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 }  // namespace
  39
  40 CrasAudioHandler::AudioObserver::AudioObserver() {
  41 }
  42
  43 CrasAudioHandler::AudioObserver::~AudioObserver() {
  44 }
  45
  46 void CrasAudioHandler::AudioObserver::OnOutputVolumeChanged() {
  47 }
  48
  49 void CrasAudioHandler::AudioObserver::OnInputGainChanged() {
  50 }
  51
  52 void CrasAudioHandler::AudioObserver::OnOutputMuteChanged() {
  53 }
  54
  55 void CrasAudioHandler::AudioObserver::OnInputMuteChanged() {
  56 }
  57
  58 void CrasAudioHandler::AudioObserver::OnAudioNodesChanged() {
  59 }
  60
  61 void CrasAudioHandler::AudioObserver::OnActiveOutputNodeChanged() {
  62 }
  63
  64 void CrasAudioHandler::AudioObserver::OnActiveInputNodeChanged() {
  65 }
  66
  67 // static
  68 void CrasAudioHandler::Initialize(
  69     scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler) {
  70   CHECK(!g_cras_audio_handler);
  71   g_cras_audio_handler = new CrasAudioHandler(audio_pref_handler);
  72 }
  73
  74 // static
  75 void CrasAudioHandler::InitializeForTesting() {
  76   CHECK(!g_cras_audio_handler);
  77   CrasAudioHandler::Initialize(new AudioDevicesPrefHandlerStub());
  78 }
  79
  80 // static
  81 void CrasAudioHandler::Shutdown() {
  82   CHECK(g_cras_audio_handler);
  83   delete g_cras_audio_handler;
  84   g_cras_audio_handler = NULL;
  85 }
  86
  87 // static
  88 bool CrasAudioHandler::IsInitialized() {
  89   return g_cras_audio_handler != NULL;
  90 }
  91
  92 // static
  93 CrasAudioHandler* CrasAudioHandler::Get() {
  94   CHECK(g_cras_audio_handler)
  95       << "CrasAudioHandler::Get() called before Initialize().";
  96   return g_cras_audio_handler;
  97 }
  98
  99 void CrasAudioHandler::AddAudioObserver(AudioObserver* observer) {
 100   observers_.AddObserver(observer);
 101 }
 102
 103 void CrasAudioHandler::RemoveAudioObserver(AudioObserver* observer) {
 104   observers_.RemoveObserver(observer);
 105 }
 106
 107 bool CrasAudioHandler::IsOutputMuted() {
 108   return output_mute_on_;
 109 }
 110
 111 bool CrasAudioHandler::IsOutputMutedForDevice(uint64 device_id) {
 112   const AudioDevice* device = GetDeviceFromId(device_id);
 113   if (!device)
 114     return false;
 115   return audio_pref_handler_->GetMuteValue(*device);
 116 }
 117
 118 bool CrasAudioHandler::IsOutputVolumeBelowDefaultMuteLvel() {
 119   return output_volume_ <= kMuteThresholdPercent;
 120 }
 121
 122 bool CrasAudioHandler::IsInputMuted() {
 123   return input_mute_on_;
 124 }
 125
 126 bool CrasAudioHandler::IsInputMutedForDevice(uint64 device_id) {
 127   const AudioDevice* device = GetDeviceFromId(device_id);
 128   if (!device)
 129     return false;
 130   return audio_pref_handler_->GetMuteValue(*device);
 131 }
 132
 133 int CrasAudioHandler::GetOutputVolumePercent() {
 134   return output_volume_;
 135 }
 136
 137 int CrasAudioHandler::GetOutputVolumePercentForDevice(uint64 device_id) {
 138   if (device_id == active_output_node_id_) {
 139     return output_volume_;
 140   } else {
 141     const AudioDevice* device = GetDeviceFromId(device_id);
 142     return static_cast<int>(audio_pref_handler_->GetOutputVolumeValue(device));
 143   }
 144 }
 145
 146 int CrasAudioHandler::GetInputGainPercent() {
 147   return input_gain_;
 148 }
