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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
#include <gtest/gtest.h>
#include <QtDebug>
#include "track/beatgrid.h"
#include "util/memory.h"
using namespace mixxx;
namespace {
const double kMaxBeatError = 1e-9;
TrackPointer newTrack(int sampleRate) {
TrackPointer pTrack(Track::newTemporary());
pTrack->setAudioProperties(
mixxx::audio::ChannelCount(2),
mixxx::audio::SampleRate(sampleRate),
mixxx::audio::Bitrate(),
mixxx::Duration::fromSeconds(180));
return pTrack;
}
TEST(BeatGridTest, Scale) {
int sampleRate = 44100;
TrackPointer pTrack = newTrack(sampleRate);
double bpm = 60.0;
pTrack->setBpm(bpm);
auto pGrid = std::make_unique<BeatGrid>(*pTrack, 0);
pGrid->setBpm(bpm);
EXPECT_DOUBLE_EQ(bpm, pGrid->getBpm());
pGrid->scale(Beats::DOUBLE);
EXPECT_DOUBLE_EQ(2 * bpm, pGrid->getBpm());
pGrid->scale(Beats::HALVE);
EXPECT_DOUBLE_EQ(bpm, pGrid->getBpm());
pGrid->scale(Beats::TWOTHIRDS);
EXPECT_DOUBLE_EQ(bpm * 2 / 3, pGrid->getBpm());
pGrid->scale(Beats::THREEHALVES);
EXPECT_DOUBLE_EQ(bpm, pGrid->getBpm());
pGrid->scale(Beats::THREEFOURTHS);
EXPECT_DOUBLE_EQ(bpm * 3 / 4, pGrid->getBpm());
pGrid->scale(Beats::FOURTHIRDS);
EXPECT_DOUBLE_EQ(bpm, pGrid->getBpm());
}
TEST(BeatGridTest, TestNthBeatWhenOnBeat) {
int sampleRate = 44100;
TrackPointer pTrack = newTrack(sampleRate);
double bpm = 60.1;
const int kFrameSize = 2;
pTrack->setBpm(bpm);
double beatLength = (60.0 * sampleRate / bpm) * kFrameSize;
auto pGrid = std::make_unique<BeatGrid>(*pTrack, 0);
pGrid->setBpm(bpm);
// Pretend we're on the 20th beat;
double position = beatLength * 20;
// The spec dictates that a value of 0 is always invalid and returns -1
EXPECT_EQ(-1, pGrid->findNthBeat(position, 0));
// findNthBeat should return exactly the current beat if we ask for 1 or
// -1. For all other values, it should return n times the beat length.
for (int i = 1; i < 20; ++i) {
EXPECT_NEAR(position + beatLength * (i - 1), pGrid->findNthBeat(position, i), kMaxBeatError);
EXPECT_NEAR(position + beatLength * (-i + 1), pGrid->findNthBeat(position, -i), kMaxBeatError);
}
// Also test prev/next beat calculation.
double prevBeat, nextBeat;
pGrid->findPrevNextBeats(position, &prevBeat, &nextBeat);
EXPECT_NEAR(position, prevBeat, kMaxBeatError);
EXPECT_NEAR(position + beatLength, nextBeat, kMaxBeatError);
// Both previous and next beat should return the current position.
EXPECT_NEAR(position, pGrid->findNextBeat(position), kMaxBeatError);
EXPECT_NEAR(position, pGrid->findPrevBeat(position), kMaxBeatError);
}
TEST(BeatGridTest, TestNthBeatWhenOnBeat_BeforeEpsilon) {
int sampleRate = 44100;
TrackPointer pTrack = newTrack(sampleRate);
double bpm = 60.1;
const int kFrameSize = 2;
pTrack->setBpm(bpm);
double beatLength = (60.0 * sampleRate / bpm) * kFrameSize;
auto pGrid = std::make_unique<BeatGrid>(*pTrack, 0);
pGrid->setBpm(bpm);
// Pretend we're just before the 20th beat.
const double kClosestBeat = 20 * beatLength;
double position = kClosestBeat - beatLength * 0.005;
// The spec dictates that a value of 0 is always invalid and returns -1
EXPECT_EQ(-1, pGrid->findNthBeat(position, 0));
// findNthBeat should return exactly the current beat if we ask for 1 or
// -1. For all other values, it should return n times the beat length.
