Implement mixer-scene class

libs/ardour/ardour/mixer_scene.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2022 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _libardour_mixer_scene_h_
+#define _libardour_mixer_scene_h_
+
+#include <boost/shared_ptr.hpp>
+
+#include "pbd/controllable.h"
+#include "pbd/properties.h"
+#include "pbd/stateful.h"
+
+#include "ardour/automation_control.h"
+#include "ardour/libardour_visibility.h"
+#include "ardour/session_handle.h"
+
+namespace ARDOUR {
+
+class LIBARDOUR_API MixerScene : public SessionHandleRef, public PBD::Stateful
+{
+public:
+	MixerScene (Session&);
+
+	void snapshot ();
+	bool apply () const;
+	void clear ();
+	bool empty () const { return _ctrl_map.empty (); }
+
+	std::string name () const { return _name; }
+	bool        set_name (std::string const& name);
+
+	XMLNode& get_state () const;
+	int set_state (XMLNode const&, int version);
+
+private:
+	typedef std::map<PBD::ID, double> ControllableValueMap;
+
+	ControllableValueMap       _ctrl_map;
+	std::string                _name;
+};
+
+}
+
+#endif

libs/ardour/mixer_scene.cc

@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2022 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "pbd/types_convert.h"
+
+#include "ardour/mixer_scene.h"
+#include "ardour/session.h"
+
+#include "pbd/i18n.h"
+
+using namespace PBD;
+using namespace ARDOUR;
+
+MixerScene::MixerScene(Session& s)
+	: SessionHandleRef (s)
+{
+}
+
+bool
+MixerScene::set_name (std::string const& name)
+{
+	if (_name != name) {
+		_name = name;
+		_session.set_dirty ();
+	}
+	return true;
+}
+
+void
+MixerScene::clear ()
+{
+	_ctrl_map.clear ();
+	_name.clear ();
+}
+
+void
+MixerScene::snapshot ()
+{
+	_ctrl_map.clear ();
+	for (auto const& c : Controllable::registered_controllables ()) {
+		if (!boost::dynamic_pointer_cast<AutomationControl> (c)) {
+			continue;
+		}
+		_ctrl_map[c->id ()] = c->get_save_value ();
+	}
+	_session.set_dirty ();
+}
+
+bool
+MixerScene::apply () const
+{
+	bool rv = false;
+	// TODO special-case solo-iso, and solo (restore order, or ignore)
+	for (auto const& c : Controllable::registered_controllables ()) {
+		ControllableValueMap::const_iterator it = _ctrl_map.find (c->id ());
+		if (it == _ctrl_map.end ()) {
+			continue;
+		}
+		rv = true;
+		c->set_value (it->second, Controllable::NoGroup);
+	}
+	return rv;
+}
+
+XMLNode&
+MixerScene::get_state () const
+{
+	XMLNode* root = new XMLNode ("MixerScene");
+	root->set_property ("id", id ());
+	root->set_property ("name", name ());
+
+	for (auto const& c : _ctrl_map) {
+		XMLNode* node = new XMLNode ("ControlValue");
+		node->set_property (X_("id"), c.first);
+		node->set_property (X_("value"), c.second);
+		root->add_child_nocopy (*node);
+	}
+	return *root;
+}
+
+int
+MixerScene::set_state (XMLNode const& node, int /* version */)
+{
+	_ctrl_map.clear ();
+
+	std::string name;
+	if (node.get_property ("name", name)) {
+		set_name (name);
+	}
+
+	for (auto const& n : node.children ()) {
+		if (n->name() != "ControlValue") {
+			continue;
+		}
+		PBD::ID id;
+		double  value;
+		if (!n->get_property (X_("id"), id)) {
+			continue;
+		}
+		if (!n->get_property (X_("value"), value)) {
+			continue;
+		}
+		_ctrl_map[id] = value;
+	}
+	return 0;
+}

libs/ardour/wscript

@@ -153,6 +153,7 @@ libardour_sources = [
         'midiport_manager.cc',
         'minibpm.cc',
         'mix.cc',
+        'mixer_scene.cc',
         'mode.cc',
         'monitor_control.cc',
         'monitor_port.cc',