API changes to QML element MediaPlayer aka Audio

Changed Video.qml for new API
Removed lowercase enum copies, replaced with calling
	parent (VideoOutput, MediaPlayer) enums
Removed properties playing, paused
Removed signals started, resumed
Added readonly property playbackState
Added signal playing
Added autoPlay property
Fixed unit tests for new API

Added backwards compatibility for QtMultimedia 4

Change-Id: I27c91cd46d91402b8c4c42bb7d4961ad67909aeb
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/imports/multimedia/Video.qml

@@ -95,17 +95,16 @@ Item {
         area.
 
         \list
-        \o stretch - the video is scaled to fit.
-        \o preserveAspectFit - the video is scaled uniformly to fit without
+        \o VideoOutput.Stretch - the video is scaled to fit
+        \o VideoOutput.PreserveAspectFit - the video is scaled uniformly to fit without
             cropping
-        \o preserveAspectCrop - the video is scaled uniformly to fill, cropping
+        \o VideoOuput.PreserveAspectCrop - the video is scaled uniformly to fill, cropping
             if necessary
         \endlist
 
         Because this element is a convenience element in QML, it does not
-        support enumerations directly. In contrast to \l VideoOutput and other
-        elements, the values to set for fillMode all start with lowercase
-        letters to work around this.
+        support enumerations directly, so enumerations from VideoOuput are
+        used to access the available fill modes.
 
         The default fill mode is preserveAspectFit.
     */
@@ -119,15 +118,24 @@ Item {
     */
     property alias orientation:         videoOut.orientation
 
-    /* Properties to emulate enumeration for fillMode, documented above */
-    /*! \internal */
-    readonly property int stretch:             VideoOutput.Stretch
-    /*! \internal */
-    readonly property int preserveAspectFit:   VideoOutput.PreserveAspectFit
-    /*! \internal */
-    readonly property int preserveAspectCrop:  VideoOutput.PreserveAspectCrop
 
     /*** Properties of MediaPlayer ***/
+
+    /*!
+        \qmlproperty enumeration Video::playbackState
+
+        This read only property indicates the playback state of the media.
+
+        \list
+        \o MediaPlayer.PlayingState - the media is playing
+        \o MediaPlayer.PausedState - the media is paused
+        \o MediaPlayer.StoppedState - the media is stopped
+        \endlist
+
+        The default state is MediaPlayer.StoppedState.
+    */
+    property alias playbackState:        player.playbackState
+
     /*!
         \qmlproperty bool Video::autoLoad
 
@@ -194,15 +202,6 @@ Item {
     */
     property alias muted:           player.muted
 
-    /*!
-        \qmlproperty bool Video::paused
-
-        This property holds whether the media is paused.
-
-        Defaults to false, and can be set to true to pause playback.
-    */
-    property alias paused:          player.paused
-
     /*!
         \qmlproperty real Video::playbackRate
 
@@ -211,15 +210,6 @@ Item {
     */
     property alias playbackRate:    player.playbackRate
 
-    /*!
-        \qmlproperty bool Video::playing
-
-        This property holds whether the media is playing.
-
-        Defaults to false, and can be set to true to start playback.
-    */
-    property alias playing:         player.playing
-
     /*!
         \qmlproperty int Video::position
 
@@ -269,17 +259,19 @@ Item {
     property alias volume:          player.volume
 
     /*!
-        \qmlsignal Video::resumed()
+        \qmlproperty bool Video::autoPlay
 
-        This signal is emitted when playback is resumed from the paused state.
+        This property determines whether the media should begin playback automatically.
     */
-    signal resumed
+    property alias autoPlay:        player.autoPlay
+
     /*!
-        \qmlsignal Video::started()
+        \qmlsignal Video::paused()
 
-        This signal is emitted when playback is started.
+        This signal is emitted when playback is paused.
     */
-    signal started
+    signal paused
+
     /*!
         \qmlsignal Video::stopped()
 
@@ -287,6 +279,19 @@ Item {
     */
     signal stopped
 
+    /*!
+        \qmlsignal Video::playing()
+
+        This signal is emitted when playback is started or continued.
+    */
+    signal playing
+
+    /*!
+        \qmlsignal Video::playbackStateChanged()
+
+        This signal is emitted whenever the state of playback changes.
+    */
+    signal playbackStateChanged
 
     VideoOutput {
         id: videoOut
@@ -296,18 +301,17 @@ Item {
 
     MediaPlayer {
         id: player
-        onResumed: video.resumed()
-        onStarted: video.started()
+        onPaused:  video.paused()
         onStopped: video.stopped()
+        onPlaying: video.playing()
+
+        onPlaybackStateChanged: video.playbackStateChanged()
     }
 
     /*!
         \qmlmethod Video::play()
 
         Starts playback of the media.
-
-        Sets the \l playing property to true, and the \l paused property to
-        false.
     */
     function play() {
         player.play();
@@ -317,8 +321,6 @@ Item {
         \qmlmethod Video::pause()
 
         Pauses playback of the media.
-
-        Sets the \l playing and \l paused properties to true.
     */
     function pause() {
         player.pause();
@@ -328,8 +330,6 @@ Item {
         \qmlmethod Video::stop()
 
         Stops playback of the media.
-
-        Sets the \l playing and \l paused properties to false.
     */
     function stop() {
         player.stop();