Content.qml Example File

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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 }
  }