NormalizeBase.h

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  NormalizeBase.h
 
  Dominic Mazzoni
  Vaughan Johnson (Preview)
 
**********************************************************************/
#pragma once
 
#include "SettingsVisitor.h"
#include "StatefulEffect.h"
 
class WaveChannel;
 
class BUILTIN_EFFECTS_API NormalizeBase : public StatefulEffect
{
public:
   static inline NormalizeBase*
   FetchParameters(NormalizeBase& e, EffectSettings&)
   {
      return &e;
   }
   static const ComponentInterfaceSymbol Symbol;
 
   NormalizeBase();
   virtual ~NormalizeBase();
 
   // ComponentInterface implementation
 
   ComponentInterfaceSymbol GetSymbol() const override;
   TranslatableString GetDescription() const override;
   ManualPageID ManualPage() const override;
 
   // EffectDefinitionInterface implementation
 
   EffectType GetType() const override;
 
   // Effect implementation
 
   bool CheckWhetherSkipEffect(const EffectSettings& settings) const override;
   bool Process(EffectInstance& instance, EffectSettings& settings) override;
 
private:
   // NormalizeBase implementation
 
   bool ProcessOne(
      WaveChannel& track, const TranslatableString& msg, double& progress,
      float offset);
   using ProgressReport = std::function<bool(double fraction)>;
   static bool AnalyseTrack(
      const WaveChannel& track, const ProgressReport& report, bool gain,
      bool dc, double curT0, double curT1, float& offset, float& extent);
   static bool AnalyseTrackData(
      const WaveChannel& track, const ProgressReport& report, double curT0,
      double curT1, float& offset);
   static double AnalyseDataDC(float* buffer, size_t len, double sum);
   void ProcessData(float* buffer, size_t len, float offset);
 
protected:
   double mPeakLevel;
   bool mGain;
   bool mDC;
   bool mStereoInd;
 
   double mCurT0;
   double mCurT1;
   float mMult;
 
   const EffectParameterMethods& Parameters() const override;
 
   static constexpr EffectParameter PeakLevel {
      &NormalizeBase::mPeakLevel, L"PeakLevel", -1.0, -145.0, 0.0, 1
   };
   static constexpr EffectParameter RemoveDC {
      &NormalizeBase::mDC, L"RemoveDcOffset", true, false, true, 1
   };
   static constexpr EffectParameter ApplyVolume {
      &NormalizeBase::mGain, L"ApplyVolume", true, false, true, 1
   };
   static constexpr EffectParameter StereoInd {
      &NormalizeBase::mStereoInd, L"StereoIndependent", false, false, true, 1
   };
};