Fix audioengine example.

- Add missing audio files
- Fix 'Unable to assign double to QVector3D' warning
- Don't show decimal part of the volume

Task-number: QTBUG-41841
Task-number: QTBUG-44304
Change-Id: Ie24284242bbac0d10bd85841932c506d7634a514
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Christian Stromme <christian.stromme@theqtcompany.com>

examples/multimedia/audioengine/qml/audioengine.qml

@@ -65,7 +65,7 @@ Rectangle {
             loops: Animation.Infinite
             running: true
             NumberAnimation {
-            duration: 8000
+            duration: 12000
             from: 0
             to: 1
             }
@@ -113,7 +113,7 @@ Rectangle {
         }
         velocity: {
             var speed = root.twoPi * root.radius / 4;
-            return shipSound.direction * speed;
+            return shipSound.direction.times(speed);
         }
 
         Component.onCompleted: shipSound.play()
@@ -137,7 +137,7 @@ Rectangle {
             color: "lightgreen"
         }
         Text {
-            text: " volume:" + volumeBar.volumeCtrl.volume * 100 +"%";
+            text: " volume:" + Math.round(volumeBar.volumeCtrl.volume * 100) +"%";
             font.pointSize: 16;
             font.italic: true;
             color: "black"

examples/multimedia/audioengine/qml/content/MyAudioEngine.qml

@@ -68,22 +68,18 @@ AudioEngine {
     }
 
     AudioSample {
-        name:"fire"
+        name:"engine"
-        source: "fire-03-loop.wav"
+        source: "engine-loop.wav"
         preloaded:true
     }
 
     AudioSample {
-        name:"explosion"
+        name:"horn"
-        source: "explosion-02.wav"
+        source: "horn.wav"
     }
     AudioSample {
-        name:"lava"
+        name:"whistle"
-        source: "lava-bubbling-01.wav"
+        source: "whistle.wav"
-    }
-    AudioSample {
-        name:"water"
-        source: "running-water-01.wav"
     }
     Sound {
         name:"shipengine"
@@ -91,7 +87,7 @@ AudioEngine {
         category:"sfx"
         PlayVariation {
             looping:true
-            sample:"fire"
+            sample:"engine"
             maxGain:0.9
             minGain:0.8
         }
@@ -101,23 +97,14 @@ AudioEngine {
         name:"effects"
         category:"sfx"
         PlayVariation {
-            sample:"lava"
+            sample:"horn"
-            maxGain:1.5
+            maxGain:2.0
-            minGain:1.2
+            minGain:0.9
-            maxPitch:2.0
-            minPitch:0.5
         }
         PlayVariation {
-            sample:"explosion"
+            sample:"whistle"
-            maxGain:1.1
+            maxGain:1.0
-            minGain:0.7
+            minGain:0.8
-            maxPitch:1.5
-            minPitch:0.5
-        }
-        PlayVariation {
-            sample:"water"
-            maxGain:1.5
-            minGain:1.2
         }
     }