mediaplayer: crash in settings dialog.

The MediaPlayer requires that an output device is available.

Task-number: QTBUG-4755
Reviewed-by: Gareth Stockwell
(cherry picked from commit 16e21cb0beb0e5f5189048b95d1cb74ae0c0702a)

3 files changed, 42 insertions, 15 deletions

diff --git a/src/3rdparty/phonon/mmf/audiooutput.cpp b/src/3rdparty/phonon/mmf/audiooutput.cpp
index 58e2f5e..5a00f60 100644
--- a/src/3rdparty/phonon/mmf/audiooutput.cpp
+++ b/src/3rdparty/phonon/mmf/audiooutput.cpp
@@ -18,6 +18,8 @@ along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <e32debug.h>
 
+#include <QCoreApplication>
+
 #include "audiooutput.h"
 #include "defs.h"
 #include "mediaobject.h"
@@ -74,16 +76,13 @@ void MMF::AudioOutput::setVolume(qreal volume)
 
 int MMF::AudioOutput::outputDevice() const
 {
-    return 0;
-}
-
-bool MMF::AudioOutput::setOutputDevice(int)
-{
-    return true;
+    return AudioOutputDeviceID;
 }
 
-bool MMF::AudioOutput::setOutputDevice(const Phonon::AudioOutputDevice &)
+bool MMF::AudioOutput::setOutputDevice(int index)
 {
+    Q_ASSERT_X(index == AudioOutputDeviceID, Q_FUNC_INFO,
+               "We only support one output device, with id 0");
     return true;
 }
 
@@ -101,4 +100,17 @@ bool MMF::AudioOutput::activateOnMediaObject(MediaObject *mo)
     return true;
 }
 
+QHash<QByteArray, QVariant> MMF::AudioOutput::audioOutputDescription(int index)
+{
+    if (index == AudioOutputDeviceID) {
+        QHash<QByteArray, QVariant> retval;
+
+        retval.insert("name", QCoreApplication::translate("Phonon::MMF", "Audio Output"));
+        retval.insert("description", QCoreApplication::translate("Phonon::MMF", "The audio output device"));
+        retval.insert("available", true);
+
+        return retval;
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/src/3rdparty/phonon/mmf/audiooutput.h b/src/3rdparty/phonon/mmf/audiooutput.h
index 0a962a9..d0ba086 100644
--- a/src/3rdparty/phonon/mmf/audiooutput.h
+++ b/src/3rdparty/phonon/mmf/audiooutput.h
@@ -19,6 +19,8 @@ along with this library.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef PHONON_MMF_AUDIOOUTPUT_H
 #define PHONON_MMF_AUDIOOUTPUT_H
 
+#include <QHash>
+
 #include "mmf_medianode.h"
 #include <phonon/audiooutputinterface.h>
 
@@ -65,10 +67,12 @@ public:
      */
     virtual bool setOutputDevice(int);
 
-    /**
-     * Has no effect.
-     */
-    virtual bool setOutputDevice(const Phonon::AudioOutputDevice &);
+    static QHash<QByteArray, QVariant> audioOutputDescription(int index);
+
+    enum Constants
+    {
+        AudioOutputDeviceID = 0
+    };
 
 protected:
     virtual bool activateOnMediaObject(MediaObject *mo);
@@ -78,6 +82,7 @@ Q_SIGNALS:
     void audioDeviceFailed();
 
 private:
+
     void setVolumeObserver(VolumeObserver* observer);
 
     qreal                           m_volume;
diff --git a/src/3rdparty/phonon/mmf/backend.cpp b/src/3rdparty/phonon/mmf/backend.cpp
index be43f46..f542ec9 100644
--- a/src/3rdparty/phonon/mmf/backend.cpp
+++ b/src/3rdparty/phonon/mmf/backend.cpp
@@ -107,6 +107,12 @@ QList<int> Backend::objectDescriptionIndexes(ObjectDescriptionType type) const
     {
         case EffectType:
             retval.append(EffectFactory::effectIndexes());
+            break;
+        case AudioOutputDeviceType:
+            // We only have one possible output device, but we need at least
+            // one.
+            retval.append(AudioOutput::AudioOutputDeviceID);
+            break;
         default:
             ;
     }
@@ -119,10 +125,14 @@ QHash<QByteArray, QVariant> Backend::objectDescriptionProperties(ObjectDescripti
 {
     TRACE_CONTEXT(Backend::connectNodes, EBackend);
 
-    if (type == EffectType)
-        return EffectFactory::audioEffectDescriptions(AbstractAudioEffect::Type(index));
-    else 
-        return QHash<QByteArray, QVariant>();
+    switch (type) {
+        case EffectType:
+            return EffectFactory::audioEffectDescriptions(AbstractAudioEffect::Type(index));
+        case AudioOutputDeviceType:
+            return AudioOutput::audioOutputDescription(index);
+        default:
+            return QHash<QByteArray, QVariant>();
+    }
 }
 
 bool Backend::startConnectionChange(QSet<QObject *>)