X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fardour%2Fsession.cc;h=edae568645e8e92634b445eb054a7567b76952e7;hb=f269e39115934c8e48dbc66e495d8cfdba1e70f0;hp=1c7410002dde717c38c9bf4dbf74d62ded86af1b;hpb=435dd4e98fea73025e0b0f788a08a39c99c6d1f6;p=ardour.git

diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 1c7410002d..edae568645 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -71,7 +71,9 @@
 #include "ardour/engine_state_controller.h"
 #endif
 #include "ardour/filename_extensions.h"
+#include "ardour/gain_control.h"
 #include "ardour/graph.h"
+#include "ardour/luabindings.h"
 #include "ardour/midiport_manager.h"
 #include "ardour/scene_changer.h"
 #include "ardour/midi_patch_manager.h"
@@ -105,6 +107,8 @@
 #include "midi++/port.h"
 #include "midi++/mmc.h"
 
+#include "LuaBridge/LuaBridge.h"
+
 #include "i18n.h"
 
 #include <glibmm/checksum.h>
@@ -183,6 +187,7 @@ Session::Session (AudioEngine &eng,
 	, _worst_track_latency (0)
 	, _have_captured (false)
 	, _non_soloed_outs_muted (false)
+	, _listening (false)
 	, _listen_cnt (0)
 	, _solo_isolated_cnt (0)
 	, _writable (false)
@@ -199,8 +204,8 @@ Session::Session (AudioEngine &eng,
 	, post_export_sync (false)
 	, post_export_position (0)
 	, _exporting (false)
-	, _export_started (false)
 	, _export_rolling (false)
+	, _export_preroll (0)
 	, _pre_export_mmc_enabled (false)
 	, _name (snapshot_name)
 	, _is_new (true)
@@ -225,6 +230,9 @@ Session::Session (AudioEngine &eng,
 	, pending_locate_flush (false)
 	, pending_abort (false)
 	, pending_auto_loop (false)
+	, _mempool ("Session", 1048576)
+	, lua (lua_newstate (&PBD::ReallocPool::lalloc, &_mempool))
+	, _n_lua_scripts (0)
 	, _butler (new Butler (*this))
 	, _post_transport_work (0)
 	,  cumulative_rf_motion (0)
@@ -305,6 +313,8 @@ Session::Session (AudioEngine &eng,
 
 	pre_engine_init (fullpath);
 
+	setup_lua ();
+
 	if (_is_new) {
 
 		Stateful::loading_state_version = CURRENT_SESSION_FILE_VERSION;
@@ -588,8 +598,19 @@ Session::destroy ()
 	delete state_tree;
 	state_tree = 0;
 
-	/* reset dynamic state version back to default */
+	// unregister all lua functions, drop held references (if any)
+	(*_lua_cleanup)();
+	lua.do_command ("Session = nil");
+	delete _lua_run;
+	delete _lua_add;
+	delete _lua_del;
+	delete _lua_list;
+	delete _lua_save;
+	delete _lua_load;
+	delete _lua_cleanup;
+	lua.collect_garbage ();
 
+	/* reset dynamic state version back to default */
 	Stateful::loading_state_version = 0;
 
 	_butler->drop_references ();
@@ -732,8 +753,12 @@ void
 Session::setup_click ()
 {
 	_clicking = false;
+
+	boost::shared_ptr<AutomationList> gl (new AutomationList (Evoral::Parameter (GainAutomation)));
+	boost::shared_ptr<GainControl> gain_control = boost::shared_ptr<GainControl> (new GainControl (*this, Evoral::Parameter(GainAutomation), gl));
+
 	_click_io.reset (new ClickIO (*this, X_("Click")));
-	_click_gain.reset (new Amp (*this));
+	_click_gain.reset (new Amp (*this, _("Fader"), gain_control, true));
 	_click_gain->activate ();
 	if (state_tree) {
 		setup_click_state (state_tree->root());
@@ -1022,6 +1047,7 @@ Session::remove_monitor_section ()
 	if (auditioner) {
 		auditioner->connect ();
 	}
+	Config->ParameterChanged ("use-monitor-bus");
 }
 
 void
@@ -1173,6 +1199,7 @@ Session::add_monitor_section ()
 	if (auditioner) {
 		auditioner->connect ();
 	}
+	Config->ParameterChanged ("use-monitor-bus");
 }
 
