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juce_MPEValue.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
{
MPEValue::MPEValue() noexcept {}
MPEValue::MPEValue (int value) : normalisedValue (value) {}
//==============================================================================
MPEValue MPEValue::from7BitInt (int value) noexcept
{
jassert (value >= 0 && value <= 127);
auto valueAs14Bit = value <= 64 ? value << 7
: int (jmap<float> (float (value - 64), 0.0f, 63.0f, 0.0f, 8191.0f)) + 8192;
return { valueAs14Bit };
}
MPEValue MPEValue::from14BitInt (int value) noexcept
{
jassert (value >= 0 && value <= 16383);
return { value };
}
MPEValue MPEValue::fromUnsignedFloat (float value) noexcept
{
jassert (0.0f <= value && value <= 1.0f);
return { roundToInt (value * 16383.0f) };
}
MPEValue MPEValue::fromSignedFloat (float value) noexcept
{
jassert (-1.0f <= value && value <= 1.0f);
return { roundToInt (((value + 1.0f) * 16383.0f) / 2.0f) };
}
//==============================================================================
MPEValue MPEValue::minValue() noexcept { return MPEValue::from7BitInt (0); }
MPEValue MPEValue::centreValue() noexcept { return MPEValue::from7BitInt (64); }
MPEValue MPEValue::maxValue() noexcept { return MPEValue::from7BitInt (127); }
int MPEValue::as7BitInt() const noexcept
{
return normalisedValue >> 7;
}
int MPEValue::as14BitInt() const noexcept
{
return normalisedValue;
}
//==============================================================================
float MPEValue::asSignedFloat() const noexcept
{
return (normalisedValue < 8192)
? jmap<float> (float (normalisedValue), 0.0f, 8192.0f, -1.0f, 0.0f)
: jmap<float> (float (normalisedValue), 8192.0f, 16383.0f, 0.0f, 1.0f);
}
float MPEValue::asUnsignedFloat() const noexcept
{
return jmap<float> (float (normalisedValue), 0.0f, 16383.0f, 0.0f, 1.0f);
}
//==============================================================================
bool MPEValue::operator== (const MPEValue& other) const noexcept
{
return normalisedValue == other.normalisedValue;
}
bool MPEValue::operator!= (const MPEValue& other) const noexcept
{
return ! operator== (other);
}
//==============================================================================
//==============================================================================
#if JUCE_UNIT_TESTS
class MPEValueTests final : public UnitTest
{
public:
MPEValueTests()
: UnitTest ("MPEValue class", UnitTestCategories::midi)
{}
void runTest() override
{
beginTest ("comparison operator");
{
MPEValue value1 = MPEValue::from7BitInt (7);
MPEValue value2 = MPEValue::from7BitInt (7);
MPEValue value3 = MPEValue::from7BitInt (8);
expect (value1 == value1);
expect (value1 == value2);
expect (value1 != value3);
}
beginTest ("special values");
{
expectEquals (MPEValue::minValue().as7BitInt(), 0);
expectEquals (MPEValue::minValue().as14BitInt(), 0);
expectEquals (MPEValue::centreValue().as7BitInt(), 64);
expectEquals (MPEValue::centreValue().as14BitInt(), 8192);
expectEquals (MPEValue::maxValue().as7BitInt(), 127);
expectEquals (MPEValue::maxValue().as14BitInt(), 16383);
}
beginTest ("zero/minimum value");
{
expectValuesConsistent (MPEValue::from7BitInt (0), 0, 0, -1.0f, 0.0f);
expectValuesConsistent (MPEValue::from14BitInt (0), 0, 0, -1.0f, 0.0f);
expectValuesConsistent (MPEValue::fromUnsignedFloat (0.0f), 0, 0, -1.0f, 0.0f);
expectValuesConsistent (MPEValue::fromSignedFloat (-1.0f), 0, 0, -1.0f, 0.0f);
}
beginTest ("maximum value");
{
