media/audio/audio_manager_base.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_manager_base.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/command_line.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/thread_task_runner_handle.h"
  13 #include "build/build_config.h"
  14 #include "media/audio/audio_output_dispatcher_impl.h"
  15 #include "media/audio/audio_output_proxy.h"
  16 #include "media/audio/audio_output_resampler.h"
  17 #include "media/audio/fake_audio_input_stream.h"
  18 #include "media/audio/fake_audio_output_stream.h"
  19 #include "media/base/media_switches.h"
  20
  21 namespace media {
  22
  23 static const int kStreamCloseDelaySeconds = 5;
  24
  25 // Default maximum number of output streams that can be open simultaneously
  26 // for all platforms.
  27 static const int kDefaultMaxOutputStreams = 16;
  28
  29 // Default maximum number of input streams that can be open simultaneously
  30 // for all platforms.
  31 static const int kDefaultMaxInputStreams = 16;
  32
  33 static const int kMaxInputChannels = 3;
  34
  35 const char AudioManagerBase::kDefaultDeviceName[] = "Default";
  36 const char AudioManagerBase::kDefaultDeviceId[] = "default";
  37 const char AudioManagerBase::kLoopbackInputDeviceId[] = "loopback";
  38
  39 struct AudioManagerBase::DispatcherParams {
  40   DispatcherParams(const AudioParameters& input,
  41                    const AudioParameters& output,
  42                    const std::string& output_device_id)
  43       : input_params(input),
  44         output_params(output),
  45         output_device_id(output_device_id) {}
  46   ~DispatcherParams() {}
  47
  48   const AudioParameters input_params;
  49   const AudioParameters output_params;
  50   const std::string output_device_id;
  51   scoped_refptr<AudioOutputDispatcher> dispatcher;
  52
  53  private:
  54   DISALLOW_COPY_AND_ASSIGN(DispatcherParams);
  55 };
  56
  57 class AudioManagerBase::CompareByParams {
  58  public:
  59   explicit CompareByParams(const DispatcherParams* dispatcher)
  60       : dispatcher_(dispatcher) {}
  61   bool operator()(DispatcherParams* dispatcher_in) const {
  62     // We will reuse the existing dispatcher when:
  63     // 1) Unified IO is not used, input_params and output_params of the
  64     //    existing dispatcher are the same as the requested dispatcher.
  65     // 2) Unified IO is used, input_params and output_params of the existing
  66     //    dispatcher are the same as the request dispatcher.
  67     return (dispatcher_->input_params.Equals(dispatcher_in->input_params) &&
  68             dispatcher_->output_params.Equals(dispatcher_in->output_params) &&
  69             dispatcher_->output_device_id == dispatcher_in->output_device_id);
  70   }
  71
  72  private:
  73   const DispatcherParams* dispatcher_;
  74 };
  75
  76 AudioManagerBase::AudioManagerBase(AudioLogFactory* audio_log_factory)
  77     : max_num_output_streams_(kDefaultMaxOutputStreams),
  78       max_num_input_streams_(kDefaultMaxInputStreams),
  79       num_output_streams_(0),
  80       num_input_streams_(0),
  81       // TODO(dalecurtis): Switch this to an base::ObserverListThreadSafe, so we
  82       // don't
  83       // block the UI thread when swapping devices.
  84       output_listeners_(
  85           base::ObserverList<AudioDeviceListener>::NOTIFY_EXISTING_ONLY),
  86       audio_thread_("AudioThread"),
  87       audio_log_factory_(audio_log_factory) {
  88 #if defined(OS_WIN)
  89   audio_thread_.init_com_with_mta(true);
  90 #elif defined(OS_MACOSX)
  91   // CoreAudio calls must occur on the main thread of the process, which in our
  92   // case is sadly the browser UI thread.  Failure to execute calls on the right
  93   // thread leads to crashes and odd behavior.  See http://crbug.com/158170.
  94   // TODO(dalecurtis): We should require the message loop to be passed in.
  95   if (base::MessageLoopForUI::IsCurrent()) {
  96     task_runner_ = base::ThreadTaskRunnerHandle::Get();
  97     return;
  98   }
  99 #endif
 100
 101   CHECK(audio_thread_.Start());
 102   task_runner_ = audio_thread_.message_loop_proxy();
 103 }
 104
 105 AudioManagerBase::~AudioManagerBase() {
 106   // The platform specific AudioManager implementation must have already
 107   // stopped the audio thread. Otherwise, we may destroy audio streams before
 108   // stopping the thread, resulting an unexpected behavior.
