- Qt 5.5
- Qt Multimedia
- QML Video Example
- main.cpp Example File
- Qt 5.5.1 Reference Documentation

# main.cpp Example File

video/qmlvideo/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the Qt Mobility Components.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
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    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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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

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

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

    #ifdef PERFORMANCEMONITOR_SUPPORT
        PerformanceMonitor::qmlRegisterTypes();
    #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(), SIGNAL(quit()), &viewer, SLOT(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();
    }