paulxstretch/deps/juce/modules/juce_audio_basics/utilities/juce_SmoothedValue.h
essej 25bd5d8adb git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce
subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"
2022-04-18 17:51:22 -04:00

632 lines
21 KiB
C++

/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2020 - 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
{
//==============================================================================
/**
A base class for the smoothed value classes.
This class is used to provide common functionality to the SmoothedValue and
dsp::LogRampedValue classes.
@tags{Audio}
*/
template <typename SmoothedValueType>
class SmoothedValueBase
{
private:
//==============================================================================
template <typename T> struct FloatTypeHelper;
template <template <typename> class SmoothedValueClass, typename FloatType>
struct FloatTypeHelper <SmoothedValueClass <FloatType>>
{
using Type = FloatType;
};
template <template <typename, typename> class SmoothedValueClass, typename FloatType, typename SmoothingType>
struct FloatTypeHelper <SmoothedValueClass <FloatType, SmoothingType>>
{
using Type = FloatType;
};
public:
using FloatType = typename FloatTypeHelper<SmoothedValueType>::Type;
//==============================================================================
/** Constructor. */
SmoothedValueBase() = default;
virtual ~SmoothedValueBase() {}
//==============================================================================
/** Returns true if the current value is currently being interpolated. */
bool isSmoothing() const noexcept { return countdown > 0; }
/** Returns the current value of the ramp. */
FloatType getCurrentValue() const noexcept { return currentValue; }
//==============================================================================
/** Returns the target value towards which the smoothed value is currently moving. */
FloatType getTargetValue() const noexcept { return target; }
/** Sets the current value and the target value.
@param newValue the new value to take
*/
void setCurrentAndTargetValue (FloatType newValue)
{
target = currentValue = newValue;
countdown = 0;
}
//==============================================================================
/** Applies a smoothed gain to a stream of samples
S[i] *= gain
@param samples Pointer to a raw array of samples
@param numSamples Length of array of samples
*/
void applyGain (FloatType* samples, int numSamples) noexcept
{
jassert (numSamples >= 0);
if (isSmoothing())
{
for (int i = 0; i < numSamples; ++i)
samples[i] *= getNextSmoothedValue();
}
else
{
FloatVectorOperations::multiply (samples, target, numSamples);
}
}
/** Computes output as a smoothed gain applied to a stream of samples.
Sout[i] = Sin[i] * gain
@param samplesOut A pointer to a raw array of output samples
@param samplesIn A pointer to a raw array of input samples
@param numSamples The length of the array of samples
*/
void applyGain (FloatType* samplesOut, const FloatType* samplesIn, int numSamples) noexcept
{
jassert (numSamples >= 0);
if (isSmoothing())
{
for (int i = 0; i < numSamples; ++i)
samplesOut[i] = samplesIn[i] * getNextSmoothedValue();
}
else
{
FloatVectorOperations::multiply (samplesOut, samplesIn, target, numSamples);
}
}
/** Applies a smoothed gain to a buffer */
void applyGain (AudioBuffer<FloatType>& buffer, int numSamples) noexcept
{
jassert (numSamples >= 0);
if (isSmoothing())
{
if (buffer.getNumChannels() == 1)
{
auto* samples = buffer.getWritePointer (0);
for (int i = 0; i < numSamples; ++i)
samples[i] *= getNextSmoothedValue();
}
else
{
for (auto i = 0; i < numSamples; ++i)
{
auto gain = getNextSmoothedValue();
for (int channel = 0; channel < buffer.getNumChannels(); channel++)
buffer.setSample (channel, i, buffer.getSample (channel, i) * gain);
}
}
}
else
{
buffer.applyGain (0, numSamples, target);
}
}
private:
//==============================================================================
FloatType getNextSmoothedValue() noexcept
{
return static_cast <SmoothedValueType*> (this)->getNextValue();
}
protected:
//==============================================================================
FloatType currentValue = 0;
FloatType target = currentValue;
int countdown = 0;
};
//==============================================================================
/**
A namespace containing a set of types used for specifying the smoothing
behaviour of the SmoothedValue class.
For example:
@code
SmoothedValue<float, ValueSmoothingTypes::Multiplicative> frequency (1.0f);
@endcode
*/
namespace ValueSmoothingTypes
{
/**
Used to indicate a linear smoothing between values.
