- Qt 5.3
- Qt Multimedia
- QML Video Example
- main.cpp Example File
- Qt 5.3.2 Reference Documentation

# main.cpp Example File

video/qmlvideo/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the Qt Mobility Components.
    **
    ** $QT_BEGIN_LICENSE:LGPL$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and Digia.  For licensing terms and
    ** conditions see http://qt.digia.com/licensing.  For further information
    ** use the contact form at http://qt.digia.com/contact-us.
    **
    ** 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 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.LGPL included in the
    ** packaging of this file.  Please review the following information to
    ** ensure the GNU Lesser General Public License version 2.1 requirements
    ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
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    ** rights.  These rights are described in the Digia Qt LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** GNU General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU
    ** General Public License version 3.0 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.  Please review the following information to
    ** ensure the GNU General Public License version 3.0 requirements will be
    ** met: http://www.gnu.org/copyleft/gpl.html.
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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.show();

        return app.exec();
    }