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_NoiseGate.cpp

@@ -0,0 +1,129 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+//==============================================================================
+template <typename SampleType>
+NoiseGate<SampleType>::NoiseGate()
+{
+    update();
+
+    RMSFilter.setLevelCalculationType (BallisticsFilterLevelCalculationType::RMS);
+    RMSFilter.setAttackTime  (static_cast<SampleType> (0.0));
+    RMSFilter.setReleaseTime (static_cast<SampleType> (50.0));
+}
+
+template <typename SampleType>
+void NoiseGate<SampleType>::setThreshold (SampleType newValue)
+{
+    thresholddB = newValue;
+    update();
+}
+
+template <typename SampleType>
+void NoiseGate<SampleType>::setRatio (SampleType newRatio)
+{
+    jassert (newRatio >= static_cast<SampleType> (1.0));
+
+    ratio = newRatio;
+    update();
+}
+
+template <typename SampleType>
+void NoiseGate<SampleType>::setAttack (SampleType newAttack)
+{
+    attackTime = newAttack;
+    update();
+}
+
+template <typename SampleType>
+void NoiseGate<SampleType>::setRelease (SampleType newRelease)
+{
+    releaseTime = newRelease;
+    update();
+}
+
+//==============================================================================
+template <typename SampleType>
+void NoiseGate<SampleType>::prepare (const ProcessSpec& spec)
+{
+    jassert (spec.sampleRate > 0);
+    jassert (spec.numChannels > 0);
+
+    sampleRate = spec.sampleRate;
+
+    RMSFilter.prepare (spec);
+    envelopeFilter.prepare (spec);
+
+    update();
+    reset();
+}
+
+template <typename SampleType>
+void NoiseGate<SampleType>::reset()
+{
+    RMSFilter.reset();
+    envelopeFilter.reset();
+}
+
+//==============================================================================
+template <typename SampleType>
+SampleType NoiseGate<SampleType>::processSample (int channel, SampleType sample)
+{
+    // RMS ballistics filter
+    auto env = RMSFilter.processSample (channel, sample);
+
+    // Ballistics filter
+    env = envelopeFilter.processSample (channel, env);
+
+    // VCA
+    auto gain = (env > threshold) ? static_cast<SampleType> (1.0)
+                                  : std::pow (env * thresholdInverse, currentRatio - static_cast<SampleType> (1.0));
+
+    // Output
+    return gain * sample;
+}
+
+template <typename SampleType>
+void NoiseGate<SampleType>::update()
+{
+    threshold = Decibels::decibelsToGain (thresholddB, static_cast<SampleType> (-200.0));
+    thresholdInverse = static_cast<SampleType> (1.0) / threshold;
+    currentRatio = ratio;
+
+    envelopeFilter.setAttackTime  (attackTime);
+    envelopeFilter.setReleaseTime (releaseTime);
+}
+
+//==============================================================================
+template class NoiseGate<float>;
+template class NoiseGate<double>;
+
+} // namespace dsp
+} // namespace juce