Crossfader.h

/* CrossFader.h */
 
/* Copyright (C) 2011-2024 Michael Lugmair (Lucio Carreras)
 *
 * This file is part of sayonara player
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
/* CrossFader.h */
 
#ifndef SAYONARA_ENGINE_CROSSFADER_H
#define SAYONARA_ENGINE_CROSSFADER_H
 
#include "Utils/Pimpl.h"
#include "PipelineInterfaces.h"
#include <QThread>
 
#include <gst/gst.h>
 
namespace PipelineExtensions
{
    class Crossfader
    {
        public:
            enum class FadeMode :
                unsigned char
            {
                NoFading = 0,
                FadeIn,
                FadeOut
            };
 
            virtual ~Crossfader();
 
            virtual void fadeIn() = 0;
            virtual void fadeOut() = 0;
            virtual void abortFading() = 0;
            [[nodiscard]] virtual bool isFading() const = 0;
            [[nodiscard]] virtual FadeMode mode() const = 0;
 
            [[nodiscard]] static MilliSeconds fadingTimeMs();
    };
 
    std::shared_ptr<Crossfader>
    createCrossfader(PlaystateController* playStateController, GstElement* volume);
}
 
#endif // SAYONARA_ENGINE_CROSSFADER_H