Revert 198556 "Implement the rest of the audio API."

trunk/src/chromeos/audio/audio_devices_pref_handler.h

 // Copyright (c) 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 CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
 #define CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "chromeos/audio/audio_pref_observer.h"
 #include "chromeos/chromeos_export.h"
 
 class PrefRegistrySimple;
 
 namespace chromeos {
 
 // Interface that handles audio preference related work, reads and writes
 // audio preferences, and notifies AudioPrefObserver for audio preference
 // changes.
 class CHROMEOS_EXPORT AudioDevicesPrefHandler
     : public base::RefCountedThreadSafe<AudioDevicesPrefHandler> {
  public:
-  // Gets the audio output volume value from prefs for a device. Since we can
-  // only have either a gain or a volume for a device (depending on whether it
-  // is input or output), we don't really care which value it is.
-  virtual double GetVolumeGainValue(uint64 device_id) = 0;
-  // Sets the audio volume or gain value to prefs for a device.
-  virtual void SetVolumeGainValue(uint64 device_id, double value) = 0;
+  // Gets the audio output volume value from prefs for the active device.
+  virtual double GetOutputVolumeValue() = 0;
+  // Reads the audio output mute value from prefs for the active device.
+  virtual bool GetOutputMuteValue() = 0;
 
-  // Reads the audio mute value from prefs for a device.
-  virtual bool GetMuteValue(uint64 device_id) = 0;
-  // Sets the audio mute value to prefs for a device.
-  virtual void SetMuteValue(uint64 device_id, bool mute_on) = 0;
+  // Sets the output audio volume value to prefs for the active device.
+  virtual void SetOutputVolumeValue(double volume_percent) = 0;
+  // Sets the audio output mute value to prefs for the active device.
+  virtual void SetOutputMuteValue(bool mute_on) = 0;
 
   // Reads the audio capture allowed value from prefs.
   virtual bool GetAudioCaptureAllowedValue() = 0;
   // Reads the audio output allowed value from prefs.
   virtual bool GetAudioOutputAllowedValue() = 0;
 
   // Adds an audio preference observer.
   virtual void AddAudioPrefObserver(AudioPrefObserver* observer) = 0;
   // Removes an audio preference observer.
   virtual void RemoveAudioPrefObserver(AudioPrefObserver* observer) = 0;
 
   // Creates the instance.
   static AudioDevicesPrefHandler* Create(PrefService* local_state);
 
  protected:
   virtual ~AudioDevicesPrefHandler() {}
 
  private:
   friend class base::RefCountedThreadSafe<AudioDevicesPrefHandler>;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_H_