675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#include <cmath>
+
#include "pbd/convert.h"
#include "pbd/strsplit.h"
#include "ardour/vca.h"
#include "ardour/vca_manager.h"
-#include "i18n.h"
+#include "pbd/i18n.h"
using namespace ARDOUR;
using namespace std;
GainControl::GainControl (Session& session, const Evoral::Parameter ¶m, boost::shared_ptr<AutomationList> al)
- : AutomationControl (session, param, ParameterDescriptor(param),
- al ? al : boost::shared_ptr<AutomationList> (new AutomationList (param)),
- param.type() == GainAutomation ? X_("gaincontrol") : X_("trimcontrol")) {
+ : SlavableAutomationControl (session, param, ParameterDescriptor(param),
+
al ? al : boost::shared_ptr<AutomationList> (new AutomationList (param)),
+ param.type() == GainAutomation ? X_("gaincontrol") : X_("trimcontrol")) {
alist()->reset_default (1.0);
range_db = accurate_coefficient_to_dB (_desc.upper) - lower_db;
}
-void
-GainControl::set_value (double val, PBD::Controllable::GroupControlDisposition group_override)
-{
- if (writable()) {
- _set_value (val, group_override);
- }
-}
-
-void
-GainControl::set_value_unchecked (double val)
-{
- /* used only automation playback */
- _set_value (val, Controllable::NoGroup);
-}
-
-void
-GainControl::_set_value (double val, Controllable::GroupControlDisposition group_override)
-{
- AutomationControl::set_value (std::max (std::min (val, (double)_desc.upper), (double)_desc.lower), group_override);
- _session.set_dirty ();
-}
-
double
GainControl::internal_to_interface (double v) const
{
return std::string(theBuf);
}
-gain_t
-GainControl::get_master_gain () const
+void
+GainControl::inc_gain (gain_t factor)
{
- Glib::Threads::Mutex::Lock sm (master_lock, Glib::Threads::TRY_LOCK);
+ /* To be used ONLY when doing group-relative gain adjustment, from
+ * ControlGroup::set_group_values().
+ */
- if (sm.locked()) {
- return get_master_gain_locked ();
- }
+ const float desired_gain = user_double();
- return 1.0;
+ if (fabsf (desired_gain) < GAIN_COEFF_SMALL) {
+ // really?! what's the idea here?
+ actually_set_value (0.000001f + (0.000001f * factor), Controllable::ForGroup);
+ } else {
+ actually_set_value (desired_gain + (desired_gain * factor), Controllable::ForGroup);
+ }
}
-gain_t
-GainControl::get_master_gain_locked () const
+void
+GainControl::recompute_masters_ratios (double val)
{
- /* Master lock MUST be held */
+ /* Master WRITE lock must be held */
- gain_t g = 1.0;
+ /* V' is the new gain value for this
- for (Masters::const_iterator m = _masters.begin(); m != _masters.end(); ++m) {
- g *= (*m)->get_value ();
- }
+ 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
- return g;
-}
+ the slave should return V' on the next call to ::get_value().
-void
-GainControl::add_master (boost::shared_ptr<VCA> vca)
-{
- gain_t old_master_val;
- gain_t new_master_val;
+ but the value is determined by the masters, so we know:
- {
- Glib::Threads::Mutex::Lock lm (master_lock);
- old_master_val = get_master_gain_locked ();
- _masters.insert (vca->control());
- _masters_numbers.insert (vca->number());
- new_master_val = get_master_gain_locked ();
+ V' = (Mv(1) * Mr(1)) * (Mv(2) * Mr(2)) * ... * (Mv(n) * Mr(n))
- /* note that we bind @param m as a weak_ptr<GainControl>, thus
- avoiding holding a reference to the control in the binding
- itself.
- */
+ hence:
- vca->DropReferences.connect_same_thread (masters_connections, boost::bind (&GainControl::master_going_away, this, vca));
+ 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:
- if (old_master_val != new_master_val) {
- Changed(); /* EMIT SIGNAL */
- }
-}
+ pow (Mr(n), n) = V' / (Mv(1) * Mv(2) * ... * Mv(n))
-void
-GainControl::master_going_away (boost::weak_ptr<VCA> wv)
-{
- boost::shared_ptr<VCA> v = wv.lock();
- if (v) {
- remove_master (v);
- }
-}
+ which gives
-void
-GainControl::remove_master (boost::shared_ptr<VCA> vca)
-{
- gain_t old_master_val;
- gain_t new_master_val;
+ Mr(n) = pow ((V' / (Mv(1) * Mv(2) * ... * Mv(n))), 1/n)
- {
- Glib::Threads::Mutex::Lock lm (master_lock);
- old_master_val = get_master_gain_locked ();
- _masters.erase (vca->control());
- _masters_numbers.erase (vca->number());
- new_master_val = get_master_gain_locked ();
- }
+ Mr(n) is the new ratio number for the slaves
+ */
- if (old_master_val != new_master_val) {
- Changed(); /* EMIT SIGNAL */
- }
-}
-void
-GainControl::clear_masters ()
-{
- gain_t old_master_val;
- gain_t new_master_val;
+ const double nmasters = _masters.size();
+ double masters_total_gain_coefficient = 1.0;
- {
- Glib::Threads::Mutex::Lock lm (master_lock);
- old_master_val = get_master_gain_locked ();
- _masters.clear ();
- _masters_numbers.clear ();
- new_master_val = get_master_gain_locked ();
+ for (Masters::iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
+ masters_total_gain_coefficient *= mr->second.master()->get_value();
}
- if (old_master_val != new_master_val) {
- Changed(); /* EMIT SIGNAL */
- }
-}
+ const double new_universal_ratio = pow ((val / masters_total_gain_coefficient), (1.0/nmasters));
-bool
-GainControl::slaved_to (boost::shared_ptr<VCA> vca) const
-{
- Glib::Threads::Mutex::Lock lm (master_lock);
- return find (_masters.begin(), _masters.end(), vca->control()) != _masters.end();
+ for (Masters::iterator mr = _masters.begin(); mr != _masters.end(); ++mr) {
+ mr->second.reset_ratio (new_universal_ratio);
+ }
}
XMLNode&
{
XMLNode& node (AutomationControl::get_state());
+#if 0
/* store VCA master IDs */
string str;
{
- Glib::Threads::Mutex::Lock lm (master_lock);
- for (set<uint32_t>::const_iterator m = _masters_numbers.begin(); m != _masters_numbers.end(); ++m) {
+ 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 (*m, std::dec);
+ 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)
{
- AutomationControl::set_state (node, version);
-
- XMLProperty const* prop = node.property (X_("masters"));
-
- /* XXXProblem here if we allow VCA's to be slaved to other VCA's .. we
- * have to load all VCAs first, then call ::set_state() so that
- * vca_by_number() will succeed.
- */
-
- if (prop) {
- vector<string> masters;
- split (prop->value(), masters, ',');
-
- for (vector<string>::const_iterator m = masters.begin(); m != masters.end(); ++m) {
- boost::shared_ptr<VCA> vca = _session.vca_manager().vca_by_number (PBD::atoi (*m));
- if (vca) {
- add_master (vca);
- }
- }
- }
-
- return 0;
+ return AutomationControl::set_state (node, version);
}
+
projects / ardour.git / blobdiff