DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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Mercurial (23d4ebd5f8e7)

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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "MediaManager.h"

#include "AudioDeviceInfo.h"
#include "MediaStreamGraphImpl.h"
#include "MediaTimer.h"
#include "mozilla/dom/MediaStreamTrack.h"
#include "mozilla/dom/MediaDeviceInfo.h"
#include "MediaStreamListener.h"
#include "nsArray.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsHashPropertyBag.h"
#include "nsIEventTarget.h"
#include "nsIUUIDGenerator.h"
#include "nsIScriptGlobalObject.h"
#include "nsIPermissionManager.h"
#include "nsIDocShell.h"
#include "mozilla/dom/Document.h"
#include "nsISupportsPrimitives.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIIDNService.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsICryptoHash.h"
#include "nsICryptoHMAC.h"
#include "nsIKeyModule.h"
#include "nsAppDirectoryServiceDefs.h"
#include "nsIInputStream.h"
#include "nsILineInputStream.h"
#include "nsIWeakReferenceUtils.h"
#include "nsPIDOMWindow.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/MozPromise.h"
#include "mozilla/NullPrincipal.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Types.h"
#include "mozilla/PeerIdentity.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/FeaturePolicyUtils.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MediaStreamBinding.h"
#include "mozilla/dom/MediaStreamTrackBinding.h"
#include "mozilla/dom/GetUserMediaRequestBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/MediaDevices.h"
#include "mozilla/Base64.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/media/MediaChild.h"
#include "mozilla/media/MediaTaskUtils.h"
#include "MediaTrackConstraints.h"
#include "VideoUtils.h"
#include "ThreadSafeRefcountingWithMainThreadDestruction.h"
#include "nsProxyRelease.h"
#include "nsVariant.h"

// For snprintf
#include "mozilla/Sprintf.h"

#include "nsJSUtils.h"
#include "nsGlobalWindow.h"
#include "nsIUUIDGenerator.h"
#include "nspr.h"
#include "nss.h"
#include "pk11pub.h"

/* Using WebRTC backend on Desktops (Mac, Windows, Linux), otherwise default */
#include "MediaEngineDefault.h"
#if defined(MOZ_WEBRTC)
#  include "MediaEngineWebRTC.h"
#  include "browser_logging/WebRtcLog.h"
#  include "webrtc/modules/audio_processing/include/audio_processing.h"
#endif

#if defined(XP_WIN)
#  include "mozilla/WindowsVersion.h"
#  include <objbase.h>
#  include <winsock2.h>
#  include <iphlpapi.h>
#  include <tchar.h>
#endif

// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
// GetTickCount() and conflicts with MediaStream::GetCurrentTime.
#ifdef GetCurrentTime
#  undef GetCurrentTime
#endif

// XXX Workaround for bug 986974 to maintain the existing broken semantics
template <>
struct nsIMediaDevice::COMTypeInfo<mozilla::MediaDevice, void> {
  static const nsIID kIID;
};
const nsIID nsIMediaDevice::COMTypeInfo<mozilla::MediaDevice, void>::kIID =
    NS_IMEDIADEVICE_IID;

// A specialization of nsMainThreadPtrHolder for
// mozilla::dom::CallbackObjectHolder.  See documentation for
// nsMainThreadPtrHolder in nsProxyRelease.h.  This specialization lets us avoid
// wrapping the CallbackObjectHolder into a separate refcounted object.
template <class WebIDLCallbackT, class XPCOMCallbackT>
class nsMainThreadPtrHolder<
    mozilla::dom::CallbackObjectHolder<WebIDLCallbackT, XPCOMCallbackT>>
    final {
  typedef mozilla::dom::CallbackObjectHolder<WebIDLCallbackT, XPCOMCallbackT>
      Holder;

 public:
  nsMainThreadPtrHolder(const char* aName, Holder&& aHolder)
      : mHolder(std::move(aHolder))
#ifndef RELEASE_OR_BETA
        ,
        mName(aName)
#endif
  {
    MOZ_ASSERT(NS_IsMainThread());
  }

 private:
  // We can be released on any thread.
  ~nsMainThreadPtrHolder() {
    if (NS_IsMainThread()) {
      mHolder.Reset();
    } else if (mHolder.GetISupports()) {
      nsCOMPtr<nsIEventTarget> target = do_GetMainThread();
      MOZ_ASSERT(target);
      NS_ProxyRelease(
#ifdef RELEASE_OR_BETA
          nullptr,
#else
          mName,
#endif
          target, mHolder.Forget());
    }
  }

 public:
  Holder* get() {
    // Nobody should be touching the raw pointer off-main-thread.
    if (MOZ_UNLIKELY(!NS_IsMainThread())) {
      NS_ERROR("Can't dereference nsMainThreadPtrHolder off main thread");
      MOZ_CRASH();
    }
    return &mHolder;
  }

  bool operator!() const { return !mHolder; }

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(nsMainThreadPtrHolder<Holder>)

 private:
  // Our holder.
  Holder mHolder;

#ifndef RELEASE_OR_BETA
  const char* mName = nullptr;
#endif

  // Copy constructor and operator= not implemented. Once constructed, the
  // holder is immutable.
  Holder& operator=(const nsMainThreadPtrHolder& aOther) = delete;
  nsMainThreadPtrHolder(const nsMainThreadPtrHolder& aOther) = delete;
};

namespace mozilla {

#ifdef LOG
#  undef LOG
#endif

LazyLogModule gMediaManagerLog("MediaManager");
#define LOG(...) MOZ_LOG(gMediaManagerLog, LogLevel::Debug, (__VA_ARGS__))

using dom::BasicTrackSource;
using dom::CallerType;
using dom::ConstrainDOMStringParameters;
using dom::ConstrainDoubleRange;
using dom::ConstrainLongRange;
using dom::DisplayMediaStreamConstraints;
using dom::Document;
using dom::FeaturePolicyUtils;
using dom::File;
using dom::GetUserMediaRequest;
using dom::MediaDeviceKind;
using dom::MediaDevices;
using dom::MediaSourceEnum;
using dom::MediaStreamConstraints;
using dom::MediaStreamError;
using dom::MediaStreamTrack;
using dom::MediaStreamTrackSource;
using dom::MediaTrackConstraints;
using dom::MediaTrackConstraintSet;
using dom::MediaTrackSettings;
using dom::MozGetUserMediaDevicesSuccessCallback;
using dom::OwningBooleanOrMediaTrackConstraints;
using dom::OwningStringOrStringSequence;
using dom::OwningStringOrStringSequenceOrConstrainDOMStringParameters;
using dom::Promise;
using dom::Sequence;
using media::NewRunnableFrom;
using media::NewTaskFrom;
using media::Refcountable;

static Atomic<bool> sHasShutdown;

struct DeviceState {
  DeviceState(RefPtr<MediaDevice> aDevice, bool aOffWhileDisabled)
      : mOffWhileDisabled(aOffWhileDisabled), mDevice(std::move(aDevice)) {
    MOZ_ASSERT(mDevice);
  }

  // true if we have stopped mDevice, this is a terminal state.
  // MainThread only.
  bool mStopped = false;

  // true if mDevice is currently enabled, i.e., turned on and capturing.
  // MainThread only.
  bool mDeviceEnabled = false;

  // true if the application has currently enabled mDevice.
  // MainThread only.
  bool mTrackEnabled = false;

  // Time when the application last enabled mDevice.
  // MainThread only.
  TimeStamp mTrackEnabledTime;

  // true if an operation to Start() or Stop() mDevice has been dispatched to
  // the media thread and is not finished yet.
  // MainThread only.
  bool mOperationInProgress = false;

  // true if we are allowed to turn off the underlying source while all tracks
  // are disabled.
  // MainThread only.
  bool mOffWhileDisabled = false;

  // Timer triggered by a MediaStreamTrackSource signaling that all tracks got
  // disabled. When the timer fires we initiate Stop()ing mDevice.
  // If set we allow dynamically stopping and starting mDevice.
  // Any thread.
  const RefPtr<MediaTimer> mDisableTimer = new MediaTimer();

  // The underlying device we keep state for. Always non-null.
  // Threadsafe access, but see method declarations for individual constraints.
  const RefPtr<MediaDevice> mDevice;
};

/**
 * This mimics the capture state from nsIMediaManagerService.
 */
enum class CaptureState : uint16_t {
  Off = nsIMediaManagerService::STATE_NOCAPTURE,
  Enabled = nsIMediaManagerService::STATE_CAPTURE_ENABLED,
  Disabled = nsIMediaManagerService::STATE_CAPTURE_DISABLED,
};

static CaptureState CombineCaptureState(CaptureState aFirst,
                                        CaptureState aSecond) {
  if (aFirst == CaptureState::Enabled || aSecond == CaptureState::Enabled) {
    return CaptureState::Enabled;
  }
  if (aFirst == CaptureState::Disabled || aSecond == CaptureState::Disabled) {
    return CaptureState::Disabled;
  }
  MOZ_ASSERT(aFirst == CaptureState::Off);
  MOZ_ASSERT(aSecond == CaptureState::Off);
  return CaptureState::Off;
}

static uint16_t FromCaptureState(CaptureState aState) {
  MOZ_ASSERT(aState == CaptureState::Off || aState == CaptureState::Enabled ||
             aState == CaptureState::Disabled);
  return static_cast<uint16_t>(aState);
}

void MediaManager::CallOnError(GetUserMediaErrorCallback& aCallback,
                               MediaStreamError& aError) {
  aCallback.Call(aError);
}

void MediaManager::CallOnSuccess(GetUserMediaSuccessCallback& aCallback,
                                 DOMMediaStream& aStream) {
  aCallback.Call(aStream);
}

/**
 * SourceListener has threadsafe refcounting for use across the main, media and
 * MSG threads. But it has a non-threadsafe SupportsWeakPtr for WeakPtr usage
 * only from main thread, to ensure that garbage- and cycle-collected objects
 * don't hold a reference to it during late shutdown.
 */
class SourceListener : public SupportsWeakPtr<SourceListener> {
 public:
  typedef MozPromise<bool /* aIgnored */, RefPtr<MediaMgrError>, true>
      SourceListenerPromise;

  MOZ_DECLARE_WEAKREFERENCE_TYPENAME(SourceListener)
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_MAIN_THREAD_DESTRUCTION_AND_RECORDING(
      SourceListener, recordreplay::Behavior::Preserve)

  SourceListener();

  /**
   * Registers this source listener as belonging to the given window listener.
   */
  void Register(GetUserMediaWindowListener* aListener);

  /**
   * Marks this listener as active and adds itself as a listener to aStream.
   */
  void Activate(RefPtr<SourceMediaStream> aStream,
                RefPtr<MediaDevice> aAudioDevice,
                RefPtr<MediaDevice> aVideoDevice);

  /**
   * Posts a task to initialize and start all associated devices.
   */
  RefPtr<SourceListenerPromise> InitializeAsync();

  /**
   * Stops all live tracks, finishes the associated MediaStream and cleans up
   * the weak reference to the associated window listener.
   * This will also tell the window listener to remove its hard reference to
   * this SourceListener, so any caller will need to keep its own hard ref.
   */
  void Stop();

  /**
   * Posts a task to stop the device associated with aTrackID and notifies the
   * associated window listener that a track was stopped.
   * Should this track be the last live one to be stopped, we'll also call Stop.
   * This might tell the window listener to remove its hard reference to this
   * SourceListener, so any caller will need to keep its own hard ref.
   */
  void StopTrack(TrackID aTrackID);

