Handle audio device changes on Windows.

media/audio/win/audio_low_latency_output_win.h

 // Copyright (c) 2012 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.
 
 // Implementation of AudioOutputStream for Windows using Windows Core Audio
 // WASAPI for low latency rendering.
 //
 // Overview of operation and performance:
 //
 // - An object of WASAPIAudioOutputStream is created by the AudioManager
@@ skipping 140 matching lines @@
 #include "base/win/scoped_handle.h"
 #include "media/audio/audio_io.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class AudioManagerWin;
 
 // AudioOutputStream implementation using Windows Core Audio APIs.
-// The IMMNotificationClient interface enables device event notifications
-// related to changes in the status of an audio endpoint device.
+// TODO(henrika): Remove IMMNotificationClient implementation now that we have
+// AudioDeviceListenerWin; currently just disabled since extraction is tricky.
 class MEDIA_EXPORT WASAPIAudioOutputStream
     : public IMMNotificationClient,
       public AudioOutputStream,
       public base::DelegateSimpleThread::Delegate {
  public:
   // The ctor takes all the usual parameters, plus |manager| which is the
   // the audio manager who is creating this object.
   WASAPIAudioOutputStream(AudioManagerWin* manager,
                           const AudioParameters& params,
                           ERole device_role);
@@ skipping 189 matching lines @@
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
   scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_