CameraCapture.h

#ifndef CAMERACAPTURE_H
#define CAMERACAPTURE_H
 
#include <QImage>
#include <QObject>
#include <QtClassHelperMacros>
#include <atomic>
 
class CameraDisplayWidget;
class QThread;
class QMutex;
 
namespace cv {
class VideoCapture;
}
 
class CameraCapture : public QObject {
    Q_OBJECT
public:
    enum class Error {
        CAMERA_UNEXISTED,       
        CAMERA_UNOPENED,        
        CAMERA_UNBIND_DISPLAY,  
        CAMERA_MULTI_OPENED     
    };
 
    CameraCapture() = delete;
 
    Q_DISABLE_COPY(CameraCapture);
 
    explicit CameraCapture(const int index, QObject* parent = nullptr);
 
    ~CameraCapture();
 
    inline void bind_display_widget(CameraDisplayWidget* widget) {
        this->widget = widget;
    }
 
    inline void set_capture_delay_time(const int gap_time) {
        this->msleep_time = gap_time;
    }
 
    bool isActivate() const;
 
    bool start();
 
    bool close();
 
signals:
    void cameraOpened(int index);
 
    void cameraClosed(int index);
 
    void errorOccur(CameraCapture::Error e);
 
private:
    cv::VideoCapture* videoCaptureHandle { nullptr }; 
    int current_index { -1 }; 
 
    CameraDisplayWidget* widget { nullptr }; 
 
    QMutex* capMutex; 
    std::atomic_bool internal_running_state_holder { false }; 
    int msleep_time { 10 }; 
 
    void capture_internal();
};
 
#endif // CAMERACAPTURE_H