mirror of
https://github.com/juce-framework/JUCE.git
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122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE 6 technical preview.
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Copyright (c) 2020 - Raw Material Software Limited
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You may use this code under the terms of the GPL v3
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(see www.gnu.org/licenses).
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For this technical preview, this file is not subject to commercial licensing.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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namespace dsp
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{
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//==============================================================================
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template <typename SampleType>
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NoiseGate<SampleType>::NoiseGate()
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{
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update();
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RMSFilter.setLevelCalculationType (BallisticsFilterLevelCalculationType::RMS);
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RMSFilter.setAttackTime (static_cast<SampleType> (0.0));
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RMSFilter.setReleaseTime (static_cast<SampleType> (50.0));
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}
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template <typename SampleType>
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void NoiseGate<SampleType>::setThreshold (SampleType newValue)
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{
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thresholddB = newValue;
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update();
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}
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template <typename SampleType>
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void NoiseGate<SampleType>::setRatio (SampleType newRatio)
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{
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jassert (newRatio >= static_cast<SampleType> (1.0));
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ratio = newRatio;
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update();
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}
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template <typename SampleType>
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void NoiseGate<SampleType>::setAttack (SampleType newAttack)
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{
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attackTime = newAttack;
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update();
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}
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template <typename SampleType>
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void NoiseGate<SampleType>::setRelease (SampleType newRelease)
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{
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releaseTime = newRelease;
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update();
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}
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//==============================================================================
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template <typename SampleType>
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void NoiseGate<SampleType>::prepare (const ProcessSpec& spec)
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{
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jassert (spec.sampleRate > 0);
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jassert (spec.numChannels > 0);
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sampleRate = spec.sampleRate;
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RMSFilter.prepare (spec);
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envelopeFilter.prepare (spec);
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update();
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reset();
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}
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template <typename SampleType>
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void NoiseGate<SampleType>::reset()
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{
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RMSFilter.reset();
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envelopeFilter.reset();
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}
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//==============================================================================
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template <typename SampleType>
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SampleType NoiseGate<SampleType>::processSample (int channel, SampleType sample)
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{
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// RMS ballistics filter
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auto env = RMSFilter.processSample (channel, sample);
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// Ballistics filter
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env = envelopeFilter.processSample (channel, env);
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// VCA
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auto gain = (env > threshold) ? static_cast<SampleType> (1.0)
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: std::pow (env * thresholdInverse, currentRatio - static_cast<SampleType> (1.0));
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// Output
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return gain * sample;
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}
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template <typename SampleType>
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void NoiseGate<SampleType>::update()
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{
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threshold = Decibels::decibelsToGain (thresholddB, static_cast<SampleType> (-200.0));
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thresholdInverse = static_cast<SampleType> (1.0) / threshold;
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currentRatio = ratio;
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envelopeFilter.setAttackTime (attackTime);
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envelopeFilter.setReleaseTime (releaseTime);
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}
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//==============================================================================
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template class NoiseGate<float>;
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template class NoiseGate<double>;
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} // namespace dsp
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} // namespace juce
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