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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 "nsISupportsPrimitives.h"
#include "nsSpeechTask.h"
#include "mozilla/Logging.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/SpeechSynthesisBinding.h"
#include "SpeechSynthesis.h"
#include "nsContentUtils.h"
#include "nsSynthVoiceRegistry.h"
#include "mozilla/dom/Document.h"
#include "nsIDocShell.h"
#undef LOG
mozilla::LogModule* GetSpeechSynthLog() {
static mozilla::LazyLogModule sLog("SpeechSynthesis");
return sLog;
}
#define LOG(type, msg) MOZ_LOG(GetSpeechSynthLog(), type, msg)
namespace mozilla::dom {
NS_IMPL_CYCLE_COLLECTION_CLASS(SpeechSynthesis)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SpeechSynthesis,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mCurrentTask)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSpeechQueue)
tmp->mVoiceCache.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_REFERENCE
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SpeechSynthesis,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCurrentTask)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSpeechQueue)
for (auto iter = tmp->mVoiceCache.Iter(); !iter.Done(); iter.Next()) {
SpeechSynthesisVoice* voice = iter.UserData();
cb.NoteXPCOMChild(voice);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(SpeechSynthesis)
NS_INTERFACE_MAP_ENTRY(nsIObserver)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(SpeechSynthesis, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(SpeechSynthesis, DOMEventTargetHelper)
SpeechSynthesis::SpeechSynthesis(nsPIDOMWindowInner* aParent)
: DOMEventTargetHelper(aParent),
mHoldQueue(false),
mInnerID(aParent->WindowID()) {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (obs) {
obs->AddObserver(this, "inner-window-destroyed", true);
obs->AddObserver(this, "synth-voices-changed", true);
}
}
SpeechSynthesis::~SpeechSynthesis() = default;
JSObject* SpeechSynthesis::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return SpeechSynthesis_Binding::Wrap(aCx, this, aGivenProto);
}
bool SpeechSynthesis::Pending() const {
// If we don't have any task, nothing is pending. If we have only one task,
// check if that task is currently pending. If we have more than one task,
// then the tasks after the first one are definitely pending.
return mSpeechQueue.Length() > 1 ||
(mSpeechQueue.Length() == 1 &&
(!mCurrentTask || mCurrentTask->IsPending()));
}
bool SpeechSynthesis::Speaking() const {
// Check global speaking state if there is no active speaking task.
return (!mSpeechQueue.IsEmpty() && HasSpeakingTask()) ||
nsSynthVoiceRegistry::GetInstance()->IsSpeaking();
}
bool SpeechSynthesis::Paused() const {
return mHoldQueue || (mCurrentTask && mCurrentTask->IsPrePaused()) ||
(!mSpeechQueue.IsEmpty() && mSpeechQueue.ElementAt(0)->IsPaused());
}
bool SpeechSynthesis::HasEmptyQueue() const {
return mSpeechQueue.Length() == 0;
}
bool SpeechSynthesis::HasVoices() const {
uint32_t voiceCount = mVoiceCache.Count();
if (voiceCount == 0) {
nsresult rv =
nsSynthVoiceRegistry::GetInstance()->GetVoiceCount(&voiceCount);
if (NS_WARN_IF(NS_FAILED(rv))) {
return false;
}
}
return voiceCount != 0;
}
void SpeechSynthesis::Speak(SpeechSynthesisUtterance& aUtterance) {
if (!mInnerID) {
return;
}
mSpeechQueue.AppendElement(&aUtterance);
// If we only have one item in the queue, we aren't pre-paused, and
// we have voices available, speak it.
