NoiseReduction.cpp

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  NoiseReduction.cpp
 
  Dominic Mazzoni
 
  detailed rewriting by
  Paul Licameli
 
*******************************************************************/
#include "NoiseReduction.h"
 
#include "LoadEffects.h"
#include "EffectManager.h"
#include "EffectPreview.h"
#include "EffectUI.h"
 
#include "ShuttleGui.h"
#include "HelpSystem.h"
 
#include "AudacityMessageBox.h"
#include "../widgets/valnum.h"
 
#if defined(__WXMSW__) && !defined(__CYGWIN__)
#include <float.h>
#define finite(x) _finite(x)
#endif
 
#include <wx/button.h>
#include <wx/choice.h>
#include <wx/radiobut.h>
#include <wx/slider.h>
#include <wx/valtext.h>
#include <wx/textctrl.h>
 
/****************************************************************//*****************************************************************/
 
//----------------------------------------------------------------------------
// EffectNoiseReduction::Dialog
//----------------------------------------------------------------------------
 
class EffectNoiseReduction::Dialog final : public EffectDialog
{
public:
   // constructors and destructors
   Dialog(EffectNoiseReduction *effect, EffectSettingsAccess &access,
       Settings *settings,
       wxWindow *parent, bool bHasProfile,
       bool bAllowTwiddleSettings);
 
   void PopulateOrExchange(ShuttleGui & S) override;
   bool TransferDataToWindow() override;
   bool TransferDataFromWindow() override;
 
   const Settings &GetTempSettings() const
   { return mTempSettings; }
 
private:
   void DisableControlsIfIsolating();
 
#ifdef ADVANCED_SETTINGS
   void EnableDisableSensitivityControls();
#endif
 
   // handlers
   void OnGetProfile( wxCommandEvent &event );
   void OnNoiseReductionChoice( wxCommandEvent &event );
#ifdef ADVANCED_SETTINGS
   void OnMethodChoice(wxCommandEvent &);
#endif
   void OnPreview(wxCommandEvent &event) override;
   void OnReduceNoise( wxCommandEvent &event );
   void OnCancel( wxCommandEvent &event );
   void OnHelp( wxCommandEvent &event );
 
   void OnText(wxCommandEvent &event);
   void OnSlider(wxCommandEvent &event);
 
   // data members
 
   EffectNoiseReduction *m_pEffect;
   EffectSettingsAccess &mAccess;
   EffectNoiseReduction::Settings *m_pSettings;
   EffectNoiseReduction::Settings mTempSettings;
 
   bool mbHasProfile;
   bool mbAllowTwiddleSettings;
 
 
   wxRadioButton *mKeepSignal;
#ifdef ISOLATE_CHOICE
   wxRadioButton *mKeepNoise;
#endif
#ifdef RESIDUE_CHOICE
   wxRadioButton *mResidue;
#endif
 
private:
    DECLARE_EVENT_TABLE()
};
 
namespace{ BuiltinEffectsModule::Registration< EffectNoiseReduction > reg; }
 
namespace
{
int PromptUser(
   EffectNoiseReduction::Settings& settings, EffectNoiseReduction* effect,
   EffectSettingsAccess& access, wxWindow& parent, bool bHasProfile,
   bool bAllowTwiddleSettings)
{
   EffectNoiseReduction::Dialog dlog(
      effect, access, &settings, &parent, bHasProfile, bAllowTwiddleSettings);
 
   dlog.CentreOnParent();
   dlog.ShowModal();
 
   const auto returnCode = dlog.GetReturnCode();
   if (!returnCode)
      return 0;
 
   settings = dlog.GetTempSettings();
   settings.mDoProfile = (returnCode == 1);
 
   if (!settings.PrefsIO(false))
      return 0;
   return returnCode;
}
} // namespace
 
 
int EffectNoiseReduction::ShowHostInterface(EffectBase &,
   wxWindow &parent, const EffectDialogFactory &,
   std::shared_ptr<EffectInstance> &pInstance, EffectSettingsAccess &access,
   bool forceModal)
{
   // Assign the out parameter
   pInstance = MakeInstance();
 
   // to do: use forceModal correctly
 
   // Doesn't use the factory but substitutes its own dialog
 
   // We may want to twiddle the levels if we are setting
   // from a macro editing dialog
   return PromptUser(*mSettings, this, access, parent,
      bool(mStatistics), IsBatchProcessing());
}
 
