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diff --git a/src/multimedia/platform/windows/mediacapture/qwindowsmediadevicesession_p.h b/src/multimedia/platform/windows/mediacapture/qwindowsmediadevicesession_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINDOWSMEDIADEVICESESSION_H
+#define QWINDOWSMEDIADEVICESESSION_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <private/qtmultimediaglobal_p.h>
+#include <qcamera.h>
+#include <qmediaencodersettings.h>
+#include <qaudiodevice.h>
+#include <qwindowsmultimediautils_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QAudioInput;
+class QVideoSink;
+class QWindowsMediaDeviceReader;
+
+class QWindowsMediaDeviceSession : public QObject
+{
+    Q_OBJECT
+public:
+    explicit QWindowsMediaDeviceSession(QObject *parent = nullptr);
+    ~QWindowsMediaDeviceSession();
+
+    bool isActive() const;
+    void setActive(bool active);
+
+    bool isActivating() const;
+
+    void setActiveCamera(const QCameraDevice &camera);
+    QCameraDevice activeCamera() const;
+
+    void setCameraFormat(const QCameraFormat &cameraFormat);
+
+    void setVideoSink(QVideoSink *surface);
+
+    QMediaEncoderSettings videoSettings() const;
+    void setVideoSettings(const QMediaEncoderSettings &settings);
+
+public Q_SLOTS:
+    void setAudioInputMuted(bool muted);
+    void setAudioInputVolume(float volume);
+    void audioInputDeviceChanged();
+public:
+    void setAudioInput(QAudioInput *input);
+
+    bool startRecording(const QString &fileName, bool audioOnly);
+    void stopRecording();
+    bool pauseRecording();
+    bool resumeRecording();
+
+Q_SIGNALS:
+    void activeChanged(bool);
+    void readyForCaptureChanged(bool);
+    void durationChanged(qint64 duration);
+    void recordingStarted();
+    void recordingStopped();
+    void streamingError(int errorCode);
+    void newVideoFrame(const QVideoFrame &frame);
+
+private Q_SLOTS:
+    void handleStreamingStarted();
+    void handleStreamingStopped();
+    void handleStreamingError(int errorCode);
+    void handleNewVideoFrame(const QVideoFrame &frame);
+
+private:
+    quint32 estimateVideoBitRate(const GUID &videoFormat, quint32 width, quint32 height,
+                                qreal frameRate, QMediaEncoderSettings::Quality quality);
+    quint32 estimateAudioBitRate(const GUID &audioFormat, QMediaEncoderSettings::Quality quality);
+    bool m_active = false;
+    bool m_activating = false;
+    QCameraDevice m_activeCameraDevice;
+    QCameraFormat m_cameraFormat;
+    QWindowsMediaDeviceReader *m_mediaDeviceReader = nullptr;
+    QMediaEncoderSettings m_mediaEncoderSettings;
+    QAudioInput *m_audioInput = nullptr;
+    QVideoSink  *m_surface = nullptr;
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSMEDIADEVICESESSION_H