if a (file) source really cannot be found, differentiate between audio & MIDI.

[ardour.git] / gtk2_ardour / tempo_dialog.cc

diff --git a/gtk2_ardour/tempo_dialog.cc b/gtk2_ardour/tempo_dialog.cc
index 7c0e510aff8fd92dbcddb388788db25d7d109f6c..a96958136910827123c3630fa8240e5db65627df 100644 (file)
--- a/gtk2_ardour/tempo_dialog.cc
+++ b/gtk2_ardour/tempo_dialog.cc
@@ -42,6 +42,7 @@ TempoDialog::TempoDialog (TempoMap& map, framepos_t frame, const string&)
        , when_bar_label (_("bar:"), ALIGN_LEFT, ALIGN_CENTER)
        , when_beat_label (_("beat:"), ALIGN_LEFT, ALIGN_CENTER)
        , pulse_selector_label (_("Pulse note"), ALIGN_LEFT, ALIGN_CENTER)
+       , tap_tempo_button (_("Tap tempo"))
 {
        Timecode::BBT_Time when;
        Tempo tempo (map.tempo_at (frame));
@@ -57,6 +58,7 @@ TempoDialog::TempoDialog (TempoSection& section, const string&)
        , when_bar_label (_("bar:"), ALIGN_LEFT, ALIGN_CENTER)
        , when_beat_label (_("beat:"), ALIGN_LEFT, ALIGN_CENTER)
        , pulse_selector_label (_("Pulse note"), ALIGN_LEFT, ALIGN_CENTER)
+       , tap_tempo_button (_("Tap tempo"))
 {
        init (section.start(), section.beats_per_minute(), section.note_type(), section.movable());
 }
@@ -162,6 +164,8 @@ TempoDialog::init (const Timecode::BBT_Time& when, double bpm, double note_type,
        set_default_response (RESPONSE_ACCEPT);
 
        bpm_spinner.show ();
+       tap_tempo_button.show ();
+       get_vbox()->pack_end (tap_tempo_button);
 
        set_name ("MetricDialog");
 
@@ -174,6 +178,7 @@ TempoDialog::init (const Timecode::BBT_Time& when, double bpm, double note_type,
        when_beat_entry.signal_activate().connect (sigc::bind (sigc::mem_fun (*this, &TempoDialog::response), RESPONSE_ACCEPT));
        when_beat_entry.signal_key_release_event().connect (sigc::mem_fun (*this, &TempoDialog::entry_key_release), false);
        pulse_selector.signal_changed().connect (sigc::mem_fun (*this, &TempoDialog::pulse_change));
+       tap_tempo_button.signal_clicked().connect (sigc::mem_fun (*this, &TempoDialog::tap_tempo));
 }
 
 void
@@ -249,6 +254,36 @@ TempoDialog::pulse_change ()
         set_response_sensitive (RESPONSE_ACCEPT, true);
 }
 
+void
+TempoDialog::tap_tempo ()
+{
+       gint64 now;
+       now = g_get_monotonic_time (); // microseconds
+
+       if (last_tap > 0) {
+               double interval, bpm;
+               static const double decay = 0.5;
+
+               interval = (now - last_tap) * 1.0e-6;
+               if (interval <= 6.0) {
+                       // >= 10 bpm, say
+                       if (average_interval > 0) {
+                               average_interval = interval * decay
+                                       + average_interval * (1.0-decay);
+                       } else {
+                               average_interval = interval;
+                       }
+
+                       bpm = 60.0 / average_interval;
+                       bpm_spinner.set_value (bpm);
+               } else {
+                       average_interval = 0;
+               }
+       } else {
+               average_interval = 0;
+       }
+       last_tap = now;
+}
 
 MeterDialog::MeterDialog (TempoMap& map, framepos_t frame, const string&)
        : ArdourDialog (_("New Meter"))