src/media/audio/audio_input_controller.cc

   1 // Copyright (c) 2012 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 "media/audio/audio_input_controller.h"
   6
   7 #include "base/bind.h"
   8 #include "base/threading/thread_restrictions.h"
   9 #include "media/base/limits.h"
  10 #include "media/base/scoped_histogram_timer.h"
  11 #include "media/base/user_input_monitor.h"
  12
  13 namespace {
  14 const int kMaxInputChannels = 2;
  15
  16 // TODO(henrika): remove usage of timers and add support for proper
  17 // notification of when the input device is removed.  This was originally added
  18 // to resolve http://crbug.com/79936 for Windows platforms.  This then caused
  19 // breakage (very hard to repro bugs!) on other platforms: See
  20 // http://crbug.com/226327 and http://crbug.com/230972.
  21 const int kTimerResetIntervalSeconds = 1;
  22 // We have received reports that the timer can be too trigger happy on some
  23 // Mac devices and the initial timer interval has therefore been increased
  24 // from 1 second to 5 seconds.
  25 const int kTimerInitialIntervalSeconds = 5;
  26 }
  27
  28 namespace media {
  29
  30 // static
  31 AudioInputController::Factory* AudioInputController::factory_ = NULL;
  32
  33 AudioInputController::AudioInputController(EventHandler* handler,
  34                                            SyncWriter* sync_writer,
  35                                            UserInputMonitor* user_input_monitor)
  36     : creator_loop_(base::MessageLoopProxy::current()),
  37       handler_(handler),
  38       stream_(NULL),
  39       data_is_active_(false),
  40       state_(kEmpty),
  41       sync_writer_(sync_writer),
  42       max_volume_(0.0),
  43       user_input_monitor_(user_input_monitor),
  44       prev_key_down_count_(0) {
  45   DCHECK(creator_loop_.get());
  46 }
  47
  48 AudioInputController::~AudioInputController() {
  49   DCHECK(kClosed == state_ || kCreated == state_ || kEmpty == state_);
  50 }
  51
  52 // static
  53 scoped_refptr<AudioInputController> AudioInputController::Create(
  54     AudioManager* audio_manager,
  55     EventHandler* event_handler,
  56     const AudioParameters& params,
  57     const std::string& device_id,
  58     UserInputMonitor* user_input_monitor) {
  59   DCHECK(audio_manager);
  60
  61   if (!params.IsValid() || (params.channels() > kMaxInputChannels))
  62     return NULL;
  63
  64   if (factory_) {
  65     return factory_->Create(
  66         audio_manager, event_handler, params, user_input_monitor);
  67   }
  68   scoped_refptr<AudioInputController> controller(
  69       new AudioInputController(event_handler, NULL, user_input_monitor));
  70
  71   controller->message_loop_ = audio_manager->GetMessageLoop();
  72
  73   // Create and open a new audio input stream from the existing
  74   // audio-device thread.
  75   if (!controller->message_loop_->PostTask(FROM_HERE,
  76           base::Bind(&AudioInputController::DoCreate, controller,
  77                      base::Unretained(audio_manager), params, device_id))) {
  78     controller = NULL;
  79   }
  80
  81   return controller;
  82 }
  83
  84 // static
  85 scoped_refptr<AudioInputController> AudioInputController::CreateLowLatency(
  86     AudioManager* audio_manager,
  87     EventHandler* event_handler,
  88     const AudioParameters& params,
  89     const std::string& device_id,
  90     SyncWriter* sync_writer,
  91     UserInputMonitor* user_input_monitor) {
  92   DCHECK(audio_manager);
  93   DCHECK(sync_writer);
  94
  95   if (!params.IsValid() || (params.channels() > kMaxInputChannels))
  96     return NULL;
  97
  98   // Create the AudioInputController object and ensure that it runs on
  99   // the audio-manager thread.
