Effect.h

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/*
 * Effect.h - base class for effects
 *
 * Copyright (c) 2006-2007 Danny McRae <khjklujn/at/users.sourceforge.net>
 * Copyright (c) 2006-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
#ifndef LMMS_EFFECT_H
#define LMMS_EFFECT_H
 
#include <span>
 
#include "AudioEngine.h"
#include "AutomatableModel.h"
#include "Engine.h"
#include "Plugin.h"
#include "TempoSyncKnobModel.h"
 
namespace lmms
{
 
class AudioBuffer;
class EffectChain;
class EffectControls;
 
namespace gui
{
 
class EffectView;
 
} // namespace gui
 
 
class LMMS_EXPORT Effect : public Plugin
{
        Q_OBJECT
public:
        Effect( const Plugin::Descriptor * _desc,
                        Model * _parent,
                        const Descriptor::SubPluginFeatures::Key * _key );
 
        void saveSettings( QDomDocument & _doc, QDomElement & _parent ) override;
        void loadSettings( const QDomElement & _this ) override;
 
        inline QString nodeName() const override
        {
                return "effect";
        }

        bool processAudioBuffer(AudioBuffer& inOut);
 
        inline bool isOkay() const
        {
                return m_okay;
        }
 
        inline void setOkay( bool _state )
        {
                m_okay = _state;
        }

        bool isCorrupted() const { return m_corrupted.load(std::memory_order_relaxed); }

        bool isAwake() const
        {
                return m_awake;
        }
 
        inline bool isEnabled() const
        {
                return m_enabledModel.value();
        }
 
        inline f_cnt_t timeout() const
        {
                const float samples = Engine::audioEngine()->outputSampleRate() * m_autoQuitModel.value() / 1000.0f;
                return 1 + ( static_cast<int>( samples ) / Engine::audioEngine()->framesPerPeriod() );
        }
 
        inline float wetLevel() const
        {
                return m_wetDryModel.value();
        }
 
        inline float dryLevel() const
        {
                return 1.0f - m_wetDryModel.value();
        }
 
        inline bool dontRun() const
        {
                return m_noRun;
        }
 
        inline void setDontRun( bool _state )
        {
                m_noRun = _state;
        }
 
        bool isProcessingAudio() const
        {
                return isEnabled() && isAwake() && isOkay() && !dontRun();
        }
 
        inline TempoSyncKnobModel* autoQuitModel()
        {
                return &m_autoQuitModel;
        }
 
        bool autoQuitEnabled() const
        {
                return m_autoQuitEnabled;
        }
 
        EffectChain * effectChain() const
        {
                return m_parent;
        }
 
        virtual EffectControls * controls() = 0;
 
        static Effect * instantiate( const QString & _plugin_name,
                                Model * _parent,
                                Descriptor::SubPluginFeatures::Key * _key );
 
 
protected:
        enum class ProcessStatus
        {
                Continue,

                ContinueIfNotQuiet,

                Sleep
        };

        virtual ProcessStatus processImpl(SampleFrame* buf, const f_cnt_t frames) = 0;

        virtual void processBypassedImpl() {}
 
 
        gui::PluginView* instantiateView( QWidget * ) override;
 
        void goToSleep()
        {
                m_quietBufferCount = 0;
                m_awake = false;
        }
 
        void wakeUp()
        {
                m_quietBufferCount = 0;
                m_awake = true;
        }
 
        virtual void onEnabledChanged() {}
 
private:
        void handleAutoQuit(bool silentOutput);
 
 
        EffectChain * m_parent;
 
        bool m_okay;
        bool m_noRun;
        bool m_awake;
        std::atomic<bool> m_corrupted = false;

        f_cnt_t m_quietBufferCount = 0;
 
        BoolModel m_enabledModel;
        FloatModel m_wetDryModel;
        TempoSyncKnobModel m_autoQuitModel;
 
        bool m_autoQuitEnabled = false;
 
        friend class gui::EffectView;
        friend class EffectChain;
 
} ;
 
using EffectKey = Effect::Descriptor::SubPluginFeatures::Key;
using EffectKeyList = Effect::Descriptor::SubPluginFeatures::KeyList;
 
} // namespace lmms
 
#endif // LMMS_EFFECT_H