Yomichan is an ongoing community project. It really does take a village, and everyone who contributes code owns a part of it :)
185 lines
5.5 KiB
JavaScript
185 lines
5.5 KiB
JavaScript
/*
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* Copyright (C) 2019-2020 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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class TextToSpeechAudio {
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constructor(text, voice) {
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this.text = text;
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this.voice = voice;
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this._utterance = null;
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this._volume = 1;
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}
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get currentTime() {
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return 0;
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}
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set currentTime(value) {
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// NOP
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}
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get volume() {
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return this._volume;
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}
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set volume(value) {
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this._volume = value;
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if (this._utterance !== null) {
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this._utterance.volume = value;
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}
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}
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play() {
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try {
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if (this._utterance === null) {
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this._utterance = new SpeechSynthesisUtterance(this.text || '');
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this._utterance.lang = 'ja-JP';
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this._utterance.volume = this._volume;
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this._utterance.voice = this.voice;
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}
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speechSynthesis.cancel();
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speechSynthesis.speak(this._utterance);
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} catch (e) {
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// NOP
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}
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}
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pause() {
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try {
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speechSynthesis.cancel();
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} catch (e) {
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// NOP
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}
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}
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}
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class AudioSystem {
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constructor({getAudioUri}) {
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this._cache = new Map();
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this._cacheSizeMaximum = 32;
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this._getAudioUri = getAudioUri;
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if (typeof speechSynthesis !== 'undefined') {
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// speechSynthesis.getVoices() will not be populated unless some API call is made.
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speechSynthesis.addEventListener('voiceschanged', this._onVoicesChanged.bind(this));
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}
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}
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async getDefinitionAudio(definition, sources, details) {
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const key = `${definition.expression}:${definition.reading}`;
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const cacheValue = this._cache.get(definition);
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if (typeof cacheValue !== 'undefined') {
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const {audio, uri, source} = cacheValue;
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return {audio, uri, source};
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}
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for (const source of sources) {
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const uri = await this._getAudioUri(definition, source, details);
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if (uri === null) { continue; }
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try {
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const audio = await this._createAudio(uri, details);
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this._cacheCheck();
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this._cache.set(key, {audio, uri, source});
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return {audio, uri, source};
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} catch (e) {
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// NOP
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}
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}
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throw new Error('Could not create 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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_onVoicesChanged() {
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// NOP
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}
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async _createAudio(uri, details) {
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const ttsParameters = this._getTextToSpeechParameters(uri);
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if (ttsParameters !== null) {
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if (typeof details === 'object' && details !== null) {
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if (details.tts === false) {
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throw new Error('Text-to-speech not permitted');
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}
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}
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return this.createTextToSpeechAudio(ttsParameters);
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}
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return await this._createAudioFromUrl(uri);
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}
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_createAudioFromUrl(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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const duration = audio.duration;
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if (duration === 5.694694 || duration === 5.720718) {
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// Hardcoded values for invalid 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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_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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_getTextToSpeechParameters(uri) {
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const m = /^tts:[^#?]*\?([^#]*)/.exec(uri);
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if (m === null) { return null; }
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const searchParameters = new URLSearchParams(m[1]);
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const text = searchParameters.get('text');
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const voiceUri = searchParameters.get('voice');
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return (text !== null && voiceUri !== null ? {text, voiceUri} : null);
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}
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_cacheCheck() {
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const removeCount = this._cache.size - this._cacheSizeMaximum;
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if (removeCount <= 0) { return; }
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const removeKeys = [];
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for (const key of this._cache.keys()) {
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removeKeys.push(key);
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if (removeKeys.length >= removeCount) { break; }
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}
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for (const key of removeKeys) {
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this._cache.delete(key);
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}
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}
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}
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