@tags{Audio}
*/
struct Linear {};
/**
Used to indicate a smoothing between multiplicative values.
@tags{Audio}
*/
struct Multiplicative {};
}
//==============================================================================
/**
A utility class for values that need smoothing to avoid audio glitches.
A ValueSmoothingTypes::Linear template parameter selects linear smoothing,
which increments the SmoothedValue linearly towards its target value.
@code
SmoothedValue<float, ValueSmoothingTypes::Linear> yourSmoothedValue;
@endcode
A ValueSmoothingTypes::Multiplicative template parameter selects
multiplicative smoothing increments towards the target value.
@code
SmoothedValue<float, ValueSmoothingTypes::Multiplicative> yourSmoothedValue;
@endcode
Multiplicative smoothing is useful when you are dealing with
exponential/logarithmic values like volume in dB or frequency in Hz. For
example a 12 step ramp from 440.0 Hz (A4) to 880.0 Hz (A5) will increase the
frequency with an equal temperament tuning across the octave. A 10 step
smoothing from 1.0 (0 dB) to 3.16228 (10 dB) will increase the value in
increments of 1 dB.
Note that when you are using multiplicative smoothing you cannot ever reach a
target value of zero!
@tags{Audio}
*/
template <typename FloatType, typename SmoothingType = ValueSmoothingTypes::Linear>
class SmoothedValue : public SmoothedValueBase <SmoothedValue <FloatType, SmoothingType>>
{
public:
//==============================================================================
/** Constructor. */
SmoothedValue() noexcept
: SmoothedValue ((FloatType) (std::is_same<SmoothingType, ValueSmoothingTypes::Linear>::value ? 0 : 1))
{
}
/** Constructor. */
SmoothedValue (FloatType initialValue) noexcept
{
// Multiplicative smoothed values cannot ever reach 0!
jassert (! (std::is_same<SmoothingType, ValueSmoothingTypes::Multiplicative>::value && initialValue == 0));
// Visual Studio can't handle base class initialisation with CRTP
this->currentValue = initialValue;
this->target = this->currentValue;
}
//==============================================================================
/** Reset to a new sample rate and ramp length.
@param sampleRate The sample rate
@param rampLengthInSeconds The duration of the ramp in seconds
*/
void reset (double sampleRate, double rampLengthInSeconds) noexcept
{
jassert (sampleRate > 0 && rampLengthInSeconds >= 0);
reset ((int) std::floor (rampLengthInSeconds * sampleRate));
}
/** Set a new ramp length directly in samples.
@param numSteps The number of samples over which the ramp should be active
*/
void reset (int numSteps) noexcept
{
stepsToTarget = numSteps;
this->setCurrentAndTargetValue (this->target);
}
//==============================================================================
/** Set the next value to ramp towards.
@param newValue The new target value
*/
void setTargetValue (FloatType newValue) noexcept
{
if (newValue == this->target)
return;
if (stepsToTarget <= 0)
{
this->setCurrentAndTargetValue (newValue);
return;
}
// Multiplicative smoothed values cannot ever reach 0!
jassert (! (std::is_same<SmoothingType, ValueSmoothingTypes::Multiplicative>::value && newValue == 0));
this->target = newValue;
this->countdown = stepsToTarget;
setStepSize();
}
//==============================================================================
/** Compute the next value.
@returns Smoothed value
*/
FloatType getNextValue() noexcept
{
if (! this->isSmoothing())
return this->target;
--(this->countdown);
if (this->isSmoothing())
setNextValue();
else
this->currentValue = this->target;
return this->currentValue;
}
//==============================================================================
/** Skip the next numSamples samples.
This is identical to calling getNextValue numSamples times. It returns
the new current value.
