Add API allowing plugin preset load to affect automation

3 files changed, 34 insertions, 8 deletions

diff --git a/libs/ardour/ardour/plugin.h b/libs/ardour/ardour/plugin.h
index 56d19a0cb4..e4efb2a441 100644
--- a/libs/ardour/ardour/plugin.h
+++ b/libs/ardour/ardour/plugin.h
@@ -256,6 +256,9 @@ class LIBARDOUR_API Plugin : public PBD::StatefulDestructible, public Latent
 	 */
 	PBD::Signal0<void> PresetDirty;
 
+	/** Emitted for preset-load to set a control-port */
+	PBD::Signal2<void, uint32_t, float> PresetPortSetValue;
+
 	virtual bool has_editor () const = 0;
 
 	/** Emitted when a parameter is altered by something outside of our
diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index 0f533d9200..2b8d1bc542 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -374,6 +374,8 @@ class LIBARDOUR_API PluginInsert : public Processor
 	void latency_changed ();
 	bool _latency_changed;
 	uint32_t _bypass_port;
+
+	void preset_load_set_value (uint32_t, float);
 };
 
 } // namespace ARDOUR
diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index bf97a1217e..daae15d3ad 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -490,7 +490,9 @@ PluginInsert::create_automatable_parameters ()
 			ac->Changed.connect_same_thread (*this, boost::bind (&PluginInsert::enable_changed, this));
 		}
 	}
+	plugin->PresetPortSetValue.connect_same_thread (*this, boost::bind (&PluginInsert::preset_load_set_value, this, _1, _2));
 }
+
 /** Called when something outside of this host has modified a plugin
  * parameter. Responsible for propagating the change to two places:
  *
@@ -650,6 +652,23 @@ PluginInsert::bypassable_changed ()
 }
 
 void
+PluginInsert::preset_load_set_value (uint32_t p, float v)
+{
+	boost::shared_ptr<AutomationControl> ac = automation_control (Evoral::Parameter(PluginAutomation, 0, p));
+	if (!ac) {
+		return;
+	}
+
+	if (ac->automation_state() & Play) {
+		return;
+	}
+
+	start_touch (p);
+	ac->set_value (v, Controllable::NoGroup);
+	end_touch (p);
+}
+
+void
 PluginInsert::inplace_silence_unconnected (BufferSet& bufs, const PinMappings& out_map, framecnt_t nframes, framecnt_t offset) const
 {
 	// TODO optimize: store "unconnected" in a fixed set.
@@ -3014,19 +3033,21 @@ PluginInsert::latency_changed ()
 void
 PluginInsert::start_touch (uint32_t param_id)
 {
-        boost::shared_ptr<AutomationControl> ac = automation_control (Evoral::Parameter (PluginAutomation, 0, param_id));
-        if (ac) {
-                ac->start_touch (session().audible_frame());
-        }
+	boost::shared_ptr<AutomationControl> ac = automation_control (Evoral::Parameter (PluginAutomation, 0, param_id));
+	if (ac) {
+		// ToDo subtract _plugin_signal_latency  from audible_frame() when rolling, assert > 0
+		ac->start_touch (session().audible_frame());
+	}
 }
 
 void
 PluginInsert::end_touch (uint32_t param_id)
 {
-        boost::shared_ptr<AutomationControl> ac = automation_control (Evoral::Parameter (PluginAutomation, 0, param_id));
-        if (ac) {
-                ac->stop_touch (true, session().audible_frame());
-        }
+	boost::shared_ptr<AutomationControl> ac = automation_control (Evoral::Parameter (PluginAutomation, 0, param_id));
+	if (ac) {
+		// ToDo subtract _plugin_signal_latency  from audible_frame() when rolling, assert > 0
+		ac->stop_touch (true, session().audible_frame());
+	}
 }
 
 std::ostream& operator<<(std::ostream& o, const ARDOUR::PluginInsert::Match& m)