 149
 150 int CrasAudioHandler::GetInputGainPercentForDevice(uint64 device_id) {
 151   if (device_id == active_input_node_id_) {
 152     return input_gain_;
 153   } else {
 154     const AudioDevice* device = GetDeviceFromId(device_id);
 155     return static_cast<int>(audio_pref_handler_->GetInputGainValue(device));
 156   }
 157 }
 158
 159 uint64 CrasAudioHandler::GetActiveOutputNode() const {
 160   return active_output_node_id_;
 161 }
 162
 163 uint64 CrasAudioHandler::GetActiveInputNode() const {
 164   return active_input_node_id_;
 165 }
 166
 167 void CrasAudioHandler::GetAudioDevices(AudioDeviceList* device_list) const {
 168   device_list->clear();
 169   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 170        it != audio_devices_.end(); ++it)
 171     device_list->push_back(it->second);
 172 }
 173
 174 bool CrasAudioHandler::GetActiveOutputDevice(AudioDevice* device) const {
 175   const AudioDevice* active_device = GetDeviceFromId(active_output_node_id_);
 176   if (!active_device || !device)
 177     return false;
 178   *device = *active_device;
 179   return true;
 180 }
 181
 182 bool CrasAudioHandler::has_alternative_input() const {
 183   return has_alternative_input_;
 184 }
 185
 186 bool CrasAudioHandler::has_alternative_output() const {
 187   return has_alternative_output_;
 188 }
 189
 190 void CrasAudioHandler::SetOutputVolumePercent(int volume_percent) {
 191   volume_percent = min(max(volume_percent, 0), 100);
 192   if (volume_percent <= kMuteThresholdPercent)
 193     volume_percent = 0;
 194   output_volume_ = volume_percent;
 195
 196   if (const AudioDevice* device = GetDeviceFromId(active_output_node_id_))
 197     audio_pref_handler_->SetVolumeGainValue(*device, output_volume_);
 198
 199   SetOutputNodeVolume(active_output_node_id_, output_volume_);
 200   FOR_EACH_OBSERVER(AudioObserver, observers_, OnOutputVolumeChanged());
 201 }
 202
 203 // TODO: Rename the 'Percent' to something more meaningful.
 204 void CrasAudioHandler::SetInputGainPercent(int gain_percent) {
 205   // NOTE: We do not sanitize input gain values since the range is completely
 206   // dependent on the device.
 207   input_gain_ = gain_percent;
 208
 209   if (const AudioDevice* device = GetDeviceFromId(active_input_node_id_))
 210     audio_pref_handler_->SetVolumeGainValue(*device, input_gain_);
 211
 212   SetInputNodeGain(active_input_node_id_, input_gain_);
 213   FOR_EACH_OBSERVER(AudioObserver, observers_, OnInputGainChanged());
 214 }
 215
 216 void CrasAudioHandler::AdjustOutputVolumeByPercent(int adjust_by_percent) {
 217   SetOutputVolumePercent(output_volume_ + adjust_by_percent);
 218 }
 219
 220 void CrasAudioHandler::SetOutputMute(bool mute_on) {
 221   if (!SetOutputMuteInternal(mute_on))
 222     return;
 223
 224   if (const AudioDevice* device = GetDeviceFromId(active_output_node_id_))
 225     audio_pref_handler_->SetMuteValue(*device, output_mute_on_);
 226
 227   FOR_EACH_OBSERVER(AudioObserver, observers_, OnOutputMuteChanged());
 228 }
 229
 230 void CrasAudioHandler::AdjustOutputVolumeToAudibleLevel() {
 231   if (output_volume_ <= kMuteThresholdPercent) {
 232     // Avoid the situation when sound has been unmuted, but the volume
 233     // is set to a very low value, so user still can't hear any sound.
