Expose availability from the backend to C++ and QML.

The availabilityError property was static based on the service, but it
can change at run time, so add the plumbing to allow the backend to
report it itself.

Also make sure that both QML and C++ expose the availability.

The radio tuner and data controls previously had properties (but no
signals) for availability - these have been removed.

Change-Id: I9240cf93e2a51b14cd38642f9312ae3c75f05361
Reviewed-by: Ling Hu <ling.hu@nokia.com>

21 files changed, 317 insertions, 95 deletions

diff --git a/src/multimedia/camera/qcamera.cpp b/src/multimedia/camera/qcamera.cpp
index 730a27fb3..580808c03 100644
--- a/src/multimedia/camera/qcamera.cpp
+++ b/src/multimedia/camera/qcamera.cpp
@@ -409,19 +409,9 @@ QCamera::~QCamera()
     }
 }
 
-
 /*!
-    Return true if the camera service is ready to use.
+    Returns the availability state of the camera service.
 */
-bool QCamera::isAvailable() const
-{
-    return availabilityError() == QtMultimedia::NoError;
-}
-
-/*!
-    Returns the error state of the camera service.
-*/
-
 QtMultimedia::AvailabilityError QCamera::availabilityError() const
 {
     Q_D(const QCamera);
@@ -434,7 +424,7 @@ QtMultimedia::AvailabilityError QCamera::availabilityError() const
     if (d->error != QCamera::NoError)
         return QtMultimedia::ResourceError;
 
-    return QtMultimedia::NoError;
+    return QMediaObject::availabilityError();
 }
 
 
diff --git a/src/multimedia/camera/qcamera.h b/src/multimedia/camera/qcamera.h
index c2a7c4277..a48bbc9b5 100644
--- a/src/multimedia/camera/qcamera.h
+++ b/src/multimedia/camera/qcamera.h
@@ -150,7 +150,6 @@ public:
     static QList<QByteArray> availableDevices();
     static QString deviceDescription(const QByteArray &device);
 
-    bool isAvailable() const;
     QtMultimedia::AvailabilityError availabilityError() const;
 
     State state() const;
diff --git a/src/multimedia/controls/controls.pri b/src/multimedia/controls/controls.pri
index 99c9631d1..919e2055c 100644
--- a/src/multimedia/controls/controls.pri
+++ b/src/multimedia/controls/controls.pri
@@ -33,7 +33,8 @@ PUBLIC_HEADERS += \
     controls/qvideoencodercontrol.h \
     controls/qvideorenderercontrol.h \
     controls/qmediaaudioprobecontrol.h \
-    controls/qmediavideoprobecontrol.h
+    controls/qmediavideoprobecontrol.h \
+    controls/qmediaavailabilitycontrol.h
 
