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diff --git a/src/VBox/Main/include/AudioSettingsImpl.h b/src/VBox/Main/include/AudioSettingsImpl.h
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+/* $Id: AudioSettingsImpl.h $ */
+
+/** @file
+ *
+ * VirtualBox COM class implementation
+ */
+
+/*
+ * Copyright (C) 2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_AudioSettingsImpl_h
+#define MAIN_INCLUDED_AudioSettingsImpl_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "AudioAdapterImpl.h"
+#include "GuestOSTypeImpl.h"
+
+#include "AudioSettingsWrap.h"
+namespace settings
+{
+ struct AudioSettings;
+}
+
+class ATL_NO_VTABLE AudioSettings :
+ public AudioSettingsWrap
+{
+public:
+
+ DECLARE_COMMON_CLASS_METHODS(AudioSettings)
+
+ HRESULT FinalConstruct();
+ void FinalRelease();
+
+ // public initializer/uninitializer for internal purposes only
+ HRESULT init(Machine *aParent);
+ HRESULT init(Machine *aParent, AudioSettings *aThat);
+ HRESULT initCopy(Machine *aParent, AudioSettings *aThat);
+ void uninit();
+
+ HRESULT getHostAudioDevice(AudioDirection_T aUsage, ComPtr<IHostAudioDevice> &aDevice);
+ HRESULT setHostAudioDevice(const ComPtr<IHostAudioDevice> &aDevice, AudioDirection_T aUsage);
+ HRESULT getAdapter(ComPtr<IAudioAdapter> &aAdapter);
+
+ // public methods only for internal purposes
+ bool i_canChangeSettings(void);
+ void i_onAdapterChanged(IAudioAdapter *pAdapter);
+ void i_onHostDeviceChanged(IHostAudioDevice *pDevice, bool fIsNew, AudioDeviceState_T enmState, IVirtualBoxErrorInfo *pErrInfo);
+ void i_onSettingsChanged(void);
+ HRESULT i_loadSettings(const settings::AudioAdapter &data);
+ HRESULT i_saveSettings(settings::AudioAdapter &data);
+ void i_copyFrom(AudioSettings *aThat);
+ HRESULT i_applyDefaults(ComObjPtr<GuestOSType> &aGuestOsType);
+
+ void i_rollback();
+ void i_commit();
+
+private:
+
+ struct Data;
+ Data *m;
+};
+#endif /* !MAIN_INCLUDED_AudioSettingsImpl_h */
+