chromeos/audio/cras_audio_handler.cc

   1 // Copyright (c) 2013 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 "chromeos/audio/cras_audio_handler.h"
   6
   7 #include <algorithm>
   8 #include <cmath>
   9
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/logging.h"
  13 #include "chromeos/audio/audio_devices_pref_handler.h"
  14 #include "chromeos/audio/audio_devices_pref_handler_stub.h"
  15 #include "chromeos/dbus/dbus_thread_manager.h"
  16
  17 using std::max;
  18 using std::min;
  19
  20 namespace chromeos {
  21
  22 namespace {
  23
  24 // Default value for unmuting, as a percent in the range [0, 100].
  25 // Used when sound is unmuted, but volume was less than kMuteThresholdPercent.
  26 const int kDefaultUnmuteVolumePercent = 4;
  27
  28 // Volume value which should be considered as muted in range [0, 100].
  29 const int kMuteThresholdPercent = 1;
  30
  31 static CrasAudioHandler* g_cras_audio_handler = NULL;
  32
  33 bool IsSameAudioDevice(const AudioDevice& a, const AudioDevice& b) {
  34   return a.id == b.id && a.is_input == b.is_input && a.type == b.type
  35       && a.device_name == b.device_name;
  36 }
  37
  38 bool IsInNodeList(uint64_t node_id,
  39                   const CrasAudioHandler::NodeIdList& id_list) {
  40   return std::find(id_list.begin(), id_list.end(), node_id) != id_list.end();
  41 }
  42
  43 bool IsNodeInTheList(uint64_t node_id, const AudioNodeList& node_list) {
  44   for (size_t i = 0; i < node_list.size(); ++i) {
  45     if (node_id == node_list[i].id)
  46       return true;
  47   }
  48   return false;
  49 }
  50
  51 }  // namespace
  52
  53 CrasAudioHandler::AudioObserver::AudioObserver() {
  54 }
  55
  56 CrasAudioHandler::AudioObserver::~AudioObserver() {
  57 }
  58
  59 void CrasAudioHandler::AudioObserver::OnOutputNodeVolumeChanged(
  60     uint64_t /* node_id */,
  61     int /* volume */) {
  62 }
  63
  64 void CrasAudioHandler::AudioObserver::OnInputNodeGainChanged(
  65     uint64_t /* node_id */,
  66     int /* gain */) {
  67 }
  68
  69 void CrasAudioHandler::AudioObserver::OnOutputMuteChanged() {
  70 }
  71
  72 void CrasAudioHandler::AudioObserver::OnInputMuteChanged() {
  73 }
  74
  75 void CrasAudioHandler::AudioObserver::OnAudioNodesChanged() {
  76 }
  77
  78 void CrasAudioHandler::AudioObserver::OnActiveOutputNodeChanged() {
  79 }
  80
  81 void CrasAudioHandler::AudioObserver::OnActiveInputNodeChanged() {
  82 }
  83
  84 // static
  85 void CrasAudioHandler::Initialize(
  86     scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler) {
  87   CHECK(!g_cras_audio_handler);
  88   g_cras_audio_handler = new CrasAudioHandler(audio_pref_handler);
  89 }
  90
  91 // static
  92 void CrasAudioHandler::InitializeForTesting() {
  93   CHECK(!g_cras_audio_handler);
  94   CrasAudioHandler::Initialize(new AudioDevicesPrefHandlerStub());
  95 }
  96
  97 // static
  98 void CrasAudioHandler::Shutdown() {
  99   CHECK(g_cras_audio_handler);
 100   delete g_cras_audio_handler;
 101   g_cras_audio_handler = NULL;
 102 }
 103
 104 // static
 105 bool CrasAudioHandler::IsInitialized() {
 106   return g_cras_audio_handler != NULL;
 107 }
 108
 109 // static
 110 CrasAudioHandler* CrasAudioHandler::Get() {
 111   CHECK(g_cras_audio_handler)
 112       << "CrasAudioHandler::Get() called before Initialize().";
 113   return g_cras_audio_handler;
 114 }
 115
 116 void CrasAudioHandler::AddAudioObserver(AudioObserver* observer) {
 117   observers_.AddObserver(observer);
 118 }
 119
 120 void CrasAudioHandler::RemoveAudioObserver(AudioObserver* observer) {
 121   observers_.RemoveObserver(observer);
 122 }
 123
 124 bool CrasAudioHandler::HasKeyboardMic() {
 125   return GetKeyboardMic() != NULL;
 126 }
 127
 128 bool CrasAudioHandler::IsOutputMuted() {
 129   return output_mute_on_;
 130 }
 131
 132 bool CrasAudioHandler::IsOutputMutedForDevice(uint64_t device_id) {
 133   const AudioDevice* device = GetDeviceFromId(device_id);
 134   if (!device)
 135     return false;
 136   DCHECK(!device->is_input);
 137   return audio_pref_handler_->GetMuteValue(*device);
 138 }
 139
 140 bool CrasAudioHandler::IsOutputVolumeBelowDefaultMuteLevel() {
 141   return output_volume_ <= kMuteThresholdPercent;
 142 }
 143
 144 bool CrasAudioHandler::IsInputMuted() {
 145   return input_mute_on_;
 146 }
 147
 148 bool CrasAudioHandler::IsInputMutedForDevice(uint64_t device_id) {
 149   const AudioDevice* device = GetDeviceFromId(device_id);
 150   if (!device)
 151     return false;
 152   DCHECK(device->is_input);
 153   // We don't record input mute state for each device in the prefs,
 154   // for any non-active input device, we assume mute is off.