 PRIVATE_HEADERS += \
     controls/qaudiodecodercontrol_p.h
@@ -71,4 +72,7 @@ SOURCES += \
     controls/qvideorenderercontrol.cpp \
     controls/qmediaaudioprobecontrol.cpp \
     controls/qmediavideoprobecontrol.cpp \
-    controls/qaudiodecodercontrol_p.cpp
+    controls/qaudiodecodercontrol_p.cpp \
+    controls/qmediaavailabilitycontrol.cpp
+
+
diff --git a/src/multimedia/controls/qmediaavailabilitycontrol.cpp b/src/multimedia/controls/qmediaavailabilitycontrol.cpp
new file mode 100644
index 000000000..76f615049
--- /dev/null
+++ b/src/multimedia/controls/qmediaavailabilitycontrol.cpp
@@ -0,0 +1,109 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmediaavailabilitycontrol.h"
+#include "qmediacontrol_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QMediaAvailabilityControl
+
+    \brief The QMediaAvailabilityControl class supplies a control for reporting availability of a service.
+
+    \inmodule QtMultimedia
+
+    \ingroup multimedia
+    \ingroup multimedia_control
+
+    An instance of QMediaObject (or its derived classes) can report any changes
+    in availability via this control.
+
+    The interface name of QMediaAvailabilityControl is \c com.nokia.Qt.QMediaAvailabilityControl/1.0 as
+    defined in QMediaAvailabilityControl_iid.
+
+    \sa QMediaService::requestControl(), QMediaObject
+*/
+
+/*!
+    \macro QMediaAvailabilityControl_iid
+
+    \c com.nokia.Qt.QMediaAvailabilityControl/1.0
+
+    Defines the interface name of the QMediaAvailabilityControl class.
+
+    \relates QMediaAvailabilityControl
+*/
+
+/*!
+    Constructs an availability control object with \a parent.
+*/
+QMediaAvailabilityControl::QMediaAvailabilityControl(QObject *parent)
+    : QMediaControl(*new QMediaControlPrivate, parent)
+{
+}
+
+/*!
+    Destruct the availability control object.
+*/
+QMediaAvailabilityControl::~QMediaAvailabilityControl()
+{
+}
+
+
+/*!
+  \fn QtMultimedia::AvailabilityError QMediaAvailabilityControl::availability() const
+
+  Returns the current availability of this instance of the media service.
+  If the availability changes at run time (for example, some other media
+  client takes all media resources) the availabilityChanges() signal
+  should be emitted.
+*/
+
+
+/*!
+    \fn void QMediaAvailabilityControl::availabilityChanged(QtMultimedia::AvailabilityError availability)
+
+    Signal emitted when the current \a availability value changed.
+*/
+
+#include "moc_qmediaavailabilitycontrol.cpp"
+QT_END_NAMESPACE
diff --git a/src/multimedia/controls/qmediaavailabilitycontrol.h b/src/multimedia/controls/qmediaavailabilitycontrol.h
new file mode 100644
index 000000000..4b0b8a024
--- /dev/null
+++ b/src/multimedia/controls/qmediaavailabilitycontrol.h
@@ -0,0 +1,78 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMEDIAAVAILABILITYCONTROL_H
+#define QMEDIAAVAILABILITYCONTROL_H
+
+#include <qmediacontrol.h>
+#include <qmediaobject.h>
+#include <qtmedianamespace.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Multimedia)
+
+class Q_MULTIMEDIA_EXPORT QMediaAvailabilityControl : public QMediaControl
+{
+    Q_OBJECT
+
+public:
+    ~QMediaAvailabilityControl();
+
+    virtual QtMultimedia::AvailabilityError availability() const = 0;
+
+signals:
+    void availabilityChanged(QtMultimedia::AvailabilityError availability);
+
+protected:
+    QMediaAvailabilityControl(QObject* parent = 0);
+};
+
+#define QMediaAvailabilityControl_iid "com.nokia.Qt.QMediaAvailabilityControl/1.0"
+Q_MEDIA_DECLARE_CONTROL(QMediaAvailabilityControl, QMediaAvailabilityControl_iid)
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QMEDIAAVAILABILITYCONTROL_H
diff --git a/src/multimedia/controls/qradiodatacontrol.cpp b/src/multimedia/controls/qradiodatacontrol.cpp
index 845b4a759..19656f6ec 100644
--- a/src/multimedia/controls/qradiodatacontrol.cpp
+++ b/src/multimedia/controls/qradiodatacontrol.cpp
@@ -94,18 +94,6 @@ QRadioDataControl::~QRadioDataControl()
 }
 
 /*!
-    \fn bool QRadioDataControl::isAvailable() const
-
-    Returns true if the radio service is ready to use.
-*/
-
-/*!
-    \fn QtMultimedia::AvailabilityError QRadioDataControl::availabilityError() const
-
-    Returns the error state of the radio service.
-*/
-
-/*!
     \fn QRadioData::Error QRadioDataControl::error() const
 
     Returns the error state of a radio data.
diff --git a/src/multimedia/controls/qradiodatacontrol.h b/src/multimedia/controls/qradiodatacontrol.h
index c44c6a193..11723f8c8 100644
--- a/src/multimedia/controls/qradiodatacontrol.h
+++ b/src/multimedia/controls/qradiodatacontrol.h
@@ -59,9 +59,6 @@ class Q_MULTIMEDIA_EXPORT QRadioDataControl : public QMediaControl
 public:
     ~QRadioDataControl();
 
