when a session goes away, deliver silence to all current ports to prevent a horrible screech during cleanup/destruction

git-svn-id: svn://localhost/ardour2/branches/3.0@12806 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 17 insertions, 8 deletions

diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 0f318a1b75..26f8311c8d 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -475,21 +475,30 @@ AudioEngine::process_callback (pframes_t nframes)
 		return 0;
 	}
 
+	if (session_remove_pending) {
+		/* perform the actual session removal */
+		_session = 0;
+		session_remove_pending = false;
+		session_removed.signal();
+	}
+
 	if (_session == 0) {
 		if (!_freewheeling) {
 			MIDI::Manager::instance()->cycle_start(nframes);
 			MIDI::Manager::instance()->cycle_end();
+
+			boost::shared_ptr<Ports> p = ports.reader();
+			
+			for (Ports::iterator i = p->begin(); i != p->end(); ++i) {
+				
+				if (i->second->sends_output()) {
+					i->second->get_buffer (nframes).silence (nframes);
+				}
+			}
 		}
-		_processed_frames = next_processed_frames;
-		return 0;
-	}
 
-	if (session_remove_pending) {
-		/* perform the actual session removal */
-		_session = 0;
-		session_remove_pending = false;
-		session_removed.signal();
 		_processed_frames = next_processed_frames;
+
 		return 0;
 	}