 155   if (device->id == active_input_node_id_)
 156     return input_mute_on_;
 157   return false;
 158 }
 159
 160 int CrasAudioHandler::GetOutputDefaultVolumeMuteThreshold() {
 161   return kMuteThresholdPercent;
 162 }
 163
 164 int CrasAudioHandler::GetOutputVolumePercent() {
 165   return output_volume_;
 166 }
 167
 168 int CrasAudioHandler::GetOutputVolumePercentForDevice(uint64_t device_id) {
 169   if (device_id == active_output_node_id_) {
 170     return output_volume_;
 171   } else {
 172     const AudioDevice* device = GetDeviceFromId(device_id);
 173     return static_cast<int>(audio_pref_handler_->GetOutputVolumeValue(device));
 174   }
 175 }
 176
 177 int CrasAudioHandler::GetInputGainPercent() {
 178   return input_gain_;
 179 }
 180
 181 int CrasAudioHandler::GetInputGainPercentForDevice(uint64_t device_id) {
 182   if (device_id == active_input_node_id_) {
 183     return input_gain_;
 184   } else {
 185     const AudioDevice* device = GetDeviceFromId(device_id);
 186     return static_cast<int>(audio_pref_handler_->GetInputGainValue(device));
 187   }
 188 }
 189
 190 uint64_t CrasAudioHandler::GetPrimaryActiveOutputNode() const {
 191   return active_output_node_id_;
 192 }
 193
 194 uint64_t CrasAudioHandler::GetPrimaryActiveInputNode() const {
 195   return active_input_node_id_;
 196 }
 197
 198 void CrasAudioHandler::GetAudioDevices(AudioDeviceList* device_list) const {
 199   device_list->clear();
 200   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 201        it != audio_devices_.end(); ++it)
 202     device_list->push_back(it->second);
 203 }
 204
 205 bool CrasAudioHandler::GetPrimaryActiveOutputDevice(AudioDevice* device) const {
 206   const AudioDevice* active_device = GetDeviceFromId(active_output_node_id_);
 207   if (!active_device || !device)
 208     return false;
 209   *device = *active_device;
 210   return true;
 211 }
 212
 213 void CrasAudioHandler::SetKeyboardMicActive(bool active) {
 214   const AudioDevice* keyboard_mic = GetKeyboardMic();
 215   if (!keyboard_mic)
 216     return;
 217   // Keyboard mic is invisible to chromeos users. It is always added or removed
 218   // as additional active node.
 219   DCHECK(active_input_node_id_ && active_input_node_id_ != keyboard_mic->id);
 220   if (active)
 221     AddActiveNode(keyboard_mic->id, true);
 222   else
 223     RemoveActiveNodeInternal(keyboard_mic->id, true);
 224 }
 225
 226 void CrasAudioHandler::AddActiveNode(uint64_t node_id, bool notify) {
 227   const AudioDevice* device = GetDeviceFromId(node_id);
 228   if (!device) {
 229     VLOG(1) << "AddActiveInputNode: Cannot find device id="
 230             << "0x" << std::hex << node_id;
 231     return;
 232   }
 233
 234   // If there is no primary active device, set |node_id| to primary active node.
 235   if ((device->is_input && !active_input_node_id_) ||
 236       (!device->is_input && !active_output_node_id_)) {
 237     SwitchToDevice(*device, notify);
 238     return;
 239   }
 240
 241   AddAdditionalActiveNode(node_id, notify);
 242 }
 243
 244 void CrasAudioHandler::ChangeActiveNodes(const NodeIdList& new_active_ids) {
 245   // Flags for whether there are input or output nodes passed in from
 246   // |new_active_ids|. If there are no input nodes passed in, we will not
 247   // make any change for input nodes; same for the output nodes.
 248   bool request_input_change = false;
 249   bool request_output_change = false;
 250
 251   // Flags for whether we will actually change active status of input
 252   // or output nodes.
 253   bool make_input_change = false;
 254   bool make_output_change = false;
 255
 256   NodeIdList nodes_to_activate;
 257   for (size_t i = 0; i < new_active_ids.size(); ++i) {
 258     const AudioDevice* device = GetDeviceFromId(new_active_ids[i]);
 259     if (device) {
 260       if (device->is_input)
 261         request_input_change = true;
 262       else
 263         request_output_change = true;
 264
 265       // If the new active device is already active, keep it as active.
 266       if (device->active)
 267         continue;
 268
 269       nodes_to_activate.push_back(new_active_ids[i]);
 270       if (device->is_input)
 271         make_input_change = true;
 272       else
 273         make_output_change = true;
 274     }
 275   }
 276
 277   // Remove all existing active devices that are not in the |new_active_ids|
 278   // list.
 279   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 280        it != audio_devices_.end(); ++it) {
 281     AudioDevice device = it->second;
 282     // Remove the existing active input or output nodes that are not in the new
 283     // active node list if there are new input or output nodes specified.
 284     if (device.active) {
 285       if ((device.is_input && request_input_change &&
 286            !IsInNodeList(device.id, new_active_ids))) {
 287         make_input_change = true;
 288         RemoveActiveNodeInternal(device.id, false);  // no notification.
 289       } else if (!device.is_input && request_output_change &&
 290                  !IsInNodeList(device.id, new_active_ids)) {
 291         make_output_change = true;
 292         RemoveActiveNodeInternal(device.id, false);  // no notification.
 293       }
 294     }
 295   }
 296
 297   // Adds the new active devices.
 298   for (size_t i = 0; i < nodes_to_activate.size(); ++i)
 299     AddActiveNode(nodes_to_activate[i], false);  // no notification.
 300
 301   // Notify the active nodes change now.
 302   if (make_input_change)
 303     NotifyActiveNodeChanged(true);
 304   if (make_output_change)
 305     NotifyActiveNodeChanged(false);
 306 }
 307
 308 void CrasAudioHandler::SwapInternalSpeakerLeftRightChannel(bool swap) {
 309   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 310        it != audio_devices_.end();
 311        ++it) {
 312     const AudioDevice& device = it->second;
 313     if (!device.is_input && device.type == AUDIO_TYPE_INTERNAL_SPEAKER) {
 314       chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->SwapLeftRight(
 315           device.id, swap);
 316       break;
 317     }
 318   }
 319 }
 320
 321 bool CrasAudioHandler::has_alternative_input() const {
 322   return has_alternative_input_;
 323 }
 324
 325 bool CrasAudioHandler::has_alternative_output() const {
 326   return has_alternative_output_;
 327 }
 328
 329 void CrasAudioHandler::SetOutputVolumePercent(int volume_percent) {
 330   // Set all active devices to the same volume.
 331   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 332        it != audio_devices_.end();
 333        it++) {
 334     const AudioDevice& device = it->second;
 335     if (!device.is_input && device.active)
 336       SetOutputNodeVolumePercent(device.id, volume_percent);
 337   }
 338 }
 339
 340 // TODO: Rename the 'Percent' to something more meaningful.
 341 void CrasAudioHandler::SetInputGainPercent(int gain_percent) {
 342   // TODO(jennyz): Should we set all input devices' gain to the same level?
 343   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 344        it != audio_devices_.end();
 345        it++) {
 346     const AudioDevice& device = it->second;
 347     if (device.is_input && device.active)
 348       SetInputNodeGainPercent(active_input_node_id_, gain_percent);
 349   }
 350 }
 351
 352 void CrasAudioHandler::AdjustOutputVolumeByPercent(int adjust_by_percent) {
 353   SetOutputVolumePercent(output_volume_ + adjust_by_percent);
 354 }
 355
 356 void CrasAudioHandler::SetOutputMute(bool mute_on) {
 357   if (!SetOutputMuteInternal(mute_on))
 358     return;
 359
 360   // Save the mute state for all active output audio devices.
 361   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 362        it != audio_devices_.end();
 363        it++) {
 364     const AudioDevice& device = it->second;
 365     if (!device.is_input && device.active) {
 366       audio_pref_handler_->SetMuteValue(device, output_mute_on_);
 367     }
 368   }
 369
 370   FOR_EACH_OBSERVER(AudioObserver, observers_, OnOutputMuteChanged());
 371 }
 372
 373 void CrasAudioHandler::AdjustOutputVolumeToAudibleLevel() {
 374   if (output_volume_ <= kMuteThresholdPercent) {
 375     // Avoid the situation when sound has been unmuted, but the volume
 376     // is set to a very low value, so user still can't hear any sound.