-    virtual bool isAvailable() const = 0;
-    virtual QtMultimedia::AvailabilityError availabilityError() const = 0;
-
     virtual QString stationId() const = 0;
     virtual QRadioData::ProgramType programType() const = 0;
     virtual QString programTypeName() const = 0;
diff --git a/src/multimedia/controls/qradiotunercontrol.cpp b/src/multimedia/controls/qradiotunercontrol.cpp
index c86a0a1cc..c0f3cc146 100644
--- a/src/multimedia/controls/qradiotunercontrol.cpp
+++ b/src/multimedia/controls/qradiotunercontrol.cpp
@@ -100,18 +100,6 @@ QRadioTunerControl::~QRadioTunerControl()
 }
 
 /*!
-    \fn bool QRadioTunerControl::isAvailable() const
-
-    Returns true if the radio service is ready to use.
-*/
-
-/*!
-    \fn QtMultimedia::AvailabilityError QRadioTunerControl::availabilityError() const
-
-    Returns the error state of the radio service.
-*/
-
-/*!
     \fn QRadioTuner::State QRadioTunerControl::state() const
 
     Returns the current radio tuner state.
@@ -235,7 +223,7 @@ QRadioTunerControl::~QRadioTunerControl()
 */
 
 /*!
-    \fn bool QRadioTunerControl::antennaConnected() const
+    \fn bool QRadioTunerControl::isAntennaConnected() const
 
     Identifies if there is an antenna connected to the device.
 
diff --git a/src/multimedia/controls/qradiotunercontrol.h b/src/multimedia/controls/qradiotunercontrol.h
index 354e9c2f1..2e64fbfaa 100644
--- a/src/multimedia/controls/qradiotunercontrol.h
+++ b/src/multimedia/controls/qradiotunercontrol.h
@@ -59,9 +59,6 @@ class Q_MULTIMEDIA_EXPORT QRadioTunerControl : public QMediaControl
 public:
     ~QRadioTunerControl();
 
-    virtual bool isAvailable() const = 0;
-    virtual QtMultimedia::AvailabilityError availabilityError() const = 0;
-
     virtual QRadioTuner::State state() const = 0;
 
     virtual QRadioTuner::Band band() const = 0;
diff --git a/src/multimedia/playback/qmediaplayer.cpp b/src/multimedia/playback/qmediaplayer.cpp
index de7806086..0375f5e93 100644
--- a/src/multimedia/playback/qmediaplayer.cpp
+++ b/src/multimedia/playback/qmediaplayer.cpp
@@ -778,6 +778,17 @@ void QMediaPlayer::setVideoOutput(QAbstractVideoSurface *surface)
     }
 }
 
+/*! \reimp */
+QtMultimedia::AvailabilityError QMediaPlayer::availabilityError() const
+{
+    Q_D(const QMediaPlayer);
+
+    if (!d->control)
+        return QtMultimedia::ServiceMissingError;
+
+    return QMediaObject::availabilityError();
+}
+
 // Enums
 /*!
     \enum QMediaPlayer::State
diff --git a/src/multimedia/playback/qmediaplayer.h b/src/multimedia/playback/qmediaplayer.h
index bf5002406..eed09b566 100644
--- a/src/multimedia/playback/qmediaplayer.h
+++ b/src/multimedia/playback/qmediaplayer.h
@@ -158,6 +158,8 @@ public:
 
     QNetworkConfiguration currentNetworkConfiguration() const;
 
+    QtMultimedia::AvailabilityError availabilityError() const;
+
 public Q_SLOTS:
     void play();
     void pause();
diff --git a/src/multimedia/qmediaobject.cpp b/src/multimedia/qmediaobject.cpp
index b957e9573..3e5773cf1 100644
--- a/src/multimedia/qmediaobject.cpp
+++ b/src/multimedia/qmediaobject.cpp
@@ -47,7 +47,7 @@
 #include <qmediaservice.h>
 #include <qmetadatareadercontrol.h>
 #include <qmediabindableinterface.h>
-
+#include <qmediaavailabilitycontrol.h>
 