 void
@@ -1824,6 +1851,19 @@ Session::enable_record ()
 	}
 }
 
+void
+Session::set_all_tracks_record_enabled (bool enable )
+{
+	boost::shared_ptr<RouteList> rl = routes.reader();
+	for (RouteList::iterator i = rl->begin(); i != rl->end(); ++i) {
+		boost::shared_ptr<Track> tr = boost::dynamic_pointer_cast<Track> (*i);
+		if (tr) {
+			tr->set_record_enabled (enable, Controllable::NoGroup);
+		}
+	}
+}
+
+
 void
 Session::disable_record (bool rt_context, bool force)
 {
@@ -2395,6 +2435,92 @@ Session::new_midi_track (const ChanCount& input, const ChanCount& output, boost:
 	return ret;
 }
 
+RouteList
+Session::new_midi_route (RouteGroup* route_group, uint32_t how_many, string name_template, boost::shared_ptr<PluginInfo> instrument)
+{
+	string bus_name;
+	uint32_t bus_id = 0;
+	string port;
+	RouteList ret;
+
+	bool const use_number = (how_many != 1) || name_template.empty () || name_template == _("Midi Bus");
+
+	while (how_many) {
+		if (!find_route_name (name_template.empty () ? _("Midi Bus") : name_template, ++bus_id, bus_name, use_number)) {
+			error << "cannot find name for new midi bus" << endmsg;
+			goto failure;
+		}
+
+		try {
+			boost::shared_ptr<Route> bus (new Route (*this, bus_name, Route::Flag(0), DataType::AUDIO)); // XXX Editor::add_routes is not ready for ARDOUR::DataType::MIDI
+
+			if (bus->init ()) {
+				goto failure;
+			}
+
+#ifdef BOOST_SP_ENABLE_DEBUG_HOOKS
+			// boost_debug_shared_ptr_mark_interesting (bus.get(), "Route");
+#endif
+			{
+				Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
+
+				if (bus->input()->ensure_io (ChanCount(DataType::MIDI, 1), false, this)) {
+					error << _("cannot configure new midi bus input") << endmsg;
+					goto failure;
+				}
+
+
+				if (bus->output()->ensure_io (ChanCount(DataType::MIDI, 1), false, this)) {
+					error << _("cannot configure new midi bus output") << endmsg;
+					goto failure;
+				}
+			}
+
+			if (route_group) {
+				route_group->add (bus);
+			}
+			if (Config->get_remote_model() == UserOrdered) {
+				bus->set_remote_control_id (next_control_id());
+			}
+
+			ret.push_back (bus);
+			RouteAddedOrRemoved (true); /* EMIT SIGNAL */
+			ARDOUR::GUIIdle ();
+		}
+
+		catch (failed_constructor &err) {
+			error << _("Session: could not create new audio route.") << endmsg;
+			goto failure;
+		}
+
+		catch (AudioEngine::PortRegistrationFailure& pfe) {
+			error << pfe.what() << endmsg;
+			goto failure;
+		}
+
+
+		--how_many;
+	}
+
+  failure:
+	if (!ret.empty()) {
+		StateProtector sp (this);
+		add_routes (ret, false, false, false);
+
+		if (instrument) {
+			for (RouteList::iterator r = ret.begin(); r != ret.end(); ++r) {
+				PluginPtr plugin = instrument->load (*this);
+				boost::shared_ptr<Processor> p (new PluginInsert (*this, plugin));
+				(*r)->add_processor (p, PreFader);
+			}
+		}
+	}
+
+	return ret;
+
+}
+
+
 void
 Session::midi_output_change_handler (IOChange change, void * /*src*/, boost::weak_ptr<Route> wmt)
 {
@@ -2872,7 +2998,7 @@ Session::new_audio_track (int input_channels, int output_channels, TrackMode mod
 				//  0 for Stereo Out mode
 				//  0 Multi Out mode
 				if (Config->get_output_auto_connect() & AutoConnectMaster) {
-					track->set_gain (dB_to_coefficient (0), 0);
+					track->set_gain (dB_to_coefficient (0), Controllable::NoGroup);
 				}
 			}
 
@@ -3260,10 +3386,10 @@ Session::add_routes_inner (RouteList& new_routes, bool input_auto_connect, bool
 		boost::weak_ptr<Route> wpr (*x);
 		boost::shared_ptr<Route> r (*x);
 
