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/audio_devices_pref_handler.h"
  10 #include "chromeos/audio/cras_audio_handler.h"
  11
  12 namespace chromeos {
  13 class AudioDevicesPrefHandler;
  14 }
  15
  16 namespace extensions {
  17
  18 // Ensures that the "best" input and output audio devices are always active.
  19 class ShellAudioController : public chromeos::CrasAudioHandler::AudioObserver {
  20  public:
  21   // Requests max volume for all devices and doesn't bother saving prefs.
  22   class PrefHandler : public chromeos::AudioDevicesPrefHandler {
  23    public:
  24     PrefHandler();
  25
  26     // chromeos::AudioDevicesPrefHandler implementation:
  27     virtual double GetOutputVolumeValue(
  28         const chromeos::AudioDevice* device) override;
  29     virtual double GetInputGainValue(
  30         const chromeos::AudioDevice* device) override;
  31     virtual void SetVolumeGainValue(const chromeos::AudioDevice& device,
  32                                     double value) override;
  33     virtual bool GetMuteValue(const chromeos::AudioDevice& device) override;
  34     virtual void SetMuteValue(const chromeos::AudioDevice& device,
  35                               bool mute_on) override;
  36     virtual bool GetAudioCaptureAllowedValue() override;
  37     virtual bool GetAudioOutputAllowedValue() override;
  38     virtual void AddAudioPrefObserver(
  39         chromeos::AudioPrefObserver* observer) override;
  40     virtual void RemoveAudioPrefObserver(
  41         chromeos::AudioPrefObserver* observer) override;
  42
  43    protected:
  44     virtual ~PrefHandler();
  45
  46    private:
  47     DISALLOW_COPY_AND_ASSIGN(PrefHandler);
  48   };
  49
  50   ShellAudioController();
  51   virtual ~ShellAudioController();
  52
  53   // chromeos::CrasAudioHandler::Observer implementation:
  54   virtual void OnOutputVolumeChanged() override;
  55   virtual void OnOutputMuteChanged() override;
  56   virtual void OnInputGainChanged() override;
  57   virtual void OnInputMuteChanged() override;
  58   virtual void OnAudioNodesChanged() override;
  59   virtual void OnActiveOutputNodeChanged() override;
  60   virtual void OnActiveInputNodeChanged() override;
  61
  62  private:
  63   // Gets the current device list from CRAS, chooses the best input and output
  64   // device, and activates them if they aren't already active.
  65   void ActivateDevices();
  66
  67   DISALLOW_COPY_AND_ASSIGN(ShellAudioController);
  68 };
  69
  70 }  // namespace extensions
  71
  72 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_AUDIO_CONTROLLER_CHROMEOS_H_