Support for audio output devices for getMediaDevices.

content/browser/renderer_host/media/media_stream_manager.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.
 
 // MediaStreamManager is used to open/enumerate media capture devices (video
 // supported now). Call flow:
 // 1. GenerateStream is called when a render process wants to use a capture
 //    device.
 // 2. MediaStreamManager will ask MediaStreamUIController for permission to
 //    use devices and for which device to use.
@@ skipping 228 matching lines @@
   void NotifyDevicesChanged(MediaStreamType stream_type,
                             const StreamDeviceInfoArray& devices);
 
   void HandleAccessRequestResponse(const std::string& label,
                                    const MediaStreamDevices& devices,
                                    content::MediaStreamRequestResult result);
   void StopMediaStreamFromBrowser(const std::string& label);
 
   void DoEnumerateDevices(const std::string& label);
 
+  // Enumerates audio output devices. No caching.
+  void EnumerateAudioOutputDevices(const std::string& label);
+
+  void AudioOutputDevicesEnumerated(const StreamDeviceInfoArray& devices);
+
   // Helpers.
   // Checks if all devices that was requested in the request identififed by
   // |label| has been opened and set the request state accordingly.
   void HandleRequestDone(const std::string& label,
                          DeviceRequest* request);
   // Stop the use of the device associated with |session_id| of type |type| in
   // all |requests_|. The device is removed from the request. If a request
   /// doesn't use any devices as a consequence, the request is deleted.
   void StopDevice(MediaStreamType type, int session_id);
   // Calls the correct capture manager and close the device with |session_id|.
@@ skipping 87 matching lines @@
   // the webrtcLoggingPrivate API if requested.
   void AddLogMessageOnUIThread(const std::set<int>& render_process_ids,
                                const std::string& message);
 
   // Handles the callback from MediaStreamUIProxy to receive the UI window id,
   // used for excluding the notification window in desktop capturing.
   void OnMediaStreamUIWindowId(MediaStreamType video_type,
                                StreamDeviceInfoArray devices,
                                gfx::NativeViewId window_id);
 
-  // Task runner shared by VideoCaptureManager and AudioInputDeviceManager.
+  // Task runner shared by VideoCaptureManager and AudioInputDeviceManager and
+  // used for enumerating audio output devices.
   // Note: Enumeration tasks may take seconds to complete so must never be run
   // on any of the BrowserThreads (UI, IO, etc).  See http://crbug.com/256945.
   scoped_refptr<base::SingleThreadTaskRunner> device_task_runner_;
 
   media::AudioManager* const audio_manager_;  // not owned
   scoped_refptr<AudioInputDeviceManager> audio_input_device_manager_;
   scoped_refptr<VideoCaptureManager> video_capture_manager_;
 
   // Indicator of device monitoring state.
   bool monitoring_started_;
@@ skipping 16 matching lines @@
 
   bool use_fake_ui_;
   scoped_ptr<FakeMediaStreamUIProxy> fake_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_MEDIA_STREAM_MANAGER_H_