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.

Header

Mercurial (d38398e5144e)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "MediaStreamAudioSourceNode.h"
#include "mozilla/dom/MediaStreamAudioSourceNodeBinding.h"
#include "AudioNodeEngine.h"
#include "AudioNodeExternalInputStream.h"
#include "AudioStreamTrack.h"
#include "nsIDocument.h"
#include "mozilla/CORSMode.h"

namespace mozilla {
namespace dom {

NS_IMPL_CYCLE_COLLECTION_CLASS(MediaStreamAudioSourceNode)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(MediaStreamAudioSourceNode)
  tmp->Destroy();
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mInputStream)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mInputTrack)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(AudioNode)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MediaStreamAudioSourceNode, AudioNode)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInputStream)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInputTrack)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(MediaStreamAudioSourceNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)

NS_IMPL_ADDREF_INHERITED(MediaStreamAudioSourceNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(MediaStreamAudioSourceNode, AudioNode)

MediaStreamAudioSourceNode::MediaStreamAudioSourceNode(AudioContext* aContext)
  : AudioNode(aContext,
              2,
              ChannelCountMode::Max,
              ChannelInterpretation::Speakers)
{
}

/* static */ already_AddRefed<MediaStreamAudioSourceNode>
MediaStreamAudioSourceNode::Create(AudioContext& aAudioContext,
                                   const MediaStreamAudioSourceOptions& aOptions,
                                   ErrorResult& aRv)
{
  if (aAudioContext.IsOffline()) {
    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
    return nullptr;
  }

  if (aAudioContext.CheckClosed(aRv)) {
    return nullptr;
  }

  RefPtr<MediaStreamAudioSourceNode> node =
    new MediaStreamAudioSourceNode(&aAudioContext);

  node->Init(aOptions.mMediaStream, aRv);
  if (aRv.Failed()) {
    return nullptr;
  }

  return node.forget();
}

void
MediaStreamAudioSourceNode::Init(DOMMediaStream* aMediaStream, ErrorResult& aRv)
{
  if (!aMediaStream) {
    aRv.Throw(NS_ERROR_FAILURE);
    return;
  }

  MediaStream* inputStream = aMediaStream->GetPlaybackStream();
  MediaStreamGraph* graph = Context()->Graph();
  if (NS_WARN_IF(graph != inputStream->Graph())) {
    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
    return;
  }

  mInputStream = aMediaStream;
  AudioNodeEngine* engine = new MediaStreamAudioSourceNodeEngine(this);
  mStream =
    AudioNodeExternalInputStream::Create(graph, engine,
                                         aMediaStream->AbstractMainThread());
  mInputStream->AddConsumerToKeepAlive(static_cast<nsIDOMEventTarget*>(this));

  mInputStream->RegisterTrackListener(this);
  AttachToFirstTrack(mInputStream);
}

void
MediaStreamAudioSourceNode::Destroy()
{
  if (mInputStream) {
    mInputStream->UnregisterTrackListener(this);
    mInputStream = nullptr;
  }
  DetachFromTrack();
}

MediaStreamAudioSourceNode::~MediaStreamAudioSourceNode()
{
  Destroy();
}

void
MediaStreamAudioSourceNode::AttachToTrack(const RefPtr<MediaStreamTrack>& aTrack)
{
  MOZ_ASSERT(!mInputTrack);
  MOZ_ASSERT(aTrack->AsAudioStreamTrack());

  if (!mStream) {
    return;
  }

  mInputTrack = aTrack;
  ProcessedMediaStream* outputStream =
    static_cast<ProcessedMediaStream*>(mStream.get());
  mInputPort = mInputTrack->ForwardTrackContentsTo(outputStream);
  PrincipalChanged(mInputTrack); // trigger enabling/disabling of the connector
  mInputTrack->AddPrincipalChangeObserver(this);
}

void
MediaStreamAudioSourceNode::DetachFromTrack()
{
  if (mInputTrack) {
    mInputTrack->RemovePrincipalChangeObserver(this);
    mInputTrack = nullptr;
  }
  if (mInputPort) {
    mInputPort->Destroy();
    mInputPort = nullptr;
  }
}

void
MediaStreamAudioSourceNode::AttachToFirstTrack(const RefPtr<DOMMediaStream>& aMediaStream)
{
  nsTArray<RefPtr<AudioStreamTrack>> tracks;
  aMediaStream->GetAudioTracks(tracks);

  for (const RefPtr<AudioStreamTrack>& track : tracks) {
    if (track->Ended()) {
      continue;
    }

