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_Phaser.h

@@ -0,0 +1,206 @@
+/*
+  ==============================================================================
+
+   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 6 stage phaser that modulates first order all-pass filters to create sweeping
+    notches in the magnitude frequency response.
+
+    This audio effect can be controlled with standard phaser parameters: the speed
+    and depth of the LFO controlling the frequency response, a mix control, a
+    feedback control, and the centre frequency of the modulation.
+
+    @tags{DSP}
+*/
+template <typename SampleType>
+class Phaser
+{
+public:
+    //==============================================================================
+    /** Constructor. */
+    Phaser();
+
+    //==============================================================================
+    /** Sets the rate (in Hz) of the LFO modulating the phaser all-pass filters. This
+        rate must be lower than 100 Hz.
+    */
+    void setRate (SampleType newRateHz);
+
+    /** Sets the volume (between 0 and 1) of the LFO modulating the phaser all-pass
+        filters.
+    */
+    void setDepth (SampleType newDepth);
+
+    /** Sets the centre frequency (in Hz) of the phaser all-pass filters modulation.
+    */
+    void setCentreFrequency (SampleType newCentreHz);
+
+    /** Sets the feedback volume (between -1 and 1) of the phaser. Negative can be
+        used to get specific phaser sounds.
+    */
+    void setFeedback (SampleType newFeedback);
+
+    /** Sets the amount of dry and wet signal in the output of the phaser (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;
+        }
+
+        int numSamplesDown = 0;
+        auto counter = updateCounter;
+
+        for (size_t i = 0; i < numSamples; ++i)
+        {
+            if (counter == 0)
+                numSamplesDown++;
+
+            counter++;
+
+            if (counter == maxUpdateCounter)
+                counter = 0;
+        }
+
+        if (numSamplesDown > 0)
+        {
+            auto freqBlock = AudioBlock<SampleType>(bufferFrequency).getSubBlock (0, (size_t) numSamplesDown);
+            auto contextFreq = ProcessContextReplacing<SampleType> (freqBlock);
+            freqBlock.clear();
+
+            osc.process (contextFreq);
+            freqBlock.multiplyBy (oscVolume);
+        }
+
+        auto* freqSamples = bufferFrequency.getWritePointer (0);
+
+        for (int i = 0; i < numSamplesDown; ++i)
+        {
+            auto lfo = jlimit (static_cast<SampleType> (0.0),
+                               static_cast<SampleType> (1.0),
+                               freqSamples[i] + normCentreFrequency);
+
+            freqSamples[i] = mapToLog10 (lfo, static_cast<SampleType> (20.0),
+                                         static_cast<SampleType> (jmin (20000.0, 0.49 * sampleRate)));
+        }
+
+        auto currentFrequency = filters[0]->getCutoffFrequency();
+        dryWet.pushDrySamples (inputBlock);
+
+        for (size_t channel = 0; channel < numChannels; ++channel)
+        {
+            counter = updateCounter;
+            int k = 0;
+
+            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];
+
+                if (i == 0 && counter != 0)
+                    for (int n = 0; n < numStages; ++n)
+                        filters[n]->setCutoffFrequency (currentFrequency);
+
+                if (counter == 0)
+                {
+                    for (int n = 0; n < numStages; ++n)
+                        filters[n]->setCutoffFrequency (freqSamples[k]);
+
+                    k++;
+                }
+
+                for (int n = 0; n < numStages; ++n)
+                    output = filters[n]->processSample ((int) channel, output);
+
+                outputSamples[i] = output;
+                lastOutput[channel] = output * feedbackVolume[channel].getNextValue();
+
+                counter++;
+
+                if (counter == maxUpdateCounter)
+                    counter = 0;
+            }
+        }
+
+        dryWet.mixWetSamples (outputBlock);
+        updateCounter = (updateCounter + (int) numSamples) % maxUpdateCounter;
+    }
+
+private:
+    //==============================================================================
+    void update();
+
+    //==============================================================================
+    Oscillator<SampleType> osc;
+    OwnedArray<FirstOrderTPTFilter<SampleType>> filters;
+    SmoothedValue<SampleType, ValueSmoothingTypes::Linear> oscVolume;
+    std::vector<SmoothedValue<SampleType, ValueSmoothingTypes::Linear>> feedbackVolume { 2 };
+    DryWetMixer<SampleType> dryWet;
+    std::vector<SampleType> lastOutput { 2 };
+    AudioBuffer<SampleType> bufferFrequency;
+    SampleType normCentreFrequency = 0.5;
+    double sampleRate = 44100.0;
+
+    int updateCounter = 0;
+    static constexpr int maxUpdateCounter = 4;
+
+    SampleType rate = 1.0, depth = 0.5, feedback = 0.0, mix = 0.5;
+    SampleType centreFrequency = 1300.0;
+    static constexpr int numStages = 6;
+};
+
+} // namespace dsp
+} // namespace juce