Merge AudioRendererImpl and AudioRendererBase; add NullAudioSink

content/renderer/media/audio_input_device.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.
 
 // Low-latency audio capturing unit utilizing audio input stream provided
 // by browser process through IPC.
 //
 // Relationship of classes:
 //
 //  AudioInputController                 AudioInputDevice
@@ skipping 77 matching lines @@
 // OnCaptureStopped etc.) and ensure that we can deliver these notifications
 // to any clients using this class.
 class CONTENT_EXPORT AudioInputDevice
     : public AudioInputMessageFilter::Delegate,
       NON_EXPORTED_BASE(public ScopedLoopObserver),
       public base::RefCountedThreadSafe<AudioInputDevice> {
  public:
   class CONTENT_EXPORT CaptureCallback {
    public:
     virtual void Capture(const std::vector<float*>& audio_data,
-                         size_t number_of_frames,
-                         size_t audio_delay_milliseconds,
+                         int number_of_frames,
+                         int audio_delay_milliseconds,
                          double volume) = 0;
     virtual void OnCaptureError() = 0;
    protected:
     virtual ~CaptureCallback() {}
   };
 
   class CONTENT_EXPORT CaptureEventHandler {
    public:
     // Notification to the client that the device with the specific |device_id|
     // has been started.
@@ skipping 31 matching lines @@
   bool SetVolume(double volume);
 
   // Gets the capture volume scaling, with range [0.0, 1.0] inclusive.
   // Returns |true| on success.
   bool GetVolume(double* volume);
 
   double sample_rate() const {
     return audio_parameters_.sample_rate();
   }
 
-  size_t buffer_size() const {
+  int buffer_size() const {
     return audio_parameters_.frames_per_buffer();
   }
 
   // Sets the Automatic Gain Control state to on or off.
   // This method must be called before Start(). It will not have any effect
   // if it is called while capturing has already started.
   void SetAutomaticGainControl(bool enabled);
 
   // Methods called on IO thread ----------------------------------------------
   // AudioInputMessageFilter::Delegate impl., called by AudioInputMessageFilter.
@@ skipping 55 matching lines @@
   // In order to avoid a race between OnStreamCreated and Stop(), we use this
   // guard to control stopping and starting the audio thread.
   base::Lock audio_thread_lock_;
   AudioDeviceThread audio_thread_;
   scoped_ptr<AudioInputDevice::AudioThreadCallback> audio_callback_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputDevice);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_AUDIO_INPUT_DEVICE_H_