 @@
 #include "device.h"
 #include "tools.h"

-#define VDRVERSION "1.1.30"
+#define VDRVERSION "1.1.31"

 #define MAXPRIORITY 99
 #define MAXLIFETIME 99
--- a/9
+++ b/9
@ -12,7 +12,7 @@
 # See the main source file 'vdr.c' for copyright information and
 # how to reach the author.
 #
-# $Id: newplugin 1.14 2002/12/13 14:51:46 kls Exp $
+# $Id: newplugin 1.15 2003/05/09 14:59:28 kls Exp $

 $PLUGIN_NAME = $ARGV[0] || die "Usage: newplugin <name>\n";

@ -162,6 +162,7 @@ public:
  virtual const char *Description(void) { return DESCRIPTION; }
  virtual const char *CommandLineHelp(void);
  virtual bool ProcessArgs(int argc, char *argv[]);
+  virtual bool Initialize(void);
  virtual bool Start(void);
  virtual void Housekeeping(void);
  virtual const char *MainMenuEntry(void) { return MAINMENUENTRY; }
@ -194,6 +195,12 @@ bool cPlugin${PLUGIN_CLASS}::ProcessArgs(int argc, char *argv[])
  return true;
 }

+bool cPlugin${PLUGIN_CLASS}::Initialize(void)
+{
+  // Initialize any background activities the plugin shall perform.
+  return true;
+}
+
 bool cPlugin${PLUGIN_CLASS}::Start(void)
 {
  // Start any background activities the plugin shall perform.
--- a/plugin.c
+++ b/plugin.c
@ -4,7 +4,7 @@
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
- * $Id: plugin.c 1.8 2002/11/16 14:22:37 kls Exp $
+ * $Id: plugin.c 1.9 2003/05/09 15:01:26 kls Exp $
 */

 #include "plugin.h"
@ -50,6 +50,11 @@ bool cPlugin::ProcessArgs(int argc, char *argv[])
  return true;
 }

+bool cPlugin::Initialize(void)
+{
+  return true;
+}
+
 bool cPlugin::Start(void)
 {
  return true;
@ -293,6 +298,22 @@ bool cPluginManager::LoadPlugins(bool Log)
  return true;
 }

+bool cPluginManager::InitializePlugins(void)
+{
+  for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
+      cPlugin *p = dll->Plugin();
+      if (p) {
+         int Language = Setup.OSDLanguage;
+         Setup.OSDLanguage = 0; // the i18n texts are only available _after_ Start()
+         isyslog("initializing plugin: %s (%s): %s", p->Name(), p->Version(), p->Description());
+         Setup.OSDLanguage = Language;
+         if (!p->Initialize())
+            return false;
+         }
+      }
+  return true;
+}
+
 bool cPluginManager::StartPlugins(void)
 {
  for (cDll *dll = dlls.First(); dll; dll = dlls.Next(dll)) {
@ -300,7 +321,7 @@ bool cPluginManager::StartPlugins(void)
      if (p) {
         int Language = Setup.OSDLanguage;
         Setup.OSDLanguage = 0; // the i18n texts are only available _after_ Start()
-         isyslog("starting plugin: %s (%s): %s", p->Name(), p->Version(), p->Description());
+         isyslog("starting plugin: %s", p->Name());
         Setup.OSDLanguage = Language;
         if (!p->Start())
            return false;
--- a/plugin.h
+++ b/plugin.h
@ -4,7 +4,7 @@
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
- * $Id: plugin.h 1.5 2002/11/16 14:22:24 kls Exp $
+ * $Id: plugin.h 1.6 2003/05/09 14:57:55 kls Exp $
 */

 #ifndef __PLUGIN_H
@ -33,6 +33,7 @@ public:
  virtual const char *CommandLineHelp(void);

  virtual bool ProcessArgs(int argc, char *argv[]);
+  virtual bool Initialize(void);
  virtual bool Start(void);
  virtual void Housekeeping(void);

@ -78,6 +79,7 @@ public:
  void SetDirectory(const char *Directory);
  void AddPlugin(const char *Args);
  bool LoadPlugins(bool Log = false);
+  bool InitializePlugins(void);
  bool StartPlugins(void);
  void Housekeeping(void);
  static bool HasPlugins(void);
--- a/vdr.c
+++ b/vdr.c
@ -22,7 +22,7 @@
 *
 * The project's page is at http://www.cadsoft.de/people/kls/vdr
 *
- * $Id: vdr.c 1.152 2003/05/03 13:39:57 kls Exp $
+ * $Id: vdr.c 1.153 2003/05/09 14:14:13 kls Exp $
 */

 #include <getopt.h>
@ -355,9 +355,9 @@ int main(int argc, char *argv[])

  cDvbDevice::Initialize();

-  // Start plugins:
+  // Initialize plugins:

-  if (!PluginManager.StartPlugins())
+  if (!PluginManager.InitializePlugins())
     return 2;

  // Primary device:
@ -437,6 +437,18 @@ int main(int argc, char *argv[])
  if (WatchdogTimeout > 0)
     if (signal(SIGALRM, Watchdog)   == SIG_IGN) signal(SIGALRM, SIG_IGN);

+  // Watchdog:
+
+  if (WatchdogTimeout > 0) {
+     dsyslog("setting watchdog timer to %d seconds", WatchdogTimeout);
+     alarm(WatchdogTimeout); // Initial watchdog timer start
+     }
+
+  // Start plugins:
+
+  if (!PluginManager.StartPlugins())
+     return 2;
+
  // Main program loop:

  cOsdObject *Menu = NULL;
@ -448,11 +460,6 @@ int main(int argc, char *argv[])
  bool ForceShutdown = false;
  bool UserShutdown = false;

-  if (WatchdogTimeout > 0) {
-     dsyslog("setting watchdog timer to %d seconds", WatchdogTimeout);
-     alarm(WatchdogTimeout); // Initial watchdog timer start
-     }
-
  while (!Interrupted) {
        // Handle emergency exits:
        if (cThread::EmergencyExit()) {