 377     SetOutputVolumePercent(kDefaultUnmuteVolumePercent);
 378   }
 379 }
 380
 381 void CrasAudioHandler::SetInputMute(bool mute_on) {
 382   SetInputMuteInternal(mute_on);
 383   FOR_EACH_OBSERVER(AudioObserver, observers_, OnInputMuteChanged());
 384 }
 385
 386 void CrasAudioHandler::SetActiveOutputNode(uint64_t node_id, bool notify) {
 387   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 388       SetActiveOutputNode(node_id);
 389   if (notify)
 390     NotifyActiveNodeChanged(false);
 391 }
 392
 393 void CrasAudioHandler::SetActiveInputNode(uint64_t node_id, bool notify) {
 394   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 395       SetActiveInputNode(node_id);
 396   if (notify)
 397     NotifyActiveNodeChanged(true);
 398 }
 399
 400 void CrasAudioHandler::SetVolumeGainPercentForDevice(uint64_t device_id,
 401                                                      int value) {
 402   const AudioDevice* device = GetDeviceFromId(device_id);
 403   if (!device)
 404     return;
 405
 406   if (device->is_input)
 407     SetInputNodeGainPercent(device_id, value);
 408   else
 409     SetOutputNodeVolumePercent(device_id, value);
 410 }
 411
 412 void CrasAudioHandler::SetMuteForDevice(uint64_t device_id, bool mute_on) {
 413   if (device_id == active_output_node_id_) {
 414     SetOutputMute(mute_on);
 415     return;
 416   } else if (device_id == active_input_node_id_) {
 417     VLOG(1) << "SetMuteForDevice sets active input device id="
 418             << "0x" << std::hex << device_id << " mute=" << mute_on;
 419     SetInputMute(mute_on);
 420     return;
 421   }
 422
 423   const AudioDevice* device = GetDeviceFromId(device_id);
 424   // Input device's mute state is not recorded in the pref. crbug.com/365050.
 425   if (device && !device->is_input)
 426     audio_pref_handler_->SetMuteValue(*device, mute_on);
 427 }
 428
 429 void CrasAudioHandler::LogErrors() {
 430   log_errors_ = true;
 431 }
 432
 433 CrasAudioHandler::CrasAudioHandler(
 434     scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler)
 435     : audio_pref_handler_(audio_pref_handler),
 436       output_mute_on_(false),
 437       input_mute_on_(false),
 438       output_volume_(0),
 439       input_gain_(0),
 440       active_output_node_id_(0),
 441       active_input_node_id_(0),
 442       has_alternative_input_(false),
 443       has_alternative_output_(false),
 444       output_mute_locked_(false),
 445       log_errors_(false),
 446       weak_ptr_factory_(this) {
 447   if (!audio_pref_handler.get())
 448     return;
 449   // If the DBusThreadManager or the CrasAudioClient aren't available, there
 450   // isn't much we can do. This should only happen when running tests.
 451   if (!chromeos::DBusThreadManager::IsInitialized() ||
 452       !chromeos::DBusThreadManager::Get() ||
 453       !chromeos::DBusThreadManager::Get()->GetCrasAudioClient())
 454     return;
 455   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->AddObserver(this);
 456   audio_pref_handler_->AddAudioPrefObserver(this);
 457   if (chromeos::DBusThreadManager::Get()->GetSessionManagerClient()) {
 458     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
 459         AddObserver(this);
 460   }
 461   InitializeAudioState();
 462 }
 463
 464 CrasAudioHandler::~CrasAudioHandler() {
 465   if (!chromeos::DBusThreadManager::IsInitialized() ||
 466       !chromeos::DBusThreadManager::Get() ||
 467       !chromeos::DBusThreadManager::Get()->GetCrasAudioClient())
 468     return;
 469   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 470       RemoveObserver(this);
 471   chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
 472       RemoveObserver(this);
 473   if (audio_pref_handler_.get())
 474     audio_pref_handler_->RemoveAudioPrefObserver(this);
 475   audio_pref_handler_ = NULL;
 476 }
 477
 478 void CrasAudioHandler::AudioClientRestarted() {
 479   // Make sure the logging is enabled in case cras server
 480   // restarts after crashing.
 481   LogErrors();
 482   InitializeAudioState();
 483 }
 484
 485 void CrasAudioHandler::NodesChanged() {
 486   // Refresh audio nodes data.
 487   GetNodes();
 488 }
 489
 490 void CrasAudioHandler::ActiveOutputNodeChanged(uint64_t node_id) {
 491   if (active_output_node_id_ == node_id)
 492     return;
 493
 494   // Active audio output device should always be changed by chrome.
 495   // During system boot, cras may change active input to unknown device 0x1,
 496   // we don't need to log it, since it is not an valid device.
 497   if (GetDeviceFromId(node_id)) {
 498     LOG_IF(WARNING, log_errors_)
 499         << "Active output node changed unexpectedly by system node_id="
 500         << "0x" << std::hex << node_id;
 501   }
 502 }
 503
 504 void CrasAudioHandler::ActiveInputNodeChanged(uint64_t node_id) {
 505   if (active_input_node_id_ == node_id)
 506     return;
 507
 508   // Active audio input device should always be changed by chrome.
 509   // During system boot, cras may change active input to unknown device 0x2,
 510   // we don't need to log it, since it is not an valid device.
