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diff --git a/src/plugins/wmf/player/samplegrabber.h b/src/plugins/wmf/player/samplegrabber.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 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 SAMPLEGRABBER_H
+#define SAMPLEGRABBER_H
+
+#include <QtCore/qmutex.h>
+#include <QtCore/qlist.h>
+#include <QtMultimedia/qaudioformat.h>
+#include <mfapi.h>
+#include <mfidl.h>
+
+class MFAudioProbeControl;
+
+class SampleGrabberCallback : public IMFSampleGrabberSinkCallback
+{
+public:
+    // IUnknown methods
+    STDMETHODIMP QueryInterface(REFIID iid, void** ppv);
+    STDMETHODIMP_(ULONG) AddRef();
+    STDMETHODIMP_(ULONG) Release();
+
+    // IMFClockStateSink methods
+    STDMETHODIMP OnClockStart(MFTIME hnsSystemTime, LONGLONG llClockStartOffset);
+    STDMETHODIMP OnClockStop(MFTIME hnsSystemTime);
+    STDMETHODIMP OnClockPause(MFTIME hnsSystemTime);
+    STDMETHODIMP OnClockRestart(MFTIME hnsSystemTime);
+    STDMETHODIMP OnClockSetRate(MFTIME hnsSystemTime, float flRate);
+
+    // IMFSampleGrabberSinkCallback methods
+    STDMETHODIMP OnSetPresentationClock(IMFPresentationClock* pClock);
+    STDMETHODIMP OnShutdown();
+
+protected:
+    SampleGrabberCallback() : m_cRef(1) {}
+
+public:
+    virtual ~SampleGrabberCallback() {}
+
+private:
+    long m_cRef;
+};
+
+class AudioSampleGrabberCallback: public SampleGrabberCallback {
+public:
+    void addProbe(MFAudioProbeControl* probe);
+    void removeProbe(MFAudioProbeControl* probe);
+    void setFormat(const QAudioFormat& format);
+
+    STDMETHODIMP OnProcessSample(REFGUID guidMajorMediaType, DWORD dwSampleFlags,
+        LONGLONG llSampleTime, LONGLONG llSampleDuration, const BYTE * pSampleBuffer,
+        DWORD dwSampleSize);
+
+private:
+    QList<MFAudioProbeControl*> m_audioProbes;
+    QMutex m_audioProbeMutex;
+    QAudioFormat m_format;
+};
+
+#endif // SAMPLEGRABBER_H