Implement web speech synthesis.

chrome/browser/speech/tts_request_handler.cc

+// Copyright (c) 2013 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/speech/tts_request_handler.h"
+
+#include "base/logging.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/speech/tts_controller.h"
+#include "content/public/browser/browser_context.h"
+
+class TtsRequestEventHandler : public UtteranceEventDelegate {
+ public:
+  explicit TtsRequestEventHandler(content::TtsDispatcherHost* dispatcher_host);
+  virtual void OnTtsEvent(Utterance* utterance,
+                          TtsEventType event_type,
+                          int char_index,
+                          const std::string& error_message) OVERRIDE;
+ private:
+  content::TtsDispatcherHost* dispatcher_host_;
+};
+
+TtsRequestEventHandler::TtsRequestEventHandler(
+    content::TtsDispatcherHost* dispatcher_host)
+    : dispatcher_host_(dispatcher_host) {
+}
+
+void TtsRequestEventHandler::OnTtsEvent(Utterance* utterance,
+                                        TtsEventType event_type,
+                                        int char_index,
+                                        const std::string& error_message) {
+  switch (event_type) {
+    case TTS_EVENT_START:
+      dispatcher_host_->DidStartSpeaking(utterance->src_id());
+      break;
+    case TTS_EVENT_END:
+      dispatcher_host_->DidFinishSpeaking(utterance->src_id());
+      break;
+    case TTS_EVENT_WORD:
+      dispatcher_host_->WordBoundary(
+          utterance->src_id(), char_index);
+      break;
+    case TTS_EVENT_SENTENCE:
+      dispatcher_host_->SentenceBoundary(
+          utterance->src_id(), char_index);
+      break;
+    case TTS_EVENT_MARKER:
+      dispatcher_host_->MarkerEvent(
+          utterance->src_id(), char_index);
+      break;
+    case TTS_EVENT_INTERRUPTED:
+      dispatcher_host_->WasInterrupted(utterance->src_id());
+      break;
+    case TTS_EVENT_CANCELLED:
+      dispatcher_host_->WasCancelled(utterance->src_id());
+      break;
+    case TTS_EVENT_ERROR:
+      dispatcher_host_->SpeakingErrorOccurred(
+          utterance->src_id(), error_message);
+      break;
+  }
+
+  if (utterance->finished())
+    delete this;
+}
+
+
+TtsRequestHandler::TtsRequestHandler() {
+}
+
+TtsRequestHandler::~TtsRequestHandler() {
+}
+
+void TtsRequestHandler::OnInitializeVoiceList(
+    content::TtsDispatcherHost* dispatcher_host) {
+  content::BrowserContext* context = dispatcher_host->GetBrowserContext();
+  Profile* profile = Profile::FromBrowserContext(context);
+  CHECK(profile);
+  TtsController* tts_controller = TtsController::GetInstance();
+  std::vector<VoiceData> voices;
+  tts_controller->GetVoices(profile, &voices);
+
+  std::vector<content::TtsVoice> out_voices;
+  out_voices.resize(voices.size());
+  for (size_t i = 0; i < voices.size(); ++i) {
+    content::TtsVoice& out_voice = out_voices[i];
+    out_voice.voice_uri = voices[i].name;
+    out_voice.name = voices[i].name;
+    out_voice.lang = voices[i].lang;
+    out_voice.local_service = true;
+    out_voice.is_default = (i == 0);
+  }
+  dispatcher_host->SendVoiceList(out_voices);
+}
+
+void TtsRequestHandler::OnSpeak(content::TtsDispatcherHost* dispatcher_host,
+                                const content::TtsUtteranceRequest& request) {
+  content::BrowserContext* context = dispatcher_host->GetBrowserContext();
+  Profile* profile = Profile::FromBrowserContext(context);
+  CHECK(profile);
+
+  scoped_ptr<Utterance> utterance(new Utterance(profile));
+  utterance->set_src_id(request.id);
+  utterance->set_text(request.text);
+  utterance->set_lang(request.lang);
+  utterance->set_voice_name(request.voice);
+  utterance->set_can_enqueue(true);
+
+  UtteranceContinuousParameters params;
+  params.rate = request.rate;
+  params.pitch = request.pitch;
+  params.volume = request.volume;
+  utterance->set_continuous_parameters(params);
+
+  utterance->set_event_delegate(new TtsRequestEventHandler(dispatcher_host));
+
+  TtsController::GetInstance()->SpeakOrEnqueue(utterance.release());
+}
+
+void TtsRequestHandler::OnPause(content::TtsDispatcherHost* dispatcher_host) {
+  // TODO(dmazzoni): Not supported by TtsController yet.
+}
+
+void TtsRequestHandler::OnResume(content::TtsDispatcherHost* dispatcher_host) {
+  // TODO(dmazzoni): Not supported by TtsController yet.
+}
+
+void TtsRequestHandler::OnCancel(content::TtsDispatcherHost* dispatcher_host) {
+  TtsController::GetInstance()->Stop();
+}