//----------------------------------------------------------------------------
// EffectNoiseReduction::Dialog
//----------------------------------------------------------------------------
 
enum {
   ID_BUTTON_GETPROFILE = 10001,
   ID_RADIOBUTTON_KEEPSIGNAL,
#ifdef ISOLATE_CHOICE
   ID_RADIOBUTTON_KEEPNOISE,
#endif
#ifdef RESIDUE_CHOICE
   ID_RADIOBUTTON_RESIDUE,
#endif
 
#ifdef ADVANCED_SETTINGS
   ID_CHOICE_METHOD,
#endif
 
   // Slider/text pairs
   ID_GAIN_SLIDER,
   ID_GAIN_TEXT,
 
   ID_NEW_SENSITIVITY_SLIDER,
   ID_NEW_SENSITIVITY_TEXT,
 
#ifdef ATTACK_AND_RELEASE
   ID_ATTACK_TIME_SLIDER,
   ID_ATTACK_TIME_TEXT,
 
   ID_RELEASE_TIME_SLIDER,
   ID_RELEASE_TIME_TEXT,
#endif
 
   ID_FREQ_SLIDER,
   ID_FREQ_TEXT,
 
   END_OF_BASIC_SLIDERS,
 
#ifdef ADVANCED_SETTINGS
   ID_OLD_SENSITIVITY_SLIDER = END_OF_BASIC_SLIDERS,
   ID_OLD_SENSITIVITY_TEXT,
 
   END_OF_ADVANCED_SLIDERS,
   END_OF_SLIDERS = END_OF_ADVANCED_SLIDERS,
#else
   END_OF_SLIDERS = END_OF_BASIC_SLIDERS,
#endif
 
   FIRST_SLIDER = ID_GAIN_SLIDER,
};
 
namespace {
 
struct ControlInfo {
   typedef double (EffectNoiseReduction::Settings::*MemberPointer);
 
   double Value(long sliderSetting) const
   {
      return
         valueMin +
         (double(sliderSetting) / sliderMax) * (valueMax - valueMin);
   }
 
   long SliderSetting(double value) const
   {
      return std::clamp<long>(
         0.5 + sliderMax * (value - valueMin) / (valueMax - valueMin),
         0, sliderMax);
   }
 
   wxString Text(double value) const
   {
      if (formatAsInt)
         return wxString::Format(format, (int)(value));
      else
         return wxString::Format(format, value);
   }
 
   void CreateControls(int id, ShuttleGui &S) const
   {
      wxTextCtrl *const text = S.Id(id + 1)
         .Validator<FloatingPointValidator<double>>(
            formatAsInt ? 0 : 2,
            nullptr,
            NumValidatorStyle::DEFAULT,
            valueMin, valueMax
         )
         .AddTextBox(textBoxCaption, wxT(""), 0);
 
      wxSlider *const slider =
         S.Id(id)
            .Name( sliderName )
            .Style(wxSL_HORIZONTAL)
            .MinSize( { 150, -1 } )
            .AddSlider( {}, 0, sliderMax);
   }
 
   MemberPointer field;
   double valueMin;
   double valueMax;
   long sliderMax;
   // (valueMin - valueMax) / sliderMax is the value increment of the slider
   const wxChar* format;
   bool formatAsInt;
   const TranslatableString textBoxCaption;
   const TranslatableString sliderName;
 
   ControlInfo(MemberPointer f, double vMin, double vMax, long sMax, const wxChar* fmt, bool fAsInt,
      const TranslatableString &caption, const TranslatableString &name)
      : field(f), valueMin(vMin), valueMax(vMax), sliderMax(sMax), format(fmt), formatAsInt(fAsInt)
      , textBoxCaption(caption), sliderName(name)
   {
   }
};
 
const ControlInfo *controlInfo() {
   static const ControlInfo table[] = {
         ControlInfo(&EffectNoiseReduction::Settings::mNoiseGain,
         0.0, 48.0, 48, wxT("%d"), true,
         XXO("&Noise reduction (dB):"), XO("Noise reduction")),
         ControlInfo(&EffectNoiseReduction::Settings::mNewSensitivity,
         0.01, 24.0, 48, wxT("%.2f"), false,
         XXO("&Sensitivity:"), XO("Sensitivity")),
#ifdef ATTACK_AND_RELEASE
         ControlInfo(&EffectNoiseReduction::Settings::mAttackTime,
         0, 1.0, 100, wxT("%.2f"), false,
         XXO("Attac&k time (secs):"), XO("Attack time")),
         ControlInfo(&EffectNoiseReduction::Settings::mReleaseTime,
         0, 1.0, 100, wxT("%.2f"), false,
         XXO("R&elease time (secs):"), XO("Release time")),
#endif
         ControlInfo(&EffectNoiseReduction::Settings::mFreqSmoothingBands,
         0, 12, 12, wxT("%d"), true,
         XXO("&Frequency smoothing (bands):"), XO("Frequency smoothing")),
 
