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juce_Panner.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>
Panner<SampleType>::Panner()
{
update();
reset();
}
//==============================================================================
template <typename SampleType>
void Panner<SampleType>::setRule (Rule newRule)
{
currentRule = newRule;
update();
}
template <typename SampleType>
void Panner<SampleType>::setPan (SampleType newPan)
{
jassert (newPan >= -1.0 && newPan <= 1.0);
pan = jlimit (static_cast<SampleType> (-1.0), static_cast<SampleType> (1.0), newPan);
update();
}
//==============================================================================
template <typename SampleType>
void Panner<SampleType>::prepare (const ProcessSpec& spec)
{
jassert (spec.sampleRate > 0);
jassert (spec.numChannels > 0);
sampleRate = spec.sampleRate;
reset();
}
template <typename SampleType>
void Panner<SampleType>::reset()
{
leftVolume .reset (sampleRate, 0.05);
rightVolume.reset (sampleRate, 0.05);
}
//==============================================================================
template <typename SampleType>
void Panner<SampleType>::update()
{
SampleType leftValue, rightValue, boostValue;
auto normalisedPan = static_cast<SampleType> (0.5) * (pan + static_cast<SampleType> (1.0));
switch (currentRule)
{
case Rule::balanced:
leftValue = jmin (static_cast<SampleType> (0.5), static_cast<SampleType> (1.0) - normalisedPan);
rightValue = jmin (static_cast<SampleType> (0.5), normalisedPan);
boostValue = static_cast<SampleType> (2.0);
break;
case Rule::linear:
leftValue = static_cast<SampleType> (1.0) - normalisedPan;
rightValue = normalisedPan;
boostValue = static_cast<SampleType> (2.0);
break;
case Rule::sin3dB:
leftValue = static_cast<SampleType> (std::sin (0.5 * MathConstants<double>::pi * (1.0 - normalisedPan)));
rightValue = static_cast<SampleType> (std::sin (0.5 * MathConstants<double>::pi * normalisedPan));
boostValue = std::sqrt (static_cast<SampleType> (2.0));
break;
case Rule::sin4p5dB:
leftValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * (1.0 - normalisedPan)), 1.5));
rightValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * normalisedPan), 1.5));
boostValue = static_cast<SampleType> (std::pow (2.0, 3.0 / 4.0));
break;
case Rule::sin6dB:
leftValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * (1.0 - normalisedPan)), 2.0));
rightValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * normalisedPan), 2.0));
boostValue = static_cast<SampleType> (2.0);
break;
case Rule::squareRoot3dB:
leftValue = std::sqrt (static_cast<SampleType> (1.0) - normalisedPan);
rightValue = std::sqrt (normalisedPan);
boostValue = std::sqrt (static_cast<SampleType> (2.0));
break;
case Rule::squareRoot4p5dB:
leftValue = static_cast<SampleType> (std::pow (std::sqrt (1.0 - normalisedPan), 1.5));
rightValue = static_cast<SampleType> (std::pow (std::sqrt (normalisedPan), 1.5));
boostValue = static_cast<SampleType> (std::pow (2.0, 3.0 / 4.0));
break;
default:
leftValue = jmin (static_cast<SampleType> (0.5), static_cast<SampleType> (1.0) - normalisedPan);
rightValue = jmin (static_cast<SampleType> (0.5), normalisedPan);
boostValue = static_cast<SampleType> (2.0);
break;
}
leftVolume .setTargetValue (leftValue * boostValue);
rightVolume.setTargetValue (rightValue * boostValue);
}
//==============================================================================
template class Panner<float>;
template class Panner<double>;
} // namespace juce::dsp
juce::dsp::Panner::prepare
void prepare(const ProcessSpec &spec)
Definition juce_Panner.cpp:56
juce::dsp::Panner::setPan
void setPan(SampleType newPan)
Definition juce_Panner.cpp:46
juce::dsp::Panner::reset
void reset()
Definition juce_Panner.cpp:67
juce::dsp::Panner::setRule
void setRule(Rule newRule)
Definition juce_Panner.cpp:39
juce::dsp::Panner::Panner
Panner()
Definition juce_Panner.cpp:31
juce::MathConstants::pi
static constexpr FloatType pi
Definition juce_MathsFunctions.h:141
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