 QT_BEGIN_NAMESPACE
 
@@ -64,6 +64,17 @@ void QMediaObjectPrivate::_q_notify()
     }
 }
 
+void QMediaObjectPrivate::_q_availabilityChanged()
+{
+    Q_Q(QMediaObject);
+
+    // Really this should not always emit, but
+    // we can't really tell from here (isAvailable
+    // may not have changed, or the mediaobject's overridden
+    // availabilityError() may not have changed).
+    q->availabilityErrorChanged(q->availabilityError());
+    q->availabilityChanged(q->isAvailable());
+}
 
 /*!
     \class QMediaObject
@@ -104,7 +115,13 @@ QMediaObject::~QMediaObject()
 
 QtMultimedia::AvailabilityError QMediaObject::availabilityError() const
 {
-    return d_func()->service == 0 ? QtMultimedia::ServiceMissingError : QtMultimedia::NoError;
+    if (d_func()->service == 0)
+        return QtMultimedia::ServiceMissingError;
+
+    if (d_func()->availabilityControl)
+        return d_func()->availabilityControl->availability();
+
+    return QtMultimedia::NoError;
 }
 
 /*!
@@ -113,7 +130,7 @@ QtMultimedia::AvailabilityError QMediaObject::availabilityError() const
 
 bool QMediaObject::isAvailable() const
 {
-    return d_func()->service != 0;
+    return availabilityError() == QtMultimedia::NoError;
 }
 
 /*!
@@ -216,7 +233,7 @@ QMediaObject::QMediaObject(QObject *parent, QMediaService *service):
 
     d->service = service;
 
-    setupMetaData();
+    setupControls();
 }
 
 /*!
@@ -237,7 +254,7 @@ QMediaObject::QMediaObject(QMediaObjectPrivate &dd, QObject *parent,
 
     d->service = service;
 
-    setupMetaData();
+    setupControls();
 }
 
 /*!
@@ -360,7 +377,7 @@ QStringList QMediaObject::availableMetaData() const
 */
 
 
-void QMediaObject::setupMetaData()
+void QMediaObject::setupControls()
 {
     Q_D(QMediaObject);
 
@@ -377,6 +394,13 @@ void QMediaObject::setupMetaData()
                     SIGNAL(metaDataAvailableChanged(bool)),
                     SIGNAL(metaDataAvailableChanged(bool)));
         }
+
+        d->availabilityControl = d->service->requestControl<QMediaAvailabilityControl*>();
+        if (d->availabilityControl) {
+            connect(d->availabilityControl,
+                    SIGNAL(availabilityChanged(QtMultimedia::AvailabilityError)),
+                    SLOT(_q_availabilityChanged()));
+        }
     }
 }
 
diff --git a/src/multimedia/qmediaobject.h b/src/multimedia/qmediaobject.h
index f1805da17..3c67dd69f 100644
--- a/src/multimedia/qmediaobject.h
+++ b/src/multimedia/qmediaobject.h
@@ -90,6 +90,7 @@ Q_SIGNALS:
     void metaDataChanged(const QString &key, const QVariant &value);
 
     void availabilityChanged(bool available);
+    void availabilityErrorChanged(QtMultimedia::AvailabilityError error);
 
 protected:
     QMediaObject(QObject *parent, QMediaService *service);
@@ -101,10 +102,11 @@ protected:
     QMediaObjectPrivate *d_ptr;
 
 private:
-    void setupMetaData();
+    void setupControls();
 
     Q_DECLARE_PRIVATE(QMediaObject)
     Q_PRIVATE_SLOT(d_func(), void _q_notify())
+    Q_PRIVATE_SLOT(d_func(), void _q_availabilityChanged())
 };
 
 
diff --git a/src/multimedia/qmediaobject_p.h b/src/multimedia/qmediaobject_p.h
index 310dd0492..33f713403 100644
--- a/src/multimedia/qmediaobject_p.h
+++ b/src/multimedia/qmediaobject_p.h
@@ -67,6 +67,7 @@ QT_MODULE(Multimedia)
 
 
 class QMetaDataReaderControl;
+class QMediaAvailabilityControl;
 
