/* * Copyright (C) 2019-2020 Alex Yatskov <alex@foosoft.net> * Author: Alex Yatskov <alex@foosoft.net> * * 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/>. */ /*global apiAudioGetUrl*/ class TextToSpeechAudio { constructor(text, voice) { this.text = text; this.voice = voice; this._utterance = null; this._volume = 1; } get currentTime() { return 0; } set currentTime(value) { // NOP } get volume() { return this._volume; } set volume(value) { this._volume = value; if (this._utterance !== null) { this._utterance.volume = value; } } play() { try { if (this._utterance === null) { this._utterance = new SpeechSynthesisUtterance(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 } } pause() { try { speechSynthesis.cancel(); } catch (e) { // NOP } } static createFromUri(ttsUri) { const m = /^tts:[^#?]*\?([^#]*)/.exec(ttsUri); if (m === null) { return null; } const searchParameters = new URLSearchParams(m[1]); const text = searchParameters.get('text'); let voice = searchParameters.get('voice'); if (text === null || voice === null) { return null; } voice = audioGetTextToSpeechVoice(voice); if (voice === null) { return null; } return new TextToSpeechAudio(text, voice); } } function audioGetFromUrl(url, willDownload) { const tts = TextToSpeechAudio.createFromUri(url); if (tts !== null) { if (willDownload) { throw new Error('AnkiConnect does not support downloading text-to-speech audio.'); } return Promise.resolve(tts); } return new Promise((resolve, reject) => { const audio = new Audio(url); audio.addEventListener('loadeddata', () => { if (audio.duration === 5.694694 || audio.duration === 5.720718) { // Hardcoded values for invalid audio reject(new Error('Could not retrieve audio')); } else { resolve(audio); } }); audio.addEventListener('error', () => reject(audio.error)); }); } async function audioGetFromSources(expression, sources, optionsContext, willDownload, cache=null) { const key = `${expression.expression}:${expression.reading}`; if (cache !== null) { const cacheValue = cache.get(expression); if (typeof cacheValue !== 'undefined') { return cacheValue; } } for (let i = 0, ii = sources.length; i < ii; ++i) { const source = sources[i]; const url = await apiAudioGetUrl(expression, source, optionsContext); if (url === null) { continue; } try { let audio = await audioGetFromUrl(url, willDownload); if (willDownload) { // AnkiConnect handles downloading URLs into cards audio = null; } const result = {audio, url, source}; if (cache !== null) { cache.set(key, result); } return result; } catch (e) { // NOP } } return {audio: null, url: null, source: null}; } function audioGetTextToSpeechVoice(voiceURI) { try { for (const voice of speechSynthesis.getVoices()) { if (voice.voiceURI === voiceURI) { return voice; } } } catch (e) { // NOP } return null; } function audioPrepareTextToSpeech(options) { if ( audioPrepareTextToSpeech.state || !options.audio.textToSpeechVoice || !( options.audio.sources.includes('text-to-speech') || options.audio.sources.includes('text-to-speech-reading') ) ) { // Text-to-speech not in use. return; } // Chrome needs this value called once before it will become populated. // The first call will return an empty list. audioPrepareTextToSpeech.state = true; try { speechSynthesis.getVoices(); } catch (e) { // NOP } } audioPrepareTextToSpeech.state = false;