-BPM button working, Tap tempo button implemented. Working on Tap Tempo algorithm

src/event.hxx

@@ -28,6 +28,7 @@ namespace Event
     METRONOME_ACTIVE,
     
     TIME_BPM,
+    TIME_TEMPO_TAP,
     
     GUI_PRINT,
   };
@@ -148,6 +149,17 @@ class EventTimeBPM : public EventBase
     EventTimeBPM(float b) : bpm(b) {}
 };
 
+class EventTimeTempoTap : public EventBase
+{
+  public:
+    int type() { return int(TIME_TEMPO_TAP); }
+    uint32_t size() { return sizeof(EventTimeTempoTap); }
+    
+    // no data needed, the event itself is an "event",
+    // jack measures time intervals in frames & does math
+    EventTimeTempoTap(){}
+};
+
 
 // prints the string S in the GUI console
 class EventGuiPrint : public EventBase

src/eventhandlerdsp.cxx

@@ -74,6 +74,12 @@ void handleDspEvents()
             jack_ringbuffer_read( rbToDsp, (char*)&ev, sizeof(EventTimeBPM) );
             jack->getTimeManager()->setBpm(ev.bpm);
           } break; }
+        case Event::TIME_TEMPO_TAP: {
+          if ( availableRead >= sizeof(EventTimeTempoTap) ) {
+            EventTimeTempoTap ev;
+            jack_ringbuffer_read( rbToDsp, (char*)&ev, sizeof(EventTimeTempoTap) );
+            jack->getTimeManager()->tap();
+          } break; }
         default:
           {
             // just do nothing

src/gmastertrack.hxx

@@ -39,7 +39,12 @@ static void gmastertrack_button_callback(Fl_Widget *w, void *data) {
     float bpm = b->value() * 160 + 60; // 60 - 220
     EventTimeBPM e = EventTimeBPM( bpm );
     writeToDspRingbuffer( &e );
-    cout << "GUI writing bpm = " << bpm << endl;
+  }
+  else if ( strcmp( w->label(), "Tap" ) == 0 )
+  {
+    Avtk::Button* b = (Avtk::Button*)w;
+    EventTimeTempoTap e;
+    writeToDspRingbuffer( &e );
   }
   else
   {
@@ -54,8 +59,9 @@ class GMasterTrack : public Fl_Group
       Fl_Group(x, y, w, h),
       title( strdup(l) ),
       bg( x, y , w, h, title ),
+      
+      tapTempo(x + 25 + 22, y + 75, 44, 44,"Tap"),
       /*
-      button1(x + 5, y + 24, 100, 18,"Rec"),
       button2(x + 5, y + 44, 100, 18,"Play"),
       button3(x + 5, y + 64, 100, 18,"Stop"),
       button4(x + 5, y + 84,  48, 18,"-"),
@@ -71,8 +77,10 @@ class GMasterTrack : public Fl_Group
       */
     {
       ID = privateID++;
+      
+      tapTempo.callback( gmastertrack_button_callback, &ID );
+      
       /*
-      button1.callback( gmastertrack_button_callback, &ID );
       button2.callback( gmastertrack_button_callback, &ID );
       button3.callback( gmastertrack_button_callback, &ID );
       button4.callback( gmastertrack_button_callback, &ID );
@@ -97,8 +105,9 @@ class GMasterTrack : public Fl_Group
     char* title;
     
     Avtk::Background bg;
+    
+    Avtk::Button tapTempo;
     /*
-    Avtk::Button button1;
     Avtk::Button button2;
     Avtk::Button button3;
     Avtk::Button button4;

src/gtrack.hxx

@@ -19,7 +19,9 @@
 using namespace std;
 
 static void gtrack_button_callback(Fl_Widget *w, void *data) {
-  int track = *(int*)data;
+  int track = 0;
+  if ( data )
+    track = *(int*)data;
   //cout << "Button " << *(int*)data << " " << w->label() << " clicked" << endl;
   