for (int i = 1; i < 20; ++i) {
EXPECT_NEAR(kClosestBeat + beatLength * (i - 1), pGrid->findNthBeat(position, i), kMaxBeatError);
EXPECT_NEAR(kClosestBeat + beatLength * (-i + 1), pGrid->findNthBeat(position, -i), kMaxBeatError);
}
// Also test prev/next beat calculation.
double prevBeat, nextBeat;
pGrid->findPrevNextBeats(position, &prevBeat, &nextBeat);
EXPECT_NEAR(kClosestBeat, prevBeat, kMaxBeatError);
EXPECT_NEAR(kClosestBeat + beatLength, nextBeat, kMaxBeatError);
// Both previous and next beat should return the closest beat.
EXPECT_NEAR(kClosestBeat, pGrid->findNextBeat(position), kMaxBeatError);
EXPECT_NEAR(kClosestBeat, pGrid->findPrevBeat(position), kMaxBeatError);
}
TEST(BeatGridTest, TestNthBeatWhenOnBeat_AfterEpsilon) {
int sampleRate = 44100;
TrackPointer pTrack = newTrack(sampleRate);
double bpm = 60.1;
const int kFrameSize = 2;
pTrack->setBpm(bpm);
double beatLength = (60.0 * sampleRate / bpm) * kFrameSize;
auto pGrid = std::make_unique<BeatGrid>(*pTrack, 0);
pGrid->setBpm(bpm);
// Pretend we're just before the 20th beat.
const double kClosestBeat = 20 * beatLength;
double position = kClosestBeat + beatLength * 0.005;
// The spec dictates that a value of 0 is always invalid and returns -1
EXPECT_EQ(-1, pGrid->findNthBeat(position, 0));
// findNthBeat should return exactly the current beat if we ask for 1 or
// -1. For all other values, it should return n times the beat length.
for (int i = 1; i < 20; ++i) {
EXPECT_NEAR(kClosestBeat + beatLength * (i - 1), pGrid->findNthBeat(position, i), kMaxBeatError);
EXPECT_NEAR(kClosestBeat + beatLength * (-i + 1), pGrid->findNthBeat(position, -i), kMaxBeatError);
}
// Also test prev/next beat calculation.
double prevBeat, nextBeat;
pGrid->findPrevNextBeats(position, &prevBeat, &nextBeat);
EXPECT_NEAR(kClosestBeat, prevBeat, kMaxBeatError);
EXPECT_NEAR(kClosestBeat + beatLength, nextBeat, kMaxBeatError);
// Both previous and next beat should return the closest beat.
EXPECT_NEAR(kClosestBeat, pGrid->findNextBeat(position), kMaxBeatError);
EXPECT_NEAR(kClosestBeat, pGrid->findPrevBeat(position), kMaxBeatError);
}
TEST(BeatGridTest, TestNthBeatWhenNotOnBeat) {
int sampleRate = 44100;
TrackPointer pTrack = newTrack(sampleRate);
double bpm = 60.1;
const int kFrameSize = 2;
pTrack->setBpm(bpm);
double beatLength = (60.0 * sampleRate / bpm) * kFrameSize;
auto pGrid = std::make_unique<BeatGrid>(*pTrack, 0);
pGrid->setBpm(bpm);
// Pretend we're half way between the 20th and 21st beat
double previousBeat = beatLength * 20.0;
double nextBeat = beatLength * 21.0;
double position = (nextBeat + previousBeat) / 2.0;
// The spec dictates that a value of 0 is always invalid and returns -1
EXPECT_EQ(-1, pGrid->findNthBeat(position, 0));
// findNthBeat should return multiples of beats starting from the next or
// previous beat, depending on whether N is positive or negative.
for (int i = 1; i < 20; ++i) {
EXPECT_NEAR(nextBeat + beatLength*(i-1), pGrid->findNthBeat(position, i), kMaxBeatError);
EXPECT_NEAR(previousBeat + beatLength*(-i+1), pGrid->findNthBeat(position, -i), kMaxBeatError);
}
// Also test prev/next beat calculation
double foundPrevBeat, foundNextBeat;
pGrid->findPrevNextBeats(position, &foundPrevBeat, &foundNextBeat);
EXPECT_NEAR(previousBeat, foundPrevBeat, kMaxBeatError);
EXPECT_NEAR(nextBeat, foundNextBeat, kMaxBeatError);
}
} // namespace
|
