1 files changed, 765 insertions, 0 deletions
diff --git a/dom/media/webspeech/synth/nsSynthVoiceRegistry.cpp b/dom/media/webspeech/synth/nsSynthVoiceRegistry.cpp
new file mode 100644
index 0000000000..e2b3a57da5
--- /dev/null
+++ b/dom/media/webspeech/synth/nsSynthVoiceRegistry.cpp
@@ -0,0 +1,765 @@
+/* -*- 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 "nsISpeechService.h"
+#include "nsServiceManagerUtils.h"
+#include "nsCategoryManagerUtils.h"
+
+#include "SpeechSynthesisUtterance.h"
+#include "SpeechSynthesisVoice.h"
+#include "nsContentUtils.h"
+#include "nsSynthVoiceRegistry.h"
+#include "nsSpeechTask.h"
+#include "AudioChannelService.h"
+
+#include "nsString.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/intl/LocaleService.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/Unused.h"
+
+#include "SpeechSynthesisChild.h"
+#include "SpeechSynthesisParent.h"
+
+using mozilla::intl::LocaleService;
+
+#undef LOG
+extern mozilla::LogModule* GetSpeechSynthLog();
+#define LOG(type, msg) MOZ_LOG(GetSpeechSynthLog(), type, msg)
+
+namespace {
+
+void GetAllSpeechSynthActors(
+    nsTArray<mozilla::dom::SpeechSynthesisParent*>& aActors) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(aActors.IsEmpty());
+
+  AutoTArray<mozilla::dom::ContentParent*, 20> contentActors;
+  mozilla::dom::ContentParent::GetAll(contentActors);
+
+  for (uint32_t contentIndex = 0; contentIndex < contentActors.Length();
+       ++contentIndex) {
+    MOZ_ASSERT(contentActors[contentIndex]);
+
+    AutoTArray<mozilla::dom::PSpeechSynthesisParent*, 5> speechsynthActors;
+    contentActors[contentIndex]->ManagedPSpeechSynthesisParent(
+        speechsynthActors);
+
+    for (uint32_t speechsynthIndex = 0;
+         speechsynthIndex < speechsynthActors.Length(); ++speechsynthIndex) {
+      MOZ_ASSERT(speechsynthActors[speechsynthIndex]);
+
+      mozilla::dom::SpeechSynthesisParent* actor =
+          static_cast<mozilla::dom::SpeechSynthesisParent*>(
+              speechsynthActors[speechsynthIndex]);
+      aActors.AppendElement(actor);
+    }
+  }
+}
+
+}  // namespace
+
+namespace mozilla::dom {
+
+// VoiceData
+
+class VoiceData final {
+ private:
+  // Private destructor, to discourage deletion outside of Release():
+  ~VoiceData() = default;
+
+ public:
+  VoiceData(nsISpeechService* aService, const nsAString& aUri,
+            const nsAString& aName, const nsAString& aLang, bool aIsLocal,
+            bool aQueuesUtterances)
+      : mService(aService),
+        mUri(aUri),
+        mName(aName),
+        mLang(aLang),
+        mIsLocal(aIsLocal),
+        mIsQueued(aQueuesUtterances) {}
+
+  NS_INLINE_DECL_REFCOUNTING(VoiceData)
+
+  nsCOMPtr<nsISpeechService> mService;
+
+  nsString mUri;
+
+  nsString mName;
+
+  nsString mLang;
+
+  bool mIsLocal;
+
+  bool mIsQueued;
+};
+
+// GlobalQueueItem
+
+class GlobalQueueItem final {
+ private:
+  // Private destructor, to discourage deletion outside of Release():
