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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_SPEECH_TTS_MAC_H_
#define CONTENT_BROWSER_SPEECH_TTS_MAC_H_
#include "base/callback.h"
#include "base/mac/scoped_nsobject.h"
#include "base/no_destructor.h"
#include "content/browser/speech/tts_platform_impl.h"
#import <Cocoa/Cocoa.h>
class TtsPlatformImplMac;
@interface ChromeTtsDelegate : NSObject <NSSpeechSynthesizerDelegate>
- (id)initWithPlatformImplMac:(TtsPlatformImplMac*)ttsImplMac;
@end
// Subclass of NSSpeechSynthesizer that takes an utterance
// string on initialization, retains it and only allows it
// to be spoken once.
//
// We construct a new NSSpeechSynthesizer for each utterance, for
// two reasons:
// 1. To associate delegate callbacks with a particular utterance,
// without assuming anything undocumented about the protocol.
// 2. To work around http://openradar.appspot.com/radar?id=2854403,
// where Nuance voices don't retain the utterance string and
// crash when trying to call willSpeakWord.
@interface SingleUseSpeechSynthesizer : NSSpeechSynthesizer
- (id)initWithUtterance:(NSString*)utterance;
- (bool)startSpeakingRetainedUtterance;
- (bool)startSpeakingString:(NSString*)utterance;
@end
class TtsPlatformImplMac : public content::TtsPlatformImpl {
public:
~TtsPlatformImplMac() override;
TtsPlatformImplMac(const TtsPlatformImplMac&) = delete;
TtsPlatformImplMac& operator=(const TtsPlatformImplMac&) = delete;
bool PlatformImplSupported() override;
bool PlatformImplInitialized() override;
void Speak(int utterance_id,
const std::string& utterance,
const std::string& lang,
const content::VoiceData& voice,
const content::UtteranceContinuousParameters& params,
base::OnceCallback<void(bool)> on_speak_finished) override;
bool StopSpeaking() override;
void Pause() override;
void Resume() override;
bool IsSpeaking() override;
void GetVoices(std::vector<content::VoiceData>* out_voices) override;
// Called by ChromeTtsDelegate when we get a callback from the
// native speech engine.
void OnSpeechEvent(NSSpeechSynthesizer* sender,
content::TtsEventType event_type,
int char_index,
int char_length,
const std::string& error_message);
// Get the single instance of this class.
CONTENT_EXPORT static TtsPlatformImplMac* GetInstance();
CONTENT_EXPORT static std::vector<content::VoiceData>& VoicesRefForTesting();
private:
friend base::NoDestructor<TtsPlatformImplMac>;
TtsPlatformImplMac();
void ProcessSpeech(int utterance_id,
const std::string& lang,
const content::VoiceData& voice,
const content::UtteranceContinuousParameters& params,
base::OnceCallback<void(bool)> on_speak_finished,
const std::string& parsed_utterance);
base::scoped_nsobject<SingleUseSpeechSynthesizer> speech_synthesizer_;
base::scoped_nsobject<ChromeTtsDelegate> delegate_;
int utterance_id_ = -1;
std::string utterance_;
int last_char_index_ = 0;
bool paused_ = false;
};
#endif // CONTENT_BROWSER_SPEECH_TTS_MAC_H_
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