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-rw-r--r--ext/mixed/js/audio.js60
1 files changed, 60 insertions, 0 deletions
diff --git a/ext/mixed/js/audio.js b/ext/mixed/js/audio.js
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--- /dev/null
+++ b/ext/mixed/js/audio.js
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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, createAudioObject, 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 = createAudioObject ? await audioGetFromUrl(url) : null;
+ const result = {audio, url, source};
+ if (cache !== null) {
+ cache[key] = result;
+ }
+ return result;
+ } catch (e) {
+ // NOP
+ }
+ }
+ return {audio: null, source: null};
+}