 #define Q_DECLARE_NON_CONST_PUBLIC(Class) \
     inline Class* q_func() { return static_cast<Class *>(q_ptr); } \
@@ -82,9 +83,12 @@ public:
     virtual ~QMediaObjectPrivate() {}
 
     void _q_notify();
+    void _q_availabilityChanged();
 
     QMediaService *service;
     QMetaDataReaderControl *metaDataControl;
+    QMediaAvailabilityControl *availabilityControl;
+
     QTimer* notifyTimer;
     QSet<int> notifyProperties;
 
diff --git a/src/multimedia/radio/qradiodata.cpp b/src/multimedia/radio/qradiodata.cpp
index 7ea099c28..30a495a1a 100644
--- a/src/multimedia/radio/qradiodata.cpp
+++ b/src/multimedia/radio/qradiodata.cpp
@@ -133,29 +133,16 @@ QRadioData::~QRadioData()
 }
 
 /*!
-    Returns true if the radio data service is ready to use.
-*/
-bool QRadioData::isAvailable() const
-{
-    Q_D(const QRadioData);
-
-    if (d->control != 0)
-        return d_func()->control->isAvailable();
-    else
-        return false;
-}
-
-/*!
-    Returns the availability error state.
+    Returns the availability of the radio data service.
 */
 QtMultimedia::AvailabilityError QRadioData::availabilityError() const
 {
     Q_D(const QRadioData);
 
-    if (d->control != 0)
-        return d_func()->control->availabilityError();
-    else
+    if (d->control == 0)
         return QtMultimedia::ServiceMissingError;
+
+    return QMediaObject::availabilityError();
 }
 
 /*!
diff --git a/src/multimedia/radio/qradiodata.h b/src/multimedia/radio/qradiodata.h
index c6c07ade0..03c503134 100644
--- a/src/multimedia/radio/qradiodata.h
+++ b/src/multimedia/radio/qradiodata.h
@@ -90,7 +90,6 @@ public:
     QRadioData(QObject *parent = 0);
     ~QRadioData();
 
-    bool isAvailable() const;
     QtMultimedia::AvailabilityError availabilityError() const;
 
     QString stationId() const;
diff --git a/src/multimedia/radio/qradiotuner.cpp b/src/multimedia/radio/qradiotuner.cpp
index 30b77ebd8..e847d05e0 100644
--- a/src/multimedia/radio/qradiotuner.cpp
+++ b/src/multimedia/radio/qradiotuner.cpp
@@ -149,25 +149,17 @@ QRadioTuner::~QRadioTuner()
 }
 
 /*!
-    Returns true if the radio tuner service is ready to use.
-*/
-bool QRadioTuner::isAvailable() const
-{
-    if (d_func()->control != NULL)
-        return d_func()->control->isAvailable();
-    else
-        return false;
-}
-
-/*!
-    Returns the availability error state.
+    Returns the availability of the radio tuner.
 */
 QtMultimedia::AvailabilityError QRadioTuner::availabilityError() const
 {
-    if (d_func()->control != NULL)
-        return d_func()->control->availabilityError();
-    else
+    if (d_func()->control == 0)
         return QtMultimedia::ServiceMissingError;
+
+    if (!d_func()->control->isAntennaConnected())
+        return QtMultimedia::ResourceError;
+
+    return QMediaObject::availabilityError();
 }
 
 /*!
diff --git a/src/multimedia/radio/qradiotuner.h b/src/multimedia/radio/qradiotuner.h
index 46c6cfeb1..059d54098 100644
--- a/src/multimedia/radio/qradiotuner.h
+++ b/src/multimedia/radio/qradiotuner.h
@@ -86,7 +86,6 @@ public:
     QRadioTuner(QObject *parent = 0);
     ~QRadioTuner();
 
-    bool isAvailable() const;
     QtMultimedia::AvailabilityError availabilityError() const;
 
