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 "EffectUI.h"
 
#include "ShuttleGui.h"
#include "HelpSystem.h"
#include "FFT.h"
#include "Prefs.h"
#include "RealFFTf.h"
#include "../SpectrumTransformer.h"
 
#include "WaveTrack.h"
#include "AudacityMessageBox.h"
#include "../widgets/valnum.h"
 
#include <algorithm>
#include <vector>
#include <math.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>
 
// SPECTRAL_SELECTION not to affect this effect for now, as there might be no indication that it does.
// [Discussed and agreed for v2.1 by Steve, Paul, Bill].
#undef EXPERIMENTAL_SPECTRAL_EDITING
 
typedef std::vector<float> FloatVector;
 
// Define both of these to make the radio button three-way
#define RESIDUE_CHOICE
//#define ISOLATE_CHOICE
 
// Define for Attack and release controls.
// #define ATTACK_AND_RELEASE
 
// Define to expose other advanced, experimental dialog controls
//#define ADVANCED_SETTINGS
 
// Define to make the old statistical methods an available choice
//#define OLD_METHOD_AVAILABLE
 
namespace {
 
enum DiscriminationMethod : size_t {
   DM_MEDIAN,
   DM_SECOND_GREATEST,
   DM_OLD_METHOD,
 
   DM_N_METHODS,
   DM_DEFAULT_METHOD = DM_SECOND_GREATEST,
};
 
const struct DiscriminationMethodInfo {
   const TranslatableString name;
} discriminationMethodInfo[DM_N_METHODS] = {
   // Experimental only, don't need translations
      { XO("Median") },
      { XO("Second greatest") },
      { XO("Old") },
};
 
// magic number used only in the old statistics
// and the old discrimination
const float minSignalTime = 0.05f;
 
enum WindowTypes : unsigned {
   WT_RECTANGULAR_HANN = 0, // 2.0.6 behavior, requires 1/2 step
   WT_HANN_RECTANGULAR, // requires 1/2 step
   WT_HANN_HANN,        // requires 1/4 step
   WT_BLACKMAN_HANN,     // requires 1/4 step
   WT_HAMMING_RECTANGULAR, // requires 1/2 step
   WT_HAMMING_HANN, // requires 1/4 step
   // WT_HAMMING_INV_HAMMING, // requires 1/2 step
 
   WT_N_WINDOW_TYPES,
   WT_DEFAULT_WINDOW_TYPES = WT_HANN_HANN
};
 
const struct WindowTypesInfo {
   const TranslatableString name;
   unsigned minSteps;
} windowTypesInfo [WT_N_WINDOW_TYPES] = {
 
   // Experimental only, don't need translations
   { Verbatim("none, Hann (2.0.6 behavior)"),    2 },
   /* i18n-hint: Hann is a proper name */
   { Verbatim("Hann, none"),                     2 },
   /* i18n-hint: Hann is a proper name */
   { Verbatim("Hann, Hann (default)"),           4 },
   /* i18n-hint: Hann and Blackman are proper names */
   { Verbatim("Blackman, Hann"),                 4 },
   /* i18n-hint: Hamming is a proper name */
   { Verbatim("Hamming, none"),                  2 },
   /* i18n-hint: Hamming and Hann area proper names */
   { Verbatim("Hamming, Hann"),                  4 },
   /* i18n-hint: Hamming is a proper name */
   // { XO("Hamming, Reciprocal Hamming"),    2, }, // output window is special
};
 
enum {
   DEFAULT_WINDOW_SIZE_CHOICE = 8, // corresponds to 2048
   DEFAULT_STEPS_PER_WINDOW_CHOICE = 1 // corresponds to 4, minimum for WT_HANN_HANN
};
 
enum  NoiseReductionChoice {
   NRC_REDUCE_NOISE,
   NRC_ISOLATE_NOISE,
   NRC_LEAVE_RESIDUE,
};
 
} // namespace
 
//----------------------------------------------------------------------------
// EffectNoiseReduction::Statistics
//----------------------------------------------------------------------------
 
class EffectNoiseReduction::Statistics
{
public:
   Statistics(size_t spectrumSize, double rate, int windowTypes)
      : mRate{ rate }
      , mWindowSize{ (spectrumSize - 1) * 2 }
      , mWindowTypes{ windowTypes }
      , mTotalWindows{ 0 }
      , mTrackWindows{ 0 }
      , mSums( spectrumSize )
      , mMeans (spectrumSize )
#ifdef OLD_METHOD_AVAILABLE
      , mNoiseThreshold( spectrumSize )
#endif
   {}
 