 234     SetOutputVolumePercent(kDefaultUnmuteVolumePercent);
 235   }
 236 }
 237
 238 void CrasAudioHandler::SetInputMute(bool mute_on) {
 239   if (!SetInputMuteInternal(mute_on))
 240     return;
 241
 242   AudioDevice device;
 243   if (const AudioDevice* device = GetDeviceFromId(active_input_node_id_))
 244     audio_pref_handler_->SetMuteValue(*device, input_mute_on_);
 245
 246
 247   FOR_EACH_OBSERVER(AudioObserver, observers_, OnInputMuteChanged());
 248 }
 249
 250 void CrasAudioHandler::SetActiveOutputNode(uint64 node_id) {
 251   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 252       SetActiveOutputNode(node_id);
 253   FOR_EACH_OBSERVER(AudioObserver, observers_, OnActiveOutputNodeChanged());
 254 }
 255
 256 void CrasAudioHandler::SetActiveInputNode(uint64 node_id) {
 257   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 258       SetActiveInputNode(node_id);
 259   FOR_EACH_OBSERVER(AudioObserver, observers_, OnActiveInputNodeChanged());
 260 }
 261
 262 void CrasAudioHandler::SetVolumeGainPercentForDevice(uint64 device_id,
 263                                                      int value) {
 264   if (device_id == active_output_node_id_) {
 265     SetOutputVolumePercent(value);
 266     return;
 267   } else if (device_id == active_input_node_id_) {
 268     SetInputGainPercent(value);
 269     return;
 270   }
 271
 272   if (const AudioDevice* device = GetDeviceFromId(device_id)) {
 273     if (!device->is_input) {
 274       value = min(max(value, 0), 100);
 275       if (value <= kMuteThresholdPercent)
 276         value = 0;
 277     }
 278     audio_pref_handler_->SetVolumeGainValue(*device, value);
 279   }
 280 }
 281
 282 void CrasAudioHandler::SetMuteForDevice(uint64 device_id, bool mute_on) {
 283   if (device_id == active_output_node_id_) {
 284     SetOutputMute(mute_on);
 285     return;
 286   } else if (device_id == active_input_node_id_) {
 287     SetInputMute(mute_on);
 288     return;
 289   }
 290
 291   AudioDevice device;
 292   if (const AudioDevice* device = GetDeviceFromId(device_id))
 293     audio_pref_handler_->SetMuteValue(*device, mute_on);
 294 }
 295
 296 void CrasAudioHandler::LogErrors() {
 297   log_errors_ = true;
 298 }
 299
 300 CrasAudioHandler::CrasAudioHandler(
 301     scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler)
 302     : audio_pref_handler_(audio_pref_handler),
 303       weak_ptr_factory_(this),
 304       output_mute_on_(false),
 305       input_mute_on_(false),
 306       output_volume_(0),
 307       input_gain_(0),
 308       active_output_node_id_(0),
 309       active_input_node_id_(0),
 310       has_alternative_input_(false),
 311       has_alternative_output_(false),
 312       output_mute_locked_(false),
 313       input_mute_locked_(false),
 314       log_errors_(false) {
 315   if (!audio_pref_handler.get())
 316     return;
 317   // If the DBusThreadManager or the CrasAudioClient aren't available, there
 318   // isn't much we can do. This should only happen when running tests.
 319   if (!chromeos::DBusThreadManager::IsInitialized() ||
 320       !chromeos::DBusThreadManager::Get() ||
 321       !chromeos::DBusThreadManager::Get()->GetCrasAudioClient())
 322     return;
 323   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->AddObserver(this);
 324   audio_pref_handler_->AddAudioPrefObserver(this);
 325   if (chromeos::DBusThreadManager::Get()->GetSessionManagerClient()) {
 326     chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
 327         AddObserver(this);
 328   }
 329   InitializeAudioState();
 330 }
 331
 332 CrasAudioHandler::~CrasAudioHandler() {
 333   if (!chromeos::DBusThreadManager::IsInitialized() ||
 334       !chromeos::DBusThreadManager::Get() ||
 335       !chromeos::DBusThreadManager::Get()->GetCrasAudioClient())
 336     return;
 337   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 338       RemoveObserver(this);
 339   chromeos::DBusThreadManager::Get()->GetSessionManagerClient()->
 340       RemoveObserver(this);
 341   if (audio_pref_handler_.get())
 342     audio_pref_handler_->RemoveAudioPrefObserver(this);
 343   audio_pref_handler_ = NULL;
 344 }
 345
 346 void CrasAudioHandler::AudioClientRestarted() {
 347   // Make sure the logging is enabled in case cras server
 348   // restarts after crashing.
 349   LogErrors();
 350   InitializeAudioState();
 351 }
 352
 353 void CrasAudioHandler::NodesChanged() {
 354   // Refresh audio nodes data.
 355   GetNodes();
 356 }
 357
 358 void CrasAudioHandler::ActiveOutputNodeChanged(uint64 node_id) {
 359   if (active_output_node_id_ == node_id)
 360     return;
 361
 362   // Active audio output device should always be changed by chrome.
 363   // During system boot, cras may change active input to unknown device 0x1,
 364   // we don't need to log it, since it is not an valid device.
 365   if (GetDeviceFromId(node_id)) {
 366     LOG_IF(WARNING, log_errors_)
 367         << "Active output node changed unexpectedly by system node_id="
 368         << "0x" << std::hex << node_id;
 369   }
 370 }
 371
 372 void CrasAudioHandler::ActiveInputNodeChanged(uint64 node_id) {
 373   if (active_input_node_id_ == node_id)
 374     return;
 375
 376   // Active audio input device should always be changed by chrome.