@see getNextValue
*/
FloatType skip (int numSamples) noexcept
{
if (numSamples >= this->countdown)
{
this->setCurrentAndTargetValue (this->target);
return this->target;
}
skipCurrentValue (numSamples);
this->countdown -= numSamples;
return this->currentValue;
}
//==============================================================================
#ifndef DOXYGEN
/** Using the new methods:
lsv.setValue (x, false); -> lsv.setTargetValue (x);
lsv.setValue (x, true); -> lsv.setCurrentAndTargetValue (x);
@param newValue The new target value
@param force If true, the value will be set immediately, bypassing the ramp
*/
[[deprecated ("Use setTargetValue and setCurrentAndTargetValue instead.")]]
void setValue (FloatType newValue, bool force = false) noexcept
{
if (force)
{
this->setCurrentAndTargetValue (newValue);
return;
}
setTargetValue (newValue);
}
#endif
private:
//==============================================================================
template <typename T>
using LinearVoid = typename std::enable_if <std::is_same <T, ValueSmoothingTypes::Linear>::value, void>::type;
template <typename T>
using MultiplicativeVoid = typename std::enable_if <std::is_same <T, ValueSmoothingTypes::Multiplicative>::value, void>::type;
//==============================================================================
template <typename T = SmoothingType>
LinearVoid<T> setStepSize() noexcept
{
step = (this->target - this->currentValue) / (FloatType) this->countdown;
}
template <typename T = SmoothingType>
MultiplicativeVoid<T> setStepSize()
{
step = std::exp ((std::log (std::abs (this->target)) - std::log (std::abs (this->currentValue))) / (FloatType) this->countdown);
}
//==============================================================================
template <typename T = SmoothingType>
LinearVoid<T> setNextValue() noexcept
{
this->currentValue += step;
}
template <typename T = SmoothingType>
MultiplicativeVoid<T> setNextValue() noexcept
{
this->currentValue *= step;
}
//==============================================================================
template <typename T = SmoothingType>
LinearVoid<T> skipCurrentValue (int numSamples) noexcept
{
this->currentValue += step * (FloatType) numSamples;
}
template <typename T = SmoothingType>
MultiplicativeVoid<T> skipCurrentValue (int numSamples)
{
this->currentValue *= (FloatType) std::pow (step, numSamples);
}
//==============================================================================
FloatType step = FloatType();
int stepsToTarget = 0;
};
template <typename FloatType>
using LinearSmoothedValue = SmoothedValue <FloatType, ValueSmoothingTypes::Linear>;
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
template <class SmoothedValueType>
class CommonSmoothedValueTests : public UnitTest
{
public:
CommonSmoothedValueTests()
: UnitTest ("CommonSmoothedValueTests", UnitTestCategories::smoothedValues)
{}
void runTest() override
{
beginTest ("Initial state");
{
SmoothedValueType sv;
auto value = sv.getCurrentValue();
expectEquals (sv.getTargetValue(), value);
sv.getNextValue();
expectEquals (sv.getCurrentValue(), value);
expect (! sv.isSmoothing());
}
beginTest ("Resetting");
{
auto initialValue = 15.0f;
SmoothedValueType sv (initialValue);
sv.reset (3);
expectEquals (sv.getCurrentValue(), initialValue);
auto targetValue = initialValue + 1.0f;
sv.setTargetValue (targetValue);
expectEquals (sv.getTargetValue(), targetValue);
expectEquals (sv.getCurrentValue(), initialValue);
expect (sv.isSmoothing());
auto currentValue = sv.getNextValue();
expect (currentValue > initialValue);
expectEquals (sv.getCurrentValue(), currentValue);
expectEquals (sv.getTargetValue(), targetValue);
expect (sv.isSmoothing());
sv.reset (5);
expectEquals (sv.getCurrentValue(), targetValue);
expectEquals (sv.getTargetValue(), targetValue);
expect (! sv.isSmoothing());
sv.getNextValue();