   // Noise profile statistics follow
 
   double mRate; // Rate of profile track(s) -- processed tracks must match
   size_t mWindowSize;
   int mWindowTypes;
 
   unsigned mTotalWindows;
   unsigned mTrackWindows;
   FloatVector mSums;
   FloatVector mMeans;
 
#ifdef OLD_METHOD_AVAILABLE
   // Old statistics:
   FloatVector mNoiseThreshold;
#endif
};
 
//----------------------------------------------------------------------------
// EffectNoiseReduction::Settings
//----------------------------------------------------------------------------
 
// This object is the memory of the effect between uses
// (other than noise profile statistics)
class EffectNoiseReduction::Settings
{
public:
   Settings();
   ~Settings() {}
 
   int PromptUser(EffectNoiseReduction *effect, EffectSettingsAccess &access,
      wxWindow &parent, bool bHasProfile, bool bAllowTwiddleSettings);
   bool PrefsIO(bool read);
   bool Validate(EffectNoiseReduction *effect) const;
 
   size_t WindowSize() const { return 1u << (3 + mWindowSizeChoice); }
   unsigned StepsPerWindow() const { return 1u << (1 + mStepsPerWindowChoice); }
 
   bool      mDoProfile;
 
   // Stored in preferences:
 
   // Basic:
   double     mNewSensitivity;   // - log10 of a probability... yeah.
   double     mFreqSmoothingBands; // really an integer
   double     mNoiseGain;         // in dB, positive
   double     mAttackTime;        // in secs
   double     mReleaseTime;       // in secs
 
   // Advanced:
   double     mOldSensitivity;    // in dB, plus or minus
 
   // Basic:
   int        mNoiseReductionChoice;
 
   // Advanced:
   int        mWindowTypes;
   int        mWindowSizeChoice;
   int        mStepsPerWindowChoice;
   int        mMethod;
};
 
EffectNoiseReduction::Settings::Settings()
   : mDoProfile{ true }
{
   PrefsIO(true);
}
 
//----------------------------------------------------------------------------
// EffectNoiseReduction::Worker
//----------------------------------------------------------------------------
 
// This object holds information needed only during effect calculation
class EffectNoiseReduction::Worker final
   : public TrackSpectrumTransformer
{
public:
   typedef EffectNoiseReduction::Settings Settings;
   typedef  EffectNoiseReduction::Statistics Statistics;
 
   Worker(eWindowFunctions inWindowType, eWindowFunctions outWindowType,
      EffectNoiseReduction &effect, const Settings &settings,
      Statistics &statistics
#ifdef EXPERIMENTAL_SPECTRAL_EDITING
      , double f0, double f1
#endif
      );
   ~Worker();
 
   struct MyWindow : public Window
   {
      explicit MyWindow(size_t windowSize)
         : Window{ windowSize }
         , mSpectrums(windowSize / 2 + 1)
         , mGains(windowSize / 2 + 1)
      {}
      ~MyWindow() override;
 
      FloatVector mSpectrums;
      FloatVector mGains;
   };
 
   bool Process(TrackList &tracks, double mT0, double mT1);
 
protected:
   MyWindow &NthWindow(int nn) { return static_cast<MyWindow&>(Nth(nn)); }
   std::unique_ptr<Window> NewWindow(size_t windowSize) override;
   bool DoStart() override;
   static bool Processor(SpectrumTransformer &transformer);
   bool DoFinish() override;
 
private:
   void ApplyFreqSmoothing(FloatVector &gains);
   void GatherStatistics();
   inline bool Classify(unsigned nWindows, int band);
   void ReduceNoise();
   void FinishTrackStatistics();
 
private:
 
   const bool mDoProfile;
 
   EffectNoiseReduction &mEffect;
   Statistics &mStatistics;
 
   FloatVector mFreqSmoothingScratch;
   const size_t mFreqSmoothingBins;
   // When spectral selection limits the affected band:
   size_t mBinLow;  // inclusive lower bound
   size_t mBinHigh; // exclusive upper bound
 
   const int mNoiseReductionChoice;
   const int mMethod;
   const double mNewSensitivity;
 
   float     mOneBlockAttack;
   float     mOneBlockRelease;
   float     mNoiseAttenFactor;
   float     mOldSensitivityFactor;
 
   unsigned  mNWindowsToExamine;
   unsigned  mCenter;
   unsigned  mHistoryLen;
 
   // Following are for progress indicator only:
   unsigned  mProgressTrackCount = 0;
   sampleCount mLen = 0;
   sampleCount mProgressWindowCount = 0;
};
 
/****************************************************************//*****************************************************************/
 