#ifdef ADVANCED_SETTINGS
         ControlInfo(&EffectNoiseReduction::Settings::mOldSensitivity,
         -20.0, 20.0, 4000, wxT("%.2f"), false,
         XXO("Sensiti&vity (dB):"), XO("Old Sensitivity")),
         // add here
#endif
   };
 
return table;
}
 
} // namespace
 
 
BEGIN_EVENT_TABLE(EffectNoiseReduction::Dialog, wxDialogWrapper)
   EVT_BUTTON(wxID_OK, EffectNoiseReduction::Dialog::OnReduceNoise)
   EVT_BUTTON(wxID_CANCEL, EffectNoiseReduction::Dialog::OnCancel)
   EVT_BUTTON(ID_EFFECT_PREVIEW, EffectNoiseReduction::Dialog::OnPreview)
   EVT_BUTTON(ID_BUTTON_GETPROFILE, EffectNoiseReduction::Dialog::OnGetProfile)
   EVT_BUTTON(wxID_HELP, EffectNoiseReduction::Dialog::OnHelp)
 
   EVT_RADIOBUTTON(ID_RADIOBUTTON_KEEPSIGNAL, EffectNoiseReduction::Dialog::OnNoiseReductionChoice)
#ifdef ISOLATE_CHOICE
   EVT_RADIOBUTTON(ID_RADIOBUTTON_KEEPNOISE, EffectNoiseReduction::Dialog::OnNoiseReductionChoice)
#endif
#ifdef RESIDUE_CHOICE
   EVT_RADIOBUTTON(ID_RADIOBUTTON_RESIDUE, EffectNoiseReduction::Dialog::OnNoiseReductionChoice)
#endif
 
#ifdef ADVANCED_SETTINGS
   EVT_CHOICE(ID_CHOICE_METHOD, EffectNoiseReduction::Dialog::OnMethodChoice)
#endif
 
   EVT_SLIDER(ID_GAIN_SLIDER, EffectNoiseReduction::Dialog::OnSlider)
   EVT_TEXT(ID_GAIN_TEXT, EffectNoiseReduction::Dialog::OnText)
 
   EVT_SLIDER(ID_NEW_SENSITIVITY_SLIDER, EffectNoiseReduction::Dialog::OnSlider)
   EVT_TEXT(ID_NEW_SENSITIVITY_TEXT, EffectNoiseReduction::Dialog::OnText)
 
   EVT_SLIDER(ID_FREQ_SLIDER, EffectNoiseReduction::Dialog::OnSlider)
   EVT_TEXT(ID_FREQ_TEXT, EffectNoiseReduction::Dialog::OnText)
 
#ifdef ATTACK_AND_RELEASE
   EVT_SLIDER(ID_ATTACK_TIME_SLIDER, EffectNoiseReduction::Dialog::OnSlider)
   EVT_TEXT(ID_ATTACK_TIME_TEXT, EffectNoiseReduction::Dialog::OnText)
 
   EVT_SLIDER(ID_RELEASE_TIME_SLIDER, EffectNoiseReduction::Dialog::OnSlider)
   EVT_TEXT(ID_RELEASE_TIME_TEXT, EffectNoiseReduction::Dialog::OnText)
#endif
 
 
#ifdef ADVANCED_SETTINGS
   EVT_SLIDER(ID_OLD_SENSITIVITY_SLIDER, EffectNoiseReduction::Dialog::OnSlider)
   EVT_TEXT(ID_OLD_SENSITIVITY_TEXT, EffectNoiseReduction::Dialog::OnText)
#endif
END_EVENT_TABLE()
 
