Getting rid of AudioHardwareConfig and its synchronous IPC.

media/base/audio_hardware_config.h

-// Copyright (c) 2013 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_BASE_AUDIO_HARDWARE_CONFIG_H_
-#define MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/synchronization/lock.h"
-#include "media/base/audio_parameters.h"
-#include "media/base/channel_layout.h"
-#include "media/base/media_export.h"
-
-namespace media {
-
-// Provides thread safe access to the audio hardware configuration.
-class MEDIA_EXPORT AudioHardwareConfig {
- public:
-  AudioHardwareConfig(const media::AudioParameters& input_params,
-                      const media::AudioParameters& output_params);
-  virtual ~AudioHardwareConfig();
-
-  // Accessors for the currently cached hardware configuration.  Safe to call
-  // from any thread.
-  int GetOutputBufferSize() const;
-  int GetOutputSampleRate() const;
-  ChannelLayout GetOutputChannelLayout() const;
-  int GetOutputChannels() const;
-
-  int GetInputSampleRate() const;
-  ChannelLayout GetInputChannelLayout() const;
-  int GetInputChannels() const;
-
-  media::AudioParameters GetInputConfig() const;
-  media::AudioParameters GetOutputConfig() const;
-
-  // Allows callers to update the cached values for either input or output.  The
-  // values are paired under the assumption that these values will only be set
-  // after an input or output device change respectively.  Safe to call from
-  // any thread.
-  void UpdateInputConfig(const media::AudioParameters& input_params);
-  void UpdateOutputConfig(const media::AudioParameters& output_params);
-
- private:
-  // Cached values; access is protected by |config_lock_|.
-  mutable base::Lock config_lock_;
-  media::AudioParameters input_params_;
-  media::AudioParameters output_params_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioHardwareConfig);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_