#pragma once
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#include <LinearInterpolationCircularBuffer.h>
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#define FEEDBACK_LIMIT 0.99
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/**
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* First Order All-Pass Filter that utilizes linear interpolation when poping samples.
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*
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* Allows for smoother delay time changes and modulation.
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*
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*/
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template <typename SampleType>
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class InterpolatedAllPassFilter
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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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InterpolatedAllPassFilter();
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/**
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* @brief Destructor
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*/
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~InterpolatedAllPassFilter();
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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 delayInMs Delay time in samples
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*/
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void setDelaySamples(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 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 channelData 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* channelData, int startSample, int endSample);
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private:
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SampleType sampleRate;
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LinearInterpolationCircularBuffer<SampleType> circularBuffer;
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SampleType delayTime {0.0};
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SampleType feedback {0.0};
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SampleType lastOutput {0.0};
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SampleType lastInput {0.0};
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};
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