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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>
DryWetMixer<SampleType>::DryWetMixer()
: DryWetMixer (0)
{
}
template <typename SampleType>
DryWetMixer<SampleType>::DryWetMixer (int maximumWetLatencyInSamplesIn)
: dryDelayLine (maximumWetLatencyInSamplesIn),
maximumWetLatencyInSamples (maximumWetLatencyInSamplesIn)
{
dryDelayLine.setDelay (0);
update();
reset();
}
//==============================================================================
template <typename SampleType>
void DryWetMixer<SampleType>::setMixingRule (MixingRule newRule)
{
currentMixingRule = newRule;
update();
}
template <typename SampleType>
void DryWetMixer<SampleType>::setWetMixProportion (SampleType newWetMixProportion)
{
jassert (isPositiveAndNotGreaterThan (newWetMixProportion, 1.0));
mix = jlimit (static_cast<SampleType> (0.0), static_cast<SampleType> (1.0), newWetMixProportion);
update();
}
template <typename SampleType>
void DryWetMixer<SampleType>::setWetLatency (SampleType wetLatencySamples)
{
dryDelayLine.setDelay (wetLatencySamples);
}
//==============================================================================
template <typename SampleType>
void DryWetMixer<SampleType>::prepare (const ProcessSpec& spec)
{
jassert (spec.sampleRate > 0);
jassert (spec.numChannels > 0);
sampleRate = spec.sampleRate;
dryDelayLine.prepare (spec);
bufferDry.setSize ((int) spec.numChannels, (int) spec.maximumBlockSize, false, false, true);
update();
reset();
}
template <typename SampleType>
void DryWetMixer<SampleType>::reset()
{
dryVolume.reset (sampleRate, 0.05);
wetVolume.reset (sampleRate, 0.05);
dryDelayLine.reset();
fifo = SingleThreadedAbstractFifo (nextPowerOfTwo (bufferDry.getNumSamples()));
bufferDry.setSize (bufferDry.getNumChannels(), fifo.getSize(), false, false, true);
}
//==============================================================================
template <typename SampleType>
void DryWetMixer<SampleType>::pushDrySamples (const AudioBlock<const SampleType> drySamples)
{
jassert (drySamples.getNumChannels() <= (size_t) bufferDry.getNumChannels());
jassert (drySamples.getNumSamples() <= (size_t) fifo.getRemainingSpace());
auto offset = 0;
for (const auto& range : fifo.write ((int) drySamples.getNumSamples()))
{
if (range.getLength() == 0)
continue;
auto block = AudioBlock<SampleType> (bufferDry).getSubsetChannelBlock (0, drySamples.getNumChannels())
.getSubBlock ((size_t) range.getStart(), (size_t) range.getLength());
auto inputBlock = drySamples.getSubBlock ((size_t) offset, (size_t) range.getLength());
if (maximumWetLatencyInSamples == 0)
block.copyFrom (inputBlock);
else
dryDelayLine.process (ProcessContextNonReplacing<SampleType> (inputBlock, block));
offset += range.getLength();
}
}
template <typename SampleType>
void DryWetMixer<SampleType>::mixWetSamples (AudioBlock<SampleType> inOutBlock)
{
inOutBlock.multiplyBy (wetVolume);
jassert (inOutBlock.getNumSamples() <= (size_t) fifo.getNumReadable());
auto offset = 0;
for (const auto& range : fifo.read ((int) inOutBlock.getNumSamples()))
{
if (range.getLength() == 0)
continue;
auto block = AudioBlock<SampleType> (bufferDry).getSubsetChannelBlock (0, inOutBlock.getNumChannels())
.getSubBlock ((size_t) range.getStart(), (size_t) range.getLength());
block.multiplyBy (dryVolume);
inOutBlock.getSubBlock ((size_t) offset).add (block);
offset += range.getLength();
}
}
//==============================================================================
template <typename SampleType>
void DryWetMixer<SampleType>::update()
{
SampleType dryValue, wetValue;
switch (currentMixingRule)
{
case MixingRule::balanced:
dryValue = static_cast<SampleType> (2.0) * jmin (static_cast<SampleType> (0.5), static_cast<SampleType> (1.0) - mix);
wetValue = static_cast<SampleType> (2.0) * jmin (static_cast<SampleType> (0.5), mix);
break;
case MixingRule::linear:
dryValue = static_cast<SampleType> (1.0) - mix;
wetValue = mix;
break;
case MixingRule::sin3dB:
dryValue = static_cast<SampleType> (std::sin (0.5 * MathConstants<double>::pi * (1.0 - mix)));
wetValue = static_cast<SampleType> (std::sin (0.5 * MathConstants<double>::pi * mix));
break;
case MixingRule::sin4p5dB:
dryValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * (1.0 - mix)), 1.5));
wetValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * mix), 1.5));
break;
case MixingRule::sin6dB:
dryValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * (1.0 - mix)), 2.0));
wetValue = static_cast<SampleType> (std::pow (std::sin (0.5 * MathConstants<double>::pi * mix), 2.0));
break;
case MixingRule::squareRoot3dB:
dryValue = std::sqrt (static_cast<SampleType> (1.0) - mix);
wetValue = std::sqrt (mix);
break;
case MixingRule::squareRoot4p5dB:
dryValue = static_cast<SampleType> (std::pow (std::sqrt (1.0 - mix), 1.5));
wetValue = static_cast<SampleType> (std::pow (std::sqrt (mix), 1.5));
break;
default:
dryValue = jmin (static_cast<SampleType> (0.5), static_cast<SampleType> (1.0) - mix);
