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diff --git a/src/plugins/wasapi/qwasapiutils.h b/src/plugins/wasapi/qwasapiutils.h
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index 000000000..ff2d915b6
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+++ b/src/plugins/wasapi/qwasapiutils.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd and/or its subsidiary(-ies).
+** 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 QWASAPIUTILS_H
+#define QWASAPIUTILS_H
+#include "qwasapiaudiodeviceinfo.h"
+#include "qwasapiaudioinput.h"
+#include "qwasapiaudiooutput.h"
+#include <QtCore/QLoggingCategory>
+#include <QtCore/QThread>
+#include <QtMultimedia/QAudio>
+#include <QtMultimedia/QAudioFormat>
+
+#include <wrl.h>
+#include <Audioclient.h>
+#include <mmdeviceapi.h>
+
+struct IAudioClient;
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcMmAudioInterface)
+Q_DECLARE_LOGGING_CATEGORY(lcMmUtils)
+
+#define EMIT_RETURN_FALSE_IF_FAILED(msg, err) \
+    if (FAILED(hr)) { \
+      m_currentError = err; \
+      emit errorChanged(m_currentError); \
+    } \
+    RETURN_FALSE_IF_FAILED(msg)
+
+#define EMIT_RETURN_VOID_IF_FAILED(msg, err) \
+    if (FAILED(hr)) { \
+      m_currentError = err; \
+      emit errorChanged(m_currentError); \
+    } \
+    RETURN_VOID_IF_FAILED(msg)
+
+class AudioInterface : public Microsoft::WRL::RuntimeClass<Microsoft::WRL::RuntimeClassFlags
+        <Microsoft::WRL::Delegate>, Microsoft::WRL::FtmBase, IActivateAudioInterfaceCompletionHandler>
+{
+public:
+    enum State {
+        Initialized = 0,
+        Activating,
+        Activated,
+        Error
+    } ;
+
+    explicit AudioInterface();
+
+    ~AudioInterface();
+
+    virtual HRESULT STDMETHODCALLTYPE ActivateCompleted(IActivateAudioInterfaceAsyncOperation *op);
+
+    inline State state() const { return m_currentState; }
+    void setState(State s) { m_currentState = s; }
+
+    Microsoft::WRL::ComPtr<IAudioClient> m_client;
+    QWasapiAudioDeviceInfo *m_parent;
+    State m_currentState;
+    QAudioFormat m_mixFormat;
+};
+
+class QWasapiProcessThread : public QThread
+{
+public:
+    explicit QWasapiProcessThread(QObject *item, bool output = true) : QThread(),
+        m_endpoint(item),
+        m_output(output)
+    {
+        qCDebug(lcMmUtils) << __FUNCTION__ << item;
+    }
+
+    ~QWasapiProcessThread()
+    {
+        qCDebug(lcMmUtils) << __FUNCTION__;
+        CloseHandle(m_event);
+    }
+
+    void run()
+    {
+        qCDebug(lcMmUtils) << __FUNCTION__ << m_endpoint;
+        if (m_output) {
+            QWasapiAudioOutput *output = static_cast<QWasapiAudioOutput *>(m_endpoint);
+            output->process();
+        } else {
+            QWasapiAudioInput *input = static_cast<QWasapiAudioInput *>(m_endpoint);
+            input->process();
+        }
+    }
+
+    HANDLE m_event;
+private:
+    QObject *m_endpoint;
+    bool m_output;
+};
+
+namespace QWasapiUtils
+{
+    bool convertToNativeFormat(const QAudioFormat &qt, WAVEFORMATEX *native);
+    bool convertFromNativeFormat(const WAVEFORMATEX *native, QAudioFormat *qt);
+
+    QList<QByteArray> availableDevices(QAudio::Mode mode);
+    Microsoft::WRL::ComPtr<AudioInterface> createOrGetInterface(const QByteArray &dev, QAudio::Mode mode);
+}
+
+QT_END_NAMESPACE
+
+#endif // QWASAPIUTILS_H