 100   scoped_refptr<AudioInputController> controller(
 101       new AudioInputController(event_handler, sync_writer, user_input_monitor));
 102   controller->message_loop_ = audio_manager->GetMessageLoop();
 103
 104   // Create and open a new audio input stream from the existing
 105   // audio-device thread. Use the provided audio-input device.
 106   if (!controller->message_loop_->PostTask(FROM_HERE,
 107           base::Bind(&AudioInputController::DoCreate, controller,
 108                      base::Unretained(audio_manager), params, device_id))) {
 109     controller = NULL;
 110   }
 111
 112   return controller;
 113 }
 114
 115 // static
 116 scoped_refptr<AudioInputController> AudioInputController::CreateForStream(
 117     const scoped_refptr<base::MessageLoopProxy>& message_loop,
 118     EventHandler* event_handler,
 119     AudioInputStream* stream,
 120     SyncWriter* sync_writer,
 121     UserInputMonitor* user_input_monitor) {
 122   DCHECK(sync_writer);
 123   DCHECK(stream);
 124
 125   // Create the AudioInputController object and ensure that it runs on
 126   // the audio-manager thread.
 127   scoped_refptr<AudioInputController> controller(
 128       new AudioInputController(event_handler, sync_writer, user_input_monitor));
 129   controller->message_loop_ = message_loop;
 130
 131   // TODO(miu): See TODO at top of file.  Until that's resolved, we need to
 132   // disable the error auto-detection here (since the audio mirroring
 133   // implementation will reliably report error and close events).  Note, of
 134   // course, that we're assuming CreateForStream() has been called for the audio
 135   // mirroring use case only.
 136   if (!controller->message_loop_->PostTask(
 137           FROM_HERE,
 138           base::Bind(&AudioInputController::DoCreateForStream, controller,
 139                      stream, false))) {
 140     controller = NULL;
 141   }
 142
 143   return controller;
 144 }
 145
 146 void AudioInputController::Record() {
 147   message_loop_->PostTask(FROM_HERE, base::Bind(
 148       &AudioInputController::DoRecord, this));
 149 }
 150
 151 void AudioInputController::Close(const base::Closure& closed_task) {
 152   DCHECK(!closed_task.is_null());
 153   DCHECK(creator_loop_->BelongsToCurrentThread());
 154
 155   message_loop_->PostTaskAndReply(
 156       FROM_HERE, base::Bind(&AudioInputController::DoClose, this), closed_task);
 157 }
 158
 159 void AudioInputController::SetVolume(double volume) {
 160   message_loop_->PostTask(FROM_HERE, base::Bind(
 161       &AudioInputController::DoSetVolume, this, volume));
 162 }
 163
 164 void AudioInputController::SetAutomaticGainControl(bool enabled) {
 165   message_loop_->PostTask(FROM_HERE, base::Bind(
 166       &AudioInputController::DoSetAutomaticGainControl, this, enabled));
 167 }
 168
 169 void AudioInputController::DoCreate(AudioManager* audio_manager,
 170                                     const AudioParameters& params,
 171                                     const std::string& device_id) {
 172   DCHECK(message_loop_->BelongsToCurrentThread());
 173   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioInputController.CreateTime");
 174   // TODO(miu): See TODO at top of file.  Until that's resolved, assume all
 175   // platform audio input requires the |no_data_timer_| be used to auto-detect
 176   // errors.  In reality, probably only Windows needs to be treated as
 177   // unreliable here.
 178   DoCreateForStream(audio_manager->MakeAudioInputStream(params, device_id),
 179                     true);
 180 }
 181
 182 void AudioInputController::DoCreateForStream(
 183     AudioInputStream* stream_to_control, bool enable_nodata_timer) {
 184   DCHECK(message_loop_->BelongsToCurrentThread());
 185
 186   DCHECK(!stream_);
 187   stream_ = stream_to_control;
 188
 189   if (!stream_) {
 190     handler_->OnError(this);
 191     return;
 192   }
 193
 194   if (stream_ && !stream_->Open()) {
 195     stream_->Close();
 196     stream_ = NULL;
 197     handler_->OnError(this);
 198     return;
 199   }
 200
 201   DCHECK(!no_data_timer_.get());
 202   if (enable_nodata_timer) {
 203     // Create the data timer which will call DoCheckForNoData(). The timer
 204     // is started in DoRecord() and restarted in each DoCheckForNoData()
 205     // callback.