    AttachToTrack(track);
    MarkActive();
    return;
  }

  // There was no track available. We'll allow the node to be garbage collected.
  MarkInactive();
}

void
MediaStreamAudioSourceNode::NotifyTrackAdded(const RefPtr<MediaStreamTrack>& aTrack)
{
  if (mInputTrack) {
    return;
  }

  if (!aTrack->AsAudioStreamTrack()) {
    return;
  }

  AttachToTrack(aTrack);
}

void
MediaStreamAudioSourceNode::NotifyTrackRemoved(const RefPtr<MediaStreamTrack>& aTrack)
{
  if (aTrack != mInputTrack) {
    return;
  }

  DetachFromTrack();
  AttachToFirstTrack(mInputStream);
}

/**
 * Changes the principal. Note that this will be called on the main thread, but
 * changes will be enacted on the MediaStreamGraph thread. If the principal
 * change results in the document principal losing access to the stream, then
 * there needs to be other measures in place to ensure that any media that is
 * governed by the new stream principal is not available to the MediaStreamGraph
 * before this change completes. Otherwise, a site could get access to
 * media that they are not authorized to receive.
 *
 * One solution is to block the altered content, call this method, then dispatch
 * another change request to the MediaStreamGraph thread that allows the content
 * under the new principal to flow. This might be unnecessary if the principal
 * change is changing to be the document principal.
 */
void
MediaStreamAudioSourceNode::PrincipalChanged(MediaStreamTrack* aMediaStreamTrack)
{
  MOZ_ASSERT(aMediaStreamTrack == mInputTrack);

  bool subsumes = false;
  nsIDocument* doc = nullptr;
  if (nsPIDOMWindowInner* parent = Context()->GetParentObject()) {
    doc = parent->GetExtantDoc();
    if (doc) {
      nsIPrincipal* docPrincipal = doc->NodePrincipal();
      nsIPrincipal* trackPrincipal = aMediaStreamTrack->GetPrincipal();
      if (!trackPrincipal || NS_FAILED(docPrincipal->Subsumes(trackPrincipal, &subsumes))) {
        subsumes = false;
      }
    }
  }
  auto stream = static_cast<AudioNodeExternalInputStream*>(mStream.get());
  bool enabled = subsumes || aMediaStreamTrack->GetCORSMode() != CORS_NONE;
  stream->SetInt32Parameter(MediaStreamAudioSourceNodeEngine::ENABLE, enabled);

  if (!enabled && doc) {
    nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
                                    NS_LITERAL_CSTRING("Web Audio"),
                                    doc,
                                    nsContentUtils::eDOM_PROPERTIES,
                                    CrossOriginErrorString());
  }
}

size_t
MediaStreamAudioSourceNode::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
{
  // Future:
  // - mInputStream
  size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
  if (mInputPort) {
    amount += mInputPort->SizeOfIncludingThis(aMallocSizeOf);
  }
  return amount;
}

size_t
MediaStreamAudioSourceNode::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}

void
MediaStreamAudioSourceNode::DestroyMediaStream()
{
  if (mInputPort) {
    mInputPort->Destroy();
    mInputPort = nullptr;
  }
  AudioNode::DestroyMediaStream();
}

JSObject*
MediaStreamAudioSourceNode::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return MediaStreamAudioSourceNodeBinding::Wrap(aCx, this, aGivenProto);
}

} // namespace dom
} // namespace mozilla