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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 "extension_tts_api.h"
#include <atlbase.h>
#include <atlcom.h>
#include <sapi.h>
#include "base/scoped_comptr_win.h"
#include "base/singleton.h"
#include "base/values.h"
class SpeechSynthesizerWrapper {
public:
SpeechSynthesizerWrapper() : speech_synthesizer_(NULL),
paused_(false),
permanent_failure_(false) {
InitializeSpeechSynthesizer();
}
bool InitializeSpeechSynthesizer() {
if (!SUCCEEDED(CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_SERVER,
IID_ISpVoice, reinterpret_cast<void**>(&speech_synthesizer_)))) {
permanent_failure_ = true;
return false;
}
if (paused_)
speech_synthesizer_->Resume();
return true;
}
ScopedComPtr<ISpVoice> speech_synthesizer() {
return speech_synthesizer_;
}
bool paused() {
return paused_;
}
void paused(bool state) {
paused_ = state;
}
private:
ScopedComPtr<ISpVoice> speech_synthesizer_;
bool paused_;
// Indicates an error retrieving the SAPI COM interface.
bool permanent_failure_;
};
typedef Singleton<SpeechSynthesizerWrapper> SpeechSynthesizerSingleton;
bool ExtensionTtsSpeakFunction::RunImpl() {
ScopedComPtr<ISpVoice> speech_synthesizer =
SpeechSynthesizerSingleton::get()->speech_synthesizer();
if (speech_synthesizer) {
std::wstring utterance;
EXTENSION_FUNCTION_VALIDATE(args_->GetString(0, &utterance));
if (SpeechSynthesizerSingleton::get()->paused())
speech_synthesizer->Resume();
speech_synthesizer->Speak(
utterance.c_str(), SPF_ASYNC | SPF_PURGEBEFORESPEAK, NULL);
return true;
}
return false;
}
bool ExtensionTtsStopSpeakingFunction::RunImpl() {
// We need to keep track of the paused state since SAPI doesn't have a stop
// method.
ScopedComPtr<ISpVoice> speech_synthesizer =
SpeechSynthesizerSingleton::get()->speech_synthesizer();
if (speech_synthesizer && !SpeechSynthesizerSingleton::get()->paused()) {
speech_synthesizer->Pause();
SpeechSynthesizerSingleton::get()->paused(true);
}
return true;
}
bool ExtensionTtsIsSpeakingFunction::RunImpl() {
return false;
}
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