  /**
   * Gets the main thread MediaTrackSettings from the MediaEngineSource
   * associated with aTrackID.
   */
  void GetSettingsFor(TrackID aTrackID, MediaTrackSettings& aOutSettings) const;

  /**
   * Posts a task to set the enabled state of the device associated with
   * aTrackID to aEnabled and notifies the associated window listener that a
   * track's state has changed.
   *
   * Turning the hardware off while the device is disabled is supported for:
   * - Camera (enabled by default, controlled by pref
   *   "media.getusermedia.camera.off_while_disabled.enabled")
   * - Microphone (disabled by default, controlled by pref
   *   "media.getusermedia.microphone.off_while_disabled.enabled")
   * Screen-, app-, or windowsharing is not supported at this time.
   *
   * The behavior is also different between disabling and enabling a device.
   * While enabling is immediate, disabling only happens after a delay.
   * This is now defaulting to 3 seconds but can be overriden by prefs:
   * - "media.getusermedia.camera.off_while_disabled.delay_ms" and
   * - "media.getusermedia.microphone.off_while_disabled.delay_ms".
   *
   * The delay is in place to prevent misuse by malicious sites. If a track is
   * re-enabled before the delay has passed, the device will not be touched
   * until another disable followed by the full delay happens.
   */
  void SetEnabledFor(TrackID aTrackID, bool aEnabled);

  /**
   * Stops all screen/app/window/audioCapture sharing, but not camera or
   * microphone.
   */
  void StopSharing();

  MediaStream* Stream() const { return mStream; }

  SourceMediaStream* GetSourceStream();

  MediaDevice* GetAudioDevice() const {
    return mAudioDeviceState ? mAudioDeviceState->mDevice.get() : nullptr;
  }

  MediaDevice* GetVideoDevice() const {
    return mVideoDeviceState ? mVideoDeviceState->mDevice.get() : nullptr;
  }

  bool Activated() const { return mStream; }

  bool Stopped() const { return mStopped; }

  bool CapturingVideo() const;

  bool CapturingAudio() const;

  CaptureState CapturingSource(MediaSourceEnum aSource) const;

  RefPtr<SourceListenerPromise> ApplyConstraintsToTrack(
      TrackID aTrackID, const MediaTrackConstraints& aConstraints,
      CallerType aCallerType);

  PrincipalHandle GetPrincipalHandle() const;

 private:
  virtual ~SourceListener() = default;

  /**
   * Returns a pointer to the device state for aTrackID.
   *
   * This is intended for internal use where we need to figure out which state
   * corresponds to aTrackID, not for availability checks. As such, we assert
   * that the device does indeed exist.
   *
   * Since this is a raw pointer and the state lifetime depends on the
   * SourceListener's lifetime, it's internal use only.
   */
  DeviceState& GetDeviceStateFor(TrackID aTrackID) const;

  // true after this listener has had all devices stopped. MainThread only.
  bool mStopped;

  // never ever indirect off this; just for assertions
  PRThread* mMainThreadCheck;

  // Set in Register() on main thread, then read from any thread.
  PrincipalHandle mPrincipalHandle;

  // Weak pointer to the window listener that owns us. MainThread only.
  GetUserMediaWindowListener* mWindowListener;

  // Accessed from MediaStreamGraph thread, MediaManager thread, and MainThread
  // No locking needed as they're set on Activate() and never assigned to again.
  UniquePtr<DeviceState> mAudioDeviceState;
  UniquePtr<DeviceState> mVideoDeviceState;
  RefPtr<SourceMediaStream> mStream;  // threadsafe refcnt
};

/**
 * This class represents a WindowID and handles all MediaStreamTrackListeners
 * (here subclassed as SourceListeners) used to feed GetUserMedia source
 * streams. It proxies feedback from them into messages for browser chrome.
 * The SourceListeners are used to Start() and Stop() the underlying
 * MediaEngineSource when MediaStreams are assigned and deassigned in content.
 */
class GetUserMediaWindowListener {
  friend MediaManager;

 public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GetUserMediaWindowListener)

  // Create in an inactive state
  GetUserMediaWindowListener(base::Thread* aThread, uint64_t aWindowID,
                             const PrincipalHandle& aPrincipalHandle)
      : mMediaThread(aThread),
        mWindowID(aWindowID),
        mPrincipalHandle(aPrincipalHandle),
        mChromeNotificationTaskPosted(false) {}

  /**
   * Registers an inactive gUM source listener for this WindowListener.
   */
  void Register(RefPtr<SourceListener> aListener) {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aListener);
    MOZ_ASSERT(!aListener->Activated());
    MOZ_ASSERT(!mInactiveListeners.Contains(aListener), "Already registered");
    MOZ_ASSERT(!mActiveListeners.Contains(aListener), "Already activated");

    aListener->Register(this);
    mInactiveListeners.AppendElement(std::move(aListener));
  }

  /**
   * Activates an already registered and inactive gUM source listener for this
   * WindowListener.
   */
  void Activate(RefPtr<SourceListener> aListener,
                RefPtr<SourceMediaStream> aStream,
                RefPtr<MediaDevice> aAudioDevice,
                RefPtr<MediaDevice> aVideoDevice) {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(aListener);
    MOZ_ASSERT(!aListener->Activated());
    MOZ_ASSERT(mInactiveListeners.Contains(aListener),
               "Must be registered to activate");
    MOZ_ASSERT(!mActiveListeners.Contains(aListener), "Already activated");

    mInactiveListeners.RemoveElement(aListener);
    aListener->Activate(std::move(aStream), std::move(aAudioDevice),
                        std::move(aVideoDevice));
    mActiveListeners.AppendElement(std::move(aListener));
  }

  /**
   * Removes all SourceListeners from this window listener.
   * Removes this window listener from the list of active windows, so callers
   * need to make sure to hold a strong reference.
   */
  void RemoveAll() {
    MOZ_ASSERT(NS_IsMainThread());

    for (auto& l : nsTArray<RefPtr<SourceListener>>(mInactiveListeners)) {
      Remove(l);
    }
    for (auto& l : nsTArray<RefPtr<SourceListener>>(mActiveListeners)) {
      Remove(l);
    }
    MOZ_ASSERT(mInactiveListeners.Length() == 0);
    MOZ_ASSERT(mActiveListeners.Length() == 0);

    MediaManager* mgr = MediaManager::GetIfExists();
    if (!mgr) {
      MOZ_ASSERT(false, "MediaManager should stay until everything is removed");
      return;
    }
    GetUserMediaWindowListener* windowListener =
        mgr->GetWindowListener(mWindowID);

    if (!windowListener) {
      nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
      auto* globalWindow = nsGlobalWindowInner::GetInnerWindowWithId(mWindowID);
      if (globalWindow) {
        auto req = MakeRefPtr<GetUserMediaRequest>(
            globalWindow, VoidString(), VoidString(),
            EventStateManager::IsHandlingUserInput());
        obs->NotifyObservers(req, "recording-device-stopped", nullptr);
      }
      return;
    }

    MOZ_ASSERT(windowListener == this,
               "There should only be one window listener per window ID");

    LOG("GUMWindowListener %p removing windowID %" PRIu64, this, mWindowID);
    mgr->RemoveWindowID(mWindowID);
  }

  /**
   * Removes a listener from our lists. Safe to call without holding a hard
   * reference. That said, you'll still want to iterate on a copy of said lists,
   * if you end up calling this method (or methods that may call this method) in
   * the loop, to avoid inadvertently skipping members.
   */
  bool Remove(RefPtr<SourceListener> aListener) {
    // We refcount aListener on entry since we're going to proxy-release it
    // below to prevent the refcount going to zero on callers who might be
    // inside the listener, but operating without a hard reference to self.
    MOZ_ASSERT(NS_IsMainThread());

    if (!mInactiveListeners.RemoveElement(aListener) &&
        !mActiveListeners.RemoveElement(aListener)) {
      return false;
    }
    MOZ_ASSERT(!mInactiveListeners.Contains(aListener),
               "A SourceListener should only be once in one of "
               "mInactiveListeners and mActiveListeners");
    MOZ_ASSERT(!mActiveListeners.Contains(aListener),
               "A SourceListener should only be once in one of "
               "mInactiveListeners and mActiveListeners");

    LOG("GUMWindowListener %p stopping SourceListener %p.", this,
        aListener.get());
    aListener->Stop();

    if (MediaDevice* removedDevice = aListener->GetVideoDevice()) {
      bool revokeVideoPermission = true;
      nsString removedRawId;
      nsString removedSourceType;
      removedDevice->GetRawId(removedRawId);
      removedDevice->GetMediaSource(removedSourceType);
      for (const auto& l : mActiveListeners) {
        if (MediaDevice* device = l->GetVideoDevice()) {
          nsString rawId;
          device->GetRawId(rawId);
          if (removedRawId.Equals(rawId)) {
            revokeVideoPermission = false;
            break;
          }
        }
      }

      if (revokeVideoPermission) {
        nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
        auto* window = nsGlobalWindowInner::GetInnerWindowWithId(mWindowID);
        auto req = MakeRefPtr<GetUserMediaRequest>(
            window, removedRawId, removedSourceType,
            EventStateManager::IsHandlingUserInput());
        obs->NotifyObservers(req, "recording-device-stopped", nullptr);
      }
    }

    if (MediaDevice* removedDevice = aListener->GetAudioDevice()) {
      bool revokeAudioPermission = true;
      nsString removedRawId;
      nsString removedSourceType;
      removedDevice->GetRawId(removedRawId);
      removedDevice->GetMediaSource(removedSourceType);
      for (const auto& l : mActiveListeners) {
        if (MediaDevice* device = l->GetAudioDevice()) {
          nsString rawId;
          device->GetRawId(rawId);
          if (removedRawId.Equals(rawId)) {
            revokeAudioPermission = false;
            break;
          }
        }
      }

      if (revokeAudioPermission) {
        nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
        auto* window = nsGlobalWindowInner::GetInnerWindowWithId(mWindowID);
        auto req = MakeRefPtr<GetUserMediaRequest>(
            window, removedRawId, removedSourceType,
            EventStateManager::IsHandlingUserInput());
        obs->NotifyObservers(req, "recording-device-stopped", nullptr);
      }
    }
    if (mInactiveListeners.Length() == 0 && mActiveListeners.Length() == 0) {
      LOG("GUMWindowListener %p Removed last SourceListener. Cleaning up.",
          this);
      RemoveAll();
    }
    nsCOMPtr<nsIEventTarget> mainTarget = do_GetMainThread();
    // To allow being invoked by callers not holding a strong reference to self,
    // hold the listener alive until the stack has unwound, by always
    // dispatching a runnable (aAlwaysProxy = true)
    NS_ProxyRelease(__func__, mainTarget, aListener.forget(), true);
    return true;
  }

  void StopSharing();

  void StopRawID(const nsString& removedDeviceID);

  /**
   * Called by one of our SourceListeners when one of its tracks has changed so
   * that chrome state is affected.
   * Schedules an event for the next stable state to update chrome.
   */
  void ChromeAffectingStateChanged();

