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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: 22 янв. 2020 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_CTL_CROSSFADE_H_
#define LSP_PLUG_IN_DSP_UNITS_CTL_CROSSFADE_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 Crossfade
{
private:
Crossfade & operator = (const Crossfade &);
Crossfade(const Crossfade &);
protected:
size_t nSamples;
size_t nCounter;
float fDelta;
float fGain;
public:
explicit Crossfade();
~Crossfade();
/**
* Construct object
*/
void construct();
/**
* Destroy object
*/
void destroy();
public:
/**
* Initialize crossfade
* @param sample_rate sample rate of the signal
* @param time crossfade time, by default 5 msec
*/
void init(int sample_rate, float time = 0.005f);
/**
* Crossfade the signal
* @param dst destination buffer
* @param fade_out the signal that will fade out, may be NULL
* @param fade_in the signal that will fade in, may be NULL
* @param count number of samples to process
*/
void process(float *dst, const float *fade_out, const float *fade_in, size_t count);
/**
* Return the remaining number of samples to process
* @return the remaining number of samples to process before crossfade becomes inactive
*/
inline size_t remaining() const { return nCounter; }
/**
* Check if crossfade is currently active
* @return true if crossfade is currently active
*/
inline bool active() const { return nCounter > 0; }
/**
* Reset the crossfade state, immediately interrupt it's processing
*/
void reset();
/**
* Toggle crossfade processing
* @return true if crossfade has been toggled, false
* if crossfade is currently active
*/
bool toggle();
/**
* Dump the state
* @param dumper dumper
*/
void dump(IStateDumper *v) const;
};
} /* namespace dspu */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_DSP_UNITS_CTL_CROSSFADE_H_ */
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