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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: 14 сент. 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_UTIL_SIDECHAIN_H_
#define LSP_PLUG_IN_DSP_UNITS_UTIL_SIDECHAIN_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
#include <lsp-plug.in/dsp-units/util/ShiftBuffer.h>
#include <lsp-plug.in/dsp-units/filters/Equalizer.h>
namespace lsp
{
namespace dspu
{
// Sidechain signal source
enum sidechain_source_t
{
SCS_MIDDLE, // Take the middle part out of the stereo signal
SCS_SIDE, // Take the side part out of the stereo signal
SCS_LEFT, // Take the left channel out of the stereo signal
SCS_RIGHT, // Take the right channel out of the stereo signal
SCS_AMIN, // Take the absolute minimum value out of the stereo signal
SCS_AMAX // Take the absolute maximum value out of the stereo signal
};
enum sidechain_mode_t
{
SCM_PEAK,
SCM_RMS,
SCM_LPF,
SCM_UNIFORM
};
enum sidechain_stereo_mode_t
{
SCSM_STEREO,
SCSM_MIDSIDE
};
class LSP_DSP_UNITS_PUBLIC Sidechain
{
private:
Sidechain & operator = (const Sidechain &);
Sidechain(const Sidechain &);
protected:
ShiftBuffer sBuffer; // Shift buffer for history
size_t nReactivity; // Reactivity (in samples)
float fReactivity; // Reactivity (in time)
float fTau; // Tau for RMS
float fRmsValue; // RMS value
size_t nSource; // Sidechain source
size_t nMode; // Sidechain mode
size_t nSampleRate; // Sample rate
size_t nRefresh; // Sidechain refresh
size_t nChannels; // Number of channels
float fMaxReactivity; // Maximum reactivity
float fGain; // Sidechain gain
bool bUpdate; // Update sidechain parameters flag
bool bMidSide; // Mid-side mode
Equalizer *pPreEq; // Pre-equalizer
protected:
void update_settings();
void refresh_processing();
bool preprocess(float *out, const float **in, size_t samples);
bool preprocess(float *out, const float *in);
void select_buffer(float **a, float **b, size_t *size);
public:
explicit Sidechain();
~Sidechain();
/**
* Construct the object
*/
void construct();
/** Initialize sidechain
*
* @param channels number of input channels, possible 1 or 2
* @param max_reactivity maximum reactivity
*/
bool init(size_t channels, float max_reactivity);
/** Destroy sidechain
*
*/
void destroy();
public:
/** Set pre-processing equalizer
*
* @param eq equalizer
*/
inline void set_pre_equalizer(Equalizer *eq) { pPreEq = eq; }
/** Set sample rate
*
* @param sr sample rate
*/
void set_sample_rate(size_t sr);
/** Set sidechain reactivity
*
* @param reactivity sidechain reactivity
*/
inline void set_reactivity(float reactivity)
{
if ((fReactivity == reactivity) ||
(reactivity <= 0.0) ||
(reactivity >= fMaxReactivity))
return;
fReactivity = reactivity;
bUpdate = true;
}
inline void set_stereo_mode(sidechain_stereo_mode_t mode)
{
bMidSide = mode == SCSM_MIDSIDE;
}
/** Set sidechain source
*
* @param source sidechain source
*/
inline void set_source(size_t source)
{
nSource = source;
}
/** Set sidechain mode
*
* @param mode sidechain mode
*/
inline void set_mode(size_t mode)
{
if (nMode == mode)
return;
fRmsValue = 0.0f;
nMode = mode;
}
/** Set-up pre-amplification gain
*
* @param gain sidechain pre-amplification gain
*/
inline void set_gain(float gain)
{
fGain = gain;
}
/** Get pre-amplification gain
*
* @return pre-amplification gain
*/
inline float get_gain() const
{
return fGain;
}
/** Process sidechain signal
*
* @param out output buffer
* @param in array of input buffers
* @param samples number of samples to process
*/
void process(float *out, const float **in, size_t samples);
/** Process sidechain signal (single sample)
*
* @param in input data array (one sample per each input channel)
*/
float process(const float *in);
/**
* Dump the state
* @param dumper dumper
*/
void dump(IStateDumper *v) const;
};
}
} /* namespace lsp */
#endif /* LSP_PLUG_IN_DSP_UNITS_UTIL_SIDECHAIN_H_ */
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