  /**
   * Called in stable state to send a notification to update chrome.
   */
  void NotifyChrome();

  bool CapturingVideo() const {
    MOZ_ASSERT(NS_IsMainThread());
    for (auto& l : mActiveListeners) {
      if (l->CapturingVideo()) {
        return true;
      }
    }
    return false;
  }

  bool CapturingAudio() const {
    MOZ_ASSERT(NS_IsMainThread());
    for (auto& l : mActiveListeners) {
      if (l->CapturingAudio()) {
        return true;
      }
    }
    return false;
  }

  CaptureState CapturingSource(MediaSourceEnum aSource) const {
    MOZ_ASSERT(NS_IsMainThread());
    CaptureState result = CaptureState::Off;
    for (auto& l : mActiveListeners) {
      result = CombineCaptureState(result, l->CapturingSource(aSource));
    }
    return result;
  }

  uint64_t WindowID() const { return mWindowID; }

  PrincipalHandle GetPrincipalHandle() const { return mPrincipalHandle; }

 private:
  ~GetUserMediaWindowListener() {
    MOZ_ASSERT(mInactiveListeners.Length() == 0,
               "Inactive listeners should already be removed");
    MOZ_ASSERT(mActiveListeners.Length() == 0,
               "Active listeners should already be removed");
    Unused << mMediaThread;
    // It's OK to release mStream on any thread; they have thread-safe
    // refcounts.
  }

  // Set at construction
  base::Thread* mMediaThread;

  uint64_t mWindowID;
  const PrincipalHandle mPrincipalHandle;

  // true if we have scheduled a task to notify chrome in the next stable state.
  // The task will reset this to false. MainThread only.
  bool mChromeNotificationTaskPosted;

  nsTArray<RefPtr<SourceListener>> mInactiveListeners;
  nsTArray<RefPtr<SourceListener>> mActiveListeners;
};

/**
 * nsIMediaDevice implementation.
 */
NS_IMPL_ISUPPORTS(MediaDevice, nsIMediaDevice)

MediaDevice::MediaDevice(const RefPtr<MediaEngineSource>& aSource,
                         const nsString& aName, const nsString& aID,
                         const nsString& aGroupID, const nsString& aRawID)
    : mSource(aSource),
      mSinkInfo(nullptr),
      mKind((mSource && MediaEngineSource::IsVideo(mSource->GetMediaSource()))
                ? MediaDeviceKind::Videoinput
                : MediaDeviceKind::Audioinput),
      mScary(mSource->GetScary()),
      mType(NS_ConvertUTF8toUTF16(
          dom::MediaDeviceKindValues::strings[uint32_t(mKind)].value)),
      mName(aName),
      mID(aID),
      mGroupID(aGroupID),
      mRawID(aRawID) {
  MOZ_ASSERT(mSource);
}

MediaDevice::MediaDevice(const RefPtr<AudioDeviceInfo>& aAudioDeviceInfo,
                         const nsString& aID, const nsString& aGroupID,
                         const nsString& aRawID)
    : mSource(nullptr),
      mSinkInfo(aAudioDeviceInfo),
      mKind(mSinkInfo->Type() == AudioDeviceInfo::TYPE_INPUT
                ? MediaDeviceKind::Audioinput
                : MediaDeviceKind::Audiooutput),
      mScary(false),
      mType(NS_ConvertUTF8toUTF16(
          dom::MediaDeviceKindValues::strings[uint32_t(mKind)].value)),
      mName(mSinkInfo->Name()),
      mID(aID),
      mGroupID(aGroupID),
      mRawID(aRawID) {
  // For now this ctor is used only for Audiooutput.
  // It could be used for Audioinput and Videoinput
  // when we do not instantiate a MediaEngineSource
  // during EnumerateDevices.
  MOZ_ASSERT(mKind == MediaDeviceKind::Audiooutput);
  MOZ_ASSERT(mSinkInfo);
}

MediaDevice::MediaDevice(const RefPtr<MediaDevice>& aOther, const nsString& aID,
                         const nsString& aGroupID, const nsString& aRawID)
    : mSource(aOther->mSource),
      mSinkInfo(aOther->mSinkInfo),
      mKind(aOther->mKind),
      mScary(aOther->mScary),
      mType(aOther->mType),
      mName(aOther->mName),
      mID(aID),
      mGroupID(aGroupID),
      mRawID(aRawID) {
  MOZ_ASSERT(aOther);
}

/**
 * Helper functions that implement the constraints algorithm from
 * http://dev.w3.org/2011/webrtc/editor/getusermedia.html#methods-5
 */

/* static */
bool MediaDevice::StringsContain(const OwningStringOrStringSequence& aStrings,
                                 nsString aN) {
  return aStrings.IsString() ? aStrings.GetAsString() == aN
                             : aStrings.GetAsStringSequence().Contains(aN);
}

/* static */
uint32_t MediaDevice::FitnessDistance(
    nsString aN, const ConstrainDOMStringParameters& aParams) {
  if (aParams.mExact.WasPassed() &&
      !StringsContain(aParams.mExact.Value(), aN)) {
    return UINT32_MAX;
  }
  if (aParams.mIdeal.WasPassed() &&
      !StringsContain(aParams.mIdeal.Value(), aN)) {
    return 1;
  }
  return 0;
}

// Binding code doesn't templatize well...

/* static */
uint32_t MediaDevice::FitnessDistance(
    nsString aN,
    const OwningStringOrStringSequenceOrConstrainDOMStringParameters&
        aConstraint) {
  if (aConstraint.IsString()) {
    ConstrainDOMStringParameters params;
    params.mIdeal.Construct();
    params.mIdeal.Value().SetAsString() = aConstraint.GetAsString();
    return FitnessDistance(aN, params);
  } else if (aConstraint.IsStringSequence()) {
    ConstrainDOMStringParameters params;
    params.mIdeal.Construct();
    params.mIdeal.Value().SetAsStringSequence() =
        aConstraint.GetAsStringSequence();
    return FitnessDistance(aN, params);
  } else {
    return FitnessDistance(aN, aConstraint.GetAsConstrainDOMStringParameters());
  }
}

uint32_t MediaDevice::GetBestFitnessDistance(
    const nsTArray<const NormalizedConstraintSet*>& aConstraintSets,
    bool aIsChrome) {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);

  // Forward request to underlying object to interrogate per-mode capabilities.
  // Pass in device's origin-specific id for deviceId constraint comparison.
  const nsString& id = aIsChrome ? mRawID : mID;
  return mSource->GetBestFitnessDistance(aConstraintSets, id);
}

NS_IMETHODIMP
MediaDevice::GetName(nsAString& aName) {
  MOZ_ASSERT(NS_IsMainThread());
  aName.Assign(mName);
  return NS_OK;
}

NS_IMETHODIMP
MediaDevice::GetType(nsAString& aType) {
  MOZ_ASSERT(NS_IsMainThread());
  aType.Assign(mType);
  return NS_OK;
}

NS_IMETHODIMP
MediaDevice::GetId(nsAString& aID) {
  MOZ_ASSERT(NS_IsMainThread());
  aID.Assign(mID);
  return NS_OK;
}

NS_IMETHODIMP
MediaDevice::GetRawId(nsAString& aID) {
  MOZ_ASSERT(NS_IsMainThread());
  aID.Assign(mRawID);
  return NS_OK;
}

NS_IMETHODIMP
MediaDevice::GetGroupId(nsAString& aGroupID) {
  MOZ_ASSERT(NS_IsMainThread());
  aGroupID.Assign(mGroupID);
  return NS_OK;
}

NS_IMETHODIMP
MediaDevice::GetScary(bool* aScary) {
  *aScary = mScary;
  return NS_OK;
}

void MediaDevice::GetSettings(MediaTrackSettings& aOutSettings) const {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mSource);
  mSource->GetSettings(aOutSettings);
}

// Threadsafe since mSource is const.
NS_IMETHODIMP
MediaDevice::GetMediaSource(nsAString& aMediaSource) {
  aMediaSource.Assign(NS_ConvertUTF8toUTF16(
      dom::MediaSourceEnumValues::strings[uint32_t(GetMediaSource())].value));
  return NS_OK;
}

nsresult MediaDevice::Allocate(const MediaTrackConstraints& aConstraints,
                               const MediaEnginePrefs& aPrefs,
                               const ipc::PrincipalInfo& aPrincipalInfo,
                               const char** aOutBadConstraint) {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  return mSource->Allocate(aConstraints, aPrefs, mID, aPrincipalInfo,
                           aOutBadConstraint);
}

void MediaDevice::SetTrack(const RefPtr<SourceMediaStream>& aStream,
                           TrackID aTrackID,
                           const PrincipalHandle& aPrincipalHandle) {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  mSource->SetTrack(aStream, aTrackID, aPrincipalHandle);
}

nsresult MediaDevice::Start() {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  return mSource->Start();
}

nsresult MediaDevice::Reconfigure(const MediaTrackConstraints& aConstraints,
                                  const MediaEnginePrefs& aPrefs,
                                  const char** aOutBadConstraint) {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  return mSource->Reconfigure(aConstraints, aPrefs, mID, aOutBadConstraint);
}

nsresult MediaDevice::FocusOnSelectedSource() {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  return mSource->FocusOnSelectedSource();
}

nsresult MediaDevice::Stop() {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  return mSource->Stop();
}

nsresult MediaDevice::Deallocate() {
  MOZ_ASSERT(MediaManager::IsInMediaThread());
  MOZ_ASSERT(mSource);
  return mSource->Deallocate();
}

MediaSourceEnum MediaDevice::GetMediaSource() const {
  // Threadsafe because mSource is const. GetMediaSource() might have other
  // requirements.
  MOZ_ASSERT(mSource);
  return mSource->GetMediaSource();
}

static bool IsOn(const OwningBooleanOrMediaTrackConstraints& aUnion) {
  return !aUnion.IsBoolean() || aUnion.GetAsBoolean();
}

static const MediaTrackConstraints& GetInvariant(
    const OwningBooleanOrMediaTrackConstraints& aUnion) {
  static const MediaTrackConstraints empty;
  return aUnion.IsMediaTrackConstraints() ? aUnion.GetAsMediaTrackConstraints()
                                          : empty;
}

/**
 * Creates a MediaStream, attaches a listener and fires off a success callback
 * to the DOM with the stream. We also pass in the error callback so it can
 * be released correctly.
 *
 * All of this must be done on the main thread!
 *
 * Note that the various GetUserMedia Runnable classes currently allow for
 * two streams.  If we ever need to support getting more than two streams
 * at once, we could convert everything to nsTArray<RefPtr<blah> >'s,
 * though that would complicate the constructors some.  Currently the
 * GetUserMedia spec does not allow for more than 2 streams to be obtained in
 * one call, to simplify handling of constraints.
 */
class GetUserMediaStreamRunnable : public Runnable {
 public:
  GetUserMediaStreamRunnable(
      MozPromiseHolder<MediaManager::StreamPromise>&& aHolder,
      uint64_t aWindowID, RefPtr<GetUserMediaWindowListener> aWindowListener,
      RefPtr<SourceListener> aSourceListener,
      const ipc::PrincipalInfo& aPrincipalInfo,
      const MediaStreamConstraints& aConstraints,
      RefPtr<MediaDevice> aAudioDevice, RefPtr<MediaDevice> aVideoDevice,
      RefPtr<PeerIdentity> aPeerIdentity, bool aIsChrome)
      : Runnable("GetUserMediaStreamRunnable"),
        mHolder(std::move(aHolder)),
        mConstraints(aConstraints),
        mAudioDevice(std::move(aAudioDevice)),
        mVideoDevice(std::move(aVideoDevice)),
        mWindowID(aWindowID),
        mWindowListener(std::move(aWindowListener)),
        mSourceListener(std::move(aSourceListener)),
        mPrincipalInfo(aPrincipalInfo),
        mPeerIdentity(std::move(aPeerIdentity)),
        mManager(MediaManager::GetInstance()) {}

