simpledelay.h

class SimpleDelay
{
public:
    SimpleDelay(int maxchans, int maxdelaytimesamples)
    {
        maxchans = juce::jlimit(1, 2, maxchans);
        mDelayBuffer.setSize(maxchans, maxdelaytimesamples);
        mDelayBuffer.clear();
    }
    float processSample(int chan, float input)
    {
        auto ptrs = mDelayBuffer.getArrayOfWritePointers();
        int& writepos = mWritePos[chan];
        ptrs[chan][writepos] = input + mFeedBackSignals[chan] * mFeedBackAmount;
        ++writepos;
        if (writepos == mDelayBuffer.getNumSamples())
            writepos = 0;
        int& readpos = mReadPos[chan];
        float outsample = ptrs[chan][readpos];
        ++readpos;
        if (readpos == mDelayBuffer.getNumSamples())
            readpos = 0;
        mFeedBackSignals[chan] = outsample;
        return outsample * mWetDryMix + input * (1.0f - mWetDryMix);
    }
    void processBlock(juce::AudioBuffer<float>& buffer)
    {
        auto ptrs = buffer.getArrayOfWritePointers();
        for (int i = 0; i < buffer.getNumChannels(); ++i)
        {
            for (int j = 0; j < buffer.getNumSamples(); ++j)
            {
                ptrs[i][j] = processSample(i, ptrs[i][j]);
            }
        }
    }
    void setFeedbackGain(float g)
    {
        mFeedBackAmount = g;
    }
    void setWetDryMix(float m)
    {
        mWetDryMix = m;
    }
    void setDelayTimeSamples(int dtime)
    {
        if (mDelayTimes[0] == dtime)
            return;
        // super ugly sounding way to do this...can obviously be improved, but left as an exercise for the reader
        // could really just use the Juce dsp::DelayLine anyway...
        dtime = juce::jlimit(2, mDelayBuffer.getNumSamples() - 1, dtime);
        mDelayTimes[0] = dtime;
        mWritePos[0] = dtime;
        mWritePos[1] = dtime;
        mReadPos[0] = 0;
        mReadPos[1] = 0;
    }
private:
    juce::AudioBuffer<float> mDelayBuffer;
    int mWritePos[2] = { 22050,22050 };
    int mReadPos[2] = { 0,0 };
    float mFeedBackSignals[2] = { 0.0f,0.0f };
    float mFeedBackAmount = 0.0f;
    float mWetDryMix = 0.5f;
    int mDelayTimes[2] = { 22050,22050 };
};