Move TTS extension API to chrome/browser/speech/

chrome/browser/extensions/extension_tts_api_chromeos.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/extensions/extension_tts_api_chromeos.h"
-
-#include <list>
-
-#include "base/bind.h"
-#include "base/memory/singleton.h"
-#include "base/memory/weak_ptr.h"
-#include "base/message_loop.h"
-#include "base/stl_util.h"
-#include "base/string_number_conversions.h"
-#include "chrome/browser/chromeos/dbus/dbus_thread_manager.h"
-#include "chrome/browser/chromeos/dbus/speech_synthesizer_client.h"
-#include "chrome/browser/extensions/extension_tts_api_controller.h"
-#include "chrome/browser/extensions/extension_tts_api_platform.h"
-
-using base::DoubleToString;
-
-namespace {
-const int kSpeechCheckDelayIntervalMs = 100;
-};
-
-// Very simple queue of utterances that can't be spoken because audio
-// isn't initialized yet.
-struct QueuedUtterance {
-  int utterance_id;
-  std::string utterance;
-  std::string lang;
-  UtteranceContinuousParameters params;
-};
-
-class ExtensionTtsPlatformImplChromeOs
-    : public ExtensionTtsPlatformImpl {
- public:
-  virtual bool PlatformImplAvailable() {
-    return true;
-  }
-
-  virtual bool Speak(
-      int utterance_id,
-      const std::string& utterance,
-      const std::string& lang,
-      const UtteranceContinuousParameters& params);
-
-  virtual bool StopSpeaking();
-
-  virtual bool SendsEvent(TtsEventType event_type);
-
-  // Get the single instance of this class.
-  static ExtensionTtsPlatformImplChromeOs* GetInstance();
-
-  // TTS won't begin until this is called.
-  void Enable();
-
- private:
-  ExtensionTtsPlatformImplChromeOs();
-  virtual ~ExtensionTtsPlatformImplChromeOs() {}
-
-  void PollUntilSpeechFinishes(int utterance_id);
-  void ContinuePollingIfSpeechIsNotFinished(int utterance_id, bool result);
-
-  void AppendSpeakOption(std::string key,
-                         std::string value,
-                         std::string* options);
-
-  int utterance_id_;
-  int utterance_length_;
-  std::list<QueuedUtterance*> queued_utterances_;
-  bool enabled_;
-  base::WeakPtrFactory<ExtensionTtsPlatformImplChromeOs> weak_ptr_factory_;
-
-  friend struct DefaultSingletonTraits<ExtensionTtsPlatformImplChromeOs>;
-
-  DISALLOW_COPY_AND_ASSIGN(ExtensionTtsPlatformImplChromeOs);
-};
-
-// static
-ExtensionTtsPlatformImpl* ExtensionTtsPlatformImpl::GetInstance() {
-  return ExtensionTtsPlatformImplChromeOs::GetInstance();
-}
-
-ExtensionTtsPlatformImplChromeOs::ExtensionTtsPlatformImplChromeOs()
-    : enabled_(false),
-      ALLOW_THIS_IN_INITIALIZER_LIST(weak_ptr_factory_(this)) {
-}
-
-bool ExtensionTtsPlatformImplChromeOs::Speak(
-    int utterance_id,
-    const std::string& utterance,
-    const std::string& lang,
-    const UtteranceContinuousParameters& params) {
-  if (!enabled_) {
-    QueuedUtterance *queued = new QueuedUtterance();
-    queued->utterance_id = utterance_id;
-    queued->utterance = utterance;
-    queued->lang = lang;
-    queued->params = params;
-    queued_utterances_.push_back(queued);
-    return true;
-  }
-
-  utterance_id_ = utterance_id;
-  utterance_length_ = utterance.size();
-
-  std::string options;
-
-  if (!lang.empty()) {
-    AppendSpeakOption(
-        chromeos::SpeechSynthesizerClient::kSpeechPropertyLocale,
-        lang,
-        &options);
-  }
-
-  if (params.rate >= 0.0) {
-    AppendSpeakOption(
-        chromeos::SpeechSynthesizerClient::kSpeechPropertyRate,
-        DoubleToString(params.rate),
-        &options);
-  }
-
-  if (params.pitch >= 0.0) {
-    // The TTS service allows a range of 0 to 2 for speech pitch.
