174 lines
6.2 KiB
C++
174 lines
6.2 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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MPEValue::MPEValue() noexcept {}
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MPEValue::MPEValue (int value) : normalisedValue (value) {}
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//==============================================================================
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MPEValue MPEValue::from7BitInt (int value) noexcept
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{
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jassert (value >= 0 && value <= 127);
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auto valueAs14Bit = value <= 64 ? value << 7
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: int (jmap<float> (float (value - 64), 0.0f, 63.0f, 0.0f, 8191.0f)) + 8192;
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return { valueAs14Bit };
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}
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MPEValue MPEValue::from14BitInt (int value) noexcept
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{
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jassert (value >= 0 && value <= 16383);
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return { value };
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}
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//==============================================================================
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MPEValue MPEValue::minValue() noexcept { return MPEValue::from7BitInt (0); }
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MPEValue MPEValue::centreValue() noexcept { return MPEValue::from7BitInt (64); }
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MPEValue MPEValue::maxValue() noexcept { return MPEValue::from7BitInt (127); }
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int MPEValue::as7BitInt() const noexcept
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{
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return normalisedValue >> 7;
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}
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int MPEValue::as14BitInt() const noexcept
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{
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return normalisedValue;
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}
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//==============================================================================
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float MPEValue::asSignedFloat() const noexcept
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{
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return (normalisedValue < 8192)
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? jmap<float> (float (normalisedValue), 0.0f, 8192.0f, -1.0f, 0.0f)
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: jmap<float> (float (normalisedValue), 8192.0f, 16383.0f, 0.0f, 1.0f);
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}
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float MPEValue::asUnsignedFloat() const noexcept
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{
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return jmap<float> (float (normalisedValue), 0.0f, 16383.0f, 0.0f, 1.0f);
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}
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//==============================================================================
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bool MPEValue::operator== (const MPEValue& other) const noexcept
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{
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return normalisedValue == other.normalisedValue;
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}
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bool MPEValue::operator!= (const MPEValue& other) const noexcept
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{
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return ! operator== (other);
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}
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//==============================================================================
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//==============================================================================
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#if JUCE_UNIT_TESTS
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class MPEValueTests : public UnitTest
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{
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public:
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MPEValueTests()
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: UnitTest ("MPEValue class", UnitTestCategories::midi)
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{}
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void runTest() override
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{
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beginTest ("comparison operator");
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{
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MPEValue value1 = MPEValue::from7BitInt (7);
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MPEValue value2 = MPEValue::from7BitInt (7);
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MPEValue value3 = MPEValue::from7BitInt (8);
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expect (value1 == value1);
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expect (value1 == value2);
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expect (value1 != value3);
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}
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beginTest ("special values");
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{
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expectEquals (MPEValue::minValue().as7BitInt(), 0);
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expectEquals (MPEValue::minValue().as14BitInt(), 0);
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expectEquals (MPEValue::centreValue().as7BitInt(), 64);
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expectEquals (MPEValue::centreValue().as14BitInt(), 8192);
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expectEquals (MPEValue::maxValue().as7BitInt(), 127);
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expectEquals (MPEValue::maxValue().as14BitInt(), 16383);
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}
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beginTest ("zero/minimum value");
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{
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expectValuesConsistent (MPEValue::from7BitInt (0), 0, 0, -1.0f, 0.0f);
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expectValuesConsistent (MPEValue::from14BitInt (0), 0, 0, -1.0f, 0.0f);
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}
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beginTest ("maximum value");
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{
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expectValuesConsistent (MPEValue::from7BitInt (127), 127, 16383, 1.0f, 1.0f);
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expectValuesConsistent (MPEValue::from14BitInt (16383), 127, 16383, 1.0f, 1.0f);
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}
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beginTest ("centre value");
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{
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expectValuesConsistent (MPEValue::from7BitInt (64), 64, 8192, 0.0f, 0.5f);
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expectValuesConsistent (MPEValue::from14BitInt (8192), 64, 8192, 0.0f, 0.5f);
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}
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beginTest ("value halfway between min and centre");
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{
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expectValuesConsistent (MPEValue::from7BitInt (32), 32, 4096, -0.5f, 0.25f);
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expectValuesConsistent (MPEValue::from14BitInt (4096), 32, 4096, -0.5f, 0.25f);
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}
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}
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private:
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//==============================================================================
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void expectValuesConsistent (MPEValue value,
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int expectedValueAs7BitInt,
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int expectedValueAs14BitInt,
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float expectedValueAsSignedFloat,
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float expectedValueAsUnsignedFloat)
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{
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expectEquals (value.as7BitInt(), expectedValueAs7BitInt);
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expectEquals (value.as14BitInt(), expectedValueAs14BitInt);
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expectFloatWithinRelativeError (value.asSignedFloat(), expectedValueAsSignedFloat, 0.0001f);
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expectFloatWithinRelativeError (value.asUnsignedFloat(), expectedValueAsUnsignedFloat, 0.0001f);
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}
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//==============================================================================
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void expectFloatWithinRelativeError (float actualValue, float expectedValue, float maxRelativeError)
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{
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const float maxAbsoluteError = jmax (1.0f, std::abs (expectedValue)) * maxRelativeError;
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expect (std::abs (expectedValue - actualValue) < maxAbsoluteError);
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}
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};
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static MPEValueTests MPEValueUnitTests;
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#endif
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} // namespace juce
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