blob: 136bb7df19556ad3c299bb907e34fdb46355a9c7 [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.
#include <memory>
#include "base/macros.h"
#include "base/system_monitor/system_monitor.h"
#include "base/threading/thread_checker.h"
#include "media/base/media_export.h"
namespace {
class DeviceMonitorMacImpl;
namespace media {
// Class to track audio/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 {
// Registers the observers for the audio/video device removal, connection and
// suspension. The AVFoundation library is also loaded and initialised if the
// OS supports it. The |device_task_runner| argument represents the thread on
// which device enumeration will occur.
void StartMonitoring(
const scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner);
// 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);
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 content