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-rw-r--r--dom/media/webaudio/MediaStreamTrackAudioSourceNode.cpp200
1 files changed, 200 insertions, 0 deletions
diff --git a/dom/media/webaudio/MediaStreamTrackAudioSourceNode.cpp b/dom/media/webaudio/MediaStreamTrackAudioSourceNode.cpp
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index 0000000000..f3948a33ad
--- /dev/null
+++ b/dom/media/webaudio/MediaStreamTrackAudioSourceNode.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=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 "MediaStreamTrackAudioSourceNode.h"
+#include "mozilla/dom/MediaStreamTrackAudioSourceNodeBinding.h"
+#include "AudioNodeEngine.h"
+#include "AudioNodeExternalInputTrack.h"
+#include "AudioStreamTrack.h"
+#include "mozilla/dom/Document.h"
+#include "nsContentUtils.h"
+#include "nsIScriptError.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(MediaStreamTrackAudioSourceNode)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(MediaStreamTrackAudioSourceNode)
+ tmp->Destroy();
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mInputTrack)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_PTR
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(AudioNode)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(
+ MediaStreamTrackAudioSourceNode, AudioNode)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mInputTrack)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaStreamTrackAudioSourceNode)
+NS_INTERFACE_MAP_END_INHERITING(AudioNode)
+
+NS_IMPL_ADDREF_INHERITED(MediaStreamTrackAudioSourceNode, AudioNode)
+NS_IMPL_RELEASE_INHERITED(MediaStreamTrackAudioSourceNode, AudioNode)
+
+MediaStreamTrackAudioSourceNode::MediaStreamTrackAudioSourceNode(
+ AudioContext* aContext)
+ : AudioNode(aContext, 2, ChannelCountMode::Max,
+ ChannelInterpretation::Speakers),
+ mTrackListener(this) {}
+
+/* static */ already_AddRefed<MediaStreamTrackAudioSourceNode>
+MediaStreamTrackAudioSourceNode::Create(
+ AudioContext& aAudioContext,
+ const MediaStreamTrackAudioSourceOptions& aOptions, ErrorResult& aRv) {
+ // The spec has a pointless check here. See
+ // https://github.com/WebAudio/web-audio-api/issues/2149
+ MOZ_RELEASE_ASSERT(!aAudioContext.IsOffline(), "Bindings messed up?");
+
+ if (!aOptions.mMediaStreamTrack->Ended() &&
+ aAudioContext.Graph() != aOptions.mMediaStreamTrack->Graph()) {
+ nsCOMPtr<nsPIDOMWindowInner> pWindow = aAudioContext.GetParentObject();
+ Document* document = pWindow ? pWindow->GetExtantDoc() : nullptr;
+ nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "Web Audio"_ns,
+ document, nsContentUtils::eDOM_PROPERTIES,
+ "MediaStreamAudioSourceNodeDifferentRate");
+ // This is not a spec-required exception, just a limitation of our
+ // implementation.
+ aRv.ThrowNotSupportedError(
+ "Connecting AudioNodes from AudioContexts with different sample-rate "
+ "is currently not supported.");
+ return nullptr;
+ }
+
+ RefPtr<MediaStreamTrackAudioSourceNode> node =
+ new MediaStreamTrackAudioSourceNode(&aAudioContext);
+
+ node->Init(aOptions.mMediaStreamTrack, aRv);
+ if (aRv.Failed()) {
+ return nullptr;
+ }
+
+ return node.forget();
+}
+
+void MediaStreamTrackAudioSourceNode::Init(MediaStreamTrack* aMediaStreamTrack,
+ ErrorResult& aRv) {
+ MOZ_ASSERT(aMediaStreamTrack);
+
+ if (!aMediaStreamTrack->AsAudioStreamTrack()) {
+ aRv.ThrowInvalidStateError("\"mediaStreamTrack\" must be an audio track");
+ return;
+ }
+
+ if (aMediaStreamTrack->Ended()) {
+ // The track is ended and will never produce any data. Pretend like this is
+ // fine.
+ return;
+ }
+
+ MarkActive();
+
+ MediaTrackGraph* graph = Context()->Graph();
+
+ AudioNodeEngine* engine = new MediaStreamTrackAudioSourceNodeEngine(this);
+ mTrack = AudioNodeExternalInputTrack::Create(graph, engine);
+
+ MOZ_ASSERT(mTrack);
+
+ mInputTrack = aMediaStreamTrack;
+ ProcessedMediaTrack* outputTrack =
+ static_cast<ProcessedMediaTrack*>(mTrack.get());
+ mInputPort = mInputTrack->ForwardTrackContentsTo(outputTrack);
+ PrincipalChanged(mInputTrack); // trigger enabling/disabling of the connector
+ mInputTrack->AddPrincipalChangeObserver(this);
+
+ mInputTrack->AddConsumer(&mTrackListener);
+}
+
+void MediaStreamTrackAudioSourceNode::Destroy() {
+ if (mInputTrack) {
+ mTrackListener.NotifyEnded(mInputTrack);
+ mInputTrack->RemovePrincipalChangeObserver(this);
+ mInputTrack->RemoveConsumer(&mTrackListener);
+ mInputTrack = nullptr;
+ }
+
+ if (mInputPort) {
+ mInputPort->Destroy();
+ mInputPort = nullptr;
+ }
+}
+
+MediaStreamTrackAudioSourceNode::~MediaStreamTrackAudioSourceNode() {
+ Destroy();
+}
+
+/**
+ * Changes the principal. Note that this will be called on the main thread, but
+ * changes will be enacted on the MediaTrackGraph thread. If the principal
+ * change results in the document principal losing access to the track, then
+ * there needs to be other measures in place to ensure that any media that is
+ * governed by the new track principal is not available to the MediaTrackGraph
+ * 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 MediaTrackGraph 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 MediaStreamTrackAudioSourceNode::PrincipalChanged(
+ MediaStreamTrack* aMediaStreamTrack) {
+ MOZ_ASSERT(aMediaStreamTrack == mInputTrack);
+
+ bool subsumes = false;
+ Document* 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 track = static_cast<AudioNodeExternalInputTrack*>(mTrack.get());
+ bool enabled = subsumes;
+ track->SetInt32Parameter(MediaStreamTrackAudioSourceNodeEngine::ENABLE,
+ enabled);
+ fprintf(stderr, "NOW: %s", enabled ? "enabled" : "disabled");
+
+ if (!enabled && doc) {
+ nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "Web Audio"_ns,
+ doc, nsContentUtils::eDOM_PROPERTIES,
+ CrossOriginErrorString());
+ }
+}
+
+size_t MediaStreamTrackAudioSourceNode::SizeOfExcludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
+ if (mInputPort) {
+ amount += mInputPort->SizeOfIncludingThis(aMallocSizeOf);
+ }
+ return amount;
+}
+
+size_t MediaStreamTrackAudioSourceNode::SizeOfIncludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
+}
+
+void MediaStreamTrackAudioSourceNode::DestroyMediaTrack() {
+ if (mInputPort) {
+ mInputPort->Destroy();
+ mInputPort = nullptr;
+ }
+ AudioNode::DestroyMediaTrack();
+}
+
+JSObject* MediaStreamTrackAudioSourceNode::WrapObject(
+ JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+ return MediaStreamTrackAudioSourceNode_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+} // namespace mozilla::dom