   if ( strcmp( w->label() , "Rec" ) == 0 )
@@ -49,8 +51,7 @@ static void gtrack_button_callback(Fl_Widget *w, void *data) {
   }
   else if ( strcmp( w->label() , "Vol" ) == 0 )
   {
-    EventLooperLoopLength e = EventLooperLoopLength(track, 0.5);
-    writeToDspRingbuffer( &e );
+    
   }
   else
   {

src/metronome.hxx

@@ -54,7 +54,9 @@ class Metronome : public Observer
     void setFpb(int f)
     {
       fpb = f;
-      //cout << "Looper " << track << " got fpb of " << fpb << endl;
+      
+      // disable play until next beat
+      playPoint = endPoint + 1;
     }
     
     void process(int nframes, Buffers* buffers)

src/timemanager.hxx

@@ -18,49 +18,71 @@ class TimeManager
 {
   public:
     TimeManager():
-        bpm(120),
+        fpb(120),
         oldBeat(0)
     {
+      tapTempoPos = 0;
+      tapTempo[0] = 0;
+      tapTempo[1] = 0;
+      tapTempo[2] = 0;
     }
     
-    void setBpm(float b)
+    void setBpm(float bpm)
     {
-      char buffer [50];
-      sprintf (buffer, "%d", b);
-      //printf ("[%s] is a string %d chars long\n",buffer,n);
+      setFpb( 44100 / bpm * 60 );
+    }
+    void setFpb(float f)
+    {
+      fpb = f;
       
+      char buffer [50];
+      sprintf (buffer, "TM, setFpb() %i", int(f) );
       EventGuiPrint e( buffer );
       writeToGuiRingbuffer( &e );
       
-      bpm = b;
       for(uint i = 0; i < observers.size(); i++)
       {
-        observers.at(i)->setFpb(bpm);
+        observers.at(i)->setFpb(fpb);
       }
     }
     
     void registerObserver(Observer* o)
     {
       observers.push_back(o);
-      int fpb = 44100 / bpm * 60;
-      char buffer [50];
-      sprintf (buffer, "TM, bpm = %i, fpb = %i", int(bpm), fpb );
-      EventGuiPrint e( buffer );
-      writeToGuiRingbuffer( &e );
-      
-      // triggers newly registered object to have bpm set
       o->setFpb( fpb );
     }
     
+    void tap()
+    {
+      if ( tapTempoPos < 3 )
+      {
+        tapTempo[tapTempoPos] = frame;
+      }
+      else
+      {
+        // calculate frames per tap
+        int tapFpb1 = tapTempo[1] - tapTempo[0];
+        int tapFpb2 = tapTempo[2] - tapTempo[1];
+        
+        int average = (tapFpb1 + tapFpb2) / 2;
+        setFpb(average);
+      }
+    }
+    
     void process(Buffers* buffers)
     {
-      int framesPerBeat = (int) buffers->samplerate / (bpm / 60.0);
+      // tap tempo measurements
+      frame = buffers->transportFrame;
+      
+      //int framesPerBeat = (int) buffers->samplerate / (bpm / 60.0);
+      
+      
       
       // time signature?
       buffers->transportPosition->beats_per_bar = 4;
       buffers->transportPosition->beat_type     = 4;
       
-      int beat = buffers->transportFrame / framesPerBeat;
+      int beat = buffers->transportFrame / fpb;
       //int beat = int(beat);
       
       //int tick = int( (beatFloat - beat) * 1920 );
@@ -90,13 +112,21 @@ class TimeManager
       buffers->transportPosition->tick = 0;
       
       buffers->transportPosition->ticks_per_beat = 1920;
+      
+      int bpm = int(buffers->samplerate * fpb / 60.0);
       buffers->transportPosition->beats_per_minute = bpm;
     }
   
   private:
-    float bpm;
+    float fpb;
     int oldBeat;
     
+    // tap tempo measurements
+    int frame;
+    
+    int tapTempoPos;
+    int tapTempo[3];
+    
     std::vector<Observer*> observers;
 };