     State state() const;
diff --git a/src/multimedia/recording/qmediarecorder.cpp b/src/multimedia/recording/qmediarecorder.cpp
index d1f3bdd1a..d57ca0b3e 100644
--- a/src/multimedia/recording/qmediarecorder.cpp
+++ b/src/multimedia/recording/qmediarecorder.cpp
@@ -50,6 +50,7 @@
 #include <qaudioencodercontrol.h>
 #include <qvideoencodercontrol.h>
 #include <qmediacontainercontrol.h>
+#include <qmediaavailabilitycontrol.h>
 #include <qcamera.h>
 #include <qcameracontrol.h>
 
@@ -99,6 +100,7 @@ QMediaRecorderPrivate::QMediaRecorderPrivate():
      audioControl(0),
      videoControl(0),
      metaDataControl(0),
+     availabilityControl(0),
      notifyTimer(0),
      state(QMediaRecorder::StoppedState),
      error(QMediaRecorder::NoError)
@@ -143,6 +145,7 @@ void QMediaRecorderPrivate::_q_serviceDestroyed()
     audioControl = 0;
     videoControl = 0;
     metaDataControl = 0;
+    availabilityControl = 0;
 }
 
 void QMediaRecorderPrivate::_q_updateActualLocation(const QUrl &location)
@@ -179,6 +182,19 @@ void QMediaRecorderPrivate::_q_applySettings()
     }
 }
 
+void QMediaRecorderPrivate::_q_availabilityChanged(QtMultimedia::AvailabilityError error)
+{
+    Q_Q(QMediaRecorder);
+    Q_UNUSED(error);
+
+    // Really this should not always emit, but
+    // we can't really tell from here (isAvailable
+    // may not have changed, or the mediaobject's overridden
+    // availabilityError() may not have changed).
+    q->availabilityErrorChanged(q->availabilityError());
+    q->availabilityChanged(q->isAvailable());
+}
+
 void QMediaRecorderPrivate::restartCamera()
 {
     //restart camera if it can't apply new settings in the Active state
@@ -299,6 +315,11 @@ bool QMediaRecorder::setMediaObject(QMediaObject *object)
 
                 service->releaseControl(d->metaDataControl);
             }
+            if (d->availabilityControl) {
+                disconnect(d->availabilityControl, SIGNAL(availabilityChanged(QtMultimedia::AvailabilityError)),
+                           this, SLOT(_q_availabilityChanged(QtMultimedia::AvailabilityError)));
+                service->releaseControl(d->availabilityControl);
+            }
         }
     }
 
@@ -307,6 +328,7 @@ bool QMediaRecorder::setMediaObject(QMediaObject *object)
     d->audioControl = 0;
     d->videoControl = 0;
     d->metaDataControl = 0;
+    d->availabilityControl = 0;
 
     d->mediaObject = object;
 
@@ -344,6 +366,12 @@ bool QMediaRecorder::setMediaObject(QMediaObject *object)
                     }
                 }
 
+                d->availabilityControl = service->requestControl<QMediaAvailabilityControl*>();
+                if (d->availabilityControl) {
+                    connect(d->availabilityControl, SIGNAL(availabilityChanged(QtMultimedia::AvailabilityError)),
+                            this, SLOT(_q_availabilityChanged(QtMultimedia::AvailabilityError)));
+                }
+
                 connect(d->control, SIGNAL(stateChanged(QMediaRecorder::State)),
                         this, SLOT(_q_stateChanged(QMediaRecorder::State)));
 
@@ -399,24 +427,28 @@ bool QMediaRecorder::setMediaObject(QMediaObject *object)
 
 /*!
     Returns true if media recorder service ready to use.
+
+    \sa availabilityChanged()
 */
 bool QMediaRecorder::isAvailable() const
 {
-    if (d_func()->control != NULL)
-        return true;
-    else
-        return false;
+    return availabilityError() == QtMultimedia::NoError;
 }
 
 /*!
     Returns the availability error code.
+
+    \sa availabilityErrorChanged()
 */
 QtMultimedia::AvailabilityError QMediaRecorder::availabilityError() const
 {
-    if (d_func()->control != NULL)
-        return QtMultimedia::NoError;
-    else
+    if (d_func()->control == NULL)
         return QtMultimedia::ServiceMissingError;
+
+    if (d_func()->availabilityControl)
+        return d_func()->availabilityControl->availability();
+
+    return QtMultimedia::NoError;
 }
 
 QUrl QMediaRecorder::outputLocation() const
@@ -767,7 +799,7 @@ void QMediaRecorder::setEncodingSettings(const QAudioEncoderSettings &audio,
     Start recording.
 