//----------------------------------------------------------------------------
// 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()
};
 
const ComponentInterfaceSymbol EffectNoiseReduction::Symbol
{ XO("Noise Reduction") };
 
namespace{ BuiltinEffectsModule::Registration< EffectNoiseReduction > reg; }
 
EffectNoiseReduction::EffectNoiseReduction()
: mSettings(std::make_unique<EffectNoiseReduction::Settings>())
{
}
 
EffectNoiseReduction::~EffectNoiseReduction()
{
}
 
// ComponentInterface implementation
 
ComponentInterfaceSymbol EffectNoiseReduction::GetSymbol() const
{
   return Symbol;
}
 
TranslatableString EffectNoiseReduction::GetDescription() const
{
   return XO("Removes background noise such as fans, tape noise, or hums");
}
 
// EffectDefinitionInterface implementation
 
EffectType EffectNoiseReduction::GetType() const
{
   return EffectTypeProcess;
}
 
 
int EffectNoiseReduction::ShowHostInterface(EffectPlugin &,
   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 mSettings->PromptUser(this, access, parent,
      bool(mStatistics), IsBatchProcessing());
}
 
int EffectNoiseReduction::Settings::PromptUser(EffectNoiseReduction *effect,
   EffectSettingsAccess &access, wxWindow &parent,
   bool bHasProfile, bool bAllowTwiddleSettings)
{
   EffectNoiseReduction::Dialog dlog(effect, access,
      this, &parent, bHasProfile, bAllowTwiddleSettings);
 
   dlog.CentreOnParent();
   dlog.ShowModal();
 
   const auto returnCode = dlog.GetReturnCode();
   if (!returnCode)
      return 0;
 
   *this = dlog.GetTempSettings();
   mDoProfile = (returnCode == 1);
 
   if (!PrefsIO(false))
      return 0;
   return returnCode;
}
 
namespace {
   template <typename StructureType, typename FieldType>
   struct PrefsTableEntry {
      typedef FieldType (StructureType::*MemberPointer);
 
      MemberPointer field;
      const wxChar *name;
      FieldType defaultValue;
   };
 
   template <typename StructureType, typename FieldType>
   void readPrefs(
      StructureType *structure, const wxString &prefix,
      const PrefsTableEntry<StructureType, FieldType> *fields, size_t numFields)
   {
      for (size_t ii = 0; ii < numFields; ++ii) {
         const PrefsTableEntry<StructureType, FieldType> &entry = fields[ii];
         gPrefs->Read(prefix + entry.name, &(structure->*(entry.field)),
            entry.defaultValue);
      }
   }
 
   template <typename StructureType, typename FieldType>
   void writePrefs(
      const StructureType *structure, const wxString &prefix,
      const PrefsTableEntry<StructureType, FieldType> *fields, size_t numFields)
   {
      for (size_t ii = 0; ii < numFields; ++ii) {
         const PrefsTableEntry<StructureType, FieldType> &entry = fields[ii];
         gPrefs->Write(prefix + entry.name, structure->*(entry.field));
      }
   }
}
 
bool EffectNoiseReduction::Settings::PrefsIO(bool read)
{
   static const double DEFAULT_OLD_SENSITIVITY = 0.0;
 
   static const PrefsTableEntry<Settings, double> doubleTable[] = {
         { &Settings::mNewSensitivity, wxT("Sensitivity"), 6.0 },
         { &Settings::mNoiseGain, wxT("Gain"), 6.0 },
         { &Settings::mAttackTime, wxT("AttackTime"), 0.02 },
         { &Settings::mReleaseTime, wxT("ReleaseTime"), 0.10 },
         { &Settings::mFreqSmoothingBands, wxT("FreqSmoothing"), 6.0 },
 
         // Advanced settings
         { &Settings::mOldSensitivity, wxT("OldSensitivity"), DEFAULT_OLD_SENSITIVITY },
   };
   static auto doubleTableSize = sizeof(doubleTable) / sizeof(doubleTable[0]);
 
   static const PrefsTableEntry<Settings, int> intTable[] = {
         { &Settings::mNoiseReductionChoice, wxT("ReductionChoice"), NRC_REDUCE_NOISE },
 
         // Advanced settings
         { &Settings::mWindowTypes, wxT("WindowTypes"), WT_DEFAULT_WINDOW_TYPES },
         { &Settings::mWindowSizeChoice, wxT("WindowSize"), DEFAULT_WINDOW_SIZE_CHOICE },
         { &Settings::mStepsPerWindowChoice, wxT("StepsPerWindow"), DEFAULT_STEPS_PER_WINDOW_CHOICE },
         { &Settings::mMethod, wxT("Method"), DM_DEFAULT_METHOD },
   };
   static auto intTableSize = sizeof(intTable) / sizeof(intTable[0]);
 
   static const wxString prefix(wxT("/Effects/NoiseReduction/"));
 
   if (read) {
      readPrefs(this, prefix, doubleTable, doubleTableSize);
      readPrefs(this, prefix, intTable, intTableSize);
 
