75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
/**
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* @file formantshifter.h
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* @author 9exa
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* @brief Shifts the formants of a signal in real time.
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* @date 2023-06-08
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*/
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#ifndef MENGU_FORMANT_SHIFTER
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#define MENGU_FORMANT_SHIFTER
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#include "common.h"
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#include "correlation.h"
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#include "effect.h"
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#include "loudness.h"
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#include "vecdeque.h"
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#include <cstdint>
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namespace Mengu {
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namespace dsp {
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// shifts formants using lpc envelope estimation
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class LPCFormantShifter: public Effect {
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public:
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LPCFormantShifter();
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// tells an EffectChain what type of input the effect expects
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virtual InputDomain get_input_domain() override;
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// push new value of signal
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virtual void push_signal(const Complex *input, const uint32_t &size) override;
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// Last value of transformed signal
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virtual uint32_t pop_transformed_signal(Complex *output, const uint32_t &size) override;
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// number of samples that can be output given the current pushed signals of the Effect
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virtual uint32_t n_transformed_ready() const override;
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// resets state of effect to make it reading to take in a new sample
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virtual void reset() override;
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// The properties that this Effect exposes to be changed by GUI.
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// The index that they are put in is considered the props id
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virtual std::vector<EffectPropDesc> get_property_descs() const override;
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// Sets a property with the specified id the value declared in the payload
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virtual void set_property(uint32_t id, EffectPropPayload data) override;
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// Gets the value of a property with the specified id
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virtual EffectPropPayload get_property(uint32_t id) const override;
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private:
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VecDeque<Complex> _raw_buffer;
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VecDeque<Complex> _transformed_buffer;
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static constexpr uint32_t ProcSize = 1 << 11;
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static constexpr uint32_t HopSize = ProcSize * 4 / 5;
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static constexpr uint32_t OverlapSize = ProcSize - HopSize;
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LPC<ProcSize, 60> _lpc;
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void _shift_by_env(const Complex *input,
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Complex *output,
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const float *envelope,
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const float shift_factor);
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float _shift_factor = 1.0f;
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// Amplifies the formant_shifted samples so they have the same LUFS loudness as the raw_sample
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LoudnessNormalizer<Complex, ProcSize, 2> _loudness_norm;
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LUFSFilter _raw_sample_filter;
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LUFSFilter _shifted_sample_filter;
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};
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}
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}
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#endif |