expectValuesConsistent (MPEValue::from7BitInt (127), 127, 16383, 1.0f, 1.0f);
expectValuesConsistent (MPEValue::from14BitInt (16383), 127, 16383, 1.0f, 1.0f);
expectValuesConsistent (MPEValue::fromUnsignedFloat (1.0f), 127, 16383, 1.0f, 1.0f);
expectValuesConsistent (MPEValue::fromSignedFloat (1.0f), 127, 16383, 1.0f, 1.0f);
}
beginTest ("centre value");
{
expectValuesConsistent (MPEValue::from7BitInt (64), 64, 8192, 0.0f, 0.5f);
expectValuesConsistent (MPEValue::from14BitInt (8192), 64, 8192, 0.0f, 0.5f);
expectValuesConsistent (MPEValue::fromUnsignedFloat (0.5f), 64, 8192, 0.0f, 0.5f);
expectValuesConsistent (MPEValue::fromSignedFloat (0.0f), 64, 8192, 0.0f, 0.5f);
}
beginTest ("value halfway between min and centre");
{
expectValuesConsistent (MPEValue::from7BitInt (32), 32, 4096, -0.5f, 0.25f);
expectValuesConsistent (MPEValue::from14BitInt (4096), 32, 4096, -0.5f, 0.25f);
expectValuesConsistent (MPEValue::fromUnsignedFloat (0.25f), 32, 4096, -0.5f, 0.25f);
expectValuesConsistent (MPEValue::fromSignedFloat (-0.5f), 32, 4096, -0.5f, 0.25f);
}
}
private:
//==============================================================================
void expectValuesConsistent (MPEValue value,
int expectedValueAs7BitInt,
int expectedValueAs14BitInt,
float expectedValueAsSignedFloat,
float expectedValueAsUnsignedFloat)
{
expectEquals (value.as7BitInt(), expectedValueAs7BitInt);
expectEquals (value.as14BitInt(), expectedValueAs14BitInt);
expectFloatWithinRelativeError (value.asSignedFloat(), expectedValueAsSignedFloat, 0.0001f);
expectFloatWithinRelativeError (value.asUnsignedFloat(), expectedValueAsUnsignedFloat, 0.0001f);
}
//==============================================================================
void expectFloatWithinRelativeError (float actualValue, float expectedValue, float maxRelativeError)
{
const float maxAbsoluteError = jmax (1.0f, std::abs (expectedValue)) * maxRelativeError;
expect (std::abs (expectedValue - actualValue) < maxAbsoluteError);
}
};
static MPEValueTests MPEValueUnitTests;
#endif
} // namespace juce
juce::MPEValue::asSignedFloat
float asSignedFloat() const noexcept
Definition juce_MPEValue.cpp:74
juce::MPEValue::maxValue
static MPEValue maxValue() noexcept
Definition juce_MPEValue.cpp:61
juce::MPEValue::centreValue
static MPEValue centreValue() noexcept
Definition juce_MPEValue.cpp:60
juce::MPEValue::from14BitInt
static MPEValue from14BitInt(int value) noexcept
Definition juce_MPEValue.cpp:40
juce::MPEValue::operator==
bool operator==(const MPEValue &other) const noexcept
Definition juce_MPEValue.cpp:87
juce::MPEValue::fromUnsignedFloat
static MPEValue fromUnsignedFloat(float value) noexcept
Definition juce_MPEValue.cpp:46
juce::MPEValue::fromSignedFloat
static MPEValue fromSignedFloat(float value) noexcept
Definition juce_MPEValue.cpp:52
juce::MPEValue::minValue
static MPEValue minValue() noexcept
Definition juce_MPEValue.cpp:59
juce::MPEValue::asUnsignedFloat
float asUnsignedFloat() const noexcept
Definition juce_MPEValue.cpp:81
juce::MPEValue::MPEValue
MPEValue() noexcept
Definition juce_MPEValue.cpp:26
juce::MPEValue::as7BitInt
int as7BitInt() const noexcept
Definition juce_MPEValue.cpp:63
juce::MPEValue::as14BitInt
int as14BitInt() const noexcept
Definition juce_MPEValue.cpp:68
juce::MPEValue::from7BitInt
static MPEValue from7BitInt(int value) noexcept
Definition juce_MPEValue.cpp:30
juce::MPEValue::operator!=
bool operator!=(const MPEValue &other) const noexcept
Definition juce_MPEValue.cpp:92
juce::UnitTest
Definition juce_UnitTest.h:70