  ~GetUserMediaStreamRunnable() {
    mHolder.RejectIfExists(
        MakeRefPtr<MediaMgrError>(MediaMgrError::Name::AbortError), __func__);
  }

  class TracksCreatedListener : public MediaStreamTrackListener {
   public:
    TracksCreatedListener(
        RefPtr<MediaManager> aManager,
        MozPromiseHolder<MediaManager::StreamPromise>&& aHolder,
        RefPtr<GetUserMediaWindowListener> aWindowListener, uint64_t aWindowID,
        RefPtr<DOMMediaStream> aStream, RefPtr<MediaStreamTrack> aTrack,
        RefPtr<GenericNonExclusivePromise>&& aFirstFramePromise)
        : mWindowListener(std::move(aWindowListener)),
          mHolder(std::move(aHolder)),
          mManager(std::move(aManager)),
          mWindowID(aWindowID),
          mGraph(aTrack->GraphImpl()),
          mStream(new nsMainThreadPtrHolder<DOMMediaStream>(
              "TracksCreatedListener::mStream", aStream.forget())),
          mTrack(new nsMainThreadPtrHolder<MediaStreamTrack>(
              "TracksCreatedListener::mTrack", aTrack.forget())),
          mFirstFramePromise(aFirstFramePromise) {}

    ~TracksCreatedListener() {
      RejectIfExists(MakeRefPtr<MediaMgrError>(MediaMgrError::Name::AbortError),
                     __func__);
    }

    // TODO: The need for this should be removed by an upcoming refactor.
    void RejectIfExists(RefPtr<MediaMgrError>&& aError,
                        const char* aMethodName) {
      mHolder.RejectIfExists(std::move(aError), aMethodName);
    }

    void NotifyOutput(MediaStreamGraph* aGraph,
                      StreamTime aCurrentTrackTime) override {
      // It's enough to know that one of the tracks have output, as both tracks
      // are guaranteed to be created in the graph at this point.

      if (mDispatchedTracksCreated) {
        return;
      }
      mDispatchedTracksCreated = true;
      nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
          "TracksCreatedListener::NotifyOutput Notifier",
          [self = RefPtr<TracksCreatedListener>(this), this]() {
            mTrack->RemoveListener(this);

            if (!mManager->IsWindowListenerStillActive(mWindowListener)) {
              return;
            }

            // This is safe since we're on main-thread, and the windowlist can
            // only be invalidated from the main-thread (see OnNavigation)
            if (!mFirstFramePromise) {
              LOG("Returning success for getUserMedia()");
              mHolder.Resolve(RefPtr<DOMMediaStream>(mStream), __func__);
              return;
            }
            LOG("Deferring getUserMedia success to arrival of 1st frame");
            mFirstFramePromise->Then(
                GetMainThreadSerialEventTarget(), __func__,
                [holder = std::move(mHolder), stream = mStream](
                    const GenericNonExclusivePromise::ResolveOrRejectValue&
                        aValue) mutable {
                  if (aValue.IsReject()) {
                    holder.Reject(MakeRefPtr<MediaMgrError>(
                                      MediaMgrError::Name::AbortError),
                                  __func__);
                  } else {
                    LOG("Returning success for getUserMedia()!");
                    holder.Resolve(RefPtr<DOMMediaStream>(stream), __func__);
                  }
                });
          });
      // DispatchToMainThreadStableState will make the runnable run
      // in stable state. But since the runnable runs JS we need to make a
      // double dispatch.
      mGraph->DispatchToMainThreadStableState(NS_NewRunnableFunction(
          "TracksCreatedListener::NotifyOutput Stable State Notifier",
          [graph = mGraph, r = std::move(r)]() mutable {
            graph->Dispatch(r.forget());
          }));
    }
    void NotifyRemoved() override {
      mGraph->Dispatch(NS_NewRunnableFunction(
          "TracksCreatedListener::NotifyRemoved CycleBreaker",
          [self = RefPtr<TracksCreatedListener>(this)]() {
            self->mTrack->RemoveListener(self);
          }));
    }
    const RefPtr<GetUserMediaWindowListener> mWindowListener;
    MozPromiseHolder<MediaManager::StreamPromise> mHolder;
    const RefPtr<MediaManager> mManager;
    uint64_t mWindowID;
    const RefPtr<MediaStreamGraphImpl> mGraph;
    // Keep the DOMMediaStream alive until the success callback has been called,
    // otherwise we might immediately destroy the DOMMediaStream and
    // shut down the underlying MediaStream prematurely.
    // This creates a cycle which is broken when we're destroyed, i.e., either
    // when we've called the success callback and thus removed the listener from
    // the graph, or on graph shutdown.
    nsMainThreadPtrHandle<DOMMediaStream> mStream;
    nsMainThreadPtrHandle<MediaStreamTrack> mTrack;
    RefPtr<GenericNonExclusivePromise> mFirstFramePromise;
    // Graph thread only.
    bool mDispatchedTracksCreated = false;
  };

  NS_IMETHOD
  Run() override {
    MOZ_ASSERT(NS_IsMainThread());
    LOG("GetUserMediaStreamRunnable::Run()");
    nsGlobalWindowInner* window =
        nsGlobalWindowInner::GetInnerWindowWithId(mWindowID);

    // We're on main-thread, and the windowlist can only
    // be invalidated from the main-thread (see OnNavigation)
    if (!mManager->IsWindowListenerStillActive(mWindowListener)) {
      // This window is no longer live. mListener has already been removed.
      return NS_OK;
    }

    MediaStreamGraph::GraphDriverType graphDriverType =
        mAudioDevice ? MediaStreamGraph::AUDIO_THREAD_DRIVER
                     : MediaStreamGraph::SYSTEM_THREAD_DRIVER;
    MediaStreamGraph* msg = MediaStreamGraph::GetInstance(
        graphDriverType, window, MediaStreamGraph::REQUEST_DEFAULT_SAMPLE_RATE);

    RefPtr<DOMMediaStream> domStream;
    RefPtr<SourceMediaStream> stream;
    RefPtr<GenericNonExclusivePromise> firstFramePromise;
    // AudioCapture is a special case, here, in the sense that we're not really
    // using the audio source and the SourceMediaStream, which acts as
    // placeholders. We re-route a number of stream internaly in the MSG and mix
    // them down instead.
    if (mAudioDevice &&
        mAudioDevice->GetMediaSource() == MediaSourceEnum::AudioCapture) {
      NS_WARNING(
          "MediaCaptureWindowState doesn't handle "
          "MediaSourceEnum::AudioCapture. This must be fixed with UX "
          "before shipping.");
      // It should be possible to pipe the capture stream to anything. CORS is
      // not a problem here, we got explicit user content.
      nsCOMPtr<nsIPrincipal> principal =
          window->GetExtantDoc()->NodePrincipal();
      domStream = DOMMediaStream::CreateAudioCaptureStreamAsInput(
          window, principal, msg);

      stream = msg->CreateSourceStream();  // Placeholder
      msg->RegisterCaptureStreamForWindow(
          mWindowID, domStream->GetInputStream()->AsProcessedStream());
      window->SetAudioCapture(true);
    } else {
      class LocalTrackSource : public MediaStreamTrackSource {
       public:
        LocalTrackSource(nsIPrincipal* aPrincipal, const nsString& aLabel,
                         const RefPtr<SourceListener>& aListener,
                         MediaSourceEnum aSource, TrackID aTrackID,
                         RefPtr<PeerIdentity> aPeerIdentity)
            : MediaStreamTrackSource(aPrincipal, aLabel),
              mListener(aListener.get()),
              mSource(aSource),
              mTrackID(aTrackID),
              mPeerIdentity(std::move(aPeerIdentity)) {}

        MediaSourceEnum GetMediaSource() const override { return mSource; }

        const PeerIdentity* GetPeerIdentity() const override {
          return mPeerIdentity;
        }

        RefPtr<MediaStreamTrackSource::ApplyConstraintsPromise>
        ApplyConstraints(const MediaTrackConstraints& aConstraints,
                         CallerType aCallerType) override {
          MOZ_ASSERT(NS_IsMainThread());
          if (sHasShutdown || !mListener) {
            // Track has been stopped, or we are in shutdown. In either case
            // there's no observable outcome, so pretend we succeeded.
            return MediaStreamTrackSource::ApplyConstraintsPromise::
                CreateAndResolve(false, __func__);
          }
          return mListener->ApplyConstraintsToTrack(mTrackID, aConstraints,
                                                    aCallerType);
        }

        void GetSettings(MediaTrackSettings& aOutSettings) override {
          if (mListener) {
            mListener->GetSettingsFor(mTrackID, aOutSettings);
          }
        }

        void Stop() override {
          if (mListener) {
            mListener->StopTrack(mTrackID);
            mListener = nullptr;
          }
        }

        void Disable() override {
          if (mListener) {
            mListener->SetEnabledFor(mTrackID, false);
          }
        }

        void Enable() override {
          if (mListener) {
            mListener->SetEnabledFor(mTrackID, true);
          }
        }

       protected:
        ~LocalTrackSource() {}

        // This is a weak pointer to avoid having the SourceListener (which may
        // have references to threads and threadpools) kept alive by DOM-objects
        // that may have ref-cycles and thus are released very late during
        // shutdown, even after xpcom-shutdown-threads. See bug 1351655 for what
        // can happen.
        WeakPtr<SourceListener> mListener;
        const MediaSourceEnum mSource;
        const TrackID mTrackID;
        const RefPtr<const PeerIdentity> mPeerIdentity;
      };

      nsCOMPtr<nsIPrincipal> principal;
      if (mPeerIdentity) {
        principal = NullPrincipal::CreateWithInheritedAttributes(
            window->GetExtantDoc()->NodePrincipal());
      } else {
        principal = window->GetExtantDoc()->NodePrincipal();
      }

