Reland 153623004: Remove the unified IO code on the browser

media/audio/audio_logging.h

 // Copyright 2013 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_LOGGING_H_
 #define MEDIA_AUDIO_AUDIO_LOGGING_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 
 namespace media {
 class AudioParameters;
 
 // AudioLog logs state information about an active audio component.  Each method
 // takes a |component_id| along with method specific information.  Its methods
 // are safe to call from any thread.
 class AudioLog {
  public:
   virtual ~AudioLog() {}
 
   // Called when an audio component is created.  |params| are the parameters of
-  // the created stream.  |input_device_id| and |output_device_id| are the
-  // respective device ids for input and output.  Either one or both may be
-  // specified.
+  // the created stream.  |device_id| is the id of the audio device opened by
+  // the created stream.
   virtual void OnCreated(int component_id,
                          const media::AudioParameters& params,
-                         const std::string& input_device_id,
-                         const std::string& output_device_id) = 0;
+                         const std::string& device_id) = 0;
 
   // Called when an audio component is started, generally this is synonymous
   // with "playing."
   virtual void OnStarted(int component_id) = 0;
 
   // Called when an audio component is stopped, generally this is synonymous
   // with "paused."
   virtual void OnStopped(int component_id) = 0;
 
   // Called when an audio component is closed, generally this is synonymous
@@ skipping 35 matching lines @@
   // create its own AudioLog.
   virtual scoped_ptr<AudioLog> CreateAudioLog(AudioComponent component) = 0;
 
  protected:
   virtual ~AudioLogFactory() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_LOGGING_H_