/* * 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 } } }