OpenShot Audio Library | OpenShotAudio  0.3.3
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 
23 namespace juce
24 {
25 
26 namespace
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 
59 MPENote::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 
92 class MPENoteTests : public UnitTest
93 {
94 public:
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 
111 private:
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 
123 static MPENoteTests MPENoteUnitTests;
124 
125 #endif
126 
127 } // namespace juce
double getFrequencyInHertz(double frequencyOfA=440.0) const noexcept
MPENote() noexcept
bool operator!=(const MPENote &other) const noexcept
bool isValid() const noexcept
bool operator==(const MPENote &other) const noexcept