add new files to source tree

1 files changed, 287 insertions, 0 deletions

diff --git a/libs/ardour/control_group.cc b/libs/ardour/control_group.cc
new file mode 100644
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--- /dev/null
+++ b/libs/ardour/control_group.cc
@@ -0,0 +1,287 @@
+/*
+    Copyright (C) 2016 Paul Davis
+
+    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.,
+    675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <vector>
+
+#include "pbd/unwind.h"
+
+#include "ardour/control_group.h"
+#include "ardour/gain_control.h"
+
+using namespace ARDOUR;
+using namespace PBD;
+
+ControlGroup::ControlGroup (Evoral::Parameter p)
+	: _parameter (p)
+	, _active (true)
+	, _mode (Mode (0))
+	, propagating (false)
+{
+}
+
+
+ControlGroup::~ControlGroup ()
+{
+	clear ();
+}
+
+void
+ControlGroup::set_active (bool yn)
+{
+	_active = yn;
+	std::cerr << " CG for " << enum_2_string ((AutomationType) _parameter.type()) << " now active ? " << _active << std::endl;
+}
+
+void
+ControlGroup::clear ()
+{
+	/* we're giving up on all members, so we don't care about their
+	 * DropReferences signals anymore
+	 */
+
+	member_connections.drop_connections ();
+
+	/* make a copy so that when the control calls ::remove_control(), we
+	 * don't deadlock.
+	 */
+
+	std::vector<boost::shared_ptr<AutomationControl> > controls;
+	{
+		Glib::Threads::RWLock::WriterLock lm (controls_lock);
+		for (ControlMap::const_iterator i = _controls.begin(); i != _controls.end(); ++i) {
+			controls.push_back (i->second);
+		}
+	}
+
+	_controls.clear ();
+
+	for (std::vector<boost::shared_ptr<AutomationControl> >::iterator c = controls.begin(); c != controls.end(); ++c) {
+		(*c)->set_group (boost::shared_ptr<ControlGroup>());
+	}
+}
+
+ControlList
+ControlGroup::controls () const
+{
+	ControlList c;
+
+	if (_active) {
+		Glib::Threads::RWLock::WriterLock lm (controls_lock);
+		for (ControlMap::const_iterator i = _controls.begin(); i != _controls.end(); ++i) {
+			c.push_back (i->second);
+		}
+	}
+
+	return c;
+}
+
+void
+ControlGroup::control_going_away (boost::weak_ptr<AutomationControl> wac)
+{
+	boost::shared_ptr<AutomationControl> ac (wac.lock());
+	if (!ac) {
+		return;
+	}
+
+	remove_control (ac);
+}
+
+int
+ControlGroup::remove_control (boost::shared_ptr<AutomationControl> ac)
+{
+	Glib::Threads::RWLock::WriterLock lm (controls_lock);
+	/* return zero if erased, non-zero otherwise */
+	return !(_controls.erase (ac->id()) > 0);
+}
+
+int
+ControlGroup::add_control (boost::shared_ptr<AutomationControl> ac)
+{
+	if (ac->parameter() != _parameter) {
+		return -1;
+	}
+
+	std::pair<ControlMap::iterator,bool> res;
+
+	{
+		Glib::Threads::RWLock::WriterLock lm (controls_lock);
+		res = _controls.insert (std::make_pair (ac->id(), ac));
+	}
+
+	if (!res.second) {
+		/* already in ControlMap */
+		return -1;
+	}
+
+	/* Inserted */
+
+	ac->set_group (shared_from_this());
+
+	ac->DropReferences.connect_same_thread (member_connections, boost::bind (&ControlGroup::control_going_away, this, boost::weak_ptr<AutomationControl>(ac)));
+
+	return 0;
+}
+
+void
+ControlGroup::set_group_value (boost::shared_ptr<AutomationControl> control, double val)
+{
+	double old = control->get_value ();
