ardour/livetrax
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Make 'Tap tempo' set the bpm to a running average

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Keep a running average of the interval between clicks on the 'Tap tempo'
button, and use that average to set the bpm value.
This commit is contained in:
Colin Fletcher 2014-02-12 21:49:00 +00:00
parent e0eaea6471
commit 61d413ada4
2 changed files with 17 additions and 5 deletions
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21
gtk2_ardour/tempo_dialog.cc
View File

@ -263,17 +263,28 @@ TempoDialog::tap_tempo ()
if (last_tap.tv_sec >= 0 || last_tap.tv_usec > 0) {
struct timeval diff;
double interval, bpm;
static const double decay = 0.5;
timersub (&now, &last_tap, &diff);
interval = diff.tv_sec + diff.tv_usec * 1.0e-6;
bpm = 60.0 / interval;
if (bpm >= 20) {
if (interval <= 0.25) {
// >= 15 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&)

1
gtk2_ardour/tempo_dialog.h
View File

@ -58,6 +58,7 @@ private:
NoteTypes note_types;
struct timeval last_tap;
double average_interval;
Gtk::ComboBoxText pulse_selector;
Gtk::Adjustment bpm_adjustment;