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// Copyright (c) 2010 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.h"
#include "base/singleton.h"
#include "base/string_number_conversions.h"
#include "chrome/browser/chromeos/cros/cros_library.h"
#include "chrome/browser/chromeos/cros/speech_synthesis_library.h"
namespace util = extension_tts_api_util;
using base::DoubleToString;
namespace {
const char kCrosLibraryNotLoadedError[] = "Cros shared library not loaded.";
};
class ExtensionTtsPlatformImplChromeOs : public ExtensionTtsPlatformImpl {
public:
virtual bool Speak(
const std::string& utterance,
const std::string& language,
const std::string& gender,
double rate,
double pitch,
double volume);
virtual bool StopSpeaking();
virtual bool IsSpeaking();
// Get the single instance of this class.
static ExtensionTtsPlatformImplChromeOs* GetInstance();
private:
ExtensionTtsPlatformImplChromeOs() {}
virtual ~ExtensionTtsPlatformImplChromeOs() {}
friend struct DefaultSingletonTraits<ExtensionTtsPlatformImplChromeOs>;
DISALLOW_COPY_AND_ASSIGN(ExtensionTtsPlatformImplChromeOs);
};
// static
ExtensionTtsPlatformImpl* ExtensionTtsPlatformImpl::GetInstance() {
return ExtensionTtsPlatformImplChromeOs::GetInstance();
}
bool ExtensionTtsPlatformImplChromeOs::Speak(
const std::string& utterance,
const std::string& language,
const std::string& gender,
double rate,
double pitch,
double volume) {
chromeos::CrosLibrary* cros_library = chromeos::CrosLibrary::Get();
if (!cros_library->EnsureLoaded()) {
set_error(kCrosLibraryNotLoadedError);
return false;
}
std::string options;
if (!language.empty()) {
util::AppendSpeakOption(
std::string(util::kNameKey), language, &options);
}
if (!gender.empty()) {
util::AppendSpeakOption(
std::string(util::kGenderKey), gender, &options);
}
if (rate >= 0.0) {
util::AppendSpeakOption(
std::string(util::kRateKey), DoubleToString(rate * 5), &options);
}
if (pitch >= 0.0) {
// The TTS service allows a range of 0 to 2 for speech pitch.
util::AppendSpeakOption(
std::string(util::kPitchKey), DoubleToString(pitch * 2), &options);
}
if (volume >= 0.0) {
// The TTS service allows a range of 0 to 5 for speech volume.
util::AppendSpeakOption(
std::string(util::kVolumeKey), DoubleToString(volume * 5), &options);
}
if (!options.empty()) {
cros_library->GetSpeechSynthesisLibrary()->SetSpeakProperties(
options.c_str());
}
return cros_library->GetSpeechSynthesisLibrary()->Speak(utterance.c_str());
}
bool ExtensionTtsPlatformImplChromeOs::StopSpeaking() {
if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
return chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
StopSpeaking();
}
set_error(kCrosLibraryNotLoadedError);
return false;
}
bool ExtensionTtsPlatformImplChromeOs::IsSpeaking() {
if (chromeos::CrosLibrary::Get()->EnsureLoaded()) {
return chromeos::CrosLibrary::Get()->GetSpeechSynthesisLibrary()->
IsSpeaking();
}
set_error(kCrosLibraryNotLoadedError);
return false;
}
// static
ExtensionTtsPlatformImplChromeOs*
ExtensionTtsPlatformImplChromeOs::GetInstance() {
return Singleton<ExtensionTtsPlatformImplChromeOs>::get();
}
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