FPS with QVideoProbe (seems to work on linux only)

cameramanager.cpp

@@ -10,14 +10,6 @@ CameraManager::CameraManager(QObject *parent)
 QList<QCameraInfo> CameraManager::listCameras()
 {
     return QCameraInfo::availableCameras();
-
-    ////        if (cameraInfo.deviceName() == "mycamera")
-    //        camera = new QCamera(QCameraInfo::defaultCamera());
-
-    //        camera->setViewfinder(ui->cameraViewFinder);
-    //        camera->start();
-
-    //        ui->statusBar->showMessage("Aaaaa");
 }
 
 QSharedPointer<QCamera> CameraManager::getCameraByDeviceName(const QString &deviceName)

mainwindow.cpp

@@ -5,7 +5,9 @@
 MainWindow::MainWindow(QWidget *parent) :
     QMainWindow(parent),
     ui(new Ui::MainWindow),
-    cameraManager(new CameraManager)
+    cameraManager(new CameraManager(this)),
+    fpsTimer(new QTimer(this)),
+    fpsProbe(new QVideoProbe(this))
 {
     ui->setupUi(this);
     Console::setOutputControl(ui->consoleOutput);
@@ -20,6 +22,9 @@ MainWindow::MainWindow(QWidget *parent) :
     connect(cameraComboBox, SIGNAL(activated(QVariant)), cameraManager, SLOT(changeSelectedCamera(QVariant)));
     connect(cameraManager, SIGNAL(changedSelectedCamera(QSharedPointer<QCamera>)), this, SLOT(onCameraChanged(QSharedPointer<QCamera>)));
 
+    connect(fpsTimer, SIGNAL(timeout()), this, SLOT(updateFps()));
+    connect(fpsProbe, SIGNAL(videoFrameProbed(QVideoFrame)), this, SLOT(processFrame(QVideoFrame)));
+
     //ui->consoleDockWidget->setVisible(false);
 
     detectCameras();
@@ -65,14 +70,34 @@ void MainWindow::toggleCamera(bool enable)
     QCameraInfo cameraInfo = cameraManager->getSelectedCameraInfo();
 
     if (enable) {
+        fpsProbe->setSource(camera); // Returns true, hopefully.
+
         Console::log(QString("Starting camera %1").arg(cameraInfo.description()));
         camera->load();
         camera->start();
+        fpsTimer->start(1000);
 
         qDebug() << "MainWindow::toggleCamera" << camera->supportedViewfinderResolutions();
         qDebug() << "MainWindow::toggleCamera" << camera->supportedViewfinderPixelFormats();
     } else {
         Console::log(QString("Stopping camera %1").arg(cameraInfo.description()));
         camera->stop();
+        fpsTimer->stop();
+        ui->statusBar->clearMessage();
     }
 }
+
+void MainWindow::processFrame(const QVideoFrame &frame)
+{
+    ++framesInCurrentSecond;
+    //qDebug() << frame.width() << "x" << frame.height();
+
+//    frame.map(QAbstractVideoBuffer::WriteOnly);
+//    frame.unmap();
+}
+
+void MainWindow::updateFps()
+{
+    ui->statusBar->showMessage(QString("%1 FPS").arg(framesInCurrentSecond));
+    framesInCurrentSecond = 0;
+}

mainwindow.h

@@ -7,7 +7,9 @@
 #include <QCameraViewfinder>
 #include <QComboBox>
 #include <QSpacerItem>
+#include <QTimer>
 #include <QVariant>
+#include <QVideoProbe>
 #include "cameramanager.h"
 #include "dataawarecombobox.h"
 
@@ -29,12 +31,17 @@ class MainWindow : public QMainWindow
     CameraManager *cameraManager;
     DataAwareComboBox *cameraComboBox;
     QAction *cameraComboBoxAction;
+    QTimer *fpsTimer;
+    QVideoProbe *fpsProbe;
 
     void detectCameras();
+    unsigned int framesInCurrentSecond = 0;
 
 private slots:
     void toggleCamera(bool enable);
+    void processFrame(const QVideoFrame &frame);
     void onCameraChanged(const QSharedPointer<QCamera> &cameraPtr);
+    void updateFps();
 };
 
 #endif // MAINWINDOW_H