Qt 5.6 | Qt Multimedia | QML Video Example | main.cpp Example File

Qt 5.6.2 Reference Documentation

# main.cpp Example File

multimedia/video/qmlvideo/main.cpp

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      **
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      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the Qt Mobility Components.
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      ** $QT_BEGIN_LICENSE:LGPL21$
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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();
      }