juce_Phaser.cpp

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 /*
  ==============================================================================
 
   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>
Phaser<SampleType>::Phaser()
{
    auto oscFunction = [] (SampleType x) { return std::sin (x); };
    osc.initialise (oscFunction);
 
    for (auto n = 0; n < numStages; ++n)
    {
        filters.add (new FirstOrderTPTFilter<SampleType>());
        filters[n]->setType (FirstOrderTPTFilterType::allpass);
    }
 
    dryWet.setMixingRule (DryWetMixingRule::linear);
}
 
template <typename SampleType>
void Phaser<SampleType>::setRate (SampleType newRateHz)
{
    jassert (isPositiveAndBelow (newRateHz, static_cast<SampleType> (100.0)));
 
    rate = newRateHz;
    update();
}
 
template <typename SampleType>
void Phaser<SampleType>::setDepth (SampleType newDepth)
{
    jassert (isPositiveAndNotGreaterThan (newDepth, static_cast<SampleType> (1.0)));
 
    depth = newDepth;
    update();
}
 
template <typename SampleType>
void Phaser<SampleType>::setCentreFrequency (SampleType newCentreHz)
{
    jassert (isPositiveAndBelow (newCentreHz, static_cast<SampleType> (sampleRate * 0.5)));
 
    centreFrequency = newCentreHz;
    normCentreFrequency = mapFromLog10 (centreFrequency, static_cast<SampleType> (20.0), static_cast<SampleType> (jmin (20000.0, 0.49 * sampleRate)));
}
 
template <typename SampleType>
void Phaser<SampleType>::setFeedback (SampleType newFeedback)
{
    jassert (newFeedback >= static_cast<SampleType> (-1.0) && newFeedback <= static_cast<SampleType> (1.0));
 
    feedback = newFeedback;
    update();
}
 
template <typename SampleType>
void Phaser<SampleType>::setMix (SampleType newMix)
{
    jassert (isPositiveAndNotGreaterThan (newMix, static_cast<SampleType> (1.0)));
 
    mix = newMix;
    update();
}
 
//==============================================================================
template <typename SampleType>
void Phaser<SampleType>::prepare (const ProcessSpec& spec)
{
    jassert (spec.sampleRate > 0);
    jassert (spec.numChannels > 0);
 
    sampleRate = spec.sampleRate;
 
    for (auto n = 0; n < numStages; ++n)
        filters[n]->prepare (spec);
 
    dryWet.prepare (spec);
    feedbackVolume.resize (spec.numChannels);
    lastOutput.resize (spec.numChannels);
 
    auto specDown = spec;
    specDown.sampleRate /= (double) maxUpdateCounter;
    specDown.maximumBlockSize = specDown.maximumBlockSize / (uint32) maxUpdateCounter + 1;
 
    osc.prepare (specDown);
    bufferFrequency.setSize (1, (int) specDown.maximumBlockSize, false, false, true);
 
    update();
    reset();
}
 
template <typename SampleType>
void Phaser<SampleType>::reset()
{
    std::fill (lastOutput.begin(), lastOutput.end(), static_cast<SampleType> (0));
 
    for (auto n = 0; n < numStages; ++n)
        filters[n]->reset();
 
    osc.reset();
    dryWet.reset();
 
    oscVolume.reset (sampleRate / (double) maxUpdateCounter, 0.05);
 
    for (auto& vol : feedbackVolume)
        vol.reset (sampleRate, 0.05);
 
    updateCounter = 0;
}
 
template <typename SampleType>
void Phaser<SampleType>::update()
{
    osc.setFrequency (rate);
    oscVolume.setTargetValue (depth * (SampleType) 0.5);
    dryWet.setWetMixProportion (mix);
 
    for (auto& vol : feedbackVolume)
        vol.setTargetValue (feedback);
}
 
//==============================================================================
template class Phaser<float>;
template class Phaser<double>;
 
} // namespace juce::dsp