add RMS region normalization option

3 files changed, 102 insertions, 31 deletions

diff --git a/gtk2_ardour/editor_ops.cc b/gtk2_ardour/editor_ops.cc
index c208e55165..2741f66d4d 100644
--- a/gtk2_ardour/editor_ops.cc
+++ b/gtk2_ardour/editor_ops.cc
@@ -5032,25 +5032,36 @@ Editor::normalize_region ()
 	   obtain the maximum amplitude of them all.
 	*/
 	list<double> max_amps;
+	list<double> rms_vals;
 	double max_amp = 0;
+	double max_rms = 0;
+	bool use_rms = dialog.constrain_rms ();
+
 	for (RegionSelection::const_iterator i = rs.begin(); i != rs.end(); ++i) {
 		AudioRegionView const * arv = dynamic_cast<AudioRegionView const *> (*i);
-		if (arv) {
-			dialog.descend (1.0 / regions);
-			double const a = arv->audio_region()->maximum_amplitude (&dialog);
-
-			if (a == -1) {
-				/* the user cancelled the operation */
-				return;
-			}
+		if (!arv) {
+			continue;
+		}
+		dialog.descend (1.0 / regions);
+		double const a = arv->audio_region()->maximum_amplitude (&dialog);
+		if (use_rms) {
+			double r = arv->audio_region()->rms (&dialog);
+			max_rms = max (max_rms, r);
+			rms_vals.push_back (r);
+		}
 
-			max_amps.push_back (a);
-			max_amp = max (max_amp, a);
-			dialog.ascend ();
+		if (a == -1) {
+			/* the user cancelled the operation */
+			return;
 		}
+
+		max_amps.push_back (a);
+		max_amp = max (max_amp, a);
+		dialog.ascend ();
 	}
 
 	list<double>::const_iterator a = max_amps.begin ();
+	list<double>::const_iterator l = rms_vals.begin ();
 	bool in_command = false;
 
 	for (RegionSelection::iterator r = rs.begin(); r != rs.end(); ++r) {
@@ -5061,9 +5072,21 @@ Editor::normalize_region ()
 
 		arv->region()->clear_changes ();
 
-		double const amp = dialog.normalize_individually() ? *a : max_amp;
+		double amp = dialog.normalize_individually() ? *a : max_amp;
+		double target = dialog.target_peak (); // dB
+
+		if (use_rms) {
+			double const amp_rms = dialog.normalize_individually() ? *l : max_rms;
+			const double t_rms = dialog.target_rms ();
+			const gain_t c_peak = dB_to_coefficient (target);
+			const gain_t c_rms  = dB_to_coefficient (t_rms);
+			if ((amp_rms / c_rms) > (amp / c_peak)) {
+				amp = amp_rms;
+				target = t_rms;
+			}
+		}
 
-		arv->audio_region()->normalize (amp, dialog.target ());
+		arv->audio_region()->normalize (amp, target);
 
 		if (!in_command) {
 			begin_reversible_command (_("normalize"));
@@ -5072,6 +5095,7 @@ Editor::normalize_region ()
 		_session->add_command (new StatefulDiffCommand (arv->region()));
 
 		++a;
+		++l;
 	}
 
 	if (in_command) {
diff --git a/gtk2_ardour/normalize_dialog.cc b/gtk2_ardour/normalize_dialog.cc
index 85b7b0bc29..929f11c54a 100644
--- a/gtk2_ardour/normalize_dialog.cc
+++ b/gtk2_ardour/normalize_dialog.cc
@@ -17,6 +17,7 @@
 
 */
 
+#include <gtkmm/table.h>
 #include <gtkmm/label.h>
 #include <gtkmm/spinbutton.h>
 #include <gtkmm/radiobutton.h>
@@ -28,7 +29,9 @@
 using namespace Gtk;
 
 double NormalizeDialog::_last_normalization_value = 0;
+double NormalizeDialog::_last_rms_target_value = -9;
 bool NormalizeDialog::_last_normalize_individually = true;
+bool NormalizeDialog::_last_constrain_rms = false;
 
 NormalizeDialog::NormalizeDialog (bool more_than_one)
 	: ArdourDialog (more_than_one ? _("Normalize regions") : _("Normalize region"))
@@ -36,18 +39,32 @@ NormalizeDialog::NormalizeDialog (bool more_than_one)
 {
 	get_vbox()->set_spacing (12);
 
