Move some generic functions to AudioManagerBase to be inherited by platform-specific AudioManager***

media/audio/mac/audio_manager_mac.h

 // Copyright (c) 2011 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_MAC_AUDIO_MANAGER_MAC_H_
 #define MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "media/audio/audio_manager_base.h"
 
 // Mac OS X implementation of the AudioManager singleton. This class is internal
 // to the audio output and only internal users can call methods not exposed by
 // the AudioManager class.
 class AudioManagerMac : public AudioManagerBase {
  public:
   AudioManagerMac();
 
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices() OVERRIDE;
   virtual bool HasAudioInputDevices() OVERRIDE;
   virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
       OVERRIDE;
-  virtual AudioOutputStream* MakeAudioOutputStream(
-      const AudioParameters& params) OVERRIDE;
-  virtual AudioInputStream* MakeAudioInputStream(
-      const AudioParameters& params, const std::string& device_id) OVERRIDE;
   virtual void MuteAll() OVERRIDE;
   virtual void UnMuteAll() OVERRIDE;
 
-  // Mac-only method to free the streams created by above facoty methods.
-  // They are called internally by the respective audio stream when it has
-  // been closed.
-  void ReleaseOutputStream(AudioOutputStream* stream);
-  void ReleaseInputStream(AudioInputStream* stream);
+  // Implementation of AudioManagerBase.
+  virtual AudioOutputStream* MakeLinearOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioOutputStream* MakeLowLatencyOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioInputStream* MakeLinearInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
+  virtual AudioInputStream* MakeLowLatencyInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
 
  protected:
   virtual ~AudioManagerMac();
 
  private:
-
-  // Number of currently open output streams.
-  size_t num_output_streams_;
-
   DISALLOW_COPY_AND_ASSIGN(AudioManagerMac);
 };
 
 #endif  // MEDIA_AUDIO_MAC_AUDIO_MANAGER_MAC_H_