minierosion/Erosion.cpp at master · Davit-G/minierosion · GitHub

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#include "Erosion.h"

#include <JuceHeader.h>

void Erosion::processBlock(dsp::AudioBlock<float>& block, double sampleRate)
{

    auto leftBlock = block.getSingleChannelBlock(0);
    auto rightBlock = block.getSingleChannelBlock(1);

    for (int i = 0; i < block.getNumSamples(); i++) {
        delayLine.pushSample(0, leftBlock.getSample(0, i));
        delayLine.pushSample(1, rightBlock.getSample(0, i));
    }

    // get the current value of the saturation knob to figure out how much to multiply a random value by
    float saturationAmount = erosionAmount->get() * 0.1f;

    // create buffer to store the random values
    randomBuffer.clear();
    for (int i = 0; i < block.getNumSamples(); i++) {
        // store the filtered random value in the buffer

        float randomValue = random.nextFloat() * 2.0f - 1.0f;
        randomBuffer.setSample(0, i, randomValue);

        randomValue = random.nextFloat() * 2.0f - 1.0f;
        randomBuffer.setSample(1, i, randomValue);
    }

    *iirFilter.state = *dsp::IIR::Coefficients<float>::makeBandPass(sampleRate, erosionFrequency->get(), erosionQ->get());

    // now, filter the random values
    iirFilter.process(dsp::ProcessContextReplacing<float>(randomBlock));

    // now with the filtered values, multiply them by the saturation amount

    for (int i = 0; i < block.getNumSamples(); i++) {
        float leftEroded = delayLine.popSample(0, 5.f + (randomBuffer.getSample(0, i)) * (saturationAmount));
        float rightEroded = delayLine.popSample(1, 5.f + (randomBuffer.getSample(1, i)) * (saturationAmount));

        block.setSample(0, i, leftEroded);
        block.setSample(1, i, rightEroded);
    }
}

void Erosion::processSidechainedBlock(dsp::AudioBlock<float>& block, dsp::AudioBlock<float>& sidechain, double sampleRate) {
    auto leftBlock = block.getSingleChannelBlock(0);
    auto rightBlock = block.getSingleChannelBlock(1);

    for (int i = 0; i < block.getNumSamples(); i++) {
        delayLine.pushSample(0, leftBlock.getSample(0, i));
        delayLine.pushSample(1, rightBlock.getSample(0, i));
    }

    // get the current value of the saturation knob to figure out how much to multiply our sidechain value by
    float saturationAmount = erosionAmount->get() * 0.5f;

    *iirFilter.state = *dsp::IIR::Coefficients<float>::makeBandPass(sampleRate, erosionFrequency->get(), erosionQ->get());

    // create buffer to store the random values
    // randomBuffer.clear();
    // for (int i = 0; i < block.getNumSamples(); i++) {
    //     // store the filtered random value in the buffer

    //     float randomValue = sidechain.getSample(0, i) * 2.0f - 1.0f;
    //     randomBuffer.setSample(0, i, randomValue);

    //     randomValue = sidechain.getSample(1, i) * 2.0f - 1.0f;
    //     randomBuffer.setSample(1, i, randomValue);
    // }

    // now, filter the random values
    // iirFilter.process(dsp::ProcessContextReplacing<float>(randomBlock));

    // now with the filtered values, multiply them by the saturation amount

    for (int i = 0; i < block.getNumSamples(); i++) {
        float leftEroded = delayLine.popSample(0, (sidechain.getSample(0, i) + 1.f) * saturationAmount);
        float rightEroded = delayLine.popSample(1, (sidechain.getSample(1, i) + 1.f) * saturationAmount);

        block.setSample(0, i, leftEroded);
        block.setSample(1, i, rightEroded);
    }
}

void Erosion::prepareToPlay(double sampleRate, int samplesPerBlock)
{
    // init delay

    dsp::ProcessSpec spec;
    spec.sampleRate = sampleRate;
    spec.maximumBlockSize = samplesPerBlock;
    spec.numChannels = 2;

    delayLine.prepare(spec);

    delayLine.setMaximumDelayInSamples(0.1 * sampleRate);

    // init iir filter
    *iirFilter.state = dsp::IIR::ArrayCoefficients<float>::makeBandPass(sampleRate, 880.0, 3.0);

    iirFilter.prepare(spec);

    // init random
    random.setSeedRandomly();

    // init random buffer
    randomBuffer.setSize(2, samplesPerBlock);
    randomBuffer.clear();

    randomBlock = dsp::AudioBlock<float>(randomBuffer);

    oldSampleRate = sampleRate;
    oldSamplesPerBlock = samplesPerBlock;
}