qt-everywhere-src-5.15.1/qtmultimedia/examples/multimedia/video/qmlvideo/main.cpp

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

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

#ifdef REQUEST_PERMISSIONS_ON_ANDROID
#include <QtAndroid>

bool requestStoragePermission() {
    using namespace QtAndroid;

    QString permission = QStringLiteral("android.permission.WRITE_EXTERNAL_STORAGE");
    const QHash<QString, PermissionResult> results = requestPermissionsSync(QStringList({permission}));
    if (!results.contains(permission) || results[permission] == PermissionResult::Denied) {
        qWarning() << "Couldn't get permission: " << permission;
        return false;
    }

    return true;
}
#endif

static const QString DefaultFileName1 = "";
static const QString DefaultFileName2 = "";

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

#ifdef PERFORMANCEMONITOR_SUPPORT
    PerformanceMonitor::qmlRegisterTypes();
#endif
#ifdef REQUEST_PERMISSIONS_ON_ANDROID
    if (!requestStoragePermission())
        return -1;
#endif

    QString source1, source2;
    qreal volume = 0.5;
    QStringList args = app.arguments();
#ifdef PERFORMANCEMONITOR_SUPPORT
    PerformanceMonitor::State performanceMonitorState;
#endif
    bool sourceIsUrl = false;
    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.count())
                    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 if ("-url" == arg) {
                sourceIsUrl = true;
            } else {
                qtTrace() << "Option" << arg << "ignored";
            }
        } else {
            if (source1.isEmpty())
                source1 = arg;
            else if (source2.isEmpty())
                source2 = arg;
            else
                qtTrace() << "Argument" << arg << "ignored";
        }
    }

    QUrl url1, url2;
    if (sourceIsUrl) {
        url1 = source1;
        url2 = source2;
    } else {
        if (!source1.isEmpty())
            url1 = QUrl::fromLocalFile(source1);
        if (!source2.isEmpty())
            url2 = QUrl::fromLocalFile(source2);
    }

    QQuickView viewer;
    viewer.setSource(QUrl("qrc:///qml/qmlvideo/main.qml"));
    QObject::connect(viewer.engine(), &QQmlEngine::quit, &viewer, &QQuickView::close);

    QQuickItem *rootObject = viewer.rootObject();
    rootObject->setProperty("source1", url1);
    rootObject->setProperty("source2", url2);
    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

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

    QMetaObject::invokeMethod(rootObject, "init");

    viewer.setMinimumSize(QSize(640, 360));
    viewer.show();

    return app.exec();
}