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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-limiter
* Created on: 3 авг. 2021 г.
*
* lsp-plugins-limiter 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-limiter 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-limiter. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef PRIVATE_PLUGINS_LIMITER_H_
#define PRIVATE_PLUGINS_LIMITER_H_
#include <lsp-plug.in/plug-fw/plug.h>
#include <lsp-plug.in/plug-fw/core/IDBuffer.h>
#include <lsp-plug.in/dsp-units/ctl/Blink.h>
#include <lsp-plug.in/dsp-units/ctl/Bypass.h>
#include <lsp-plug.in/dsp-units/dynamics/Limiter.h>
#include <lsp-plug.in/dsp-units/util/Delay.h>
#include <lsp-plug.in/dsp-units/util/Dither.h>
#include <lsp-plug.in/dsp-units/util/MeterGraph.h>
#include <lsp-plug.in/dsp-units/util/Oversampler.h>
#include <lsp-plug.in/dsp-units/util/Sidechain.h>
#include <private/meta/limiter.h>
namespace lsp
{
namespace plugins
{
/**
* Limiter Plugin Series
*/
class limiter: public plug::Module
{
protected:
enum sc_graph_t
{
G_IN,
G_OUT,
G_SC,
G_GAIN,
G_TOTAL
};
enum sc_mode_t
{
SCM_INTERNAL,
SCM_EXTERNAL,
SCM_LINK,
};
typedef struct premix_t
{
float fInToSc; // Input -> Sidechain mix
float fInToLink; // Input -> Link mix
float fLinkToIn; // Link -> Input mix
float fLinkToSc; // Link -> Sidechain mix
float fScToIn; // Sidechain -> Input mix
float fScToLink; // Sidechain -> Link mix
float *vIn[2]; // Input buffer
float *vOut[2]; // Output buffer
float *vSc[2]; // Sidechain buffer
float *vLink[2]; // Link buffer
float *vTmpIn[2]; // Replacement buffer for input
float *vTmpLink[2]; // Replacement buffer for link
float *vTmpSc[2]; // Replacement buffer for sidechain
plug::IPort *pInToSc; // Input -> Sidechain mix
plug::IPort *pInToLink; // Input -> Link mix
plug::IPort *pLinkToIn; // Link -> Input mix
plug::IPort *pLinkToSc; // Link -> Sidechain mix
plug::IPort *pScToIn; // Sidechain -> Input mix
plug::IPort *pScToLink; // Sidechain -> Link mix
} premix_t;
typedef struct channel_t
{
dspu::Bypass sBypass; // Bypass
dspu::Oversampler sOver; // Oversampler object for signal
dspu::Oversampler sScOver; // Sidechain oversampler object for signal
dspu::Limiter sLimit; // Limiter
dspu::Delay sDataDelay; // Input signal delay
dspu::Delay sDryDelay; // Dry delay
dspu::MeterGraph sGraph[G_TOTAL]; // Input meter graph
dspu::Blink sBlink; // Gain blink
float *vIn; // Input data
float *vSc; // Sidechain data
float *vShmIn; // Shared memory input
float *vOut; // Output data
float *vDataBuf; // Audio data buffer (oversampled)
float *vScBuf; // Sidechain buffer
float *vGainBuf; // Applying gain buffer
float *vOutBuf; // Output buffer
bool bVisible[G_TOTAL]; // Input visibility
bool bOutVisible; // Output visibility
bool bGainVisible; // Gain visibility
bool bScVisible; // Sidechain visibility
plug::IPort *pIn; // Input port
plug::IPort *pOut; // Output port
plug::IPort *pSc; // Sidechain port
plug::IPort *pShmIn; // Sidechain port
plug::IPort *pVisible[G_TOTAL]; // Input visibility
plug::IPort *pGraph[G_TOTAL]; // History graphs
plug::IPort *pMeter[G_TOTAL]; // Meters
} channel_t;
protected:
uint32_t nChannels; // Number of channels
bool bSidechain; // Sidechain presence flag
bool bPause; // Pause button
bool bClear; // Clear button
bool bScListen; // Sidechain listen
channel_t *vChannels; // Audio channels
float *vTime; // Time points buffer
float *vIDisplay; // Buffer for inline display
uint32_t nScMode; // Sidechain mode
float fInGain; // Input gain
float fOutGain; // Output gain
float fPreamp; // Sidechain pre-amplification
float fStereoLink; // Stereo linking
core::IDBuffer *pIDisplay; // Inline display buffer
bool bUISync; // Synchronize with UI
dspu::Dither sDither; // Dither
premix_t sPremix; // Premix
plug::IPort *pBypass; // Bypass port
plug::IPort *pInGain; // Input gain
plug::IPort *pOutGain; // Output gain
plug::IPort *pPreamp; // Sidechain pre-amplification
plug::IPort *pAlrOn; // Automatic level regulation
plug::IPort *pAlrAttack; // Automatic level regulation attack
plug::IPort *pAlrRelease; // Automatic level regulation release
plug::IPort *pMode; // Operating mode
plug::IPort *pThresh; // Limiter threshold
plug::IPort *pLookahead; // Lookahead time
plug::IPort *pAttack; // Attack time
plug::IPort *pRelease; // Release time
plug::IPort *pPause; // Pause gain
plug::IPort *pClear; // Cleanup gain
plug::IPort *pScMode; // Sidechain mode
plug::IPort *pScListen; // Sidechain listen
plug::IPort *pKneeLevel; // Limiter knee level
plug::IPort *pKneeSmooth; // Limiter knee smooth
plug::IPort *pBoost; // Gain boost
plug::IPort *pOversampling; // Oversampling
plug::IPort *pDithering; // Dithering
plug::IPort *pStereoLink; // Stereo linking
uint8_t *pData; // Allocated data
protected:
static bool get_filtering(size_t mode);
static dspu::limiter_mode_t get_limiter_mode(size_t mode);
static size_t get_dithering(size_t mode);
protected:
dspu::over_mode_t get_oversampling_mode(size_t mode);
uint32_t decode_sidechain_mode(uint32_t mode);
void update_premix();
void premix_channel(uint32_t channel, size_t count);
void sync_latency();
void do_destroy();
public:
explicit limiter(const meta::plugin_t *metadata, bool sc, bool stereo);
virtual ~limiter() override;
public:
virtual void init(plug::IWrapper *wrapper, plug::IPort **ports) override;
virtual void destroy() override;
virtual void update_settings() override;
virtual void update_sample_rate(long sr) override;
virtual void ui_activated() override;
virtual void process(size_t samples) 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_LIMITER_H_ */
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