+  ~GlobalQueueItem() = default;
+
+ public:
+  GlobalQueueItem(VoiceData* aVoice, nsSpeechTask* aTask,
+                  const nsAString& aText, const float& aVolume,
+                  const float& aRate, const float& aPitch)
+      : mVoice(aVoice),
+        mTask(aTask),
+        mText(aText),
+        mVolume(aVolume),
+        mRate(aRate),
+        mPitch(aPitch),
+        mIsLocal(false) {}
+
+  NS_INLINE_DECL_REFCOUNTING(GlobalQueueItem)
+
+  RefPtr<VoiceData> mVoice;
+
+  RefPtr<nsSpeechTask> mTask;
+
+  nsString mText;
+
+  float mVolume;
+
+  float mRate;
+
+  float mPitch;
+
+  bool mIsLocal;
+};
+
+// nsSynthVoiceRegistry
+
+static StaticRefPtr<nsSynthVoiceRegistry> gSynthVoiceRegistry;
+
+NS_IMPL_ISUPPORTS(nsSynthVoiceRegistry, nsISynthVoiceRegistry)
+
+nsSynthVoiceRegistry::nsSynthVoiceRegistry()
+    : mSpeechSynthChild(nullptr), mUseGlobalQueue(false), mIsSpeaking(false) {
+  if (XRE_IsContentProcess()) {
+    mSpeechSynthChild = new SpeechSynthesisChild();
+    ContentChild::GetSingleton()->SendPSpeechSynthesisConstructor(
+        mSpeechSynthChild);
+  }
+}
+
+nsSynthVoiceRegistry::~nsSynthVoiceRegistry() {
+  LOG(LogLevel::Debug, ("~nsSynthVoiceRegistry"));
+
+  // mSpeechSynthChild's lifecycle is managed by the Content protocol.
+  mSpeechSynthChild = nullptr;
+
+  mUriVoiceMap.Clear();
+}
+
+nsSynthVoiceRegistry* nsSynthVoiceRegistry::GetInstance() {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  if (!gSynthVoiceRegistry) {
+    gSynthVoiceRegistry = new nsSynthVoiceRegistry();
+    ClearOnShutdown(&gSynthVoiceRegistry);
+    if (XRE_IsParentProcess()) {
+      // Start up all speech synth services.
+      NS_CreateServicesFromCategory(NS_SPEECH_SYNTH_STARTED, nullptr,
+                                    NS_SPEECH_SYNTH_STARTED);
+    }
+  }
+
+  return gSynthVoiceRegistry;
+}
+
+already_AddRefed<nsSynthVoiceRegistry>
+nsSynthVoiceRegistry::GetInstanceForService() {
+  RefPtr<nsSynthVoiceRegistry> registry = GetInstance();
+
+  return registry.forget();
+}
+
+bool nsSynthVoiceRegistry::SendInitialVoicesAndState(
+    SpeechSynthesisParent* aParent) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  nsTArray<RemoteVoice> voices;
+  nsTArray<nsString> defaults;
+
+  for (uint32_t i = 0; i < mVoices.Length(); ++i) {
+    RefPtr<VoiceData> voice = mVoices[i];
+
+    voices.AppendElement(RemoteVoice(voice->mUri, voice->mName, voice->mLang,
+                                     voice->mIsLocal, voice->mIsQueued));
+  }
+
+  for (uint32_t i = 0; i < mDefaultVoices.Length(); ++i) {
+    defaults.AppendElement(mDefaultVoices[i]->mUri);
+  }
+
+  return aParent->SendInitialVoicesAndState(voices, defaults, IsSpeaking());
+}
+
+void nsSynthVoiceRegistry::RecvInitialVoicesAndState(
+    const nsTArray<RemoteVoice>& aVoices, const nsTArray<nsString>& aDefaults,
+    const bool& aIsSpeaking) {
+  // We really should have a local instance since this is a directed response to
+  // an Init() call.
