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

media/audio/linux/alsa_input.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_LINUX_ALSA_INPUT_H_
 #define MEDIA_AUDIO_LINUX_ALSA_INPUT_H_
 
 #include <alsa/asoundlib.h>
 
 #include <string>
@@ skipping 16 matching lines @@
   // of the audio recording device.
   static const char* kAutoSelectDevice;
 
   // Create a PCM Output stream for the ALSA device identified by
   // |device_name|. If unsure of what to use for |device_name|, use
   // |kAutoSelectDevice|.
   AlsaPcmInputStream(AudioManagerLinux* audio_manager,
                      const std::string& device_name,
                      const AudioParameters& params,
                      AlsaWrapper* wrapper);
+
   virtual ~AlsaPcmInputStream();
 
   // Implementation of AudioInputStream.
   virtual bool Open() OVERRIDE;
   virtual void Start(AudioInputCallback* callback) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual double GetMaxVolume() OVERRIDE;
   virtual void SetVolume(double volume) OVERRIDE;
   virtual double GetVolume() OVERRIDE;
@@ skipping 29 matching lines @@
   snd_mixer_t* mixer_handle_; // Handle to the ALSA microphone mixer.
   snd_mixer_elem_t* mixer_element_handle_; // Handle to the capture element.
   base::WeakPtrFactory<AlsaPcmInputStream> weak_factory_;
   scoped_array<uint8> audio_packet_;  // Buffer used for reading audio data.
   bool read_callback_behind_schedule_;
 
   DISALLOW_COPY_AND_ASSIGN(AlsaPcmInputStream);
 };
 
 #endif  // MEDIA_AUDIO_LINUX_ALSA_INPUT_H_