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juce_ADSR_test.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.
The code included in this file is provided under the terms of the ISC license
http://www.isc.org/downloads/software-support-policy/isc-license. Permission
To use, copy, modify, and/or distribute this software for any purpose with or
without fee is hereby granted provided that the above copyright notice and
this permission notice appear in all copies.
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
{
struct ADSRTests final : public UnitTest
{
ADSRTests() : UnitTest ("ADSR", UnitTestCategories::audio) {}
void runTest() override
{
constexpr double sampleRate = 44100.0;
const ADSR::Parameters parameters { 0.1f, 0.1f, 0.5f, 0.1f };
ADSR adsr;
adsr.setSampleRate (sampleRate);
adsr.setParameters (parameters);
beginTest ("Idle");
{
adsr.reset();
expect (! adsr.isActive());
expectEquals (adsr.getNextSample(), 0.0f);
}
beginTest ("Attack");
{
adsr.reset();
adsr.noteOn();
expect (adsr.isActive());
auto buffer = getTestBuffer (sampleRate, parameters.attack);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isIncreasing (buffer));
}
beginTest ("Decay");
{
adsr.reset();
adsr.noteOn();
advanceADSR (adsr, roundToInt (parameters.attack * sampleRate));
auto buffer = getTestBuffer (sampleRate, parameters.decay);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isDecreasing (buffer));
}
beginTest ("Sustain");
{
adsr.reset();
adsr.noteOn();
advanceADSR (adsr, roundToInt ((parameters.attack + parameters.decay + 0.01) * sampleRate));
auto random = getRandom();
for (int numTests = 0; numTests < 100; ++numTests)
{
const auto sustainLevel = random.nextFloat();
const auto sustainLength = jmax (0.1f, random.nextFloat());
adsr.setParameters ({ parameters.attack, parameters.decay, sustainLevel, parameters.release });
auto buffer = getTestBuffer (sampleRate, sustainLength);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isSustained (buffer, sustainLevel));
}
}
beginTest ("Release");
{
adsr.reset();
adsr.noteOn();
advanceADSR (adsr, roundToInt ((parameters.attack + parameters.decay) * sampleRate));
adsr.noteOff();
auto buffer = getTestBuffer (sampleRate, parameters.release);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isDecreasing (buffer));
}
beginTest ("Zero-length attack jumps to decay");
{
adsr.reset();
adsr.setParameters ({ 0.0f, parameters.decay, parameters.sustain, parameters.release });
adsr.noteOn();
auto buffer = getTestBuffer (sampleRate, parameters.decay);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isDecreasing (buffer));
}
beginTest ("Zero-length decay jumps to sustain");
{
adsr.reset();
adsr.setParameters ({ parameters.attack, 0.0f, parameters.sustain, parameters.release });
adsr.noteOn();
advanceADSR (adsr, roundToInt (parameters.attack * sampleRate));
adsr.getNextSample();
expectEquals (adsr.getNextSample(), parameters.sustain);
auto buffer = getTestBuffer (sampleRate, 1);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isSustained (buffer, parameters.sustain));
}
beginTest ("Zero-length attack and decay jumps to sustain");
{
adsr.reset();
adsr.setParameters ({ 0.0f, 0.0f, parameters.sustain, parameters.release });
adsr.noteOn();
expectEquals (adsr.getNextSample(), parameters.sustain);
auto buffer = getTestBuffer (sampleRate, 1);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isSustained (buffer, parameters.sustain));
}
beginTest ("Zero-length attack and decay releases correctly");
{
adsr.reset();
adsr.setParameters ({ 0.0f, 0.0f, parameters.sustain, parameters.release });
adsr.noteOn();
adsr.noteOff();
auto buffer = getTestBuffer (sampleRate, parameters.release);
adsr.applyEnvelopeToBuffer (buffer, 0, buffer.getNumSamples());
expect (isDecreasing (buffer));
}
beginTest ("Zero-length release resets to idle");
{
adsr.reset();
adsr.setParameters ({ parameters.attack, parameters.decay, parameters.sustain, 0.0f });
adsr.noteOn();
advanceADSR (adsr, roundToInt ((parameters.attack + parameters.decay) * sampleRate));
adsr.noteOff();
expect (! adsr.isActive());
}
}
static void advanceADSR (ADSR& adsr, int numSamplesToAdvance)
{
while (--numSamplesToAdvance >= 0)
adsr.getNextSample();
}
static AudioBuffer<float> getTestBuffer (double sampleRate, float lengthInSeconds)
{
AudioBuffer<float> buffer { 2, roundToInt (lengthInSeconds * sampleRate) };
for (int channel = 0; channel < buffer.getNumChannels(); ++channel)
for (int sample = 0; sample < buffer.getNumSamples(); ++sample)
buffer.setSample (channel, sample, 1.0f);
return buffer;
}
static bool isIncreasing (const AudioBuffer<float>& b)
{
jassert (b.getNumChannels() > 0 && b.getNumSamples() > 0);
for (int channel = 0; channel < b.getNumChannels(); ++channel)
{
float previousSample = -1.0f;
for (int sample = 0; sample < b.getNumSamples(); ++sample)
{
const auto currentSample = b.getSample (channel, sample);
if (currentSample <= previousSample)
return false;
previousSample = currentSample;
}
}
return true;
}
static bool isDecreasing (const AudioBuffer<float>& b)
{
jassert (b.getNumChannels() > 0 && b.getNumSamples() > 0);
for (int channel = 0; channel < b.getNumChannels(); ++channel)
{
float previousSample = std::numeric_limits<float>::max();
for (int sample = 0; sample < b.getNumSamples(); ++sample)
{
const auto currentSample = b.getSample (channel, sample);
if (currentSample >= previousSample)
return false;
previousSample = currentSample;
}
}
return true;
}
static bool isSustained (const AudioBuffer<float>& b, float sustainLevel)
{
jassert (b.getNumChannels() > 0 && b.getNumSamples() > 0);
for (int channel = 0; channel < b.getNumChannels(); ++channel)
if (b.findMinMax (channel, 0, b.getNumSamples()) != Range<float> { sustainLevel, sustainLevel })
return false;
return true;
}
};
static ADSRTests adsrTests;
} // namespace juce
juce::UnitTest
Definition juce_UnitTest.h:70
juce::UnitTest::expectEquals
void expectEquals(ValueType actual, ValueType expected, String failureMessage=String())
Definition juce_UnitTest.h:151
juce::UnitTest::UnitTest
UnitTest(const String &name, const String &category=String())
Definition juce_UnitTest.cpp:26
juce::UnitTest::beginTest
void beginTest(const String &testName)
Definition juce_UnitTest.cpp:89
juce::UnitTest::expect
void expect(bool testResult, const String &failureMessage=String())
Definition juce_UnitTest.cpp:97
juce::UnitTest::runTest
virtual void runTest()=0
juce::UnitTest::getRandom
Random getRandom() const
Definition juce_UnitTest.cpp:108