 511   if (GetDeviceFromId(node_id)) {
 512     LOG_IF(WARNING, log_errors_)
 513         << "Active input node changed unexpectedly by system node_id="
 514         << "0x" << std::hex << node_id;
 515   }
 516 }
 517
 518 void CrasAudioHandler::OnAudioPolicyPrefChanged() {
 519   ApplyAudioPolicy();
 520 }
 521
 522 void CrasAudioHandler::EmitLoginPromptVisibleCalled() {
 523   // Enable logging after cras server is started, which will be after
 524   // EmitLoginPromptVisible.
 525   LogErrors();
 526 }
 527
 528 const AudioDevice* CrasAudioHandler::GetDeviceFromId(uint64_t device_id) const {
 529   AudioDeviceMap::const_iterator it = audio_devices_.find(device_id);
 530   if (it == audio_devices_.end())
 531     return NULL;
 532
 533   return &(it->second);
 534 }
 535
 536 const AudioDevice* CrasAudioHandler::GetKeyboardMic() const {
 537   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 538        it != audio_devices_.end(); it++) {
 539     if (it->second.is_input && it->second.type == AUDIO_TYPE_KEYBOARD_MIC)
 540       return &(it->second);
 541   }
 542   return NULL;
 543 }
 544
 545 void CrasAudioHandler::SetupAudioInputState() {
 546   // Set the initial audio state to the ones read from audio prefs.
 547   const AudioDevice* device = GetDeviceFromId(active_input_node_id_);
 548   if (!device) {
 549     LOG_IF(ERROR, log_errors_)
 550         << "Can't set up audio state for unknown input device id ="
 551         << "0x" << std::hex << active_input_node_id_;
 552     return;
 553   }
 554   input_gain_ = audio_pref_handler_->GetInputGainValue(device);
 555   VLOG(1) << "SetupAudioInputState for active device id="
 556           << "0x" << std::hex << device->id << " mute=" << input_mute_on_;
 557   SetInputMuteInternal(input_mute_on_);
 558   // TODO(rkc,jennyz): Set input gain once we decide on how to store
 559   // the gain values since the range and step are both device specific.
 560 }
 561
 562 void CrasAudioHandler::SetupAudioOutputState() {
 563   const AudioDevice* device = GetDeviceFromId(active_output_node_id_);
 564   if (!device) {
 565     LOG_IF(ERROR, log_errors_)
 566         << "Can't set up audio state for unknown output device id ="
 567         << "0x" << std::hex << active_output_node_id_;
 568     return;
 569   }
 570   DCHECK(!device->is_input);
 571   output_mute_on_ = audio_pref_handler_->GetMuteValue(*device);
 572   output_volume_ = audio_pref_handler_->GetOutputVolumeValue(device);
 573
 574   SetOutputMuteInternal(output_mute_on_);
 575   SetOutputNodeVolume(active_output_node_id_, output_volume_);
 576 }
 577
 578 // This sets up the state of an additional active node.
 579 void CrasAudioHandler::SetupAdditionalActiveAudioNodeState(uint64_t node_id) {
 580   const AudioDevice* device = GetDeviceFromId(node_id);
 581   if (!device) {
 582     VLOG(1) << "Can't set up audio state for unknown device id ="
 583             << "0x" << std::hex << node_id;
 584     return;
 585   }
 586
 587   DCHECK(node_id != active_output_node_id_ && node_id != active_input_node_id_);
 588
 589   // Note: The mute state is a system wide state, we don't set mute per device,
 590   // but just keep the mute state consistent for the active node in prefs.
 591   // The output volume should be set to the same value for all active output
 592   // devices. For input devices, we don't restore their gain value so far.
 593   // TODO(jennyz): crbug.com/417418, track the status for the decison if
 594   // we should persist input gain value in prefs.
 595   if (!device->is_input) {
 596     audio_pref_handler_->SetMuteValue(*device, IsOutputMuted());
 597     SetOutputNodeVolumePercent(node_id, GetOutputVolumePercent());
 598   }
 599 }
 600
 601 void CrasAudioHandler::InitializeAudioState() {
 602   ApplyAudioPolicy();
 603   GetNodes();
 604 }
 605
 606 void CrasAudioHandler::ApplyAudioPolicy() {
 607   output_mute_locked_ = false;
 608   if (!audio_pref_handler_->GetAudioOutputAllowedValue()) {
 609     // Mute the device, but do not update the preference.
 610     SetOutputMuteInternal(true);
 611     output_mute_locked_ = true;
 612   } else {
 613     // Restore the mute state.
 614     const AudioDevice* device = GetDeviceFromId(active_output_node_id_);
 615     if (device)
 616       SetOutputMuteInternal(audio_pref_handler_->GetMuteValue(*device));
 617   }
 618
 619   // Policy for audio input is handled by kAudioCaptureAllowed in the Chrome
 620   // media system.
