Add screen capture virtual device for video capture

vlc/devicemanager.cpp

@@ -157,7 +157,10 @@ void DeviceManager::updateDeviceList()
     int i;
 
     // Setup a list of available capture devices
-    // TODO
+    DeviceInfo screenDevice("Screen", "Virtual device for screen capture", false);
+    screenDevice.capabilities = DeviceInfo::VideoCapture;
+    screenDevice.accessList.append(QPair<QByteArray, QString>("screen", ""));
+    vcs.append(screenDevice);
 
     // See the device capabilities and sort them accordingly
     for (i = 0; i < devices.count(); ++ i) {

vlc/mediaobject.cpp

@@ -262,12 +262,15 @@ void MediaObject::setSource(const MediaSource &source)
 {
     debug() << Q_FUNC_INFO;
 
-    // Reset previous streameraders
+    // Reset previous streamereaders
     if (m_streamReader) {
         m_streamReader->unlock();
         m_streamReader = 0;
     }
 
+    // Reset previous isScreen flag
+    m_isScreen = false;
+
     m_mediaSource = source;
 
     QByteArray driverName;
@@ -346,6 +349,11 @@ void MediaObject::setSource(const MediaSource &source)
             }
 
             loadMedia("alsa://" + deviceName);
+        } else if (driverName == "screen") {
+            loadMedia("screen://" + deviceName);
+
+            // Set the isScreen flag needed to add extra options in playInternal
+            m_isScreen = true;
         } else {
             error() << Q_FUNC_INFO << "unsupported MediaSource::CaptureDevice:" << driverName;
             break;
@@ -536,6 +544,11 @@ void MediaObject::playInternal()
         }
     }
 
+    if (m_isScreen) {
+        addOption(m_media, QString("screen-fps=24.0"));
+        addOption(m_media, QString("screen-caching=300"));
+    }
+
     foreach (SinkNode * sink, m_sinks) {
         sink->addToMedia(m_media);
     }

vlc/mediaobject.h

@@ -453,6 +453,7 @@ private:
     QList<SinkNode *> m_sinks;
 
     bool m_hasVideo;
+    bool m_isScreen;
 
     bool m_seekable;
     qint64 m_seekpoint;