 206     no_data_timer_.reset(new base::Timer(
 207         FROM_HERE, base::TimeDelta::FromSeconds(kTimerInitialIntervalSeconds),
 208         base::Bind(&AudioInputController::DoCheckForNoData,
 209                    base::Unretained(this)), false));
 210   } else {
 211     DVLOG(1) << "Disabled: timer check for no data.";
 212   }
 213
 214   state_ = kCreated;
 215   handler_->OnCreated(this);
 216
 217   if (user_input_monitor_) {
 218     user_input_monitor_->EnableKeyPressMonitoring();
 219     prev_key_down_count_ = user_input_monitor_->GetKeyPressCount();
 220   }
 221 }
 222
 223 void AudioInputController::DoRecord() {
 224   DCHECK(message_loop_->BelongsToCurrentThread());
 225   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioInputController.RecordTime");
 226
 227   if (state_ != kCreated)
 228     return;
 229
 230   {
 231     base::AutoLock auto_lock(lock_);
 232     state_ = kRecording;
 233   }
 234
 235   if (no_data_timer_) {
 236     // Start the data timer. Once |kTimerResetIntervalSeconds| have passed,
 237     // a callback to DoCheckForNoData() is made.
 238     no_data_timer_->Reset();
 239   }
 240
 241   stream_->Start(this);
 242   handler_->OnRecording(this);
 243 }
 244
 245 void AudioInputController::DoClose() {
 246   DCHECK(message_loop_->BelongsToCurrentThread());
 247   SCOPED_UMA_HISTOGRAM_TIMER("Media.AudioInputController.CloseTime");
 248
 249   // Delete the timer on the same thread that created it.
 250   no_data_timer_.reset();
 251
 252   if (state_ != kClosed) {
 253     DoStopCloseAndClearStream(NULL);
 254     SetDataIsActive(false);
 255
 256     if (LowLatencyMode()) {
 257       sync_writer_->Close();
 258     }
 259
 260     state_ = kClosed;
 261
 262     if (user_input_monitor_)
 263       user_input_monitor_->DisableKeyPressMonitoring();
 264   }
 265 }
 266
 267 void AudioInputController::DoReportError() {
 268   DCHECK(message_loop_->BelongsToCurrentThread());
 269   handler_->OnError(this);
 270 }
 271
 272 void AudioInputController::DoSetVolume(double volume) {
 273   DCHECK(message_loop_->BelongsToCurrentThread());
 274   DCHECK_GE(volume, 0);
 275   DCHECK_LE(volume, 1.0);
 276
 277   if (state_ != kCreated && state_ != kRecording)
 278     return;
 279
 280   // Only ask for the maximum volume at first call and use cached value
 281   // for remaining function calls.
 282   if (!max_volume_) {
 283     max_volume_ = stream_->GetMaxVolume();
 284   }
 285
 286   if (max_volume_ == 0.0) {
 287     DLOG(WARNING) << "Failed to access input volume control";
 288     return;
 289   }
 290
 291   // Set the stream volume and scale to a range matched to the platform.
 292   stream_->SetVolume(max_volume_ * volume);
 293 }
 294
 295 void AudioInputController::DoSetAutomaticGainControl(bool enabled) {
 296   DCHECK(message_loop_->BelongsToCurrentThread());
 297   DCHECK_NE(state_, kRecording);
 298
 299   // Ensure that the AGC state only can be modified before streaming starts.
