Index: remoting/host/win/default_audio_device_change_detector.h |
diff --git a/remoting/host/win/default_audio_device_change_detector.h b/remoting/host/win/default_audio_device_change_detector.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..099158fbe9266a32829491528bbd4a9b44dec253 |
--- /dev/null |
+++ b/remoting/host/win/default_audio_device_change_detector.h |
@@ -0,0 +1,53 @@ |
+// Copyright 2017 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. |
+ |
+#ifndef REMOTING_HOST_WIN_DEFAULT_AUDIO_DEVICE_CHANGE_DETECTOR_H_ |
+#define REMOTING_HOST_WIN_DEFAULT_AUDIO_DEVICE_CHANGE_DETECTOR_H_ |
+ |
+#include <mmdeviceapi.h> |
+ |
+#include "base/synchronization/lock.h" |
+#include "base/win/scoped_comptr.h" |
+ |
+namespace remoting { |
+ |
+// An IMMNotificationClient implementation to detect the change of the default |
+// audio output device on the system. It registers itself into the input |
+// IMMDeviceEnumerator in constructor, and unregisters in destructor. |
joedow
2017/04/24 17:29:41
nit: remove comma
Hzj_jie
2017/04/24 22:45:02
Done.
|
+// This class does not use the default referring memory management method |
joedow
2017/04/24 17:29:41
s/referring/ref-counting
Hzj_jie
2017/04/24 22:45:02
Done.
|
+// provided by IUnknown: calling DefaultAudioDeviceChangeDetector::Release() |
+// won't delete the object. |
+class DefaultAudioDeviceChangeDetector final : public IMMNotificationClient { |
+ public: |
+ DefaultAudioDeviceChangeDetector( |
+ const base::win::ScopedComPtr<IMMDeviceEnumerator>& enumerator); |
joedow
2017/04/24 17:29:41
single param c'tors should be marked explicit
Hzj_jie
2017/04/24 22:45:02
Done.
|
+ ~DefaultAudioDeviceChangeDetector(); |
joedow
2017/04/24 17:29:41
override?
Hzj_jie
2017/04/24 22:45:02
e:\b\c\b\win\src\remoting\host\win\default_audio_d
|
+ |
+ bool GetAndReset(); |
+ |
+ private: |
+ HRESULT __stdcall OnDefaultDeviceChanged(EDataFlow flow, |
+ ERole role, |
+ LPCWSTR pwstrDefaultDevice) override; |
+ |
+ HRESULT __stdcall QueryInterface(REFIID iid, void** object) override; |
+ |
+ // No-ops overrides. |
joedow
2017/04/24 17:29:41
I wouldn't call out the no-op bit here, just docum
Hzj_jie
2017/04/24 22:45:02
I think both comments should be useful here. No-op
|
+ HRESULT __stdcall OnDeviceAdded(LPCWSTR pwstrDeviceId) override; |
+ HRESULT __stdcall OnDeviceRemoved(LPCWSTR pwstrDeviceId) override; |
+ HRESULT __stdcall OnDeviceStateChanged(LPCWSTR pwstrDeviceId, |
+ DWORD dwNewState) override; |
+ HRESULT __stdcall OnPropertyValueChanged(LPCWSTR pwstrDeviceId, |
+ const PROPERTYKEY key) override; |
+ ULONG __stdcall AddRef() override; |
+ ULONG __stdcall Release() override; |
+ |
+ const base::win::ScopedComPtr<IMMDeviceEnumerator> enumerator_; |
+ bool changed_ = false; |
+ base::Lock lock_; |
+}; |
+ |
+} // namespace remoting |
+ |
+#endif // REMOTING_HOST_WIN_DEFAULT_AUDIO_DEVICE_CHANGE_DETECTOR_H_ |