main.cpp

#include <iostream>
#include <QCamera>
#include <QCameraInfo>
#include <QApplication>
#include <QQmlComponent>
#include <QQmlProperty>
#include <QQuickWindow>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include "facefilter.h"

int main(int argc, char** argv) {

    QApplication app(argc, argv);

    qmlRegisterType<FaceFilter>("FaceFilter.uri", 1, 0, "FaceFilter");

    QQmlApplicationEngine engine;

    auto desired_camera = 1;

    auto available_cameras = QCameraInfo::availableCameras();
    if(available_cameras.count() == 0)
    {
        std::cout << "No video device available" << std::endl;
        return 0;
    }

    if(desired_camera > available_cameras.count() - 1)
    {
        std::cout << "Device '"<<desired_camera<<"' not found ... getting default device instead." <<std::endl;
        desired_camera = 0;
    }


    QQmlComponent mainComponent(&engine,QUrl(QStringLiteral("qrc:/main.qml")));
    engine.rootContext()->setContextProperty("cameraId",available_cameras.at(desired_camera).deviceName());

    auto window = static_cast<QQuickWindow *>(mainComponent.create());

    if(nullptr == window)
        return -1;

    qDebug() << mainComponent.errors();

    return app.exec();

}