EffectNoiseReduction::Dialog::Dialog(EffectNoiseReduction *effect,
    EffectSettingsAccess &access,
    EffectNoiseReduction::Settings *settings,
    wxWindow *parent, bool bHasProfile, bool bAllowTwiddleSettings)
   : EffectDialog( parent, XO("Noise Reduction"), EffectTypeProcess,wxDEFAULT_DIALOG_STYLE, eHelpButton )
   , m_pEffect(effect)
   , mAccess{access}
   , m_pSettings(settings) // point to
   , mTempSettings(*settings)  // copy
   , mbHasProfile(bHasProfile)
   , mbAllowTwiddleSettings(bAllowTwiddleSettings)
   // NULL out the control members until the controls are created.
   , mKeepSignal(NULL)
#ifdef ISOLATE_CHOICE
   , mKeepNoise(NULL)
#endif
#ifdef RESIDUE_CHOICE
   , mResidue(NULL)
#endif
{
   EffectDialog::Init();
 
   wxButton *const pButtonPreview =
      (wxButton *)wxWindow::FindWindowById(ID_EFFECT_PREVIEW, this);
   wxButton *const pButtonReduceNoise =
      (wxButton *)wxWindow::FindWindowById(wxID_OK, this);
 
   if (mbHasProfile || mbAllowTwiddleSettings) {
      pButtonPreview->Enable(!mbAllowTwiddleSettings);
      pButtonReduceNoise->SetFocus();
   }
   else {
      pButtonPreview->Enable(false);
      pButtonReduceNoise->Enable(false);
   }
}
 
void EffectNoiseReduction::Dialog::DisableControlsIfIsolating()
{
   // If Isolate is chosen, disable controls that define
   // "what to do with noise" rather than "what is noise."
   // Else, enable them.
   // This does NOT include sensitivity, NEW or old, nor
   // the choice of window functions, size, or step.
   // The method choice is not included, because it affects
   // which sensitivity slider is operative, and that is part
   // of what defines noise.
 
   static const int toDisable[] = {
      ID_GAIN_SLIDER,
      ID_GAIN_TEXT,
 
      ID_FREQ_SLIDER,
      ID_FREQ_TEXT,
 
#ifdef ATTACK_AND_RELEASE
      ID_ATTACK_TIME_SLIDER,
      ID_ATTACK_TIME_TEXT,
 
      ID_RELEASE_TIME_SLIDER,
      ID_RELEASE_TIME_TEXT,
#endif
   };
   static const auto nToDisable = sizeof(toDisable) / sizeof(toDisable[0]);
 
   bool bIsolating =
#ifdef ISOLATE_CHOICE
      mKeepNoise->GetValue();
#else
      false;
#endif
   for (auto ii = nToDisable; ii--;)
      wxWindow::FindWindowById(toDisable[ii], this)->Enable(!bIsolating);
}
 
#ifdef ADVANCED_SETTINGS
void EffectNoiseReduction::Dialog::EnableDisableSensitivityControls()
{
   wxChoice *const pChoice =
      static_cast<wxChoice*>(wxWindow::FindWindowById(ID_CHOICE_METHOD, this));
   const bool bOldMethod =
      pChoice->GetSelection() == DM_OLD_METHOD;
   wxWindow::FindWindowById(ID_OLD_SENSITIVITY_SLIDER, this)->Enable(bOldMethod);
   wxWindow::FindWindowById(ID_OLD_SENSITIVITY_TEXT, this)->Enable(bOldMethod);
   wxWindow::FindWindowById(ID_NEW_SENSITIVITY_SLIDER, this)->Enable(!bOldMethod);
   wxWindow::FindWindowById(ID_NEW_SENSITIVITY_TEXT, this)->Enable(!bOldMethod);
}
#endif
 
void EffectNoiseReduction::Dialog::OnGetProfile(wxCommandEvent & WXUNUSED(event))
{
   // Project has not be changed so skip pushing state
   EffectManager::Get().SetSkipStateFlag(true);
 
   if (!TransferDataFromWindow())
      return;
 
   // Return code distinguishes this first step from the actual effect
   EndModal(1);
}
 
// This handles the whole radio group
void EffectNoiseReduction::Dialog::OnNoiseReductionChoice( wxCommandEvent & WXUNUSED(event))
{
   if (mKeepSignal->GetValue())
      mTempSettings.mNoiseReductionChoice = NRC_REDUCE_NOISE;
#ifdef ISOLATE_CHOICE
   else if (mKeepNoise->GetValue())
      mTempSettings.mNoiseReductionChoice = NRC_ISOLATE_NOISE;
#endif
#ifdef RESIDUE_CHOICE
   else
      mTempSettings.mNoiseReductionChoice = NRC_LEAVE_RESIDUE;
#endif
   DisableControlsIfIsolating();
}
 
