main.qml Example File | Qt 3D 5.12.10

- Qt 5.12
- Qt 3D
- Qt 3D: Audio Visualizer Example
- main.qml Example File
- Qt 5.12.10 Reference Documentation

# 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"
                 }
             }
         }
     }