      // Normal case, connect the source stream to the track union stream to
      // avoid us blocking. Pass a simple TrackSourceGetter for potential
      // fake tracks. Apart from them gUM never adds tracks dynamically.
      domStream = DOMMediaStream::CreateSourceStreamAsInput(window, msg);
      stream = domStream->GetInputStream()->AsSourceStream();

      if (mAudioDevice) {
        nsString audioDeviceName;
        mAudioDevice->GetName(audioDeviceName);
        const MediaSourceEnum source = mAudioDevice->GetMediaSource();
        RefPtr<MediaStreamTrackSource> audioSource =
            new LocalTrackSource(principal, audioDeviceName, mSourceListener,
                                 source, kAudioTrack, mPeerIdentity);
        MOZ_ASSERT(IsOn(mConstraints.mAudio));
        RefPtr<MediaStreamTrack> track = domStream->CreateDOMTrack(
            kAudioTrack, MediaSegment::AUDIO, audioSource,
            GetInvariant(mConstraints.mAudio));
        domStream->AddTrackInternal(track);
      }
      if (mVideoDevice) {
        nsString videoDeviceName;
        mVideoDevice->GetName(videoDeviceName);
        const MediaSourceEnum source = mVideoDevice->GetMediaSource();
        RefPtr<MediaStreamTrackSource> videoSource =
            new LocalTrackSource(principal, videoDeviceName, mSourceListener,
                                 source, kVideoTrack, mPeerIdentity);
        MOZ_ASSERT(IsOn(mConstraints.mVideo));
        RefPtr<MediaStreamTrack> track = domStream->CreateDOMTrack(
            kVideoTrack, MediaSegment::VIDEO, videoSource,
            GetInvariant(mConstraints.mVideo));
        domStream->AddTrackInternal(track);
        switch (source) {
          case MediaSourceEnum::Browser:
          case MediaSourceEnum::Screen:
          case MediaSourceEnum::Window:
            // Wait for first frame for screen-sharing devices, to ensure
            // with and height settings are available immediately, to pass wpt.
            firstFramePromise = mVideoDevice->mSource->GetFirstFramePromise();
            break;
          default:
            break;
        }
      }
    }

    if (!domStream || !stream || sHasShutdown) {
      LOG("Returning error for getUserMedia() - no stream");

      mHolder.Reject(MakeRefPtr<MediaMgrError>(
                         MediaMgrError::Name::AbortError,
                         sHasShutdown ? NS_LITERAL_STRING("In shutdown")
                                      : NS_LITERAL_STRING("No stream.")),
                     __func__);
      return NS_OK;
    }

    // Activate our source listener. We'll call Start() on the source when we
    // get a callback that the MediaStream has started consuming. The listener
    // is freed when the page is invalidated (on navigation or close).
    mWindowListener->Activate(mSourceListener, stream, mAudioDevice,
                              mVideoDevice);

    nsTArray<RefPtr<MediaStreamTrack>> tracks(2);
    domStream->GetTracks(tracks);
    RefPtr<MediaStreamTrack> track = tracks[0];
    auto tracksCreatedListener = MakeRefPtr<TracksCreatedListener>(
        mManager, std::move(mHolder), mWindowListener, mWindowID, domStream,
        track, std::move(firstFramePromise));

    // Dispatch to the media thread to ask it to start the sources,
    // because that can take a while.
    // Pass ownership of domStream through the lambda to the nested chrome
    // notification lambda to ensure it's kept alive until that lambda runs or
    // is discarded.
    mSourceListener->InitializeAsync()->Then(
        GetMainThreadSerialEventTarget(), __func__,
        [manager = mManager, windowListener = mWindowListener, track,
         tracksCreatedListener]() {
          LOG("GetUserMediaStreamRunnable::Run: starting success callback "
              "following InitializeAsync()");
          // Initiating and starting devices succeeded.
          track->AddListener(tracksCreatedListener);
          windowListener->ChromeAffectingStateChanged();
          manager->SendPendingGUMRequest();
        },
        [manager = mManager, windowID = mWindowID,
         tracksCreatedListener](RefPtr<MediaMgrError>&& aError) {
          MOZ_ASSERT(NS_IsMainThread());
          LOG("GetUserMediaStreamRunnable::Run: starting failure callback "
              "following InitializeAsync()");
          // Initiating and starting devices failed.

          // Only run if the window is still active for our window listener.
          if (!(manager->IsWindowStillActive(windowID))) {
            return;
          }
          // This is safe since we're on main-thread, and the windowlist can
          // only be invalidated from the main-thread (see OnNavigation)
          tracksCreatedListener->RejectIfExists(std::move(aError), __func__);
        });

    if (!IsPincipalInfoPrivate(mPrincipalInfo)) {
      // Call GetPrincipalKey again, this time w/persist = true, to promote
      // deviceIds to persistent, in case they're not already. Fire'n'forget.
      media::GetPrincipalKey(mPrincipalInfo, true)
          ->Then(GetCurrentThreadSerialEventTarget(), __func__,
                 [](const PrincipalKeyPromise::ResolveOrRejectValue& aValue) {
                   if (aValue.IsReject()) {
                     LOG("Failed get Principal key. Persisting of deviceIds "
                         "will be broken");
                   }
                 });
    }
    return NS_OK;
  }

 private:
  MozPromiseHolder<MediaManager::StreamPromise> mHolder;
  MediaStreamConstraints mConstraints;
  RefPtr<MediaDevice> mAudioDevice;
  RefPtr<MediaDevice> mVideoDevice;
  uint64_t mWindowID;
  RefPtr<GetUserMediaWindowListener> mWindowListener;
  RefPtr<SourceListener> mSourceListener;
  ipc::PrincipalInfo mPrincipalInfo;
  RefPtr<PeerIdentity> mPeerIdentity;
  RefPtr<MediaManager> mManager;  // get ref to this when creating the runnable
};

// Source getter returning full list

static void GetMediaDevices(MediaEngine* aEngine, uint64_t aWindowId,
                            MediaSourceEnum aSrcType,
                            MediaManager::MediaDeviceSet& aResult,
                            const char* aMediaDeviceName = nullptr) {
  MOZ_ASSERT(MediaManager::IsInMediaThread());

  LOG("%s: aEngine=%p, aWindowId=%" PRIu64 ", aSrcType=%" PRIu8
      ", aMediaDeviceName=%s",
      __func__, aEngine, aWindowId, static_cast<uint8_t>(aSrcType),
      aMediaDeviceName ? aMediaDeviceName : "null");
  nsTArray<RefPtr<MediaDevice>> devices;
  aEngine->EnumerateDevices(aWindowId, aSrcType, MediaSinkEnum::Other,
                            &devices);

  /*
   * We're allowing multiple tabs to access the same camera for parity
   * with Chrome.  See bug 811757 for some of the issues surrounding
   * this decision.  To disallow, we'd filter by IsAvailable() as we used
   * to.
   */
  if (aMediaDeviceName && *aMediaDeviceName) {
    for (auto& device : devices) {
      if (device->mName.EqualsASCII(aMediaDeviceName)) {
        aResult.AppendElement(device);
        LOG("%s: found aMediaDeviceName=%s", __func__, aMediaDeviceName);
        break;
      }
    }
  } else {
    aResult = devices;
    if (MOZ_LOG_TEST(gMediaManagerLog, mozilla::LogLevel::Debug)) {
      for (auto& device : devices) {
        LOG("%s: appending device=%s", __func__,
            NS_ConvertUTF16toUTF8(device->mName).get());
      }
    }
  }
}

RefPtr<MediaManager::BadConstraintsPromise> MediaManager::SelectSettings(
    const MediaStreamConstraints& aConstraints, bool aIsChrome,
    const RefPtr<MediaDeviceSetRefCnt>& aSources) {
  MOZ_ASSERT(NS_IsMainThread());

  // Algorithm accesses device capabilities code and must run on media thread.
  // Modifies passed-in aSources.

  return MediaManager::PostTask<BadConstraintsPromise>(
      __func__, [aConstraints, aSources, aIsChrome](
                    MozPromiseHolder<BadConstraintsPromise>& holder) mutable {
        auto& sources = *aSources;

        // Since the advanced part of the constraints algorithm needs to know
        // when a candidate set is overconstrained (zero members), we must split
        // up the list into videos and audios, and put it back together again at
        // the end.

        nsTArray<RefPtr<MediaDevice>> videos;
        nsTArray<RefPtr<MediaDevice>> audios;

        for (auto& source : sources) {
          MOZ_ASSERT(source->mKind == MediaDeviceKind::Videoinput ||
                     source->mKind == MediaDeviceKind::Audioinput);
          if (source->mKind == MediaDeviceKind::Videoinput) {
            videos.AppendElement(source);
          } else if (source->mKind == MediaDeviceKind::Audioinput) {
            audios.AppendElement(source);
          }
        }
        sources.Clear();
        const char* badConstraint = nullptr;
        bool needVideo = IsOn(aConstraints.mVideo);
        bool needAudio = IsOn(aConstraints.mAudio);

        if (needVideo && videos.Length()) {
          badConstraint = MediaConstraintsHelper::SelectSettings(
              NormalizedConstraints(GetInvariant(aConstraints.mVideo)), videos,
              aIsChrome);
        }
        if (!badConstraint && needAudio && audios.Length()) {
          badConstraint = MediaConstraintsHelper::SelectSettings(
              NormalizedConstraints(GetInvariant(aConstraints.mAudio)), audios,
              aIsChrome);
        }
        if (!badConstraint && !needVideo == !videos.Length() &&
            !needAudio == !audios.Length()) {
          for (auto& video : videos) {
            sources.AppendElement(video);
          }
          for (auto& audio : audios) {
            sources.AppendElement(audio);
          }
        }
        holder.Resolve(badConstraint, __func__);
      });
}

/**
 * Runs on a seperate thread and is responsible for enumerating devices.
 * Depending on whether a picture or stream was asked for, either
 * ProcessGetUserMedia is called, and the results are sent back to the DOM.
 *
 * Do not run this on the main thread. The success and error callbacks *MUST*
 * be dispatched on the main thread!
 */
class GetUserMediaTask : public Runnable {
 public:
  GetUserMediaTask(const MediaStreamConstraints& aConstraints,
                   MozPromiseHolder<MediaManager::StreamPromise>&& aHolder,
                   uint64_t aWindowID,
                   RefPtr<GetUserMediaWindowListener> aWindowListener,
                   RefPtr<SourceListener> aSourceListener,
                   const MediaEnginePrefs& aPrefs,
                   const ipc::PrincipalInfo& aPrincipalInfo, bool aIsChrome,
                   RefPtr<MediaManager::MediaDeviceSetRefCnt>&& aMediaDeviceSet,
                   bool aShouldFocusSource)
      : Runnable("GetUserMediaTask"),
        mConstraints(aConstraints),
        mHolder(std::move(aHolder)),
        mWindowID(aWindowID),
        mWindowListener(std::move(aWindowListener)),
        mSourceListener(std::move(aSourceListener)),
        mPrefs(aPrefs),
        mPrincipalInfo(aPrincipalInfo),
        mIsChrome(aIsChrome),
        mShouldFocusSource(aShouldFocusSource),
        mDeviceChosen(false),
        mMediaDeviceSet(aMediaDeviceSet),
        mManager(MediaManager::GetInstance()) {}

  ~GetUserMediaTask() {
    if (!mHolder.IsEmpty()) {
      Fail(MediaMgrError::Name::NotAllowedError);
    }
  }

  void Fail(MediaMgrError::Name aName, const nsString& aMessage = EmptyString(),
            const nsString& aConstraint = EmptyString()) {
    NS_DispatchToMainThread(NS_NewRunnableFunction(
        "GetUserMediaTask::Fail",
        [aName, aMessage, aConstraint, holder = std::move(mHolder)]() mutable {
          holder.Reject(MakeRefPtr<MediaMgrError>(aName, aMessage, aConstraint),
                        __func__);
        }));
    // Do after the above runs, as it checks active window list
    NS_DispatchToMainThread(NewRunnableMethod<RefPtr<SourceListener>>(
        "GetUserMediaWindowListener::Remove", mWindowListener,
        &GetUserMediaWindowListener::Remove, mSourceListener));
  }

  NS_IMETHOD
  Run() override {
    MOZ_ASSERT(!NS_IsMainThread());
    MOZ_ASSERT(mDeviceChosen);
    LOG("GetUserMediaTask::Run()");

    // Allocate a video or audio device and return a MediaStream via
    // a GetUserMediaStreamRunnable.