+
+	/* set the primary control */
+
+	control->set_value (val, Controllable::ForGroup);
+
+	/* now propagate across the group */
+
+	Glib::Threads::RWLock::ReaderLock lm (controls_lock);
+
+	if (_mode & Relative) {
+
+		const double factor = old / control->get_value ();
+
+		for (ControlMap::iterator c = _controls.begin(); c != _controls.end(); ++c) {
+			if (c->second != control) {
+				c->second->set_value (factor * c->second->get_value(), Controllable::ForGroup);
+			}
+		}
+
+	} else {
+
+		for (ControlMap::iterator c = _controls.begin(); c != _controls.end(); ++c) {
+			if (c->second != control) {
+				c->second->set_value (val, Controllable::ForGroup);
+			}
+		}
+	}
+}
+
+/*---- GAIN CONTROL GROUP -----------*/
+
+gain_t
+GainControlGroup::get_min_factor (gain_t factor)
+{
+	/* CALLER MUST HOLD READER LOCK */
+
+	for (ControlMap::iterator c = _controls.begin(); c != _controls.end(); ++c) {
+		gain_t const g = c->second->get_value();
+
+		if ((g + g * factor) >= 0.0f) {
+			continue;
+		}
+
+		if (g <= 0.0000003f) {
+			return 0.0f;
+		}
+
+		factor = 0.0000003f / g - 1.0f;
+	}
+
+	return factor;
+}
+
+gain_t
+GainControlGroup::get_max_factor (gain_t factor)
+{
+	/* CALLER MUST HOLD READER LOCK */
+
+	for (ControlMap::iterator c = _controls.begin(); c != _controls.end(); ++c) {
+		gain_t const g = c->second->get_value();
+
+		// if the current factor woulnd't raise this route above maximum
+		if ((g + g * factor) <= 1.99526231f) {
+			continue;
+		}
+
+		// if route gain is already at peak, return 0.0f factor
+		if (g >= 1.99526231f) {
+			return 0.0f;
+		}
+
+		// factor is calculated so that it would raise current route to max
+		factor = 1.99526231f / g - 1.0f;
+	}
+
+	return factor;
+}
+
+void
+GainControlGroup::set_group_value (boost::shared_ptr<AutomationControl> control, double val)
+{
+	/* set the primary control */
+
+	control->set_value (val, Controllable::ForGroup);
+
+	/* now propagate across the group */
+
+	Glib::Threads::RWLock::ReaderLock lm (controls_lock);
+
+	if (_mode & Relative) {
+
+		gain_t usable_gain = control->get_value();
+
+		if (usable_gain < 0.000001f) {
+			usable_gain = 0.000001f;
+		}
+
+		gain_t delta = val;
+		if (delta < 0.000001f) {
+			delta = 0.000001f;
+		}
+
+		delta -= usable_gain;
+
+		if (delta == 0.0f)
+			return;
+
+		gain_t factor = delta / usable_gain;
+
+		if (factor > 0.0f) {
+			factor = get_max_factor (factor);
+			if (factor == 0.0f) {
+				control->Changed (true, Controllable::ForGroup); /* EMIT SIGNAL */
+				return;
+			}
+		} else {
+			factor = get_min_factor (factor);
+			if (factor == 0.0f) {
+				control->Changed (true, Controllable::ForGroup); /* EMIT SIGNAL */
+				return;
+			}
+		}
+
+		for (ControlMap::iterator c = _controls.begin(); c != _controls.end(); ++c) {
+			if (c->second == control) {
+				continue;
+			}
+
+			boost::shared_ptr<GainControl> gc = boost::dynamic_pointer_cast<GainControl> (c->second);
+
+			if (gc) {
+				gc->inc_gain (factor);
+			}
+		}
+
+	} else {
+
+		for (ControlMap::iterator c = _controls.begin(); c != _controls.end(); ++c) {
+			if (c->second != control) {
+				c->second->set_value (val, Controllable::ForGroup);
+			}
+		}
+	}
+}