+  MOZ_ASSERT(gSynthVoiceRegistry);
+
+  for (uint32_t i = 0; i < aVoices.Length(); ++i) {
+    RemoteVoice voice = aVoices[i];
+    gSynthVoiceRegistry->AddVoiceImpl(nullptr, voice.voiceURI(), voice.name(),
+                                      voice.lang(), voice.localService(),
+                                      voice.queued());
+  }
+
+  for (uint32_t i = 0; i < aDefaults.Length(); ++i) {
+    gSynthVoiceRegistry->SetDefaultVoice(aDefaults[i], true);
+  }
+
+  gSynthVoiceRegistry->mIsSpeaking = aIsSpeaking;
+
+  if (aVoices.Length()) {
+    gSynthVoiceRegistry->NotifyVoicesChanged();
+  }
+}
+
+void nsSynthVoiceRegistry::RecvRemoveVoice(const nsAString& aUri) {
+  // If we dont have a local instance of the registry yet, we will recieve
+  // current voices at contruction time.
+  if (!gSynthVoiceRegistry) {
+    return;
+  }
+
+  gSynthVoiceRegistry->RemoveVoice(nullptr, aUri);
+}
+
+void nsSynthVoiceRegistry::RecvAddVoice(const RemoteVoice& aVoice) {
+  // If we dont have a local instance of the registry yet, we will recieve
+  // current voices at contruction time.
+  if (!gSynthVoiceRegistry) {
+    return;
+  }
+
+  gSynthVoiceRegistry->AddVoiceImpl(nullptr, aVoice.voiceURI(), aVoice.name(),
+                                    aVoice.lang(), aVoice.localService(),
+                                    aVoice.queued());
+}
+
+void nsSynthVoiceRegistry::RecvSetDefaultVoice(const nsAString& aUri,
+                                               bool aIsDefault) {
+  // If we dont have a local instance of the registry yet, we will recieve
+  // current voices at contruction time.
+  if (!gSynthVoiceRegistry) {
+    return;
+  }
+
+  gSynthVoiceRegistry->SetDefaultVoice(aUri, aIsDefault);
+}
+
+void nsSynthVoiceRegistry::RecvIsSpeakingChanged(bool aIsSpeaking) {
+  // If we dont have a local instance of the registry yet, we will get the
+  // speaking state on construction.
+  if (!gSynthVoiceRegistry) {
+    return;
+  }
+
+  gSynthVoiceRegistry->mIsSpeaking = aIsSpeaking;
+}
+
+void nsSynthVoiceRegistry::RecvNotifyVoicesChanged() {
+  // If we dont have a local instance of the registry yet, we don't care.
+  if (!gSynthVoiceRegistry) {
+    return;
+  }
+
+  gSynthVoiceRegistry->NotifyVoicesChanged();
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::AddVoice(nsISpeechService* aService,
+                               const nsAString& aUri, const nsAString& aName,
+                               const nsAString& aLang, bool aLocalService,
+                               bool aQueuesUtterances) {
+  LOG(LogLevel::Debug,
+      ("nsSynthVoiceRegistry::AddVoice uri='%s' name='%s' lang='%s' local=%s "
+       "queued=%s",
+       NS_ConvertUTF16toUTF8(aUri).get(), NS_ConvertUTF16toUTF8(aName).get(),
+       NS_ConvertUTF16toUTF8(aLang).get(), aLocalService ? "true" : "false",
+       aQueuesUtterances ? "true" : "false"));
+
+  if (NS_WARN_IF(XRE_IsContentProcess())) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  return AddVoiceImpl(aService, aUri, aName, aLang, aLocalService,
+                      aQueuesUtterances);
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::RemoveVoice(nsISpeechService* aService,
+                                  const nsAString& aUri) {
+  LOG(LogLevel::Debug, ("nsSynthVoiceRegistry::RemoveVoice uri='%s' (%s)",
+                        NS_ConvertUTF16toUTF8(aUri).get(),
+                        (XRE_IsContentProcess()) ? "child" : "parent"));
+
+  bool found = false;
+  VoiceData* retval = mUriVoiceMap.GetWeak(aUri, &found);
+
+  if (NS_WARN_IF(!(found))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  if (NS_WARN_IF(!(aService == retval->mService))) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  mVoices.RemoveElement(retval);
+  mDefaultVoices.RemoveElement(retval);
+  mUriVoiceMap.Remove(aUri);
+
+  if (retval->mIsQueued &&
+      !StaticPrefs::media_webspeech_synth_force_global_queue()) {
+    // Check if this is the last queued voice, and disable the global queue if
+    // it is.
