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Side by Side Diff: media/capture/device_monitor_mac.h

Issue 2224643002: Move device monitors out of //media/capture into //media/device_monitors (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 4 months ago
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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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