main.cpp Example File

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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();
  }