add implementation of PlayProcess logic

src/common/interfaceproxy.cpp

@@ -163,6 +163,11 @@ namespace lumiera {
         //----Proxy-Implementation-of-DummyPlayer--------
         typedef proc::DummyPlayer::Process Process;
         
+        /** @note as an optimisation we hand out a direct reference
+         *  to the implementing process object. While this ref could
+         *  still be passed as handle to the C Language interface, using
+         *  it directly within the client (=GUI) retains only on level
+         *  of indirection, irrespective which interface is used. */
         Process& start()                           
           { 
             Process* pP = static_cast<Process*> (_i_.startPlay());

src/proc/dummy-player-service.cpp

@@ -247,7 +247,7 @@ namespace proc {
     , implInstance_(this,_instance)
     , serviceInstance_( LUMIERA_INTERFACE_REF (lumieraorg_DummyPlayer, 0, lumieraorg_DummyPlayerFacade))
   {
-    INFO (operate, "GuiNotification Facade opened.");
+    INFO (operate, "DummyPlayer Facade opened.");
   }
   
   
@@ -260,7 +260,8 @@ namespace proc {
     return theDescriptor();
   }
   
-  DummyPlayer::~DummyPlayer()      { }   ///< emit the vtable here into this translation unit within liblumieraproc.so ...
+  // emit the vtable here into this translation unit within liblumieraproc.so ...
+  DummyPlayer::~DummyPlayer()      { }
   DummyPlayer::Process::~Process() { }
   
   
@@ -268,7 +269,22 @@ namespace proc {
   DummyPlayer::Process& 
   DummyPlayerService::start()
     {
-      UNIMPLEMENTED ("initiate a new playback process");
+      REQUIRE (!theProcess_.isActive());
+      theProcess_.setRate(25);
+      
+      return theProcess_;
+    }
+  
+  
+  
+  void
+  ProcessImpl::setRate (uint fps)
+    {
+      REQUIRE (fps==0 || fps_==0 );
+      REQUIRE (fps==0 || !play_  );
+      
+      fps_ = fps;
+      play_ = (fps != 0);
     }
   
   
@@ -276,7 +292,8 @@ namespace proc {
   void
   ProcessImpl::pause(bool doPlay)
     {
-      UNIMPLEMENTED ("pause playback");
+      REQUIRE (isActive());
+      play_ = doPlay;
     }
   
   
@@ -284,6 +301,8 @@ namespace proc {
   void* const 
   ProcessImpl::getFrame()
     {
+      REQUIRE (isActive());
+      
       UNIMPLEMENTED ("actually deliver a frame");
     }
 

src/proc/dummy-player-service.hpp

@@ -59,8 +59,20 @@ namespace proc {
       void        pause(bool doPlay);
       void* const getFrame();
       
+      uint fps_;
+      bool play_; 
+      
     public:
-      ProcessImpl() {}
+      ProcessImpl() : fps_(0), play_(false) {}
+      
+      /* Implementation-level API to be used By DummyPlayerService */
+      
+      /** activate a playback process 
+       *  with given specification */
+      void setRate (uint fps);
+      
+      bool isActive () { return fps_ != 0; }
+      bool isPlaying() { return play_; }
     };