 109   // This way we make sure activities of the audio streams are all stopped
 110   // before we destroy them.
 111   CHECK(!audio_thread_.IsRunning());
 112   // All the output streams should have been deleted.
 113   DCHECK_EQ(0, num_output_streams_);
 114   // All the input streams should have been deleted.
 115   DCHECK_EQ(0, num_input_streams_);
 116 }
 117
 118 base::string16 AudioManagerBase::GetAudioInputDeviceModel() {
 119   return base::string16();
 120 }
 121
 122 scoped_refptr<base::SingleThreadTaskRunner> AudioManagerBase::GetTaskRunner() {
 123   return task_runner_;
 124 }
 125
 126 scoped_refptr<base::SingleThreadTaskRunner>
 127 AudioManagerBase::GetWorkerTaskRunner() {
 128   // Lazily start the worker thread.
 129   if (!audio_thread_.IsRunning())
 130     CHECK(audio_thread_.Start());
 131
 132   return audio_thread_.message_loop_proxy();
 133 }
 134
 135 AudioOutputStream* AudioManagerBase::MakeAudioOutputStream(
 136     const AudioParameters& params,
 137     const std::string& device_id) {
 138   // TODO(miu): Fix ~50 call points across several unit test modules to call
 139   // this method on the audio thread, then uncomment the following:
 140   // DCHECK(task_runner_->BelongsToCurrentThread());
 141
 142   if (!params.IsValid()) {
 143     DLOG(ERROR) << "Audio parameters are invalid";
 144     return NULL;
 145   }
 146
 147   // Limit the number of audio streams opened. This is to prevent using
 148   // excessive resources for a large number of audio streams. More
 149   // importantly it prevents instability on certain systems.
 150   // See bug: http://crbug.com/30242.
 151   if (num_output_streams_ >= max_num_output_streams_) {
 152     DLOG(ERROR) << "Number of opened output audio streams "
 153                 << num_output_streams_
 154                 << " exceed the max allowed number "
 155                 << max_num_output_streams_;
 156     return NULL;
 157   }
 158
 159   AudioOutputStream* stream;
 160   switch (params.format()) {
 161     case AudioParameters::AUDIO_PCM_LINEAR:
 162       DCHECK(device_id.empty())
 163           << "AUDIO_PCM_LINEAR supports only the default device.";
 164       stream = MakeLinearOutputStream(params);
 165       break;
 166     case AudioParameters::AUDIO_PCM_LOW_LATENCY:
 167       stream = MakeLowLatencyOutputStream(params, device_id);
 168       break;
 169     case AudioParameters::AUDIO_FAKE:
 170       stream = FakeAudioOutputStream::MakeFakeStream(this, params);
 171       break;
 172     default:
 173       stream = NULL;
 174       break;
 175   }
 176
 177   if (stream) {
 178     ++num_output_streams_;
 179   }
 180
 181   return stream;
 182 }
 183
 184 AudioInputStream* AudioManagerBase::MakeAudioInputStream(
 185     const AudioParameters& params,
 186     const std::string& device_id) {
 187   // TODO(miu): Fix ~20 call points across several unit test modules to call
 188   // this method on the audio thread, then uncomment the following:
 189   // DCHECK(task_runner_->BelongsToCurrentThread());
 190
 191   if (!params.IsValid() || (params.channels() > kMaxInputChannels) ||
 192       device_id.empty()) {
 193     DLOG(ERROR) << "Audio parameters are invalid for device " << device_id;
 194     return NULL;
 195   }
 196
 197   if (num_input_streams_ >= max_num_input_streams_) {
 198     DLOG(ERROR) << "Number of opened input audio streams "
 199                 << num_input_streams_
 200                 << " exceed the max allowed number " << max_num_input_streams_;
 201     return NULL;
 202   }
 203
 204   DVLOG(2) << "Creating a new AudioInputStream with buffer size = "
 205            << params.frames_per_buffer();
 206
 207   AudioInputStream* stream;
 208   switch (params.format()) {
 209     case AudioParameters::AUDIO_PCM_LINEAR:
 210       stream = MakeLinearInputStream(params, device_id);
 211       break;
 212     case AudioParameters::AUDIO_PCM_LOW_LATENCY:
 213       stream = MakeLowLatencyInputStream(params, device_id);
 214       break;
 215     case AudioParameters::AUDIO_FAKE:
 216       stream = FakeAudioInputStream::MakeFakeStream(this, params);
 217       break;
 218     default:
 219       stream = NULL;
 220       break;
 221   }
 222
 223   if (stream) {
 224     ++num_input_streams_;
 225   }
 226
 227   return stream;
 228 }
 229
 230 AudioOutputStream* AudioManagerBase::MakeAudioOutputStreamProxy(
 231     const AudioParameters& params,
 232     const std::string& device_id) {
 233   DCHECK(task_runner_->BelongsToCurrentThread());
 234
 235   // If the caller supplied an empty device id to select the default device,
 236   // we fetch the actual device id of the default device so that the lookup
 237   // will find the correct device regardless of whether it was opened as
 238   // "default" or via the specific id.