+    bool queued = false;
+    for (uint32_t i = 0; i < mVoices.Length(); i++) {
+      VoiceData* voice = mVoices[i];
+      if (voice->mIsQueued) {
+        queued = true;
+        break;
+      }
+    }
+    if (!queued) {
+      mUseGlobalQueue = false;
+    }
+  }
+
+  nsTArray<SpeechSynthesisParent*> ssplist;
+  GetAllSpeechSynthActors(ssplist);
+
+  for (uint32_t i = 0; i < ssplist.Length(); ++i)
+    Unused << ssplist[i]->SendVoiceRemoved(aUri);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::NotifyVoicesChanged() {
+  if (XRE_IsParentProcess()) {
+    nsTArray<SpeechSynthesisParent*> ssplist;
+    GetAllSpeechSynthActors(ssplist);
+
+    for (uint32_t i = 0; i < ssplist.Length(); ++i)
+      Unused << ssplist[i]->SendNotifyVoicesChanged();
+  }
+
+  nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
+  if (NS_WARN_IF(!(obs))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  obs->NotifyObservers(nullptr, "synth-voices-changed", nullptr);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::SetDefaultVoice(const nsAString& aUri, bool aIsDefault) {
+  bool found = false;
+  VoiceData* retval = mUriVoiceMap.GetWeak(aUri, &found);
+  if (NS_WARN_IF(!(found))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  mDefaultVoices.RemoveElement(retval);
+
+  LOG(LogLevel::Debug,
+      ("nsSynthVoiceRegistry::SetDefaultVoice %s %s",
+       NS_ConvertUTF16toUTF8(aUri).get(), aIsDefault ? "true" : "false"));
+
+  if (aIsDefault) {
+    mDefaultVoices.AppendElement(retval);
+  }
+
+  if (XRE_IsParentProcess()) {
+    nsTArray<SpeechSynthesisParent*> ssplist;
+    GetAllSpeechSynthActors(ssplist);
+
+    for (uint32_t i = 0; i < ssplist.Length(); ++i) {
+      Unused << ssplist[i]->SendSetDefaultVoice(aUri, aIsDefault);
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::GetVoiceCount(uint32_t* aRetval) {
+  *aRetval = mVoices.Length();
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::GetVoice(uint32_t aIndex, nsAString& aRetval) {
+  if (NS_WARN_IF(!(aIndex < mVoices.Length()))) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  aRetval = mVoices[aIndex]->mUri;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::IsDefaultVoice(const nsAString& aUri, bool* aRetval) {
+  bool found;
+  VoiceData* voice = mUriVoiceMap.GetWeak(aUri, &found);
+  if (NS_WARN_IF(!(found))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  for (int32_t i = mDefaultVoices.Length(); i > 0;) {
+    VoiceData* defaultVoice = mDefaultVoices[--i];
+
+    if (voice->mLang.Equals(defaultVoice->mLang)) {
+      *aRetval = voice == defaultVoice;
+      return NS_OK;
+    }
+  }
+
+  *aRetval = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::IsLocalVoice(const nsAString& aUri, bool* aRetval) {
+  bool found;
+  VoiceData* voice = mUriVoiceMap.GetWeak(aUri, &found);
+  if (NS_WARN_IF(!(found))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  *aRetval = voice->mIsLocal;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::GetVoiceLang(const nsAString& aUri, nsAString& aRetval) {
+  bool found;
+  VoiceData* voice = mUriVoiceMap.GetWeak(aUri, &found);
