ardour/livetrax
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Make tap tempo use g_get_monotonic_time(), and fix minimum BPM

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gettimeofday() is not guaranteed to be monotonic: use
g_get_monotonic_time() instead.

Also, fix calculation of slowest tap tempo BPM so that the slowest tempo
which can be set by tapping is 10 BPM rather than 240.
This commit is contained in:
Colin Fletcher 2014-05-16 18:50:30 +01:00
parent 61d413ada4
commit 7815aa1e89
2 changed files with 7 additions and 9 deletions
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14
gtk2_ardour/tempo_dialog.cc
View File

@ -257,18 +257,16 @@ TempoDialog::pulse_change ()
void
TempoDialog::tap_tempo ()
{
struct timeval now;
gettimeofday (&now, NULL);
gint64 now;
now = g_get_monotonic_time (); // microseconds
if (last_tap.tv_sec >= 0 || last_tap.tv_usec > 0) {
struct timeval diff;
if (last_tap > 0) {
double interval, bpm;
static const double decay = 0.5;
timersub (&now, &last_tap, &diff);
interval = diff.tv_sec + diff.tv_usec * 1.0e-6;
if (interval <= 0.25) {
// >= 15 bpm, say
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);

2
gtk2_ardour/tempo_dialog.h
View File

@ -57,7 +57,7 @@ private:
typedef std::map<std::string,float> NoteTypes;
NoteTypes note_types;
struct timeval last_tap;
gint64 last_tap;
double average_interval;
Gtk::ComboBoxText pulse_selector;