ParametricEQ.h

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#ifndef OPENSHOT_PARAMETRIC_EQ_AUDIO_EFFECT_H
#define OPENSHOT_PARAMETRIC_EQ_AUDIO_EFFECT_H
#define _USE_MATH_DEFINES
 
#include "EffectBase.h"
 
#include "Json.h"
#include "KeyFrame.h"
#include "Enums.h"
 
#include <memory>
#include <string>
 
#include <AppConfig.h>
#include <juce_audio_basics/juce_audio_basics.h>
 
namespace openshot
{
    class Frame;
 
    class ParametricEQ : public EffectBase
    {
    private:
        void init_effect_details();
 
    public:
        openshot::FilterType filter_type;
        Keyframe frequency;
        Keyframe q_factor;
        Keyframe gain;
        bool initialized;
 
        ParametricEQ();
 
        ParametricEQ(openshot::FilterType filter_type, Keyframe frequency,
                     Keyframe gain, Keyframe q_factor);
 
        std::shared_ptr<openshot::Frame> GetFrame(int64_t frame_number) override {
            return GetFrame(std::make_shared<openshot::Frame>(), frame_number);
        }
 
        std::shared_ptr<openshot::Frame>
        GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number) override;
 
        // Get and Set JSON methods
        std::string Json() const override; 
        void SetJson(const std::string value) override; 
        Json::Value JsonValue() const override; 
        void SetJsonValue(const Json::Value root) override; 
 
        std::string PropertiesJSON(int64_t requested_frame) const override;
 
        class Filter : public juce::IIRFilter
        {
        public:
            void updateCoefficients (const double discrete_frequency,
                                     const double q_factor,
                                     const double gain,
                                     const int filter_type);
        };
 
        juce::OwnedArray<Filter> filters;
 
        void updateFilters(int64_t frame_number, double sample_rate);
    };
 
}
 
#endif