#pragma once
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#include <InterpolatedAllPassFilter.h>
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#include <LFO.h>
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/**
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* First Order All-Pass Filter with modulating delay time
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*
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*/
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template <typename SampleType>
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class ModulatedAllPassFilter
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{
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public:
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/**
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* @brief Constructor
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*/
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ModulatedAllPassFilter();
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/**
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* @brief Destructor
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*/
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~ModulatedAllPassFilter();
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/**
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* @brief Prepares object for playback
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*
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* @param sampleRate Current sampling rate
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*/
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void prepare(SampleType sampleRate);
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/**
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* @brief Sets the delay time in milliseconds
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*
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* @param delayInMs Delay time in milliseconds
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*/
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void setDelayMs(SampleType delayInMs);
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/**
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* @brief Sets the delay time in samples
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*
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* @param delayInSamples Delay time in samples
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*/
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void setDelayInSamples(SampleType delayInSamples);
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/**
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* @brief Sets the amount of feedback.
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*
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* Values must range between 0 and 1
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*
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* @param newFeedback Feedback amount
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*/
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void setFeedback(SampleType newFeedback);
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/**
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* @brief Sets the delay time modulation rate
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*
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* @param newRate New modulation rate value in Hz
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*/
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void setRate(SampleType newRate);
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/**
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* @brief Sets the delay time modulation depth
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*
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* @param newDepth New modulation depth value
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*
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* Values must range between 0.0 to 1.0
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*/
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void setDepth(SampleType newDepth);
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/**
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* @brief Sets the bounds the delay time values can modulate between
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*
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* @param newWidth New modulation width in samples
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*/
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void setWidth(SampleType newWidth);
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/**
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* @brief Processes a single sample
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*
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* @param input Input sample
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*/
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SampleType processSample(SampleType input);
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/**
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* @brief Processes a memory block that holds audio samples
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*
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* @param data Memory block start pointer
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* @param startSample Sample index to start processing from
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* @param endSample Number of samples to process
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*/
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void process(SampleType* data, int startSample, int endSample);
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private:
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SampleType doUnipolarModulationFromMin(SampleType unipolarModulatorValue, SampleType minValue, SampleType maxValue);
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SampleType bipolarToUnipolar(SampleType value);
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private:
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SampleType sampleRate;
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InterpolatedAllPassFilter<SampleType> allPassFilter;
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LFO lfo;
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SampleType delayTime {0.0}, feedback {0.0}, rate {0.0}, depth {0.0}, width {0.0};
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};
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