#ifdef ADVANCED_SETTINGS
void EffectNoiseReduction::Dialog::OnMethodChoice(wxCommandEvent &)
{
   EnableDisableSensitivityControls();
}
#endif
 
void EffectNoiseReduction::Dialog::OnPreview(wxCommandEvent & WXUNUSED(event))
{
   if (!TransferDataFromWindow())
      return;
 
   // Save & restore parameters around Preview, because we didn't do OK.
   auto cleanup = valueRestorer( *m_pSettings );
   *m_pSettings = mTempSettings;
   m_pSettings->mDoProfile = false;
 
   EffectPreview(*m_pEffect, mAccess,
      // Don't need any UI updates for preview
      {},
      false);
}
 
void EffectNoiseReduction::Dialog::OnReduceNoise( wxCommandEvent & WXUNUSED(event))
{
   if (!TransferDataFromWindow())
      return;
 
   EndModal(2);
}
 
void EffectNoiseReduction::Dialog::OnCancel(wxCommandEvent & WXUNUSED(event))
{
   EndModal(0);
}
 
void EffectNoiseReduction::Dialog::OnHelp(wxCommandEvent & WXUNUSED(event))
{
   HelpSystem::ShowHelp(this, "Noise_Reduction", true);
}
 
void EffectNoiseReduction::Dialog::PopulateOrExchange(ShuttleGui & S)
{
   S.StartStatic(XO("Step 1"));
   {
      S.AddVariableText(XO(
"Select a few seconds of just noise so Audacity knows what to filter out,\nthen click Get Noise Profile:"));
      //m_pButton_GetProfile =
      S.Id(ID_BUTTON_GETPROFILE).AddButton(XXO("&Get Noise Profile"));
   }
   S.EndStatic();
 
   S.StartStatic(XO("Step 2"));
   {
      S.AddVariableText(XO(
"Select all of the audio you want filtered, choose how much noise you want\nfiltered out, and then click 'OK' to reduce noise.\n"));
 
      S.StartMultiColumn(3, wxEXPAND);
      S.SetStretchyCol(2);
      {
         for (int id = FIRST_SLIDER; id < END_OF_BASIC_SLIDERS; id += 2) {
            const ControlInfo &info = controlInfo()[(id - FIRST_SLIDER) / 2];
            info.CreateControls(id, S);
         }
      }
      S.EndMultiColumn();
 
      S.StartMultiColumn(
         2
#ifdef RESIDUE_CHOICE
         +1
#endif
#ifdef ISOLATE_CHOICE
         +1
#endif
         ,
         wxALIGN_CENTER_HORIZONTAL);
      {
         S.AddPrompt(XXO("Noise:"));
         mKeepSignal = S.Id(ID_RADIOBUTTON_KEEPSIGNAL)
               /* i18n-hint: Translate differently from "Residue" ! */
               .AddRadioButton(XXO("Re&duce"));
#ifdef ISOLATE_CHOICE
         mKeepNoise = S.Id(ID_RADIOBUTTON_KEEPNOISE)
               .AddRadioButtonToGroup(XXO("&Isolate"));
#endif
#ifdef RESIDUE_CHOICE
         mResidue = S.Id(ID_RADIOBUTTON_RESIDUE)
               /* i18n-hint: Means the difference between effect and original sound.  Translate differently from "Reduce" ! */
               .AddRadioButtonToGroup(XXO("Resid&ue"));
#endif
      }
      S.EndMultiColumn();
   }
   S.EndStatic();
 
 
#ifdef ADVANCED_SETTINGS
   S.StartStatic(XO("Advanced Settings"));
   {
      S.StartMultiColumn(2);
      {
         S.TieChoice(XXO("&Window types:"),
            mTempSettings.mWindowTypes,
            []{
               TranslatableStrings windowTypeChoices;
               for (size_t ii = 0; ii < WT_N_WINDOW_TYPES; ++ii)
                  windowTypeChoices.push_back(windowTypesInfo[ii].name);
               return windowTypeChoices;
            }()
         );
 
         S.TieChoice(XXO("Window si&ze:"),
            mTempSettings.mWindowSizeChoice,
            {
               XO("8") ,
               XO("16") ,
               XO("32") ,
               XO("64") ,
               XO("128") ,
               XO("256") ,
               XO("512") ,
               XO("1024") ,
               XO("2048 (default)") ,
               XO("4096") ,
               XO("8192") ,
               XO("16384") ,
            }
         );
 