      // Ignore preferences for unavailable options.
#if !(defined(RESIDUE_CHOICE) || defined (ISOLATE_CHOICE))
      mNoiseReductionChoice == NRC_REDUCE_NOISE;
#elif !(defined(RESIDUE_CHOICE))
      if (mNoiseReductionChoice == NRC_LEAVE_RESIDUE)
         mNoiseReductionChoice = NRC_ISOLATE_NOISE;
#elif !(defined(ISOLATE_CHOICE))
      if (mNoiseReductionChoice == NRC_ISOLATE_NOISE)
         mNoiseReductionChoice = NRC_LEAVE_RESIDUE;
#endif
 
#ifndef ADVANCED_SETTINGS
      // Initialize all hidden advanced settings to defaults.
      mWindowTypes = WT_DEFAULT_WINDOW_TYPES;
      mWindowSizeChoice = DEFAULT_WINDOW_SIZE_CHOICE;
      mStepsPerWindowChoice = DEFAULT_STEPS_PER_WINDOW_CHOICE;
      mMethod = DM_DEFAULT_METHOD;
      mOldSensitivity = DEFAULT_OLD_SENSITIVITY;
#endif
 
#ifndef OLD_METHOD_AVAILABLE
      if (mMethod == DM_OLD_METHOD)
         mMethod = DM_DEFAULT_METHOD;
#endif
 
      return true;
   }
   else {
      writePrefs(this, prefix, doubleTable, doubleTableSize);
      writePrefs(this, prefix, intTable, intTableSize);
      return gPrefs->Flush();
   }
}
 
bool EffectNoiseReduction::Settings::Validate(EffectNoiseReduction *effect) const
{
   if (StepsPerWindow() < windowTypesInfo[mWindowTypes].minSteps) {
      EffectUIServices::DoMessageBox(*effect,
         XO("Steps per block are too few for the window types.") );
      return false;
   }
 
   if (StepsPerWindow() > WindowSize()) {
      EffectUIServices::DoMessageBox(*effect,
         XO("Steps per block cannot exceed the window size.") );
      return false;
   }
 
   if (mMethod == DM_MEDIAN && StepsPerWindow() > 4) {
      EffectUIServices::DoMessageBox(*effect,
         XO(
"Median method is not implemented for more than four steps per window.") );
      return false;
   }
 
   return true;
}
 
auto EffectNoiseReduction::Worker::NewWindow(size_t windowSize)
   -> std::unique_ptr<Window>
{
   return std::make_unique<MyWindow>(windowSize);
}
 
EffectNoiseReduction::Worker::MyWindow::~MyWindow()
{
}
 
bool EffectNoiseReduction::Process(EffectInstance &, EffectSettings &)
{
   // This same code will either reduce noise or profile it
 
   this->CopyInputTracks(); // Set up mOutputTracks.
 
   auto track = * (mOutputTracks->Selected< const WaveTrack >()).begin();
   if (!track)
      return false;
 
   // Initialize statistics if gathering them, or check for mismatched (advanced)
   // settings if reducing noise.
   if (mSettings->mDoProfile) {
      size_t spectrumSize = 1 + mSettings->WindowSize() / 2;
      mStatistics = std::make_unique<Statistics>
         (spectrumSize, track->GetRate(), mSettings->mWindowTypes);
   }
   else if (mStatistics->mWindowSize != mSettings->WindowSize()) {
      // possible only with advanced settings
      EffectUIServices::DoMessageBox(*this,
         XO("You must specify the same window size for steps 1 and 2.") );
      return false;
   }
   else if (mStatistics->mWindowTypes != mSettings->mWindowTypes) {
      // A warning only
      EffectUIServices::DoMessageBox(*this,
         XO("Warning: window types are not the same as for profiling.") );
   }
 
