1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2017 - ROLI Ltd.
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::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 : public UnitTest
{
public:
MPEValueTests() : UnitTest ("MPEValue class", "MIDI/MPE") {}
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);
}
beginTest ("maximum value");
{
expectValuesConsistent (MPEValue::from7BitInt (127), 127, 16383, 1.0f, 1.0f);
expectValuesConsistent (MPEValue::from14BitInt (16383), 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);
}
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);
}
}
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 // JUCE_UNIT_TESTS
} // namespace juce
|
