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Special-case VCA at 0 (-inf dB), force gain slaves to -inf dB

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This commit is contained in:
Robin Gareus 2017-06-14 15:14:56 +02:00
parent e0a1c7690a
commit 22bddf5434
4 changed files with 14 additions and 6 deletions
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1
libs/ardour/ardour/gain_control.h
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@ -51,6 +51,7 @@ class LIBARDOUR_API GainControl : public SlavableAutomationControl {
void inc_gain (gain_t);
protected:
void post_add_master (boost::shared_ptr<AutomationControl>);
bool get_masters_curve_locked (framepos_t, framepos_t, float*, framecnt_t) const;
};

4
libs/ardour/ardour/slavable_automation_control.h
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@ -99,9 +99,9 @@ protected:
double val_ctrl () const { return _val_ctrl; }
double val_master () const { return _val_master; }
double val_master_inv () const { return _val_master == 0 ? 1.0 : 1.0 / _val_master; }
double master_ratio () const { return _val_master == 0 ? master()->get_value() : master()->get_value() / _val_master; }
double val_master_inv () const { return _val_master == 0 ? 0 : 1.0 / _val_master; }
double master_ratio () const { return _val_master == 0 ? 0 : master()->get_value() / _val_master; }
int set_state (XMLNode const&, int);

9
libs/ardour/gain_control.cc
View File

@ -102,6 +102,15 @@ GainControl::inc_gain (gain_t factor)
}
}
void
GainControl::post_add_master (boost::shared_ptr<AutomationControl> m)
{
if (m->get_value() == 0) {
/* master is at -inf, which forces this ctrl to -inf on assignment */
Changed (false, Controllable::NoGroup); /* EMIT SIGNAL */
}
}
bool
GainControl::get_masters_curve_locked (framepos_t start, framepos_t end, float* vec, framecnt_t veclen) const
{

6
libs/ardour/slavable_automation_control.cc
View File

@ -150,9 +150,7 @@ SlavableAutomationControl::masters_curve_multiply (framepos_t start, framepos_t
= boost::dynamic_pointer_cast<SlavableAutomationControl>(mr->second.master());
assert (sc);
rv |= sc->masters_curve_multiply (start, end, vec, veclen);
if (mr->second.val_master () != 0) {
apply_gain_to_buffer (vec, veclen, 1.f / mr->second.val_master ());
}
apply_gain_to_buffer (vec, veclen, mr->second.val_master_inv ());
}
return rv;
}
@ -166,7 +164,7 @@ SlavableAutomationControl::reduce_by_masters_locked (double value, bool ignore_a
/* need to scale given value by current master's scaling */
const double masters_value = get_masters_value_locked();
if (masters_value == 0.0) {
value = 0.0; // XXX 1.0, see master_ratio(), val_master_inv()
value = 0.0;
} else {
value /= masters_value;
value = std::max (lower(), std::min(upper(), value));