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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 "MediaStreamTrack.h"
#include "DOMMediaStream.h"
#include "MediaSegment.h"
#include "MediaStreamError.h"
#include "MediaTrackGraphImpl.h"
#include "MediaTrackListener.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/dom/Promise.h"
#include "nsContentUtils.h"
#include "nsGlobalWindowInner.h"
#include "nsIUUIDGenerator.h"
#include "nsServiceManagerUtils.h"
#include "systemservices/MediaUtils.h"
#ifdef LOG
# undef LOG
#endif
static mozilla::LazyLogModule gMediaStreamTrackLog("MediaStreamTrack");
#define LOG(type, msg) MOZ_LOG(gMediaStreamTrackLog, type, msg)
using namespace mozilla::media;
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaStreamTrackSource)
NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaStreamTrackSource)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaStreamTrackSource)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_CLASS(MediaStreamTrackSource)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(MediaStreamTrackSource)
tmp->Destroy();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPrincipal)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(MediaStreamTrackSource)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrincipal)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
auto MediaStreamTrackSource::ApplyConstraints(
const dom::MediaTrackConstraints& aConstraints, CallerType aCallerType)
-> RefPtr<ApplyConstraintsPromise> {
return ApplyConstraintsPromise::CreateAndReject(
MakeRefPtr<MediaMgrError>(MediaMgrError::Name::OverconstrainedError,
u""_ns),
__func__);
}
/**
* MTGListener monitors state changes of the media flowing through the
* MediaTrackGraph.
*
*
* For changes to PrincipalHandle the following applies:
*
* When the main thread principal for a MediaStreamTrack changes, its principal
* will be set to the combination of the previous principal and the new one.
*
* As a PrincipalHandle change later happens on the MediaTrackGraph thread, we
* will be notified. If the latest principal on main thread matches the
* PrincipalHandle we just saw on MTG thread, we will set the track's principal
* to the new one.
*
* We know at this point that the old principal has been flushed out and data
* under it cannot leak to consumers.
*
* In case of multiple changes to the main thread state, the track's principal
* will be a combination of its old principal and all the new ones until the
* latest main thread principal matches the PrincipalHandle on the MTG thread.
*/
class MediaStreamTrack::MTGListener : public MediaTrackListener {
public:
explicit MTGListener(MediaStreamTrack* aTrack) : mTrack(aTrack) {}
void DoNotifyPrincipalHandleChanged(
const PrincipalHandle& aNewPrincipalHandle) {
MOZ_ASSERT(NS_IsMainThread());
if (!mTrack) {
return;
}
mTrack->NotifyPrincipalHandleChanged(aNewPrincipalHandle);
}
void NotifyPrincipalHandleChanged(
MediaTrackGraph* aGraph,
const PrincipalHandle& aNewPrincipalHandle) override {
aGraph->DispatchToMainThreadStableState(
NewRunnableMethod<StoreCopyPassByConstLRef<PrincipalHandle>>(
"dom::MediaStreamTrack::MTGListener::"
"DoNotifyPrincipalHandleChanged",
this, &MTGListener::DoNotifyPrincipalHandleChanged,
aNewPrincipalHandle));
}
void NotifyRemoved(MediaTrackGraph* aGraph) override {
// `mTrack` is a WeakPtr and must be destroyed on main thread.
// We dispatch ourselves to main thread here in case the MediaTrackGraph
// is holding the last reference to us.
aGraph->DispatchToMainThreadStableState(
NS_NewRunnableFunction("MediaStreamTrack::MTGListener::mTrackReleaser",
[self = RefPtr<MTGListener>(this)]() {}));
}
void DoNotifyEnded() {
MOZ_ASSERT(NS_IsMainThread());
if (!mTrack) {
return;
}
if (!mTrack->GetParentObject()) {
return;
}
AbstractThread* mainThread =
nsGlobalWindowInner::Cast(mTrack->GetParentObject())
->AbstractMainThreadFor(TaskCategory::Other);
mainThread->Dispatch(NewRunnableMethod("MediaStreamTrack::OverrideEnded",
mTrack.get(),
&MediaStreamTrack::OverrideEnded));
}
void NotifyEnded(MediaTrackGraph* aGraph) override {
aGraph->DispatchToMainThreadStableState(
NewRunnableMethod("MediaStreamTrack::MTGListener::DoNotifyEnded", this,
&MTGListener::DoNotifyEnded));
}
protected:
// Main thread only.
