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/*
* Copyright (C) 2024 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2024 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-plugins-flanger
* Created on: 25 нояб. 2020 г.
*
* lsp-plugins-flanger 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-plugins-flanger 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-plugins-flanger. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_PLUGINS_FLANGER_H_
#define PRIVATE_PLUGINS_FLANGER_H_
#include <lsp-plug.in/dsp-units/ctl/Bypass.h>
#include <lsp-plug.in/dsp-units/ctl/Toggle.h>
#include <lsp-plug.in/dsp-units/misc/lfo.h>
#include <lsp-plug.in/dsp-units/util/Delay.h>
#include <lsp-plug.in/dsp-units/util/RingBuffer.h>
#include <lsp-plug.in/dsp-units/util/Oversampler.h>
#include <lsp-plug.in/plug-fw/core/IDBuffer.h>
#include <lsp-plug.in/plug-fw/plug.h>
#include <private/meta/flanger.h>
namespace lsp
{
namespace plugins
{
/**
* Base class for the latency compensation delay
*/
class flanger: public plug::Module
{
private:
flanger & operator = (const flanger &);
flanger (const flanger &);
protected:
typedef float (*mix_func_t)(float o_value, float n_value, float k);
struct channel_t;
typedef struct channel_t
{
// DSP processing modules
dspu::Bypass sBypass; // Bypass
dspu::Delay sDelay; // Delay for dry signal
dspu::RingBuffer sRing; // Ring buffer for flanger effect processing
dspu::RingBuffer sFeedback; // Feedback delay buffer
dspu::Oversampler sOversampler; // Oversampler
// Parameters
uint32_t nOldPhaseShift; // Old phase shift
uint32_t nPhaseShift; // Phase shift
size_t nLfoType; // Type of LFO
size_t nLfoPeriod; // LFO period
float fLfoArg[2]; // LFO function coefficients (multiplier, adder)
dspu::lfo::function_t pLfoFunc; // LFO function
float fOutPhase; // Output phase for drawing
float fOutShift; // Output shift for drawing
bool bSyncLfo; // Synchronize LFO graph
float *vIn; // Input buffer
float *vOut; // Output buffer
float *vBuffer; // Processed signal
float *vLfoMesh; // LFO mesh amplitude data
// Input ports
plug::IPort *pIn; // Input port
plug::IPort *pOut; // Output port
// Output ports
plug::IPort *pPhase; // Current phase
plug::IPort *pLfoType; // Oscillator type
plug::IPort *pLfoPeriod; // Oscillator period
plug::IPort *pLfoShift; // LFO shift
plug::IPort *pLfoMesh; // LFO mesh
plug::IPort *pInLevel; // Input signal level
plug::IPort *pOutLevel; // Output signal level
} channel_t;
protected:
static dspu::lfo::function_t all_lfo_functions[];
static dspu::over_mode_t all_oversampling_modes[];
protected:
dspu::Toggle sReset; // Reset toggle
size_t nChannels; // Number of channels
channel_t *vChannels; // Delay channels
float *vBuffer; // Temporary buffer for audio processing
float *vLfoPhase; // LFO mesh phase data
uint32_t nOldDepthMin; // Old minimum depth
uint32_t nDepthMin; // Minimum depth value in samples
uint32_t nOldDepth; // Old depth value in samples
uint32_t nDepth; // Depth value in samples
uint32_t nInitPhase; // Initial phase
uint32_t nPhase; // Current phase value
uint32_t nOldPhaseStep; // Old phase increment
uint32_t nPhaseStep; // Phase increment
uint32_t nCrossfade; // Cross-fade threshold
float fCrossfade; // Cross-fade coefficient
mix_func_t pCrossfadeFunc; // Cross-fade function
float fOldFeedGain; // Old feedback gain
float fFeedGain; // Feed-back gain
float fOldFeedDrive; // Old feed-back drive
float fFeedDrive; // Feedback drive
float fOldFeedDelay; // Old feedback delay
float fFeedDelay; // Feed-back delay
float fOldInGain; // Old input gain
float fInGain; // Input gain
float fOldDryGain; // Old dry gain
float fDryGain; // Dry gain (unprocessed signal)
float fOldWetGain; // Old wet gain
float fWetGain; // Wet gain (processed signal)
bool bMidSide; // Mid/Side mode
bool bCustomLfo; // Custom LFO flag
bool bMono; // Mono compatibility test enabled
plug::IPort *pBypass; // Bypass
plug::IPort *pMono; // Mono compatibility test switch
plug::IPort *pRate; // Rate
plug::IPort *pFraction; // Fraction
plug::IPort *pTempo; // Tempo
plug::IPort *pTempoSync; // Tempo sync
plug::IPort *pTimeMode; // Time mode selector (rate/tempo)
plug::IPort *pCrossfade; // Crossfade amount
plug::IPort *pCrossfadeType; // Crossfade type
plug::IPort *pInitPhase; // Initial Phase
plug::IPort *pPhaseDiff; // Phase difference between left and right
plug::IPort *pReset; // Reset phase to default
plug::IPort *pMsSwitch; // Mid/Side switch
plug::IPort *pDepthMin; // Minimal depth
plug::IPort *pDepth; // Depth
plug::IPort *pSignalPhase; // Signal phase
plug::IPort *pOversampling; // Oversampling
plug::IPort *pFeedOn; // Feedback enable switch
plug::IPort *pFeedGain; // Feedback gain
plug::IPort *pFeedDrive; // Feedback drive
plug::IPort *pFeedDelay; // Feedback delay
plug::IPort *pFeedPhase; // Feedback phase
plug::IPort *pInGain; // Input gain
plug::IPort *pDry; // Dry gain
plug::IPort *pWet; // Wet gain
plug::IPort *pDryWet; // Dry/wet balance
plug::IPort *pOutGain; // Output gain
core::IDBuffer *pIDisplay; // Inline display buffer
uint8_t *pData; // Allocated data
protected:
static inline uint32_t phase_to_int(float phase);
protected:
void do_destroy();
public:
explicit flanger(const meta::plugin_t *meta);
virtual ~flanger() override;
virtual void init(plug::IWrapper *wrapper, plug::IPort **ports) override;
virtual void destroy() override;
public:
virtual void update_sample_rate(long sr) override;
virtual void update_settings() override;
virtual bool set_position(const plug::position_t *pos) override;
virtual void process(size_t samples) override;
virtual void ui_activated() override;
virtual bool inline_display(plug::ICanvas *cv, size_t width, size_t height) override;
virtual void dump(dspu::IStateDumper *v) const override;
};
} /* namespace plugins */
} /* namespace lsp */
#endif /* PRIVATE_PLUGINS_FLANGER_H_ */
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