camerasource.h

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/*
    Copyright © 2015-2019 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 "src/video/videomode.h"
#include "src/video/videosource.h"
#include <QFuture>
#include <QHash>
#include <QReadWriteLock>
#include <QString>
#include <QVector>
#include <atomic>
 
class CameraDevice;
struct AVCodecContext;
 
class CameraSource : public VideoSource
{
    Q_OBJECT
 
public:
    static CameraSource& getInstance();
    static void destroyInstance();
    void setupDefault();
    bool isNone() const;
 
    // VideoSource interface
    void subscribe() override;
    void unsubscribe() override;
 
public slots:
    void setupDevice(const QString& deviceName, const VideoMode& mode);
 
signals:
    void deviceOpened();
    void openFailed();
 
private:
    CameraSource();
    ~CameraSource();
    void stream();
 
private slots:
    void openDevice();
    void closeDevice();
 
private:
    QFuture<void> streamFuture;
    QThread* deviceThread;
 
    QString deviceName;
    CameraDevice* device;
    VideoMode mode;
    AVCodecContext* cctx;
    // TODO: Remove when ffmpeg version will be bumped to the 3.1.0
    AVCodecContext* cctxOrig;
    int videoStreamIndex;
 
    QReadWriteLock deviceMutex;
    QReadWriteLock streamMutex;
 
    std::atomic_bool _isNone;
    std::atomic_int subscriptions;
 
    static CameraSource* instance;
};