add API to use a plugin provided bypass control port

* new separate API: en/disable
* old API remains in place for hard bypass
* PluginInsert::enable() falls back to activate/deativate if a plugin
  does not provided designated bypass control port

3 files changed, 16 insertions, 1 deletions

diff --git a/libs/ardour/ardour/plugin.h b/libs/ardour/ardour/plugin.h
index 935b75faea..dcb6577e7a 100644
--- a/libs/ardour/ardour/plugin.h
+++ b/libs/ardour/ardour/plugin.h
@@ -113,6 +113,8 @@ class LIBARDOUR_API Plugin : public PBD::StatefulDestructible, public Latent
 	virtual bool parameter_is_input(uint32_t) const = 0;
 	virtual bool parameter_is_output(uint32_t) const = 0;
 
+	virtual uint32_t designated_bypass_port () { return UINT32_MAX; }
+
 	struct LIBARDOUR_API IOPortDescription {
 		public:
 		IOPortDescription (const std::string& n)
diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index 9f1d56b811..6f7b10cd46 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -68,6 +68,10 @@ class LIBARDOUR_API PluginInsert : public Processor
 	void deactivate ();
 	void flush ();
 
+	void enable (bool yn);
+	bool enabled () const;
+	bool bypassable () const;
+
 	bool reset_parameters_to_default ();
 	bool can_reset_all_parameters ();
 
@@ -355,6 +359,9 @@ class LIBARDOUR_API PluginInsert : public Processor
 	void set_parameter_state_2X (const XMLNode& node, int version);
 	void set_control_ids (const XMLNode&, int version);
 
+	void enable_changed ();
+	void bypassable_changed ();
+
 	boost::shared_ptr<Plugin> plugin_factory (boost::shared_ptr<Plugin>);
 	void add_plugin (boost::shared_ptr<Plugin>);
 
@@ -363,6 +370,7 @@ class LIBARDOUR_API PluginInsert : public Processor
 
 	void latency_changed (framecnt_t, framecnt_t);
 	bool _latency_changed;
+	uint32_t _bypass_port;
 };
 
 } // namespace ARDOUR
diff --git a/libs/ardour/ardour/processor.h b/libs/ardour/ardour/processor.h
index c86827c13b..1a4863ff2d 100644
--- a/libs/ardour/ardour/processor.h
+++ b/libs/ardour/ardour/processor.h
@@ -59,7 +59,9 @@ class LIBARDOUR_API Processor : public SessionObject, public Automatable, public
 	virtual bool display_to_user() const { return _display_to_user; }
 	virtual void set_display_to_user (bool);
 
-	bool active () const { return _pending_active; }
+	bool active () const { return _pending_active; } ///< ardour hard bypass
+	virtual bool enabled () const { return _pending_active; } ///< processor enabled/bypass
+	virtual bool bypassable () const { return true; } ///< enable is not automated or locked
 
 	virtual bool does_routing() const { return false; }
 
@@ -81,6 +83,8 @@ class LIBARDOUR_API Processor : public SessionObject, public Automatable, public
 	virtual void deactivate () { _pending_active = false; ActiveChanged(); }
 	virtual void flush() {}
 
+	virtual void enable (bool yn) { if (yn) { activate (); } else { deactivate (); } }
+
 	virtual bool configure_io (ChanCount in, ChanCount out);
 
 	/* Derived classes should override these, or processor appears as an in-place pass-through */
@@ -111,6 +115,7 @@ class LIBARDOUR_API Processor : public SessionObject, public Automatable, public
 	virtual void set_pre_fader (bool);
 
 	PBD::Signal0<void>                     ActiveChanged;
+	PBD::Signal0<void>                     BypassableChanged;
 	PBD::Signal2<void,ChanCount,ChanCount> ConfigurationChanged;
 
 	void  set_ui (void*);