OpenShot Audio Library | OpenShotAudio: juce_MPENote.cpp Source File

OpenShot Audio Library | OpenShotAudio 0.3.2

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juce_MPENote.cpp
1/*
2 ==============================================================================
3
4 This file is part of the JUCE library.
5 Copyright (c) 2017 - ROLI Ltd.
6
7 JUCE is an open source library subject to commercial or open-source
8 licensing.
9
10 The code included in this file is provided under the terms of the ISC license
11 http://www.isc.org/downloads/software-support-policy/isc-license. Permission
12 To use, copy, modify, and/or distribute this software for any purpose with or
13 without fee is hereby granted provided that the above copyright notice and
14 this permission notice appear in all copies.
15
16 JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
17 EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
18 DISCLAIMED.
19
20 ==============================================================================
21*/
22
23namespace juce
24{
25
26namespace
27{
28 uint16 generateNoteID (int midiChannel, int midiNoteNumber) noexcept
29 {
30 jassert (midiChannel > 0 && midiChannel <= 16);
31 jassert (midiNoteNumber >= 0 && midiNoteNumber < 128);
32
33 return uint16 ((midiChannel << 7) + midiNoteNumber);
34 }
35}
36
37//==============================================================================
38 MPENote::MPENote (int midiChannel_,
39 int initialNote_,
40 MPEValue noteOnVelocity_,
41 MPEValue pitchbend_,
42 MPEValue pressure_,
43 MPEValue timbre_,
44 KeyState keyState_) noexcept
45 : noteID (generateNoteID (midiChannel_, initialNote_)),
46 midiChannel (uint8 (midiChannel_)),
47 initialNote (uint8 (initialNote_)),
48 noteOnVelocity (noteOnVelocity_),
49 pitchbend (pitchbend_),
50 pressure (pressure_),
51 initialTimbre (timbre_),
52 timbre (timbre_),
53 keyState (keyState_)
54{
55 jassert (keyState != MPENote::off);
56 jassert (isValid());
57}
58
59MPENote::MPENote() noexcept {}
60
61//==============================================================================
62 bool MPENote::isValid() const noexcept
63{
64 return midiChannel > 0 && midiChannel <= 16 && initialNote < 128;
65}
66
67//==============================================================================
68 double MPENote::getFrequencyInHertz (double frequencyOfA) const noexcept
69{
70 auto pitchInSemitones = double (initialNote) + totalPitchbendInSemitones;
71 return frequencyOfA * std::pow (2.0, (pitchInSemitones - 69.0) / 12.0);
72}
73
74//==============================================================================
75 bool MPENote::operator== (const MPENote& other) const noexcept
76{
77 jassert (isValid() && other.isValid());
78 return noteID == other.noteID;
79}
80
81 bool MPENote::operator!= (const MPENote& other) const noexcept
82{
83 jassert (isValid() && other.isValid());
84 return noteID != other.noteID;
85}
86
87
88//==============================================================================
89//==============================================================================
90#if JUCE_UNIT_TESTS
91
92class MPENoteTests : public UnitTest
93{
94public:
95 MPENoteTests()
96 : UnitTest ("MPENote class", UnitTestCategories::midi)
97 {}
98
99 //==============================================================================
100 void runTest() override
101 {
102 beginTest ("getFrequencyInHertz");
103 {
104 MPENote note;
105 note.initialNote = 60;
106 note.totalPitchbendInSemitones = -0.5;
107 expectEqualsWithinOneCent (note.getFrequencyInHertz(), 254.178);
108 }
109 }
110
111private:
112 //==============================================================================
113 void expectEqualsWithinOneCent (double frequencyInHertzActual,
114 double frequencyInHertzExpected)
115 {
116 double ratio = frequencyInHertzActual / frequencyInHertzExpected;
117 double oneCent = 1.0005946;
118 expect (ratio < oneCent);
119 expect (ratio > 1.0 / oneCent);
120 }
121};
122
123static MPENoteTests MPENoteUnitTests;
124
125#endif
126
127} // namespace juce
juce::MPEValue
Definition: juce_MPEValue.h:37
juce::UnitTest
Definition: juce_UnitTest.h:70
juce::MPENote
Definition: juce_MPENote.h:40
juce::MPENote::KeyState
KeyState
Definition: juce_MPENote.h:44
juce::MPENote::off
@ off
Definition: juce_MPENote.h:45
juce::MPENote::initialNote
uint8 initialNote
Definition: juce_MPENote.h:108
juce::MPENote::getFrequencyInHertz
double getFrequencyInHertz(double frequencyOfA=440.0) const noexcept
Definition: juce_MPENote.cpp:68
juce::MPENote::MPENote
MPENote() noexcept
Definition: juce_MPENote.cpp:59
juce::MPENote::operator!=
bool operator!=(const MPENote &other) const noexcept
Definition: juce_MPENote.cpp:81
juce::MPENote::midiChannel
uint8 midiChannel
Definition: juce_MPENote.h:103
juce::MPENote::isValid
bool isValid() const noexcept
Definition: juce_MPENote.cpp:62
juce::MPENote::operator==
bool operator==(const MPENote &other) const noexcept
Definition: juce_MPENote.cpp:75