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diff --git a/src/multimedia/platform/darwin/audio/avfaudiodecoder_p.h b/src/multimedia/platform/darwin/audio/avfaudiodecoder_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 AVFAUDIODECODER_H
+#define AVFAUDIODECODER_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 <QtMultimedia/private/qtmultimediaglobal_p.h>
+#include <QObject>
+#include <QtCore/qurl.h>
+
+#include "private/qplatformaudiodecoder_p.h"
+#include "qaudiodecoder.h"
+
+#include <dispatch/dispatch.h>
+
+Q_FORWARD_DECLARE_OBJC_CLASS(AVURLAsset);
+Q_FORWARD_DECLARE_OBJC_CLASS(AVAssetReader);
+Q_FORWARD_DECLARE_OBJC_CLASS(AVAssetReaderTrackOutput);
+Q_FORWARD_DECLARE_OBJC_CLASS(AVFResourceReaderDelegate);
+
+QT_BEGIN_NAMESPACE
+
+class AVFAudioDecoder : public QPlatformAudioDecoder
+{
+    Q_OBJECT
+
+public:
+    AVFAudioDecoder(QAudioDecoder *parent);
+    virtual ~AVFAudioDecoder();
+
+    // QAudioDecoder interface
+    QAudioDecoder::State state() const override { return m_state; }
+
+    QUrl source() const override;
+    void setSource(const QUrl &fileName) override;
+
+    QIODevice *sourceDevice() const override;
+    void setSourceDevice(QIODevice *device) override;
+
+    void start() override;
+    void stop() override;
+
+    QAudioFormat audioFormat() const override;
+    void setAudioFormat(const QAudioFormat &format) override;
+
+    QAudioBuffer read() override;
+    bool bufferAvailable() const override;
+
+    qint64 position() const override;
+    qint64 duration() const override;
+
+private slots:
+    void handleNewAudioBuffer(QAudioBuffer);
+    void startReading();
+
+signals:
+    void newAudioBuffer(QAudioBuffer);
+    void readyToRead();
+
+private:
+    void processInvalidMedia(QAudioDecoder::Error errorCode, const QString& errorString);
+    void initAssetReader();
+
+    QAudioDecoder::State m_state = QAudioDecoder::StoppedState;
+    QAudioDecoder::State m_pendingState = QAudioDecoder::StoppedState;
+
+    QUrl m_source;
+    QIODevice *m_device = nullptr;
+    QAudioFormat m_format;
+
+    int m_buffersAvailable = 0;
+    QList<QAudioBuffer> m_cachedBuffers;
+
+    qint64 m_position = -1;
+    qint64 m_duration = -1;
+
+    bool m_loadingSource = false;
+
+    AVURLAsset *m_asset = nullptr;
+    AVAssetReader *m_reader = nullptr;
+    AVAssetReaderTrackOutput *m_readerOutput = nullptr;
+    AVFResourceReaderDelegate *m_readerDelegate = nullptr;
+    dispatch_queue_t m_readingQueue;
+    dispatch_queue_t m_decodingQueue;
+};
+
+QT_END_NAMESPACE
+
+#endif // AVFAUDIODECODER_H