    nsresult rv;
    const char* errorMsg = nullptr;
    const char* badConstraint = nullptr;

    if (mAudioDevice) {
      auto& constraints = GetInvariant(mConstraints.mAudio);
      rv = mAudioDevice->Allocate(constraints, mPrefs, mPrincipalInfo,
                                  &badConstraint);
      if (NS_FAILED(rv)) {
        errorMsg = "Failed to allocate audiosource";
        if (rv == NS_ERROR_NOT_AVAILABLE && !badConstraint) {
          nsTArray<RefPtr<MediaDevice>> devices;
          devices.AppendElement(mAudioDevice);
          badConstraint = MediaConstraintsHelper::SelectSettings(
              NormalizedConstraints(constraints), devices, mIsChrome);
        }
      }
    }
    if (!errorMsg && mVideoDevice) {
      auto& constraints = GetInvariant(mConstraints.mVideo);
      rv = mVideoDevice->Allocate(constraints, mPrefs, mPrincipalInfo,
                                  &badConstraint);
      if (NS_FAILED(rv)) {
        errorMsg = "Failed to allocate videosource";
        if (rv == NS_ERROR_NOT_AVAILABLE && !badConstraint) {
          nsTArray<RefPtr<MediaDevice>> devices;
          devices.AppendElement(mVideoDevice);
          badConstraint = MediaConstraintsHelper::SelectSettings(
              NormalizedConstraints(constraints), devices, mIsChrome);
        }
        if (mAudioDevice) {
          mAudioDevice->Deallocate();
        }
      } else {
        if (!mIsChrome) {
          if (mShouldFocusSource) {
            rv = mVideoDevice->FocusOnSelectedSource();

            if (NS_FAILED(rv)) {
              LOG("FocusOnSelectedSource failed");
            }
          }
        }
      }
    }
    if (errorMsg) {
      LOG("%s %" PRIu32, errorMsg, static_cast<uint32_t>(rv));
      if (badConstraint) {
        Fail(MediaMgrError::Name::OverconstrainedError, NS_LITERAL_STRING(""),
             NS_ConvertUTF8toUTF16(badConstraint));
      } else {
        Fail(MediaMgrError::Name::NotReadableError,
             NS_ConvertUTF8toUTF16(errorMsg));
      }
      NS_DispatchToMainThread(
          NS_NewRunnableFunction("MediaManager::SendPendingGUMRequest", []() {
            MediaManager* manager = MediaManager::GetIfExists();
            if (!manager) {
              return;
            }
            manager->SendPendingGUMRequest();
          }));
      return NS_OK;
    }
    PeerIdentity* peerIdentity = nullptr;
    if (!mConstraints.mPeerIdentity.IsEmpty()) {
      peerIdentity = new PeerIdentity(mConstraints.mPeerIdentity);
    }

    NS_DispatchToMainThread(do_AddRef(new GetUserMediaStreamRunnable(
        std::move(mHolder), mWindowID, mWindowListener, mSourceListener,
        mPrincipalInfo, mConstraints, mAudioDevice, mVideoDevice, peerIdentity,
        mIsChrome)));
    return NS_OK;
  }

  nsresult Denied(MediaMgrError::Name aName,
                  const nsString& aMessage = EmptyString()) {
    // We add a disabled listener to the StreamListeners array until accepted
    // If this was the only active MediaStream, remove the window from the list.
    if (NS_IsMainThread()) {
      mHolder.Reject(MakeRefPtr<MediaMgrError>(aName, aMessage), __func__);
      // Should happen *after* error runs for consistency, but may not matter
      mWindowListener->Remove(mSourceListener);
    } else {
      // This will re-check the window being alive on main-thread
      Fail(aName, aMessage);
    }
    return NS_OK;
  }

  nsresult SetContraints(const MediaStreamConstraints& aConstraints) {
    mConstraints = aConstraints;
    return NS_OK;
  }

  const MediaStreamConstraints& GetConstraints() { return mConstraints; }

  nsresult SetAudioDevice(RefPtr<MediaDevice> aAudioDevice) {
    mAudioDevice = std::move(aAudioDevice);
    mDeviceChosen = true;
    return NS_OK;
  }

  nsresult SetVideoDevice(RefPtr<MediaDevice> aVideoDevice) {
    mVideoDevice = std::move(aVideoDevice);
    mDeviceChosen = true;
    return NS_OK;
  }

  uint64_t GetWindowID() { return mWindowID; }

 private:
  MediaStreamConstraints mConstraints;

  MozPromiseHolder<MediaManager::StreamPromise> mHolder;
  uint64_t mWindowID;
  RefPtr<GetUserMediaWindowListener> mWindowListener;
  RefPtr<SourceListener> mSourceListener;
  RefPtr<MediaDevice> mAudioDevice;
  RefPtr<MediaDevice> mVideoDevice;
  const MediaEnginePrefs mPrefs;
  ipc::PrincipalInfo mPrincipalInfo;
  bool mIsChrome;
  bool mShouldFocusSource;

  bool mDeviceChosen;

 public:
  RefPtr<MediaManager::MediaDeviceSetRefCnt> mMediaDeviceSet;

 private:
  RefPtr<MediaManager> mManager;  // get ref to this when creating the runnable
};

#if defined(ANDROID)
class GetUserMediaRunnableWrapper : public Runnable {
 public:
  // This object must take ownership of task
  explicit GetUserMediaRunnableWrapper(GetUserMediaTask* task)
      : Runnable("GetUserMediaRunnableWrapper"), mTask(task) {}

  ~GetUserMediaRunnableWrapper() {}

  NS_IMETHOD Run() override {
    mTask->Run();
    return NS_OK;
  }

 private:
  nsAutoPtr<GetUserMediaTask> mTask;
};
#endif

// This function tries to guess the group id for a video device
// based on the device name. If only one audio device's name contains
// the name of the video device, then, this video device will take
// the group id of the audio device. Since this is a guess we try
// to minimize the probability of false positive. If we fail to find
// a correlation we leave the video group id untouched. In that case the
// group id will be the video device name.
/* static */
void MediaManager::GuessVideoDeviceGroupIDs(MediaDeviceSet& aDevices) {
  // Run the logic in a lambda to avoid duplication.
  auto updateGroupIdIfNeeded = [&](RefPtr<MediaDevice>& aVideo,
                                   const MediaDeviceKind aKind) -> bool {
    MOZ_ASSERT(aVideo->mKind == MediaDeviceKind::Videoinput);
    MOZ_ASSERT(aKind == MediaDeviceKind::Audioinput ||
               aKind == MediaDeviceKind::Audiooutput);
    // This will store the new group id if a match is found.
    nsString newVideoGroupID;
    // If the group id needs to be updated this will become true. It is
    // necessary when the new group id is an empty string. Without this extra
    // variable to signal the update, we would resort to test if
    // `newVideoGroupId` is empty. However,
    // that check does not work when the new group id is an empty string.
    bool updateGroupId = false;
    for (const RefPtr<MediaDevice>& dev : aDevices) {
      if (dev->mKind != aKind) {
        continue;
      }
      if (!FindInReadable(aVideo->mName, dev->mName)) {
        continue;
      }
      if (newVideoGroupID.IsEmpty()) {
        // This is only expected on first match. If that's the only match group
        // id will be updated to this one at the end of the loop.
        updateGroupId = true;
        newVideoGroupID = dev->mGroupID;
      } else {
        // More than one device found, it is impossible to know which group id
        // is the correct one.
        updateGroupId = false;
        newVideoGroupID = NS_LITERAL_STRING("");
        break;
      }
    }
    if (updateGroupId) {
      aVideo =
          new MediaDevice(aVideo, aVideo->mID, newVideoGroupID, aVideo->mRawID);
      return true;
    }
    return false;
  };

  for (RefPtr<MediaDevice>& video : aDevices) {
    if (video->mKind != MediaDeviceKind::Videoinput) {
      continue;
    }
    if (updateGroupIdIfNeeded(video, MediaDeviceKind::Audioinput)) {
      // GroupId has been updated, continue to the next video device
      continue;
    }
    // GroupId has not been updated, check among the outputs
    updateGroupIdIfNeeded(video, MediaDeviceKind::Audiooutput);
  }
}

/**
 * EnumerateRawDevices - Enumerate a list of audio & video devices that
 * satisfy passed-in constraints. List contains raw id's.
 */

RefPtr<MediaManager::MgrPromise> MediaManager::EnumerateRawDevices(
    uint64_t aWindowId, MediaSourceEnum aVideoInputType,
    MediaSourceEnum aAudioInputType, MediaSinkEnum aAudioOutputType,
    DeviceEnumerationType aVideoInputEnumType,
    DeviceEnumerationType aAudioInputEnumType, bool aForceNoPermRequest,
    const RefPtr<MediaDeviceSetRefCnt>& aOutDevices) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aVideoInputType != MediaSourceEnum::Other ||
             aAudioInputType != MediaSourceEnum::Other ||
             aAudioOutputType != MediaSinkEnum::Other);
  // Since the enums can take one of several values, the following asserts rely
  // on short circuting behavior. E.g. aVideoInputEnumType != Fake will be true
  // if the requested device is not fake and thus the assert will pass. However,
  // if the device is fake, aVideoInputType == MediaSourceEnum::Camera will be
  // checked as well, ensuring that fake devices are of the camera type.
  MOZ_ASSERT(aVideoInputEnumType != DeviceEnumerationType::Fake ||
                 aVideoInputType == MediaSourceEnum::Camera,
             "If fake cams are requested video type should be camera!");
  MOZ_ASSERT(aVideoInputEnumType != DeviceEnumerationType::Loopback ||
                 aVideoInputType == MediaSourceEnum::Camera,
             "If loopback video is requested video type should be camera!");
  MOZ_ASSERT(aAudioInputEnumType != DeviceEnumerationType::Fake ||
                 aAudioInputType == MediaSourceEnum::Microphone,
             "If fake mics are requested audio type should be microphone!");
  MOZ_ASSERT(aAudioInputEnumType != DeviceEnumerationType::Loopback ||
                 aAudioInputType == MediaSourceEnum::Microphone,
             "If loopback audio is requested audio type should be microphone!");

  LOG("%s: aWindowId=%" PRIu64 ", aVideoInputType=%" PRIu8
      ", aAudioInputType=%" PRIu8 ", aVideoInputEnumType=%" PRIu8
      ", aAudioInputEnumType=%" PRIu8,
      __func__, aWindowId, static_cast<uint8_t>(aVideoInputType),
      static_cast<uint8_t>(aAudioInputType),
      static_cast<uint8_t>(aVideoInputEnumType),
      static_cast<uint8_t>(aAudioInputEnumType));

  auto holder = MakeUnique<MozPromiseHolder<MgrPromise>>();
  RefPtr<MgrPromise> promise = holder->Ensure(__func__);

  bool hasVideo = aVideoInputType != MediaSourceEnum::Other;
  bool hasAudio = aAudioInputType != MediaSourceEnum::Other;
  bool hasAudioOutput = aAudioOutputType == MediaSinkEnum::Speaker;

