103 lines
3.0 KiB
JavaScript
103 lines
3.0 KiB
JavaScript
/*
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* Copyright (C) 2019-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
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* TextToSpeechAudio
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*/
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class AudioSystem extends EventDispatcher {
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constructor() {
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super();
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this._fallbackAudio = null;
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}
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prepare() {
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// speechSynthesis.getVoices() will not be populated unless some API call is made.
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if (
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typeof speechSynthesis !== 'undefined' &&
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typeof speechSynthesis.addEventListener === 'function'
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) {
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speechSynthesis.addEventListener('voiceschanged', this._onVoicesChanged.bind(this), false);
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}
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}
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getFallbackAudio() {
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if (this._fallbackAudio === null) {
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this._fallbackAudio = new Audio('/data/audio/button.mp3');
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}
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return this._fallbackAudio;
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}
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async createAudio(url, sourceType) {
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const audio = new Audio(url);
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await this._waitForData(audio);
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if (!this._isAudioValid(audio, sourceType)) {
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throw new Error('Could not retrieve audio');
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}
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return audio;
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}
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createTextToSpeechAudio(text, voiceUri) {
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const voice = this._getTextToSpeechVoiceFromVoiceUri(voiceUri);
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if (voice === null) {
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throw new Error('Invalid text-to-speech voice');
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}
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return new TextToSpeechAudio(text, voice);
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}
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// Private
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_onVoicesChanged(e) {
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this.trigger('voiceschanged', e);
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}
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_waitForData(audio) {
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return new Promise((resolve, reject) => {
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audio.addEventListener('loadeddata', () => resolve());
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audio.addEventListener('error', () => reject(audio.error));
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});
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}
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_isAudioValid(audio, sourceType) {
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switch (sourceType) {
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case 'jpod101':
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{
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const duration = audio.duration;
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return (
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duration !== 5.694694 && // Invalid audio (Chrome)
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duration !== 5.720718 // Invalid audio (Firefox)
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);
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}
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default:
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return true;
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}
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}
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_getTextToSpeechVoiceFromVoiceUri(voiceUri) {
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try {
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for (const voice of speechSynthesis.getVoices()) {
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if (voice.voiceURI === voiceUri) {
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return voice;
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}
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}
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} catch (e) {
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// NOP
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}
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return null;
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}
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}
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