Qt 5.9 | Qt Multimedia | QML Video Example | Content.qml Example File

Qt 5.9.4 Reference Documentation

# Content.qml Example File

multimedia/video/qmlvideo/qml/qmlvideo/Content.qml

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      import QtQuick 2.0

      Rectangle {
          id: root
          border.color: "white"
          border.width: showBorder ? 1 : 0
          color: "transparent"
          property string contentType // "camera" or "video"
          property string source
          property real volume
          property bool dummy: false
          property bool autoStart: true
          property bool started: false
          property bool showFrameRate: false
          property bool showBorder: false

          signal initialized
          signal error
          signal videoFramePainted

          Loader {
              id: contentLoader
          }

          Connections {
              id: framePaintedConnection
              onFramePainted: {
                  if (frameRateLoader.item)
                      frameRateLoader.item.notify()
                  root.videoFramePainted()
              }
              ignoreUnknownSignals: true
          }

          Connections {
              id: errorConnection
              onFatalError: {
                  console.log("[qmlvideo] Content.onFatalError")
                  stop()
                  root.error()
              }
              ignoreUnknownSignals: true
          }

          Loader {
              id: frameRateLoader
              source: root.showFrameRate ? "../frequencymonitor/FrequencyItem.qml" : ""
              onLoaded: {
                  item.parent = root
                  item.anchors.top = root.top
                  item.anchors.right = root.right
                  item.anchors.margins = 10
              }
          }

          onWidthChanged: {
              if (contentItem())
                  contentItem().width = width
          }

          onHeightChanged: {
              if (contentItem())
                  contentItem().height = height
          }

          function initialize() {
              if ("video" == contentType) {
                  contentLoader.source = "VideoItem.qml"
                  if (Loader.Error == contentLoader.status) {
                      contentLoader.source = "VideoDummy.qml"
                      dummy = true
                  }
                  contentLoader.item.volume = volume
              } else if ("camera" == contentType) {
                  contentLoader.source = "CameraItem.qml"
                  if (Loader.Error == contentLoader.status) {
                      contentLoader.source = "CameraDummy.qml"
                      dummy = true
                  }
              } else {
                  console.log("[qmlvideo] Content.initialize: error: invalid contentType")
              }
              if (contentLoader.item) {
                  contentLoader.item.sizeChanged.connect(updateRootSize)
                  contentLoader.item.parent = root
                  contentLoader.item.width = root.width
                  framePaintedConnection.target = contentLoader.item
                  errorConnection.target = contentLoader.item
                  if (root.autoStart)
                      root.start()
              }
              root.initialized()
          }

          function start() {
              if (contentLoader.item) {
                  if (root.contentType == "video")
                      contentLoader.item.mediaSource = root.source
                  contentLoader.item.start()
                  root.started = true
              }
          }

          function stop() {
              if (contentLoader.item) {
                  contentLoader.item.stop()
                  if (root.contentType == "video")
                      contentLoader.item.mediaSource = ""
                  root.started = false
              }
          }

          function contentItem() { return contentLoader.item }
          function updateRootSize() { root.height = contentItem().height }
      }