ash/system/win/audio/tray_audio_delegate_win.cc

   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 #include "ash/system/win/audio/tray_audio_delegate_win.h"
   6
   7 #include <audiopolicy.h>
   8 #include <cmath>
   9
  10 #include "media/audio/win/core_audio_util_win.h"
  11
  12 using base::win::ScopedComPtr;
  13
  14 namespace {
  15
  16 // Volume value which should be considered as muted in range [0, 100].
  17 const int kMuteThresholdPercent = 1;
  18
  19 // Lowest volume which is considered to be audible in the range [0, 100].
  20 const int kDefaultUnmuteVolumePercent = 4;
  21
  22 }  // namespace
  23
  24 namespace ash  {
  25 namespace system {
  26
  27 void TrayAudioDelegateWin::AdjustOutputVolumeToAudibleLevel() {
  28   if (GetOutputVolumeLevel() <= kMuteThresholdPercent)
  29     SetOutputVolumeLevel(kDefaultUnmuteVolumePercent);
  30 }
  31
  32 int TrayAudioDelegateWin::GetOutputDefaultVolumeMuteLevel() {
  33   return kMuteThresholdPercent;
  34 }
  35
  36 int TrayAudioDelegateWin::GetOutputVolumeLevel() {
  37   ScopedComPtr<ISimpleAudioVolume> volume_control =
  38       CreateDefaultVolumeControl();
  39   if (!volume_control.get())
  40     return 0;
  41
  42   float level = 0.0f;
  43   if (FAILED(volume_control->GetMasterVolume(&level)))
  44     return 0;
  45
  46   // MSVC prior to 2013 doesn't have a round function.  The below code is not
  47   // conformant to C99 round(), but since we know that 0 <= level <= 100, it
  48   // should be ok.
  49   return static_cast<int>(level + 0.5);
  50 }
  51
  52 int TrayAudioDelegateWin::GetActiveOutputDeviceIconId() {
  53   return kNoAudioDeviceIcon;
  54 }
  55
  56 bool TrayAudioDelegateWin::HasAlternativeSources() {
  57   return false;
  58 }
  59
  60 bool TrayAudioDelegateWin::IsOutputAudioMuted() {
  61   ScopedComPtr<ISimpleAudioVolume> volume_control =
  62       CreateDefaultVolumeControl();
  63
  64   if (!volume_control.get())
  65     return false;
  66
  67   BOOL mute = FALSE;
  68   if (FAILED(volume_control->GetMute(&mute)))
  69     return false;
  70
  71   return !!mute;
  72 }
  73
  74 void TrayAudioDelegateWin::SetOutputAudioIsMuted(bool is_muted) {
  75   ScopedComPtr<ISimpleAudioVolume> volume_control =
  76       CreateDefaultVolumeControl();
  77
  78   if (!volume_control.get())
  79     return;
  80
  81   volume_control->SetMute(is_muted, NULL);
  82 }
  83
  84 void TrayAudioDelegateWin::SetOutputVolumeLevel(int level) {
  85   ScopedComPtr<ISimpleAudioVolume> volume_control =
  86       CreateDefaultVolumeControl();
  87
  88   if (!volume_control.get())
  89     return;
  90
  91   float volume_level = static_cast<float>(level) / 100.0f;
  92   volume_control->SetMasterVolume(volume_level, NULL);
  93 }
  94
  95 void TrayAudioDelegateWin::SetInternalSpeakerChannelMode(
  96     AudioChannelMode mode) {
  97 }
  98
  99 ScopedComPtr<ISimpleAudioVolume>
 100 TrayAudioDelegateWin::CreateDefaultVolumeControl() {
 101   ScopedComPtr<ISimpleAudioVolume> volume_control;
 102   ScopedComPtr<IAudioSessionManager> session_manager;
 103
 104   ScopedComPtr<IMMDevice> device =
 105       media::CoreAudioUtil::CreateDefaultDevice(eRender, eConsole);
 106   if (!device.get() ||
 107       FAILED(device->Activate(__uuidof(IAudioSessionManager), CLSCTX_ALL, NULL,
 108                               session_manager.ReceiveVoid()))) {
 109     return volume_control;
 110   }
 111
 112   session_manager->GetSimpleAudioVolume(NULL, FALSE,
 113       volume_control.Receive());
 114
 115   return volume_control;
 116 }
 117
 118 }  // namespace system
 119 }  // namespace ash