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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_GLOBAL_MEDIA_CONTROLS_MEDIA_NOTIFICATION_DEVICE_MONITOR_H_
#define CHROME_BROWSER_UI_GLOBAL_MEDIA_CONTROLS_MEDIA_NOTIFICATION_DEVICE_MONITOR_H_
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "base/system/system_monitor.h"
#include "build/build_config.h"
#include "media/audio/audio_device_description.h"
class MediaNotificationDeviceProvider;
namespace base {
class SingleThreadTaskRunner;
} // namespace base
// Common interface for a class that detects changes in the audio output devices
// connected to the system and notifies observers.
class MediaNotificationDeviceMonitor {
public:
virtual ~MediaNotificationDeviceMonitor();
// Returns a pointer to the appropriate implementation for the OS.
static std::unique_ptr<MediaNotificationDeviceMonitor> Create(
MediaNotificationDeviceProvider* device_provider);
class DevicesChangedObserver : public base::CheckedObserver {
public:
// Called when the MediaNotificationDeviceMonitor detects a change in the
// connected audio output devices.
virtual void OnDevicesChanged() = 0;
};
void AddDevicesChangedObserver(DevicesChangedObserver* obs);
void RemoveDevicesChangedObserver(DevicesChangedObserver* obs);
virtual void StartMonitoring() = 0;
virtual void StopMonitoring() = 0;
protected:
bool is_monitoring_ = false;
MediaNotificationDeviceMonitor();
base::ObserverList<DevicesChangedObserver> observers_;
};
#if !((BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)) && defined(USE_UDEV))
// Monitors device changes by observing the SystemMonitor
class SystemMonitorDeviceMonitorImpl
: public MediaNotificationDeviceMonitor,
public base::SystemMonitor::DevicesChangedObserver {
public:
SystemMonitorDeviceMonitorImpl();
~SystemMonitorDeviceMonitorImpl() override;
void StartMonitoring() override;
void StopMonitoring() override;
void OnDevicesChanged(base::SystemMonitor::DeviceType device_type) override;
};
#else
// Monitors device changes by polling the MediaNotificationDeviceProvider
class PollingDeviceMonitorImpl : public MediaNotificationDeviceMonitor {
public:
explicit PollingDeviceMonitorImpl(
MediaNotificationDeviceProvider* device_provider);
~PollingDeviceMonitorImpl() override;
void StartMonitoring() override;
void StopMonitoring() override;
static int get_polling_interval_for_testing();
private:
FRIEND_TEST_ALL_PREFIXES(PollingDeviceMonitorImplTest,
DeviceChangeNotifiesObserver);
void PollDeviceProvider();
void OnDeviceDescriptionsRecieved(
media::AudioDeviceDescriptions descriptions);
void NotifyObservers();
const raw_ptr<MediaNotificationDeviceProvider> device_provider_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
std::vector<std::string> device_ids_;
bool is_task_posted_ = false;
base::WeakPtrFactory<PollingDeviceMonitorImpl> weak_ptr_factory_{this};
};
#endif // !((BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)) &&
// defined(USE_UDEV))
#endif // CHROME_BROWSER_UI_GLOBAL_MEDIA_CONTROLS_MEDIA_NOTIFICATION_DEVICE_MONITOR_H_
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