Multiband_Compressor.java

#include <JuceHeader.h>

class MultibandCompressorProcessor
{
public:
    MultibandCompressorProcessor() {}

    void prepareToPlay(double sampleRate, int samplesPerBlock)
    {
        dsp::ProcessSpec spec;
        spec.sampleRate = sampleRate;
        spec.maximumBlockSize = samplesPerBlock;
        spec.numChannels = 2;

        for (auto& compressor : compressors)
        {
            compressor.prepare(spec);
            compressor.setAttackTime(20.0f);
            compressor.setReleaseTime(50.0f);
            compressor.setRatio(2.5f);
            compressor.setThreshold(-12.0f);
        }

        // Set specific parameters for each band
        compressors[0].setRatio(4.0f);  // Low Band
        compressors[1].setThreshold(-10.0f);  // Low-Mid Band
        compressors[2].setAttackTime(10.0f);  // High-Mid Band
        compressors[3].setReleaseTime(30.0f);  // High Band
    }

    void setAttack(float value) { for (auto& c : compressors) c.setAttackTime(value); }
    void setRelease(float value) { for (auto& c : compressors) c.setReleaseTime(value); }
    void setThreshold(float value) { for (auto& c : compressors) c.setThreshold(value); }
    void setRatio(float value) { for (auto& c : compressors) c.setRatio(value); }

    void processBlock(AudioBuffer<float>& buffer)
    {
        dsp::AudioBlock<float> audioBlock(buffer);
        dsp::ProcessContextReplacing<float> context(audioBlock);

        // Split into frequency bands and apply compression
        splitBands(buffer);
        for (size_t i = 0; i < compressors.size(); ++i)
        {
            compressors[i].process(context);
        }
    }

private:
    std::array<dsp::Compressor<float>, 4> compressors; // 4-band compressor

    void splitBands(AudioBuffer<float>& buffer)
    {
        // Example band splitting logic using crossover filters
        // This would split the audio into four frequency bands
    }
};

class MultibandCompressorEditor : public juce::AudioProcessorEditor
{
public:
    MultibandCompressorEditor(MultibandCompressorProcessor& p) : processor(p)
    {
        setSize(400, 300);
        addAndMakeVisible(attackSlider);
        addAndMakeVisible(releaseSlider);
        addAndMakeVisible(thresholdSlider);
        addAndMakeVisible(ratioSlider);

        configureSlider(attackSlider, "Attack", juce::Colours::red, 1.0, 100.0, 20.0);
        configureSlider(releaseSlider, "Release", juce::Colours::blue, 10.0, 200.0, 50.0);
        configureSlider(thresholdSlider, "Threshold", juce::Colours::yellow, -60.0, 0.0, -12.0);
        configureSlider(ratioSlider, "Ratio", juce::Colours::green, 1.0, 10.0, 2.5);
    }

    void paint(juce::Graphics& g) override
    {
        g.fillAll(juce::Colours::black);
        g.setColour(juce::Colours::white);
        g.setFont(15.0f);
        g.drawFittedText("Multiband Compressor", getLocalBounds(), juce::Justification::centred, 1);
    }

    void resized() override
    {
        auto area = getLocalBounds();
        auto sliderArea = area.removeFromTop(200).reduced(10);
        attackSlider.setBounds(sliderArea.removeFromLeft(90));
        releaseSlider.setBounds(sliderArea.removeFromLeft(90));
        thresholdSlider.setBounds(sliderArea.removeFromLeft(90));
        ratioSlider.setBounds(sliderArea.removeFromLeft(90));
    }

private:
    MultibandCompressorProcessor& processor;
    juce::Slider attackSlider, releaseSlider, thresholdSlider, ratioSlider;

    void configureSlider(juce::Slider& slider, const juce::String& name, juce::Colour colour, double min, double max, double value)
    {
        slider.setSliderStyle(juce::Slider::Rotary);
        slider.setTextBoxStyle(juce::Slider::TextBoxBelow, false, 50, 20);
        slider.setRange(min, max, 0.1);
        slider.setValue(value);
        slider.setName(name);
        slider.setColour(juce::Slider::rotarySliderFillColourId, colour);
        slider.onValueChange = [this, &slider, name]()
        {
            if (name == "Attack") processor.setAttack(slider.getValue());
            else if (name == "Release") processor.setRelease(slider.getValue());
            else if (name == "Threshold") processor.setThreshold(slider.getValue());
            else if (name == "Ratio") processor.setRatio(slider.getValue());
        };
    }
};