 377   // During system boot, cras may change active input to unknown device 0x2,
 378   // we don't need to log it, since it is not an valid device.
 379   if (GetDeviceFromId(node_id)) {
 380     LOG_IF(WARNING, log_errors_)
 381         << "Active input node changed unexpectedly by system node_id="
 382         << "0x" << std::hex << node_id;
 383   }
 384 }
 385
 386 void CrasAudioHandler::OnAudioPolicyPrefChanged() {
 387   ApplyAudioPolicy();
 388 }
 389
 390 void CrasAudioHandler::EmitLoginPromptVisibleCalled() {
 391   // Enable logging after cras server is started, which will be after
 392   // EmitLoginPromptVisible.
 393   LogErrors();
 394 }
 395
 396 const AudioDevice* CrasAudioHandler::GetDeviceFromId(uint64 device_id) const {
 397   AudioDeviceMap::const_iterator it = audio_devices_.find(device_id);
 398   if (it == audio_devices_.end())
 399     return NULL;
 400
 401   return &(it->second);
 402 }
 403
 404 void CrasAudioHandler::SetupAudioInputState() {
 405   // Set the initial audio state to the ones read from audio prefs.
 406   const AudioDevice* device = GetDeviceFromId(active_input_node_id_);
 407   if (!device) {
 408     LOG_IF(ERROR, log_errors_)
 409         << "Can't set up audio state for unknown input device id ="
 410         << "0x" << std::hex << active_input_node_id_;
 411     return;
 412   }
 413   input_mute_on_ = audio_pref_handler_->GetMuteValue(*device);
 414   input_gain_ = audio_pref_handler_->GetInputGainValue(device);
 415   SetInputMuteInternal(input_mute_on_);
 416   // TODO(rkc,jennyz): Set input gain once we decide on how to store
 417   // the gain values since the range and step are both device specific.
 418 }
 419
 420 void CrasAudioHandler::SetupAudioOutputState() {
 421   const AudioDevice* device = GetDeviceFromId(active_output_node_id_);
 422   if (!device) {
 423     LOG_IF(ERROR, log_errors_)
 424         << "Can't set up audio state for unknown output device id ="
 425         << "0x" << std::hex << active_output_node_id_;
 426     return;
 427   }
 428   output_mute_on_ = audio_pref_handler_->GetMuteValue(*device);
 429   output_volume_ = audio_pref_handler_->GetOutputVolumeValue(device);
 430
 431   SetOutputMuteInternal(output_mute_on_);
 432   SetOutputNodeVolume(active_output_node_id_, output_volume_);
 433 }
 434
 435 void CrasAudioHandler::InitializeAudioState() {
 436   ApplyAudioPolicy();
 437   GetNodes();
 438 }
 439
 440 void CrasAudioHandler::ApplyAudioPolicy() {
 441   output_mute_locked_ = false;
 442   if (!audio_pref_handler_->GetAudioOutputAllowedValue()) {
 443     // Mute the device, but do not update the preference.
 444     SetOutputMuteInternal(true);
 445     output_mute_locked_ = true;
 446   } else {
 447     // Restore the mute state.
 448     const AudioDevice* device = GetDeviceFromId(active_output_node_id_);
 449     if (device)
 450       SetOutputMuteInternal(audio_pref_handler_->GetMuteValue(*device));
 451   }
 452
 453   input_mute_locked_ = false;
 454   if (audio_pref_handler_->GetAudioCaptureAllowedValue()) {
 455     // Set input mute if we have discovered active input device.
 456     const AudioDevice* device = GetDeviceFromId(active_input_node_id_);
 457     if (device)
 458       SetInputMuteInternal(false);
 459   } else {
 460     SetInputMute(true);
 461     input_mute_locked_ = true;
 462   }
 463 }
 464
 465 void CrasAudioHandler::SetOutputNodeVolume(uint64 node_id, int volume) {
 466   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 467       SetOutputNodeVolume(node_id, volume);
 468 }
 469
 470 bool  CrasAudioHandler::SetOutputMuteInternal(bool mute_on) {
 471   if (output_mute_locked_)
 472     return false;
 473
 474   output_mute_on_ = mute_on;
 475   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 476       SetOutputUserMute(mute_on);
 477   return true;
 478 }
 479
 480 void CrasAudioHandler::SetInputNodeGain(uint64 node_id, int gain) {
 481   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 482       SetInputNodeGain(node_id, gain);
 483 }
 484
 485 bool CrasAudioHandler::SetInputMuteInternal(bool mute_on) {
 486   if (input_mute_locked_)
 487     return false;
 488
 489   input_mute_on_ = mute_on;
 490   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->
 491       SetInputMute(mute_on);
 492   return true;
 493 }
 494
 495 void CrasAudioHandler::GetNodes() {
 496   chromeos::DBusThreadManager::Get()->GetCrasAudioClient()->GetNodes(
 497       base::Bind(&CrasAudioHandler::HandleGetNodes,
 498                  weak_ptr_factory_.GetWeakPtr()),
 499       base::Bind(&CrasAudioHandler::HandleGetNodesError,
 500                  weak_ptr_factory_.GetWeakPtr()));
 501 }
 502
 503 bool CrasAudioHandler::ChangeActiveDevice(const AudioDevice& new_active_device,
 504                                           uint64* current_active_node_id) {
 505   // If the device we want to switch to is already the current active device,
 506   // do nothing.