WeakPtr<MediaStreamTrack> mTrack;
};
class MediaStreamTrack::TrackSink : public MediaStreamTrackSource::Sink {
public:
explicit TrackSink(MediaStreamTrack* aTrack) : mTrack(aTrack) {}
/**
* Keep the track source alive. This track and any clones are controlling the
* lifetime of the source by being registered as its sinks.
*/
bool KeepsSourceAlive() const override { return true; }
bool Enabled() const override {
if (!mTrack) {
return false;
}
return mTrack->Enabled();
}
void PrincipalChanged() override {
if (mTrack) {
mTrack->PrincipalChanged();
}
}
void MutedChanged(bool aNewState) override {
if (mTrack) {
mTrack->MutedChanged(aNewState);
}
}
void OverrideEnded() override {
if (mTrack) {
mTrack->OverrideEnded();
}
}
private:
WeakPtr<MediaStreamTrack> mTrack;
};
MediaStreamTrack::MediaStreamTrack(nsPIDOMWindowInner* aWindow,
mozilla::MediaTrack* aInputTrack,
MediaStreamTrackSource* aSource,
MediaStreamTrackState aReadyState,
bool aMuted,
const MediaTrackConstraints& aConstraints)
: mWindow(aWindow),
mInputTrack(aInputTrack),
mSource(aSource),
mSink(MakeUnique<TrackSink>(this)),
mPrincipal(aSource->GetPrincipal()),
mReadyState(aReadyState),
mEnabled(true),
mMuted(aMuted),
mConstraints(aConstraints) {
if (!Ended()) {
GetSource().RegisterSink(mSink.get());
// Even if the input track is destroyed we need mTrack so that methods
// like AddListener still work. Keeping the number of paths to a minimum
// also helps prevent bugs elsewhere. We'll be ended through the
// MediaStreamTrackSource soon enough.
auto graph = mInputTrack->IsDestroyed()
? MediaTrackGraph::GetInstanceIfExists(
mWindow, mInputTrack->mSampleRate,
MediaTrackGraph::DEFAULT_OUTPUT_DEVICE)
: mInputTrack->Graph();
MOZ_DIAGNOSTIC_ASSERT(graph,
"A destroyed input track is only expected when "
"cloning, but since we're live there must be another "
"live track that is keeping the graph alive");
mTrack = graph->CreateForwardedInputTrack(mInputTrack->mType);
mPort = mTrack->AllocateInputPort(mInputTrack);
mMTGListener = new MTGListener(this);
AddListener(mMTGListener);
}
nsresult rv;
nsCOMPtr<nsIUUIDGenerator> uuidgen =
do_GetService("@mozilla.org/uuid-generator;1", &rv);
nsID uuid;
memset(&uuid, 0, sizeof(uuid));
if (uuidgen) {
uuidgen->GenerateUUIDInPlace(&uuid);
}
char chars[NSID_LENGTH];
uuid.ToProvidedString(chars);
mID = NS_ConvertASCIItoUTF16(chars);
}
MediaStreamTrack::~MediaStreamTrack() { Destroy(); }
void MediaStreamTrack::Destroy() {
SetReadyState(MediaStreamTrackState::Ended);
// Remove all listeners -- avoid iterating over the list we're removing from
for (const auto& listener : mTrackListeners.Clone()) {
RemoveListener(listener);
}
// Do the same as above for direct listeners
for (const auto& listener : mDirectTrackListeners.Clone()) {
RemoveDirectListener(listener);
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(MediaStreamTrack)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(MediaStreamTrack,
DOMEventTargetHelper)
tmp->Destroy();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mWindow)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSource)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPrincipal)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPendingPrincipal)
NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_PTR
