GainControl::GainControl (Session& session, const Evoral::Parameter ¶m, boost::shared_ptr<AutomationList> al)
: SlavableAutomationControl (session, param, ParameterDescriptor(param),
al ? al : boost::shared_ptr<AutomationList> (new AutomationList (param)),
- param.type() == GainAutomation ? X_("gaincontrol") : X_("trimcontrol")) {
-
+ param.type() == GainAutomation ? X_("gaincontrol") : X_("trimcontrol"),
+ Controllable::GainLike)
+{
alist()->reset_default (1.0);
lower_db = accurate_coefficient_to_dB (_desc.lower);
}
}
-void
-GainControl::recompute_masters_ratios (double val)
-{
- /* Master WRITE lock must be held */
-
- /* V' is the new gain value for this
-
- Mv(n) is the return value of ::get_value() for the n-th master
- Mr(n) is the return value of ::ratio() for the n-th master record
-
- the slave should return V' on the next call to ::get_value().
-
- but the value is determined by the masters, so we know:
-
- V' = (Mv(1) * Mr(1)) * (Mv(2) * Mr(2)) * ... * (Mv(n) * Mr(n))
-
- hence:
-
- Mr(1) * Mr(2) * ... * (Mr(n) = V' / (Mv(1) * Mv(2) * ... * Mv(n))
-
- if we make all ratios equal (i.e. each master contributes the same
- fraction of its own gain level to make the final slave gain), then we
- have:
-
- pow (Mr(n), n) = V' / (Mv(1) * Mv(2) * ... * Mv(n))
-
- which gives
-
- Mr(n) = pow ((V' / (Mv(1) * Mv(2) * ... * Mv(n))), 1/n)
-
- Mr(n) is the new ratio number for the slaves
- */
-
-
- const double nmasters = _masters.size();
- double masters_total_gain_coefficient = 1.0;
-
- for (Masters::iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
- masters_total_gain_coefficient *= mr->second.master()->get_value();
- }
-
- const double new_universal_ratio = pow ((val / masters_total_gain_coefficient), (1.0/nmasters));
-
- for (Masters::iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
- mr->second.reset_ratio (new_universal_ratio);
- }
-}
-
-XMLNode&
-GainControl::get_state ()
-{
- XMLNode& node (AutomationControl::get_state());
-
-#if 0
- /* store VCA master IDs */
-
- string str;
-
- {
- Glib::Threads::RWLock::ReaderLock lm (master_lock);
- for (Masters::const_iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
- if (!str.empty()) {
- str += ',';
- }
- str += PBD::to_string (mr->first, std::dec);
- }
- }
-
- if (!str.empty()) {
- node.add_property (X_("masters"), str);
- }
-#endif
-
- return node;
-}
-
-int
-GainControl::set_state (XMLNode const& node, int version)
-{
- return AutomationControl::set_state (node, version);
-}
-