From f44cac5cc60c0ad93da3a44db2517f09cc82f345 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 29 Feb 2016 14:44:25 -0500
Subject: expand and improve VCA API

---
 libs/ardour/ardour/vca.h         |  8 ++++++-
 libs/ardour/ardour/vca_manager.h |  4 +++-
 libs/ardour/vca.cc               | 23 ++++++++++++++++++--
 libs/ardour/vca_manager.cc       | 45 +++++++++++++++++++++++++++++++++-------
 4 files changed, 68 insertions(+), 12 deletions(-)

diff --git a/libs/ardour/ardour/vca.h b/libs/ardour/ardour/vca.h
index 9a4ff0f602..a4e2e9f4df 100644
--- a/libs/ardour/ardour/vca.h
+++ b/libs/ardour/ardour/vca.h
@@ -33,9 +33,10 @@ class Route;
 
 class LIBARDOUR_API VCA : public SessionHandleRef {
   public:
-	VCA (Session& session, const std::string& name);
+	VCA (Session& session, const std::string& name, uint32_t num);
 
 	std::string name() const { return _name; }
+	uint32_t number () const { return _number; }
 
 	void set_value (double val, PBD::Controllable::GroupControlDisposition group_override);
 	double get_value () const;
@@ -45,9 +46,14 @@ class LIBARDOUR_API VCA : public SessionHandleRef {
 	void add (boost::shared_ptr<Route>);
 	void remove (boost::shared_ptr<Route>);
 
+	static std::string default_name_template ();
+	static int next_vca_number ();
   private:
+	uint32_t    _number;
 	std::string _name;
 	boost::shared_ptr<GainControl> _control;
+
+	static gint next_number;
 };
 
 } /* namespace */
diff --git a/libs/ardour/ardour/vca_manager.h b/libs/ardour/ardour/vca_manager.h
index 54cc14b572..764b966941 100644
--- a/libs/ardour/ardour/vca_manager.h
+++ b/libs/ardour/ardour/vca_manager.h
@@ -42,9 +42,11 @@ class VCAManager : public SessionHandleRef
 	VCAManager (ARDOUR::Session&);
 	~VCAManager ();
 
-	boost::shared_ptr<VCA> create_vca (std::string const & name = std::string());
+	int create_vca (uint32_t n, std::string const & name = std::string());
 	void remove_vca (boost::shared_ptr<VCA>);
 
+	boost::shared_ptr<VCA> vca_by_number(uint32_t) const;
+
 	typedef std::list<boost::shared_ptr<VCA> > VCAS;
 	VCAS vcas() const;
 
diff --git a/libs/ardour/vca.cc b/libs/ardour/vca.cc
index b49489dfe7..67ca4733cb 100644
--- a/libs/ardour/vca.cc
+++ b/libs/ardour/vca.cc
@@ -21,13 +21,31 @@
 #include "ardour/route.h"
 #include "ardour/vca.h"
 
+#include "i18n.h"
+
 using namespace ARDOUR;
 using namespace PBD;
 using std::string;
 
-VCA::VCA (Session& s, const string& n)
+gint VCA::next_number = 0;
+
+string
+VCA::default_name_template ()
+{
+	return _("VCA %n");
+}
+
+int
+VCA::next_vca_number ()
+{
+	/* recall that atomic_int_add() returns the value before the add */
+	return g_atomic_int_add (&next_number, 1) + 1;
+}
+
+VCA::VCA (Session& s, const string& name, uint32_t num)
 	: SessionHandleRef (s)
-	, _name (n)
+	, _number (num)
+	, _name (name)
 	, _control (new GainControl (s, Evoral::Parameter (GainAutomation), boost::shared_ptr<AutomationList> ()))
 {
 }
@@ -48,6 +66,7 @@ void
 VCA::add (boost::shared_ptr<Route> r)
 {
 	boost::dynamic_pointer_cast<GainControl>(r->gain_control())->add_master (_control);
+	std::cerr << name() << " now controlling " << r->name() << std::endl;
 }
 
 void
diff --git a/libs/ardour/vca_manager.cc b/libs/ardour/vca_manager.cc
index c5164982c3..476cd02bda 100644
--- a/libs/ardour/vca_manager.cc
+++ b/libs/ardour/vca_manager.cc
@@ -17,6 +17,9 @@
 
 */
 
+#include "pbd/convert.h"
+#include "pbd/replace_all.h"
+
 #include "ardour/vca.h"
 #include "ardour/vca_manager.h"
 
@@ -41,21 +44,34 @@ VCAManager::vcas () const
 	return _vcas;
 }
 
-boost::shared_ptr<VCA>
-VCAManager::create_vca (std::string const & name)
+int
+VCAManager::create_vca (uint32_t howmany, std::string const & name_template)
 {
-	boost::shared_ptr<VCA> vca = boost::shared_ptr<VCA> (new VCA (_session, name));
+	VCAList vcal;
+
 	{
 		Mutex::Lock lm (lock);
-		_vcas.push_back (vca);
-	}
 
-	VCAList vcal;
-	vcal.push_back (vca);
+		for (uint32_t n = 0; n < howmany; ++n) {
+
+			int num = VCA::next_vca_number ();
+			string name = name_template;
+
+			if (name.find ("%n")) {
+				string sn = PBD::to_string (n, std::dec);
+				replace_all (name, "%n", sn);
+			}
+
+			boost::shared_ptr<VCA> vca = boost::shared_ptr<VCA> (new VCA (_session, name, num));
+
+			_vcas.push_back (vca);
+			vcal.push_back (vca);
+		}
+	}
 
 	VCAAdded (vcal); /* EMIT SIGNAL */
-	return vca;
 
+	return 0;
 }
 
 
@@ -73,3 +89,16 @@ VCAManager::remove_vca (boost::shared_ptr<VCA> vca)
 	VCARemoved (vcal); /* EMIT SIGNAL */
 }
 
+boost::shared_ptr<VCA>
+VCAManager::vca_by_number (uint32_t n) const
+{
+	Mutex::Lock lm (lock);
+
+	for (VCAS::const_iterator i = _vcas.begin(); i != _vcas.end(); ++i) {
+		if ((*i)->number() == n) {
+			return *i;
+		}
+	}
+
+	return boost::shared_ptr<VCA>();
+}
-- 
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