125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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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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namespace
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{
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uint16 generateNoteID (int midiChannel, int midiNoteNumber) noexcept
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{
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jassert (midiChannel > 0 && midiChannel <= 16);
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jassert (midiNoteNumber >= 0 && midiNoteNumber < 128);
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return uint16 ((midiChannel << 7) + midiNoteNumber);
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}
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}
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//==============================================================================
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MPENote::MPENote (int midiChannel_,
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int initialNote_,
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MPEValue noteOnVelocity_,
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MPEValue pitchbend_,
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MPEValue pressure_,
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MPEValue timbre_,
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KeyState keyState_) noexcept
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: noteID (generateNoteID (midiChannel_, initialNote_)),
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midiChannel (uint8 (midiChannel_)),
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initialNote (uint8 (initialNote_)),
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noteOnVelocity (noteOnVelocity_),
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pitchbend (pitchbend_),
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pressure (pressure_),
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initialTimbre (timbre_),
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timbre (timbre_),
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keyState (keyState_)
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{
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jassert (keyState != MPENote::off);
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jassert (isValid());
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}
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MPENote::MPENote() noexcept {}
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//==============================================================================
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bool MPENote::isValid() const noexcept
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{
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return midiChannel > 0 && midiChannel <= 16 && initialNote < 128;
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}
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//==============================================================================
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double MPENote::getFrequencyInHertz (double frequencyOfA) const noexcept
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{
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auto pitchInSemitones = double (initialNote) + totalPitchbendInSemitones;
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return frequencyOfA * std::pow (2.0, (pitchInSemitones - 69.0) / 12.0);
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}
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//==============================================================================
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bool MPENote::operator== (const MPENote& other) const noexcept
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{
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jassert (isValid() && other.isValid());
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return noteID == other.noteID;
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}
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bool MPENote::operator!= (const MPENote& other) const noexcept
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{
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jassert (isValid() && other.isValid());
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return noteID != other.noteID;
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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 MPENoteTests : public UnitTest
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{
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public:
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MPENoteTests() : UnitTest ("MPENote class", "MIDI/MPE") {}
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//==============================================================================
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void runTest() override
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{
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beginTest ("getFrequencyInHertz");
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{
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MPENote note;
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note.initialNote = 60;
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note.totalPitchbendInSemitones = -0.5;
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expectEqualsWithinOneCent (note.getFrequencyInHertz(), 254.178);
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}
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}
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private:
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//==============================================================================
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void expectEqualsWithinOneCent (double frequencyInHertzActual,
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double frequencyInHertzExpected)
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{
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double ratio = frequencyInHertzActual / frequencyInHertzExpected;
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double oneCent = 1.0005946;
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expect (ratio < oneCent);
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expect (ratio > 1.0 / oneCent);
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}
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};
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static MPENoteTests MPENoteUnitTests;
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#endif // JUCE_UNIT_TESTS
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} // namespace juce
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