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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-chorus
* Created on: 23 мар 2024 г.
*
* lsp-plugins-chorus 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-chorus 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-chorus. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_PLUGINS_CHORUS_H_
#define PRIVATE_PLUGINS_CHORUS_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/Oversampler.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 <private/meta/chorus.h>
namespace lsp
{
namespace plugins
{
/**
* Base class for the latency compensation delay
*/
class chorus: public plug::Module
{
protected:
typedef float (*mix_func_t)(float o_value, float n_value, float k);
typedef struct voice_t
{
uint32_t nPhase; // Phase shift relative to global LFO
float fNormShift; // Normalized shift
float fNormScale; // Normalized scale
float fOutPhase; // Output phase value
float fOutShift; // Output shift value
uint32_t nOutDelay; // Output delay
plug::IPort *pPhase; // Output phase
plug::IPort *pShift; // Output delay shift
plug::IPort *pDelay; // Actual delay
plug::IPort *pLfoId; // Actual LFO used (0=none, 1=first, 2=second)
} voice_t;
typedef struct lfo_t
{
uint32_t nType; // LFO type
uint32_t nPeriod; // LFO period (full, first half, second half)
float fOverlap; // LFO overlapping
float fDelay; // Delay
uint32_t nOldDelay; // Old delay
uint32_t nDelay; // Actual delay
uint32_t nOldInitPhase; // Old init phase
uint32_t nInitPhase; // Initial phase
float fIVoicePhase; // Inter-voice phase
float fIChanPhase; // Inter-channel phase
float fArg[2]; // LFO arguments
uint32_t nVoices; // Number of active voices
dspu::lfo::function_t pFunc; // LFO function
float *vLfoMesh; // LFO mesh amplitude data
voice_t *vVoices; // Pointer to first voice stored in array
bool bSyncMesh; // Need to synchronize mesh with UI
plug::IPort *pType; // LFO type
plug::IPort *pPeriod; // LFO period
plug::IPort *pOverlap; // Overlap
plug::IPort *pDelay; // Delay
plug::IPort *pInitPhase; // Initial phase
plug::IPort *pIVoicePhase; // Inter-voice 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::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
dspu::Equalizer sEq; // Equalizer for processed signal
// 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
} channel_t;
protected:
uint32_t nChannels; // Number of channels
uint32_t nLfo; // Number of LFO used (1 or 2)
dspu::Toggle sReset; // Reset toggle
channel_t *vChannels; // Delay channels
voice_t *vVoices; // Voices
lfo_t vLfo[2]; // Low-frequency oscillators
float *vBuffer; // Temporary buffer for processing
float *vLfoPhase; // LFO phase
uint32_t nRealSampleRate; // Real sample rate after oversampling
uint32_t nPhase; // Current base LFO phase
uint32_t nOldPhaseStep; // Old phase increment
uint32_t nPhaseStep; // Phase increment
uint32_t nVoices; // Number of voices
uint32_t nCrossfade; // Cross-fade threshold
float fCrossfade; // Cross-fade coefficient
mix_func_t pCrossfadeFunc; // Cross-fade function
float fDepth; // Depth
uint32_t nOldDepth; // Old Depth
uint32_t nDepth; // Old Depth
float fRate; // Rate
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 fOldFeedDrive; // Old feed-back drive
float fFeedDrive; // Feedback drive
float fOldFeedDelay; // Old feedback delay
float fFeedDelay; // Feed-back delay
bool bMS; // Mid/Side mode
bool bMono; // Mono mode
bool bUpdateVoices; // Need voices update flag
plug::IPort *pBypass; // Bypass switch
plug::IPort *pMono; // Mono compatibility test
plug::IPort *pMS; // Mid/Side switch
plug::IPort *pInvPhase; // Phase inverse
plug::IPort *pOversampling; // Oversampling
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 *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 *pVoices; // Number of voices
plug::IPort *pDepth; // Depth
plug::IPort *pCrossfade; // Crossfade length
plug::IPort *pCrossfadeType; // Crossfade type
plug::IPort *pLfo2Enable; // Enable second LFO
plug::IPort *pFeedOn; // Enable feedback
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 *pDryGain; // Dry gain
plug::IPort *pWetGain; // Wet gain
plug::IPort *pDryWet; // Dry/wet balance
plug::IPort *pOutGain; // Output gain
uint8_t *pData; // Allocated data
protected:
static dspu::lfo::function_t all_lfo_functions[];
static dspu::over_mode_t all_oversampling_modes[];
protected:
static inline uint32_t phase_to_int(float phase);
protected:
void do_destroy();
public:
explicit chorus(const meta::plugin_t *meta);
chorus (const chorus &) = delete;
chorus (chorus &&) = delete;
virtual ~chorus() override;
chorus & operator = (const chorus &) = delete;
chorus & operator = (chorus &&) = 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 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_CHORUS_H_ */
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