wetValue = jmin (static_cast<SampleType> (0.5), mix);
break;
}
dryVolume.setTargetValue (dryValue);
wetVolume.setTargetValue (wetValue);
}
//==============================================================================
template class DryWetMixer<float>;
template class DryWetMixer<double>;
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
struct DryWetMixerTests final : public UnitTest
{
DryWetMixerTests() : UnitTest ("DryWetMixer", UnitTestCategories::dsp) {}
enum class Kind { down, up };
static auto getRampBuffer (ProcessSpec spec, Kind kind)
{
AudioBuffer<float> buffer ((int) spec.numChannels, (int) spec.maximumBlockSize);
for (uint32_t sample = 0; sample < spec.maximumBlockSize; ++sample)
{
for (uint32_t channel = 0; channel < spec.numChannels; ++channel)
{
const auto ramp = kind == Kind::up ? sample : spec.maximumBlockSize - sample;
buffer.setSample ((int) channel,
(int) sample,
jmap ((float) ramp, 0.0f, (float) spec.maximumBlockSize, 0.0f, 1.0f));
}
}
return buffer;
}
void runTest() override
{
constexpr ProcessSpec spec { 44100.0, 512, 2 };
constexpr auto numBlocks = 5;
const auto wetBuffer = getRampBuffer (spec, Kind::up);
const auto dryBuffer = getRampBuffer (spec, Kind::down);
for (auto maxLatency : { 0, 100, 200, 512 })
{
beginTest ("Mixer can push multiple small buffers");
{
DryWetMixer<float> mixer (maxLatency);
mixer.setWetMixProportion (0.5f);
mixer.prepare (spec);
for (auto block = 0; block < numBlocks; ++block)
{
// Push samples one-by-one
for (uint32_t sample = 0; sample < spec.maximumBlockSize; ++sample)
mixer.pushDrySamples (AudioBlock<const float> (dryBuffer).getSubBlock (sample, 1));
// Mix wet samples in one go
auto outputBlock = wetBuffer;
mixer.mixWetSamples ({ outputBlock });
// The output block should contain the wet and dry samples averaged
for (uint32_t sample = 0; sample < spec.maximumBlockSize; ++sample)
{
for (uint32_t channel = 0; channel < spec.numChannels; ++channel)
{
const auto outputValue = outputBlock.getSample ((int) channel, (int) sample);
expectWithinAbsoluteError (outputValue, 0.5f, 0.0001f);
}
}
}
}
beginTest ("Mixer can pop multiple small buffers");
{
DryWetMixer<float> mixer (maxLatency);
mixer.setWetMixProportion (0.5f);
mixer.prepare (spec);
for (auto block = 0; block < numBlocks; ++block)
{
// Push samples in one go
mixer.pushDrySamples ({ dryBuffer });
// Process wet samples one-by-one
for (uint32_t sample = 0; sample < spec.maximumBlockSize; ++sample)
{
AudioBuffer<float> outputBlock ((int) spec.numChannels, 1);
AudioBlock<const float> (wetBuffer).getSubBlock (sample, 1).copyTo (outputBlock);
mixer.mixWetSamples ({ outputBlock });
// The output block should contain the wet and dry samples averaged
for (uint32_t channel = 0; channel < spec.numChannels; ++channel)
{
const auto outputValue = outputBlock.getSample ((int) channel, 0);
expectWithinAbsoluteError (outputValue, 0.5f, 0.0001f);
}
}
}
}
beginTest ("Mixer can push and pop multiple small buffers");
{
DryWetMixer<float> mixer (maxLatency);
mixer.setWetMixProportion (0.5f);
mixer.prepare (spec);
for (auto block = 0; block < numBlocks; ++block)
{
// Push dry samples and process wet samples one-by-one
for (uint32_t sample = 0; sample < spec.maximumBlockSize; ++sample)
{
mixer.pushDrySamples (AudioBlock<const float> (dryBuffer).getSubBlock (sample, 1));
AudioBuffer<float> outputBlock ((int) spec.numChannels, 1);
AudioBlock<const float> (wetBuffer).getSubBlock (sample, 1).copyTo (outputBlock);
mixer.mixWetSamples ({ outputBlock });
// The output block should contain the wet and dry samples averaged
for (uint32_t channel = 0; channel < spec.numChannels; ++channel)
{
const auto outputValue = outputBlock.getSample ((int) channel, 0);
expectWithinAbsoluteError (outputValue, 0.5f, 0.0001f);
}
}
}
}
beginTest ("Mixer can push and pop full-sized blocks after encountering a shorter block");
{
DryWetMixer<float> mixer (maxLatency);
mixer.setWetMixProportion (0.5f);
mixer.prepare (spec);
constexpr auto shortBlockLength = spec.maximumBlockSize / 2;
AudioBuffer<float> shortBlock (spec.numChannels, shortBlockLength);
mixer.pushDrySamples (AudioBlock<const float> (dryBuffer).getSubBlock (shortBlockLength));
mixer.mixWetSamples ({ shortBlock });
for (auto block = 0; block < numBlocks; ++block)
{
// Push a full block of dry samples
mixer.pushDrySamples ({ dryBuffer });
// Mix a full block of wet samples
auto outputBlock = wetBuffer;
mixer.mixWetSamples ({ outputBlock });
// The output block should contain the wet and dry samples averaged
for (uint32_t sample = 0; sample < spec.maximumBlockSize; ++sample)
{
for (uint32_t channel = 0; channel < spec.numChannels; ++channel)
{
const auto outputValue = outputBlock.getSample ((int) channel, (int) sample);
expectWithinAbsoluteError (outputValue, 0.5f, 0.0001f);
}
}
}
}
}
}
};
static const DryWetMixerTests dryWetMixerTests;
#endif
} // namespace juce::dsp
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