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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
      6 #define CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/system_monitor/system_monitor.h"
     10 #include "base/threading/thread_checker.h"
     11 
     12 namespace {
     13 class DeviceMonitorMacImpl;
     14 }
     15 
     16 namespace content {
     17 
     18 // Class to track audio/video devices removal or addition via callback to
     19 // base::SystemMonitor ProcessDevicesChanged(). A single object of this class
     20 // is created from the browser main process and lives as long as this one.
     21 class DeviceMonitorMac {
     22  public:
     23   DeviceMonitorMac();
     24   ~DeviceMonitorMac();
     25 
     26   // Registers the observers for the audio/video device removal, connection and
     27   // suspension. The AVFoundation library is also loaded and initialised if the
     28   // OS supports it. The |device_task_runner| argument represents the thread on
     29   // which device enumeration will occur.
     30   void StartMonitoring(
     31     const scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner);
     32 
     33   // Method called by the internal DeviceMonitorMacImpl object
     34   // |device_monitor_impl_| when a device of type |type| has been added to or
     35   // removed from the system. This code executes in the notification thread
     36   // (QTKit or AVFoundation).
     37   void NotifyDeviceChanged(base::SystemMonitor::DeviceType type);
     38 
     39  private:
     40   scoped_ptr<DeviceMonitorMacImpl> device_monitor_impl_;
     41 
     42   // |thread_checker_| is used to check that constructor and StartMonitoring()
     43   // are called in the correct thread, the UI thread, that also owns the object.
     44   base::ThreadChecker thread_checker_;
     45 
     46   DISALLOW_COPY_AND_ASSIGN(DeviceMonitorMac);
     47 };
     48 
     49 }  // namespace content
     50 
     51 #endif  // CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
     52