-	HBox* hbox = manage (new HBox);
-	hbox->set_spacing (6);
-	hbox->set_border_width (6);
-	hbox->pack_start (*manage (new Label (_("Normalize to:"))), false, false);
-	_spin = manage (new SpinButton (0.2, 2));
-	_spin->set_range (-112, 0);
-	_spin->set_increments (0.1, 1);
-	_spin->set_value (_last_normalization_value);
-	_spin->set_activates_default ();
-	hbox->pack_start (*_spin, false, false);
-	hbox->pack_start (*manage (new Label (_("dBFS"))), false, false);
-	get_vbox()->pack_start (*hbox);
+	Table* tbl = manage (new Table);
+	tbl->set_spacings (6);
+	tbl->set_border_width (6);
+
+	_spin_peak = manage (new SpinButton (0.2, 2));
+	_spin_peak->set_range (-112, 0);
+	_spin_peak->set_increments (0.1, 1);
+	_spin_peak->set_value (_last_normalization_value);
+	_spin_peak->set_activates_default ();
+
+	_constrain_rms = manage (new CheckButton (_("Constrain RMS to:")));
+	_constrain_rms->set_active (_last_constrain_rms);
+	_spin_rms = manage (new SpinButton (0.2, 2));
+	_spin_rms->set_range (-112, 0);
+	_spin_rms->set_increments (0.1, 1);
+	_spin_rms->set_value (_last_rms_target_value);
+
+	tbl->attach (*manage (new Label (_("Normalize to:"), ALIGN_END)), 0, 1, 0, 1, FILL, SHRINK);
+	tbl->attach (*_spin_peak, 1, 2, 0, 1, SHRINK, SHRINK);
+	tbl->attach (*manage (new Label (_("dBFS"))), 2, 3, 0, 1, SHRINK, SHRINK);
+
+	tbl->attach (*_constrain_rms, 0, 1, 1, 2, SHRINK, SHRINK);
+	tbl->attach (*_spin_rms, 1, 2, 1, 2, SHRINK, SHRINK);
+	tbl->attach (*manage (new Label (_("dBFS"))), 2, 3, 1, 2, SHRINK, SHRINK);
+
+	get_vbox()->pack_start (*tbl);
 
 	if (more_than_one) {
 		RadioButtonGroup group;
@@ -67,15 +84,24 @@ NormalizeDialog::NormalizeDialog (bool more_than_one)
 	_progress_bar = manage (new ProgressBar);
 	get_vbox()->pack_start (*_progress_bar);
 
+	update_sensitivity ();
 	show_all ();
+	_progress_bar->hide ();
 
 	add_button (Stock::CANCEL, RESPONSE_CANCEL);
 	add_button (_("Normalize"), RESPONSE_ACCEPT);
 	set_default_response (RESPONSE_ACCEPT);
 
+	_constrain_rms->signal_toggled ().connect (sigc::mem_fun (*this, &NormalizeDialog::update_sensitivity));
 	signal_response().connect (sigc::mem_fun (*this, &NormalizeDialog::button_clicked));
 }
 
+void
+NormalizeDialog::update_sensitivity ()
+{
+	_spin_rms->set_sensitive (constrain_rms ());
+}
+
 bool
 NormalizeDialog::normalize_individually () const
 {
@@ -86,10 +112,22 @@ NormalizeDialog::normalize_individually () const
 	return _normalize_individually->get_active ();
 }
 
+bool
+NormalizeDialog::constrain_rms () const
+{
+	return _constrain_rms->get_active ();
+}
+
 double
-NormalizeDialog::target () const
+NormalizeDialog::target_peak () const
 {
-	return _spin->get_value ();
+	return _spin_peak->get_value ();
+}
+
+double
+NormalizeDialog::target_rms () const
+{
+	return _spin_rms->get_value ();
 }
 
 void
@@ -98,7 +136,7 @@ NormalizeDialog::update_progress_gui (float p)
 	/* Normalization is run inside the GUI thread, so we can directly
 	 * update the progress bar when notified about progress.
 	 */
-
+	_progress_bar->show ();
 	_progress_bar->set_fraction (p);
 }
 
@@ -106,7 +144,9 @@ int
 NormalizeDialog::run ()
 {
 	int const r = ArdourDialog::run ();
-	_last_normalization_value = target ();
+	_last_normalization_value = target_peak ();
+	_last_rms_target_value = target_rms ();
+	_last_constrain_rms = constrain_rms ();
 	if (_normalize_individually) {
 		_last_normalize_individually = _normalize_individually->get_active ();
 	}
diff --git a/gtk2_ardour/normalize_dialog.h b/gtk2_ardour/normalize_dialog.h
index 71ca030416..53b9e71b37 100644
--- a/gtk2_ardour/normalize_dialog.h
+++ b/gtk2_ardour/normalize_dialog.h
@@ -32,17 +32,24 @@ public:
 	NormalizeDialog (bool);
 
 	bool normalize_individually () const;
-	double target () const;
+	bool constrain_rms () const;
+	double target_peak () const;
+	double target_rms () const;
 	int run ();
 
 private:
 	void update_progress_gui (float);
 	void button_clicked (int);
+	void update_sensitivity ();
 
 	Gtk::RadioButton* _normalize_individually;
-	Gtk::SpinButton* _spin;
+	Gtk::CheckButton* _constrain_rms;
+	Gtk::SpinButton*  _spin_peak;
+	Gtk::SpinButton*  _spin_rms;
 	Gtk::ProgressBar* _progress_bar;
 
 	static double _last_normalization_value;
+	static double _last_rms_target_value;
 	static bool _last_normalize_individually;
+	static bool _last_constrain_rms;
 };