2 Copyright (C) 2016 Paul Davis
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the Free
6 Software Foundation; either version 2 of the License, or (at your option)
9 This program is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 You should have received a copy of the GNU General Public License along
15 with this program; if not, write to the Free Software Foundation, Inc.,
16 675 Mass Ave, Cambridge, MA 02139, USA.
19 #ifndef __libardour_slavable_automation_control_h__
20 #define __libardour_slavable_automation_control_h__
22 #include "pbd/enumwriter.h"
24 #include "ardour/slavable_automation_control.h"
25 #include "ardour/session.h"
28 using namespace ARDOUR;
31 SlavableAutomationControl::SlavableAutomationControl(ARDOUR::Session& s,
32 const Evoral::Parameter& parameter,
33 const ParameterDescriptor& desc,
34 boost::shared_ptr<ARDOUR::AutomationList> l,
35 const std::string& name)
36 : AutomationControl (s, parameter, desc, l, name)
41 SlavableAutomationControl::get_masters_value_locked () const
43 double v = _desc.normal;
46 for (Masters::const_iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
47 if (mr->second.master()->get_value()) {
54 for (Masters::const_iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
55 /* get current master value, scale by our current ratio with that master */
56 v *= mr->second.master()->get_value () * mr->second.ratio();
59 return min ((double) _desc.upper, v);
63 SlavableAutomationControl::get_value_locked() const
65 /* read or write masters lock must be held */
67 if (_masters.empty()) {
68 return Control::get_double (false, _session.transport_frame());
72 /* for boolean/toggle controls, if this slave OR any master is
73 * enabled, this slave is enabled. So check our own value
74 * first, because if we are enabled, we can return immediately.
76 if (Control::get_double (false, _session.transport_frame())) {
81 return get_masters_value_locked ();
84 /** Get the current effective `user' value based on automation state */
86 SlavableAutomationControl::get_value() const
88 bool from_list = _list && boost::dynamic_pointer_cast<AutomationList>(_list)->automation_playback();
91 Glib::Threads::RWLock::ReaderLock lm (master_lock);
92 return get_value_locked ();
94 return Control::get_double (from_list, _session.transport_frame());
99 SlavableAutomationControl::actually_set_value (double val, Controllable::GroupControlDisposition group_override)
101 val = std::max (std::min (val, (double)_desc.upper), (double)_desc.lower);
104 Glib::Threads::RWLock::WriterLock lm (master_lock);
106 if (!_masters.empty()) {
107 recompute_masters_ratios (val);
111 /* this sets the Evoral::Control::_user_value for us, which will
112 be retrieved by AutomationControl::get_value ()
114 AutomationControl::actually_set_value (val, group_override);
116 _session.set_dirty ();
120 SlavableAutomationControl::add_master (boost::shared_ptr<AutomationControl> m)
122 std::pair<Masters::iterator,bool> res;
125 Glib::Threads::RWLock::WriterLock lm (master_lock);
126 const double current_value = get_value_locked ();
128 /* ratio will be recomputed below */
130 res = _masters.insert (make_pair<PBD::ID,MasterRecord> (m->id(), MasterRecord (m, 1.0)));
134 recompute_masters_ratios (current_value);
136 /* note that we bind @param m as a weak_ptr<AutomationControl>, thus
137 avoiding holding a reference to the control in the binding
141 m->DropReferences.connect_same_thread (masters_connections, boost::bind (&SlavableAutomationControl::master_going_away, this, m));
143 /* Store the connection inside the MasterRecord, so that when we destroy it, the connection is destroyed
144 and we no longer hear about changes to the AutomationControl.
146 Note that we fix the "from_self" argument that will
147 be given to our own Changed signal to "false",
148 because the change came from the master.
