ash/system/audio/tray_audio_delegate.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 ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
   6 #define ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
   7
   8 namespace ash {
   9 namespace system {
  10
  11 class ASH_EXPORT TrayAudioDelegate {
  12  public:
  13
  14   enum { kNoAudioDeviceIcon = -1 };
  15   enum AudioChannelMode {
  16     NORMAL,
  17     LEFT_RIGHT_SWAPPED,
  18   };
  19
  20   virtual ~TrayAudioDelegate() {}
  21
  22   // Sets the volume level of the output device to the minimum level which is
  23   // deemed to be audible.
  24   virtual void AdjustOutputVolumeToAudibleLevel() = 0;
  25
  26   // Gets the default level in the range 0%-100% at which the output device
  27   // should be muted.
  28   virtual int GetOutputDefaultVolumeMuteLevel() = 0;
  29
  30   // Gets the icon to use for the active output device.
  31   virtual int GetActiveOutputDeviceIconId() = 0;
  32
  33   // Returns the volume level of the output device in the range 0%-100%.
  34   virtual int GetOutputVolumeLevel() = 0;
  35
  36   // Returns true if the device has alternative inputs or outputs.
  37   virtual bool HasAlternativeSources() = 0;
  38
  39   // Returns whether the output volume is muted.
  40   virtual bool IsOutputAudioMuted() = 0;
  41
  42   // Sets the mute state of the output device.
  43   virtual void SetOutputAudioIsMuted(bool is_muted) = 0;
  44
  45   // Sets the volume level of the output device in the range 0%-100%
  46   virtual void SetOutputVolumeLevel(int level) = 0;
  47
  48   // Sets the internal speaker's channel mode.
  49   virtual void SetInternalSpeakerChannelMode(AudioChannelMode mode) = 0;
  50
  51   // If necessary, sets the starting point for re-discovering the active HDMI
  52   // output device caused by device entering/exiting docking mode, HDMI display
  53   // changing resolution, or chromeos device suspend/resume. If
  54   // |force_rediscovering| is true, it will force to set the starting point for
  55   // re-discovering the active HDMI output device again if it has been in the
  56   // middle of rediscovering the HDMI active output device.
  57   virtual void SetActiveHDMIOutoutRediscoveringIfNecessary(
  58       bool force_rediscovering) = 0;
  59 };
  60
  61 }  // namespace system
  62 }  // namespace ash
  63
  64 #endif  // ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_