99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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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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void Limiter<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 Limiter<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 Limiter<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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firstStageCompressor.prepare (spec);
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secondStageCompressor.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 Limiter<SampleType>::reset()
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{
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firstStageCompressor.reset();
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secondStageCompressor.reset();
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outputVolume.reset (sampleRate, 0.001);
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}
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//==============================================================================
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template <typename SampleType>
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void Limiter<SampleType>::update()
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{
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firstStageCompressor.setThreshold ((SampleType) -10.0);
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firstStageCompressor.setRatio ((SampleType) 4.0);
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firstStageCompressor.setAttack ((SampleType) 2.0);
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firstStageCompressor.setRelease ((SampleType) 200.0);
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secondStageCompressor.setThreshold (thresholddB);
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secondStageCompressor.setRatio ((SampleType) 1000.0);
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secondStageCompressor.setAttack ((SampleType) 0.001);
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secondStageCompressor.setRelease (releaseTime);
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auto ratioInverse = (SampleType) (1.0 / 4.0);
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auto gain = (SampleType) std::pow (10.0, 10.0 * (1.0 - ratioInverse) / 40.0);
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gain *= Decibels::decibelsToGain (-thresholddB, (SampleType) -100.0);
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outputVolume.setTargetValue (gain);
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}
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//==============================================================================
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template class Limiter<float>;
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template class Limiter<double>;
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} // namespace dsp
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} // namespace juce
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