root/content/browser/renderer_host/media/audio_input_device_manager.cc

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DEFINITIONS

This source file includes following definitions.
  1. audio_manager_
  2. GetOpenedDeviceInfoById
  3. Register
  4. Unregister
  5. EnumerateDevices
  6. Open
  7. Close
  8. UseFakeDevice
  9. ShouldUseFakeDevice
  10. EnumerateOnDeviceThread
  11. OpenOnDeviceThread
  12. DevicesEnumeratedOnIOThread
  13. OpenedOnIOThread
  14. ClosedOnIOThread
  15. IsOnDeviceThread
  16. GetDevice

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/renderer_host/media/audio_input_device_manager.h"

#include "base/bind.h"
#include "base/memory/scoped_ptr.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/media_stream_request.h"
#include "media/audio/audio_device_name.h"
#include "media/audio/audio_input_ipc.h"
#include "media/audio/audio_manager_base.h"
#include "media/audio/audio_parameters.h"
#include "media/base/channel_layout.h"
#include "media/base/scoped_histogram_timer.h"

namespace content {

const int AudioInputDeviceManager::kFakeOpenSessionId = 1;

namespace {
// Starting id for the first capture session.
const int kFirstSessionId = AudioInputDeviceManager::kFakeOpenSessionId + 1;
}

AudioInputDeviceManager::AudioInputDeviceManager(
    media::AudioManager* audio_manager)
    : listener_(NULL),
      next_capture_session_id_(kFirstSessionId),
      use_fake_device_(false),
      audio_manager_(audio_manager) {
  // TODO(xians): Remove this fake_device after the unittests do not need it.
  StreamDeviceInfo fake_device(MEDIA_DEVICE_AUDIO_CAPTURE,
                               media::AudioManagerBase::kDefaultDeviceName,
                               media::AudioManagerBase::kDefaultDeviceId,
                               44100, media::CHANNEL_LAYOUT_STEREO,
                               0);
  fake_device.session_id = kFakeOpenSessionId;
  devices_.push_back(fake_device);
}

AudioInputDeviceManager::~AudioInputDeviceManager() {
}

const StreamDeviceInfo* AudioInputDeviceManager::GetOpenedDeviceInfoById(
    int session_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  StreamDeviceList::iterator device = GetDevice(session_id);
  if (device == devices_.end())
    return NULL;

  return &(*device);
}

void AudioInputDeviceManager::Register(
    MediaStreamProviderListener* listener,
    const scoped_refptr<base::SingleThreadTaskRunner>& device_task_runner) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DCHECK(!listener_);
  DCHECK(!device_task_runner_);
  listener_ = listener;
  device_task_runner_ = device_task_runner;
}

void AudioInputDeviceManager::Unregister() {
  DCHECK(listener_);
  listener_ = NULL;
}

void AudioInputDeviceManager::EnumerateDevices(MediaStreamType stream_type) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DCHECK(listener_);

  device_task_runner_->PostTask(
      FROM_HERE,
      base::Bind(&AudioInputDeviceManager::EnumerateOnDeviceThread,
                 this, stream_type));
}

int AudioInputDeviceManager::Open(const StreamDeviceInfo& device) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  // Generate a new id for this device.
  int session_id = next_capture_session_id_++;
  device_task_runner_->PostTask(
      FROM_HERE,
      base::Bind(&AudioInputDeviceManager::OpenOnDeviceThread,
                 this, session_id, device));

  return session_id;
}

void AudioInputDeviceManager::Close(int session_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DCHECK(listener_);
  StreamDeviceList::iterator device = GetDevice(session_id);
  if (device == devices_.end())
    return;
  const MediaStreamType stream_type = device->device.type;
  if (session_id != kFakeOpenSessionId)
    devices_.erase(device);

  // Post a callback through the listener on IO thread since
  // MediaStreamManager is expecting the callback asynchronously.
  BrowserThread::PostTask(BrowserThread::IO,
                          FROM_HERE,
                          base::Bind(&AudioInputDeviceManager::ClosedOnIOThread,
                                     this, stream_type, session_id));
}

void AudioInputDeviceManager::UseFakeDevice() {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  use_fake_device_ = true;
}

bool AudioInputDeviceManager::ShouldUseFakeDevice() const {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  return use_fake_device_;
}

void AudioInputDeviceManager::EnumerateOnDeviceThread(
    MediaStreamType stream_type) {
  SCOPED_UMA_HISTOGRAM_TIMER(
      "Media.AudioInputDeviceManager.EnumerateOnDeviceThreadTime");
  DCHECK(IsOnDeviceThread());

  media::AudioDeviceNames device_names;

  switch (stream_type) {
    case MEDIA_DEVICE_AUDIO_CAPTURE:
      // AudioManager is guaranteed to outlive MediaStreamManager in
      // BrowserMainloop.
      audio_manager_->GetAudioInputDeviceNames(&device_names);
      break;

    default:
      NOTREACHED();
      break;
  }

  scoped_ptr<StreamDeviceInfoArray> devices(new StreamDeviceInfoArray());
  for (media::AudioDeviceNames::iterator it = device_names.begin();
       it != device_names.end(); ++it) {
    // Add device information to device vector.
    devices->push_back(StreamDeviceInfo(
        stream_type, it->device_name, it->unique_id));
  }

