add StartTouch and EndTouch signals to Plugin class; make PluginInsert handle these signals and mark the start end of touch/gestures for a given AutomationControl; net result is that touch automation now works for AudioUnit plugins, at least those whose GUIs send kAudioUnitEvent_{Begin,End}ParameterGesture events

git-svn-id: svn://localhost/ardour2/branches/3.0@13028 d708f5d6-7413-0410-9779-e7cbd77b26cf

4 files changed, 79 insertions, 5 deletions

diff --git a/libs/ardour/ardour/plugin.h b/libs/ardour/ardour/plugin.h
index bf91de903b..9e4f5c40fd 100644
--- a/libs/ardour/ardour/plugin.h
+++ b/libs/ardour/ardour/plugin.h
@@ -255,6 +255,9 @@ class Plugin : public PBD::StatefulDestructible, public Latent
 	void set_cycles (uint32_t c) { _cycles = c; }
 	cycles_t cycles() const { return _cycles; }
 
+        PBD::Signal1<void,uint32_t> StartTouch;
+        PBD::Signal1<void,uint32_t> EndTouch;
+
 protected:
 
 	friend class PluginInsert;
diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index 0146604327..69bf7eadb5 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -138,6 +138,9 @@ class PluginInsert : public Processor
 		Hide,        ///< we `hide' some of the plugin's inputs by feeding them silence
 	};
 
+        PBD::Signal1<void,uint32_t> StartTouch;
+        PBD::Signal1<void,uint32_t> EndTouch;
+	
   private:
 	/* disallow copy construction */
 	PluginInsert (const PluginInsert&);
@@ -185,6 +188,9 @@ class PluginInsert : public Processor
 
 	boost::shared_ptr<Plugin> plugin_factory (boost::shared_ptr<Plugin>);
 	void add_plugin (boost::shared_ptr<Plugin>);
+
+        void start_touch (uint32_t param_id);
+        void end_touch (uint32_t param_id);
 };
 
 } // namespace ARDOUR
diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc
index a76bcc4aae..431fb99a48 100644
--- a/libs/ardour/audio_unit.cc
+++ b/libs/ardour/audio_unit.cc
@@ -2753,6 +2753,26 @@ AUPlugin::listen_to_parameter (uint32_t param_id)
 		return -1;
 	} 
 
+	event.mEventType = kAudioUnitEvent_BeginParameterChangeGesture;
+	event.mArgument.mParameter.mAudioUnit = unit->AU();
+	event.mArgument.mParameter.mParameterID = descriptors[param_id].id;
+	event.mArgument.mParameter.mScope = descriptors[param_id].scope;
+	event.mArgument.mParameter.mElement = descriptors[param_id].element;
+
+	if (AUEventListenerAddEventType (_parameter_listener, _parameter_listener_arg, &event) != noErr) {
+		return -1;
+	} 
+
+	event.mEventType = kAudioUnitEvent_EndParameterChangeGesture;
+	event.mArgument.mParameter.mAudioUnit = unit->AU();
+	event.mArgument.mParameter.mParameterID = descriptors[param_id].id;
+	event.mArgument.mParameter.mScope = descriptors[param_id].scope;
+	event.mArgument.mParameter.mElement = descriptors[param_id].element;
+
+	if (AUEventListenerAddEventType (_parameter_listener, _parameter_listener_arg, &event) != noErr) {
+		return -1;
+	} 
+
 	return 0;
 }
 
@@ -2775,6 +2795,26 @@ AUPlugin::end_listen_to_parameter (uint32_t param_id)
 		return -1;
 	} 
 
+	event.mEventType = kAudioUnitEvent_BeginParameterChangeGesture;
+	event.mArgument.mParameter.mAudioUnit = unit->AU();
+	event.mArgument.mParameter.mParameterID = descriptors[param_id].id;
+	event.mArgument.mParameter.mScope = descriptors[param_id].scope;
+	event.mArgument.mParameter.mElement = descriptors[param_id].element;
+
+	if (AUEventListenerRemoveEventType (_parameter_listener, _parameter_listener_arg, &event) != noErr) {
+		return -1;
+	} 
+
+	event.mEventType = kAudioUnitEvent_EndParameterChangeGesture;
+	event.mArgument.mParameter.mAudioUnit = unit->AU();
+	event.mArgument.mParameter.mParameterID = descriptors[param_id].id;
+	event.mArgument.mParameter.mScope = descriptors[param_id].scope;
+	event.mArgument.mParameter.mElement = descriptors[param_id].element;
+
+	if (AUEventListenerRemoveEventType (_parameter_listener, _parameter_listener_arg, &event) != noErr) {
+		return -1;
+	} 
+
 	return 0;
 }
 
@@ -2789,17 +2829,19 @@ AUPlugin::parameter_change_listener (void* /*arg*/, void* /*src*/, const AudioUn
 {
         ParameterMap::iterator i;
 
+        if ((i = parameter_map.find (event->mArgument.mParameter.mParameterID)) == parameter_map.end()) {
+                return;
+        }
+        
         switch (event->mEventType) {
         case kAudioUnitEvent_BeginParameterChangeGesture:
+                StartTouch (i->second);
                 break;
         case kAudioUnitEvent_EndParameterChangeGesture:
+                EndTouch (i->second);
                 break;
         case kAudioUnitEvent_ParameterValueChange:
-                i = parameter_map.find (event->mArgument.mParameter.mParameterID);
-
-                if (i != parameter_map.end()) {
-                        ParameterChanged (i->second, new_value);
-                }
+                ParameterChanged (i->second, new_value);
                 break;
         default:
                 break;
diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index baaa632d2b..6e7cfe373f 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -1263,7 +1263,12 @@ PluginInsert::add_plugin (boost::shared_ptr<Plugin> plugin)
 	plugin->set_insert_info (this);
 	
 	if (_plugins.empty()) {
+                /* first (and probably only) plugin instance - connect to relevant signals 
+                 */
+
 		plugin->ParameterChanged.connect_same_thread (*this, boost::bind (&PluginInsert::parameter_changed, this, _1, _2));
+                plugin->StartTouch.connect_same_thread (*this, boost::bind (&PluginInsert::start_touch, this, _1));
+                plugin->EndTouch.connect_same_thread (*this, boost::bind (&PluginInsert::end_touch, this, _1));
 	}
 
 	_plugins.push_back (plugin);
@@ -1292,3 +1297,21 @@ PluginInsert::monitoring_changed ()
 		(*i)->monitoring_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());
+        }
+}
+
+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());
+        }
+}