138 lines
3.9 KiB
C++
138 lines
3.9 KiB
C++
/*
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* (Real time) Pitch shifting object implementations
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*/
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#ifndef MENGA_PITCH_SHIFTER
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#define MENGA_PITCH_SHIFTER
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#include "correlation.h"
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#include "effect.h"
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#include "sampling.h"
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#include "timestretcher.h"
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#include "fft.h"
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#include <cstdint>
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#include "common.h"
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#include "cyclequeue.h"
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#include "vecdeque.h"
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#include <vector>
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namespace Mengu {
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namespace dsp {
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class PitchShifter: public Effect {
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public:
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~PitchShifter() {}
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virtual InputDomain get_input_domain() override {
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return InputDomain::Time;
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}
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virtual void set_shift_factor(const float &factor) {
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_shift_factor = factor;
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};
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virtual std::vector<EffectPropDesc> get_property_descs() const override;
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virtual void set_property(uint32_t id, EffectPropPayload data) override;
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virtual EffectPropPayload get_property(uint32_t id) const override;
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protected:
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float _shift_factor = 1.0f;
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};
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// Shifter in the frequency domain that uses LPC to estimate formant preservation.
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class PhaseVocoderPitchShifterV2: public PitchShifter {
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public:
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PhaseVocoderPitchShifterV2();
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~PhaseVocoderPitchShifterV2();
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virtual void push_signal(const Complex *input, const uint32_t &size) override;
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virtual uint32_t pop_transformed_signal(Complex *output, const uint32_t &size) override;
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virtual uint32_t n_transformed_ready() const override;
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virtual void reset() override;
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private:
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// raw time-domain data
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VecDeque<Complex> _raw_buffer;
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// time domain data after pitch_shift
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VecDeque<Complex> _transformed_buffer;
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static constexpr uint32_t ProcSize = 1 << 9;
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static constexpr uint32_t OverlapSize = 1 << 6;
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LPC<ProcSize, 30> _lpc;
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uint32_t _samples_processed;
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};
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// Shifts by resampling a time stretcher
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class TimeStretchPitchShifter: public PitchShifter {
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public:
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TimeStretchPitchShifter(TimeStretcher *stretcher, uint32_t nchannels);
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~TimeStretchPitchShifter();
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virtual void push_signal(const Complex *input, const uint32_t &size) override;
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virtual uint32_t pop_transformed_signal(Complex *output, const uint32_t &size) override;
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virtual uint32_t n_transformed_ready() const override;
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virtual void reset() override;
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virtual void set_shift_factor(const float &factor) override;
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protected:
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float _formant_shift = 1.0f;
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private:
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static constexpr uint32_t MinResampleInputSize = 1 << 10;
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// Size of transformed buffer before we increase resampling to compensate for drift
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static constexpr uint32_t IncreaseResampleThreshold = 5000;
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static constexpr uint32_t StandardResampleThreshold = 3000;
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// raw time-domain data
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VecDeque<Complex> _raw_buffer;
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// time domain data after pitch_shift
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VecDeque<Complex> _transformed_buffer;
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LinearResampler _resampler;
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TimeStretcher *_stretcher;
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};
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/*
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class PTimeStretchPitchShifter: public PitchShifter {
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public:
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PTimeStretchPitchShifter(uint32_t nchannels);
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~PTimeStretchPitchShifter();
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virtual void push_signal(const Complex *input, const uint32_t &size) override;
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virtual uint32_t pop_transformed_signal(Complex *output, const uint32_t &size) override;
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virtual uint32_t n_transformed_ready() override;
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virtual void reset() override;
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virtual void set_shift_factor(const float &factor) override;
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private:
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static constexpr uint32_t MinResampleInputSize = 1 << 10;
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// Size of transformed buffer before we increase resampling to compensate for drift
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static constexpr uint32_t IncreaseResampleThreshold = 10000;
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static constexpr uint32_t StandardResampleThreshold = 4000;
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// raw time-domain data
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VecDeque<Complex> _raw_buffer;
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// time domain data after pitch_shift
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VecDeque<Complex> _transformed_buffer;
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LinearResampler _resampler;
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PSOLATimeStretcher _pitch_shifting_stretcher;
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};
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*/
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}; // namespace dsp
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}; // namespace Mengu
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#endif
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