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MediaStreamTrack,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mWindow)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSource)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrincipal)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPendingPrincipal)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_ADDREF_INHERITED(MediaStreamTrack, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(MediaStreamTrack, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaStreamTrack)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
JSObject* MediaStreamTrack::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MediaStreamTrack_Binding::Wrap(aCx, this, aGivenProto);
}
void MediaStreamTrack::GetId(nsAString& aID) const { aID = mID; }
void MediaStreamTrack::SetEnabled(bool aEnabled) {
LOG(LogLevel::Info,
("MediaStreamTrack %p %s", this, aEnabled ? "Enabled" : "Disabled"));
if (mEnabled == aEnabled) {
return;
}
mEnabled = aEnabled;
if (Ended()) {
return;
}
mTrack->SetDisabledTrackMode(mEnabled ? DisabledTrackMode::ENABLED
: DisabledTrackMode::SILENCE_BLACK);
NotifyEnabledChanged();
}
void MediaStreamTrack::Stop() {
LOG(LogLevel::Info, ("MediaStreamTrack %p Stop()", this));
if (Ended()) {
LOG(LogLevel::Warning, ("MediaStreamTrack %p Already ended", this));
return;
}
SetReadyState(MediaStreamTrackState::Ended);
NotifyEnded();
}
void MediaStreamTrack::GetConstraints(dom::MediaTrackConstraints& aResult) {
aResult = mConstraints;
}
void MediaStreamTrack::GetSettings(dom::MediaTrackSettings& aResult,
CallerType aCallerType) {
GetSource().GetSettings(aResult);
// Spoof values when privacy.resistFingerprinting is true.
if (!nsContentUtils::ResistFingerprinting(aCallerType)) {
return;
}
if (aResult.mFacingMode.WasPassed()) {
aResult.mFacingMode.Value().AssignASCII(
VideoFacingModeEnumValues::GetString(VideoFacingModeEnum::User));
}
}
already_AddRefed<Promise> MediaStreamTrack::ApplyConstraints(
const MediaTrackConstraints& aConstraints, CallerType aCallerType,
ErrorResult& aRv) {
if (MOZ_LOG_TEST(gMediaStreamTrackLog, LogLevel::Info)) {
nsString str;
aConstraints.ToJSON(str);
LOG(LogLevel::Info, ("MediaStreamTrack %p ApplyConstraints() with "
"constraints %s",
this, NS_ConvertUTF16toUTF8(str).get()));
}
nsIGlobalObject* go = mWindow ? mWindow->AsGlobal() : nullptr;
RefPtr<Promise> promise = Promise::Create(go, aRv);
if (aRv.Failed()) {
return nullptr;
}
// Forward constraints to the source.
//
// After GetSource().ApplyConstraints succeeds (after it's been to
// media-thread and back), and no sooner, do we set mConstraints to the newly
// applied values.
// Keep a reference to this, to make sure it's still here when we get back.
RefPtr<MediaStreamTrack> self(this);
GetSource()
.ApplyConstraints(aConstraints, aCallerType)
->Then(
GetCurrentSerialEventTarget(), __func__,
[this, self, promise, aConstraints](bool aDummy) {
if (!mWindow || !mWindow->IsCurrentInnerWindow()) {
return; // Leave Promise pending after navigation by design.
}
mConstraints = aConstraints;
promise->MaybeResolve(false);
},
[this, self, promise](const RefPtr<MediaMgrError>& aError) {
if (!mWindow || !mWindow->IsCurrentInnerWindow()) {
return; // Leave Promise pending after navigation by design.
