DPF/examples/ImGuiSimpleGain/PluginSimpleGain.hpp

/*
 * Simple Gain audio effect based on DISTRHO Plugin Framework (DPF)
 *
 * SPDX-License-Identifier: MIT
 *
 * Copyright (C) 2021 Jean Pierre Cimalando <jp-dev@inbox.ru>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef PLUGIN_SIMPLEGAIN_H
#define PLUGIN_SIMPLEGAIN_H

#include "DistrhoPlugin.hpp"
#include "CParamSmooth.hpp"
#include "extra/ScopedPointer.hpp"

START_NAMESPACE_DISTRHO

#ifndef MIN
#define MIN(a,b) ( (a) < (b) ? (a) : (b) )
#endif

#ifndef MAX
#define MAX(a,b) ( (a) > (b) ? (a) : (b) )
#endif

#ifndef CLAMP
#define CLAMP(v, min, max) (MIN((max), MAX((min), (v))))
#endif

#ifndef DB_CO
#define DB_CO(g) ((g) > -90.0f ? powf(10.0f, (g) * 0.05f) : 0.0f)
#endif

// -----------------------------------------------------------------------

class PluginSimpleGain : public Plugin {
public:
    enum Parameters {
        paramGain = 0,
        paramCount
    };

    PluginSimpleGain();

protected:
    // -------------------------------------------------------------------
    // Information

    const char* getLabel() const noexcept override
    {
        return "SimpleGain";
    }

    const char* getDescription() const override
    {
        return "A simple audio volume gain plugin with ImGui for its GUI";
    }

    const char* getMaker() const noexcept override
    {
        return "Jean Pierre Cimalando, falkTX";
    }

    const char* getLicense() const noexcept override
    {
        return "MIT";
    }

    uint32_t getVersion() const noexcept override
    {
        return d_version(1, 0, 0);
    }

    int64_t getUniqueId() const noexcept override
    {
        return d_cconst('d', 'I', 'm', 'G');
    }

    // -------------------------------------------------------------------
    // Init

    void initParameter(uint32_t index, Parameter& parameter) override;

    // -------------------------------------------------------------------
    // Internal data

    float getParameterValue(uint32_t index) const override;
    void setParameterValue(uint32_t index, float value) override;

    // -------------------------------------------------------------------
    // Optional

    // Optional callback to inform the plugin about a sample rate change.
    void sampleRateChanged(double newSampleRate) override;

    // -------------------------------------------------------------------
    // Process

    void activate() override;
    void run(const float**, float** outputs, uint32_t frames) override;

    // -------------------------------------------------------------------

private:
    double fSampleRate;
    float  fGainDB;
    float  fGainLinear;
    ScopedPointer<CParamSmooth> fSmoothGain;

    DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(PluginSimpleGain)
};

// -----------------------------------------------------------------------

END_NAMESPACE_DISTRHO

#endif  // #ifndef PLUGIN_SIMPLEGAIN_H