-    AppendSpeakOption(
-        chromeos::SpeechSynthesizerClient::kSpeechPropertyPitch,
-        DoubleToString(params.pitch),
-        &options);
-  }
-
-  if (params.volume >= 0.0) {
-    // The Chrome OS TTS service allows a range of 0 to 5 for speech volume,
-    // but 5 clips, so map to a range of 0...4.
-    AppendSpeakOption(
-        chromeos::SpeechSynthesizerClient::kSpeechPropertyVolume,
-        DoubleToString(params.volume * 4),
-        &options);
-  }
-
-  chromeos::SpeechSynthesizerClient* speech_synthesizer_client =
-      chromeos::DBusThreadManager::Get()->GetSpeechSynthesizerClient();
-
-  speech_synthesizer_client->Speak(utterance, options);
-  if (utterance_id_ >= 0) {
-    ExtensionTtsController* controller = ExtensionTtsController::GetInstance();
-    controller->OnTtsEvent(utterance_id_, TTS_EVENT_START, 0, std::string());
-    PollUntilSpeechFinishes(utterance_id_);
-  }
-
-  return true;
-}
-
-bool ExtensionTtsPlatformImplChromeOs::StopSpeaking() {
-  // If we haven't been enabled yet, clear the internal queue.
-  if (!enabled_) {
-    STLDeleteElements(&queued_utterances_);
-    return true;
-  }
-
-  chromeos::DBusThreadManager::Get()->GetSpeechSynthesizerClient()->
-      StopSpeaking();
-  return true;
-}
-
-bool ExtensionTtsPlatformImplChromeOs::SendsEvent(TtsEventType event_type) {
-  return (event_type == TTS_EVENT_START ||
-          event_type == TTS_EVENT_END ||
-          event_type == TTS_EVENT_ERROR);
-}
-
-void ExtensionTtsPlatformImplChromeOs::Enable() {
-  enabled_ = true;
-  while (!queued_utterances_.empty()) {
-    QueuedUtterance* queued = queued_utterances_.front();
-    Speak(queued->utterance_id,
-          queued->utterance,
-          queued->lang,
-          queued->params);
-    delete queued;
-    queued_utterances_.pop_front();
-  }
-}
-
-void ExtensionTtsPlatformImplChromeOs::PollUntilSpeechFinishes(
-    int utterance_id) {
-  if (utterance_id != utterance_id_) {
-    // This utterance must have been interrupted or cancelled.
-    return;
-  }
-  chromeos::SpeechSynthesizerClient* speech_synthesizer_client =
-      chromeos::DBusThreadManager::Get()->GetSpeechSynthesizerClient();
-  speech_synthesizer_client->IsSpeaking(base::Bind(
-      &ExtensionTtsPlatformImplChromeOs::ContinuePollingIfSpeechIsNotFinished,
-      weak_ptr_factory_.GetWeakPtr(), utterance_id));
-}
-
-void ExtensionTtsPlatformImplChromeOs::ContinuePollingIfSpeechIsNotFinished(
-    int utterance_id, bool is_speaking) {
-  if (utterance_id != utterance_id_) {
-    // This utterance must have been interrupted or cancelled.
-    return;
-  }
-  if (!is_speaking) {
-    ExtensionTtsController* controller = ExtensionTtsController::GetInstance();
-    controller->OnTtsEvent(
-        utterance_id_, TTS_EVENT_END, utterance_length_, std::string());
-    return;
-  }
-  // Continue polling.
-  MessageLoop::current()->PostDelayedTask(
-      FROM_HERE, base::Bind(
-          &ExtensionTtsPlatformImplChromeOs::PollUntilSpeechFinishes,
-          weak_ptr_factory_.GetWeakPtr(),
-          utterance_id),
-      kSpeechCheckDelayIntervalMs);
-}
-
-void ExtensionTtsPlatformImplChromeOs::AppendSpeakOption(
-    std::string key,
-    std::string value,
-    std::string* options) {
-  *options +=
-      key +
-      chromeos::SpeechSynthesizerClient::kSpeechPropertyEquals +
-      value +
-      chromeos::SpeechSynthesizerClient::kSpeechPropertyDelimiter;
-}
-
-// static
-ExtensionTtsPlatformImplChromeOs*
-ExtensionTtsPlatformImplChromeOs::GetInstance() {
-  return Singleton<ExtensionTtsPlatformImplChromeOs>::get();
-}
-
-// global
-void EnableChromeOsTts() {
-  ExtensionTtsPlatformImplChromeOs::GetInstance()->Enable();
-}