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/*
* Copyright (C) 2023 Yomitan Authors
* Copyright (C) 2020-2022 Yomichan Authors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
export class TextToSpeechAudio {
/**
* @param {string} text
* @param {SpeechSynthesisVoice} voice
*/
constructor(text, voice) {
/** @type {string} */
this._text = text;
/** @type {SpeechSynthesisVoice} */
this._voice = voice;
/** @type {?SpeechSynthesisUtterance} */
this._utterance = null;
/** @type {number} */
this._volume = 1;
}
/** @type {number} */
get currentTime() {
return 0;
}
set currentTime(value) {
// NOP
}
/** @type {number} */
get volume() {
return this._volume;
}
set volume(value) {
this._volume = value;
if (this._utterance !== null) {
this._utterance.volume = value;
}
}
/**
* @returns {Promise<void>}
*/
async play() {
try {
if (this._utterance === null) {
this._utterance = new SpeechSynthesisUtterance(typeof this._text === 'string' ? this._text : '');
this._utterance.lang = 'ja-JP';
this._utterance.volume = this._volume;
this._utterance.voice = this._voice;
}
speechSynthesis.cancel();
speechSynthesis.speak(this._utterance);
} catch (e) {
// NOP
}
}
/**
* @returns {void}
*/
pause() {
try {
speechSynthesis.cancel();
} catch (e) {
// NOP
}
}
}
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