   eWindowFunctions inWindowType, outWindowType;
   switch (mSettings->mWindowTypes) {
   case WT_RECTANGULAR_HANN:
      inWindowType = eWinFuncRectangular;
      outWindowType = eWinFuncHann;
      break;
   case WT_HANN_RECTANGULAR:
      inWindowType = eWinFuncHann;
      outWindowType = eWinFuncRectangular;
      break;
   case WT_BLACKMAN_HANN:
      inWindowType = eWinFuncBlackman;
      outWindowType = eWinFuncHann;
      break;
   case WT_HAMMING_RECTANGULAR:
      inWindowType = eWinFuncHamming;
      outWindowType = eWinFuncRectangular;
      break;
   case WT_HAMMING_HANN:
      inWindowType = eWinFuncHamming;
      outWindowType = eWinFuncHann;
      break;
   default:
      wxASSERT(false);
      [[fallthrough]] ;
   case WT_HANN_HANN:
      inWindowType = outWindowType = eWinFuncHann;
      break;
   }
   Worker worker{ inWindowType, outWindowType,
      *this, *mSettings, *mStatistics
#ifdef EXPERIMENTAL_SPECTRAL_EDITING
      , mF0, mF1
#endif
   };
   bool bGoodResult = worker.Process(*mOutputTracks, mT0, mT1);
   if (mSettings->mDoProfile) {
      if (bGoodResult)
         mSettings->mDoProfile = false; // So that "repeat last effect" will reduce noise
      else
         mStatistics.reset(); // So that profiling must be done again before noise reduction
   }
   this->ReplaceProcessedTracks(bGoodResult);
   return bGoodResult;
}
 
EffectNoiseReduction::Worker::~Worker()
{
}
 
bool EffectNoiseReduction::Worker::Process(
   TrackList &tracks, double inT0, double inT1)
{
   mProgressTrackCount = 0;
   for ( auto track : tracks.Selected< WaveTrack >() ) {
      mProgressWindowCount = 0;
      if (track->GetRate() != mStatistics.mRate) {
         if (mDoProfile)
            EffectUIServices::DoMessageBox(mEffect,
               XO("All noise profile data must have the same sample rate.") );
         else
            EffectUIServices::DoMessageBox(mEffect,
               XO(
"The sample rate of the noise profile must match that of the sound to be processed.") );
         return false;
      }
 
      double trackStart = track->GetStartTime();
      double trackEnd = track->GetEndTime();
      double t0 = std::max(trackStart, inT0);
      double t1 = std::min(trackEnd, inT1);
 
      if (t1 > t0) {
         auto start = track->TimeToLongSamples(t0);
         auto end = track->TimeToLongSamples(t1);
         const auto len = end - start;
         mLen = len;
         const auto extra = (mStepsPerWindow - 1) * mStepSize;
         // Adjust denominator for presence or absence of padding,
         // which makes the number of windows visited either more or less
         // than the number of window steps in the data.
         if (mDoProfile)
            mLen -= extra;
         else
            mLen += extra;
 
         if (!TrackSpectrumTransformer::Process(
            Processor, track, mHistoryLen, start, len ))
            return false;
      }
      ++mProgressTrackCount;
   }
 
   if (mDoProfile) {
      if (mStatistics.mTotalWindows == 0) {
         EffectUIServices::DoMessageBox(mEffect,
            XO("Selected noise profile is too short."));
         return false;
      }
   }
 
   return true;
}
 
void EffectNoiseReduction::Worker::ApplyFreqSmoothing(FloatVector &gains)
{
   // Given an array of gain mutipliers, average them
   // GEOMETRICALLY.  Don't multiply and take nth root --
   // that may quickly cause underflows.  Instead, average the logs.
 
   if (mFreqSmoothingBins == 0)
      return;
 
   {
      auto pScratch = mFreqSmoothingScratch.data();
      std::fill(pScratch, pScratch + mSpectrumSize, 0.0f);
   }
 
   for (size_t ii = 0; ii < mSpectrumSize; ++ii)
      gains[ii] = log(gains[ii]);
 
   // ii must be signed
   for (int ii = 0; ii < (int)mSpectrumSize; ++ii) {
      const int j0 = std::max(0, ii - (int)mFreqSmoothingBins);
      const int j1 = std::min(mSpectrumSize - 1, ii + mFreqSmoothingBins);
      for(int jj = j0; jj <= j1; ++jj) {
         mFreqSmoothingScratch[ii] += gains[jj];
      }
      mFreqSmoothingScratch[ii] /= (j1 - j0 + 1);
   }
 
   for (size_t ii = 0; ii < mSpectrumSize; ++ii)
      gains[ii] = exp(mFreqSmoothingScratch[ii]);
}
 
EffectNoiseReduction::Worker::Worker(eWindowFunctions inWindowType,
   eWindowFunctions outWindowType,
   EffectNoiseReduction &effect,
   const Settings &settings, Statistics &statistics
#ifdef EXPERIMENTAL_SPECTRAL_EDITING
   , double f0, double f1
#endif
)
: TrackSpectrumTransformer{ !settings.mDoProfile, inWindowType, outWindowType,
   settings.WindowSize(), settings.StepsPerWindow(),
   !settings.mDoProfile, !settings.mDoProfile
}
, mDoProfile{ settings.mDoProfile }
 
