qtmultimedia/examples/multimedia/video/qmlvideofx/main.cpp

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#include <QtCore/QStandardPaths>
#include <QtCore/QStringList>
#include <QtQml/QQmlContext>
#include <QtGui/QGuiApplication>
#include <QtQuick/QQuickItem>
#include <QtQuick/QQuickView>
#include "filereader.h"
#include "trace.h"

#ifdef PERFORMANCEMONITOR_SUPPORT
#include "performancemonitordeclarative.h"
#endif

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

#ifdef PERFORMANCEMONITOR_SUPPORT
    PerformanceMonitor::qmlRegisterTypes();
#endif

    QUrl fileName;
    qreal volume = 0.5;
    QStringList args = app.arguments();
#ifdef PERFORMANCEMONITOR_SUPPORT
    PerformanceMonitor::State performanceMonitorState;
#endif
    for (int i = 1; i < args.size(); ++i) {
        const QByteArray arg = args.at(i).toUtf8();
        if (arg.startsWith('-')) {
            if ("-volume" == arg) {
                if (i + 1 < args.size())
                    volume = 0.01 * args.at(++i).toInt();
                else
                    qtTrace() << "Option \"-volume\" takes a value";
            }
#ifdef PERFORMANCEMONITOR_SUPPORT
            else if (performanceMonitorState.parseArgument(arg)) {
                // Do nothing
            }
#endif
            else {
                qtTrace() << "Option" << arg << "ignored";
            }
        } else {
            if (fileName.isEmpty())
                fileName = QUrl::fromLocalFile(arg);
            else
                qtTrace() << "Argument" << arg << "ignored";
        }
    }

    QQuickView viewer;

    viewer.setSource(QUrl(QLatin1String("qrc:///qml/qmlvideofx/Main.qml")));
    QQuickItem *rootObject = viewer.rootObject();
    rootObject->setProperty("fileName", fileName);
    viewer.rootObject()->setProperty("volume", volume);

#ifdef PERFORMANCEMONITOR_SUPPORT
    if (performanceMonitorState.valid) {
        rootObject->setProperty("perfMonitorsLogging", performanceMonitorState.logging);
        rootObject->setProperty("perfMonitorsVisible", performanceMonitorState.visible);
    }
    QObject::connect(&viewer, SIGNAL(afterRendering()),
                     rootObject, SLOT(qmlFramePainted()));
#endif

    FileReader fileReader;
    viewer.rootContext()->setContextProperty("fileReader", &fileReader);

    const QUrl appPath(QUrl::fromLocalFile(app.applicationDirPath()));
    const QStringList picturesLocation = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
    const QUrl imagePath = picturesLocation.isEmpty() ? appPath : QUrl::fromLocalFile(picturesLocation.first());
    viewer.rootContext()->setContextProperty("imagePath", imagePath);

    const QStringList moviesLocation = QStandardPaths::standardLocations(QStandardPaths::MoviesLocation);
    const QUrl videoPath = moviesLocation.isEmpty() ? appPath : QUrl::fromLocalFile(moviesLocation.first());
    viewer.rootContext()->setContextProperty("videoPath", videoPath);

    viewer.setTitle("qmlvideofx");
    viewer.setFlags(Qt::Window | Qt::WindowSystemMenuHint | Qt::WindowTitleHint |
                          Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint);
    viewer.setMinimumSize(QSize(1280, 720));
    viewer.setResizeMode(QQuickView::SizeRootObjectToView);

    viewer.show();

    // Delay invocation of init until the event loop has started, to work around
    // a GL context issue on Harmattan: without this, we get the following error
    // when the first ShaderEffectItem is created:
    // "QGLShaderProgram::addShader: Program and shader are not associated with same context"
    QMetaObject::invokeMethod(viewer.rootObject(), "init", Qt::QueuedConnection);

    return app.exec();
}