  // If the |use_fake_device_| flag is on, inject the fake device if there is
  // no available device on the OS.
  if (use_fake_device_ && devices->empty()) {
    devices->push_back(StreamDeviceInfo(
        stream_type, media::AudioManagerBase::kDefaultDeviceName,
        media::AudioManagerBase::kDefaultDeviceId));
  }

  // Return the device list through the listener by posting a task on
  // IO thread since MediaStreamManager handles the callback asynchronously.
  BrowserThread::PostTask(
      BrowserThread::IO,
      FROM_HERE,
      base::Bind(&AudioInputDeviceManager::DevicesEnumeratedOnIOThread,
                 this, stream_type, base::Passed(&devices)));
}

void AudioInputDeviceManager::OpenOnDeviceThread(
    int session_id, const StreamDeviceInfo& info) {
  SCOPED_UMA_HISTOGRAM_TIMER(
      "Media.AudioInputDeviceManager.OpenOnDeviceThreadTime");
  DCHECK(IsOnDeviceThread());

  StreamDeviceInfo out(info.device.type, info.device.name, info.device.id,
                       0, 0, 0);
  out.session_id = session_id;

  MediaStreamDevice::AudioDeviceParameters& input_params = out.device.input;

  if (use_fake_device_) {
    // Don't need to query the hardware information if using fake device.
    input_params.sample_rate = 44100;
    input_params.channel_layout = media::CHANNEL_LAYOUT_STEREO;
  } else {
    // Get the preferred sample rate and channel configuration for the
    // audio device.
    media::AudioParameters params =
        audio_manager_->GetInputStreamParameters(info.device.id);
    input_params.sample_rate = params.sample_rate();
    input_params.channel_layout = params.channel_layout();
    input_params.frames_per_buffer = params.frames_per_buffer();
    input_params.effects = params.effects();

    // Add preferred output device information if a matching output device
    // exists.
    out.device.matched_output_device_id =
        audio_manager_->GetAssociatedOutputDeviceID(info.device.id);
    if (!out.device.matched_output_device_id.empty()) {
      params = audio_manager_->GetOutputStreamParameters(
          out.device.matched_output_device_id);
      MediaStreamDevice::AudioDeviceParameters& matched_output_params =
          out.device.matched_output;
      matched_output_params.sample_rate = params.sample_rate();
      matched_output_params.channel_layout = params.channel_layout();
      matched_output_params.frames_per_buffer = params.frames_per_buffer();
    }
  }

  // Return the |session_id| through the listener by posting a task on
  // IO thread since MediaStreamManager handles the callback asynchronously.
  BrowserThread::PostTask(BrowserThread::IO,
                          FROM_HERE,
                          base::Bind(&AudioInputDeviceManager::OpenedOnIOThread,
                                     this, session_id, out));
}

void AudioInputDeviceManager::DevicesEnumeratedOnIOThread(
    MediaStreamType stream_type,
    scoped_ptr<StreamDeviceInfoArray> devices) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  // Ensure that |devices| gets deleted on exit.
  if (listener_)
    listener_->DevicesEnumerated(stream_type, *devices);
}

void AudioInputDeviceManager::OpenedOnIOThread(int session_id,
                                               const StreamDeviceInfo& info) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  DCHECK_EQ(session_id, info.session_id);
  DCHECK(GetDevice(session_id) == devices_.end());

  devices_.push_back(info);

  if (listener_)
    listener_->Opened(info.device.type, session_id);
}

void AudioInputDeviceManager::ClosedOnIOThread(MediaStreamType stream_type,
                                               int session_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  if (listener_)
    listener_->Closed(stream_type, session_id);
}

bool AudioInputDeviceManager::IsOnDeviceThread() const {
  return device_task_runner_->BelongsToCurrentThread();
}

AudioInputDeviceManager::StreamDeviceList::iterator
AudioInputDeviceManager::GetDevice(int session_id) {
  for (StreamDeviceList::iterator i(devices_.begin()); i != devices_.end();
       ++i) {
    if (i->session_id == session_id)
      return i;
  }

  return devices_.end();
}

}  // namespace content

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