, mEffect{ effect }
, mStatistics{ statistics }
 
, mFreqSmoothingScratch( mSpectrumSize )
, mFreqSmoothingBins{ size_t(std::max(0.0, settings.mFreqSmoothingBands)) }
, mBinLow{ 0 }
, mBinHigh{ mSpectrumSize }
 
, mNoiseReductionChoice{ settings.mNoiseReductionChoice }
, mMethod{ settings.mMethod }
 
// Sensitivity setting is a base 10 log, turn it into a natural log
, mNewSensitivity{ settings.mNewSensitivity * log(10.0) }
{
   const auto sampleRate = mStatistics.mRate;
 
#ifdef EXPERIMENTAL_SPECTRAL_EDITING
   {
      // mBinLow is inclusive, mBinHigh is exclusive, of
      // the range of frequencies to affect.  Include any
      // bin that partly overlaps the selected range of frequencies.
      const double bin = sampleRate / mWindowSize;
      if (f0 >= 0.0 )
         mBinLow = floor(f0 / bin);
      if (f1 >= 0.0)
         mBinHigh = ceil(f1 / bin);
   }
#endif
 
   const double noiseGain = -settings.mNoiseGain;
   const unsigned nAttackBlocks = 1 + (int)(settings.mAttackTime * sampleRate / mStepSize);
   const unsigned nReleaseBlocks = 1 + (int)(settings.mReleaseTime * sampleRate / mStepSize);
   // Applies to amplitudes, divide by 20:
   mNoiseAttenFactor = DB_TO_LINEAR(noiseGain);
   // Apply to gain factors which apply to amplitudes, divide by 20:
   mOneBlockAttack = DB_TO_LINEAR(noiseGain / nAttackBlocks);
   mOneBlockRelease = DB_TO_LINEAR(noiseGain / nReleaseBlocks);
   // Applies to power, divide by 10:
   mOldSensitivityFactor = pow(10.0, settings.mOldSensitivity / 10.0);
 
   mNWindowsToExamine = (mMethod == DM_OLD_METHOD)
      ? std::max(2, (int)(minSignalTime * sampleRate / mStepSize))
      : 1 + mStepsPerWindow;
 
   mCenter = mNWindowsToExamine / 2;
   wxASSERT(mCenter >= 1); // release depends on this assumption
 
   if (mDoProfile)
#ifdef OLD_METHOD_AVAILABLE
      mHistoryLen = mNWindowsToExamine;
#else
      mHistoryLen = 1;
#endif
   else {
      // Allow long enough queue for sufficient inspection of the middle
      // and for attack processing
      // See ReduceNoise()
      mHistoryLen = std::max(mNWindowsToExamine, mCenter + nAttackBlocks);
   }
}
 
bool EffectNoiseReduction::Worker::DoStart()
{
   for (size_t ii = 0, nn = TotalQueueSize(); ii < nn; ++ii) {
      MyWindow &record = NthWindow(ii);
      std::fill(record.mSpectrums.begin(), record.mSpectrums.end(), 0.0);
      std::fill(record.mGains.begin(), record.mGains.end(), mNoiseAttenFactor);
   }
   return TrackSpectrumTransformer::DoStart();
}
 
bool EffectNoiseReduction::Worker::Processor(SpectrumTransformer &transformer)
{
   auto &worker = static_cast<Worker &>(transformer);
   // Compute power spectrum in the newest window
   {
      MyWindow &record = worker.NthWindow(0);
      float *pSpectrum = &record.mSpectrums[0];
      const double dc = record.mRealFFTs[0];
      *pSpectrum++ = dc * dc;
      float *pReal = &record.mRealFFTs[1], *pImag = &record.mImagFFTs[1];
      for (size_t nn = worker.mSpectrumSize - 2; nn--;) {
         const double re = *pReal++, im = *pImag++;
         *pSpectrum++ = re * re + im * im;
      }
      const double nyquist = record.mImagFFTs[0];
      *pSpectrum = nyquist * nyquist;
   }
 
   if (worker.mDoProfile)
      worker.GatherStatistics();
   else
      worker.ReduceNoise();
 
   // Update the Progress meter, let user cancel
   return !worker.mEffect.TrackProgress(worker.mProgressTrackCount,
      std::min(1.0,
         ((++worker.mProgressWindowCount).as_double() * worker.mStepSize)
            / worker.mLen.as_double()));
}
 
void EffectNoiseReduction::Worker::FinishTrackStatistics()
{
   const auto windows = mStatistics.mTrackWindows;
 
