Add autoOrientation property to QDeclarativeVideoOutput

The autoOrientation property is a flag to switch on/off
automatic rotation of the video output, depending on the
current screen orientation, to always show the output
upright. This is useful when the VideoOutput is used as
viewfinder for a Camera.

Change-Id: I72753888592dc59c9adaa3343bfec8b168343229
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

src/imports/multimedia/multimedia.cpp

@@ -76,6 +76,7 @@ public:
         qmlRegisterType<QDeclarativeAudio>(uri, 5, 0, "Audio");
         qmlRegisterType<QDeclarativeAudio>(uri, 5, 0, "MediaPlayer");
         qmlRegisterType<QDeclarativeVideoOutput>(uri, 5, 0, "VideoOutput");
+        qmlRegisterType<QDeclarativeVideoOutput, 1>(uri, 5, 1, "VideoOutput");
         qmlRegisterType<QDeclarativeRadio>(uri, 5, 0, "Radio");
         qmlRegisterType<QDeclarativeRadioData>(uri, 5, 0, "RadioData");
         qmlRegisterType<QDeclarativeCamera>(uri, 5, 0, "Camera");

src/imports/multimedia/qdeclarativevideooutput.cpp

@@ -43,6 +43,7 @@
 
 #include "qdeclarativevideooutput_render_p.h"
 #include "qdeclarativevideooutput_window_p.h"
+#include <private/qvideooutputorientationhandler_p.h>
 #include <QtMultimedia/qmediaobject.h>
 #include <QtMultimedia/qmediaservice.h>
 
@@ -127,7 +128,9 @@ QDeclarativeVideoOutput::QDeclarativeVideoOutput(QQuickItem *parent) :
     m_sourceType(NoSource),
     m_fillMode(PreserveAspectFit),
     m_geometryDirty(true),
-    m_orientation(0)
+    m_orientation(0),
+    m_autoOrientation(false),
+    m_screenOrientationHandler(0)
 {
     setFlag(ItemHasContents, true);
 }
@@ -349,6 +352,12 @@ void QDeclarativeVideoOutput::_q_updateGeometry()
     if (m_contentRect != oldContentRect)
         emit contentRectChanged();
 }
+
+void QDeclarativeVideoOutput::_q_screenOrientationChanged(int orientation)
+{
+    setOrientation(orientation);
+}
+
 /*!
     \qmlproperty int QtMultimedia5::VideoOutput::orientation
 
@@ -410,6 +419,45 @@ void QDeclarativeVideoOutput::setOrientation(int orientation)
     emit orientationChanged();
 }
 
+/*!
+    \qmlproperty int QtMultimedia5::VideoOutput::autoOrientation
+
+    This property allows you to enable and disable auto orientation
+    of the video stream, so that its orientation always matches
+    the orientation of the screen. If \c autoOrientation is enabled,
+    the \c orientation property is overwritten.
+
+    By default \c autoOrientation is disabled.
+
+    \since QtMultimedia 5.1
+*/
+bool QDeclarativeVideoOutput::autoOrientation() const
+{
+    return m_autoOrientation;
+}
+
+void QDeclarativeVideoOutput::setAutoOrientation(bool autoOrientation)
+{
+    if (autoOrientation == m_autoOrientation)
+        return;
+
+    m_autoOrientation = autoOrientation;
+    if (m_autoOrientation) {
+        m_screenOrientationHandler = new QVideoOutputOrientationHandler(this);
+        connect(m_screenOrientationHandler, SIGNAL(orientationChanged(int)),
+                this, SLOT(_q_screenOrientationChanged(int)));
+
+        _q_screenOrientationChanged(m_screenOrientationHandler->currentOrientation());
+    } else {
+        disconnect(m_screenOrientationHandler, SIGNAL(orientationChanged(int)),
+                   this, SLOT(_q_screenOrientationChanged(int)));
+        m_screenOrientationHandler->deleteLater();
+        m_screenOrientationHandler = 0;
+    }
+
+    emit autoOrientationChanged();
+}
+
 /*!
     \qmlproperty rectangle QtMultimedia5::VideoOutput::contentRect
 

src/imports/multimedia/qdeclarativevideooutput_p.h

@@ -53,6 +53,7 @@ QT_BEGIN_NAMESPACE
 class QMediaObject;
 class QMediaService;
 class QDeclarativeVideoBackend;
+class QVideoOutputOrientationHandler;
 
 class QDeclarativeVideoOutput : public QQuickItem
 {
@@ -61,6 +62,7 @@ class QDeclarativeVideoOutput : public QQuickItem
     Q_PROPERTY(QObject* source READ source WRITE setSource NOTIFY sourceChanged)
     Q_PROPERTY(FillMode fillMode READ fillMode WRITE setFillMode NOTIFY fillModeChanged)
     Q_PROPERTY(int orientation READ orientation WRITE setOrientation NOTIFY orientationChanged)
+    Q_PROPERTY(bool autoOrientation READ autoOrientation WRITE setAutoOrientation NOTIFY autoOrientationChanged REVISION 1)
     Q_PROPERTY(QRectF sourceRect READ sourceRect NOTIFY sourceRectChanged)
     Q_PROPERTY(QRectF contentRect READ contentRect NOTIFY contentRectChanged)
     Q_ENUMS(FillMode)
@@ -85,6 +87,9 @@ public:
     int orientation() const;
     void setOrientation(int);
 
+    bool autoOrientation() const;
+    void setAutoOrientation(bool);
+
     QRectF sourceRect() const;
     QRectF contentRect() const;
 
@@ -108,6 +113,7 @@ Q_SIGNALS:
     void sourceChanged();
     void fillModeChanged(QDeclarativeVideoOutput::FillMode);
     void orientationChanged();
+    void autoOrientationChanged();
     void sourceRectChanged();
     void contentRectChanged();
 
@@ -120,6 +126,7 @@ private Q_SLOTS:
     void _q_updateMediaObject();
     void _q_updateNativeSize();
     void _q_updateGeometry();
+    void _q_screenOrientationChanged(int);
 
 private:
     bool createBackend(QMediaService *service);
@@ -137,6 +144,8 @@ private:
     QRectF m_lastRect;      // Cache of last rect to avoid recalculating geometry
     QRectF m_contentRect;   // Destination pixel coordinates, unclipped
     int m_orientation;
+    bool m_autoOrientation;
+    QVideoOutputOrientationHandler *m_screenOrientationHandler;
 
     QScopedPointer<QDeclarativeVideoBackend> m_backend;
 };