 621 }
 622
 623 void CrasAudioHandler::SetOutputNodeVolume(uint64_t node_id, int volume) {
 624   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 625       SetOutputNodeVolume(node_id, volume);
 626 }
 627
 628 void CrasAudioHandler::SetOutputNodeVolumePercent(uint64_t node_id,
 629                                                   int volume_percent) {
 630   const AudioDevice* device = this->GetDeviceFromId(node_id);
 631   if (!device || device->is_input)
 632     return;
 633
 634   volume_percent = min(max(volume_percent, 0), 100);
 635   if (volume_percent <= kMuteThresholdPercent)
 636     volume_percent = 0;
 637   if (node_id == active_output_node_id_)
 638     output_volume_ = volume_percent;
 639
 640   audio_pref_handler_->SetVolumeGainValue(*device, volume_percent);
 641
 642   if (device->active) {
 643     SetOutputNodeVolume(node_id, volume_percent);
 644     FOR_EACH_OBSERVER(AudioObserver, observers_,
 645                       OnOutputNodeVolumeChanged(node_id, volume_percent));
 646   }
 647 }
 648
 649 bool  CrasAudioHandler::SetOutputMuteInternal(bool mute_on) {
 650   if (output_mute_locked_)
 651     return false;
 652
 653   output_mute_on_ = mute_on;
 654   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 655       SetOutputUserMute(mute_on);
 656   return true;
 657 }
 658
 659 void CrasAudioHandler::SetInputNodeGain(uint64_t node_id, int gain) {
 660   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 661       SetInputNodeGain(node_id, gain);
 662 }
 663
 664 void CrasAudioHandler::SetInputNodeGainPercent(uint64_t node_id,
 665                                                int gain_percent) {
 666   const AudioDevice* device = GetDeviceFromId(node_id);
 667   if (!device || !device->is_input)
 668     return;
 669
 670   // NOTE: We do not sanitize input gain values since the range is completely
 671   // dependent on the device.
 672   if (active_input_node_id_ == node_id)
 673     input_gain_ = gain_percent;
 674
 675   audio_pref_handler_->SetVolumeGainValue(*device, gain_percent);
 676
 677   if (device->active) {
 678     SetInputNodeGain(node_id, gain_percent);
 679     FOR_EACH_OBSERVER(AudioObserver, observers_,
 680                       OnInputNodeGainChanged(node_id, gain_percent));
 681   }
 682 }
 683
 684 void CrasAudioHandler::SetInputMuteInternal(bool mute_on) {
 685   input_mute_on_ = mute_on;
 686   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 687       SetInputMute(mute_on);
 688 }
 689
 690 void CrasAudioHandler::GetNodes() {
 691   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->GetNodes(
 692       base::Bind(&CrasAudioHandler::HandleGetNodes,
 693                  weak_ptr_factory_.GetWeakPtr()),
 694       base::Bind(&CrasAudioHandler::HandleGetNodesError,
 695                  weak_ptr_factory_.GetWeakPtr()));
 696 }
 697
 698 bool CrasAudioHandler::ChangeActiveDevice(const AudioDevice& new_active_device,
 699                                           uint64_t* current_active_node_id) {
 700   // If the device we want to switch to is already the current active device,
 701   // do nothing.
 702   if (new_active_device.active &&
 703       new_active_device.id == *current_active_node_id) {
 704     return false;
 705   }
 706
 707   // Reset all other input or output devices' active status. The active audio
 708   // device from the previous user session can be remembered by cras, but not
 709   // in chrome. see crbug.com/273271.
 710   for (AudioDeviceMap::iterator it = audio_devices_.begin();
 711        it != audio_devices_.end(); ++it) {
 712     if (it->second.is_input == new_active_device.is_input &&
 713         it->second.id != new_active_device.id)
 714       it->second.active = false;
 715   }
 716
 717   // Set the current active input/output device to the new_active_device.
 718   *current_active_node_id = new_active_device.id;
 719   audio_devices_[*current_active_node_id].active = true;
 720   return true;
 721 }
 722
 723 bool CrasAudioHandler::NonActiveDeviceUnplugged(size_t old_devices_size,
 724                                                 size_t new_devices_size,
 725                                                 uint64_t current_active_node) {
 726   return (new_devices_size < old_devices_size &&
 727           GetDeviceFromId(current_active_node));
 728 }
 729
 730 void CrasAudioHandler::SwitchToDevice(const AudioDevice& device, bool notify) {
 731   if (device.is_input) {
 732     if (!ChangeActiveDevice(device, &active_input_node_id_))
 733       return;
 734     SetupAudioInputState();
 735     SetActiveInputNode(active_input_node_id_, notify);
 736   } else {
 737     if (!ChangeActiveDevice(device, &active_output_node_id_))
 738       return;
 739     SetupAudioOutputState();
 740     SetActiveOutputNode(active_output_node_id_, notify);
 741   }
 742 }
 743
 744 bool CrasAudioHandler::HasDeviceChange(const AudioNodeList& new_nodes,
 745                                        bool is_input,
 746                                        AudioNodeList* new_discovered) {
 747   size_t num_old_devices = 0;
 748   size_t num_new_devices = 0;
 749   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 750        it != audio_devices_.end(); ++it) {
 751     if (is_input == it->second.is_input)
 752       ++num_old_devices;
 753   }
 754
 755   bool new_or_changed_device = false;
 756   new_discovered->clear();
 757   for (AudioNodeList::const_iterator it = new_nodes.begin();
 758        it != new_nodes.end(); ++it) {
 759     if (is_input == it->is_input) {
 760       ++num_new_devices;
 761       // Look to see if the new device not in the old device list.