   // Combine averages in case of multiple profile tracks.
   if (windows) {
      const auto multiplier = mStatistics.mTotalWindows;
      const auto denom = windows + multiplier;
      for (size_t ii = 0, nn = mStatistics.mMeans.size(); ii < nn; ++ii) {
         auto &mean = mStatistics.mMeans[ii];
         auto &sum = mStatistics.mSums[ii];
         mean = (mean * multiplier + sum) / denom;
         // Reset for next track
         sum = 0;
      }
      // Reset for next track
      mStatistics.mTrackWindows = 0;
      mStatistics.mTotalWindows = denom;
   }
}
 
void EffectNoiseReduction::Worker::GatherStatistics()
{
   ++mStatistics.mTrackWindows;
 
   {
      // NEW statistics
      auto pPower = NthWindow(0).mSpectrums.data();
      auto pSum = mStatistics.mSums.data();
      for (size_t jj = 0; jj < mSpectrumSize; ++jj) {
         *pSum++ += *pPower++;
      }
   }
 
#ifdef OLD_METHOD_AVAILABLE
   // The noise threshold for each frequency is the maximum
   // level achieved at that frequency for a minimum of
   // mMinSignalBlocks blocks in a row - the max of a min.
 
   auto finish = mHistoryLen;
 
   {
      // old statistics
      auto pPower = NthWindow(0).mSpectrums.data();
      auto pThreshold = mStatistics.mNoiseThreshold.data();
      for (size_t jj = 0; jj < mSpectrumSize; ++jj) {
         float min = *pPower++;
         for (unsigned ii = 1; ii < finish; ++ii)
            min = std::min(min, NthWindow(ii).mSpectrums[jj]);
         *pThreshold = std::max(*pThreshold, min);
         ++pThreshold;
      }
   }
#endif
}
 
// Return true iff the given band of the "center" window looks like noise.
// Examine the band in a few neighboring windows to decide.
inline
bool EffectNoiseReduction::Worker::Classify(unsigned nWindows, int band)
{
   switch (mMethod) {
#ifdef OLD_METHOD_AVAILABLE
   case DM_OLD_METHOD:
      {
         float min = NthWindow(0).mSpectrums[band];
         for (unsigned ii = 1; ii < nWindows; ++ii)
            min = std::min(min, NthWindow(ii).mSpectrums[band]);
         return
            min <= mOldSensitivityFactor * mStatistics.mNoiseThreshold[band];
      }
#endif
   // New methods suppose an exponential distribution of power values
   // in the noise; NEW sensitivity (which is nonnegative) is meant to be
   // the negative of a log of probability (so the log is nonpositive)
   // that noise strays above the threshold.  Call that probability
   // 1 - F.  The quantile function of an exponential distribution is
   // - log (1 - F) * mean.  Thus simply multiply mean by sensitivity
   // to get the threshold.
   case DM_MEDIAN:
      // This method examines the window and all other windows
      // whose centers lie on or between its boundaries, and takes a median, to
      // avoid being fooled by up and down excursions into
      // either the mistake of classifying noise as not noise
      // (leaving a musical noise chime), or the opposite
      // (distorting the signal with a drop out).
      if (nWindows <= 3)
         // No different from second greatest.
         goto secondGreatest;
      else if (nWindows <= 5)
      {
         float greatest = 0.0, second = 0.0, third = 0.0;
         for (unsigned ii = 0; ii < nWindows; ++ii) {
            const float power = NthWindow(ii).mSpectrums[band];
            if (power >= greatest)
               third = second, second = greatest, greatest = power;
            else if (power >= second)
               third = second, second = power;
            else if (power >= third)
               third = power;
         }
         return third <= mNewSensitivity * mStatistics.mMeans[band];
      }
      else {
         // not implemented
         wxASSERT(false);
         return true;
      }
   secondGreatest:
   case DM_SECOND_GREATEST:
      {
         // This method just throws out the high outlier.  It
         // should be less prone to distortions and more prone to
         // chimes.
         float greatest = 0.0, second = 0.0;
         for (unsigned ii = 0; ii < nWindows; ++ii) {
            const float power = NthWindow(ii).mSpectrums[band];
            if (power >= greatest)
               second = greatest, greatest = power;
            else if (power >= second)
               second = power;
         }
         return second <= mNewSensitivity * mStatistics.mMeans[band];
      }
   default:
      wxASSERT(false);
      return true;
   }
}
 
void EffectNoiseReduction::Worker::ReduceNoise()
{
   auto historyLen = CurrentQueueSize();
   auto nWindows = std::min<unsigned>(mNWindowsToExamine, historyLen);
 
   if (mNoiseReductionChoice != NRC_ISOLATE_NOISE)
   {
      MyWindow &record = NthWindow(0);
      // Default all gains to the reduction factor,
      // until we decide to raise some of them later
      float *pGain = &record.mGains[0];
      std::fill(pGain, pGain + mSpectrumSize, mNoiseAttenFactor);
   }
 
