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