TapTempo.h

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/*
 * TapTempo.h - Plugin to count beats per minute
 *
 * Copyright (c) 2026 saker <sakertooth@gmail.com>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */
 
#ifndef LMMS_TAP_TEMPO_H
#define LMMS_TAP_TEMPO_H
 
#include <array>
#include <chrono>
 
#include "TapTempoView.h"
#include "ToolPlugin.h"
 
namespace lmms {
 
class TapTempo : public ToolPlugin
{
    Q_OBJECT
public:
    TapTempo();
    void tap(bool play);
    void sync();
    void reset();
    double bpm() const;
 
    QString nodeName() const override;
    void saveSettings(QDomDocument&, QDomElement&) override {}
    void loadSettings(const QDomElement&) override {}
 
    gui::PluginView* instantiateView(QWidget*) override { return new gui::TapTempoView(this); }
 
private:
    static constexpr auto MaxIntervals = 3;
    using clock = std::chrono::steady_clock;
    std::chrono::time_point<clock> m_lastTap;
    std::array<std::chrono::milliseconds, MaxIntervals> m_intervals;
    int m_beat = 0;
    int m_taps = 0;
    double m_bpm = 0;
};
} // namespace lmms
 
#endif // LMMS_TAP_TEMPO_H