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

[ardour.git] / libs / ardour / gain_control.cc

diff --git a/libs/ardour/gain_control.cc b/libs/ardour/gain_control.cc
index eeb49e7de04fecc214892faa049bb6ae5b17b49c..7b0f4e404c0d0c93d5d09e58a685b1858eef0d29 100644 (file)
--- a/libs/ardour/gain_control.cc
+++ b/libs/ardour/gain_control.cc
@@ -16,48 +16,36 @@
     675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <cmath>
+
+#include "pbd/convert.h"
+#include "pbd/strsplit.h"
+
+#include "evoral/Curve.hpp"
+
 #include "ardour/dB.h"
 #include "ardour/gain_control.h"
 #include "ardour/session.h"
+#include "ardour/vca.h"
+#include "ardour/vca_manager.h"
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
 using namespace ARDOUR;
 using namespace std;
 
 GainControl::GainControl (Session& session, const Evoral::Parameter &param, boost::shared_ptr<AutomationList> al)
-       : AutomationControl (session, param, ParameterDescriptor(param),
-                            al ? al : boost::shared_ptr<AutomationList> (new AutomationList (param)),
-                            param.type() == GainAutomation ? X_("gaincontrol") : X_("trimcontrol")) {
-
+       : SlavableAutomationControl (session, param, ParameterDescriptor(param),
+                                    al ? al : boost::shared_ptr<AutomationList> (new AutomationList (param)),
+                                    param.type() == GainAutomation ? X_("gaincontrol") : X_("trimcontrol"),
+                                    Controllable::GainLike)
+{
        alist()->reset_default (1.0);
 
        lower_db = accurate_coefficient_to_dB (_desc.lower);
        range_db = accurate_coefficient_to_dB (_desc.upper) - lower_db;
 }
 
-void
-GainControl::set_value (double val, PBD::Controllable::GroupControlDisposition group_override)
-{
-       if (writable()) {
-               _set_value (val, group_override);
-       }
-}
-
-void
-GainControl::set_value_unchecked (double val)
-{
-       /* used only automation playback */
-       _set_value (val, Controllable::NoGroup);
-}
-
-void
-GainControl::_set_value (double val, Controllable::GroupControlDisposition group_override)
-{
-       AutomationControl::set_value (std::max (std::min (val, (double)_desc.upper), (double)_desc.lower), group_override);
-       _session.set_dirty ();
-}
-
 double
 GainControl::internal_to_interface (double v) const
 {
@@ -97,82 +85,40 @@ GainControl::get_user_string () const
        return std::string(theBuf);
 }
 
-gain_t
-GainControl::get_master_gain () const
-{
-       Glib::Threads::Mutex::Lock sm (master_lock, Glib::Threads::TRY_LOCK);
-
-       if (sm.locked()) {
-               return get_master_gain_locked ();
-       }
-
-       return 1.0;
-}
-
-gain_t
-GainControl::get_master_gain_locked () const
-{
-       /* Master lock MUST be held */
-
-       gain_t g = 1.0;
-
-       for (Masters::const_iterator m = _masters.begin(); m != _masters.end(); ++m) {
-               g *= (*m)->get_value ();
-       }
-
-       return g;
-}
-
 void
-GainControl::add_master (boost::shared_ptr<GainControl> m)
+GainControl::inc_gain (gain_t factor)
 {
-       gain_t old_master_val;
-       gain_t new_master_val;
-
-       {
-               Glib::Threads::Mutex::Lock lm (master_lock);
-               old_master_val = get_master_gain_locked ();
-               _masters.push_back (m);
-               new_master_val = get_master_gain_locked ();
-       }
+       /* To be used ONLY when doing group-relative gain adjustment, from
+        * ControlGroup::set_group_values().
+        */
 
-       if (old_master_val != new_master_val) {
-               Changed(); /* EMIT SIGNAL */
+       const float desired_gain = get_value ();
+
+       if (fabsf (desired_gain) < GAIN_COEFF_SMALL) {
+               // really?! what's the idea here?
+               actually_set_value (0.000001f + (0.000001f * factor), Controllable::ForGroup);
+       } else {
+               actually_set_value (desired_gain + (desired_gain * factor), Controllable::ForGroup);
        }
 }
 
 void
-GainControl::remove_master (boost::shared_ptr<GainControl> m)
+GainControl::post_add_master (boost::shared_ptr<AutomationControl> m)
 {
-       gain_t old_master_val;
-       gain_t new_master_val;
-
-       {
-               Glib::Threads::Mutex::Lock lm (master_lock);
-               old_master_val = get_master_gain_locked ();
-               _masters.remove (m);
-               new_master_val = get_master_gain_locked ();
-       }
-
-       if (old_master_val != new_master_val) {
-               Changed(); /* EMIT SIGNAL */
+       if (m->get_value() == 0) {
+               /* master is at -inf, which forces this ctrl to -inf on assignment */
+               Changed (false, Controllable::NoGroup); /* EMIT SIGNAL */
        }
 }
 
-void
-GainControl::clear_masters ()
+bool
+GainControl::get_masters_curve_locked (framepos_t start, framepos_t end, float* vec, framecnt_t veclen) const
 {
-       gain_t old_master_val;
-       gain_t new_master_val;
-
-       {
-               Glib::Threads::Mutex::Lock lm (master_lock);
-               old_master_val = get_master_gain_locked ();
-               _masters.clear ();
-               new_master_val = get_master_gain_locked ();
+       if (_masters.empty()) {
+               return list()->curve().rt_safe_get_vector (start, end, vec, veclen);
        }
-
-       if (old_master_val != new_master_val) {
-               Changed(); /* EMIT SIGNAL */
+       for (framecnt_t i = 0; i < veclen; ++i) {
+               vec[i] = 1.f;
        }
+       return SlavableAutomationControl::masters_curve_multiply (start, end, vec, veclen);
 }