-		r->listen_changed.connect_same_thread (*this, boost::bind (&Session::route_listen_changed, this, _2, wpr));
-		r->solo_changed.connect_same_thread (*this, boost::bind (&Session::route_solo_changed, this, _1, _3, wpr));
-		r->solo_isolated_changed.connect_same_thread (*this, boost::bind (&Session::route_solo_isolated_changed, this, _1, wpr));
-		r->mute_changed.connect_same_thread (*this, boost::bind (&Session::route_mute_changed, this, _1));
+		r->listen_changed.connect_same_thread (*this, boost::bind (&Session::route_listen_changed, this, _1, wpr));
+		r->solo_changed.connect_same_thread (*this, boost::bind (&Session::route_solo_changed, this, _1, _2, wpr));
+		r->solo_isolated_changed.connect_same_thread (*this, boost::bind (&Session::route_solo_isolated_changed, this, wpr));
+		r->mute_changed.connect_same_thread (*this, boost::bind (&Session::route_mute_changed, this));
 		r->output()->changed.connect_same_thread (*this, boost::bind (&Session::set_worst_io_latencies_x, this, _1, _2));
 		r->processors_changed.connect_same_thread (*this, boost::bind (&Session::route_processors_changed, this, _1));
 
@@ -3335,7 +3461,7 @@ Session::globally_set_send_gains_to_zero (boost::shared_ptr<Route> dest)
 
 	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 		if ((s = (*i)->internal_send_for (dest)) != 0) {
-			s->amp()->gain_control()->set_value (GAIN_COEFF_ZERO);
+			s->amp()->gain_control()->set_value (GAIN_COEFF_ZERO, Controllable::NoGroup);
 		}
 	}
 }
@@ -3348,7 +3474,7 @@ Session::globally_set_send_gains_to_unity (boost::shared_ptr<Route> dest)
 
 	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 		if ((s = (*i)->internal_send_for (dest)) != 0) {
-			s->amp()->gain_control()->set_value (GAIN_COEFF_UNITY);
+			s->amp()->gain_control()->set_value (GAIN_COEFF_UNITY, Controllable::NoGroup);
 		}
 	}
 }
@@ -3361,7 +3487,7 @@ Session::globally_set_send_gains_from_track(boost::shared_ptr<Route> dest)
 
 	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
 		if ((s = (*i)->internal_send_for (dest)) != 0) {
-			s->amp()->gain_control()->set_value ((*i)->gain_control()->get_value());
+			s->amp()->gain_control()->set_value ((*i)->gain_control()->get_value(), Controllable::NoGroup);
 		}
 	}
 }
@@ -3429,7 +3555,7 @@ Session::remove_routes (boost::shared_ptr<RouteList> routes_to_remove)
 				continue;
 			}
 
-			(*iter)->set_solo (false, this);
+			(*iter)->set_solo (false, Controllable::NoGroup);
 
 			rs->remove (*iter);
 
@@ -3537,13 +3663,13 @@ Session::remove_route (boost::shared_ptr<Route> route)
 }
 
 void
-Session::route_mute_changed (void* /*src*/)
+Session::route_mute_changed ()
 {
 	set_dirty ();
 }
 
 void
-Session::route_listen_changed (bool group_override, boost::weak_ptr<Route> wpr)
+Session::route_listen_changed (Controllable::GroupControlDisposition group_override, boost::weak_ptr<Route> wpr)
 {
 	boost::shared_ptr<Route> route = wpr.lock();
 	if (!route) {
@@ -3554,18 +3680,32 @@ Session::route_listen_changed (bool group_override, boost::weak_ptr<Route> wpr)
 	if (route->listening_via_monitor ()) {
 
