git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce

subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"

deps/juce/modules/juce_dsp/widgets/juce_Chorus.h

@@ -0,0 +1,169 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2020 - Raw Material Software Limited
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   By using JUCE, you agree to the terms of both the JUCE 6 End-User License
+   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
+
+   End User License Agreement: www.juce.com/juce-6-licence
+   Privacy Policy: www.juce.com/juce-privacy-policy
+
+   Or: You may also use this code under the terms of the GPL v3 (see
+   www.gnu.org/licenses).
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+namespace dsp
+{
+
+/**
+    A simple chorus DSP widget that modulates the delay of a delay line in order to
+    create sweeping notches in the magnitude frequency response.
+
+    This audio effect can be controlled via the speed and depth of the LFO controlling
+    the frequency response, a mix control, a feedback control, and the centre delay
+    of the modulation.
+
+    Note: To get classic chorus sounds try to use a centre delay time around 7-8 ms
+    with a low feeback volume and a low depth. This effect can also be used as a
+    flanger with a lower centre delay time and a lot of feedback, and as a vibrato
+    effect if the mix value is 1.
+
+    @tags{DSP}
+*/
+template <typename SampleType>
+class Chorus
+{
+public:
+    //==============================================================================
+    /** Constructor. */
+    Chorus();
+
+    //==============================================================================
+    /** Sets the rate (in Hz) of the LFO modulating the chorus delay line. This rate
+        must be lower than 100 Hz.
+    */
+    void setRate (SampleType newRateHz);
+
+    /** Sets the volume of the LFO modulating the chorus delay line (between 0 and 1).
+    */
+    void setDepth (SampleType newDepth);
+
+    /** Sets the centre delay in milliseconds of the chorus delay line modulation.
+        This delay must be between 1 and 100 ms.
+    */
+    void setCentreDelay (SampleType newDelayMs);
+
+    /** Sets the feedback volume (between -1 and 1) of the chorus delay line.
+        Negative values can be used to get specific chorus sounds.
+    */
+    void setFeedback (SampleType newFeedback);
+
+    /** Sets the amount of dry and wet signal in the output of the chorus (between 0
+        for full dry and 1 for full wet).
+    */
+    void setMix (SampleType newMix);
+
+    //==============================================================================
+    /** Initialises the processor. */
+    void prepare (const ProcessSpec& spec);
+
+    /** Resets the internal state variables of the processor. */
+    void reset();
+
+    //==============================================================================
+    /** Processes the input and output samples supplied in the processing context. */
+    template <typename ProcessContext>
+    void process (const ProcessContext& context) noexcept
+    {
+        const auto& inputBlock = context.getInputBlock();
+        auto& outputBlock      = context.getOutputBlock();
+        const auto numChannels = outputBlock.getNumChannels();
+        const auto numSamples  = outputBlock.getNumSamples();
+
+        jassert (inputBlock.getNumChannels() == numChannels);
+        jassert (inputBlock.getNumChannels() == lastOutput.size());
+        jassert (inputBlock.getNumSamples()  == numSamples);
+
+        if (context.isBypassed)
+        {
+            outputBlock.copyFrom (inputBlock);
+            return;
+        }
+
+        auto delayValuesBlock = AudioBlock<SampleType>(bufferDelayTimes).getSubBlock (0, numSamples);
+        auto contextDelay = ProcessContextReplacing<SampleType> (delayValuesBlock);
+        delayValuesBlock.clear();
+
+        osc.process (contextDelay);
+        delayValuesBlock.multiplyBy (oscVolume);
+
+        auto* delaySamples = bufferDelayTimes.getWritePointer (0);
+
+        for (size_t i = 0; i < numSamples; ++i)
+        {
+            auto lfo = jmax (static_cast<SampleType> (1.0), maximumDelayModulation * delaySamples[i] + centreDelay);
+            delaySamples[i] = static_cast<SampleType> (lfo * sampleRate / 1000.0);
+        }
+
+        dryWet.pushDrySamples (inputBlock);
+
+        for (size_t channel = 0; channel < numChannels; ++channel)
+        {
+            auto* inputSamples  = inputBlock .getChannelPointer (channel);
+            auto* outputSamples = outputBlock.getChannelPointer (channel);
+
+            for (size_t i = 0; i < numSamples; ++i)
+            {
+                auto input = inputSamples[i];
+                auto output = input - lastOutput[channel];
+
+                delay.pushSample ((int) channel, output);
+                delay.setDelay (delaySamples[i]);
+                output = delay.popSample ((int) channel);
+
+                outputSamples[i] = output;
+                lastOutput[channel] = output * feedbackVolume[channel].getNextValue();
+            }
+        }
+
+        dryWet.mixWetSamples (outputBlock);
+    }
+
+private:
+    //==============================================================================
+    void update();
+
+    //==============================================================================
+    Oscillator<SampleType> osc;
+    DelayLine<SampleType, DelayLineInterpolationTypes::Linear> delay;
+    SmoothedValue<SampleType, ValueSmoothingTypes::Linear> oscVolume;
+    std::vector<SmoothedValue<SampleType, ValueSmoothingTypes::Linear>> feedbackVolume { 2 };
+    DryWetMixer<SampleType> dryWet;
+    std::vector<SampleType> lastOutput { 2 };
+    AudioBuffer<SampleType> bufferDelayTimes;
+
+    double sampleRate = 44100.0;
+    SampleType rate = 1.0, depth = 0.25, feedback = 0.0, mix = 0.5,
+               centreDelay = 7.0;
+
+    static constexpr SampleType maxDepth               = 1.0,
+                                maxCentreDelayMs       = 100.0,
+                                oscVolumeMultiplier    = 0.5,
+                                maximumDelayModulation = 20.0;
+};
+
+} // namespace dsp
+} // namespace juce