Handle audio device changes on Windows.

media/audio/audio_manager_base.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.
 
 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
 
 #include <map>
 #include <string>
+#include <utility>
 
 #include "base/atomic_ref_count.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread.h"
 #include "media/audio/audio_manager.h"
 
 #if defined(OS_WIN)
@@ skipping 95 matching lines @@
       AudioDeviceListener* listener) OVERRIDE;
   virtual void RemoveOutputDeviceChangeListener(
       AudioDeviceListener* listener) OVERRIDE;
 
  protected:
   AudioManagerBase();
 
   // TODO(dalecurtis): This must change to map both input and output parameters
   // to a single dispatcher, otherwise on a device state change we'll just get
   // the exact same invalid dispatcher.
-  typedef std::map<AudioParameters, scoped_refptr<AudioOutputDispatcher>,
-                   AudioParameters::Compare>
+  typedef std::map< std::pair<AudioParameters, AudioParameters>,

[scherkus (not reviewing), 2012/10/22 23:51:05]

nit: we usually don't have the space after the opening < (but as required by
compilers have a space before the trailing >)

[DaleCurtis, 2012/10/23 01:49:42]

Done.

+                    scoped_refptr<AudioOutputDispatcher> >
       AudioOutputDispatchersMap;
 
   // Shuts down the audio thread and releases all the audio output dispatchers
   // on the audio thread.  All audio streams should be freed before
   // Shutdown is called.
   // This must be called in the destructor of the AudioManager<Platform>.
   void Shutdown();
 
   void ShutdownOnAudioThread();
 
@@ skipping 33 matching lines @@
 
   // Track output state change listeners.
   ObserverList<AudioDeviceListener> output_listeners_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_