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>

3 files changed, 60 insertions, 8 deletions

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;
 };