 		if (Config->get_exclusive_solo()) {
-			/* new listen: disable all other listen, except solo-grouped channels */
+
 			RouteGroup* rg = route->route_group ();
-			bool leave_group_alone = (rg && rg->is_active() && rg->is_solo());
-			if (group_override && rg) {
-				leave_group_alone = !leave_group_alone;
-			}
+			const bool group_already_accounted_for = route->use_group (group_override, &RouteGroup::is_solo);
+
 			boost::shared_ptr<RouteList> r = routes.reader ();
+
 			for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-				if ((*i) == route || (*i)->solo_isolated() || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_auditioner() || (leave_group_alone && ((*i)->route_group() == rg))) {
+				if ((*i) == route) {
+					/* already changed */
+					continue;
+				}
+
+				if ((*i)->solo_isolated() || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_auditioner()) {
+					/* route does not get solo propagated to it */
+					continue;
+				}
+
+				if ((group_already_accounted_for && (*i)->route_group() && (*i)->route_group() == rg)) {
+					/* this route is a part of the same solo group as the route
+					 * that was changed. Changing that route did change or will
+					 * change all group members appropriately, so we can ignore it
+					 * here
+					 */
 					continue;
 				}
-				(*i)->set_listen (false, this, group_override);
+				(*i)->set_listen (false, Controllable::NoGroup);
 			}
 		}
 
@@ -3579,7 +3719,7 @@ Session::route_listen_changed (bool group_override, boost::weak_ptr<Route> wpr)
 	update_route_solo_state ();
 }
 void
-Session::route_solo_isolated_changed (void* /*src*/, boost::weak_ptr<Route> wpr)
+Session::route_solo_isolated_changed (boost::weak_ptr<Route> wpr)
 {
 	boost::shared_ptr<Route> route = wpr.lock ();
 
@@ -3609,7 +3749,7 @@ Session::route_solo_isolated_changed (void* /*src*/, boost::weak_ptr<Route> wpr)
 }
 
 void
-Session::route_solo_changed (bool self_solo_change, bool group_override,  boost::weak_ptr<Route> wpr)
+Session::route_solo_changed (bool self_solo_change, Controllable::GroupControlDisposition group_override,  boost::weak_ptr<Route> wpr)
 {
 	DEBUG_TRACE (DEBUG::Solo, string_compose ("route solo change, self = %1\n", self_solo_change));
 
@@ -3630,21 +3770,51 @@ Session::route_solo_changed (bool self_solo_change, bool group_override,  boost:
 		delta = -1;
 	}
 
+	/* the route may be a member of a group that has shared-solo
+	 * semantics. If so, then all members of that group should follow the
+	 * solo of the changed route. But ... this is optional, controlled by a
+	 * Controllable::GroupControlDisposition.
+	 *
+	 * The first argument to the signal that this method is connected to is the
+	 * GroupControlDisposition value that was used to change solo.
+	 *
+	 * If the solo change was done with group semantics (either InverseGroup
+	 * (force the entire group to change even if the group shared solo is
+	 * disabled) or UseGroup (use the group, which may or may not have the
+	 * shared solo property enabled)) then as we propagate the change to
+	 * the entire session we should IGNORE THE GROUP that the changed route
+	 * belongs to.
+	 */
+
 	RouteGroup* rg = route->route_group ();
-	bool leave_group_alone = (rg && rg->is_active() && rg->is_solo());
-	if (group_override && rg) {
-		leave_group_alone = !leave_group_alone;
-	}
+	const bool group_already_accounted_for = (group_override == Controllable::ForGroup);
+
 	if (delta == 1 && Config->get_exclusive_solo()) {
 
 		/* new solo: disable all other solos, but not the group if its solo-enabled */
 
 		for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
-			if ((*i) == route || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_auditioner() ||
-			    (leave_group_alone && ((*i)->route_group() == rg))) {
+
+			if ((*i) == route) {
+				/* already changed */
+				continue;
+			}
+
+			if ((*i)->solo_isolated() || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_auditioner()) {
+				/* route does not get solo propagated to it */
+				continue;
+			}
+
+			if ((group_already_accounted_for && (*i)->route_group() && (*i)->route_group() == rg)) {
+				/* this route is a part of the same solo group as the route
+				 * that was changed. Changing that route did change or will
+				 * change all group members appropriately, so we can ignore it
+				 * here
+				 */
 				continue;
 			}
-			(*i)->set_solo (false, this, group_override);
+
+			(*i)->set_solo (false, group_override);
 		}
 	}
 
@@ -3658,8 +3828,22 @@ Session::route_solo_changed (bool self_solo_change, bool group_override,  boost:
 		bool via_sends_only;
 		bool in_signal_flow;
 
