root/chrome/browser/speech/tts_android.cc

DEFINITIONS

1. GetInstance
2. PlatformImplAvailable
3. Speak
4. StopSpeaking
5. Pause
6. Resume
7. IsSpeaking
8. GetVoices
9. VoicesChanged
10. OnEndEvent
11. OnErrorEvent
12. OnStartEvent
13. SendFinalTtsEvent
14. GetInstance
15. Register

// 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_android.h"

#include <string>

#include "base/android/jni_string.h"
#include "base/memory/singleton.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/speech/tts_controller.h"
#include "jni/TtsPlatformImpl_jni.h"

using base::android::AttachCurrentThread;

// static
TtsPlatformImpl* TtsPlatformImpl::GetInstance() {
  return TtsPlatformImplAndroid::GetInstance();
}

TtsPlatformImplAndroid::TtsPlatformImplAndroid()
    : utterance_id_(0) {
  JNIEnv* env = AttachCurrentThread();
  java_ref_.Reset(
      Java_TtsPlatformImpl_create(env,
                                  reinterpret_cast<intptr_t>(this),
                                  base::android::GetApplicationContext()));
}

TtsPlatformImplAndroid::~TtsPlatformImplAndroid() {
  JNIEnv* env = AttachCurrentThread();
  Java_TtsPlatformImpl_destroy(env, java_ref_.obj());
}

bool TtsPlatformImplAndroid::PlatformImplAvailable() {
  return true;
}

bool TtsPlatformImplAndroid::Speak(
    int utterance_id,
    const std::string& utterance,
    const std::string& lang,
    const VoiceData& voice,
    const UtteranceContinuousParameters& params) {
  JNIEnv* env = AttachCurrentThread();
  if (!Java_TtsPlatformImpl_isInitialized(env, java_ref_.obj()))
    return false;

  jboolean success = Java_TtsPlatformImpl_speak(
      env, java_ref_.obj(),
      utterance_id,
      base::android::ConvertUTF8ToJavaString(env, utterance).Release(),
      base::android::ConvertUTF8ToJavaString(env, lang).Release(),
      params.rate, params.pitch, params.volume);
  if (!success)
    return false;

  utterance_ = utterance;
  utterance_id_ = utterance_id;
  return true;
}

bool TtsPlatformImplAndroid::StopSpeaking() {
  JNIEnv* env = AttachCurrentThread();
  Java_TtsPlatformImpl_stop(env, java_ref_.obj());
  utterance_id_ = 0;
  utterance_.clear();
  return true;
}

void TtsPlatformImplAndroid::Pause() {
  StopSpeaking();
}

void TtsPlatformImplAndroid::Resume() {
}

bool TtsPlatformImplAndroid::IsSpeaking() {
  return (utterance_id_ != 0);
}

void TtsPlatformImplAndroid::GetVoices(
    std::vector<VoiceData>* out_voices) {
  JNIEnv* env = AttachCurrentThread();
  if (!Java_TtsPlatformImpl_isInitialized(env, java_ref_.obj()))
    return;

  int count = Java_TtsPlatformImpl_getVoiceCount(env, java_ref_.obj());
  for (int i = 0; i < count; ++i) {
    out_voices->push_back(VoiceData());
    VoiceData& data = out_voices->back();
    data.native = true;
    data.name = base::android::ConvertJavaStringToUTF8(
        Java_TtsPlatformImpl_getVoiceName(env, java_ref_.obj(), i));
    data.lang = base::android::ConvertJavaStringToUTF8(
        Java_TtsPlatformImpl_getVoiceLanguage(env, java_ref_.obj(), i));
    data.gender = TTS_GENDER_NONE;
    data.events.insert(TTS_EVENT_START);
    data.events.insert(TTS_EVENT_END);
    data.events.insert(TTS_EVENT_ERROR);
  }
}

void TtsPlatformImplAndroid::VoicesChanged(JNIEnv* env, jobject obj) {
  TtsController::GetInstance()->VoicesChanged();
}

void TtsPlatformImplAndroid::OnEndEvent(
    JNIEnv* env, jobject obj, jint utterance_id) {
  SendFinalTtsEvent(utterance_id, TTS_EVENT_END,
                    static_cast<int>(utterance_.size()));
}

void TtsPlatformImplAndroid::OnErrorEvent(
    JNIEnv* env, jobject obj, jint utterance_id) {
  SendFinalTtsEvent(utterance_id, TTS_EVENT_ERROR, 0);
}

void TtsPlatformImplAndroid::OnStartEvent(
    JNIEnv* env, jobject obj, jint utterance_id) {
  if (utterance_id != utterance_id_)
    return;

  TtsController::GetInstance()->OnTtsEvent(
      utterance_id_, TTS_EVENT_START, 0, std::string());
}

void TtsPlatformImplAndroid::SendFinalTtsEvent(
    int utterance_id, TtsEventType event_type, int char_index) {
  if (utterance_id != utterance_id_)
    return;

  TtsController::GetInstance()->OnTtsEvent(
      utterance_id_, event_type, char_index, std::string());
  utterance_id_ = 0;
  utterance_.clear();
}

// static
TtsPlatformImplAndroid* TtsPlatformImplAndroid::GetInstance() {
  return Singleton<TtsPlatformImplAndroid>::get();
}

// static
bool TtsPlatformImplAndroid::Register(JNIEnv* env) {
  return RegisterNativesImpl(env);
}