}
promise->MaybeReject(
MakeRefPtr<MediaStreamError>(mWindow, *aError));
});
return promise.forget();
}
ProcessedMediaTrack* MediaStreamTrack::GetTrack() const {
MOZ_DIAGNOSTIC_ASSERT(!Ended());
return mTrack;
}
MediaTrackGraph* MediaStreamTrack::Graph() const {
MOZ_DIAGNOSTIC_ASSERT(!Ended());
return mTrack->Graph();
}
MediaTrackGraphImpl* MediaStreamTrack::GraphImpl() const {
MOZ_DIAGNOSTIC_ASSERT(!Ended());
return mTrack->GraphImpl();
}
void MediaStreamTrack::SetPrincipal(nsIPrincipal* aPrincipal) {
if (aPrincipal == mPrincipal) {
return;
}
mPrincipal = aPrincipal;
LOG(LogLevel::Info,
("MediaStreamTrack %p principal changed to %p. Now: "
"null=%d, codebase=%d, expanded=%d, system=%d",
this, mPrincipal.get(), mPrincipal->GetIsNullPrincipal(),
mPrincipal->GetIsContentPrincipal(),
mPrincipal->GetIsExpandedPrincipal(), mPrincipal->IsSystemPrincipal()));
for (PrincipalChangeObserver<MediaStreamTrack>* observer :
mPrincipalChangeObservers) {
observer->PrincipalChanged(this);
}
}
void MediaStreamTrack::PrincipalChanged() {
mPendingPrincipal = GetSource().GetPrincipal();
nsCOMPtr<nsIPrincipal> newPrincipal = mPrincipal;
LOG(LogLevel::Info, ("MediaStreamTrack %p Principal changed on main thread "
"to %p (pending). Combining with existing principal %p.",
this, mPendingPrincipal.get(), mPrincipal.get()));
if (nsContentUtils::CombineResourcePrincipals(&newPrincipal,
mPendingPrincipal)) {
SetPrincipal(newPrincipal);
}
}
void MediaStreamTrack::NotifyPrincipalHandleChanged(
const PrincipalHandle& aNewPrincipalHandle) {
PrincipalHandle handle(aNewPrincipalHandle);
LOG(LogLevel::Info, ("MediaStreamTrack %p principalHandle changed on "
"MediaTrackGraph thread to %p. Current principal: %p, "
"pending: %p",
this, GetPrincipalFromHandle(handle), mPrincipal.get(),
mPendingPrincipal.get()));
if (PrincipalHandleMatches(handle, mPendingPrincipal)) {
SetPrincipal(mPendingPrincipal);
mPendingPrincipal = nullptr;
}
}
void MediaStreamTrack::MutedChanged(bool aNewState) {
MOZ_ASSERT(NS_IsMainThread());
/**
* 4.3.1 Life-cycle and Media flow - Media flow
* To set a track's muted state to newState, the User Agent MUST run the
* following steps:
* 1. Let track be the MediaStreamTrack in question.
* 2. Set track's muted attribute to newState.
* 3. If newState is true let eventName be mute, otherwise unmute.
* 4. Fire a simple event named eventName on track.
*/
if (mMuted == aNewState) {
return;
}
LOG(LogLevel::Info,
("MediaStreamTrack %p became %s", this, aNewState ? "muted" : "unmuted"));
mMuted = aNewState;
if (Ended()) {
return;
}
nsString eventName = aNewState ? u"mute"_ns : u"unmute"_ns;
DispatchTrustedEvent(eventName);
}
void MediaStreamTrack::NotifyEnded() {
MOZ_ASSERT(mReadyState == MediaStreamTrackState::Ended);
for (const auto& consumer : mConsumers.Clone()) {
if (consumer) {
consumer->NotifyEnded(this);
} else {
MOZ_ASSERT_UNREACHABLE("A consumer was not explicitly removed");
mConsumers.RemoveElement(consumer);
}
}
}
void MediaStreamTrack::NotifyEnabledChanged() {
GetSource().SinkEnabledStateChanged();
for (const auto& consumer : mConsumers.Clone()) {
if (consumer) {
consumer->NotifyEnabledChanged(this, Enabled());
} else {
MOZ_ASSERT_UNREACHABLE("A consumer was not explicitly removed");
mConsumers.RemoveElement(consumer);
}
}
}
bool MediaStreamTrack::AddPrincipalChangeObserver(
PrincipalChangeObserver<MediaStreamTrack>* aObserver) {
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier.
