ardour/livetrax
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fix up fwd/reverse stuff in semitone mode

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git-svn-id: svn://localhost/ardour2/branches/3.0@9407 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Paul Davis 2011-04-22 16:18:51 +00:00
parent c37722f7dc
commit 35a966c824
2 changed files with 95 additions and 41 deletions
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127
gtk2_ardour/shuttle_control.cc
View File

@ -112,14 +112,16 @@ ShuttleControl::map_transport_state ()
{
float speed = _session->transport_speed ();
if (speed != 0.0) {
if (fabs(speed) <= (2*DBL_EPSILON)) {
shuttle_fract = 0;
} else {
if (Config->get_shuttle_units() == Semitones) {
shuttle_fract = semitones_as_fract (speed_as_semitones (speed));
bool reverse;
int semi = speed_as_semitones (speed, reverse);
shuttle_fract = semitones_as_fract (semi, reverse);
} else {
shuttle_fract = speed/shuttle_max_speed;
}
} else {
shuttle_fract = 0;
}
queue_draw ();
@ -296,21 +298,46 @@ ShuttleControl::on_scroll_event (GdkEventScroll* ev)
return true;
}
switch (ev->direction) {
case GDK_SCROLL_UP:
switch (ev->direction) {
case GDK_SCROLL_UP:
case GDK_SCROLL_RIGHT:
shuttle_fract += 0.005;
break;
case GDK_SCROLL_DOWN:
break;
case GDK_SCROLL_DOWN:
case GDK_SCROLL_LEFT:
shuttle_fract -= 0.005;
break;
default:
return false;
}
break;
default:
return false;
}
if (Config->get_shuttle_units() == Semitones) {
use_shuttle_fract (true);
float lower_side_of_dead_zone = semitones_as_fract (-24, true);
float upper_side_of_dead_zone = semitones_as_fract (-24, false);
/* if we entered the "dead zone" (-24 semitones in forward or reverse), jump
to the far side of it.
*/
if (shuttle_fract > lower_side_of_dead_zone && shuttle_fract < upper_side_of_dead_zone) {
switch (ev->direction) {
case GDK_SCROLL_UP:
case GDK_SCROLL_RIGHT:
shuttle_fract = upper_side_of_dead_zone;
break;
case GDK_SCROLL_DOWN:
case GDK_SCROLL_LEFT:
shuttle_fract = lower_side_of_dead_zone;
break;
default:
/* impossible, checked above */
return false;
}
}
}
use_shuttle_fract (true);
return true;
}
@ -355,33 +382,41 @@ ShuttleControl::set_shuttle_fract (double f)
}
int
ShuttleControl::speed_as_semitones (float speed)
ShuttleControl::speed_as_semitones (float speed, bool& reverse)
{
assert (speed != 0.0);
if (speed < 0.0) {
reverse = true;
return (int) round (12.0 * fast_log2 (-speed));
} else {
reverse = false;
return (int) round (12.0 * fast_log2 (speed));
}
}
float
ShuttleControl::semitones_as_speed (int semi)
ShuttleControl::semitones_as_speed (int semi, bool reverse)
{
return pow (2.0, (semi / 12.0));
if (reverse) {
return -pow (2.0, (semi / 12.0));
} else {
return pow (2.0, (semi / 12.0));
}
}
float
ShuttleControl::semitones_as_fract (int semi)
ShuttleControl::semitones_as_fract (int semi, bool reverse)
{
double const step = 1.0 / 24.0; // range is 24 semitones up & down
return semi * step;
float speed = semitones_as_speed (semi, reverse);
return speed/4.0; /* 4.0 is the maximum speed for a 24 semitone shift */
}
int
ShuttleControl::fract_as_semitones (float fract)
ShuttleControl::fract_as_semitones (float fract, bool& reverse)
{
double const step = 1.0 / 24.0; // range is 24 semitones up & down
return (int) round (shuttle_fract / step);
assert (fract != 0.0);
return speed_as_semitones (fract * 4.0, reverse);
}
void
@ -389,13 +424,8 @@ ShuttleControl::use_shuttle_fract (bool force)
{
microseconds_t now = get_microseconds();
if (Config->get_shuttle_units() == Semitones) {
shuttle_fract = max (-1.0f, shuttle_fract);
shuttle_fract = min (1.0f, shuttle_fract);
} else {
shuttle_fract = max (-shuttle_max_speed, shuttle_fract);
shuttle_fract = min (shuttle_max_speed, shuttle_fract);
}
shuttle_fract = max (-1.0f, shuttle_fract);
shuttle_fract = min (1.0f, shuttle_fract);
/* do not attempt to submit a motion-driven transport speed request
more than once per process cycle.
@ -409,11 +439,17 @@ ShuttleControl::use_shuttle_fract (bool force)
double speed = 0;
if (Config->get_shuttle_units() == Semitones) {
speed = semitones_as_speed (fract_as_semitones (shuttle_fract));
} else {
speed = shuttle_max_speed * shuttle_fract;
}
if (Config->get_shuttle_units() == Semitones) {
if (shuttle_fract != 0.0) {
bool reverse;
int semi = fract_as_semitones (shuttle_fract, reverse);
speed = semitones_as_speed (semi, reverse);
} else {
speed = 0.0;
}
} else {
speed = shuttle_max_speed * shuttle_fract;
}
_session->request_transport_speed_nonzero (speed);
}
@ -452,16 +488,33 @@ ShuttleControl::on_expose_event (GdkEventExpose* event)
/* speed text */
char buf[32];
if (speed != 0) {
if (Config->get_shuttle_units() == Percentage) {
if (speed == 1.0) {
snprintf (buf, sizeof (buf), _("Playing"));
} else {
snprintf (buf, sizeof (buf), "%d%%", (int) round (speed * 100));
if (speed < 0.0) {
snprintf (buf, sizeof (buf), "<<< %d%%", (int) round (-speed * 100));
} else {
snprintf (buf, sizeof (buf), ">>> %d%%", (int) round (speed * 100));
}
}
} else {
snprintf (buf, sizeof (buf), "%+d semitones", speed_as_semitones (speed));
bool reversed;
int semi = speed_as_semitones (speed, reversed);
if (reversed) {
snprintf (buf, sizeof (buf), _("<<< %+d semitones"), semi);
} else {
snprintf (buf, sizeof (buf), _(">>> %+d semitones"), semi);
}
}
} else {
snprintf (buf, sizeof (buf), _("Stopped"));
}

9
gtk2_ardour/shuttle_control.h
View File

@ -91,10 +91,11 @@ class ShuttleControl : public Gtk::DrawingArea, public ARDOUR::SessionHandlePtr
void set_shuttle_units (ARDOUR::ShuttleUnits);
void set_shuttle_style (ARDOUR::ShuttleBehaviour);
int speed_as_semitones (float);
float semitones_as_speed (int);
float semitones_as_fract (int);
int fract_as_semitones (float);
int speed_as_semitones (float, bool&);
int fract_as_semitones (float, bool&);
float semitones_as_speed (int, bool);
float semitones_as_fract (int, bool);
};
#endif /* __gtk2_ardour_shuttle_control_h__ */