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/*
* Copyright (C) 2019 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 <http://www.gnu.org/licenses/>.
*/
function audioGetFromUrl(url) {
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, download, cache=null) {
const key = `${expression.expression}:${expression.reading}`;
if (cache !== null && cache.hasOwnProperty(expression)) {
return cache[key];
}
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 {
const audio = download ? null : await audioGetFromUrl(url);
const result = {audio, url, source};
if (cache !== null) {
cache[key] = result;
}
return result;
} catch (e) {
// NOP
}
}
return {audio: null, source: null};
}
function audioGetTextToSpeechVoice(voiceURI) {
try {
for (const voice of speechSynthesis.getVoices()) {
if (voice.voiceURI === voiceURI) {
return voice;
}
}
} catch (e) {
// NOP
}
return null;
}
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