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
|
#pragma once
#include "proto/beats.pb.h"
#include "track/beats.h"
#define BEAT_GRID_1_VERSION "BeatGrid-1.0"
#define BEAT_GRID_2_VERSION "BeatGrid-2.0"
class Track;
namespace mixxx {
// BeatGrid is an implementation of the Beats interface that implements an
// infinite grid of beats, aligned to a song simply by a starting offset of the
// first beat and the song's average beats-per-minute.
class BeatGrid final : public Beats {
public:
~BeatGrid() override = default;
static BeatsPointer makeBeatGrid(
audio::SampleRate sampleRate,
const QString& subVersion,
double dBpm,
double dFirstBeatSample);
static BeatsPointer makeBeatGrid(
audio::SampleRate sampleRate,
const QString& subVersion,
const QByteArray& byteArray);
// The following are all methods from the Beats interface, see method
// comments in beats.h
Beats::CapabilitiesFlags getCapabilities() const override {
return BEATSCAP_TRANSLATE | BEATSCAP_SCALE | BEATSCAP_SETBPM;
}
QByteArray toByteArray() const override;
QString getVersion() const override;
QString getSubVersion() const override;
////////////////////////////////////////////////////////////////////////////
// Beat calculations
////////////////////////////////////////////////////////////////////////////
double findNextBeat(double dSamples) const override;
double findPrevBeat(double dSamples) const override;
bool findPrevNextBeats(double dSamples,
double* dpPrevBeatSamples,
double* dpNextBeatSamples) const override;
double findClosestBeat(double dSamples) const override;
double findNthBeat(double dSamples, int n) const override;
std::unique_ptr<BeatIterator> findBeats(double startSample, double stopSample) const override;
bool hasBeatInRange(double startSample, double stopSample) const override;
double getBpm() const override;
double getBpmAroundPosition(double curSample, int n) const override;
audio::SampleRate getSampleRate() const override {
return m_sampleRate;
}
////////////////////////////////////////////////////////////////////////////
// Beat mutations
////////////////////////////////////////////////////////////////////////////
BeatsPointer translate(double dNumSamples) const override;
BeatsPointer scale(enum BPMScale scale) const override;
BeatsPointer setBpm(double dBpm) override;
private:
BeatGrid(
audio::SampleRate sampleRate,
const QString& subVersion,
const mixxx::track::io::BeatGrid& grid,
double beatLength);
// Constructor to update the beat grid
BeatGrid(const BeatGrid& other, const mixxx::track::io::BeatGrid& grid, double beatLength);
BeatGrid(const BeatGrid& other);
double firstBeatSample() const;
double bpm() const;
// For internal use only.
bool isValid() const;
// The sub-version of this beatgrid.
const QString m_subVersion;
// The number of samples per second
const audio::SampleRate m_sampleRate;
// Data storage for BeatGrid
const mixxx::track::io::BeatGrid m_grid;
// The length of a beat in samples
const double m_dBeatLength;
};
} // namespace mixxx
|
