Cleaning up reading from a webcam.

gui/OpenFaceOffline/MainWindow.xaml.cs

@@ -116,7 +116,7 @@ namespace OpenFaceOffline
         public bool RecordPose { get; set; } = true; // Head pose (position and orientation)
         public bool RecordAUs { get; set; } = true; // Facial action units
         public bool RecordGaze { get; set; } = true; // Eye gaze
-        public bool RecordTracked { get; set; } = false; // Recording tracked videos or images
+        public bool RecordTracked { get; set; } = true; // Recording tracked videos or images
 
         // Visualisation options
         public bool ShowTrackedVideo { get; set; } = true; // Showing the actual tracking
@@ -166,7 +166,7 @@ namespace OpenFaceOffline
                 ProcessSequence(reader);
 
                 // Before continuing to next video make sure the user did not stop the processing
-                if(!thread_running)
+                if (!thread_running)
                 {
                     break;
                 }
@@ -248,9 +248,15 @@ namespace OpenFaceOffline
                 processing_fps.AddFrame();
             }
 
+            // Finalize the recording and flush to disk
+            recorder.Close();
+
             // Post-process the AU recordings
             face_analyser.PostProcessOutputFile(recorder.GetCSVFile());
 
+            // Close the open video/webcam
+            reader.Close();
+
             EndMode();
 
         }
@@ -342,6 +348,7 @@ namespace OpenFaceOffline
 
                 lastFrameTime = CurrentTime;
                 processing_fps.AddFrame();
+                
                 // TODO how to report errors from the reader here? exceptions? logging? Problem for future versions?
             }
 
@@ -676,13 +683,12 @@ namespace OpenFaceOffline
             using (var fbd = new FolderBrowserDialog())
             {
                 DialogResult result = fbd.ShowDialog();
-                if (result == System.Windows.Forms.DialogResult.OK && !string.IsNullOrWhiteSpace(fbd.SelectedPath))
+                if (result == System.Windows.Forms.DialogResult.OK)
                 {
                     to_return = fbd.SelectedPath;
                 }
-                else
+                else if(!string.IsNullOrWhiteSpace(fbd.SelectedPath))
                 {
-                    // TODO warning message here
                     string messageBoxText = "Could not open the directory.";
                     string caption = "Invalid directory";
                     MessageBoxButton button = MessageBoxButton.OK;
@@ -760,9 +766,7 @@ namespace OpenFaceOffline
         {
             StopTracking();
 
-            Dispatcher.Invoke(DispatcherPriority.Render, new TimeSpan(0, 0, 0, 2, 0), (Action)(() =>
+            // If camera selection has already been done, no need to re-populate the list as it is quite slow
-            {
-
             if (cam_sec == null)
             {
                 cam_sec = new CameraSelection();
@@ -786,11 +790,13 @@ namespace OpenFaceOffline
                 int width = cam_sec.selected_camera.Item2;
                 int height = cam_sec.selected_camera.Item3;
 
-//                    processing_thread = new Thread(() => ProcessingLoop(cam_id, width, height));
+                SequenceReader reader = new SequenceReader(cam_id, width, height);
-//                    processing_thread.Start();
+
+                processing_thread = new Thread(() => ProcessSequence(reader));
+                processing_thread.Name = "Webcam processing";
+                processing_thread.Start();
 
             }
-            }));
         }
 
 

lib/local/CppInerop/SequenceReader.h

@@ -98,11 +98,11 @@ namespace UtilitiesOF {
 		}
 
 		// Can provide a webcam id
-		SequenceReader(int webcam_id)
+		SequenceReader(int webcam_id, int width, int height)
 		{
 			m_sequence_capture = new Utilities::SequenceCapture();
 			
-			bool success = m_sequence_capture->OpenWebcam(webcam_id);
+			bool success = m_sequence_capture->OpenWebcam(webcam_id, width, height);
 
 			if (!success)
 			{
@@ -184,6 +184,10 @@ namespace UtilitiesOF {
 			return m_gray_frame;
 		}
 
+		void Close() {
+			m_sequence_capture->Close();
+		}
+
 		// Finalizer. Definitely called before Garbage Collection,
 		// but not automatically called on explicit Dispose().
 		// May be called multiple times.
@@ -343,6 +347,7 @@ namespace UtilitiesOF {
 					std::vector<std::pair<int, int>> common_resolutions;
 					common_resolutions.push_back(std::pair<int, int>(320, 240));
 					common_resolutions.push_back(std::pair<int, int>(640, 480));
+					common_resolutions.push_back(std::pair<int, int>(800, 600));
 					common_resolutions.push_back(std::pair<int, int>(960, 720));
 					common_resolutions.push_back(std::pair<int, int>(1280, 720));
 					common_resolutions.push_back(std::pair<int, int>(1280, 960));

lib/local/Utilities/include/SequenceCapture.h

@@ -87,6 +87,8 @@ namespace Utilities
 
 		bool IsOpened();
 
+		void Close();
+
 		int frame_width;
 		int frame_height;
 

lib/local/Utilities/src/SequenceCapture.cpp

@@ -256,6 +256,12 @@ bool SequenceCapture::OpenWebcam(int device, int image_width, int image_height,
 
 }
 
+void SequenceCapture::Close()
+{
+	if (capture.isOpened())
+		capture.release();
+}
+
 // Destructor that releases the capture
 SequenceCapture::~SequenceCapture()
 {