         S.TieChoice(XXO("S&teps per window:"),
            mTempSettings.mStepsPerWindowChoice,
            {
               XO("2") ,
               XO("4 (default)") ,
               XO("8") ,
               XO("16") ,
               XO("32") ,
               XO("64") ,
            }
         );
 
         S.Id(ID_CHOICE_METHOD)
         .TieChoice(XXO("Discrimination &method:"),
            mTempSettings.mMethod,
            []{
               TranslatableStrings methodChoices;
               auto nn = DM_N_METHODS;
#ifndef OLD_METHOD_AVAILABLE
               --nn;
#endif
               for (auto ii = 0; ii < nn; ++ii)
                  methodChoices.push_back(discriminationMethodInfo[ii].name);
               return methodChoices;
            }());
      }
      S.EndMultiColumn();
 
      S.StartMultiColumn(3, wxEXPAND);
      S.SetStretchyCol(2);
      {
         for (int id = END_OF_BASIC_SLIDERS; id < END_OF_ADVANCED_SLIDERS; id += 2) {
            const ControlInfo &info = controlInfo()[(id - FIRST_SLIDER) / 2];
            info.CreateControls(id, S);
         }
      }
      S.EndMultiColumn();
   }
   S.EndStatic();
#endif
}
 
bool EffectNoiseReduction::Dialog::TransferDataToWindow()
{
   // Do the choice controls:
   if (!EffectDialog::TransferDataToWindow())
      return false;
 
   for (int id = FIRST_SLIDER; id < END_OF_SLIDERS; id += 2) {
      wxSlider* slider =
         static_cast<wxSlider*>(wxWindow::FindWindowById(id, this));
      wxTextCtrl* text =
         static_cast<wxTextCtrl*>(wxWindow::FindWindowById(id + 1, this));
      const ControlInfo &info = controlInfo()[(id - FIRST_SLIDER) / 2];
      const double field = mTempSettings.*(info.field);
      text->SetValue(info.Text(field));
      slider->SetValue(info.SliderSetting(field));
   }
 
   mKeepSignal->SetValue(mTempSettings.mNoiseReductionChoice == NRC_REDUCE_NOISE);
#ifdef ISOLATE_CHOICE
   mKeepNoise->SetValue(mTempSettings.mNoiseReductionChoice == NRC_ISOLATE_NOISE);
#endif
#ifdef RESIDUE_CHOICE
   mResidue->SetValue(mTempSettings.mNoiseReductionChoice == NRC_LEAVE_RESIDUE);
#endif
 
   // Set the enabled states of controls
   DisableControlsIfIsolating();
#ifdef ADVANCED_SETTINGS
   EnableDisableSensitivityControls();
#endif
 
   return true;
}
 
bool EffectNoiseReduction::Dialog::TransferDataFromWindow()
{
   if( !wxWindow::Validate() )
      return false;
   // Do the choice controls:
   if (!EffectDialog::TransferDataFromWindow())
      return false;
 
   wxCommandEvent dummy;
   OnNoiseReductionChoice(dummy);
 
   return mTempSettings.Validate(m_pEffect);
}
 
void EffectNoiseReduction::Dialog::OnText(wxCommandEvent &event)
{
   int id = event.GetId();
   int idx = (id - FIRST_SLIDER - 1) / 2;
   const ControlInfo &info = controlInfo()[idx];
   wxTextCtrl* text =
      static_cast<wxTextCtrl*>(wxWindow::FindWindowById(id, this));
   wxSlider* slider =
      static_cast<wxSlider*>(wxWindow::FindWindowById(id - 1, this));
   double &field = mTempSettings.*(info.field);
 
   text->GetValue().ToDouble(&field);
   slider->SetValue(info.SliderSetting(field));
}
 
void EffectNoiseReduction::Dialog::OnSlider(wxCommandEvent &event)
{
   int id = event.GetId();
   int idx = (id - FIRST_SLIDER) / 2;
   const ControlInfo &info = controlInfo()[idx];
   wxSlider* slider =
      static_cast<wxSlider*>(wxWindow::FindWindowById(id, this));
   wxTextCtrl* text =
      static_cast<wxTextCtrl*>(wxWindow::FindWindowById(id + 1, this));
   double &field = mTempSettings.*(info.field);
 
   field = info.Value(slider->GetValue());
   text->SetValue(info.Text(field));
}