Added a device hook for detecting whether a device provides EIT data

CONTRIBUTORS

@@ -2754,6 +2754,7 @@ Winfried K
  regarding detaching a receiver from its device before deleting it
  for fixing some copy&paste errors in PLUGINS.html
  for fixing the size of cChannel::dtypes[]
+ for adding a device hook for detecting whether a device provides EIT data
 
 Hans-Werner Hilse <hilse@web.de>
  for adding the command line option --userdump to enable core dumps in case VDR

HISTORY

@@ -9460,3 +9460,5 @@ Video Disk Recorder Revision History
 - Fixed the size of cChannel::dtypes[] (thanks to Winfried Köhler).
   The version numbers (both VDRVERSNUM and APIVERSNUM) have been bumped to 2.4.3 to
   indicate this change.
+- Added a device hook for detecting whether a device provides EIT data (thanks to
+  Winfried Köhler).

PLUGINS.html

@@ -2025,8 +2025,9 @@ operator!
 <b>Device hooks</b>
 <p>
 VDR has builtin facilities that select which device is able to provide a given
-transponder. However, there may be situations where the setup is so special
+transponder, or, which device may provide EIT data. However, there may be
-that it requires considerations that exceed the scope of the core VDR code.
+situations where the setup is so special that it requires considerations that
+exceed the scope of the core VDR code.
 This is where <i>device hooks</i> can be used.
 
 <p><table><tr><td class="code"><pre>
@@ -2034,6 +2035,7 @@ class cMyDeviceHook : public cDeviceHook {
 public:
   cMyDeviceHook(void);
   virtual bool DeviceProvidesTransponder(const cDevice *Device, const cChannel *Channel) const;
+  virtual bool DeviceProvidesEIT(const cDevice *Device) const;
   };
 </pre></td></tr></table><p>
 
@@ -2050,6 +2052,19 @@ bool cMyDeviceHook::DeviceProvidesTransponder(const cDevice *Device, const cChan
 }
 </pre></td></tr></table><p>
 
+In its <tt>DeviceProvidesEIT()</tt> function the device hook can take
+whatever actions are necessary to determine whether the given Device can
+provide EIT data, as in
+
+<p><table><tr><td class="code"><pre>
+bool cMyDeviceHook::DeviceProvidesEIT(const cDevice *Device) const
+{
+  if (<i>condition where Device can't provide EIT data</i>)
+     return false;
+  return true;
+}
+</pre></td></tr></table><p>
+
 A plugin that creates a derived cDeviceHook shall do so in its <tt>Initialize()</tt>
 function, as in
 

device.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.c 4.30 2019/05/28 14:50:11 kls Exp $
+ * $Id: device.c 4.31 2020/06/10 14:52:43 kls Exp $
  */
 
 #include "device.h"
@@ -58,6 +58,11 @@ bool cDeviceHook::DeviceProvidesTransponder(const cDevice *Device, const cChanne
   return true;
 }
 
+bool cDeviceHook::DeviceProvidesEIT(const cDevice *Device) const
+{
+  return true;
+}
+
 // --- cDevice ---------------------------------------------------------------
 
 // The minimum number of unknown PS1 packets to consider this a "pre 1.3.19 private stream":
@@ -718,6 +723,17 @@ bool cDevice::DeviceHooksProvidesTransponder(const cChannel *Channel) const
   return true;
 }
 
+bool cDevice::DeviceHooksProvidesEIT(void) const
+{
+  cDeviceHook *Hook = deviceHooks.First();
+  while (Hook) {
+        if (!Hook->DeviceProvidesEIT(this))
+           return false;
+        Hook = deviceHooks.Next(Hook);
+        }
+  return true;
+}
+
 bool cDevice::ProvidesTransponder(const cChannel *Channel) const
 {
   return false;

device.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: device.h 4.15 2020/05/04 11:40:44 kls Exp $
+ * $Id: device.h 4.16 2020/06/10 14:52:43 kls Exp $
  */
 
 #ifndef __DEVICE_H
@@ -95,6 +95,8 @@ public:
           ///< program ends.
   virtual bool DeviceProvidesTransponder(const cDevice *Device, const cChannel *Channel) const;
           ///< Returns true if the given Device can provide the given Channel's transponder.
+  virtual bool DeviceProvidesEIT(const cDevice *Device) const;
+          ///< Returns true if the given Device can provide EIT data.
   };
 
 /// The cDevice class is the base from which actual devices can be derived.
@@ -236,6 +238,7 @@ private:
   static cList<cDeviceHook> deviceHooks;
 protected:
   bool DeviceHooksProvidesTransponder(const cChannel *Channel) const;
+  bool DeviceHooksProvidesEIT(void) const;
 
 // SPU facilities
 

dvbdevice.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbdevice.c 4.22 2020/05/04 08:50:20 kls Exp $
+ * $Id: dvbdevice.c 4.23 2020/06/10 14:52:43 kls Exp $
  */
 
 #include "dvbdevice.h"
@@ -2244,7 +2244,7 @@ bool cDvbDevice::ProvidesChannel(const cChannel *Channel, int Priority, bool *Ne
 
 bool cDvbDevice::ProvidesEIT(void) const
 {
-  return dvbTuner != NULL;
+  return dvbTuner != NULL && DeviceHooksProvidesEIT();
 }
 
 int cDvbDevice::NumProvidedSystems(void) const