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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 <string>
#include "base/singleton.h"
#include "base/values.h"
#include "chrome/browser/extensions/extension_function.h"
#import <Cocoa/Cocoa.h>
namespace util = extension_tts_api_util;
class ExtensionTtsPlatformImplMac : 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 ExtensionTtsPlatformImplMac* GetInstance();
private:
ExtensionTtsPlatformImplMac();
virtual ~ExtensionTtsPlatformImplMac() {}
NSSpeechSynthesizer* speech_synthesizer_;
friend struct DefaultSingletonTraits<ExtensionTtsPlatformImplMac>;
DISALLOW_COPY_AND_ASSIGN(ExtensionTtsPlatformImplMac);
};
// static
ExtensionTtsPlatformImpl* ExtensionTtsPlatformImpl::GetInstance() {
return ExtensionTtsPlatformImplMac::GetInstance();
}
bool ExtensionTtsPlatformImplMac::Speak(
const std::string& utterance,
const std::string& language,
const std::string& gender,
double rate,
double pitch,
double volume) {
// NSSpeechSynthesizer equivalents for kGenderKey and kLanguageNameKey do
// not exist and thus are not supported.
if (rate >= 0.0) {
// The TTS api defines rate via words per minute.
[speech_synthesizer_
setObject:[NSNumber numberWithInt:rate * 400]
forProperty:NSSpeechRateProperty error:nil];
}
if (pitch >= 0.0) {
// The TTS api allows an approximate range of 30 to 65 for speech pitch.
[speech_synthesizer_
setObject: [NSNumber numberWithInt:(pitch * 35 + 30)]
forProperty:NSSpeechPitchBaseProperty error:nil];
}
if (volume >= 0.0) {
[speech_synthesizer_
setObject: [NSNumber numberWithFloat:volume]
forProperty:NSSpeechVolumeProperty error:nil];
}
return [speech_synthesizer_ startSpeakingString:
[NSString stringWithUTF8String: utterance.c_str()]];
}
bool ExtensionTtsPlatformImplMac::StopSpeaking() {
[speech_synthesizer_ stopSpeaking];
return true;
}
bool ExtensionTtsPlatformImplMac::IsSpeaking() {
return [speech_synthesizer_ isSpeaking];
}
ExtensionTtsPlatformImplMac::ExtensionTtsPlatformImplMac() {
speech_synthesizer_ = [[NSSpeechSynthesizer alloc] init];
}
// static
ExtensionTtsPlatformImplMac* ExtensionTtsPlatformImplMac::GetInstance() {
return Singleton<ExtensionTtsPlatformImplMac>::get();
}
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