From 31b2c7858124a382a59e381dc1b46212be15e046 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 6 Apr 2016 04:59:28 +0200
Subject: update processor in-place mode when pin-mapping changes

---
 libs/ardour/ardour/plugin_insert.h |  2 ++
 libs/ardour/plugin_insert.cc       | 40 +++++++++++++++++++++++++++-----------
 2 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/libs/ardour/ardour/plugin_insert.h b/libs/ardour/ardour/plugin_insert.h
index 26177ebf95..0053f714dc 100644
--- a/libs/ardour/ardour/plugin_insert.h
+++ b/libs/ardour/ardour/plugin_insert.h
@@ -100,6 +100,7 @@ class LIBARDOUR_API PluginInsert : public Processor
 	void set_output_map (uint32_t, ChanMapping);
 	bool reset_map (bool emit = true);
 	bool sanitize_maps ();
+	bool check_inplace ();
 
 	// these are ports visible on the outside
 	ChanCount output_streams() const;
@@ -300,6 +301,7 @@ class LIBARDOUR_API PluginInsert : public Processor
 	bool _strict_io;
 	bool _custom_cfg;
 	bool _maps_from_state;
+	bool _mapping_changed;
 
 	Match private_can_support_io_configuration (ChanCount const &, ChanCount &) const;
 	Match automatic_can_support_io_configuration (ChanCount const &, ChanCount &) const;
diff --git a/libs/ardour/plugin_insert.cc b/libs/ardour/plugin_insert.cc
index eebd07a2c5..cdf1e600a8 100644
--- a/libs/ardour/plugin_insert.cc
+++ b/libs/ardour/plugin_insert.cc
@@ -468,8 +468,13 @@ PluginInsert::flush ()
 void
 PluginInsert::connect_and_run (BufferSet& bufs, pframes_t nframes, framecnt_t offset, bool with_auto, framepos_t now)
 {
+	// TODO: atomically copy maps & _no_inplace
 	PinMappings in_map (_in_map);
 	PinMappings out_map (_out_map);
+	if (_mapping_changed) {
+		_no_inplace = check_inplace ();
+		_mapping_changed = false;
+	}
 
 #if 1
 	// TODO optimize special case.
@@ -948,6 +953,7 @@ PluginInsert::set_input_map (uint32_t num, ChanMapping m) {
 		sanitize_maps ();
 		if (changed) {
 			PluginMapChanged (); /* EMIT SIGNAL */
+			_mapping_changed = true;
 		}
 	}
 }
@@ -960,6 +966,7 @@ PluginInsert::set_output_map (uint32_t num, ChanMapping m) {
 		sanitize_maps ();
 		if (changed) {
 			PluginMapChanged (); /* EMIT SIGNAL */
+			_mapping_changed = true;
 		}
 	}
 }
@@ -1029,6 +1036,24 @@ PluginInsert::is_channelstrip () const {
 }
 #endif
 
+bool
+PluginInsert::check_inplace ()
+{
+	// auto-detect if inplace processing is possible
+	bool inplace_ok = true;
+	for (uint32_t pc = 0; pc < get_count() && inplace_ok ; ++pc) {
+		if (!_in_map[pc].is_monotonic ()) {
+			inplace_ok = false;
+		}
+		if (!_out_map[pc].is_monotonic ()) {
+			inplace_ok = false;
+		}
+	}
+	bool no_inplace = !inplace_ok || _plugins.front()->inplace_broken ();
+	DEBUG_TRACE (DEBUG::ChanMapping, string_compose ("%1 %2\n", name(), no_inplace ? "No Inplace Processing" : "In-Place"));
+	return no_inplace;
+}
+
 bool
 PluginInsert::sanitize_maps ()
 {
@@ -1137,6 +1162,7 @@ PluginInsert::reset_map (bool emit)
 	}
 	if (emit) {
 		PluginMapChanged (); /* EMIT SIGNAL */
+		_mapping_changed = true;
 	}
 	return true;
 }
@@ -1276,17 +1302,9 @@ PluginInsert::configure_io (ChanCount in, ChanCount out)
 #endif
 	}
 
-	// auto-detect if inplace processing is possible
-	bool inplace_ok = true;
-	for (uint32_t pc = 0; pc < get_count() && inplace_ok ; ++pc) {
-		if (!_in_map[pc].is_monotonic ()) {
-			inplace_ok = false;
-		}
-		if (!_out_map[pc].is_monotonic ()) {
-			inplace_ok = false;
-		}
-	}
-	_no_inplace = !inplace_ok || _plugins.front()->inplace_broken ();
+	_no_inplace = check_inplace ();
+	_mapping_changed = false;
+	DEBUG_TRACE (DEBUG::ChanMapping, string_compose ("%1 %2\n", name(), _no_inplace ? "No Inplace Processing" : "In-Place"));
 
 	if (old_in != in || old_out != out || old_internal != _configured_internal
 			|| (old_match.method != _match.method && (old_match.method == Split || _match.method == Split))
-- 
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