 300   if (state_ != kCreated || state_ == kRecording)
 301     return;
 302
 303   stream_->SetAutomaticGainControl(enabled);
 304 }
 305
 306 void AudioInputController::DoCheckForNoData() {
 307   DCHECK(message_loop_->BelongsToCurrentThread());
 308
 309   if (!GetDataIsActive()) {
 310     // The data-is-active marker will be false only if it has been more than
 311     // one second since a data packet was recorded. This can happen if a
 312     // capture device has been removed or disabled.
 313     handler_->OnError(this);
 314     return;
 315   }
 316
 317   // Mark data as non-active. The flag will be re-enabled in OnData() each
 318   // time a data packet is received. Hence, under normal conditions, the
 319   // flag will only be disabled during a very short period.
 320   SetDataIsActive(false);
 321
 322   // Restart the timer to ensure that we check the flag again in
 323   // |kTimerResetIntervalSeconds|.
 324   no_data_timer_->Start(
 325       FROM_HERE, base::TimeDelta::FromSeconds(kTimerResetIntervalSeconds),
 326       base::Bind(&AudioInputController::DoCheckForNoData,
 327       base::Unretained(this)));
 328 }
 329
 330 void AudioInputController::OnData(AudioInputStream* stream,
 331                                   const uint8* data,
 332                                   uint32 size,
 333                                   uint32 hardware_delay_bytes,
 334                                   double volume) {
 335   {
 336     base::AutoLock auto_lock(lock_);
 337     if (state_ != kRecording)
 338       return;
 339   }
 340
 341   bool key_pressed = false;
 342   if (user_input_monitor_) {
 343     size_t current_count = user_input_monitor_->GetKeyPressCount();
 344     key_pressed = current_count != prev_key_down_count_;
 345     prev_key_down_count_ = current_count;
 346     DVLOG_IF(6, key_pressed) << "Detected keypress.";
 347   }
 348
 349   // Mark data as active to ensure that the periodic calls to
 350   // DoCheckForNoData() does not report an error to the event handler.
 351   SetDataIsActive(true);
 352
 353   // Use SyncSocket if we are in a low-latency mode.
 354   if (LowLatencyMode()) {
 355     sync_writer_->Write(data, size, volume, key_pressed);
 356     sync_writer_->UpdateRecordedBytes(hardware_delay_bytes);
 357     return;
 358   }
 359
 360   handler_->OnData(this, data, size);
 361 }
 362
 363 void AudioInputController::OnClose(AudioInputStream* stream) {
 364   DVLOG(1) << "AudioInputController::OnClose()";
 365   // TODO(satish): Sometimes the device driver closes the input stream without
 366   // us asking for it (may be if the device was unplugged?). Check how to handle
 367   // such cases here.
 368 }
 369
 370 void AudioInputController::OnError(AudioInputStream* stream) {
 371   // Handle error on the audio-manager thread.
 372   message_loop_->PostTask(FROM_HERE, base::Bind(
 373       &AudioInputController::DoReportError, this));
 374 }
 375
 376 void AudioInputController::DoStopCloseAndClearStream(
 377     base::WaitableEvent* done) {
 378   DCHECK(message_loop_->BelongsToCurrentThread());
 379
 380   // Allow calling unconditionally and bail if we don't have a stream to close.
 381   if (stream_ != NULL) {
 382     stream_->Stop();
 383     stream_->Close();
 384     stream_ = NULL;
 385   }
 386
 387   // Should be last in the method, do not touch "this" from here on.
 388   if (done != NULL)
 389     done->Signal();
 390 }
 391
 392 void AudioInputController::SetDataIsActive(bool enabled) {
 393   base::subtle::Release_Store(&data_is_active_, enabled);
 394 }
 395
 396 bool AudioInputController::GetDataIsActive() {
 397   return (base::subtle::Acquire_Load(&data_is_active_) != false);
 398 }
 399
 400 }  // namespace media