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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-units
* Created on: 7 нояб. 2016 г.
*
* lsp-dsp-units is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-dsp-units is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-dsp-units. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_DSP_UNITS_DYNAMICS_GATE_H_
#define LSP_PLUG_IN_DSP_UNITS_DYNAMICS_GATE_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
namespace lsp
{
namespace dspu
{
class LSP_DSP_UNITS_PUBLIC Gate
{
private:
Gate & operator = (const Gate &);
Gate(const Gate &);
protected:
typedef struct curve_t
{
float fThreshold;
float fZone;
float fZS;
float fZE;
float fZSGain;
float fZEGain;
float vHermite[4];
} curve_t;
protected:
// Parameters
curve_t sCurves[2];
float fAttack;
float fRelease;
float fTauAttack;
float fTauRelease;
float fReduction;
float fEnvelope;
// Additional parameters
size_t nSampleRate;
size_t nCurve;
bool bUpdate;
public:
explicit Gate();
~Gate();
/**
* Construct the object
*/
void construct();
/**
* Destroy the object
*/
void destroy();
public:
/** Check that some of parameters have been modified
* and we need to call update_settings();
*
* @return true if some of parameters have been modified
*/
inline bool modified() const
{
return bUpdate;
}
/** Update gate settings
*
*/
void update_settings();
/** Set threshold
*
* @param topen open curve threshold
* @param tclose close curve threshold
*
*/
inline void set_threshold(float topen, float tclose)
{
if ((topen == sCurves[0].fThreshold) && (tclose == sCurves[1].fThreshold))
return;
sCurves[0].fThreshold = topen;
sCurves[1].fThreshold = tclose;
bUpdate = true;
}
/** Set reduction
*
* @param reduction the reduction threshold
*/
inline void set_reduction(float reduction)
{
if (reduction == fReduction)
return;
fReduction = reduction;
bUpdate = true;
}
/** Set timings
*
* @param attack attack time (ms)
* @param release release time (ms)
*/
inline void set_timings(float attack, float release)
{
if ((fAttack == attack) && (fRelease == release))
return;
fAttack = attack;
fRelease = release;
bUpdate = true;
}
/** Set attack time
*
* @param attack attack time (ms)
*/
inline void set_attack(float attack)
{
if (fAttack == attack)
return;
fAttack = attack;
bUpdate = true;
}
/** Set release time
*
* @param release release time (ms)
*/
inline void set_release(float release)
{
if (fRelease == release)
return;
fRelease = release;
bUpdate = true;
}
/** Set sample rate
*
* @param sr sample rate
*/
inline void set_sample_rate(size_t sr)
{
if (sr == nSampleRate)
return;
nSampleRate = sr;
bUpdate = true;
}
/** Set reduction zone
*
* @param open open curve ratio
* @param close close curve ratio
*/
inline void set_zone(float open, float close)
{
if ((open == sCurves[0].fZone) && (close == sCurves[1].fZone))
return;
sCurves[0].fZone = open;
sCurves[1].fZone = close;
bUpdate = true;
}
/** Process sidechain signal
*
* @param out output signal gain to VCA
* @param env envelope signal of expander
* @param in sidechain signal
* @param samples number of samples to process
*/
void process(float *out, float *env, const float *in, size_t samples);
/** Process one sample of sidechain signal
*
* @param s sidechain signal
* @param out envelope signal of expander, may be NULL
* @return output signal gain to VCA
*/
float process(float *env, float s);
/** Get curve
*
* @param out output expansion value
* @param in input expansion value
* @param dots number of input dots
* @param hyst output hysteresis curve or direct curve
*/
void curve(float *out, const float *in, size_t dots, bool hyst) const;
/** Get curve point
*
* @param in input level
* @param hyst output hysteresis curve or direct curve
*/
float curve(float in, bool hyst) const;
/** Get gain amplification
*
* @param out output signal
* @param in input signal
* @param dots number of dots
* @param hyst output hysteresis amplification or direct amplification
*/
void amplification(float *out, const float *in, size_t dots, bool hyst) const;
/** Get gain amplification at current state
*
* @param in input level
*/
float amplification(float in) const;
/** Get gain amplification
*
* @param in input level
* @param hyst output hysteresis amplification or direct amplification
*/
float amplification(float in, bool hyst) const;
/**
* Dump internal state
* @param v state dumper
*/
void dump(IStateDumper *v) const;
};
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_DSP_UNITS_DYNAMICS_GATE_H_ */
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