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vendor/yomitan/js/media/text-to-speech-audio.js

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+/*
+ * Copyright (C) 2023-2025  Yomitan Authors
+ * Copyright (C) 2020-2022  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/>.
+ */
+
+export class TextToSpeechAudio {
+    /**
+     * @param {string} text
+     * @param {SpeechSynthesisVoice} voice
+     */
+    constructor(text, voice) {
+        /** @type {string} */
+        this._text = text;
+        /** @type {SpeechSynthesisVoice} */
+        this._voice = voice;
+        /** @type {?SpeechSynthesisUtterance} */
+        this._utterance = null;
+        /** @type {number} */
+        this._volume = 1;
+    }
+
+    /** @type {number} */
+    get currentTime() {
+        return 0;
+    }
+
+    set currentTime(value) {
+        // NOP
+    }
+
+    /** @type {number} */
+    get volume() {
+        return this._volume;
+    }
+
+    set volume(value) {
+        this._volume = value;
+        if (this._utterance !== null) {
+            this._utterance.volume = value;
+        }
+    }
+
+    /**
+     * @returns {Promise<void>}
+     */
+    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
+        }
+    }
+
+    /**
+     * @returns {void}
+     */
+    pause() {
+        try {
+            speechSynthesis.cancel();
+        } catch (e) {
+            // NOP
+        }
+    }
+}