+  if (NS_WARN_IF(!(found))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  aRetval = voice->mLang;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsSynthVoiceRegistry::GetVoiceName(const nsAString& aUri, nsAString& aRetval) {
+  bool found;
+  VoiceData* voice = mUriVoiceMap.GetWeak(aUri, &found);
+  if (NS_WARN_IF(!(found))) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  aRetval = voice->mName;
+  return NS_OK;
+}
+
+nsresult nsSynthVoiceRegistry::AddVoiceImpl(
+    nsISpeechService* aService, const nsAString& aUri, const nsAString& aName,
+    const nsAString& aLang, bool aLocalService, bool aQueuesUtterances) {
+  const bool found = mUriVoiceMap.Contains(aUri);
+  if (NS_WARN_IF(found)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  RefPtr<VoiceData> voice = new VoiceData(aService, aUri, aName, aLang,
+                                          aLocalService, aQueuesUtterances);
+
+  mVoices.AppendElement(voice);
+  mUriVoiceMap.InsertOrUpdate(aUri, std::move(voice));
+  mUseGlobalQueue |= aQueuesUtterances;
+
+  nsTArray<SpeechSynthesisParent*> ssplist;
+  GetAllSpeechSynthActors(ssplist);
+
+  if (!ssplist.IsEmpty()) {
+    mozilla::dom::RemoteVoice ssvoice(nsString(aUri), nsString(aName),
+                                      nsString(aLang), aLocalService,
+                                      aQueuesUtterances);
+
+    for (uint32_t i = 0; i < ssplist.Length(); ++i) {
+      Unused << ssplist[i]->SendVoiceAdded(ssvoice);
+    }
+  }
+
+  return NS_OK;
+}
+
+bool nsSynthVoiceRegistry::FindVoiceByLang(const nsAString& aLang,
+                                           VoiceData** aRetval) {
+  nsAString::const_iterator dashPos, start, end;
+  aLang.BeginReading(start);
+  aLang.EndReading(end);
+
+  while (true) {
+    nsAutoString langPrefix(Substring(start, end));
+
+    for (int32_t i = mDefaultVoices.Length(); i > 0;) {
+      VoiceData* voice = mDefaultVoices[--i];
+
+      if (StringBeginsWith(voice->mLang, langPrefix)) {
+        *aRetval = voice;
+        return true;
+      }
+    }
+
+    for (int32_t i = mVoices.Length(); i > 0;) {
+      VoiceData* voice = mVoices[--i];
+
+      if (StringBeginsWith(voice->mLang, langPrefix)) {
+        *aRetval = voice;
+        return true;
+      }
+    }
+
+    dashPos = end;
+    end = start;
+
+    if (!RFindInReadable(u"-"_ns, end, dashPos)) {
+      break;
+    }
+  }
+
+  return false;
+}
+
+VoiceData* nsSynthVoiceRegistry::FindBestMatch(const nsAString& aUri,
+                                               const nsAString& aLang) {
+  if (mVoices.IsEmpty()) {
+    return nullptr;
+  }
+
+  bool found = false;
+  VoiceData* retval = mUriVoiceMap.GetWeak(aUri, &found);
+
+  if (found) {
+    LOG(LogLevel::Debug, ("nsSynthVoiceRegistry::FindBestMatch - Matched URI"));
+    return retval;
+  }
+
+  // Try finding a match for given voice.
+  if (!aLang.IsVoid() && !aLang.IsEmpty()) {
+    if (FindVoiceByLang(aLang, &retval)) {
+      LOG(LogLevel::Debug,
+          ("nsSynthVoiceRegistry::FindBestMatch - Matched language (%s ~= %s)",
+           NS_ConvertUTF16toUTF8(aLang).get(),
+           NS_ConvertUTF16toUTF8(retval->mLang).get()));
+
+      return retval;
+    }
+  }
+
+  // Try UI language.
