blob: 6a312519af91b6dcaf4a3411658a040eb1c9aa71 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_
#define MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_
#include <MMDeviceAPI.h>
#include <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/threading/thread_checker.h"
#include "base/win/scoped_comptr.h"
#include "media/base/media_export.h"
using base::win::ScopedComPtr;
namespace media {
// IMMNotificationClient implementation for listening for default device changes
// and forwarding to AudioManagerWin so it can notify downstream clients. Only
// output (eRender) device changes are supported currently. Core Audio support
// is required to construct this object. Must be constructed and destructed on
// a single COM initialized thread.
// TODO(dalecurtis, henrika): Support input device changes.
class MEDIA_EXPORT AudioDeviceListenerWin : public IMMNotificationClient {
public:
// The listener callback will be called from a system level multimedia thread,
// thus the callee must be thread safe. |listener| is a permanent callback
// and must outlive AudioDeviceListenerWin.
explicit AudioDeviceListenerWin(const base::Closure& listener_cb);
virtual ~AudioDeviceListenerWin();
private:
friend class AudioDeviceListenerWinTest;
// IMMNotificationClient implementation.
STDMETHOD_(ULONG, AddRef)();
STDMETHOD_(ULONG, Release)();
STDMETHOD(QueryInterface)(REFIID iid, void** object);
STDMETHOD(OnPropertyValueChanged)(LPCWSTR device_id, const PROPERTYKEY key);
STDMETHOD(OnDeviceAdded)(LPCWSTR device_id);
STDMETHOD(OnDeviceRemoved)(LPCWSTR device_id);
STDMETHOD(OnDeviceStateChanged)(LPCWSTR device_id, DWORD new_state);
STDMETHOD(OnDefaultDeviceChanged)(EDataFlow flow, ERole role,
LPCWSTR new_default_device_id);
base::Closure listener_cb_;
ScopedComPtr<IMMDeviceEnumerator> device_enumerator_;
std::string default_render_device_id_;
// AudioDeviceListenerWin must be constructed and destructed on one thread.
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(AudioDeviceListenerWin);
};
} // namespace media
#endif // MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_