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43 lines
1.2 KiB
43 lines
1.2 KiB
#include "../utility/dsp.h"
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#include "sampleratereducer.h"
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#include <math.h>
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using namespace daisysp;
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void SampleRateReducer::Init()
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{
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frequency_ = .2f;
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phase_ = 0.0f;
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sample_ = 0.0f;
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next_sample_ = 0.0f;
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previous_sample_ = 0.0f;
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}
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float SampleRateReducer::Process(float in)
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{
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float this_sample = next_sample_;
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next_sample_ = 0.f;
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phase_ += frequency_;
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if(phase_ >= 1.0f)
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{
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phase_ -= 1.0f;
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float t = phase_ / frequency_;
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// t = 0: the transition occurred right at this sample.
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// t = 1: the transition occurred at the previous sample.
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// Use linear interpolation to recover the fractional sample.
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float new_sample
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= previous_sample_ + (in - previous_sample_) * (1.0f - t);
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float discontinuity = new_sample - sample_;
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this_sample += discontinuity * ThisBlepSample(t);
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next_sample_ = discontinuity * NextBlepSample(t);
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sample_ = new_sample;
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}
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next_sample_ += sample_;
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previous_sample_ = in;
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return this_sample;
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}
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void SampleRateReducer::SetFreq(float frequency)
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{
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frequency_ = fclamp(frequency, 0.f, 1.f);
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}
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