+  nsAutoCString uiLang;
+  LocaleService::GetInstance()->GetAppLocaleAsBCP47(uiLang);
+
+  if (FindVoiceByLang(NS_ConvertASCIItoUTF16(uiLang), &retval)) {
+    LOG(LogLevel::Debug,
+        ("nsSynthVoiceRegistry::FindBestMatch - Matched UI language (%s ~= %s)",
+         uiLang.get(), NS_ConvertUTF16toUTF8(retval->mLang).get()));
+
+    return retval;
+  }
+
+  // Try en-US, the language of locale "C"
+  if (FindVoiceByLang(u"en-US"_ns, &retval)) {
+    LOG(LogLevel::Debug, ("nsSynthVoiceRegistry::FindBestMatch - Matched C "
+                          "locale language (en-US ~= %s)",
+                          NS_ConvertUTF16toUTF8(retval->mLang).get()));
+
+    return retval;
+  }
+
+  // The top default voice is better than nothing...
+  if (!mDefaultVoices.IsEmpty()) {
+    return mDefaultVoices.LastElement();
+  }
+
+  return nullptr;
+}
+
+already_AddRefed<nsSpeechTask> nsSynthVoiceRegistry::SpeakUtterance(
+    SpeechSynthesisUtterance& aUtterance, const nsAString& aDocLang) {
+  nsString lang =
+      nsString(aUtterance.mLang.IsEmpty() ? aDocLang : aUtterance.mLang);
+  nsAutoString uri;
+
+  if (aUtterance.mVoice) {
+    aUtterance.mVoice->GetVoiceURI(uri);
+  }
+
+  // Get current audio volume to apply speech call
+  float volume = aUtterance.Volume();
+  RefPtr<AudioChannelService> service = AudioChannelService::GetOrCreate();
+  if (service) {
+    if (nsCOMPtr<nsPIDOMWindowInner> topWindow = aUtterance.GetOwner()) {
+      // TODO : use audio channel agent, open new bug to fix it.
+      AudioPlaybackConfig config =
+          service->GetMediaConfig(topWindow->GetOuterWindow());
+      volume = config.mMuted ? 0.0f : config.mVolume * volume;
+    }
+  }
+
+  nsCOMPtr<nsPIDOMWindowInner> window = aUtterance.GetOwner();
+  nsCOMPtr<Document> doc = window ? window->GetDoc() : nullptr;
+
+  bool isChrome = nsContentUtils::IsChromeDoc(doc);
+
+  RefPtr<nsSpeechTask> task;
+  if (XRE_IsContentProcess()) {
+    task = new SpeechTaskChild(&aUtterance, isChrome);
+    SpeechSynthesisRequestChild* actor = new SpeechSynthesisRequestChild(
+        static_cast<SpeechTaskChild*>(task.get()));
+    mSpeechSynthChild->SendPSpeechSynthesisRequestConstructor(
+        actor, aUtterance.mText, lang, uri, volume, aUtterance.Rate(),
+        aUtterance.Pitch(), isChrome);
+  } else {
+    task = new nsSpeechTask(&aUtterance, isChrome);
+    Speak(aUtterance.mText, lang, uri, volume, aUtterance.Rate(),
+          aUtterance.Pitch(), task);
+  }
+
+  return task.forget();
+}
+
+void nsSynthVoiceRegistry::Speak(const nsAString& aText, const nsAString& aLang,
+                                 const nsAString& aUri, const float& aVolume,
+                                 const float& aRate, const float& aPitch,
+                                 nsSpeechTask* aTask) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  if (!aTask->IsChrome() && nsContentUtils::ShouldResistFingerprinting()) {
+    aTask->ForceError(0, 0);
+    return;
+  }
+
+  VoiceData* voice = FindBestMatch(aUri, aLang);
+
+  if (!voice) {
+    NS_WARNING("No voices found.");
+    aTask->ForceError(0, 0);
+    return;
+  }
+
+  aTask->SetChosenVoiceURI(voice->mUri);
+
+  if (mUseGlobalQueue ||
