volumehandler.h

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/***************************************************************************
 *   Copyright (C) 2008-2024 by Ilya Kotov                                 *
 *   forkotov02@ya.ru                                                      *
 *                                                                         *
 *   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; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
 ***************************************************************************/
 
#ifndef VOLUMEHANDLER_H
#define VOLUMEHANDLER_H

#include <QMutex>
#include <atomic>
#include "volume.h"
#include "buffer.h"

class QTimer;
class SoftwareVolume;

class QMMP_EXPORT VolumeHandler : public QObject
{
    Q_OBJECT
public:
    explicit VolumeHandler(QObject *parent = nullptr);
    ~VolumeHandler();

    void setVolume(int left, int right);
    void changeVolume(int delta);
    void setVolume(int volume);
    void setBalance(int balance);
    void setMuted(bool muted);
    int left() const;
    int right() const;
    int volume() const;
    int balance() const;
    bool isMuted() const;
    void apply(Buffer *b, int chan);
    static VolumeHandler *instance();

signals:
    void volumeChanged(int volume);
    void balanceChanged(int balance);
    void mutedChanged(bool muted);

public slots:
    void checkVolume();
    void reload();

private:
    VolumeSettings m_settings;
    bool m_prev_block = false;
    std::atomic_bool m_muted = ATOMIC_VAR_INIT(false);
    std::atomic_bool m_apply = ATOMIC_VAR_INIT(false);
    QMutex m_mutex;
    double m_scaleLeft = 0, m_scaleRight = 0;
    Volume *m_volume = nullptr;
    QTimer *m_timer = nullptr;
    static VolumeHandler *m_instance;

};

#endif