 762       AudioDevice device(*it);
 763       DeviceStatus status = CheckDeviceStatus(device);
 764       if (status == NEW_DEVICE)
 765         new_discovered->push_back(*it);
 766       if (status == NEW_DEVICE || status == CHANGED_DEVICE) {
 767         new_or_changed_device = true;
 768       }
 769     }
 770   }
 771   return new_or_changed_device || (num_old_devices != num_new_devices);
 772 }
 773
 774 CrasAudioHandler::DeviceStatus CrasAudioHandler::CheckDeviceStatus(
 775     const AudioDevice& device) {
 776   const AudioDevice* device_found = GetDeviceFromId(device.id);
 777   if (!device_found)
 778     return NEW_DEVICE;
 779
 780   if (!IsSameAudioDevice(device, *device_found)) {
 781     LOG(WARNING) << "Different Audio devices with same id:"
 782         << " new device: " << device.ToString()
 783         << " old device: " << device_found->ToString();
 784     return CHANGED_DEVICE;
 785   } else if (device.active != device_found->active) {
 786     return CHANGED_DEVICE;
 787   }
 788
 789   return OLD_DEVICE;
 790 }
 791
 792 void CrasAudioHandler::NotifyActiveNodeChanged(bool is_input) {
 793   if (is_input)
 794     FOR_EACH_OBSERVER(AudioObserver, observers_, OnActiveInputNodeChanged());
 795   else
 796     FOR_EACH_OBSERVER(AudioObserver, observers_, OnActiveOutputNodeChanged());
 797 }
 798
 799 void CrasAudioHandler::UpdateDevicesAndSwitchActive(
 800     const AudioNodeList& nodes) {
 801   size_t old_output_device_size = 0;
 802   size_t old_input_device_size = 0;
 803   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 804        it != audio_devices_.end(); ++it) {
 805     if (it->second.is_input)
 806       ++old_input_device_size;
 807     else
 808       ++old_output_device_size;
 809   }
 810
 811   AudioNodeList hotplug_output_nodes;
 812   AudioNodeList hotplug_input_nodes;
 813   bool output_devices_changed =
 814       HasDeviceChange(nodes, false, &hotplug_output_nodes);
 815   bool input_devices_changed =
 816       HasDeviceChange(nodes, true, &hotplug_input_nodes);
 817   audio_devices_.clear();
 818   has_alternative_input_ = false;
 819   has_alternative_output_ = false;
 820
 821   while (!input_devices_pq_.empty())
 822     input_devices_pq_.pop();
 823   while (!output_devices_pq_.empty())
 824     output_devices_pq_.pop();
 825
 826   size_t new_output_device_size = 0;
 827   size_t new_input_device_size = 0;
 828   for (size_t i = 0; i < nodes.size(); ++i) {
 829     AudioDevice device(nodes[i]);
 830     audio_devices_[device.id] = device;
 831
 832     if (!has_alternative_input_ &&
 833         device.is_input &&
 834         device.type != AUDIO_TYPE_INTERNAL_MIC &&
 835         device.type != AUDIO_TYPE_KEYBOARD_MIC) {
 836       has_alternative_input_ = true;
 837     } else if (!has_alternative_output_ &&
 838                !device.is_input &&
 839                device.type != AUDIO_TYPE_INTERNAL_SPEAKER) {
 840       has_alternative_output_ = true;
 841     }
 842
 843     if (device.is_input) {
 844       input_devices_pq_.push(device);
 845       ++new_input_device_size;
 846     } else {
 847       output_devices_pq_.push(device);
 848       ++new_output_device_size;
 849     }
 850   }
 851
 852   // If the previous active device is removed from the new node list,
 853   // reset active_output_node_id_.
 854   if (!GetDeviceFromId(active_output_node_id_))
 855     active_output_node_id_ = 0;
 856   if (!GetDeviceFromId(active_input_node_id_))
 857     active_input_node_id_ = 0;
 858
 859   // If audio nodes change is caused by unplugging some non-active audio
 860   // devices, the previously set active audio device will stay active.
