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// Copyright (c) 2011 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 "base/memory/singleton.h"
#include "base/message_loop.h"
#include "base/string_number_conversions.h"
#include "base/task.h"
#include "chrome/browser/chromeos/cros/cros_library.h"
#include "chrome/browser/chromeos/cros/speech_synthesis_library.h"
#include "chrome/browser/extensions/extension_tts_api_controller.h"
#include "chrome/browser/extensions/extension_tts_api_platform.h"
using base::DoubleToString;
namespace {
const char kCrosLibraryNotLoadedError[] = "Cros shared library not loaded.";
const int kSpeechCheckDelayIntervalMs = 100;
};
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();
private:
ExtensionTtsPlatformImplChromeOs()
: ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)) {}
virtual ~ExtensionTtsPlatformImplChromeOs() {}
void PollUntilSpeechFinishes(int utterance_id);
void AppendSpeakOption(std::string key,
std::string value,
std::string* options);
int utterance_id_;
int utterance_length_;
ScopedRunnableMethodFactory<ExtensionTtsPlatformImplChromeOs> method_factory_;
friend struct DefaultSingletonTraits<ExtensionTtsPlatformImplChromeOs>;
DISALLOW_COPY_AND_ASSIGN(ExtensionTtsPlatformImplChromeOs);
};
// static
ExtensionTtsPlatformImpl* ExtensionTtsPlatformImpl::GetInstance() {
return ExtensionTtsPlatformImplChromeOs::GetInstance();
}
bool ExtensionTtsPlatformImplChromeOs::Speak(
int utterance_id,
const std::string& utterance,
const std::string& lang,
const UtteranceContinuousParameters& params) {
chromeos::CrosLibrary* cros_library = chromeos::CrosLibrary::Get();
if (!cros_library->EnsureLoaded()) {
set_error(kCrosLibraryNotLoadedError);
return false;
}
utterance_id_ = utterance_id;
utterance_length_ = utterance.size();
std::string options;
if (!lang.empty()) {
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyLocale,
lang,
&options);
}
if (params.rate >= 0.0) {
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyRate,
DoubleToString(1.5 + params.rate * 2.5),
&options);
}
if (params.pitch >= 0.0) {
// The TTS service allows a range of 0 to 2 for speech pitch.
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyPitch,
DoubleToString(params.pitch),
&options);
}
if (params.volume >= 0.0) {
// The TTS service allows a range of 0 to 5 for speech volume.
AppendSpeakOption(
chromeos::SpeechSynthesisLibrary::kSpeechPropertyVolume,
DoubleToString(params.volume * 5),
&options);
}
if (!options.empty()) {
cros_library->GetSpeechSynthesisLibrary()->SetSpeakProperties(
options.c_str());
}
bool result =
cros_library->GetSpeechSynthesisLibrary()->Speak(utterance.c_str());
if (result) {
ExtensionTtsController* controller = ExtensionTtsController::GetInstance();
controller->OnTtsEvent(utterance_id_, TTS_EVENT_START, 0, std::string());
PollUntilSpeechFinishes(utterance_id_);
}
return result;
}
bool ExtensionTtsPlatformImplChromeOs::StopSpeaking() {
if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
return chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
StopSpeaking();
}
set_error(kCrosLibraryNotLoadedError);
return false;
}
bool ExtensionTtsPlatformImplChromeOs::SendsEvent(TtsEventType event_type) {
return (event_type == TTS_EVENT_START ||
event_type == TTS_EVENT_END ||
event_type == TTS_EVENT_ERROR);
}
void ExtensionTtsPlatformImplChromeOs::PollUntilSpeechFinishes(
int utterance_id) {
if (utterance_id != utterance_id_) {
// This utterance must have been interrupted or cancelled.
return;
}
chromeos::CrosLibrary* cros_library = chromeos::CrosLibrary::Get();
ExtensionTtsController* controller = ExtensionTtsController::GetInstance();
if (!cros_library->EnsureLoaded()) {
controller->OnTtsEvent(
utterance_id_, TTS_EVENT_ERROR, 0, kCrosLibraryNotLoadedError);
return;
}
if (!cros_library->GetSpeechSynthesisLibrary()->IsSpeaking()) {
controller->OnTtsEvent(
utterance_id_, TTS_EVENT_END, utterance_length_, std::string());
return;
}
MessageLoop::current()->PostDelayedTask(
FROM_HERE, method_factory_.NewRunnableMethod(
&ExtensionTtsPlatformImplChromeOs::PollUntilSpeechFinishes,
utterance_id),
kSpeechCheckDelayIntervalMs);
}
void ExtensionTtsPlatformImplChromeOs::AppendSpeakOption(
std::string key,
std::string value,
std::string* options) {
*options +=
key +
chromeos::SpeechSynthesisLibrary::kSpeechPropertyEquals +
value +
chromeos::SpeechSynthesisLibrary::kSpeechPropertyDelimiter;
}
// static
ExtensionTtsPlatformImplChromeOs*
ExtensionTtsPlatformImplChromeOs::GetInstance() {
return Singleton<ExtensionTtsPlatformImplChromeOs>::get();
}
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