  // True of at least one of video input or audio input is a fake device
  bool fakeDeviceRequested =
      (aVideoInputEnumType == DeviceEnumerationType::Fake && hasVideo) ||
      (aAudioInputEnumType == DeviceEnumerationType::Fake && hasAudio);
  // True if at least one of video input or audio input is a real device
  // or there is audio output.
  bool realDeviceRequested =
      (aVideoInputEnumType != DeviceEnumerationType::Fake && hasVideo) ||
      (aAudioInputEnumType != DeviceEnumerationType::Fake && hasAudio) ||
      hasAudioOutput;

  nsAutoCString videoLoopDev, audioLoopDev;
  if (hasVideo && aVideoInputEnumType == DeviceEnumerationType::Loopback) {
    Preferences::GetCString("media.video_loopback_dev", videoLoopDev);
  }
  if (hasAudio && aAudioInputEnumType == DeviceEnumerationType::Loopback) {
    Preferences::GetCString("media.audio_loopback_dev", audioLoopDev);
  }

  RefPtr<Runnable> task = NewTaskFrom([holder = std::move(holder), aWindowId,
                                       aVideoInputType, aAudioInputType,
                                       aVideoInputEnumType, aAudioInputEnumType,
                                       videoLoopDev, audioLoopDev, hasVideo,
                                       hasAudio, hasAudioOutput,
                                       fakeDeviceRequested, realDeviceRequested,
                                       aOutDevices]() {
    // Only enumerate what's asked for, and only fake cams and mics.
    RefPtr<MediaEngine> fakeBackend, realBackend;
    if (fakeDeviceRequested) {
      fakeBackend = new MediaEngineDefault();
    }
    if (realDeviceRequested) {
      MediaManager* manager = MediaManager::GetIfExists();
      MOZ_RELEASE_ASSERT(manager);  // Must exist while media thread is alive
      realBackend = manager->GetBackend();
    }

    if (hasVideo) {
      MediaDeviceSet videos;
      LOG("EnumerateRawDevices Task: Getting video sources with %s backend",
          aVideoInputEnumType == DeviceEnumerationType::Fake ? "fake" : "real");
      GetMediaDevices(aVideoInputEnumType == DeviceEnumerationType::Fake
                          ? fakeBackend
                          : realBackend,
                      aWindowId, aVideoInputType, videos, videoLoopDev.get());
      aOutDevices->AppendElements(videos);
    }
    if (hasAudio) {
      MediaDeviceSet audios;
      LOG("EnumerateRawDevices Task: Getting audio sources with %s backend",
          aAudioInputEnumType == DeviceEnumerationType::Fake ? "fake" : "real");
      GetMediaDevices(aAudioInputEnumType == DeviceEnumerationType::Fake
                          ? fakeBackend
                          : realBackend,
                      aWindowId, aAudioInputType, audios, audioLoopDev.get());
      aOutDevices->AppendElements(audios);
    }
    if (hasAudioOutput) {
      MediaDeviceSet outputs;
      MOZ_ASSERT(realBackend);
      realBackend->EnumerateDevices(aWindowId, MediaSourceEnum::Other,
                                    MediaSinkEnum::Speaker, &outputs);
      aOutDevices->AppendElements(outputs);
    }
    if (hasVideo) {
      GuessVideoDeviceGroupIDs(*aOutDevices);
    }

    holder->Resolve(false, __func__);
  });

  if (realDeviceRequested && aForceNoPermRequest &&
      Preferences::GetBool("media.navigator.permission.device", false)) {
    // Need to ask permission to retrieve list of all devices;
    // notify frontend observer and wait for callback notification to post task.
    const char16_t* const type =
        (aVideoInputType != MediaSourceEnum::Camera)
            ? u"audio"
            : (aAudioInputType != MediaSourceEnum::Microphone) ? u"video"
                                                               : u"all";
    nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
    obs->NotifyObservers(static_cast<nsIRunnable*>(task),
                         "getUserMedia:ask-device-permission", type);
  } else {
    // Don't need to ask permission to retrieve list of all devices;
    // post the retrieval task immediately.
    MediaManager::PostTask(task.forget());
  }

  return promise;
}

MediaManager::MediaManager() : mMediaThread(nullptr), mBackend(nullptr) {
  mPrefs.mFreq = 1000;  // 1KHz test tone
  mPrefs.mWidth = 0;    // adaptive default
  mPrefs.mHeight = 0;   // adaptive default
  mPrefs.mFPS = MediaEnginePrefs::DEFAULT_VIDEO_FPS;
  mPrefs.mAecOn = false;
  mPrefs.mUseAecMobile = false;
  mPrefs.mAgcOn = false;
  mPrefs.mNoiseOn = false;
  mPrefs.mExtendedFilter = true;
  mPrefs.mDelayAgnostic = true;
  mPrefs.mFakeDeviceChangeEventOn = false;
#ifdef MOZ_WEBRTC
  mPrefs.mAec =
      webrtc::EchoCancellation::SuppressionLevel::kModerateSuppression;
  mPrefs.mAgc = webrtc::GainControl::Mode::kAdaptiveDigital;
  mPrefs.mNoise = webrtc::NoiseSuppression::Level::kModerate;
#else
  mPrefs.mAec = 0;
  mPrefs.mAgc = 0;
  mPrefs.mNoise = 0;
#endif
  mPrefs.mFullDuplex = false;
  mPrefs.mChannels = 0;  // max channels default
  nsresult rv;
  nsCOMPtr<nsIPrefService> prefs =
      do_GetService("@mozilla.org/preferences-service;1", &rv);
  if (NS_SUCCEEDED(rv)) {
    nsCOMPtr<nsIPrefBranch> branch = do_QueryInterface(prefs);
    if (branch) {
      GetPrefs(branch, nullptr);
    }
  }
  LOG("%s: default prefs: %dx%d @%dfps, %dHz test tones, aec: %s,"
      "agc: %s, noise: %s, aec level: %d, agc level: %d, noise level: %d,"
      "%sfull_duplex, extended aec %s, delay_agnostic %s "
      "channels %d",
      __FUNCTION__, mPrefs.mWidth, mPrefs.mHeight, mPrefs.mFPS, mPrefs.mFreq,
      mPrefs.mAecOn ? "on" : "off", mPrefs.mAgcOn ? "on" : "off",
      mPrefs.mNoiseOn ? "on" : "off", mPrefs.mAec, mPrefs.mAgc, mPrefs.mNoise,
      mPrefs.mFullDuplex ? "" : "not ", mPrefs.mExtendedFilter ? "on" : "off",
      mPrefs.mDelayAgnostic ? "on" : "off", mPrefs.mChannels);
}

NS_IMPL_ISUPPORTS(MediaManager, nsIMediaManagerService, nsIObserver)

/* static */
StaticRefPtr<MediaManager> MediaManager::sSingleton;

#ifdef DEBUG
/* static */
bool MediaManager::IsInMediaThread() {
  return sSingleton ? (sSingleton->mMediaThread->thread_id() ==
                       PlatformThread::CurrentId())
                    : false;
}
#endif

#ifdef XP_WIN
class MTAThread : public base::Thread {
 public:
  explicit MTAThread(const char* aName)
      : base::Thread(aName), mResult(E_FAIL) {}

 protected:
  virtual void Init() override {
    mResult = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
  }

  virtual void CleanUp() override {
    if (SUCCEEDED(mResult)) {
      CoUninitialize();
    }
  }

 private:
  HRESULT mResult;
};
#endif

// NOTE: never Dispatch(....,NS_DISPATCH_SYNC) to the MediaManager
// thread from the MainThread, as we NS_DISPATCH_SYNC to MainThread
// from MediaManager thread.

// Guaranteed never to return nullptr.
/* static */
MediaManager* MediaManager::Get() {
  if (!sSingleton) {
    MOZ_ASSERT(NS_IsMainThread());

    static int timesCreated = 0;
    timesCreated++;
    MOZ_RELEASE_ASSERT(timesCreated == 1);

    sSingleton = new MediaManager();

#ifdef XP_WIN
    sSingleton->mMediaThread = new MTAThread("MediaManager");
#else
    sSingleton->mMediaThread = new base::Thread("MediaManager");
#endif
    base::Thread::Options options;
    options.message_loop_type = MessageLoop::TYPE_MOZILLA_NONMAINTHREAD;
    if (!sSingleton->mMediaThread->StartWithOptions(options)) {
      MOZ_CRASH();
    }

    LOG("New Media thread for gum");

    nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
    if (obs) {
      obs->AddObserver(sSingleton, "last-pb-context-exited", false);
      obs->AddObserver(sSingleton, "getUserMedia:got-device-permission", false);
      obs->AddObserver(sSingleton, "getUserMedia:privileged:allow", false);
      obs->AddObserver(sSingleton, "getUserMedia:response:allow", false);
      obs->AddObserver(sSingleton, "getUserMedia:response:deny", false);
      obs->AddObserver(sSingleton, "getUserMedia:response:noOSPermission",
                       false);
      obs->AddObserver(sSingleton, "getUserMedia:revoke", false);
    }
    // else MediaManager won't work properly and will leak (see bug 837874)
    nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
    if (prefs) {
      prefs->AddObserver("media.navigator.video.default_width", sSingleton,
                         false);
      prefs->AddObserver("media.navigator.video.default_height", sSingleton,
                         false);
      prefs->AddObserver("media.navigator.video.default_fps", sSingleton,
                         false);
      prefs->AddObserver("media.navigator.audio.fake_frequency", sSingleton,
                         false);
      prefs->AddObserver("media.navigator.audio.full_duplex", sSingleton,
                         false);
#ifdef MOZ_WEBRTC
      prefs->AddObserver("media.getusermedia.aec_enabled", sSingleton, false);
      prefs->AddObserver("media.getusermedia.aec", sSingleton, false);
      prefs->AddObserver("media.getusermedia.agc_enabled", sSingleton, false);
      prefs->AddObserver("media.getusermedia.agc", sSingleton, false);
      prefs->AddObserver("media.getusermedia.noise_enabled", sSingleton, false);
      prefs->AddObserver("media.getusermedia.noise", sSingleton, false);
      prefs->AddObserver("media.ondevicechange.fakeDeviceChangeEvent.enabled",
                         sSingleton, false);
      prefs->AddObserver("media.getusermedia.channels", sSingleton, false);
#endif
    }

    // Prepare async shutdown

    class Blocker : public media::ShutdownBlocker {
     public:
      Blocker()
          : media::ShutdownBlocker(
                NS_LITERAL_STRING("Media shutdown: blocking on media thread")) {
      }

      NS_IMETHOD BlockShutdown(nsIAsyncShutdownClient*) override {
        MOZ_RELEASE_ASSERT(MediaManager::GetIfExists());
        MediaManager::GetIfExists()->Shutdown();
        return NS_OK;
      }
    };

    sSingleton->mShutdownBlocker = new Blocker();
    nsresult rv = media::GetShutdownBarrier()->AddBlocker(
        sSingleton->mShutdownBlocker, NS_LITERAL_STRING(__FILE__), __LINE__,
        NS_LITERAL_STRING(""));
    MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
  }
  return sSingleton;
}

/* static */
MediaManager* MediaManager::GetIfExists() { return sSingleton; }

/* static */
already_AddRefed<MediaManager> MediaManager::GetInstance() {
  // so we can have non-refcounted getters
  RefPtr<MediaManager> service = MediaManager::Get();
  return service.forget();
}

media::Parent<media::NonE10s>* MediaManager::GetNonE10sParent() {
  if (!mNonE10sParent) {
    mNonE10sParent = new media::Parent<media::NonE10s>();
  }
  return mNonE10sParent;
}

