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

1 files changed, 47 insertions, 5 deletions

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;