Make AudioParameters a class instead of a struct

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 98 matching lines @@
     virtual void OnDeviceStarted(const std::string& device_id) = 0;
 
     // Notification to the client that the device has been stopped.
     virtual void OnDeviceStopped() = 0;
 
    protected:
     virtual ~CaptureEventHandler() {}
   };
 
   // Methods called on main render thread -------------------------------------
-  AudioInputDevice(size_t buffer_size,
-                   int channels,
-                   double sample_rate,
-                   CaptureCallback* callback,
+  AudioInputDevice(const AudioParameters& params, CaptureCallback* callback,
                    CaptureEventHandler* event_handler);
   virtual ~AudioInputDevice();
 
   // Specify the |session_id| to query which device to use. This method is
   // asynchronous/non-blocking.
   // Start() will use the second sequence if this method is called before.
   void SetDevice(int session_id);
 
   // Starts audio capturing. This method is asynchronous/non-blocking.
   // TODO(henrika): add support for notification when recording has started.
   void Start();
 
   // Stops audio capturing. This method is synchronous/blocking.
   // TODO(henrika): add support for notification when recording has stopped.
   void Stop();
 
   // Sets the capture volume scaling, with range [0.0, 1.0] inclusive.
   // Returns |true| on success.
   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 { return audio_parameters_.samples_per_packet; }
+  double sample_rate() const {
+    return audio_parameters_.sample_rate();
+  }
+
+  size_t buffer_size() const {
+    return audio_parameters_.frames_per_buffer();
+  }
 
   // Methods called on IO thread ----------------------------------------------
   // AudioInputMessageFilter::Delegate impl., called by AudioInputMessageFilter
   virtual void OnStreamCreated(base::SharedMemoryHandle handle,
                                base::SyncSocket::Handle socket_handle,
                                uint32 length) OVERRIDE;
   virtual void OnVolume(double volume) OVERRIDE;
   virtual void OnStateChanged(AudioStreamState state) OVERRIDE;
   virtual void OnDeviceReady(const std::string& device_id) OVERRIDE;
 
@@ skipping 43 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_