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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 
     11 namespace {
     12 class DeviceMonitorMacImpl;
     13 }
     14 
     15 namespace content {
     16 
     17 // Class to track audio/video devices removal or addition via callback to
     18 // base::SystemMonitor ProcessDevicesChanged(). A single object of this class
     19 // is created from the browser main process and lives as long as this one.
     20 class DeviceMonitorMac {
     21  public:
     22   DeviceMonitorMac();
     23   ~DeviceMonitorMac();
     24 
     25   // Method called by the internal DeviceMonitorMacImpl object
     26   // |device_monitor_impl_| when a device of type |type| has been added to or
     27   // removed from the system. This code executes in the notification thread
     28   // (QTKit or AVFoundation).
     29   void NotifyDeviceChanged(base::SystemMonitor::DeviceType type);
     30 
     31  private:
     32   scoped_ptr<DeviceMonitorMacImpl> device_monitor_impl_;
     33 
     34   DISALLOW_COPY_AND_ASSIGN(DeviceMonitorMac);
     35 };
     36 
     37 }  // namespace content
     38 
     39 #endif  // CONTENT_BROWSER_DEVICE_MONITOR_MAC_H_
     40