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-rw-r--r--ext/js/media/audio-system.js94
-rw-r--r--ext/js/media/media-loader.js107
-rw-r--r--ext/js/media/text-to-speech-audio.js68
3 files changed, 269 insertions, 0 deletions
diff --git a/ext/js/media/audio-system.js b/ext/js/media/audio-system.js
new file mode 100644
index 00000000..cf63511f
--- /dev/null
+++ b/ext/js/media/audio-system.js
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2019-2021 Yomichan Authors
+ *
+ * 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
+ * TextToSpeechAudio
+ */
+
+class AudioSystem {
+ constructor() {
+ this._fallbackAudio = null;
+ }
+
+ prepare() {
+ // speechSynthesis.getVoices() will not be populated unless some API call is made.
+ if (typeof speechSynthesis === 'undefined') { return; }
+
+ const eventListeners = new EventListenerCollection();
+ const onVoicesChanged = () => { eventListeners.removeAllEventListeners(); };
+ eventListeners.addEventListener(speechSynthesis, 'voiceschanged', onVoicesChanged, false);
+ }
+
+ getFallbackAudio() {
+ if (this._fallbackAudio === null) {
+ this._fallbackAudio = new Audio('/data/audio/button.mp3');
+ }
+ return this._fallbackAudio;
+ }
+
+ createAudio(url, source) {
+ return new Promise((resolve, reject) => {
+ const audio = new Audio(url);
+ audio.addEventListener('loadeddata', () => {
+ if (!this._isAudioValid(audio, source)) {
+ reject(new Error('Could not retrieve audio'));
+ } else {
+ resolve(audio);
+ }
+ });
+ audio.addEventListener('error', () => reject(audio.error));
+ });
+ }
+
+ createTextToSpeechAudio(text, voiceUri) {
+ const voice = this._getTextToSpeechVoiceFromVoiceUri(voiceUri);
+ if (voice === null) {
+ throw new Error('Invalid text-to-speech voice');
+ }
+ return new TextToSpeechAudio(text, voice);
+ }
+
+ // Private
+
+ _isAudioValid(audio, source) {
+ switch (source) {
+ case 'jpod101':
+ {
+ const duration = audio.duration;
+ return (
+ duration !== 5.694694 && // Invalid audio (Chrome)
+ duration !== 5.720718 // Invalid audio (Firefox)
+ );
+ }
+ default:
+ return true;
+ }
+ }
+
+ _getTextToSpeechVoiceFromVoiceUri(voiceUri) {
+ try {
+ for (const voice of speechSynthesis.getVoices()) {
+ if (voice.voiceURI === voiceUri) {
+ return voice;
+ }
+ }
+ } catch (e) {
+ // NOP
+ }
+ return null;
+ }
+}
diff --git a/ext/js/media/media-loader.js b/ext/js/media/media-loader.js
new file mode 100644
index 00000000..5974e31a
--- /dev/null
+++ b/ext/js/media/media-loader.js
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2020-2021 Yomichan Authors
+ *
+ * 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
+ * api
+ */
+
+class MediaLoader {
+ constructor() {
+ this._token = {};
+ this._mediaCache = new Map();
+ this._loadMediaData = [];
+ }
+
+ async loadMedia(path, dictionaryName, onLoad, onUnload) {
+ const token = this._token;
+ const data = {onUnload, loaded: false};
+
+ this._loadMediaData.push(data);
+
+ const media = await this.getMedia(path, dictionaryName);
+ if (token !== this._token) { return; }
+
+ onLoad(media.url);
+ data.loaded = true;
+ }
+
+ unloadAll() {
+ for (const {onUnload, loaded} of this._loadMediaData) {
+ if (typeof onUnload === 'function') {
+ onUnload(loaded);
+ }
+ }
+ this._loadMediaData = [];
+
+ for (const map of this._mediaCache.values()) {
+ for (const {url} of map.values()) {
+ if (url !== null) {
+ URL.revokeObjectURL(url);
+ }
+ }
+ }
+ this._mediaCache.clear();
+
+ this._token = {};
+ }
+
+ async getMedia(path, dictionaryName) {
+ let cachedData;
+ let dictionaryCache = this._mediaCache.get(dictionaryName);
+ if (typeof dictionaryCache !== 'undefined') {
+ cachedData = dictionaryCache.get(path);
+ } else {
+ dictionaryCache = new Map();
+ this._mediaCache.set(dictionaryName, dictionaryCache);
+ }
+
+ if (typeof cachedData === 'undefined') {
+ cachedData = {
+ promise: null,
+ data: null,
+ url: null
+ };
+ dictionaryCache.set(path, cachedData);
+ cachedData.promise = this._getMediaData(path, dictionaryName, cachedData);
+ }
+
+ return cachedData.promise;
+ }
+
+ async _getMediaData(path, dictionaryName, cachedData) {
+ const token = this._token;
+ const data = (await api.getMedia([{path, dictionaryName}]))[0];
+ if (token === this._token && data !== null) {
+ const contentArrayBuffer = this._base64ToArrayBuffer(data.content);
+ const blob = new Blob([contentArrayBuffer], {type: data.mediaType});
+ const url = URL.createObjectURL(blob);
+ cachedData.data = data;
+ cachedData.url = url;
+ }
+ return cachedData;
+ }
+
+ _base64ToArrayBuffer(content) {
+ const binaryContent = window.atob(content);
+ const length = binaryContent.length;
+ const array = new Uint8Array(length);
+ for (let i = 0; i < length; ++i) {
+ array[i] = binaryContent.charCodeAt(i);
+ }
+ return array.buffer;
+ }
+}
diff --git a/ext/js/media/text-to-speech-audio.js b/ext/js/media/text-to-speech-audio.js
new file mode 100644
index 00000000..a32916f4
--- /dev/null
+++ b/ext/js/media/text-to-speech-audio.js
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2020-2021 Yomichan Authors
+ *
+ * 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/>.
+ */
+
+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;
+ }
+ }
+
+ async play() {
+ try {
+ if (this._utterance === null) {
+ this._utterance = new SpeechSynthesisUtterance(typeof this._text === 'string' ? 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
+ }
+ }
+}