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/*
* Copyright (C) 2025 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2025 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-plugins-phaser
* Created on: 10 мар 2025 г.
*
* lsp-plugins-phaser 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-phaser 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-phaser. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_PLUGINS_PHASER_H_
#define PRIVATE_PLUGINS_PHASER_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/filters/Equalizer.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/plug-fw/core/IDBuffer.h>
#include <lsp-plug.in/plug-fw/plug.h>
#include <lsp-plug.in/dsp/dsp.h>
#include <private/meta/phaser.h>
namespace lsp
{
namespace plugins
{
/**
* Base class for the latency compensation delay
*/
class phaser: public plug::Module
{
protected:
typedef float (*mix_func_t)(float o_value, float n_value, float k);
typedef struct filter_t
{
float sAllpass[4]; // Allpass filter data
uint32_t nPhase; // Phase shift relative to global LFO
uint32_t nActPhase; // Actual phase of LFO
float fNormShift; // Normalized shift
float fNormScale; // Normalized scale
float fOutPhase; // Output phase value
float fOutShift; // Output shift value
float fOutFreq; // Output frequency
plug::IPort *pPhase; // Output phase
plug::IPort *pShift; // Output delay shift
plug::IPort *pOutFreq; // Actual frequency
} filter_t;
typedef struct lfo_t
{
float fOverlap; // LFO overlapping
float fOldMinFreq; // Old minimum frequency
float fMinFreq; // Minimum frequency
float fOldMaxFreq; // Old maximum frequency
float fMaxFreq; // Maximum frequency
uint32_t nOldInitPhase; // Old init phase
uint32_t nInitPhase; // Initial phase
uint32_t nPhase; // Current base LFO phase
uint32_t nOldPhaseStep; // Old phase increment
uint32_t nPhaseStep; // Phase increment
float fIFilterPhase; // Inter-filter phase
float fIChanPhase; // Inter-channel phase
bool bSyncMesh; // Need to synchronize mesh with UI
plug::IPort *pOverlap; // Overlap
plug::IPort *pMinFreq; // Minimum frequency
plug::IPort *pMaxFreq; // Maximum frequency
plug::IPort *pInitPhase; // Initial phase
plug::IPort *pIFilterPhase; // Inter-filter phase
plug::IPort *pIChannelPhase; // Inter-channel phase
plug::IPort *pMesh; // Mesh data
} lfo_t;
typedef struct channel_t
{
// DSP processing modules
dspu::Bypass sBypass; // Bypass
dspu::RingBuffer sFeedback; // Feedback delay buffer
dspu::Equalizer sEq; // Equalizer for processed signal
filter_t vFilters[meta::phaser::FILTERS_MAX]; // Filters
size_t nLfoType; // Type of LFO
size_t nLfoPeriod; // LFO period
float vLfoArg[2]; // LFO function coefficients (multiplier, adder)
dspu::lfo::function_t pLfoFunc; // LFO function
float *vLfoMesh; // LFO mesh amplitude data
// Parameters
float *vIn; // Input buffer
float *vOut; // Output buffer
float *vBuffer; // Processed signal
// Data ports ports
plug::IPort *pIn; // Input port
plug::IPort *pOut; // Output port
plug::IPort *pInLevel; // Input level meter
plug::IPort *pOutLevel; // Output level meter
plug::IPort *pLfoType; // LFO type
plug::IPort *pLfoPeriod; // LFO period
} channel_t;
protected:
static dspu::lfo::function_t all_lfo_functions[];
protected:
uint32_t nChannels; // Number of channels
uint32_t nFilters; // Number of active filters
dspu::Toggle sReset; // Reset toggle
channel_t *vChannels; // Number of channels
lfo_t sLfo; // Low-frequency oscillator
float *vBuffer; // Temporary buffer for processing
float *vLfoPhase; // Buffer that stores LFO phase
float fRevSampleRate; // Reverse sample rate
float fRevQuality; // Filter reverse quality
float fRate; // Rate
float fOldDepth; // Old Depth
float fDepth; // Depth
uint32_t nCrossfade; // Cross-fade threshold
float fCrossfade; // Cross-fade coefficient
float fRevCrossfade; // Reverse cross-fade coefficient
float fOldInGain; // Old input gain
float fInGain; // Input gain
float fOldDryGain; // Old dry gain
float fDryGain; // Dry gain
float fOldWetGain; // Old wet gain
float fWetGain; // Wet gain
float fOldFeedGain; // Old feedback gain
float fFeedGain; // Feed-back gain
float fOldFeedDelay; // Old feedback delay
float fFeedDelay; // Feed-back delay
bool bMS; // Mid/Side mode
bool bMono; // Mono mode
bool bCustomLfo; // Custom LFO shape for second channel
bool bUpdateFilters; // Update filters
plug::IPort *pBypass; // Bypass switch
plug::IPort *pMono; // Mono compatibility test
plug::IPort *pMS; // Mid/Side switch
plug::IPort *pInvPhase; // Phase inverse
plug::IPort *pHpfMode; // High-pass filter mode
plug::IPort *pHpfFreq; // High-pass filter frequency
plug::IPort *pLpfMode; // Low-pass filter mode
plug::IPort *pLpfFreq; // Low-pass filter frequency
plug::IPort *pRate; // Rate
plug::IPort *pDepth; // Depth
plug::IPort *pFraction; // Time fraction
plug::IPort *pTempo; // Tempo
plug::IPort *pTempoSync; // Tempo sync
plug::IPort *pTimeMode; // Time computing method
plug::IPort *pReset; // Reset phase to initial value
plug::IPort *pFilters; // Number of filters used
plug::IPort *pFilterQuality; // Filter quality
plug::IPort *pCrossfade; // Crossfade length
plug::IPort *pFeedOn; // Enable feedback
plug::IPort *pFeedGain; // Feedback gain
plug::IPort *pFeedDelay; // Feedback delay
plug::IPort *pFeedPhase; // Feedback phase
plug::IPort *pInGain; // Input gain
plug::IPort *pDryGain; // Dry gain
plug::IPort *pWetGain; // 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);
static inline void lerp_frequencies(float *dst, float min, float max, size_t count);
protected:
inline float process_allpass(float *d, float freq, float s);
void do_destroy();
public:
explicit phaser(const meta::plugin_t *meta);
phaser(const phaser &) = delete;
phaser(phaser &&) = delete;
virtual ~phaser() override;
phaser & operator = (const phaser &) = delete;
phaser & operator = (phaser &&) = delete;
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 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_PHASER_H_ */
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