extensions/shell/browser/shell_audio_controller_chromeos.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef EXTENSIONS_SHELL_BROWSER_SHELL_AUDIO_CONTROLLER_CHROMEOS_H_
   6 #define EXTENSIONS_SHELL_BROWSER_SHELL_AUDIO_CONTROLLER_CHROMEOS_H_
   7
   8 #include "base/macros.h"
   9 #include "chromeos/audio/cras_audio_handler.h"
  10
  11 namespace extensions {
  12
  13 // Ensures that the "best" input and output audio devices are always active.
  14 class ShellAudioController : public chromeos::CrasAudioHandler::AudioObserver {
  15  public:
  16   ShellAudioController();
  17   ~ShellAudioController() override;
  18
  19   // chromeos::CrasAudioHandler::Observer implementation:
  20   void OnOutputNodeVolumeChanged(uint64_t node_id, int volume) override;
  21   void OnOutputMuteChanged(bool mute_on) override;
  22   void OnInputNodeGainChanged(uint64_t node_id, int gain) override;
  23   void OnInputMuteChanged(bool mute_on) override;
  24   void OnAudioNodesChanged() override;
  25   void OnActiveOutputNodeChanged() override;
  26   void OnActiveInputNodeChanged() override;
  27
  28  private:
  29   // Gets the current device list from CRAS, chooses the best input and output
  30   // device, and activates them if they aren't already active.
  31   void ActivateDevices();
  32
  33   DISALLOW_COPY_AND_ASSIGN(ShellAudioController);
  34 };
  35
  36 }  // namespace extensions
  37
  38 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_AUDIO_CONTROLLER_CHROMEOS_H_