Add general methods for emitting and retrieving TV playback status vi…

…a Qt signals.

Those methods will be used in order to retrieve TV playback status in a synchronous fashion by AirPlay.
Ultimately, all current status events should have their signals equivalent

Make distclean && configure is required

mythtv/libs/libmythbase/mythcorecontext.h

@@ -45,8 +45,9 @@ class MythScheduler;
  *   It also contains support for database error printing, and
  *   database message logging.
  */
-class MBASE_PUBLIC MythCoreContext : public MythObservable, public MythSocketCBs
+class MBASE_PUBLIC MythCoreContext : public QObject, public MythObservable, public MythSocketCBs
 {
+    Q_OBJECT
   public:
     MythCoreContext(const QString &binversion, QObject *eventHandler);
     virtual ~MythCoreContext();
@@ -167,7 +168,23 @@ class MBASE_PUBLIC MythCoreContext : public MythObservable, public MythSocketCBs
     QString GetLanguage(void);
     QString GetLanguageAndVariant(void);
     void ResetLanguage(void);
-
+
+    // signal related methods
+    void emitTVPlaybackStarted(void)            { emit TVPlaybackStarted(); }
+    void emitTVPlaybackStopped(void)            { emit TVPlaybackStopped(); }
+    void emitTVPlaybackSought(qint64 position)  { emit TVPlaybackSought(position); }
+    void emitTVPlaybackPaused(void)             { emit TVPlaybackPaused(); }
+    void emitTVPlaybackUnpaused(void)           { emit TVPlaybackUnpaused(); }
+    void emitTVPlaybackAborted(void)            { emit TVPlaybackAborted(); }
+
+  signals:
+    void TVPlaybackStarted(void);
+    void TVPlaybackStopped(void);
+    void TVPlaybackSought(qint64 position);
+    void TVPlaybackPaused(void);
+    void TVPlaybackUnpaused(void);
+    void TVPlaybackAborted(void);
+
   private:
     MythCoreContextPrivate *d;