     This is an asynchronous call, with signal
-    stateCahnged(QMediaRecorder::RecordingState) being emitted when recording
+    stateChanged(QMediaRecorder::RecordingState) being emitted when recording
     started, otherwise the error() signal is emitted.
 */
 
@@ -852,6 +884,18 @@ void QMediaRecorder::stop()
 */
 
 /*!
+    \fn QMediaRecorder::availableChanged(bool available)
+
+    Signals that the media recorder is now available (if \a available is true), or not.
+*/
+
+/*!
+    \fn QMediaRecorder::availabilityErrorChanged(QtMultimedia::AvailabilityError availability)
+
+    Signals that the service availability has changed to \a availability.
+*/
+
+/*!
     \fn QMediaRecorder::mutedChanged(bool muted)
 
     Signals that the \a muted state has changed. If true the recording is being muted.
diff --git a/src/multimedia/recording/qmediarecorder.h b/src/multimedia/recording/qmediarecorder.h
index 1aac73cf2..84a6eca63 100644
--- a/src/multimedia/recording/qmediarecorder.h
+++ b/src/multimedia/recording/qmediarecorder.h
@@ -42,6 +42,7 @@
 #ifndef QMEDIARECORDER_H
 #define QMEDIARECORDER_H
 
+#include <qtmedianamespace.h>
 #include <qmediaobject.h>
 #include <qmediaencodersettings.h>
 #include <qmediabindableinterface.h>
@@ -173,6 +174,9 @@ Q_SIGNALS:
     void metaDataChanged();
     void metaDataChanged(const QString &key, const QVariant &value);
 
+    void availabilityChanged(bool available);
+    void availabilityErrorChanged(QtMultimedia::AvailabilityError error);
+
 protected:
     QMediaRecorder(QMediaRecorderPrivate &dd, QMediaObject *mediaObject, QObject *parent = 0);
     bool setMediaObject(QMediaObject *object);
@@ -188,6 +192,7 @@ private:
     Q_PRIVATE_SLOT(d_func(), void _q_updateActualLocation(const QUrl &))
     Q_PRIVATE_SLOT(d_func(), void _q_updateNotifyInterval(int))
     Q_PRIVATE_SLOT(d_func(), void _q_applySettings())
+    Q_PRIVATE_SLOT(d_func(), void _q_availabilityChanged(QtMultimedia::AvailabilityError))
 };
 
 QT_END_NAMESPACE
diff --git a/src/multimedia/recording/qmediarecorder_p.h b/src/multimedia/recording/qmediarecorder_p.h
index b899665eb..03919ef19 100644
--- a/src/multimedia/recording/qmediarecorder_p.h
+++ b/src/multimedia/recording/qmediarecorder_p.h
@@ -53,6 +53,7 @@ class QMediaContainerControl;
 class QAudioEncoderControl;
 class QVideoEncoderControl;
 class QMetaDataWriterControl;
+class QMediaAvailabilityControl;
 class QTimer;
 
 class QMediaRecorderPrivate
@@ -73,6 +74,7 @@ public:
     QAudioEncoderControl *audioControl;
     QVideoEncoderControl *videoControl;
     QMetaDataWriterControl *metaDataControl;
+    QMediaAvailabilityControl *availabilityControl;
 
     bool settingsChanged;
 
@@ -90,6 +92,7 @@ public:
     void _q_notify();
     void _q_updateNotifyInterval(int ms);
     void _q_applySettings();
+    void _q_availabilityChanged(QtMultimedia::AvailabilityError error);
 
     QMediaRecorder *q_ptr;
 };