151 m->Changed.connect_same_thread (res.first->second.connection, boost::bind (&SlavableAutomationControl::master_changed, this, _1, _2, m));
152 cerr << this << enum_2_string ((AutomationType) _parameter.type()) << " now listening to Changed from " << m << endl;
157 /* this will notify everyone that we're now slaved to the master */
158 MasterStatusChange (); /* EMIT SIGNAL */
163 update_boolean_masters_records (m);
167 SlavableAutomationControl::get_boolean_masters () const
172 Glib::Threads::RWLock::ReaderLock lm (master_lock);
173 for (Masters::const_iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
174 if (mr->second.yn()) {
184 SlavableAutomationControl::update_boolean_masters_records (boost::shared_ptr<AutomationControl> m)
187 /* We may modify a MasterRecord, but we not modify the master
188 * map, so we use a ReaderLock
190 Glib::Threads::RWLock::ReaderLock lm (master_lock);
191 Masters::iterator mi = _masters.find (m->id());
192 if (mi != _masters.end()) {
193 /* update MasterRecord to show whether the master is
194 on/off. We need to store this because the master
195 may change (in the sense of emitting Changed())
196 several times without actually changing the result
197 of ::get_value(). This is a feature of
198 AutomationControls (or even just Controllables,
199 really) which have more than a simple scalar
200 value. For example, the master may be a mute control
201 which can be muted_by_self() and/or
202 muted_by_masters(). When either of those two
203 conditions changes, Changed() will be emitted, even
204 though ::get_value() will return the same value each
205 time (1.0 if either are true, 0.0 if neither is).
207 This provides a way for derived types to check
208 the last known state of a Master when the Master
209 changes. We update it after calling
210 ::master_changed() (though derived types must do
213 mi->second.set_yn (m->get_value());
219 SlavableAutomationControl::master_changed (bool /*from_self*/, GroupControlDisposition gcd, boost::shared_ptr<AutomationControl> m)
221 update_boolean_masters_records (m);
222 Changed (false, Controllable::NoGroup); /* EMIT SIGNAL */
226 SlavableAutomationControl::master_going_away (boost::weak_ptr<AutomationControl> wm)
228 boost::shared_ptr<AutomationControl> m = wm.lock();
235 SlavableAutomationControl::remove_master (boost::shared_ptr<AutomationControl> m)
237 double current_value;
240 Masters::size_type erased = 0;
242 pre_remove_master (m);
245 Glib::Threads::RWLock::WriterLock lm (master_lock);
246 current_value = get_value_locked ();
247 erased = _masters.erase (m->id());
249 recompute_masters_ratios (current_value);
251 masters_left = _masters.size ();
252 new_value = get_value_locked ();
256 MasterStatusChange (); /* EMIT SIGNAL */
259 if (new_value != current_value) {
260 if (masters_left == 0) {
261 /* no masters left, make sure we keep the same value
264 actually_set_value (current_value, Controllable::UseGroup);
268 /* no need to update boolean masters records, since the MR will have
269 * been removed already.
274 SlavableAutomationControl::clear_masters ()
276 double current_value;
278 bool had_masters = false;
280 /* null ptr means "all masters */
281 pre_remove_master (boost::shared_ptr<AutomationControl>());
284 Glib::Threads::RWLock::WriterLock lm (master_lock);
285 current_value = get_value_locked ();
286 if (!_masters.empty()) {
290 new_value = get_value_locked ();
294 MasterStatusChange (); /* EMIT SIGNAL */
297 if (new_value != current_value) {
298 actually_set_value (current_value, Controllable::UseGroup);
301 /* no need to update boolean masters records, since all MRs will have
302 * been removed already.
307 SlavableAutomationControl::slaved_to (boost::shared_ptr<AutomationControl> m) const
309 Glib::Threads::RWLock::ReaderLock lm (master_lock);
310 return _masters.find (m->id()) != _masters.end();
314 SlavableAutomationControl::slaved () const
316 Glib::Threads::RWLock::ReaderLock lm (master_lock);
317 return !_masters.empty();
320 #endif /* __libardour_slavable_automation_control_h__ */