-		if ((*i) == route || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_auditioner() ||
-		    (leave_group_alone && ((*i)->route_group() == rg))) {
+		if ((*i) == route) {
+			/* already changed */
+			continue;
+		}
+
+		if ((*i)->solo_isolated() || (*i)->is_master() || (*i)->is_monitor() || (*i)->is_auditioner()) {
+			/* route does not get solo propagated to it */
+			continue;
+		}
+
+		if ((group_already_accounted_for && (*i)->route_group() && (*i)->route_group() == rg)) {
+			/* this route is a part of the same solo group as the route
+			 * that was changed. Changing that route did change or will
+			 * change all group members appropriately, so we can ignore it
+			 * here
+			 */
 			continue;
 		}
 
@@ -3725,7 +3909,7 @@ Session::route_solo_changed (bool self_solo_change, bool group_override,  boost:
 	for (RouteList::iterator i = uninvolved.begin(); i != uninvolved.end(); ++i) {
 		DEBUG_TRACE (DEBUG::Solo, string_compose ("mute change for %1, which neither feeds or is fed by %2\n", (*i)->name(), route->name()));
 		(*i)->act_on_mute ();
-		(*i)->mute_changed (this);
+		(*i)->mute_changed ();
 	}
 
 	SoloChanged (); /* EMIT SIGNAL */
@@ -3738,6 +3922,7 @@ Session::update_route_solo_state (boost::shared_ptr<RouteList> r)
 	/* now figure out if anything that matters is soloed (or is "listening")*/
 
 	bool something_soloed = false;
+	bool something_listening = false;
 	uint32_t listeners = 0;
 	uint32_t isolated = 0;
 
@@ -3753,8 +3938,9 @@ Session::update_route_solo_state (boost::shared_ptr<RouteList> r)
 		if (!(*i)->is_auditioner() && (*i)->listening_via_monitor()) {
 			if (Config->get_solo_control_is_listen_control()) {
 				listeners++;
+				something_listening = true;
 			} else {
-				(*i)->set_listen (false, this);
+				(*i)->set_listen (false, Controllable::NoGroup);
 			}
 		}
 
@@ -3768,6 +3954,11 @@ Session::update_route_solo_state (boost::shared_ptr<RouteList> r)
 		SoloActive (_non_soloed_outs_muted); /* EMIT SIGNAL */
 	}
 
+	if (something_listening != _listening) {
+		_listening = something_listening;
+		SoloActive (_listening);
+	}
+
 	_listen_cnt = listeners;
 
 	if (isolated != _solo_isolated_cnt) {
@@ -3930,6 +4121,21 @@ Session::route_by_id (PBD::ID id)
 	return boost::shared_ptr<Route> ((Route*) 0);
 }
 
+boost::shared_ptr<Processor>
+Session::processor_by_id (PBD::ID id) const
+{
+	boost::shared_ptr<RouteList> r = routes.reader ();
+
+	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+		boost::shared_ptr<Processor> p = (*i)->Route::processor_by_id (id);
+		if (p) {
+			return p;
+		}
+	}
+
+	return boost::shared_ptr<Processor> ();
+}
+
 boost::shared_ptr<Track>
 Session::track_by_diskstream_id (PBD::ID id)
 {
@@ -3960,6 +4166,19 @@ Session::route_by_remote_id (uint32_t id)
 }
 
 
+boost::shared_ptr<Route>
+Session::route_by_selected_count (uint32_t id)
+{
+	boost::shared_ptr<RouteList> r = routes.reader ();
+
+	for (RouteList::iterator i = r->begin(); i != r->end(); ++i) {
+		/* NOT IMPLEMENTED */
+	}
+
+	return boost::shared_ptr<Route> ((Route*) 0);
+}
+
+
 void
 Session::reassign_track_numbers ()
 {
@@ -4782,6 +5001,228 @@ Session::audition_playlist ()
 	queue_event (ev);
 }
 
