-Implementing TimeManager class, using Observer pattern for updates

src/buffers.hxx

@@ -2,6 +2,8 @@
 #ifndef LUPPP_BUFFERS_H
 #define LUPPP_BUFFERS_H
 
+#include <jack/transport.h>
+
 class Buffers
 {
   public:
@@ -15,6 +17,15 @@ class Buffers
       MASTER_OUTPUT = 0,
       MASTER_INPUT,
     };
+    
+    // Jack details
+    jack_nframes_t         nframes;
+    jack_nframes_t         samplerate;
+    
+    jack_nframes_t         transportFrame;
+    jack_position_t        transportPosition;
+    jack_transport_state_t transportState;
+    
 };
 
 #endif // LUPPP_BUFFERS_H

src/jack.cxx

@@ -17,8 +17,8 @@ Jack::Jack()
   // open the client
   client = jack_client_open ( "Luppp", JackNullOption , 0 , 0 );
   
-  nframes = jack_get_buffer_size( client );
-  samplerate = jack_get_sample_rate( client );
+  buffers.nframes = jack_get_buffer_size( client );
+  buffers.samplerate = jack_get_sample_rate( client );
   
   masterOutput = jack_port_register( client,
                           "master_out",
@@ -33,12 +33,21 @@ Jack::Jack()
                           0 );
   
   if ( jack_set_process_callback( client,
-                                      static_process,
-                                      static_cast<void*>(this)) )
+                                  static_process,
+                                  static_cast<void*>(this)) )
   {
     cerr << "Jack() error setting process callback" << endl;
   }
   
+  if ( jack_set_timebase_callback(client,
+                                  0,
+                                  (JackTimebaseCallback)static_timebase,
+                                  static_cast<void*>(this)) )
+  {
+    cerr << "Jack() error setting timebase callback" << endl;
+  }
+  
+  
   loopers.push_back( new Looper() );
 }
 
@@ -61,6 +70,7 @@ int Jack::process (jack_nframes_t nframes)
   // pre-zero output buffers
   memset( buffers.audio[Buffers::MASTER_OUTPUT], 0, sizeof(float) * nframes );
   
+  
   loopers.at(0)->process(nframes, &buffers );
   
   /*
@@ -86,11 +96,19 @@ int Jack::getSamplerate()
   return jack_get_sample_rate( client );
 }
 
-int Jack::timebase(jack_transport_state_t,
-                   jack_nframes_t,
-                   jack_position_t*,
-                   int)
+int Jack::timebase(jack_transport_state_t state,
+                   jack_nframes_t nframes,
+                   jack_position_t* pos,
+                   int newPos)
 {
+  // fill buffers with data, then pass to timeManager
+  buffers.transportFrame    = jack_get_current_transport_frame(client);
+  buffers.transportPosition = *pos;
+  buffers.transportState    = state;
+  
+  // update "time" from JACK master, or write master?
+  timeManager.process( &buffers );
+  
   return 0;
 }
 
@@ -107,4 +125,3 @@ int Jack::static_timebase(jack_transport_state_t state,
 {
   return static_cast<Jack*>(instance)->timebase(state,nframes, pos, newPos );
 }
-

src/jack.hxx

@@ -15,8 +15,10 @@
 #include <cstring>
 #include <jack/jack.h>
 #include <jack/midiport.h>
+#include <jack/transport.h>
 
 #include "looper.hxx"
+#include "timemanager.hxx"
 
 using namespace std;
 
@@ -36,6 +38,7 @@ class Jack
   
   private:
     Buffers buffers;
+    TimeManager timeManager;
     
     vector<Looper*> loopers;
     

src/timemanager.hxx

@@ -0,0 +1,53 @@
+
+#ifndef LUPPP_TIME_H
+#define LUPPP_TIME_H
+
+#include <iostream>
+
+#include "buffers.hxx"
+
+using namespace std;
+
+// inherits from ObserverSubject
+class TimeManager
+{
+  public:
+    TimeManager()
+    {
+    }
+    
+    void process(Buffers* buffers)
+    {
+      float bpm = 120;
+      int framesPerBeat = (int) samplerate / (bpm / 60.0);
+      
+      // divide by zero errors!
+      if ( framesPerBeat > 0 )
+      {
+        int newBeat = buffers->transportFrame / framesPerBeat;
+      }
+      //cout << buffers->transportPosition.frame << endl;
+    }
+  
+  private:
+    int samplerate;
+    
+    // list of Observers of this TimeManager Subject, "beat", "bar" updates?
+    /*
+    for(int i = 0; i < numObservers; i++ )
+    {
+      observers[i]->notifyNewBeat(int beat);
+    }
+    
+    if ( bar != oldBar )
+    {
+      for(int i = 0; i < numObservers; i++ )
+      {
+        observers[i]->notifyNewBar(int bar);
+      }
+    }
+    */
+    
+};
+
+#endif // LUPPP_TIME_H