ChangeSpeedBase.h

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#pragma once
 
#include "SettingsVisitor.h"
#include "StatefulEffect.h"
 
class LabelTrack;
class WaveChannel;
 
// the standard vinyl rpm choices
// If the percent change is not one of these ratios, the choice control gets
// "n/a".
enum kVinyl
{
   kVinyl_33AndAThird = 0,
   kVinyl_45,
   kVinyl_78,
   kVinyl_NA
};
 
class BUILTIN_EFFECTS_API ChangeSpeedBase : public StatefulEffect
{
public:
   static inline ChangeSpeedBase*
   FetchParameters(ChangeSpeedBase& e, EffectSettings&)
   {
      return &e;
   }
   static const ComponentInterfaceSymbol Symbol;
 
   ChangeSpeedBase();
   virtual ~ChangeSpeedBase();
 
   // ComponentInterface implementation
 
   ComponentInterfaceSymbol GetSymbol() const override;
   TranslatableString GetDescription() const override;
   ManualPageID ManualPage() const override;
 
   // EffectDefinitionInterface implementation
 
   EffectType GetType() const override;
   OptionalMessage LoadFactoryDefaults(EffectSettings& settings) const override;
   OptionalMessage DoLoadFactoryDefaults(EffectSettings& settings);
 
   bool CheckWhetherSkipEffect(const EffectSettings& settings) const override;
   double CalcPreviewInputLength(
      const EffectSettings& settings, double previewLength) const override;
   bool Init() override;
   bool Process(EffectInstance& instance, EffectSettings& settings) override;
 
private:
   // ChangeSpeedBase implementation
 
   using Gap = std::pair<double, double>;
   using Gaps = std::vector<Gap>;
   Gaps
   FindGaps(const WaveTrack& track, const double curT0, const double curT1);
 
   bool ProcessOne(
      const WaveChannel& track, WaveChannel& outputTrack, sampleCount start,
      sampleCount end);
   bool ProcessLabelTrack(LabelTrack* t);
 
protected:
   // track related
   int mCurTrackNum;
   double mCurT0;
   double mCurT1;
 
   // control values
   double
      m_PercentChange;  // percent change to apply to tempo
                        // -100% is meaningless, but sky's the upper limit.
                        // Slider is (-100, 200], but textCtrls can set higher.
   int mFromVinyl;      // from standard vinyl speed (RPM) enum
   double mFactor;      // scale factor calculated from percent change
   double mFromLength;  // current selection length
   int mTimeCtrlFormat; // time control format index number
   double mMultiplier;
 
   bool mbLoopDetect;
 
   double mRate;
 
   // private effect parameters
   int mToVinyl;            // to standard vinyl speed (rpm)
   double mToLength;        // target length of selection
   NumericFormatID mFormat; // time control format
 
   const EffectParameterMethods& Parameters() const override;
 
   static constexpr EffectParameter Percentage {
      &ChangeSpeedBase::m_PercentChange, L"Percentage", 0.0, -99.0, 4900.0, 1
   };
};