mPrincipalChangeObservers.AppendElement(aObserver);
return true;
}
bool MediaStreamTrack::RemovePrincipalChangeObserver(
PrincipalChangeObserver<MediaStreamTrack>* aObserver) {
return mPrincipalChangeObservers.RemoveElement(aObserver);
}
void MediaStreamTrack::AddConsumer(MediaStreamTrackConsumer* aConsumer) {
MOZ_ASSERT(!mConsumers.Contains(aConsumer));
mConsumers.AppendElement(aConsumer);
// Remove destroyed consumers for cleanliness
while (mConsumers.RemoveElement(nullptr)) {
MOZ_ASSERT_UNREACHABLE("A consumer was not explicitly removed");
}
}
void MediaStreamTrack::RemoveConsumer(MediaStreamTrackConsumer* aConsumer) {
mConsumers.RemoveElement(aConsumer);
// Remove destroyed consumers for cleanliness
while (mConsumers.RemoveElement(nullptr)) {
MOZ_ASSERT_UNREACHABLE("A consumer was not explicitly removed");
}
}
already_AddRefed<MediaStreamTrack> MediaStreamTrack::Clone() {
RefPtr<MediaStreamTrack> newTrack = CloneInternal();
newTrack->SetEnabled(Enabled());
newTrack->SetMuted(Muted());
return newTrack.forget();
}
void MediaStreamTrack::SetReadyState(MediaStreamTrackState aState) {
MOZ_ASSERT(!(mReadyState == MediaStreamTrackState::Ended &&
aState == MediaStreamTrackState::Live),
"We don't support overriding the ready state from ended to live");
if (Ended()) {
return;
}
if (mReadyState == MediaStreamTrackState::Live &&
aState == MediaStreamTrackState::Ended) {
if (mSource) {
mSource->UnregisterSink(mSink.get());
}
if (mMTGListener) {
RemoveListener(mMTGListener);
}
if (mPort) {
mPort->Destroy();
}
if (mTrack) {
mTrack->Destroy();
}
mPort = nullptr;
mTrack = nullptr;
mMTGListener = nullptr;
}
mReadyState = aState;
}
void MediaStreamTrack::OverrideEnded() {
MOZ_ASSERT(NS_IsMainThread());
if (Ended()) {
return;
}
LOG(LogLevel::Info, ("MediaStreamTrack %p ended", this));
SetReadyState(MediaStreamTrackState::Ended);
NotifyEnded();
DispatchTrustedEvent(u"ended"_ns);
}
void MediaStreamTrack::AddListener(MediaTrackListener* aListener) {
LOG(LogLevel::Debug,
("MediaStreamTrack %p adding listener %p", this, aListener));
mTrackListeners.AppendElement(aListener);
if (Ended()) {
return;
}
mTrack->AddListener(aListener);
}
void MediaStreamTrack::RemoveListener(MediaTrackListener* aListener) {
LOG(LogLevel::Debug,
("MediaStreamTrack %p removing listener %p", this, aListener));
mTrackListeners.RemoveElement(aListener);
if (Ended()) {
return;
}
mTrack->RemoveListener(aListener);
}
void MediaStreamTrack::AddDirectListener(DirectMediaTrackListener* aListener) {
LOG(LogLevel::Debug, ("MediaStreamTrack %p (%s) adding direct listener %p to "
"track %p",
this, AsAudioStreamTrack() ? "audio" : "video",
aListener, mTrack.get()));
mDirectTrackListeners.AppendElement(aListener);
if (Ended()) {
return;
}
mTrack->AddDirectListener(aListener);
}
void MediaStreamTrack::RemoveDirectListener(
DirectMediaTrackListener* aListener) {
LOG(LogLevel::Debug,
("MediaStreamTrack %p removing direct listener %p from track %p", this,
aListener, mTrack.get()));
mDirectTrackListeners.RemoveElement(aListener);
if (Ended()) {
return;
}
mTrack->RemoveDirectListener(aListener);
}
already_AddRefed<MediaInputPort> MediaStreamTrack::ForwardTrackContentsTo(
ProcessedMediaTrack* aTrack) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_RELEASE_ASSERT(aTrack);
return aTrack->AllocateInputPort(mTrack);
}
} // namespace dom
} // namespace mozilla