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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsContentUtils.h"
#include "nsIDocument.h"
#include "nsIScriptError.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* aContext,
DOMMediaStream* aStream, ErrorResult& aRv)
{
RefPtr<MediaStreamAudioSourceNode> node =
new MediaStreamAudioSourceNode(aContext);
node->Init(aStream, 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);
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
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