 507   if (new_active_device.active &&
 508       new_active_device.id == *current_active_node_id) {
 509     return false;
 510   }
 511
 512   // Reset all other input or output devices' active status. The active audio
 513   // device from the previous user session can be remembered by cras, but not
 514   // in chrome. see crbug.com/273271.
 515   for (AudioDeviceMap::iterator it = audio_devices_.begin();
 516        it != audio_devices_.end(); ++it) {
 517     if (it->second.is_input == new_active_device.is_input &&
 518         it->second.id != new_active_device.id)
 519       it->second.active = false;
 520   }
 521
 522   // Set the current active input/output device to the new_active_device.
 523   *current_active_node_id = new_active_device.id;
 524   audio_devices_[*current_active_node_id].active = true;
 525   return true;
 526 }
 527
 528 bool CrasAudioHandler::NonActiveDeviceUnplugged(
 529     size_t old_devices_size,
 530     size_t new_devices_size,
 531     uint64 current_active_node) {
 532   return (new_devices_size <= old_devices_size &&
 533           GetDeviceFromId(current_active_node));
 534 }
 535
 536 void CrasAudioHandler::SwitchToDevice(const AudioDevice& device) {
 537   if (device.is_input) {
 538     if (!ChangeActiveDevice(device, &active_input_node_id_))
 539       return;
 540     SetupAudioInputState();
 541     SetActiveInputNode(active_input_node_id_);
 542   } else {
 543     if (!ChangeActiveDevice(device, &active_output_node_id_))
 544       return;
 545     SetupAudioOutputState();
 546     SetActiveOutputNode(active_output_node_id_);
 547   }
 548 }
 549
 550 bool CrasAudioHandler::HasDeviceChange(const AudioNodeList& new_nodes,
 551                                        bool is_input) {
 552   size_t num_old_devices = 0;
 553   size_t num_new_devices = 0;
 554   for (AudioDeviceMap::const_iterator it = audio_devices_.begin();
 555        it != audio_devices_.end(); ++it) {
 556     if (is_input == it->second.is_input)
 557       ++num_old_devices;
 558   }
 559
 560   for (AudioNodeList::const_iterator it = new_nodes.begin();
 561        it != new_nodes.end(); ++it) {
 562     if (is_input == it->is_input) {
 563       ++num_new_devices;
 564       // Look to see if the new device not in the old device list.
 565       AudioDevice device(*it);
 566       if (FoundNewDevice(device))
 567         return true;
 568     }
 569   }
 570   return num_old_devices != num_new_devices;
 571 }
 572
 573 bool CrasAudioHandler::FoundNewDevice(const AudioDevice& device) {
 574   const AudioDevice* device_found = GetDeviceFromId(device.id);
 575   if (!device_found)
 576     return true;
 577
 578   if (!IsSameAudioDevice(device, *device_found)) {
 579     LOG(WARNING) << "Different Audio devices with same id:"
 580         << " new device: " << device.ToString()
 581         << " old device: " << device_found->ToString();
 582     return true;
 583   }
 584   return false;
 585 }
 586
 587 // Sanitize the audio node data. When a device is plugged in or unplugged, there
 588 // should be only one NodesChanged signal from cras. However, we've observed
 589 // the case that multiple NodesChanged signals being sent from cras. After the
 590 // first NodesChanged being processed, chrome sets the active node properly.
 591 // However, the NodesChanged received after the first one, can return stale
 592 // nodes data in GetNodes call, the staled nodes data does not reflect the
 593 // latest active node state. Since active audio node should only be set by
 594 // chrome, the inconsistent data from cras could be the result of stale data
 595 // described above and sanitized.
