WMF: release video controls before releasing the session

For the VideoRendererControl, also stop the video surface at the same
time.
This fixes a crash when changing video.

Change-Id: I49484f8b277c345dafb3e5947cf5d23df15546f3
Reviewed-by: Jason Barron <jason@cutehacks.com>

src/plugins/wmf/player/mfvideorenderercontrol.cpp

@@ -1781,6 +1781,7 @@ namespace
             , m_sink(0)
             , m_rendererControl(rendererControl)
             , m_attributes(0)
+            , m_surface(0)
         {
             MFCreateAttributes(&m_attributes, 0);
             m_sink = new MediaSink(rendererControl);
@@ -2143,6 +2144,9 @@ MFVideoRendererControl::~MFVideoRendererControl()
 
 void MFVideoRendererControl::clear()
 {
+    if (m_surface)
+        m_surface->stop();
+
     if (m_currentActivate) {
         m_currentActivate->ShutdownObject();
         m_currentActivate->Release();
@@ -2150,6 +2154,11 @@ void MFVideoRendererControl::clear()
     m_currentActivate = NULL;
 }
 
+void MFVideoRendererControl::releaseActivate()
+{
+    clear();
+}
+
 QAbstractVideoSurface *MFVideoRendererControl::surface() const
 {
     return m_surface;
@@ -2209,10 +2218,8 @@ IMFActivate* MFVideoRendererControl::createActivate()
     clear();
 
     m_currentActivate = new VideoRendererActivate(this);
-    if (m_surface) {
+    if (m_surface)
         setSurface(m_surface);
-        supportedFormatsChanged();
-    }
 
     return m_currentActivate;
 }