Add Track Selection from QML and updated example

Added Q_PROPERTY in QMediaPlayer.h for the obtaining track metadata and
for setting active track
Changed mediaplayer QML example to add track information and change.

Pick-to: 6.2
Change-Id: I1ff228a858079a87b1253d3c7a1ff24d815f2182
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 125 insertions, 0 deletions

diff --git a/examples/multimedia/video/mediaplayer/TracksInfo.qml b/examples/multimedia/video/mediaplayer/TracksInfo.qml
new file mode 100644
index 000000000..ad30a6beb
--- /dev/null
+++ b/examples/multimedia/video/mediaplayer/TracksInfo.qml
@@ -0,0 +1,125 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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
+import QtQuick.Controls
+import QtQuick.Layouts
+import QtMultimedia
+
+Item {
+    id: root
+    implicitWidth: 200
+
+    property int selectedTrack: 0
+
+    function read(metadataList) {
+        var LanguageKey = 6;
+
+        elements.clear()
+
+        elements.append(
+                    { language: "No Selected Track"
+                    , trackNumber: -1
+                    })
+
+        if (!metadataList)
+            return;
+
+        metadataList.forEach(function (metadata, index) {
+            var language = metadata.stringValue(LanguageKey);
+            if (!language)
+                return;
+
+            elements.append(
+                        { language: metadata.stringValue(LanguageKey)
+                        , trackNumber: index
+                        })
+        });
+    }
+
+    ListModel {
+        id: elements
+    }
+
+    Frame {
+        anchors.fill: parent
+        padding: 15
+
+        background: Rectangle {
+            color: "lightgray"
+            opacity: 0.7
+        }
+
+        ButtonGroup {id:group; }
+
+        ListView {
+            id: trackList
+            visible: elements.count > 0
+            anchors.fill: parent
+            model: elements
+            delegate: RowLayout {
+                width: trackList.width
+                RadioButton {
+                    property int trackIndex : index
+                    checked: trackIndex === selectedTrack +1
+                    text: model.language
+                    ButtonGroup.group: group
+                    onClicked: selectedTrack = model.trackNumber
+                }
+            }
+        }
+
+        Text {
+            id: metadataNoList
+            visible: elements.count === 0
+            text: qsTr("No tracks present")
+        }
+    }
+}