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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_CHROMEOS_H_
#define CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_CHROMEOS_H_
#include "base/scoped_observation.h"
#include "base/values.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_observer.h"
#include "chrome/browser/speech/extension_api/tts_engine_extension_api.h"
#include "chromeos/services/tts/public/mojom/tts_service.mojom.h"
#include "mojo/public/cpp/bindings/receiver_set.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace content {
class BrowserContext;
}
// TtsEngineDelegate implementation used by TtsController on Chrome OS.
class TtsExtensionEngineChromeOS
: public TtsExtensionEngine,
public chromeos::tts::mojom::TtsEventObserver,
public ProfileObserver {
public:
TtsExtensionEngineChromeOS();
~TtsExtensionEngineChromeOS() override;
// TtsExtensionEngine:
void SendAudioBuffer(int utterance_id,
const std::vector<float>& audio_buffer,
int char_index,
bool is_last_buffer) override;
// TtsEngineDelegate:
void Speak(content::TtsUtterance* utterance,
const content::VoiceData& voice) override;
void Stop(content::TtsUtterance* utterance) override;
void Pause(content::TtsUtterance* utterance) override;
void Resume(content::TtsUtterance* utterance) override;
void LoadBuiltInTtsEngine(content::BrowserContext* browser_context) override;
bool IsBuiltInTtsEngineInitialized(
content::BrowserContext* browser_context) override;
// TtsEventObserver:
void OnStart() override;
void OnTimepoint(int32_t char_index) override;
void OnEnd() override;
void OnError() override;
// ProfileObserver:
void OnProfileWillBeDestroyed(Profile* profile) override;
private:
// Unconditionally updates audio stream options.
void UpdateAudioStreamOptions(
chromeos::tts::mojom::AudioParametersPtr audio_parameters);
// Refresh audio stream options from an extension's manifest. Returns true if
// parameters were updated.
bool RefreshAudioStreamOptionsForExtension(const std::string& engine_id,
Profile* profile);
// Helper to start audio playback.
void Play(base::Value::List args,
const std::string& engine_id,
Profile* profile);
mojo::Remote<chromeos::tts::mojom::PlaybackTtsStream> playback_tts_stream_;
mojo::ReceiverSet<chromeos::tts::mojom::TtsEventObserver>
tts_event_observer_receiver_set_;
int current_utterance_id_ = -1;
int current_utterance_length_ = -1;
double current_volume_ = 1;
base::ScopedObservation<Profile, ProfileObserver>
current_utterance_profile_observer_{this};
chromeos::tts::mojom::AudioParametersPtr audio_parameters_;
extensions::ExtensionId current_playback_engine_;
};
#endif // CHROME_BROWSER_SPEECH_EXTENSION_API_TTS_ENGINE_EXTENSION_API_CHROMEOS_H_
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