Use the device listener in Media on windows

media/audio/win/audio_device_listener_win.cc

Index: media/audio/win/audio_device_listener_win.cc
diff --git a/media/audio/win/audio_device_listener_win.cc b/media/audio/win/audio_device_listener_win.cc
index 9312af62cc78b7d3239a10d306c79a6468a74284..66644981c9a8174723e879b9aaee687624a5d5bf 100644
--- a/media/audio/win/audio_device_listener_win.cc
+++ b/media/audio/win/audio_device_listener_win.cc
@@ -7,6 +7,7 @@
 #include <Audioclient.h>
 
 #include "base/logging.h"
+#include "base/system_monitor/system_monitor.h"
 #include "base/utf_string_conversions.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/windows_version.h"
@@ -101,6 +102,13 @@ STDMETHODIMP AudioDeviceListenerWin::OnDeviceRemoved(LPCWSTR device_id) {
 
 STDMETHODIMP AudioDeviceListenerWin::OnDeviceStateChanged(LPCWSTR device_id,
                                                           DWORD new_state) {
+  if (new_state != DEVICE_STATE_ACTIVE && new_state != DEVICE_STATE_NOTPRESENT)
+    return S_OK;
+
+  base::SystemMonitor* monitor = base::SystemMonitor::Get();
+  if (monitor)
+    monitor->ProcessDevicesChanged(base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE);

[henrika (OOO until Aug 14), 2012/12/17 08:20:17]

How do you know that we are dealing with a capture device here?

+
   return S_OK;
 }