 861   // Otherwise, switch to a new active audio device according to their priority.
 862   if (input_devices_changed &&
 863       !NonActiveDeviceUnplugged(old_input_device_size,
 864                                 new_input_device_size,
 865                                 active_input_node_id_)) {
 866     // Some devices like chromeboxes don't have the internal audio input. In
 867     // that case the active input node id should be reset.
 868     if (input_devices_pq_.empty()) {
 869       active_input_node_id_ = 0;
 870       NotifyActiveNodeChanged(true);
 871     } else {
 872       // If user has hot plugged a new node, we should change to the active
 873       // device to the new node if it has the highest priority; otherwise,
 874       // we should keep the existing active node chosen by user.
 875       // For all other cases, we will choose the node with highest priority.
 876       if (!active_input_node_id_ || hotplug_input_nodes.empty() ||
 877           IsNodeInTheList(input_devices_pq_.top().id, hotplug_input_nodes)) {
 878         SwitchToDevice(input_devices_pq_.top(), true);
 879       }
 880     }
 881   }
 882   if (output_devices_changed &&
 883       !NonActiveDeviceUnplugged(old_output_device_size,
 884                                 new_output_device_size,
 885                                 active_output_node_id_)) {
 886     // This is really unlikely to happen because all ChromeOS devices have the
 887     // internal audio output.
 888     if (output_devices_pq_.empty()) {
 889       active_output_node_id_ = 0;
 890       NotifyActiveNodeChanged(false);
 891     } else {
 892       // ditto input node case.
 893       if (!active_output_node_id_ || hotplug_output_nodes.empty() ||
 894           IsNodeInTheList(output_devices_pq_.top().id, hotplug_output_nodes)) {
 895         SwitchToDevice(output_devices_pq_.top(), true);
 896       }
 897     }
 898   }
 899 }
 900
 901 void CrasAudioHandler::HandleGetNodes(const chromeos::AudioNodeList& node_list,
 902                                       bool success) {
 903   if (!success) {
 904     LOG_IF(ERROR, log_errors_) << "Failed to retrieve audio nodes data";
 905     return;
 906   }
 907
 908   UpdateDevicesAndSwitchActive(node_list);
 909   FOR_EACH_OBSERVER(AudioObserver, observers_, OnAudioNodesChanged());
 910 }
 911
 912 void CrasAudioHandler::HandleGetNodesError(const std::string& error_name,
 913                                            const std::string& error_msg) {
 914   LOG_IF(ERROR, log_errors_) << "Failed to call GetNodes: "
 915       << error_name  << ": " << error_msg;
 916 }
 917
 918 void CrasAudioHandler::AddAdditionalActiveNode(uint64_t node_id, bool notify) {
 919   const AudioDevice* device = GetDeviceFromId(node_id);
 920   if (!device) {
 921     VLOG(1) << "AddActiveInputNode: Cannot find device id="
 922             << "0x" << std::hex << node_id;
 923     return;
 924   }
 925
 926   audio_devices_[node_id].active = true;
 927   SetupAdditionalActiveAudioNodeState(node_id);
 928
 929   if (device->is_input) {
 930     DCHECK(node_id != active_input_node_id_);
 931     chromeos::DBusThreadManager::Get()
 932         ->GetCrasAudioClient()
 933         ->AddActiveInputNode(node_id);
 934     if (notify)
 935       NotifyActiveNodeChanged(true);
 936   } else {
 937     DCHECK(node_id != active_output_node_id_);
 938     chromeos::DBusThreadManager::Get()
 939         ->GetCrasAudioClient()
 940         ->AddActiveOutputNode(node_id);
 941     if (notify)
 942       NotifyActiveNodeChanged(false);
 943   }
 944 }
 945
 946 void CrasAudioHandler::RemoveActiveNodeInternal(uint64_t node_id, bool notify) {
 947   const AudioDevice* device = GetDeviceFromId(node_id);
 948   if (!device) {
 949     VLOG(1) << "RemoveActiveInputNode: Cannot find device id="
 950             << "0x" << std::hex << node_id;
 951     return;
 952   }
 953
 954   audio_devices_[node_id].active = false;
 955   if (device->is_input) {
 956     if (node_id == active_input_node_id_)
 957       active_input_node_id_ = 0;
 958     chromeos::DBusThreadManager::Get()
 959         ->GetCrasAudioClient()
 960         ->RemoveActiveInputNode(node_id);
 961     if (notify)
 962       NotifyActiveNodeChanged(true);
 963   } else {
 964     if (node_id == active_output_node_id_)
 965       active_output_node_id_ = 0;
 966     chromeos::DBusThreadManager::Get()
 967         ->GetCrasAudioClient()
 968         ->RemoveActiveOutputNode(node_id);
 969     if (notify)
 970       NotifyActiveNodeChanged(false);
 971   }
 972 }
 973
 974 }  // namespace chromeos