/*
    QMPlay2 is a video and audio player.
    Copyright (C) 2010-2019  Błażej Szczygieł

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once

#include <ModuleParams.hpp>
#include <VideoFrame.hpp>

#include <QQueue>

class QMPLAY2SHAREDLIB_EXPORT VideoFilter : public ModuleParams
{
public:
    class FrameBuffer
    {
    public:
        FrameBuffer() = default;
        inline FrameBuffer(const VideoFrame &frame, double ts) :
            frame(frame),
            ts(ts)
        {}

        VideoFrame frame;
        double ts = 0.0;
    };

    virtual ~VideoFilter() = default;

    virtual void clearBuffer();

    bool removeLastFromInternalBuffer();

    virtual bool filter(QQueue<FrameBuffer> &framesQueue) = 0;

protected:
    void addFramesToInternalQueue(QQueue<FrameBuffer> &framesQueue);

    inline double halfDelay(double f1_ts, double f2_ts) const
    {
        return (f1_ts - f2_ts) / 2.0;
    }

    QQueue<FrameBuffer> internalQueue;
};
