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135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce::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 juce::dsp
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