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

media/audio/linux/audio_manager_linux.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_LINUX_AUDIO_MANAGER_LINUX_H_
 #define MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_
 
 #include <string>
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "media/audio/audio_manager_base.h"
 
 class AlsaWrapper;
 
 class MEDIA_EXPORT AudioManagerLinux : public AudioManagerBase {
  public:
   AudioManagerLinux();
 
   // Call before using a newly created AudioManagerLinux instance.
   virtual void Init() OVERRIDE;
 
   // Implementation of AudioManager.
   virtual bool HasAudioOutputDevices() OVERRIDE;
   virtual bool HasAudioInputDevices() OVERRIDE;
-  virtual AudioOutputStream* MakeAudioOutputStream(
-      const AudioParameters& params) OVERRIDE;
-  virtual AudioInputStream* MakeAudioInputStream(
-      const AudioParameters& params, const std::string& device_id) OVERRIDE;
   virtual bool CanShowAudioInputSettings() OVERRIDE;
   virtual void ShowAudioInputSettings() OVERRIDE;
   virtual void GetAudioInputDeviceNames(media::AudioDeviceNames* device_names)
       OVERRIDE;
-
   virtual void MuteAll() OVERRIDE;
   virtual void UnMuteAll() OVERRIDE;
 
-  virtual void ReleaseOutputStream(AudioOutputStream* stream);
+  // Implementation of AudioManagerBase.
+  virtual int GetMaxAudioOutputStreamsAllowed() OVERRIDE;
+  virtual AudioOutputStream* MakeAudioLinearOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioOutputStream* MakeAudioLowLatencyOutputStream(
+      const AudioParameters& params) OVERRIDE;
+  virtual AudioInputStream* MakeAudioLinearInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
+  virtual AudioInputStream* MakeAudioLowLatencyInputStream(
+      const AudioParameters& params, const std::string& device_id) OVERRIDE;
 
  protected:
   virtual ~AudioManagerLinux();
 
  private:
   enum StreamType {
     kStreamPlayback = 0,
     kStreamCapture,
   };
 
   // Gets a list of available ALSA input devices.
   void GetAlsaAudioInputDevices(media::AudioDeviceNames* device_names);
 
   // Gets the ALSA devices' names and ids.
   void GetAlsaDevicesInfo(void** hint, media::AudioDeviceNames* device_names);
 
   // Checks if the specific ALSA device is available.
   bool IsAlsaDeviceAvailable(const char* device_name);
 
   // Returns true if a device is present for the given stream type.
   bool HasAnyAlsaAudioDevice(StreamType stream);
 
+  // Called by MakeAudioLinearOutputStream and MakeAudioLowLatencyOutputStream.
+  AudioOutputStream* MakeOutputStream(const AudioParameters& params);
+
+  // Called by MakeAudioLinearInputStream and MakeAudioLowLatencyInputStream.
+  AudioInputStream* MakeInputStream(const AudioParameters& params,
+                                    const std::string& device_id);
+
   scoped_ptr<AlsaWrapper> wrapper_;
 
-  size_t active_output_stream_count_;
-
   DISALLOW_COPY_AND_ASSIGN(AudioManagerLinux);
 };
 
 #endif  // MEDIA_AUDIO_LINUX_AUDIO_MANAGER_LINUX_H_