 239   // NOTE: Implementations that don't yet support opening non-default output
 240   // devices may return an empty string from GetDefaultOutputDeviceID().
 241   std::string output_device_id = device_id.empty() ?
 242       GetDefaultOutputDeviceID() : device_id;
 243
 244   // If we're not using AudioOutputResampler our output parameters are the same
 245   // as our input parameters.
 246   AudioParameters output_params = params;
 247   if (params.format() == AudioParameters::AUDIO_PCM_LOW_LATENCY) {
 248     output_params =
 249         GetPreferredOutputStreamParameters(output_device_id, params);
 250
 251     // Ensure we only pass on valid output parameters.
 252     if (!output_params.IsValid()) {
 253       // We've received invalid audio output parameters, so switch to a mock
 254       // output device based on the input parameters.  This may happen if the OS
 255       // provided us junk values for the hardware configuration.
 256       LOG(ERROR) << "Invalid audio output parameters received; using fake "
 257                  << "audio path. Channels: " << output_params.channels() << ", "
 258                  << "Sample Rate: " << output_params.sample_rate() << ", "
 259                  << "Bits Per Sample: " << output_params.bits_per_sample()
 260                  << ", Frames Per Buffer: "
 261                  << output_params.frames_per_buffer();
 262
 263       // Tell the AudioManager to create a fake output device.
 264       output_params = AudioParameters(
 265           AudioParameters::AUDIO_FAKE, params.channel_layout(),
 266           params.sample_rate(), params.bits_per_sample(),
 267           params.frames_per_buffer());
 268     }
 269   }
 270
 271   DispatcherParams* dispatcher_params =
 272       new DispatcherParams(params, output_params, output_device_id);
 273
 274   AudioOutputDispatchers::iterator it =
 275       std::find_if(output_dispatchers_.begin(), output_dispatchers_.end(),
 276                    CompareByParams(dispatcher_params));
 277   if (it != output_dispatchers_.end()) {
 278     delete dispatcher_params;
 279     return new AudioOutputProxy((*it)->dispatcher.get());
 280   }
 281
 282   const base::TimeDelta kCloseDelay =
 283       base::TimeDelta::FromSeconds(kStreamCloseDelaySeconds);
 284   scoped_refptr<AudioOutputDispatcher> dispatcher;
 285   if (output_params.format() != AudioParameters::AUDIO_FAKE) {
 286     dispatcher = new AudioOutputResampler(this, params, output_params,
 287                                           output_device_id,
 288                                           kCloseDelay);
 289   } else {
 290     dispatcher = new AudioOutputDispatcherImpl(this, output_params,
 291                                                output_device_id,
 292                                                kCloseDelay);
 293   }
 294
 295   dispatcher_params->dispatcher = dispatcher;
 296   output_dispatchers_.push_back(dispatcher_params);
 297   return new AudioOutputProxy(dispatcher.get());
 298 }
 299
 300 void AudioManagerBase::ShowAudioInputSettings() {
 301 }
 302
 303 void AudioManagerBase::GetAudioInputDeviceNames(
 304     AudioDeviceNames* device_names) {
 305 }
 306
 307 void AudioManagerBase::GetAudioOutputDeviceNames(
 308     AudioDeviceNames* device_names) {
 309 }
 310
 311 void AudioManagerBase::ReleaseOutputStream(AudioOutputStream* stream) {
 312   DCHECK(stream);
 313   // TODO(xians) : Have a clearer destruction path for the AudioOutputStream.
