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/* -*- 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 "AudioNodeExternalInputTrack.h"
#include "AudioStreamTrack.h"
#include "mozilla/dom/Document.h"
#include "nsContentUtils.h"
#include "nsIScriptError.h"
#include "nsID.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(MediaStreamAudioSourceNode)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)
NS_IMPL_ADDREF_INHERITED(MediaStreamAudioSourceNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(MediaStreamAudioSourceNode, AudioNode)
MediaStreamAudioSourceNode::MediaStreamAudioSourceNode(
AudioContext* aContext, TrackChangeBehavior aBehavior)
: AudioNode(aContext, 2, ChannelCountMode::Max,
ChannelInterpretation::Speakers),
mBehavior(aBehavior) {}
/* static */
already_AddRefed<MediaStreamAudioSourceNode> MediaStreamAudioSourceNode::Create(
AudioContext& aAudioContext, const MediaStreamAudioSourceOptions& aOptions,
ErrorResult& aRv) {
// The spec has a pointless check here. See
MOZ_RELEASE_ASSERT(!aAudioContext.IsOffline(), "Bindings messed up?");
RefPtr<MediaStreamAudioSourceNode> node =
new MediaStreamAudioSourceNode(&aAudioContext, LockOnTrackPicked);
// aOptions.mMediaStream is not nullable.
node->Init(*aOptions.mMediaStream, aRv);
if (aRv.Failed()) {
return nullptr;
}
return node.forget();
}
void MediaStreamAudioSourceNode::Init(DOMMediaStream& aMediaStream,
ErrorResult& aRv) {
mInputStream = &aMediaStream;
AudioNodeEngine* engine = new MediaStreamAudioSourceNodeEngine(this);
mTrack = AudioNodeExternalInputTrack::Create(Context()->Graph(), engine);
mInputStream->AddConsumerToKeepAlive(ToSupports(this));
mInputStream->RegisterTrackListener(this);
if (mInputStream->Audible()) {
NotifyAudible();
}
AttachToRightTrack(mInputStream, aRv);
}
void MediaStreamAudioSourceNode::Destroy() {
if (mInputStream) {
mInputStream->UnregisterTrackListener(this);
mInputStream = nullptr;
}
DetachFromTrack();
}
MediaStreamAudioSourceNode::~MediaStreamAudioSourceNode() { Destroy(); }
void MediaStreamAudioSourceNode::AttachToTrack(
const RefPtr<MediaStreamTrack>& aTrack, ErrorResult& aRv) {
MOZ_ASSERT(!mInputTrack);
MOZ_ASSERT(aTrack->AsAudioStreamTrack());
MOZ_DIAGNOSTIC_ASSERT(!aTrack->Ended());
if (!mTrack) {
return;
}
if (NS_WARN_IF(Context()->Graph() != aTrack->Graph())) {
nsCOMPtr<nsPIDOMWindowInner> pWindow = Context()->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;
}
mInputTrack = aTrack;
ProcessedMediaTrack* outputTrack =
static_cast<ProcessedMediaTrack*>(mTrack.get());
mInputPort = mInputTrack->ForwardTrackContentsTo(outputTrack);
PrincipalChanged(mInputTrack); // trigger enabling/disabling of the connector
mInputTrack->AddPrincipalChangeObserver(this);
MarkActive();
}
void MediaStreamAudioSourceNode::DetachFromTrack() {
if (mInputTrack) {
mInputTrack->RemovePrincipalChangeObserver(this);
mInputTrack = nullptr;
}
if (mInputPort) {
mInputPort->Destroy();
mInputPort = nullptr;
}
}
static int AudioTrackCompare(const RefPtr<AudioStreamTrack>& aLhs,
const RefPtr<AudioStreamTrack>& aRhs) {
nsAutoStringN<NSID_LENGTH> IDLhs;
nsAutoStringN<NSID_LENGTH> IDRhs;
aLhs->GetId(IDLhs);
aRhs->GetId(IDRhs);
return NS_ConvertUTF16toUTF8(IDLhs).Compare(
NS_ConvertUTF16toUTF8(IDRhs).get());
}
void MediaStreamAudioSourceNode::AttachToRightTrack(
const RefPtr<DOMMediaStream>& aMediaStream, ErrorResult& aRv) {
nsTArray<RefPtr<AudioStreamTrack>> tracks;
aMediaStream->GetAudioTracks(tracks);
if (tracks.IsEmpty() && mBehavior == LockOnTrackPicked) {
aRv.ThrowInvalidStateError("No audio tracks in MediaStream");
return;
}
// Sort the track to have a stable order, on their ID by lexicographic
// ordering on sequences of code unit values.
tracks.Sort(AudioTrackCompare);
for (const RefPtr<AudioStreamTrack>& track : tracks) {
if (mBehavior == FollowChanges) {
if (track->Ended()) {
continue;
}
}
if (!track->Ended()) {
AttachToTrack(track, aRv);
}
return;
}
// There was no track available. We'll allow the node to be garbage collected.
MarkInactive();
}
void MediaStreamAudioSourceNode::NotifyTrackAdded(
const RefPtr<MediaStreamTrack>& aTrack) {
if (mBehavior != FollowChanges) {
return;
}
if (mInputTrack) {
return;
}
if (!aTrack->AsAudioStreamTrack()) {
return;
}
AttachToTrack(aTrack, IgnoreErrors());
}
void MediaStreamAudioSourceNode::NotifyTrackRemoved(
const RefPtr<MediaStreamTrack>& aTrack) {
if (mBehavior == FollowChanges) {
if (aTrack != mInputTrack) {
return;
}
DetachFromTrack();
AttachToRightTrack(mInputStream, IgnoreErrors());
}
}
void MediaStreamAudioSourceNode::NotifyAudible() {
MOZ_ASSERT(mInputStream);
Context()->StartBlockedAudioContextIfAllowed();
}
/**
* 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 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 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 MediaStreamAudioSourceNode::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(MediaStreamAudioSourceNodeEngine::ENABLE, enabled);
if (!enabled && doc) {
nsContentUtils::ReportToConsole(nsIScriptError::warningFlag, "Web Audio"_ns,
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::DestroyMediaTrack() {
if (mInputPort) {
mInputPort->Destroy();
mInputPort = nullptr;
}
AudioNode::DestroyMediaTrack();
}
JSObject* MediaStreamAudioSourceNode::WrapObject(
JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return MediaStreamAudioSourceNode_Binding::Wrap(aCx, this, aGivenProto);
}
} // namespace dom
} // namespace mozilla