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// 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 <wrl/client.h>
#include <memory>
#include <string>
#include "base/callback.h"
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "media/base/media_export.h"
namespace base {
class TickClock;
}
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_cb| is a permanent callback
// and must outlive AudioDeviceListenerWin.
explicit AudioDeviceListenerWin(base::RepeatingClosure listener_cb);
AudioDeviceListenerWin(const AudioDeviceListenerWin&) = delete;
AudioDeviceListenerWin& operator=(const AudioDeviceListenerWin&) = delete;
virtual ~AudioDeviceListenerWin();
private:
friend class AudioDeviceListenerWinTest;
// Minimum allowed time between device change notifications.
static constexpr base::TimeDelta kDeviceChangeLimit = base::Milliseconds(250);
// IMMNotificationClient implementation.
IFACEMETHODIMP_(ULONG) AddRef() override;
IFACEMETHODIMP_(ULONG) Release() override;
IFACEMETHODIMP QueryInterface(REFIID iid, void** object) override;
IFACEMETHODIMP OnPropertyValueChanged(LPCWSTR device_id,
const PROPERTYKEY key) override;
IFACEMETHODIMP OnDeviceAdded(LPCWSTR device_id) override;
IFACEMETHODIMP OnDeviceRemoved(LPCWSTR device_id) override;
IFACEMETHODIMP OnDeviceStateChanged(LPCWSTR device_id,
DWORD new_state) override;
IFACEMETHODIMP OnDefaultDeviceChanged(EDataFlow flow,
ERole role,
LPCWSTR new_default_device_id) override;
const base::RepeatingClosure listener_cb_;
Microsoft::WRL::ComPtr<IMMDeviceEnumerator> device_enumerator_;
// Used to rate limit device change events.
base::TimeTicks last_device_change_time_;
std::string last_device_id_;
// AudioDeviceListenerWin must be constructed and destructed on one thread.
THREAD_CHECKER(thread_checker_);
const base::TickClock* tick_clock_;
};
} // namespace media
#endif // MEDIA_AUDIO_WIN_AUDIO_DEVICE_LISTENER_WIN_H_
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