Remove AudioOutputDeviceEnumerator. Replace usage with MediaDevicesManager.

content/browser/renderer_host/media/audio_output_device_enumerator.h

-// Copyright (c) 2015 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.
-
-// AudioOutputDeviceEnumerator is used to enumerate audio output devices.
-// It can return cached results of previous enumerations in order to boost
-// performance.
-// All its public methods must be called on the thread where the object is
-// created.
-
-#ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_DEVICE_ENUMERATOR_H_
-#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_DEVICE_ENUMERATOR_H_
-
-#include <stdint.h>
-
-#include <list>
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "base/threading/thread_checker.h"
-#include "content/common/content_export.h"
-#include "media/base/audio_parameters.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}
-
-namespace media {
-class AudioManager;
-}
-
-namespace content {
-
-// AudioOutputDeviceInfo describes information about an audio output device.
-// The enumerations returned by AudioOutputDeviceEnumerator::Enumerate() contain
-// elements of this type. It is used only in the browser side.
-struct AudioOutputDeviceInfo {
-  AudioOutputDeviceInfo();
-  AudioOutputDeviceInfo(const AudioOutputDeviceInfo& audio_output_device_info);
-  AudioOutputDeviceInfo(AudioOutputDeviceInfo&& audio_output_device_info);
-  AudioOutputDeviceInfo& operator=(
-      const AudioOutputDeviceInfo& audio_output_device_info);
-  AudioOutputDeviceInfo(const std::string& unique_id,
-                        const std::string& device_name,
-                        const std::string& group_id,
-                        media::AudioParameters output_params);
-  ~AudioOutputDeviceInfo();
-  std::string unique_id;
-  std::string device_name;
-  std::string group_id;
-  media::AudioParameters output_params;
-};
-
-// The result of an enumeration. It is used only in the browser side.
-struct AudioOutputDeviceEnumeration {
- public:
-  AudioOutputDeviceEnumeration(
-      const std::vector<AudioOutputDeviceInfo>& devices,
-      bool has_actual_devices);
-  AudioOutputDeviceEnumeration();
-  AudioOutputDeviceEnumeration(const AudioOutputDeviceEnumeration& other);
-  ~AudioOutputDeviceEnumeration();
-
-  std::vector<AudioOutputDeviceInfo> devices;
-  bool has_actual_devices;
-};
-
-typedef base::Callback<void(const AudioOutputDeviceEnumeration&)>
-    AudioOutputDeviceEnumerationCB;
-
-class CONTENT_EXPORT AudioOutputDeviceEnumerator {
- public:
-  enum CachePolicy {
-    CACHE_POLICY_NO_CACHING,
-    CACHE_POLICY_MANUAL_INVALIDATION
-  };
-  AudioOutputDeviceEnumerator(media::AudioManager* audio_manager,
-                              CachePolicy cache_policy);
-  ~AudioOutputDeviceEnumerator();
-
-  // Does an enumeration and provides the results to the callback.
-  // If there are no physical devices, the result contains a single entry with
-  // the default parameters provided by the underlying audio manager and with
-  // the |has_actual_devices| field set to false.
-  // The behavior with no physical devices is there to ease the transition
-  // from the use of RenderThreadImpl::GetAudioHardwareConfig(), which always
-  // provides default parameters, even if there are no devices.
-  // See https://crbug.com/549125.
-  // Some audio managers always report a single device, regardless of the
-  // physical devices in the system. In this case the |has_actual_devices| field
-  // is set to true to differentiate from the case of no physical devices.
-  void Enumerate(const AudioOutputDeviceEnumerationCB& callback);
-
-  // Invalidates the current cache.
-  void InvalidateCache();
-
-  // Sets the cache policy.
-  void SetCachePolicy(CachePolicy cache_policy);
-
-  // Returns true if the caching policy is different from
-  // CACHE_POLICY_NO_CACHING, false otherwise.
-  bool IsCacheEnabled();
-
- private:
-  void InitializeOnIOThread();
-  void DoEnumerateDevices();
-  AudioOutputDeviceEnumeration DoEnumerateDevicesOnDeviceThread();
-  void DevicesEnumerated(const AudioOutputDeviceEnumeration& snapshot);
-  int64_t NewEventSequence();
-  bool IsLastEnumerationValid() const;
-
-  media::AudioManager* const audio_manager_;
-  CachePolicy cache_policy_;
-  AudioOutputDeviceEnumeration cache_;
-  std::list<AudioOutputDeviceEnumerationCB> pending_callbacks_;
-
-  // sequential number that serves as logical clock
-  int64_t current_event_sequence_;
-
-  int64_t seq_last_enumeration_;
-  int64_t seq_last_invalidation_;
-  bool is_enumeration_ongoing_;
-
-  base::ThreadChecker thread_checker_;
-  base::WeakPtrFactory<AudioOutputDeviceEnumerator> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioOutputDeviceEnumerator);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_OUTPUT_DEVICE_ENUMERATOR_H_