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#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,
mixxx::Bpm bpm,
mixxx::audio::FramePos firstBeatPositionOnFrameBoundary,
const QString& subVersion = QString());
static BeatsPointer fromByteArray(
audio::SampleRate sampleRate,
const QString& subVersion,
const QByteArray& byteArray);
// The following are all methods from the Beats interface, see method
// comments in beats.h
bool hasConstantTempo() const override {
return true;
}
QByteArray toByteArray() const override;
QString getVersion() const override;
QString getSubVersion() const override;
////////////////////////////////////////////////////////////////////////////
// Beat calculations
////////////////////////////////////////////////////////////////////////////
bool findPrevNextBeats(audio::FramePos position,
audio::FramePos* prevBeatPosition,
audio::FramePos* nextBeatPosition,
bool snapToNearBeats) const override;
audio::FramePos findNthBeat(audio::FramePos position, int n) const override;
std::unique_ptr<BeatIterator> findBeats(audio::FramePos startPosition,
audio::FramePos endPosition) const override;
bool hasBeatInRange(audio::FramePos startPosition, audio::FramePos endPosition) const override;
mixxx::Bpm getBpm() const override;
mixxx::Bpm getBpmAroundPosition(audio::FramePos position, int n) const override;
audio::SampleRate getSampleRate() const override {
return m_sampleRate;
}
////////////////////////////////////////////////////////////////////////////
// Beat mutations
////////////////////////////////////////////////////////////////////////////
BeatsPointer translate(audio::FrameDiff_t offset) const override;
BeatsPointer scale(BpmScale scale) const override;
BeatsPointer setBpm(mixxx::Bpm bpm) 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);
audio::FramePos firstBeatPosition() const;
mixxx::Bpm bpm() const;
bool isValid() const override;
// 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 audio::FrameDiff_t m_beatLengthFrames;
};
} // namespace mixxx
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