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