videosource.h

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/*
    Copyright © 2014-2019 by The qTox Project Contributors
 
    This file is part of qTox, a Qt-based graphical interface for Tox.
 
    qTox is libre 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.
 
    qTox 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 qTox.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#include <QObject>
 
#include <atomic>
#include <memory>
 
class VideoFrame;
 
class VideoSource : public QObject
{
    Q_OBJECT
 
public:
    // Declare type aliases
    using IDType = std::uint_fast64_t;
    using AtomicIDType = std::atomic_uint_fast64_t;
 
public:
    VideoSource()
        : id(sourceIDs++)
    {
    }
 
    virtual ~VideoSource() = default;
    virtual void subscribe() = 0;
    virtual void unsubscribe() = 0;
 
    const IDType id;
signals:
    void frameAvailable(std::shared_ptr<VideoFrame> frame);
    void sourceStopped();
 
private:
    // Used to manage a global ID for all VideoSources
    static AtomicIDType sourceIDs;
};