129 lines
4.1 KiB
JavaScript
129 lines
4.1 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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* CacheMap
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* TextToSpeechAudio
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*/
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class AudioSystem {
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constructor({getAudioInfo, cacheSize=32}) {
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this._cache = new CacheMap(cacheSize);
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this._getAudioInfo = getAudioInfo;
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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 (typeof speechSynthesis === 'undefined') { return; }
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const eventListeners = new EventListenerCollection();
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const onVoicesChanged = () => { eventListeners.removeAllEventListeners(); };
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eventListeners.addEventListener(speechSynthesis, 'voiceschanged', onVoicesChanged, false);
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}
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async createDefinitionAudio(sources, expression, reading, details) {
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const key = [expression, reading];
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const cacheValue = this._cache.get(key);
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if (typeof cacheValue !== 'undefined') {
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const {audio, source} = cacheValue;
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const index = sources.indexOf(source);
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if (index >= 0) {
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return {audio, index};
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}
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}
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for (let i = 0, ii = sources.length; i < ii; ++i) {
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const source = sources[i];
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const info = await this._getAudioInfo(source, expression, reading, details);
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if (info === null) { continue; }
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let audio;
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try {
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switch (info.type) {
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case 'url':
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{
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const {details: {url}} = info;
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audio = await this.createAudio(url);
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}
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break;
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case 'tts':
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{
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const {details: {text, voice}} = info;
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audio = this.createTextToSpeechAudio(text, voice);
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}
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break;
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default:
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throw new Error(`Unsupported type: ${info.type}`);
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}
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} catch (e) {
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continue;
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}
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this._cache.set(key, {audio, source});
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return {audio, index: i};
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}
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throw new Error('Could not create audio');
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}
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createAudio(url) {
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return new Promise((resolve, reject) => {
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const audio = new Audio(url);
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audio.addEventListener('loadeddata', () => {
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if (!this._isAudioValid(audio)) {
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reject(new Error('Could not retrieve audio'));
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} else {
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resolve(audio);
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}
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});
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audio.addEventListener('error', () => reject(audio.error));
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});
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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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_isAudioValid(audio) {
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const duration = audio.duration;
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return (
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duration !== 5.694694 && // jpod101 invalid audio (Chrome)
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duration !== 5.720718 // jpod101 invalid audio (Firefox)
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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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