 314   // For example, pass the ownership to AudioManager so it can delete the
 315   // streams.
 316   --num_output_streams_;
 317   delete stream;
 318 }
 319
 320 void AudioManagerBase::ReleaseInputStream(AudioInputStream* stream) {
 321   DCHECK(stream);
 322   // TODO(xians) : Have a clearer destruction path for the AudioInputStream.
 323   --num_input_streams_;
 324   delete stream;
 325 }
 326
 327 void AudioManagerBase::Shutdown() {
 328   // Only true when we're sharing the UI message loop with the browser.  The UI
 329   // loop is no longer running at this time and browser destruction is imminent.
 330   if (task_runner_->BelongsToCurrentThread()) {
 331     ShutdownOnAudioThread();
 332   } else {
 333     task_runner_->PostTask(FROM_HERE, base::Bind(
 334         &AudioManagerBase::ShutdownOnAudioThread, base::Unretained(this)));
 335   }
 336
 337   // Stop() will wait for any posted messages to be processed first.
 338   audio_thread_.Stop();
 339 }
 340
 341 void AudioManagerBase::ShutdownOnAudioThread() {
 342   DCHECK(task_runner_->BelongsToCurrentThread());
 343   while (!output_dispatchers_.empty()) {
 344     output_dispatchers_.back()->dispatcher->Shutdown();
 345     output_dispatchers_.pop_back();
 346   }
 347 }
 348
 349 void AudioManagerBase::AddOutputDeviceChangeListener(
 350     AudioDeviceListener* listener) {
 351   DCHECK(task_runner_->BelongsToCurrentThread());
 352   output_listeners_.AddObserver(listener);
 353 }
 354
 355 void AudioManagerBase::RemoveOutputDeviceChangeListener(
 356     AudioDeviceListener* listener) {
 357   DCHECK(task_runner_->BelongsToCurrentThread());
 358   output_listeners_.RemoveObserver(listener);
 359 }
 360
 361 void AudioManagerBase::NotifyAllOutputDeviceChangeListeners() {
 362   DCHECK(task_runner_->BelongsToCurrentThread());
 363   DVLOG(1) << "Firing OnDeviceChange() notifications.";
 364   FOR_EACH_OBSERVER(AudioDeviceListener, output_listeners_, OnDeviceChange());
 365 }
 366
 367 AudioParameters AudioManagerBase::GetDefaultOutputStreamParameters() {
 368   return GetPreferredOutputStreamParameters(GetDefaultOutputDeviceID(),
 369       AudioParameters());
 370 }
 371
 372 AudioParameters AudioManagerBase::GetOutputStreamParameters(
 373     const std::string& device_id) {
 374   return GetPreferredOutputStreamParameters(device_id,
 375       AudioParameters());
 376 }
 377
 378 AudioParameters AudioManagerBase::GetInputStreamParameters(
 379     const std::string& device_id) {
 380   NOTREACHED();
 381   return AudioParameters();
 382 }
 383
 384 std::string AudioManagerBase::GetAssociatedOutputDeviceID(
 385     const std::string& input_device_id) {
 386   return "";
 387 }
 388
 389 std::string AudioManagerBase::GetDefaultOutputDeviceID() {
 390   return "";
 391 }
 392
 393 int AudioManagerBase::GetUserBufferSize() {
 394   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
 395   int buffer_size = 0;
 396   std::string buffer_size_str(cmd_line->GetSwitchValueASCII(
 397       switches::kAudioBufferSize));
 398   if (base::StringToInt(buffer_size_str, &buffer_size) && buffer_size > 0)
 399     return buffer_size;
 400
 401   return 0;
 402 }
 403
 404 scoped_ptr<AudioLog> AudioManagerBase::CreateAudioLog(
 405     AudioLogFactory::AudioComponent component) {
 406   return audio_log_factory_->CreateAudioLog(component);
 407 }
 408
 409 void AudioManagerBase::SetHasKeyboardMic() {
 410   NOTREACHED();
 411 }
 412
 413 }  // namespace media