Table of contents

• General info
• Data structure
• Built With
• Save parameters
• Prepare to play
• License

About The Project

General info

This project is a simple VST3 delay effect that works separately on the left and right channel. You can use different delay time on left and right channel, which can be also synchronized to tempo of the song by setting rhythmic division. There is also a bunch of additional effect like tap echo or flanger.

Data structure

To achieve a delayed effect I used the circular buffer structure which size depends on from the parameters set by the user.

Built With

• C++
• Juce

Save parameters

void DelayAudioProcessor::getStateInformation (juce::MemoryBlock& destData)
{
    auto state = treeState.copyState();
    std::unique_ptr<juce::XmlElement> xml(state.createXml());
    copyXmlToBinary(*xml, destData);
}

void DelayAudioProcessor::setStateInformation (const void* data, int sizeInBytes)
{
    std::unique_ptr<juce::XmlElement> xmlState(getXmlFromBinary(data, sizeInBytes));

    if (xmlState.get() != nullptr)
        if (xmlState->hasTagName(treeState.state.getType()))
            treeState.replaceState(juce::ValueTree::fromXml(*xmlState));
}

Prepare to play

void DelayAudioProcessor::prepareToPlay (double sampleRate, int samplesPerBlock)
{
    lastSampleRate = sampleRate;

    mCirclarBufferLenght = MAX_DELAY_TIME * sampleRate;

    if (mCircularBufferLeft == nullptr)
    {
        mCircularBufferLeft = new float[mCirclarBufferLenght];
    }

    juce::zeromem(mCircularBufferLeft, mCirclarBufferLenght * sizeof(float));

    if (mCircularBufferRight == nullptr)
    {
        mCircularBufferRight = new float[mCirclarBufferLenght];
    }

    juce::zeromem(mCircularBufferRight, mCirclarBufferLenght * sizeof(float));

    mCircularBufferWriterHead = 0;
    mCircularBufferWriterHeadLeft = 0;

    mDelaySmoothed = *treeState.getRawParameterValue(TIME_R_ID);
    mDelaySmoothedLeft = *treeState.getRawParameterValue(TIME_L_ID);
}

License

Distributed under the MIT License.

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