mirror of
https://github.com/juce-framework/JUCE.git
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114 lines
3.1 KiB
C++
114 lines
3.1 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE 7 technical preview.
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Copyright (c) 2022 - 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 the technical preview this file cannot be licensed commercially.
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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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Compressor<SampleType>::Compressor()
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{
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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 Compressor<SampleType>::setThreshold (SampleType newThreshold)
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{
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thresholddB = newThreshold;
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update();
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}
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template <typename SampleType>
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void Compressor<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 Compressor<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 Compressor<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 Compressor<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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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 Compressor<SampleType>::reset()
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{
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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 Compressor<SampleType>::processSample (int channel, SampleType inputValue)
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{
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// Ballistics filter with peak rectifier
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auto env = envelopeFilter.processSample (channel, inputValue);
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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, ratioInverse - static_cast<SampleType> (1.0));
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// Output
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return gain * inputValue;
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}
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template <typename SampleType>
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void Compressor<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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ratioInverse = static_cast<SampleType> (1.0) / 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 Compressor<float>;
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template class Compressor<double>;
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} // namespace dsp
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} // namespace juce
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