expectEquals (sv.getCurrentValue(), targetValue);
sv.setTargetValue (1.5f);
sv.getNextValue();
float newStart = 0.2f;
sv.setCurrentAndTargetValue (newStart);
expectEquals (sv.getNextValue(), newStart);
expectEquals (sv.getTargetValue(), newStart);
expectEquals (sv.getCurrentValue(), newStart);
expect (! sv.isSmoothing());
}
beginTest ("Sample rate");
{
SmoothedValueType svSamples { 3.0f };
auto svTime = svSamples;
auto numSamples = 12;
svSamples.reset (numSamples);
svTime.reset (numSamples * 2, 1.0);
for (int i = 0; i < numSamples; ++i)
{
svTime.skip (1);
expectWithinAbsoluteError (svSamples.getNextValue(),
svTime.getNextValue(),
1.0e-7f);
}
}
beginTest ("Block processing");
{
SmoothedValueType sv (1.0f);
sv.reset (12);
sv.setTargetValue (2.0f);
const auto numSamples = 15;
AudioBuffer<float> referenceData (1, numSamples);
for (int i = 0; i < numSamples; ++i)
referenceData.setSample (0, i, sv.getNextValue());
expect (referenceData.getSample (0, 0) > 0);
expect (referenceData.getSample (0, 10) < sv.getTargetValue());
expectWithinAbsoluteError (referenceData.getSample (0, 11),
sv.getTargetValue(),
2.0e-7f);
auto getUnitData = [] (int numSamplesToGenerate)
{
AudioBuffer<float> result (1, numSamplesToGenerate);
for (int i = 0; i < numSamplesToGenerate; ++i)
result.setSample (0, i, 1.0f);
return result;
};
auto compareData = [this] (const AudioBuffer<float>& test,
const AudioBuffer<float>& reference)
{
for (int i = 0; i < test.getNumSamples(); ++i)
expectWithinAbsoluteError (test.getSample (0, i),
reference.getSample (0, i),
2.0e-7f);
};
auto testData = getUnitData (numSamples);
sv.setCurrentAndTargetValue (1.0f);
sv.setTargetValue (2.0f);
sv.applyGain (testData.getWritePointer (0), numSamples);
compareData (testData, referenceData);
testData = getUnitData (numSamples);
AudioBuffer<float> destData (1, numSamples);
sv.setCurrentAndTargetValue (1.0f);
sv.setTargetValue (2.0f);
sv.applyGain (destData.getWritePointer (0),
testData.getReadPointer (0),
numSamples);
compareData (destData, referenceData);
compareData (testData, getUnitData (numSamples));
testData = getUnitData (numSamples);
sv.setCurrentAndTargetValue (1.0f);
sv.setTargetValue (2.0f);
sv.applyGain (testData, numSamples);
compareData (testData, referenceData);
}
beginTest ("Skip");
{
SmoothedValueType sv;
sv.reset (12);
sv.setCurrentAndTargetValue (1.0f);
sv.setTargetValue (2.0f);
Array<float> reference;
for (int i = 0; i < 15; ++i)
reference.add (sv.getNextValue());
sv.setCurrentAndTargetValue (1.0f);
sv.setTargetValue (2.0f);
expectWithinAbsoluteError (sv.skip (1), reference[0], 1.0e-6f);
expectWithinAbsoluteError (sv.skip (1), reference[1], 1.0e-6f);
expectWithinAbsoluteError (sv.skip (2), reference[3], 1.0e-6f);
sv.skip (3);
expectWithinAbsoluteError (sv.getCurrentValue(), reference[6], 1.0e-6f);
expectEquals (sv.skip (300), sv.getTargetValue());
expectEquals (sv.getCurrentValue(), sv.getTargetValue());
}
beginTest ("Negative");
{
SmoothedValueType sv;
auto numValues = 12;
sv.reset (numValues);
std::vector<std::pair<float, float>> ranges = { { -1.0f, -2.0f },
{ -100.0f, -3.0f } };
for (auto range : ranges)
{
auto start = range.first, end = range.second;
sv.setCurrentAndTargetValue (start);
sv.setTargetValue (end);
auto val = sv.skip (numValues / 2);
if (end > start)
expect (val > start && val < end);
else
expect (val < start && val > end);
auto nextVal = sv.getNextValue();
expect (end > start ? (nextVal > val) : (nextVal < val));
auto endVal = sv.skip (500);
expectEquals (endVal, end);
expectEquals (sv.getNextValue(), end);
expectEquals (sv.getCurrentValue(), end);
sv.setCurrentAndTargetValue (start);
sv.setTargetValue (end);
SmoothedValueType positiveSv { -start };
positiveSv.reset (numValues);
positiveSv.setTargetValue (-end);
for (int i = 0; i < numValues + 2; ++i)
expectEquals (sv.getNextValue(), -positiveSv.getNextValue());
}
}
}
};
#endif
} // namespace juce