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/*
* Copyright (C) 2021 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2021 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-dsp-units
* Created on: 13 авг. 2021 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_TRIGGER_H_
#define LSP_PLUG_IN_DSP_UNITS_UTIL_TRIGGER_H_
#include <lsp-plug.in/dsp-units/version.h>
#include <lsp-plug.in/dsp-units/iface/IStateDumper.h>
namespace lsp
{
namespace dspu
{
enum trg_mode_t
{
TRG_MODE_SINGLE,
TRG_MODE_MANUAL,
TRG_MODE_REPEAT,
TRG_MODE_MAX
};
enum trg_type_t
{
TRG_TYPE_NONE,
TRG_TYPE_SIMPLE_RISING_EDGE,
TRG_TYPE_SIMPLE_FALLING_EDGE,
TRG_TYPE_ADVANCED_RISING_EDGE,
TRG_TYPE_ADVANCED_FALLING_EDGE,
TRG_TYPE_MAX
};
enum trg_state_t
{
TRG_STATE_WAITING,
TRG_STATE_ARMED,
TRG_STATE_FIRED,
TRG_STATE_MAX
};
class LSP_DSP_UNITS_PUBLIC Trigger
{
private:
Trigger & operator = (const Trigger &);
Trigger(const Trigger &);
protected:
// To use with Manual and Single Mode
typedef struct trg_locks_t
{
bool bSingleLock;
bool bManualAllow;
bool bManualLock;
} trg_locks_t;
typedef struct simple_trg_t
{
float fThreshold;
} simple_trg_t;
typedef struct advanced_trg_t
{
float fThreshold;
float fHysteresis;
float fLowerThreshold;
float fUpperThreshold;
bool bDisarm;
} advanced_trg_t;
private:
float fPrevious;
trg_mode_t enTriggerMode;
trg_type_t enTriggerType;
trg_state_t enTriggerState;
size_t nTriggerHold;
size_t nTriggerHoldCounter;
trg_locks_t sLocks;
simple_trg_t sSimpleTrg;
advanced_trg_t sAdvancedTrg;
bool bSync;
public:
explicit Trigger();
~Trigger();
void construct();
void destroy();
protected:
inline void set_simple_trg_threshold(float threshold)
{
sSimpleTrg.fThreshold = threshold;
}
inline void update_advanced_trg()
{
sAdvancedTrg.fLowerThreshold = sAdvancedTrg.fThreshold - sAdvancedTrg.fHysteresis;
sAdvancedTrg.fUpperThreshold = sAdvancedTrg.fThreshold + sAdvancedTrg.fHysteresis;
}
inline void set_advanced_trg_threshold(float threshold)
{
sAdvancedTrg.fThreshold = threshold;
update_advanced_trg();
}
inline void set_advanced_trg_hysteresis(float hysteresis)
{
if (hysteresis < 0.0f)
hysteresis = -hysteresis;
sAdvancedTrg.fHysteresis = hysteresis;
update_advanced_trg();
}
public:
/** Check that trigger needs settings update.
*
* @return true if trigger needs settings update.
*/
inline bool needs_update() const
{
return bSync;
}
/** This method should be called if needs_update() returns true.
* before calling process() methods.
*
*/
void update_settings();
/** Set the trigger mode.
*
* @param mode trigger mode.
*/
inline void set_trigger_mode(trg_mode_t mode)
{
if ((mode < TRG_MODE_SINGLE) || (mode >= TRG_MODE_MAX) || (enTriggerMode == mode))
return;
enTriggerMode = mode;
bSync = true;
}
/** Reset the single trigger.
*
*/
inline void reset_single_trigger()
{
sLocks.bSingleLock = false;
bSync = true;
}
/** Activate the manual trigger.
*
*/
inline void activate_manual_trigger()
{
sLocks.bManualAllow = true;
sLocks.bManualLock = false;
bSync = true;
}
/** Set the post-trigger samples. The trigger can be allowed to fire only after the post-trigger samples have elapsed.
*
* @param nSamples number of post-trigger samples.
*/
inline void set_trigger_hold_samples(size_t nSamples)
{
if (nSamples == nTriggerHold)
return;
nTriggerHold = nSamples;
nTriggerHoldCounter = 0;
}
/** Set the trigger type.
*
* @param type trigger type.
*/
inline void set_trigger_type(trg_type_t type)
{
if ((type < TRG_TYPE_NONE) || (type >= TRG_TYPE_MAX) || (enTriggerType == type))
return;
enTriggerType = type;
bSync = true;
}
/** Set the trigger threshold.
*
* @param trigger threshold.
*/
inline void set_trigger_threshold(float threshold)
{
set_simple_trg_threshold(threshold);
set_advanced_trg_threshold(threshold);
bSync = true;
}
/** Set the trigger hysteresis.
*
* @param hysteresis hysteresis.
*/
inline void set_trigger_hysteresis(float hysteresis)
{
set_advanced_trg_hysteresis(hysteresis);
bSync = true;
}
/** Return he trigger state.
*
* @return trigger state.
*/
inline trg_state_t get_trigger_state() const
{
return enTriggerState;
}
/** Feed a single sample to the trigger. Query the trigger status afterwards.
*
*/
void single_sample_processor(float value);
/**
* Dump the state
* @param dumper dumper
*/
void dump(IStateDumper *v) const;
};
}
}
#endif /* LSP_PLUG_IN_DSP_UNITS_UTIL_TRIGGER_H_ */
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