 596 AudioDevice CrasAudioHandler::GetSanitizedAudioDevice(const AudioNode& node) {
 597   AudioDevice device(node);
 598   if (device.is_input) {
 599     if (device.active && device.id != active_input_node_id_) {
 600       LOG(WARNING) << "Stale audio device data, should not be active: "
 601           << " device = " << device.ToString()
 602           << " current active input node id = 0x" << std::hex
 603           << active_input_node_id_;
 604       device.active = false;
 605     } else if (device.id == active_input_node_id_ && !device.active) {
 606       LOG(WARNING) << "Stale audio device data, should be active:"
 607           << " device = " << device.ToString()
 608           << " current active input node id = 0x" << std::hex
 609           << active_input_node_id_;
 610       device.active = true;
 611     }
 612   } else {
 613     if (device.active && device.id != active_output_node_id_) {
 614       LOG(WARNING) << "Stale audio device data, should not be active: "
 615           << " device = " << device.ToString()
 616           << " current active output node id = 0x" << std::hex
 617           << active_output_node_id_;
 618       device.active = false;
 619     } else if (device.id == active_output_node_id_ && !device.active) {
 620       LOG(WARNING) << "Stale audio device data, should be active:"
 621           << " device = " << device.ToString()
 622           << " current active output node id = 0x" << std::hex
 623           << active_output_node_id_;
 624       device.active = true;
 625     }
 626   }
 627   return device;
 628 }
 629
 630 void CrasAudioHandler::UpdateDevicesAndSwitchActive(
 631     const AudioNodeList& nodes) {
 632   size_t old_audio_devices_size = audio_devices_.size();
 633   bool output_devices_changed = HasDeviceChange(nodes, false);
 634   bool input_devices_changed = HasDeviceChange(nodes, true);
 635   audio_devices_.clear();
 636   has_alternative_input_ = false;
 637   has_alternative_output_ = false;
 638
 639   while (!input_devices_pq_.empty())
 640     input_devices_pq_.pop();
 641   while (!output_devices_pq_.empty())
 642     output_devices_pq_.pop();
 643
 644   for (size_t i = 0; i < nodes.size(); ++i) {
 645     AudioDevice device = GetSanitizedAudioDevice(nodes[i]);
 646     audio_devices_[device.id] = device;
 647
 648     if (!has_alternative_input_ &&
 649         device.is_input &&
 650         device.type != AUDIO_TYPE_INTERNAL_MIC) {
 651       has_alternative_input_ = true;
 652     } else if (!has_alternative_output_ &&
 653                !device.is_input &&
 654                device.type != AUDIO_TYPE_INTERNAL_SPEAKER) {
 655       has_alternative_output_ = true;
 656     }
 657
 658     if (device.is_input)
 659       input_devices_pq_.push(device);
 660     else
 661       output_devices_pq_.push(device);
 662   }
 663
 664   // If audio nodes change is caused by unplugging some non-active audio
 665   // devices, the previously set active audio device will stay active.
 666   // Otherwise, switch to a new active audio device according to their priority.
 667   if (input_devices_changed &&
 668       !NonActiveDeviceUnplugged(old_audio_devices_size,
 669                                 audio_devices_.size(),
 670                                 active_input_node_id_) &&
 671       !input_devices_pq_.empty())
 672     SwitchToDevice(input_devices_pq_.top());
 673   if (output_devices_changed &&
 674       !NonActiveDeviceUnplugged(old_audio_devices_size,
 675                                 audio_devices_.size(),
 676                                 active_output_node_id_) &&
 677       !output_devices_pq_.empty()) {
 678     SwitchToDevice(output_devices_pq_.top());
 679   }
 680 }
 681
 682 void CrasAudioHandler::HandleGetNodes(const chromeos::AudioNodeList& node_list,
 683                                       bool success) {
 684   if (!success) {
 685     LOG_IF(ERROR, log_errors_) << "Failed to retrieve audio nodes data";
 686     return;
 687   }
 688
 689   UpdateDevicesAndSwitchActive(node_list);
 690   FOR_EACH_OBSERVER(AudioObserver, observers_, OnAudioNodesChanged());
 691 }
 692
 693 void CrasAudioHandler::HandleGetNodesError(const std::string& error_name,
 694                                            const std::string& error_msg) {
 695   LOG_IF(ERROR, log_errors_) << "Failed to call GetNodes: "
 696       << error_name  << ": " << error_msg;
 697 }
 698 }  // namespace chromeos