plugin: add BeatTracker

Replaces beat-detector.cpp

1 files changed, 47 insertions, 0 deletions

diff --git a/plugin/src/Caelestia/beattracker.hpp b/plugin/src/Caelestia/beattracker.hpp
new file mode 100644
index 0000000..a300c20
--- /dev/null
+++ b/plugin/src/Caelestia/beattracker.hpp
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <QAudioSource>
+#include <QIODevice>
+#include <QObject>
+#include <aubio/aubio.h>
+#include <qqmlintegration.h>
+
+class BeatTracker : public QObject {
+    Q_OBJECT
+    QML_ELEMENT
+    QML_SINGLETON
+
+    Q_PROPERTY(smpl_t bpm READ bpm NOTIFY bpmChanged)
+    Q_PROPERTY(int refCount READ refCount WRITE setRefCount NOTIFY refCountChanged)
+
+public:
+    explicit BeatTracker(uint_t sampleRate = 44100, uint_t hopSize = 512, QObject* parent = nullptr);
+    ~BeatTracker();
+
+    [[nodiscard]] smpl_t bpm() const;
+
+    [[nodiscard]] int refCount() const;
+    void setRefCount(int refCount);
+
+signals:
+    void bpmChanged();
+    void refCountChanged();
+    void beat(smpl_t bpm);
+
+private:
+    QAudioSource* m_source;
+    QIODevice* m_device;
+
+    aubio_tempo_t* m_tempo;
+    fvec_t* m_in;
+    fvec_t* m_out;
+    uint_t m_hopSize;
+
+    smpl_t m_bpm;
+    int m_refCount;
+
+    void start();
+    void stop();
+    void process();
+    void handleStateChanged(QtAudio::State state) const;
+};