+      StaticPrefs::media_webspeech_synth_force_global_queue()) {
+    LOG(LogLevel::Debug,
+        ("nsSynthVoiceRegistry::Speak queueing text='%s' lang='%s' uri='%s' "
+         "rate=%f pitch=%f",
+         NS_ConvertUTF16toUTF8(aText).get(), NS_ConvertUTF16toUTF8(aLang).get(),
+         NS_ConvertUTF16toUTF8(aUri).get(), aRate, aPitch));
+    RefPtr<GlobalQueueItem> item =
+        new GlobalQueueItem(voice, aTask, aText, aVolume, aRate, aPitch);
+    mGlobalQueue.AppendElement(item);
+
+    if (mGlobalQueue.Length() == 1) {
+      SpeakImpl(item->mVoice, item->mTask, item->mText, item->mVolume,
+                item->mRate, item->mPitch);
+    }
+  } else {
+    SpeakImpl(voice, aTask, aText, aVolume, aRate, aPitch);
+  }
+}
+
+void nsSynthVoiceRegistry::SpeakNext() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  LOG(LogLevel::Debug,
+      ("nsSynthVoiceRegistry::SpeakNext %d", mGlobalQueue.IsEmpty()));
+
+  SetIsSpeaking(false);
+
+  if (mGlobalQueue.IsEmpty()) {
+    return;
+  }
+
+  mGlobalQueue.RemoveElementAt(0);
+
+  while (!mGlobalQueue.IsEmpty()) {
+    RefPtr<GlobalQueueItem> item = mGlobalQueue.ElementAt(0);
+    if (item->mTask->IsPreCanceled()) {
+      mGlobalQueue.RemoveElementAt(0);
+      continue;
+    }
+    if (!item->mTask->IsPrePaused()) {
+      SpeakImpl(item->mVoice, item->mTask, item->mText, item->mVolume,
+                item->mRate, item->mPitch);
+    }
+    break;
+  }
+}
+
+void nsSynthVoiceRegistry::ResumeQueue() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  LOG(LogLevel::Debug,
+      ("nsSynthVoiceRegistry::ResumeQueue %d", mGlobalQueue.IsEmpty()));
+
+  if (mGlobalQueue.IsEmpty()) {
+    return;
+  }
+
+  RefPtr<GlobalQueueItem> item = mGlobalQueue.ElementAt(0);
+  if (!item->mTask->IsPrePaused()) {
+    SpeakImpl(item->mVoice, item->mTask, item->mText, item->mVolume,
+              item->mRate, item->mPitch);
+  }
+}
+
+bool nsSynthVoiceRegistry::IsSpeaking() { return mIsSpeaking; }
+
+void nsSynthVoiceRegistry::SetIsSpeaking(bool aIsSpeaking) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  // Only set to 'true' if global queue is enabled.
+  mIsSpeaking =
+      aIsSpeaking && (mUseGlobalQueue ||
+                      StaticPrefs::media_webspeech_synth_force_global_queue());
+
+  nsTArray<SpeechSynthesisParent*> ssplist;
+  GetAllSpeechSynthActors(ssplist);
+  for (uint32_t i = 0; i < ssplist.Length(); ++i) {
+    Unused << ssplist[i]->SendIsSpeakingChanged(aIsSpeaking);
+  }
+}
+
+void nsSynthVoiceRegistry::SpeakImpl(VoiceData* aVoice, nsSpeechTask* aTask,
+                                     const nsAString& aText,
+                                     const float& aVolume, const float& aRate,
+                                     const float& aPitch) {
+  LOG(LogLevel::Debug,
+      ("nsSynthVoiceRegistry::SpeakImpl queueing text='%s' uri='%s' rate=%f "
+       "pitch=%f",
+       NS_ConvertUTF16toUTF8(aText).get(),
+       NS_ConvertUTF16toUTF8(aVoice->mUri).get(), aRate, aPitch));
+
+  aTask->Init();
+
+  if (NS_FAILED(aVoice->mService->Speak(aText, aVoice->mUri, aVolume, aRate,
+                                        aPitch, aTask))) {
+    aTask->DispatchError(0, 0);
+  }
+}
+
+}  // namespace mozilla::dom