main.qml Example File

audio-visualizer-qml/main.qml 
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 import QtQuick 2.0
 import QtQuick.Scene3D 2.0
 import QtQuick.Layouts 1.2
 import QtMultimedia 5.0

 Item {
     id: mainview
     width: 1215
     height: 720
     visible: true
     property bool isHoverEnabled: false

     property variant magnitudeArray: null
     property int millisecondsPerBar: 68
     property string magnitudeDataSourceFile: "qrc:/music/visualization.raw"
     property int mediaLatencyOffset: 68

     state: "stopped"
     states: [
         State {
             name: "playing"
             PropertyChanges {
                 target: playButtonImage
                 source: {
                     if (playButtonMouseArea.containsMouse)
                         "qrc:/images/pausehoverpressed.png"
                     else
                         "qrc:/images/pausenormal.png"
                 }
             }
             PropertyChanges {
                 target: stopButtonImage
                 source: "qrc:/images/stopnormal.png"
             }
         },
         State {
             name: "paused"
             PropertyChanges {
                 target: playButtonImage
                 source: {
                     if (playButtonMouseArea.containsMouse)
                         "qrc:/images/playhoverpressed.png"
                     else
                         "qrc:/images/playnormal.png"
                 }
             }
             PropertyChanges {
                 target: stopButtonImage
                 source: "qrc:/images/stopnormal.png"
             }
         },
         State {
             name: "stopped"
             PropertyChanges {
                 target: playButtonImage
                 source: "qrc:/images/playnormal.png"
             }
             PropertyChanges {
                 target: stopButtonImage
                 source: "qrc:/images/stopdisabled.png"
             }
         }
     ]

     Component.onCompleted: isHoverEnabled = touchSettings.isHoverEnabled()

     MediaPlayer {
         id: mediaPlayer
         autoPlay: true
         volume: 0.5
         source: "qrc:/music/tiltshifted_lost_neon_sun.mp3"

         onStatusChanged: {
             if (status == MediaPlayer.EndOfMedia) //{
                 state = "stopped"
         }

         onError: console.error("error with audio " + mediaPlayer.error)

         onDurationChanged: {
             // Load the pre-calculated magnitude data for the visualizer
             var request = new XMLHttpRequest()
             request.responseType = 'arraybuffer'
             request.onreadystatechange = function() {
                     if (request.readyState === XMLHttpRequest.DONE) {
                         if (request.status == 200 || request.status == 0) {
                             var arrayBuffer = request.response
                             if (arrayBuffer) {
                                 magnitudeArray = new Uint16Array(arrayBuffer)
                                 visualizer.startVisualization()
                               }
                         } else {
                             console.warn("Couldn't load magnitude data for bars.")
                         }
                         request = null
                     }
                 };

             request.open('GET', magnitudeDataSourceFile, true)
             request.send(null)
         }

         function getNextAudioLevel(offsetMs) {
             if (magnitudeArray === null)
                 return 0.0;

             // Calculate the integer index position in to the magnitude array
             var index = ((mediaPlayer.position + offsetMs) /
                          mainview.millisecondsPerBar) | 0;

             if (index < 0 || index >= magnitudeArray.length)
                 return 0.0;

             return (magnitudeArray[index] / 63274.0);
         }
     }

     Image {
         id: coverImage
         anchors.fill: parent
         source: "qrc:/images/albumcover.png"
     }

     Scene3D {
         anchors.fill: parent

         Visualizer {
             id: visualizer
             animationState: mainview.state
             numberOfBars: 120
             barRotationTimeMs: 8160 // 68 ms per bar
         }
     }

     Rectangle {
         id: blackBottomRect
         color: "black"
         width: parent.width
         height: 0.14 * mainview.height
         anchors.bottom: parent.bottom
     }

     // Duration of played content
     Text {
         text: formatDuration(mediaPlayer.position)
         color: "#80C342"
         x: parent.width / 6
         y: mainview.height - mainview.height / 8
         font.pixelSize: 12
     }

     // Duration of the content left
     Text {
         text: "-" + formatDuration(mediaPlayer.duration - mediaPlayer.position)
         color: "#80C342"
         x: parent.width - parent.width / 6
         y: mainview.height - mainview.height / 8
         font.pixelSize: 12
     }

     function formatDuration(milliseconds) {
         var minutes = Math.floor(milliseconds / 60000)
         milliseconds -= minutes * 60000
         var seconds = milliseconds / 1000
         seconds = Math.round(seconds)
         if (seconds < 10)
             return minutes + ":0" + seconds
         else
             return minutes + ":" + seconds
     }

     property int buttonHorizontalMargin: 10
     Rectangle {
         id: playButton
         height: 54
         width: 54
         anchors.bottom: parent.bottom
         anchors.bottomMargin: width
         x: parent.width / 2 - width - buttonHorizontalMargin
         color: "transparent"

         Image {
             id: playButtonImage
             source: "qrc:/images/pausenormal.png"
         }

         MouseArea {
             id: playButtonMouseArea
             anchors.fill: parent
             hoverEnabled: isHoverEnabled
             onClicked: {
                 if (mainview.state == 'paused' || mainview.state == 'stopped')
                     mainview.state = 'playing'
                 else
                     mainview.state = 'paused'
             }
             onEntered: {
                 if (mainview.state == 'playing')
                     playButtonImage.source = "qrc:/images/pausehoverpressed.png"
                 else
                     playButtonImage.source = "qrc:/images/playhoverpressed.png"
             }
             onExited: {
                 if (mainview.state == 'playing')
                     playButtonImage.source = "qrc:/images/pausenormal.png"
                 else
                     playButtonImage.source = "qrc:/images/playnormal.png"
             }
         }
     }

     Rectangle {
         id: stopButton
         height: 54
         width: 54
         anchors.bottom: parent.bottom
         anchors.bottomMargin: width
         x: parent.width / 2 + buttonHorizontalMargin
         color: "transparent"

         Image {
             id: stopButtonImage
             source: "qrc:/images/stopnormal.png"
         }

         MouseArea {
             anchors.fill: parent
             hoverEnabled: isHoverEnabled
             onClicked: mainview.state = 'stopped'
             onEntered: {
                 if (mainview.state != 'stopped')
                     stopButtonImage.source = "qrc:/images/stophoverpressed.png"
             }
             onExited: {
                 if (mainview.state != 'stopped')
                     stopButtonImage.source = "qrc:/images/stopnormal.png"
             }
         }
     }
 }

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