+
+void
+Session::register_lua_function (
+		const std::string& name,
+		const std::string& script,
+		const LuaScriptParamList& args
+		)
+{
+	Glib::Threads::Mutex::Lock lm (lua_lock);
+
+	lua_State* L = lua.getState();
+
+	const std::string& bytecode = LuaScripting::get_factory_bytecode (script);
+	luabridge::LuaRef tbl_arg (luabridge::newTable(L));
+	for (LuaScriptParamList::const_iterator i = args.begin(); i != args.end(); ++i) {
+		if ((*i)->optional && !(*i)->is_set) { continue; }
+		tbl_arg[(*i)->name] = (*i)->value;
+	}
+	(*_lua_add)(name, bytecode, tbl_arg); // throws luabridge::LuaException
+	set_dirty();
+}
+
+void
+Session::unregister_lua_function (const std::string& name)
+{
+	Glib::Threads::Mutex::Lock lm (lua_lock);
+	(*_lua_del)(name); // throws luabridge::LuaException
+	lua.collect_garbage ();
+	set_dirty();
+}
+
+std::vector<std::string>
+Session::registered_lua_functions ()
+{
+	Glib::Threads::Mutex::Lock lm (lua_lock);
+	std::vector<std::string> rv;
+
+	try {
+		luabridge::LuaRef list ((*_lua_list)());
+		for (luabridge::Iterator i (list); !i.isNil (); ++i) {
+			if (!i.key ().isString ()) { assert(0); continue; }
+			rv.push_back (i.key ().cast<std::string> ());
+		}
+	} catch (luabridge::LuaException const& e) { }
+	return rv;
+}
+
+#ifndef NDEBUG
+static void _lua_print (std::string s) {
+	std::cout << "SessionLua: " << s << "\n";
+}
+#endif
+
+void
+Session::try_run_lua (pframes_t nframes)
+{
+	if (_n_lua_scripts == 0) return;
+	Glib::Threads::Mutex::Lock tm (lua_lock, Glib::Threads::TRY_LOCK);
+	if (tm.locked ()) {
+		try { (*_lua_run)(nframes); } catch (luabridge::LuaException const& e) { }
+	}
+}
+
+void
+Session::setup_lua ()
+{
+#ifndef NDEBUG
+	lua.Print.connect (&_lua_print);
+#endif
+	lua.do_command (
+			"function ArdourSession ()"
+			"  local self = { scripts = {}, instances = {} }"
+			""
+			"  local remove = function (n)"
+			"   self.scripts[n] = nil"
+			"   self.instances[n] = nil"
+			"   Session:scripts_changed()" // call back
+			"  end"
+			""
+			"  local addinternal = function (n, f, a)"
+			"   assert(type(n) == 'string', 'function-name must be string')"
+			"   assert(type(f) == 'function', 'Given script is a not a function')"
+			"   assert(type(a) == 'table' or type(a) == 'nil', 'Given argument is invalid')"
+			"   assert(self.scripts[n] == nil, 'Callback \"'.. n ..'\" already exists.')"
+			"   self.scripts[n] = { ['f'] = f, ['a'] = a }"
+			"   local env = _ENV;  env.f = nil env.io = nil env.os = nil env.loadfile = nil env.require = nil env.dofile = nil env.package = nil env.debug = nil"
+			"   local env = { print = print, Session = Session, tostring = tostring, assert = assert, ipairs = ipairs, error = error, select = select, string = string, type = type, tonumber = tonumber, collectgarbage = collectgarbage, pairs = pairs, math = math, table = table, pcall = pcall }"
+			"   self.instances[n] = load (string.dump(f, true), nil, nil, env)(a)"
+			"   Session:scripts_changed()" // call back
+			"  end"
+			""
+			"  local add = function (n, b, a)"
+			"   assert(type(b) == 'string', 'ByteCode must be string')"
+			"   load (b)()" // assigns f
+			"   assert(type(f) == 'string', 'Assigned ByteCode must be string')"
+			"   addinternal (n, load(f), a)"
+			"  end"
+			""
+			"  local run = function (...)"
+			"   for n, s in pairs (self.instances) do"
+			"     local status, err = pcall (s, ...)"
+			"     if not status then"
+			"       print ('fn \"'.. n .. '\": ', err)"
+			"       remove (n)"
+			"      end"
+			"   end"
+			"   collectgarbage()"
+			"  end"
+			""
+			"  local cleanup = function ()"
+			"   self.scripts = nil"
+			"   self.instances = nil"
+			"  end"
+			""
+			"  local list = function ()"
+			"   local rv = {}"
+			"   for n, _ in pairs (self.scripts) do"