   // Raise the gain for elements in the center of the sliding history
   // or, if isolating noise, zero out the non-noise
   if (nWindows > mCenter)
   {
      auto pGain = NthWindow(mCenter).mGains.data();
      if (mNoiseReductionChoice == NRC_ISOLATE_NOISE) {
         // All above or below the selected frequency range is non-noise
         std::fill(pGain, pGain + mBinLow, 0.0f);
         std::fill(pGain + mBinHigh, pGain + mSpectrumSize, 0.0f);
         pGain += mBinLow;
         for (size_t jj = mBinLow; jj < mBinHigh; ++jj) {
               const bool isNoise = Classify(nWindows, jj);
            *pGain++ = isNoise ? 1.0 : 0.0;
         }
      }
      else {
         // All above or below the selected frequency range is non-noise
         std::fill(pGain, pGain + mBinLow, 1.0f);
         std::fill(pGain + mBinHigh, pGain + mSpectrumSize, 1.0f);
         pGain += mBinLow;
         for (size_t jj = mBinLow; jj < mBinHigh; ++jj) {
            const bool isNoise = Classify(nWindows, jj);
            if (!isNoise)
               *pGain = 1.0;
            ++pGain;
         }
      }
   }
 
   if (mNoiseReductionChoice != NRC_ISOLATE_NOISE)
   {
      // In each direction, define an exponential decay of gain from the
      // center; make actual gains the maximum of mNoiseAttenFactor, and
      // the decay curve, and their prior values.
 
      // First, the attack, which goes backward in time, which is,
      // toward higher indices in the queue.
      for (size_t jj = 0; jj < mSpectrumSize; ++jj) {
         for (unsigned ii = mCenter + 1; ii < historyLen; ++ii) {
            const float minimum =
               std::max(mNoiseAttenFactor,
                        NthWindow(ii - 1).mGains[jj] * mOneBlockAttack);
            float &gain = NthWindow(ii).mGains[jj];
            if (gain < minimum)
               gain = minimum;
            else
               // We can stop now, our attack curve is intersecting
               // the release curve of some window previously processed.
               break;
         }
      }
 
      // Now, release.  We need only look one window ahead.  This part will
      // be visited again when we examine the next window, and
      // carry the decay further.
      {
         auto pNextGain = NthWindow(mCenter - 1).mGains.data();
         auto pThisGain = NthWindow(mCenter).mGains.data();
         for (auto nn = mSpectrumSize; nn--;) {
            *pNextGain =
               std::max(*pNextGain,
                        std::max(mNoiseAttenFactor,
                                 *pThisGain++ * mOneBlockRelease));
            ++pNextGain;
         }
      }
   }
 
 
   if (QueueIsFull()) {
      auto &record = NthWindow(historyLen - 1);  // end of the queue
      const auto last = mSpectrumSize - 1;
 
      if (mNoiseReductionChoice != NRC_ISOLATE_NOISE)
         // Apply frequency smoothing to output gain
         // Gains are not less than mNoiseAttenFactor
         ApplyFreqSmoothing(record.mGains);
 
      // Apply gain to FFT
      {
         const float *pGain = &record.mGains[1];
         float *pReal = &record.mRealFFTs[1];
         float *pImag = &record.mImagFFTs[1];
         auto nn = mSpectrumSize - 2;
         if (mNoiseReductionChoice == NRC_LEAVE_RESIDUE) {
            for (; nn--;) {
               // Subtract the gain we would otherwise apply from 1, and
               // negate that to flip the phase.
               const double gain = *pGain++ - 1.0;
               *pReal++ *= gain;
               *pImag++ *= gain;
            }
            record.mRealFFTs[0] *= (record.mGains[0] - 1.0);
            // The Fs/2 component is stored as the imaginary part of the DC component
            record.mImagFFTs[0] *= (record.mGains[last] - 1.0);
         }
         else {
            for (; nn--;) {
               const double gain = *pGain++;
               *pReal++ *= gain;
               *pImag++ *= gain;
            }
            record.mRealFFTs[0] *= record.mGains[0];
            // The Fs/2 component is stored as the imaginary part of the DC component
            record.mImagFFTs[0] *= record.mGains[last];
         }
      }
   }
}
 
bool EffectNoiseReduction::Worker::DoFinish()
{
   if (mDoProfile)
      FinishTrackStatistics();
   return TrackSpectrumTransformer::DoFinish();
}
 
//----------------------------------------------------------------------------
// 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,
         0.0, 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;
 
   m_pEffect->Preview(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));
}