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juce_Limiter.cpp
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2022 - 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 7 End-User License
Agreement and JUCE Privacy Policy.
End User License Agreement: www.juce.com/juce-7-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::dsp
{
//==============================================================================
template <typename SampleType>
void Limiter<SampleType>::setThreshold (SampleType newThreshold)
{
thresholddB = newThreshold;
update();
}
template <typename SampleType>
void Limiter<SampleType>::setRelease (SampleType newRelease)
{
releaseTime = newRelease;
update();
}
//==============================================================================
template <typename SampleType>
void Limiter<SampleType>::prepare (const ProcessSpec& spec)
{
jassert (spec.sampleRate > 0);
jassert (spec.numChannels > 0);
sampleRate = spec.sampleRate;
firstStageCompressor.prepare (spec);
secondStageCompressor.prepare (spec);
update();
reset();
}
template <typename SampleType>
void Limiter<SampleType>::reset()
{
firstStageCompressor.reset();
secondStageCompressor.reset();
outputVolume.reset (sampleRate, 0.001);
}
//==============================================================================
template <typename SampleType>
void Limiter<SampleType>::update()
{
firstStageCompressor.setThreshold ((SampleType) -10.0);
firstStageCompressor.setRatio ((SampleType) 4.0);
firstStageCompressor.setAttack ((SampleType) 2.0);
firstStageCompressor.setRelease ((SampleType) 200.0);
secondStageCompressor.setThreshold (thresholddB);
secondStageCompressor.setRatio ((SampleType) 1000.0);
secondStageCompressor.setAttack ((SampleType) 0.001);
secondStageCompressor.setRelease (releaseTime);
auto ratioInverse = (SampleType) (1.0 / 4.0);
auto gain = (SampleType) std::pow (10.0, 10.0 * (1.0 - ratioInverse) / 40.0);
gain *= Decibels::decibelsToGain (-thresholddB, (SampleType) -100.0);
outputVolume.setTargetValue (gain);
}
//==============================================================================
template class Limiter<float>;
template class Limiter<double>;
} // namespace juce::dsp
juce::Decibels::decibelsToGain
static Type decibelsToGain(Type decibels, Type minusInfinityDb=Type(defaultMinusInfinitydB))
Definition juce_Decibels.h:42
juce::dsp::Limiter::setThreshold
void setThreshold(SampleType newThreshold)
Definition juce_Limiter.cpp:31
juce::dsp::Limiter::prepare
void prepare(const ProcessSpec &spec)
Definition juce_Limiter.cpp:46
juce::dsp::Limiter::setRelease
void setRelease(SampleType newRelease)
Definition juce_Limiter.cpp:38
juce::dsp::Limiter::reset
void reset()
Definition juce_Limiter.cpp:61
juce::dsp::ProcessSpec
Definition juce_ProcessContext.h:36
juce::dsp::ProcessSpec::numChannels
uint32 numChannels
Definition juce_ProcessContext.h:44
juce::dsp::ProcessSpec::sampleRate
double sampleRate
Definition juce_ProcessContext.h:38