if (mSpeechQueue.Length() == 1 && !mCurrentTask && !mHoldQueue &&
HasVoices()) {
AdvanceQueue();
}
}
void SpeechSynthesis::AdvanceQueue() {
LOG(LogLevel::Debug,
("SpeechSynthesis::AdvanceQueue length=%zu", mSpeechQueue.Length()));
if (mSpeechQueue.IsEmpty()) {
return;
}
RefPtr<SpeechSynthesisUtterance> utterance = mSpeechQueue.ElementAt(0);
nsAutoString docLang;
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
Document* doc = window ? window->GetExtantDoc() : nullptr;
if (doc) {
Element* elm = doc->GetHtmlElement();
if (elm) {
elm->GetLang(docLang);
}
}
mCurrentTask =
nsSynthVoiceRegistry::GetInstance()->SpeakUtterance(*utterance, docLang);
if (mCurrentTask) {
mCurrentTask->SetSpeechSynthesis(this);
}
}
void SpeechSynthesis::Cancel() {
if (!mSpeechQueue.IsEmpty() && HasSpeakingTask()) {
// Remove all queued utterances except for current one, we will remove it
// in OnEnd
mSpeechQueue.RemoveLastElements(mSpeechQueue.Length() - 1);
} else {
mSpeechQueue.Clear();
}
if (mCurrentTask) {
mCurrentTask->Cancel();
}
}
void SpeechSynthesis::Pause() {
if (Paused()) {
return;
}
if (!mSpeechQueue.IsEmpty() && HasSpeakingTask()) {
mCurrentTask->Pause();
} else {
mHoldQueue = true;
}
}
void SpeechSynthesis::Resume() {
if (!Paused()) {
return;
}
mHoldQueue = false;
if (mCurrentTask) {
mCurrentTask->Resume();
} else {
AdvanceQueue();
}
}
void SpeechSynthesis::OnEnd(const nsSpeechTask* aTask) {
MOZ_ASSERT(mCurrentTask == aTask);
if (!mSpeechQueue.IsEmpty()) {
mSpeechQueue.RemoveElementAt(0);
}
mCurrentTask = nullptr;
AdvanceQueue();
}
void SpeechSynthesis::GetVoices(
nsTArray<RefPtr<SpeechSynthesisVoice> >& aResult) {
aResult.Clear();
uint32_t voiceCount = 0;
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
nsCOMPtr<nsIDocShell> docShell = window ? window->GetDocShell() : nullptr;
if (nsContentUtils::ShouldResistFingerprinting(docShell)) {
return;
}
nsresult rv = nsSynthVoiceRegistry::GetInstance()->GetVoiceCount(&voiceCount);
if (NS_WARN_IF(NS_FAILED(rv))) {
return;
}
nsISupports* voiceParent = NS_ISUPPORTS_CAST(nsIObserver*, this);
for (uint32_t i = 0; i < voiceCount; i++) {
nsAutoString uri;
rv = nsSynthVoiceRegistry::GetInstance()->GetVoice(i, uri);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to retrieve voice from registry");
continue;
}
SpeechSynthesisVoice* voice = mVoiceCache.GetWeak(uri);
if (!voice) {
voice = new SpeechSynthesisVoice(voiceParent, uri);
}
aResult.AppendElement(voice);
}
mVoiceCache.Clear();
for (uint32_t i = 0; i < aResult.Length(); i++) {
SpeechSynthesisVoice* voice = aResult[i];
mVoiceCache.InsertOrUpdate(voice->mUri, RefPtr{voice});
}
}
// For testing purposes, allows us to cancel the current task that is
// misbehaving, and flush the queue.
void SpeechSynthesis::ForceEnd() {
if (mCurrentTask) {
mCurrentTask->ForceEnd();
}
}
NS_IMETHODIMP
SpeechSynthesis::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData) {
MOZ_ASSERT(NS_IsMainThread());
if (strcmp(aTopic, "inner-window-destroyed") == 0) {
nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
uint64_t innerID;
nsresult rv = wrapper->GetData(&innerID);
NS_ENSURE_SUCCESS(rv, rv);
if (innerID == mInnerID) {
mInnerID = 0;
Cancel();
nsCOMPtr<nsIObserverService> obs =
mozilla::services::GetObserverService();
if (obs) {
obs->RemoveObserver(this, "inner-window-destroyed");
}
}
} else if (strcmp(aTopic, "synth-voices-changed") == 0) {
LOG(LogLevel::Debug, ("SpeechSynthesis::onvoiceschanged"));
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
nsCOMPtr<nsIDocShell> docShell = window ? window->GetDocShell() : nullptr;
if (!nsContentUtils::ShouldResistFingerprinting(docShell)) {
DispatchTrustedEvent(u"voiceschanged"_ns);
// If we have a pending item, and voices become available, speak it.
if (!mCurrentTask && !mHoldQueue && HasVoices()) {
AdvanceQueue();
}
}
}
return NS_OK;
}
} // namespace mozilla::dom