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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.
#include <memory>
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/system/system_monitor.h"
#include "base/threading/thread_checker.h"
#include "media/base/media_export.h"
namespace {
class DeviceMonitorMacImpl;
namespace media {
// Class to track video devices removal or addition via callback to
// base::SystemMonitor ProcessDevicesChanged(). A single object of this class
// is created from the browser main process and lives as long as this one.
class MEDIA_EXPORT DeviceMonitorMac {
// The |device_task_runner| argument represents the thread on which device
// enumeration will occur.
explicit DeviceMonitorMac(
scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
// Registers the observers for the video device removal, connection and
// suspension. The AVFoundation library is also loaded and initialised if the
// OS supports it.
void StartMonitoring();
// Method called by the internal DeviceMonitorMacImpl object
// |device_monitor_impl_| when a device of type |type| has been added to or
// removed from the system. This code executes in the notification thread.
void NotifyDeviceChanged(base::SystemMonitor::DeviceType type);
scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
std::unique_ptr<DeviceMonitorMacImpl> device_monitor_impl_;
// |thread_checker_| is used to check that constructor and StartMonitoring()
// are called in the correct thread, the UI thread, that also owns the object.
base::ThreadChecker thread_checker_;
} // namespace media