Qt 5.11 | Qt Multimedia | QML Video Example | Content.qml Example File

Qt 5.11.3 Reference Documentation

# Content.qml Example File

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

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the Qt Mobility Components.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, you may use this file under the terms of the BSD license
      ** as follows:
      **
      ** "Redistribution and use in source and binary forms, with or without
      ** modification, are permitted provided that the following conditions are
      ** met:
      **   * Redistributions of source code must retain the above copyright
      **     notice, this list of conditions and the following disclaimer.
      **   * Redistributions in binary form must reproduce the above copyright
      **     notice, this list of conditions and the following disclaimer in
      **     the documentation and/or other materials provided with the
      **     distribution.
      **   * Neither the name of The Qt Company Ltd nor the names of its
      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
      **
      **
      ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
      ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
      ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      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 }
      }