Qt 5.7 | Qt Multimedia | QML Video Shader Effects Example | Content.qml Example File

Qt 5.7.1 Reference Documentation

# Content.qml Example File

multimedia/video/qmlvideofx/qml/qmlvideofx/Content.qml

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      import QtQuick 2.1

      Rectangle {
          id: root
          property alias effect: effectLoader.item
          property alias gripSize: divider.gripSize
          property string effectSource
          property real volume: 0.5

          signal videoFramePainted

          Divider {
              id: divider
              visible: false
              z: 1.0
              onValueChanged: updateDivider()
          }

          ShaderEffectSource {
              id: theSource
              smooth: true
              hideSource: true
          }

          Loader {
              id: contentLoader
          }

          Loader {
              id: effectLoader
              source: effectSource
          }

          Connections {
              id: videoFramePaintedConnection
              onFramePainted: {
                  if (performanceLoader.item)
                     root.videoFramePainted()
              }
              ignoreUnknownSignals: true
          }

          onWidthChanged: {
              if (effectLoader.item)
                  effectLoader.item.targetWidth = root.width
          }

          onHeightChanged: {
              if (effectLoader.item)
                  effectLoader.item.targetHeight = root.height
          }

          onEffectSourceChanged: {
              effectLoader.source = effectSource
              effectLoader.item.parent = root
              effectLoader.item.targetWidth = root.width
              effectLoader.item.targetHeight = root.height
              updateSource()
              effectLoader.item.source = theSource
              divider.visible = effectLoader.item.divider
              updateDivider()
          }

          function init() {
              openImage("qrc:/images/qt-logo.png")
              root.effectSource = "EffectPassThrough.qml"
          }

          function updateDivider() {
              if (effectLoader.item && effectLoader.item.divider)
                  effectLoader.item.dividerValue = divider.value
          }

          function updateSource() {
              if (contentLoader.item) {
                  contentLoader.item.parent = root
                  contentLoader.item.anchors.fill = root
                  theSource.sourceItem = contentLoader.item
                  if (effectLoader.item)
                      effectLoader.item.anchors.fill = contentLoader.item
              }
          }

          function openImage(path) {
              stop()
              contentLoader.source = "ContentImage.qml"
              videoFramePaintedConnection.target = null
              contentLoader.item.source = path
              updateSource()
          }

          function openVideo(path) {
              stop()
              contentLoader.source = "ContentVideo.qml"
              videoFramePaintedConnection.target = contentLoader.item
              contentLoader.item.mediaSource = path
              contentLoader.item.volume = volume
              contentLoader.item.play()
              updateSource()
          }

          function openCamera() {
              stop()
              contentLoader.source = "ContentCamera.qml"
              videoFramePaintedConnection.target = contentLoader.item
              updateSource()
          }

          function stop() {
              if (contentLoader.source == "ContentVideo.qml")
                  contentLoader.item.stop()
              theSource.sourceItem = null
          }
      }