Prevent crash when video is played without a VideoWidget

The Phonon API allows video to be played via a Phonon::MediaObject,
even if no Phonon::VideoWidget has been connected to it.  This
patch prevents the Phonon MMF backend crashing in this scenario
due to dereferencing a null pointer.

Reviewed-by: Thierry Bastian

3 files changed, 18 insertions, 4 deletions

diff --git a/src/3rdparty/phonon/mmf/abstractvideoplayer.cpp b/src/3rdparty/phonon/mmf/abstractvideoplayer.cpp
index 2e0ab1c..ecfce9e 100644
--- a/src/3rdparty/phonon/mmf/abstractvideoplayer.cpp
+++ b/src/3rdparty/phonon/mmf/abstractvideoplayer.cpp
@@ -211,7 +211,8 @@ void MMF::AbstractVideoPlayer::aspectRatioChanged()
     TRACE_CONTEXT(AbstractVideoPlayer::aspectRatioChanged, EVideoInternal);
     TRACE_ENTRY("state %d aspectRatio %d", state());
 
-    updateScaleFactors(m_videoOutput->videoWindowSize());
+    if (m_videoOutput)
+        updateScaleFactors(m_videoOutput->videoWindowSize());
 
     TRACE_EXIT_0();
 }
@@ -221,7 +222,8 @@ void MMF::AbstractVideoPlayer::scaleModeChanged()
     TRACE_CONTEXT(AbstractVideoPlayer::scaleModeChanged, EVideoInternal);
     TRACE_ENTRY("state %d", state());
 
-    updateScaleFactors(m_videoOutput->videoWindowSize());
+    if (m_videoOutput)
+        updateScaleFactors(m_videoOutput->videoWindowSize());
 
     TRACE_EXIT_0();
 }
@@ -357,6 +359,8 @@ void MMF::AbstractVideoPlayer::videoOutputChanged()
 
 void MMF::AbstractVideoPlayer::initVideoOutput()
 {
+    Q_ASSERT(m_videoOutput);
+
     bool connected = connect(
         m_videoOutput, SIGNAL(videoWindowChanged()),
         this, SLOT(videoWindowChanged())
@@ -400,6 +404,8 @@ QSize scaleToAspect(const QSize &srcRect, int aspectWidth, int aspectHeight)
 
 void MMF::AbstractVideoPlayer::updateScaleFactors(const QSize &windowSize, bool apply)
 {
+    Q_ASSERT(m_videoOutput);
+
     if (m_videoFrameSize.isValid()) {
         QRect videoRect;
 
diff --git a/src/3rdparty/phonon/mmf/videoplayer_dsa.cpp b/src/3rdparty/phonon/mmf/videoplayer_dsa.cpp
index 1925471..f0255b1 100644
--- a/src/3rdparty/phonon/mmf/videoplayer_dsa.cpp
+++ b/src/3rdparty/phonon/mmf/videoplayer_dsa.cpp
@@ -61,6 +61,8 @@ DsaVideoPlayer::~DsaVideoPlayer()
 
 void MMF::DsaVideoPlayer::videoWindowScreenRectChanged()
 {
+    Q_ASSERT(m_videoOutput);
+
     QRect windowRect = static_cast<DsaVideoOutput *>(m_videoOutput)->videoWindowScreenRect();
 
     // Clip to physical window size
@@ -130,6 +132,8 @@ void MMF::DsaVideoPlayer::createPlayer()
 
 void MMF::DsaVideoPlayer::initVideoOutput()
 {
+    Q_ASSERT(m_videoOutput);
+
     bool connected = connect(
         m_videoOutput, SIGNAL(videoWindowScreenRectChanged()),
         this, SLOT(videoWindowScreenRectChanged())
@@ -156,7 +160,8 @@ void MMF::DsaVideoPlayer::initVideoOutput()
 
 void MMF::DsaVideoPlayer::prepareCompleted()
 {
-    videoWindowScreenRectChanged();
+    if (m_videoOutput)
+        videoWindowScreenRectChanged();
 }
 
 void MMF::DsaVideoPlayer::handleVideoWindowChanged()
diff --git a/src/3rdparty/phonon/mmf/videoplayer_surface.cpp b/src/3rdparty/phonon/mmf/videoplayer_surface.cpp
index fda7342..5d8db26 100644
--- a/src/3rdparty/phonon/mmf/videoplayer_surface.cpp
+++ b/src/3rdparty/phonon/mmf/videoplayer_surface.cpp
@@ -59,7 +59,8 @@ SurfaceVideoPlayer::~SurfaceVideoPlayer()
 
 void MMF::SurfaceVideoPlayer::videoWindowSizeChanged()
 {
-    updateScaleFactors(m_videoOutput->videoWindowSize());
+    if (m_videoOutput)
+        updateScaleFactors(m_videoOutput->videoWindowSize());
 }
 
 
@@ -80,6 +81,8 @@ void MMF::SurfaceVideoPlayer::createPlayer()
 
 void MMF::SurfaceVideoPlayer::initVideoOutput()
 {
+    Q_ASSERT(m_videoOutput);
+
     bool connected = connect(
         m_videoOutput, SIGNAL(videoWindowSizeChanged()),
         this, SLOT(videoWindowSizeChanged())