+			"     rv[n] = true"
+			"   end"
+			"   return rv"
+			"  end"
+			""
+			"  local function basic_serialize (o)"
+			"    if type(o) == \"number\" then"
+			"     return tostring(o)"
+			"    else"
+			"     return string.format(\"%q\", o)"
+			"    end"
+			"  end"
+			""
+			"  local function serialize (name, value)"
+			"   local rv = name .. ' = '"
+			"   collectgarbage()"
+			"   if type(value) == \"number\" or type(value) == \"string\" or type(value) == \"nil\" then"
+			"    return rv .. basic_serialize(value) .. ' '"
+			"   elseif type(value) == \"table\" then"
+			"    rv = rv .. '{} '"
+			"    for k,v in pairs(value) do"
+			"     local fieldname = string.format(\"%s[%s]\", name, basic_serialize(k))"
+			"     rv = rv .. serialize(fieldname, v) .. ' '"
+			"     collectgarbage()" // string concatenation allocates a new string :(
+			"    end"
+			"    return rv;"
+			"   elseif type(value) == \"function\" then"
+			"     return rv .. string.format(\"%q\", string.dump(value, true))"
+			"   else"
+			"    error('cannot save a ' .. type(value))"
+			"   end"
+			"  end"
+			""
+			""
+			"  local save = function ()"
+			"   return (serialize('scripts', self.scripts))"
+			"  end"
+			""
+			"  local restore = function (state)"
+			"   self.scripts = {}"
+			"   load (state)()"
+			"   for n, s in pairs (scripts) do"
+			"    addinternal (n, load(s['f']), s['a'])"
+			"   end"
+			"  end"
+			""
+			" return { run = run, add = add, remove = remove,"
+		  "          list = list, restore = restore, save = save, cleanup = cleanup}"
+			" end"
+			" "
+			" sess = ArdourSession ()"
+			" ArdourSession = nil"
+			" "
+			"function ardour () end"
+			);
+
+	lua_State* L = lua.getState();
+
+	try {
+		luabridge::LuaRef lua_sess = luabridge::getGlobal (L, "sess");
+		lua.do_command ("sess = nil"); // hide it.
+		lua.do_command ("collectgarbage()");
+
+		_lua_run = new luabridge::LuaRef(lua_sess["run"]);
+		_lua_add = new luabridge::LuaRef(lua_sess["add"]);
+		_lua_del = new luabridge::LuaRef(lua_sess["remove"]);
+		_lua_list = new luabridge::LuaRef(lua_sess["list"]);
+		_lua_save = new luabridge::LuaRef(lua_sess["save"]);
+		_lua_load = new luabridge::LuaRef(lua_sess["restore"]);
+		_lua_cleanup = new luabridge::LuaRef(lua_sess["cleanup"]);
+	} catch (luabridge::LuaException const& e) {
+		fatal << string_compose (_("programming error: %1"),
+				X_("Failed to setup Lua interpreter"))
+			<< endmsg;
+		abort(); /*NOTREACHED*/
+	}
+
+	LuaBindings::stddef (L);
+	LuaBindings::common (L);
+	LuaBindings::dsp (L);
+	luabridge::push <Session *> (L, this);
+	lua_setglobal (L, "Session");
+}
+
+void
+Session::scripts_changed ()
+{
+	assert (!lua_lock.trylock()); // must hold lua_lock
+
+	try {
+		luabridge::LuaRef list ((*_lua_list)());
+		int cnt = 0;
+		for (luabridge::Iterator i (list); !i.isNil (); ++i) {
+			if (!i.key ().isString ()) { assert(0); continue; }
+			++cnt;
+		}
+		_n_lua_scripts = cnt;
+	} catch (luabridge::LuaException const& e) {
+		fatal << string_compose (_("programming error: %1"),
+				X_("Indexing Lua Session Scripts failed."))
+			<< endmsg;
+		abort(); /*NOTREACHED*/
+	}
+}
+
 void
 Session::non_realtime_set_audition ()
 {
@@ -5147,6 +5588,7 @@ Session::unmark_aux_send_id (uint32_t id)
 void
 Session::unmark_return_id (uint32_t id)
 {
+	if (_state_of_the_state & Deletion) { return; }
 	if (id < return_bitset.size()) {
 		return_bitset[id] = false;
 	}
@@ -5496,6 +5938,12 @@ Session::get_scratch_buffers (ChanCount count, bool silence)
 	return ProcessThread::get_scratch_buffers (count, silence);
 }
 
+BufferSet&
+Session::get_noinplace_buffers (ChanCount count)
+{
+	return ProcessThread::get_noinplace_buffers (count);
+}
+
 BufferSet&
 Session::get_route_buffers (ChanCount count, bool silence)
 {