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// Copyright (c) 2012 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.
#ifndef CHROME_BROWSER_SPEECH_TTS_PLATFORM_H_
#define CHROME_BROWSER_SPEECH_TTS_PLATFORM_H_
#include <string>
#include "chrome/browser/speech/tts_controller.h"
// Abstract class that defines the native platform TTS interface,
// subclassed by specific implementations on Win, Mac, etc.
class TtsPlatformImpl {
public:
static TtsPlatformImpl* GetInstance();
// Returns true if this platform implementation is supported and available.
virtual bool PlatformImplAvailable() = 0;
// Some platforms may provide a built-in TTS extension. Returns true
// if the extension was not previously loaded and is now loading, and
// false if it's already loaded or if there's no extension to load.
// Will call TtsController::RetrySpeakingQueuedUtterances when
// the extension finishes loading.
virtual bool LoadBuiltInTtsExtension(
content::BrowserContext* browser_context);
// Speak the given utterance with the given parameters if possible,
// and return true on success. Utterance will always be nonempty.
// If rate, pitch, or volume are -1.0, they will be ignored.
//
// The TtsController will only try to speak one utterance at
// a time. If it wants to interrupt speech, it will always call Stop
// before speaking again.
virtual bool Speak(
int utterance_id,
const std::string& utterance,
const std::string& lang,
const VoiceData& voice,
const UtteranceContinuousParameters& params) = 0;
// Stop speaking immediately and return true on success.
virtual bool StopSpeaking() = 0;
// Returns whether any speech is on going.
virtual bool IsSpeaking() = 0;
// Append information about voices provided by this platform implementation
// to |out_voices|.
virtual void GetVoices(std::vector<VoiceData>* out_voices) = 0;
// Pause the current utterance, if any, until a call to Resume,
// Speak, or StopSpeaking.
virtual void Pause() = 0;
// Resume speaking the current utterance, if it was paused.
virtual void Resume() = 0;
// Allows the platform to monitor speech commands and the voices used
// for each one.
virtual void WillSpeakUtteranceWithVoice(const Utterance* utterance,
const VoiceData& voice_data);
virtual std::string error();
virtual void clear_error();
virtual void set_error(const std::string& error);
protected:
TtsPlatformImpl() {}
// On some platforms this may be a leaky singleton - do not rely on the
// destructor being called! http://crbug.com/122026
virtual ~TtsPlatformImpl() {}
std::string error_;
DISALLOW_COPY_AND_ASSIGN(TtsPlatformImpl);
};
#endif // CHROME_BROWSER_SPEECH_TTS_PLATFORM_H_
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