/* static */
void MediaManager::StartupInit() {
#ifdef WIN32
  if (!IsWin8OrLater()) {
    // Bug 1107702 - Older Windows fail in GetAdaptersInfo (and others) if the
    // first(?) call occurs after the process size is over 2GB (kb/2588507).
    // Attempt to 'prime' the pump by making a call at startup.
    unsigned long out_buf_len = sizeof(IP_ADAPTER_INFO);
    PIP_ADAPTER_INFO pAdapterInfo = (IP_ADAPTER_INFO*)moz_xmalloc(out_buf_len);
    if (GetAdaptersInfo(pAdapterInfo, &out_buf_len) == ERROR_BUFFER_OVERFLOW) {
      free(pAdapterInfo);
      pAdapterInfo = (IP_ADAPTER_INFO*)moz_xmalloc(out_buf_len);
      GetAdaptersInfo(pAdapterInfo, &out_buf_len);
    }
    if (pAdapterInfo) {
      free(pAdapterInfo);
    }
  }
#endif
}

/* static */
void MediaManager::PostTask(already_AddRefed<Runnable> task) {
  if (sHasShutdown) {
    // Can't safely delete task here since it may have items with specific
    // thread-release requirements.
    // XXXkhuey well then who is supposed to delete it?! We don't signal
    // that we failed ...
    MOZ_CRASH();
    return;
  }
  NS_ASSERTION(Get(), "MediaManager singleton?");
  NS_ASSERTION(Get()->mMediaThread, "No thread yet");
  Get()->mMediaThread->message_loop()->PostTask(std::move(task));
}

template <typename MozPromiseType, typename FunctionType>
/* static */
RefPtr<MozPromiseType> MediaManager::PostTask(const char* aName,
                                              FunctionType&& aFunction) {
  MozPromiseHolder<MozPromiseType> holder;
  RefPtr<MozPromiseType> promise = holder.Ensure(aName);
  MediaManager::PostTask(NS_NewRunnableFunction(
      aName, [h = std::move(holder), func = std::forward<FunctionType>(
                                         aFunction)]() mutable { func(h); }));
  return promise;
}

/* static */
nsresult MediaManager::NotifyRecordingStatusChange(
    nsPIDOMWindowInner* aWindow) {
  NS_ENSURE_ARG(aWindow);

  nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
  if (!obs) {
    NS_WARNING(
        "Could not get the Observer service for GetUserMedia recording "
        "notification.");
    return NS_ERROR_FAILURE;
  }

  auto props = MakeRefPtr<nsHashPropertyBag>();

  nsCString pageURL;
  nsCOMPtr<nsIURI> docURI = aWindow->GetDocumentURI();
  NS_ENSURE_TRUE(docURI, NS_ERROR_FAILURE);

  nsresult rv = docURI->GetSpec(pageURL);
  NS_ENSURE_SUCCESS(rv, rv);

  NS_ConvertUTF8toUTF16 requestURL(pageURL);

  props->SetPropertyAsAString(NS_LITERAL_STRING("requestURL"), requestURL);

  obs->NotifyObservers(static_cast<nsIPropertyBag2*>(props),
                       "recording-device-events", nullptr);
  LOG("Sent recording-device-events for url '%s'", pageURL.get());

  return NS_OK;
}

int MediaManager::AddDeviceChangeCallback(DeviceChangeCallback* aCallback) {
  bool fakeDeviceChangeEventOn = mPrefs.mFakeDeviceChangeEventOn;
  MediaManager::PostTask(NewTaskFrom([fakeDeviceChangeEventOn]() {
    MediaManager* manager = MediaManager::GetIfExists();
    MOZ_RELEASE_ASSERT(manager);  // Must exist while media thread is alive
    // this is needed in case persistent permission is given but no gUM()
    // or enumeration() has created the real backend yet
    manager->GetBackend();
    if (fakeDeviceChangeEventOn)
      manager->GetBackend()->SetFakeDeviceChangeEvents();
  }));

  return DeviceChangeCallback::AddDeviceChangeCallback(aCallback);
}

void MediaManager::OnDeviceChange() {
  NS_DispatchToMainThread(NS_NewRunnableFunction(
      "MediaManager::OnDeviceChange", [self = RefPtr<MediaManager>(this)]() {
        MOZ_ASSERT(NS_IsMainThread());
        if (sHasShutdown) {
          return;
        }
        self->DeviceChangeCallback::OnDeviceChange();

        // On some Windows machine, if we call EnumerateRawDevices immediately
        // after receiving devicechange event, sometimes we would get outdated
        // devices list.
        PR_Sleep(PR_MillisecondsToInterval(200));
        auto devices = MakeRefPtr<MediaDeviceSetRefCnt>();
        self->EnumerateRawDevices(
                0, MediaSourceEnum::Camera, MediaSourceEnum::Microphone,
                MediaSinkEnum::Speaker, DeviceEnumerationType::Normal,
                DeviceEnumerationType::Normal, false, devices)
            ->Then(
                GetCurrentThreadSerialEventTarget(), __func__,
                [self, devices](bool) {
                  if (!MediaManager::GetIfExists()) {
                    return;
                  }

                  nsTArray<nsString> deviceIDs;

                  for (auto& device : *devices) {
                    nsString id;
                    device->GetId(id);
                    id.ReplaceSubstring(NS_LITERAL_STRING("default: "),
                                        NS_LITERAL_STRING(""));
                    if (!deviceIDs.Contains(id)) {
                      deviceIDs.AppendElement(id);
                    }
                  }

                  for (auto& id : self->mDeviceIDs) {
                    if (deviceIDs.Contains(id)) {
                      continue;
                    }

                    // Stop the coresponding SourceListener
                    nsGlobalWindowInner::InnerWindowByIdTable* windowsById =
                        nsGlobalWindowInner::GetWindowsTable();
                    if (!windowsById) {
                      continue;
                    }

                    for (auto iter = windowsById->Iter(); !iter.Done();
                         iter.Next()) {
                      nsGlobalWindowInner* window = iter.Data();
                      self->IterateWindowListeners(
                          window,
                          [&id](const RefPtr<GetUserMediaWindowListener>&
                                    aListener) { aListener->StopRawID(id); });
                    }
                  }

                  self->mDeviceIDs = deviceIDs;
                },
                [](RefPtr<MediaMgrError>&& reason) {});
      }));
}

nsresult MediaManager::GenerateUUID(nsAString& aResult) {
  nsresult rv;
  nsCOMPtr<nsIUUIDGenerator> uuidgen =
      do_GetService("@mozilla.org/uuid-generator;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  // Generate a call ID.
  nsID id;
  rv = uuidgen->GenerateUUIDInPlace(&id);
  NS_ENSURE_SUCCESS(rv, rv);

  char buffer[NSID_LENGTH];
  id.ToProvidedString(buffer);
  aResult.Assign(NS_ConvertUTF8toUTF16(buffer));
  return NS_OK;
}

static bool IsFullyActive(nsPIDOMWindowInner* aWindow) {
  while (true) {
    if (!aWindow) {
      return false;
    }
    Document* document = aWindow->GetExtantDoc();
    if (!document) {
      return false;
    }
    if (!document->IsCurrentActiveDocument()) {
      return false;
    }
    nsPIDOMWindowOuter* context = aWindow->GetOuterWindow();
    if (!context) {
      return false;
    }
    if (context->IsTopLevelWindow()) {
      return true;
    }
    nsCOMPtr<Element> frameElement =
        nsGlobalWindowOuter::Cast(context)->GetRealFrameElementOuter();
    if (!frameElement) {
      return false;
    }
    aWindow = frameElement->OwnerDoc()->GetInnerWindow();
  }
}

enum class GetUserMediaSecurityState {
  Other = 0,
  HTTPS = 1,
  File = 2,
  App = 3,
  Localhost = 4,
  Loop = 5,
  Privileged = 6
};

/**
 * This function is used in getUserMedia when privacy.resistFingerprinting is
 * true. Only mediaSource of audio/video constraint will be kept.
 */
static void ReduceConstraint(
    OwningBooleanOrMediaTrackConstraints& aConstraint) {
  // Not requesting stream.
  if (!IsOn(aConstraint)) {
    return;
  }

  // It looks like {audio: true}, do nothing.
  if (!aConstraint.IsMediaTrackConstraints()) {
    return;
  }

  // Keep mediaSource, ignore all other constraints.
  Maybe<nsString> mediaSource;
  if (aConstraint.GetAsMediaTrackConstraints().mMediaSource.WasPassed()) {
    mediaSource =
        Some(aConstraint.GetAsMediaTrackConstraints().mMediaSource.Value());
  }
  if (mediaSource) {
    aConstraint.SetAsMediaTrackConstraints().mMediaSource.Value() =
        *mediaSource;
  } else {
    aConstraint.SetAsMediaTrackConstraints();
  }
}

/**
 * The entry point for this file. A call from Navigator::mozGetUserMedia
 * will end up here. MediaManager is a singleton that is responsible
 * for handling all incoming getUserMedia calls from every window.
 */
RefPtr<MediaManager::StreamPromise> MediaManager::GetUserMedia(
    nsPIDOMWindowInner* aWindow,
    const MediaStreamConstraints& aConstraintsPassedIn,
    CallerType aCallerType) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aWindow);
  uint64_t windowID = aWindow->WindowID();

  MediaStreamConstraints c(aConstraintsPassedIn);  // use a modifiable copy

  // Do all the validation we can while we're sync (to return an
  // already-rejected promise on failure).

  if (!IsOn(c.mVideo) && !IsOn(c.mAudio)) {
    return StreamPromise::CreateAndReject(
        MakeRefPtr<MediaMgrError>(
            MediaMgrError::Name::TypeError,
            NS_LITERAL_STRING("audio and/or video is required")),
        __func__);
  }

  if (!IsFullyActive(aWindow)) {
    return StreamPromise::CreateAndReject(
        MakeRefPtr<MediaMgrError>(MediaMgrError::Name::InvalidStateError),
        __func__);
  }

  if (sHasShutdown) {
    return StreamPromise::CreateAndReject(
        MakeRefPtr<MediaMgrError>(MediaMgrError::Name::AbortError,
                                  NS_LITERAL_STRING("In shutdown")),
        __func__);
  }

  // Determine permissions early (while we still have a stack).

  nsIURI* docURI = aWindow->GetDocumentURI();
  if (!docURI) {
    return StreamPromise::CreateAndReject(
        MakeRefPtr<MediaMgrError>(MediaMgrError::Name::AbortError), __func__);
  }
  bool isChrome = (aCallerType == CallerType::System);
  bool privileged =
      isChrome ||
      Preferences::GetBool("media.navigator.permission.disabled", false);
  bool isSecure = aWindow->IsSecureContext();
  // Note: isHTTPS is for legacy telemetry only! Use isSecure for security, as
  // it handles things like https iframes in http pages correctly.
  bool isHTTPS = false;
  bool isHandlingUserInput = EventStateManager::IsHandlingUserInput();
  docURI->SchemeIs("https", &isHTTPS);
  nsCString host;
  nsresult rv = docURI->GetHost(host);
  // Test for some other schemes that ServiceWorker recognizes
  bool isFile;
  docURI->SchemeIs("file", &isFile);
  bool isApp;
  docURI->SchemeIs("app", &isApp);
  // Same localhost check as ServiceWorkers uses
  // (see IsOriginPotentiallyTrustworthy())
  bool isLocalhost =
      NS_SUCCEEDED(rv) && (host.LowerCaseEqualsLiteral("localhost") ||