DownwardMeterValueProvider.h

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  DownwardMeterValueProvider.h
 
  Matthieu Hodgkinson
 
**********************************************************************/
#pragma once
 
#include "DynamicRangeProcessorTypes.h"
#include "MeterValueProvider.h"
#include <memory>
#include <utility>
#include <vector>
 
class DYNAMIC_RANGE_PROCESSOR_API DownwardMeterValueProvider :
    public MeterValueProvider
{
public:
   DownwardMeterValueProvider(float upperValue = 0.f);
   ~DownwardMeterValueProvider() = default;
   void Update(float value, bool alsoFiveSecondMax) override;
   float GetGlobalMax() const override;
   float GetFiveSecMax() const override;
   float GetCurrentMax() const override;
   Direction GetDirection() const override;
   bool IsInvisible() const override;
 
private:
   static constexpr auto displayDelayMs = 100;
   static constexpr auto ringBufferLength =
      displayDelayMs / compressorMeterUpdatePeriodMs;
 
   const float mUpperValue;
   float mGlobalMin;
   float mCurrentMin;
   float mFiveSecMinState;
   std::vector<std::pair<int /*tick count*/, float>> mLastFiveSeconds;
   std::array<float, ringBufferLength> mRingBuffer;
   size_t mRingBufferIndex = 0;
   int mTimerCount = 0;
};